com.avaje.ebean

Interface EbeanServer

All Known Subinterfaces:

SpiServer

public interface EbeanServer

Provides the API for fetching and saving beans to a particular DataSource.

Registration with the Ebean Singleton:
When a EbeanServer is constructed it can be registered with the Ebean singleton (see ServerConfig.setRegister(boolean)). The Ebean singleton is essentially a map of EbeanServer's that have been registered with it. The EbeanServer can then be retrieved later via Ebean.getServer(String).

The 'default' EbeanServer
One EbeanServer can be designated as the 'default' or 'primary' EbeanServer (see ServerConfig.setDefaultServer(boolean). Many methods on Ebean such as Ebean.find(Class) etc are actually just a convenient way to call methods on the 'default/primary' EbeanServer. This is handy for applications that use a single DataSource.

There is one EbeanServer per Database (javax.sql.DataSource). One EbeanServer is referred to as the 'default' server and that is the one that Ebean methods such as Ebean.find(Class) use.

Constructing a EbeanServer
EbeanServer's are constructed by the EbeanServerFactory. They can be created programmatically via EbeanServerFactory.create(ServerConfig) or they can be automatically constructed on demand using configuration information in the ebean.properties file.

Example: Get a EbeanServer

// Get access to the Human Resources EbeanServer/Database
EbeanServer hrServer = Ebean.getServer("HR");


// fetch contact 3 from the HR database Contact contact =
hrServer.find(Contact.class, new Integer(3));

contact.setStatus("INACTIVE"); ...

// save the contact back to the HR database hrServer.save(contact);

EbeanServer has more API than Ebean
EbeanServer provides additional API compared with Ebean. For example it provides more control over the use of Transactions that is not available in the Ebean API.

External Transactions: If you wanted to use transactions created externally to eBean then EbeanServer provides additional methods where you can explicitly pass a transaction (that can be created externally).

Bypass ThreadLocal Mechanism: If you want to bypass the built in ThreadLocal transaction management you can use the createTransaction() method. Example: a single thread requires more than one transaction.

See Also:

Ebean, EbeanServerFactory, ServerConfig

Method Summary

Modifier and Type	Method and Description
Transaction	beginTransaction() Start a transaction with 'REQUIRED' semantics.
Transaction	beginTransaction(TxIsolation isolation) Start a transaction additionally specifying the isolation level.
Transaction	beginTransaction(TxScope scope) Start a transaction typically specifying REQUIRES_NEW or REQUIRED semantics.
void	commitTransaction() Commit the current transaction.
CallableSql	createCallableSql(String callableSql) Create a CallableSql to execute a given stored procedure.
<T> CsvReader<T>	createCsvReader(Class<T> beanType) Create a CsvReader for a given beanType.
<T> T	createEntityBean(Class<T> type) Create a new instance of T that is an EntityBean.
<T> Query<T>	createNamedQuery(Class<T> beanType, String namedQuery) Return a named Query that will have defined fetch paths, predicates etc.
SqlQuery	createNamedSqlQuery(String namedQuery) Create a named sql query.
SqlUpdate	createNamedSqlUpdate(String namedQuery) Create a named sql update.
<T> Update<T>	createNamedUpdate(Class<T> beanType, String namedUpdate) Create a named orm update.
<T> Query<T>	createQuery(Class<T> beanType) Create a query for an entity bean and synonym for find(Class).
<T> Query<T>	createQuery(Class<T> beanType, String query) Create a query using the query language.
SqlQuery	createSqlQuery(String sql) Create a SqlQuery for executing native sql query statements.
SqlUpdate	createSqlUpdate(String sql) Create a sql update for executing native dml statements.
Transaction	createTransaction() Create a new transaction that is not held in TransactionThreadLocal.
Transaction	createTransaction(TxIsolation isolation) Create a new transaction additionally specifying the isolation level.
<T> Update<T>	createUpdate(Class<T> beanType, String ormUpdate) Create a orm update where you will supply the insert/update or delete statement (rather than using a named one that is already defined using the @NamedUpdates annotation).
Transaction	currentTransaction() Returns the current transaction or null if there is no current transaction in scope.
int	delete(Class<?> beanType, Object id) Delete the bean given its type and id.
int	delete(Class<?> beanType, Object id, Transaction transaction) Delete the bean given its type and id with an explicit transaction.
void	delete(Object bean) Delete the bean.
void	delete(Object bean, Transaction transaction) Delete the bean with an explicit transaction.
<T> int	delete(Query<T> query, Transaction transaction) Execute as a delete query deleting the 'root level' beans that match the predicates in the query.
void	deleteAll(Class<?> beanType, Collection<?> ids) Delete several beans given their type and id values.
void	deleteAll(Class<?> beanType, Collection<?> ids, Transaction transaction) Delete several beans given their type and id values with an explicit transaction.
int	deleteAll(Collection<?> beans) Delete all the beans in the collection.
int	deleteAll(Collection<?> beans, Transaction transaction) Delete all the beans in the collection using an explicit transaction.
int	deleteManyToManyAssociations(Object ownerBean, String propertyName) Delete the associations (from the intersection table) of a ManyToMany given the owner bean and the propertyName of the ManyToMany collection.
int	deleteManyToManyAssociations(Object ownerBean, String propertyName, Transaction transaction) Delete the associations (from the intersection table) of a ManyToMany given the owner bean and the propertyName of the ManyToMany collection.
Map<String,ValuePair>	diff(Object newBean, Object oldBean) Return a map of the differences between two objects of the same type.
void	endTransaction() If the current transaction has already been committed do nothing otherwise rollback the transaction.
int	execute(CallableSql callableSql) For making calls to stored procedures.
int	execute(CallableSql callableSql, Transaction transaction) Execute explicitly passing a transaction.
int	execute(SqlUpdate sqlUpdate) Execute a Sql Update Delete or Insert statement.
int	execute(SqlUpdate updSql, Transaction transaction) Execute explicitly passing a transaction.
<T> T	execute(TxCallable<T> callable) Execute a TxCallable in a Transaction with the default scope.
void	execute(TxRunnable runnable) Execute a TxRunnable in a Transaction with the default scope.
<T> T	execute(TxScope scope, TxCallable<T> callable) Execute a TxCallable in a Transaction with an explicit scope.
void	execute(TxScope scope, TxRunnable runnable) Execute a TxRunnable in a Transaction with an explicit scope.
int	execute(Update<?> update) Execute a ORM insert update or delete statement using the current transaction.
int	execute(Update<?> update, Transaction transaction) Execute a ORM insert update or delete statement with an explicit transaction.
void	externalModification(String tableName, boolean inserted, boolean updated, boolean deleted) Inform Ebean that tables have been modified externally.
<T> Filter<T>	filter(Class<T> beanType) Create a filter for sorting and filtering lists of entities locally without going back to the database.
<T> Query<T>	find(Class<T> beanType) Create a query for a type of entity bean.
<T> T	find(Class<T> beanType, Object id) Find a bean using its unique id.
<T> T	find(Class<T> beanType, Object id, Transaction transaction) Find a entity bean with an explicit transaction.
<T> void	findEach(Query<T> query, QueryEachConsumer<T> consumer, Transaction transaction) Execute the query visiting the each bean one at a time.
<T> void	findEachWhile(Query<T> query, QueryEachWhileConsumer<T> consumer, Transaction transaction) Execute the query visiting the each bean one at a time.
<T> FutureIds<T>	findFutureIds(Query<T> query, Transaction transaction) Execute find Id's query in a background thread.
<T> FutureList<T>	findFutureList(Query<T> query, Transaction transaction) Execute find list query in a background thread returning a FutureList object.
SqlFutureList	findFutureList(SqlQuery query, Transaction transaction) Execute find list SQL query in a background thread.
<T> FutureRowCount<T>	findFutureRowCount(Query<T> query, Transaction transaction) Execute find row count query in a background thread.
<T> List<Object>	findIds(Query<T> query, Transaction transaction) Return the Id values of the query as a List.
<T> QueryIterator<T>	findIterate(Query<T> query, Transaction transaction) Return a QueryIterator for the query.
<T> List<T>	findList(Query<T> query, Transaction transaction) Execute a query returning a list of beans.
List<SqlRow>	findList(SqlQuery query, Transaction transaction) Execute the sql query returning a list of MapBean.
<T> Map<?,T>	findMap(Query<T> query, Transaction transaction) Execute the query returning the entity beans in a Map.
Map<?,SqlRow>	findMap(SqlQuery query, Transaction transaction) Execute the sql query returning a map of MapBean.
<T> PagedList<T>	findPagedList(Query<T> query, Transaction transaction, int pageIndex, int pageSize) Return a PagedList for this query.
<T> int	findRowCount(Query<T> query, Transaction transaction) Return the number of 'top level' or 'root' entities this query should return.
<T> Set<T>	findSet(Query<T> query, Transaction transaction) Execute the query returning a set of entity beans.
Set<SqlRow>	findSet(SqlQuery query, Transaction transaction) Execute the sql query returning a set of MapBean.
<T> T	findUnique(Query<T> query, Transaction transaction) Execute the query returning at most one entity bean.
SqlRow	findUnique(SqlQuery query, Transaction transaction) Execute the sql query returning a single MapBean or null.
<T> List<Version<T>>	findVersions(Query<T> query, Transaction transaction) Return versions of a @History entity bean.
AutoTune	getAutoTune() Return AutoTune which is used to control the AutoTune service at runtime.
BackgroundExecutor	getBackgroundExecutor() Return the BackgroundExecutor service for asynchronous processing of queries.
Object	getBeanId(Object bean) Return the value of the Id property for a given bean.
BeanState	getBeanState(Object bean) Return the BeanState for a given entity bean.
ExpressionFactory	getExpressionFactory() Return the ExpressionFactory for this server.
MetaInfoManager	getMetaInfoManager() Return the MetaInfoManager which is used to get meta data from the EbeanServer such as query execution statistics.
String	getName() Return the name.
SpiServer	getPluginApi() Return the extended API intended for use by plugins.
<T> T	getReference(Class<T> beanType, Object id) Get a reference object.
ServerCacheManager	getServerCacheManager() Return the manager of the server cache ("L2" cache).
void	insert(Object bean) Insert the bean.
void	insert(Object bean, Transaction transaction) Insert the bean with a transaction.
void	insertAll(Collection<?> beans) Insert a collection of beans.
void	insertAll(Collection<?> beans, Transaction transaction) Insert a collection of beans with an explicit transaction.
JsonContext	json() Return the JsonContext for reading/writing JSON.
void	markAsDirty(Object bean) Marks the entity bean as dirty.
Object	nextId(Class<?> beanType) Return the next unique identity value for a given bean type.
void	refresh(Object bean) Refresh the values of a bean.
void	refreshMany(Object bean, String propertyName) Refresh a many property of an entity bean.
void	register(TransactionCallback transactionCallback) Register a TransactionCallback on the currently active transaction.
void	rollbackTransaction() Rollback the current transaction.
void	runCacheWarming() Run the cache warming queries on all bean types that have one defined.
void	runCacheWarming(Class<?> beanType) Run the cache warming query for a specific bean type.
void	save(Object bean) Either Insert or Update the bean depending on its state.
void	save(Object bean, Transaction transaction) Insert or update a bean with an explicit transaction.
int	saveAll(Collection<?> beans) Save all the beans in the collection.
int	saveAll(Collection<?> beans, Transaction transaction) Save all the beans in the collection with an explicit transaction.
void	saveAssociation(Object ownerBean, String propertyName) Save the associated collection or bean given the property name.
void	saveAssociation(Object ownerBean, String propertyName, Transaction transaction) Save the associated collection or bean given the property name with a specific transaction.
void	saveManyToManyAssociations(Object ownerBean, String propertyName) Save the associations of a ManyToMany given the owner bean and the propertyName of the ManyToMany collection.
void	saveManyToManyAssociations(Object ownerBean, String propertyName, Transaction transaction) Save the associations of a ManyToMany given the owner bean and the propertyName of the ManyToMany collection.
void	shutdown(boolean shutdownDataSource, boolean deregisterDriver) Shutdown the EbeanServer programmatically.
<T> void	sort(List<T> list, String sortByClause) Sort the list in memory using the sortByClause which can contain a comma delimited list of property names and keywords asc, desc, nullsHigh and nullsLow.
void	update(Object bean) Saves the bean using an update.
void	update(Object bean, Transaction transaction) Update a bean additionally specifying a transaction.
void	update(Object bean, Transaction transaction, boolean deleteMissingChildren) Update a bean additionally specifying a transaction and the deleteMissingChildren setting.
void	updateAll(Collection<?> beans) Update a collection of beans.
void	updateAll(Collection<?> beans, Transaction transaction) Update a collection of beans with an explicit transaction.

Method Detail

shutdown

void shutdown(boolean shutdownDataSource,
              boolean deregisterDriver)

Shutdown the EbeanServer programmatically.

This method is not normally required. Ebean registers a shutdown hook and shuts down cleanly.

If the under underlying DataSource is the Ebean implementation then you also have the option of shutting down the DataSource and deregistering the JDBC driver.

Parameters:

shutdownDataSource - if true then shutdown the underlying DataSource if it is the EbeanORM DataSource implementation.

deregisterDriver - if true then deregister the JDBC driver if it is the EbeanORM DataSource implementation.

getAutoTune

AutoTune getAutoTune()

Return AutoTune which is used to control the AutoTune service at runtime.

getName

String getName()

Return the name. This is used with Ebean.getServer(String) to get a EbeanServer that was registered with the Ebean singleton.

getExpressionFactory

ExpressionFactory getExpressionFactory()

Return the ExpressionFactory for this server.

getMetaInfoManager

MetaInfoManager getMetaInfoManager()

Return the MetaInfoManager which is used to get meta data from the EbeanServer such as query execution statistics.

getPluginApi

SpiServer getPluginApi()

Return the extended API intended for use by plugins.

getBeanState

BeanState getBeanState(Object bean)

Return the BeanState for a given entity bean.

This will return null if the bean is not an enhanced entity bean.

getBeanId

Object getBeanId(Object bean)

Return the value of the Id property for a given bean.

diff

Map<String,ValuePair> diff(Object newBean,
                           Object oldBean)

Return a map of the differences between two objects of the same type.

When null is passed in for b, then the 'OldValues' of a is used for the difference comparison.

createEntityBean

<T> T createEntityBean(Class<T> type)

Create a new instance of T that is an EntityBean.

Generally not expected to be useful (now dynamic subclassing support was removed in favour of always using enhancement).

createCsvReader

<T> CsvReader<T> createCsvReader(Class<T> beanType)

Create a CsvReader for a given beanType.

createNamedQuery

<T> Query<T> createNamedQuery(Class<T> beanType,
                              String namedQuery)

Return a named Query that will have defined fetch paths, predicates etc.

The query is created from a statement that will be defined in a deployment orm xml file or NamedQuery annotations. The query will typically already define fetch paths, predicates, order by clauses etc so often you will just need to bind required parameters and then execute the query.

  // example
  Query<Order> query = ebeanServer.createNamedQuery(Order.class, "new.for.customer");
  query.setParameter("customerId", 23);
  List<Order> newOrders = query.findList();

createQuery

<T> Query<T> createQuery(Class<T> beanType,
                         String query)

Create a query using the query language.

Note that you are allowed to add additional clauses using where() as well as use fetch() and setOrderBy() after the query has been created.

Note that this method signature used to map to named queries and that has moved to createNamedQuery(Class, String).

 EbeanServer ebeanServer = ... ;
 String q = "find order fetch details where status = :st";
 
 List<Order> newOrders
       = ebeanServer.createQuery(Order.class, q)
            .setParameter("st", Order.Status.NEW)
            .findList();

Parameters:

query - the object query

createQuery

<T> Query<T> createQuery(Class<T> beanType)

Create a query for an entity bean and synonym for find(Class).

See Also:

find(Class)

find

<T> Query<T> find(Class<T> beanType)

Create a query for a type of entity bean.

You can use the methods on the Query object to specify fetch paths, predicates, order by, limits etc.

You then use findList(), findSet(), findMap() and findUnique() to execute the query and return the collection or bean.

Note that a query executed by Query.findList() Query.findSet() etc will execute against the same EbeanServer from which is was created.

  // Find order 2 specifying explicitly the parts of the object graph to
  // eagerly fetch. In this case eagerly fetch the associated customer,
  // details and details.product.name

  Order order = ebeanServer.find(Order.class)
    .fetch("customer")
    .fetch("details")
    .fetch("detail.product", "name")
    .setId(2)
    .findUnique();

  // find some new orders ... with firstRow/maxRows
  List<Order> orders =
    ebeanServer.find(Order.class)
      .where().eq("status", Order.Status.NEW)
      .setFirstRow(20)
      .setMaxRows(10)
      .findList();

nextId

Object nextId(Class<?> beanType)

Return the next unique identity value for a given bean type.

This will only work when a IdGenerator is on the bean such as for beans that use a DB sequence or UUID.

For DB's supporting getGeneratedKeys and sequences such as Oracle10 you do not need to use this method generally. It is made available for more complex cases where it is useful to get an ID prior to some processing.

filter

<T> Filter<T> filter(Class<T> beanType)

Create a filter for sorting and filtering lists of entities locally without going back to the database.

This produces and returns a new list with the sort and filters applied.

Refer to Filter for an example of its use.

sort

<T> void sort(List<T> list,
              String sortByClause)

Sort the list in memory using the sortByClause which can contain a comma delimited list of property names and keywords asc, desc, nullsHigh and nullsLow.

• asc - ascending order (which is the default)
• desc - Descending order
• nullsHigh - Treat null values as high/large values (which is the default)
• nullsLow- Treat null values as low/very small values

If you leave off any keywords the defaults are ascending order and treating nulls as high values.

Note that the sorting uses a Comparator and Collections.sort(); and does not invoke a DB query.

  // find orders and their customers
  List<Order> list = ebeanServer.find(Order.class)
    .fetch("customer")
    .orderBy("id")
    .findList();

  // sort by customer name ascending, then by order shipDate
  // ... then by the order status descending
  ebeanServer.sort(list, "customer.name, shipDate, status desc");

  // sort by customer name descending (with nulls low)
  // ... then by the order id
  ebeanServer.sort(list, "customer.name desc nullsLow, id");

Parameters:

list - the list of entity beans

sortByClause - the properties to sort the list by

createNamedUpdate

<T> Update<T> createNamedUpdate(Class<T> beanType,
                                String namedUpdate)

Create a named orm update. The update statement is specified via the NamedUpdate annotation.

The orm update differs from the SqlUpdate in that it uses the bean name and bean property names rather than table and column names.

Note that named update statements can be specified in raw sql (with column and table names) or using bean name and bean property names. This can be specified with the isSql flag.

Example named updates:

  package app.data;

  import ...

  @NamedUpdates(value = {
   @NamedUpdate( name = "setTitle",
            isSql = false,
                  notifyCache = false,
                  update = "update topic set title = :title, postCount = :postCount where id = :id"),
          @NamedUpdate( name = "setPostCount",
                  notifyCache = false,
                  update = "update f_topic set post_count = :postCount where id = :id"),
          @NamedUpdate( name = "incrementPostCount",
                  notifyCache = false,
                  isSql = false,
                  update = "update Topic set postCount = postCount + 1 where id = :id") })
  @Entity
  @Table(name = "f_topic")
  public class Topic { ...

Example using a named update:

  Update<Topic> update = ebeanServer.createNamedUpdate(Topic.class, "setPostCount");
  update.setParameter("postCount", 10);
  update.setParameter("id", 3);

  int rows = update.execute();
  System.out.println("rows updated: " + rows);

createUpdate

<T> Update<T> createUpdate(Class<T> beanType,
                           String ormUpdate)

Create a orm update where you will supply the insert/update or delete statement (rather than using a named one that is already defined using the @NamedUpdates annotation).

The orm update differs from the sql update in that it you can use the bean name and bean property names rather than table and column names.

An example:

  // The bean name and properties - "topic","postCount" and "id"

  // will be converted into their associated table and column names
  String updStatement = "update topic set postCount = :pc where id = :id";

  Update<Topic> update = ebeanServer.createUpdate(Topic.class, updStatement);

  update.set("pc", 9);
  update.set("id", 3);

  int rows = update.execute();
  System.out.println("rows updated:" + rows);

createSqlQuery

SqlQuery createSqlQuery(String sql)

Create a SqlQuery for executing native sql query statements.

Note that you can use raw SQL with entity beans, refer to the SqlSelect annotation for examples.

createNamedSqlQuery

SqlQuery createNamedSqlQuery(String namedQuery)

Create a named sql query.

The query statement will be defined in a deployment orm xml file.

Parameters:

namedQuery - the name of the query

createSqlUpdate

SqlUpdate createSqlUpdate(String sql)

Create a sql update for executing native dml statements.

Use this to execute a Insert Update or Delete statement. The statement will be native to the database and contain database table and column names.

See SqlUpdate for example usage.

Where possible it would be expected practice to put the statement in a orm xml file (named update) and use createNamedSqlUpdate(String) .

createCallableSql

CallableSql createCallableSql(String callableSql)

Create a CallableSql to execute a given stored procedure.

createNamedSqlUpdate

SqlUpdate createNamedSqlUpdate(String namedQuery)

Create a named sql update.

The statement (an Insert Update or Delete statement) will be defined in a deployment orm xml file.

  // Use a namedQuery
  UpdateSql update = Ebean.createNamedSqlUpdate("update.topic.count");

  update.setParameter("count", 1);
  update.setParameter("topicId", 50);

  int modifiedCount = update.execute();

register

void register(TransactionCallback transactionCallback)
       throws javax.persistence.PersistenceException

Register a TransactionCallback on the currently active transaction.

If there is no currently active transaction then a PersistenceException is thrown.

Parameters:

transactionCallback - The transaction callback to be registered with the current transaction.

Throws:

javax.persistence.PersistenceException - If there is no currently active transaction

createTransaction

Transaction createTransaction()

Create a new transaction that is not held in TransactionThreadLocal.

You will want to do this if you want multiple Transactions in a single thread or generally use transactions outside of the TransactionThreadLocal management.

createTransaction

Transaction createTransaction(TxIsolation isolation)

Create a new transaction additionally specifying the isolation level.

Note that this transaction is NOT stored in a thread local.

beginTransaction

Transaction beginTransaction()

Start a transaction with 'REQUIRED' semantics.

With REQUIRED semantics if an active transaction already exists that transaction will be used.

The transaction is stored in a ThreadLocal variable and typically you only need to use the returned Transaction IF you wish to do things like use batch mode, change the transaction isolation level, use savepoints or log comments to the transaction log.

Example of using a transaction to span multiple calls to find(), save() etc.

   // start a transaction (stored in a ThreadLocal)
   ebeanServer.beginTransaction();
   try {
            Order order = ebeanServer.find(Order.class,10);

            ebeanServer.save(order);

            ebeanServer.commitTransaction();

   } finally {
            // rollback if we didn't commit
            // i.e. an exception occurred before commitTransaction().
            ebeanServer.endTransaction();
   }

Transaction options:

    Transaction txn = ebeanServer.beginTransaction();
    try {
      // explicitly turn on/off JDBC batch use
      txn.setBatchMode(true);
      txn.setBatchSize(50);

      // control flushing when mixing save and queries
      txn.setBatchFlushOnQuery(false);

      // turn off persist cascade if needed
      txn.setPersistCascade(false);

      // for large batch insert processing when we do not
      // ... need the generatedKeys, don't get them
      txn.setBatchGetGeneratedKeys(false);

      // explicitly flush the JDBC batch buffer
      txn.flushBatch();

      ...

      txn.commit();

   } finally {
      // rollback if necessary
      txn.end();
   }

If you want to externalise the transaction management then you use createTransaction() and pass the transaction around to the various methods on EbeanServer yourself.

beginTransaction

Transaction beginTransaction(TxIsolation isolation)

Start a transaction additionally specifying the isolation level.

beginTransaction

Transaction beginTransaction(TxScope scope)

Start a transaction typically specifying REQUIRES_NEW or REQUIRED semantics.

Note that this provides an try finally alternative to using execute(TxScope, TxCallable) or execute(TxScope, TxRunnable).

REQUIRES_NEW example:

// Start a new transaction. If there is a current transaction
// suspend it until this transaction ends
Transaction txn = server.beginTransaction(TxScope.requiresNew());
try {

  ...

  // commit the transaction
  txn.commit();

} finally {
  // end this transaction which:
  //  A) will rollback transaction if it has not been committed already
  //  B) will restore a previously suspended transaction
  txn.end();
}

REQUIRED example:

// start a new transaction if there is not a current transaction
Transaction txn = server.beginTransaction(TxScope.required());
try {

  ...

  // commit the transaction if it was created or
  // do nothing if there was already a current transaction
  txn.commit();

} finally {
  // end this transaction which will rollback the transaction
  // if it was created for this try finally scope and has not
  // already been committed
  txn.end();
}

currentTransaction

Transaction currentTransaction()

Returns the current transaction or null if there is no current transaction in scope.

commitTransaction

void commitTransaction()

Commit the current transaction.

rollbackTransaction

void rollbackTransaction()

Rollback the current transaction.

endTransaction

void endTransaction()

If the current transaction has already been committed do nothing otherwise rollback the transaction.

Useful to put in a finally block to ensure the transaction is ended, rather than a rollbackTransaction() in each catch block.

Code example:

  ebeanServer.beginTransaction();
  try {
    // do some fetching and or persisting ...

    // commit at the end
    ebeanServer.commitTransaction();

  } finally {
    // if commit didn't occur then rollback the transaction
    ebeanServer.endTransaction();
  }

refresh

void refresh(Object bean)

Refresh the values of a bean.

Note that this resets OneToMany and ManyToMany properties so that if they are accessed a lazy load will refresh the many property.

refreshMany

void refreshMany(Object bean,
                 String propertyName)

Refresh a many property of an entity bean.

Parameters:

bean - the entity bean containing the 'many' property

propertyName - the 'many' property to be refreshed

find

<T> T find(Class<T> beanType,
           Object id)

Find a bean using its unique id.

  // Fetch order 1
  Order order = ebeanServer.find(Order.class, 1);

If you want more control over the query then you can use createQuery() and Query.findUnique();

  // ... additionally fetching customer, customer shipping address,
  // order details, and the product associated with each order detail.
  // note: only product id and name is fetch (its a "partial object").
  // note: all other objects use "*" and have all their properties fetched.

  Query<Order> query = ebeanServer.find(Order.class)
    .setId(1)
    .fetch("customer")
    .fetch("customer.shippingAddress")
    .fetch("details")
    .query();

  // fetch associated products but only fetch their product id and name
  query.fetch("details.product", "name");


  Order order = query.findUnique();

  // traverse the object graph...

  Customer customer = order.getCustomer();
  Address shippingAddress = customer.getShippingAddress();
  List<OrderDetail> details = order.getDetails();
  OrderDetail detail0 = details.get(0);
  Product product = detail0.getProduct();
  String productName = product.getName();

Parameters:

beanType - the type of entity bean to fetch

id - the id value

getReference

<T> T getReference(Class<T> beanType,
                   Object id)

Get a reference object.

This will not perform a query against the database unless some property other that the id property is accessed.

It is most commonly used to set a 'foreign key' on another bean like:

  Product product = ebeanServer.getReference(Product.class, 1);

  OrderDetail orderDetail = new OrderDetail();
  // set the product 'foreign key'
  orderDetail.setProduct(product);
  orderDetail.setQuantity(42);
  ...

  ebeanServer.save(orderDetail);

Lazy loading characteristics

  Product product = ebeanServer.getReference(Product.class, 1);

  // You can get the id without causing a fetch/lazy load
  Long productId = product.getId();

  // If you try to get any other property a fetch/lazy loading will occur
  // This will cause a query to execute...
  String name = product.getName();

Parameters:

beanType - the type of entity bean

id - the id value

findRowCount

<T> int findRowCount(Query<T> query,
                     Transaction transaction)

Return the number of 'top level' or 'root' entities this query should return.

See Also:

Query.findRowCount(), Query.findFutureRowCount()

findIds

<T> List<Object> findIds(Query<T> query,
                         Transaction transaction)

Return the Id values of the query as a List.

See Also:

Query.findIds()

findIterate

<T> QueryIterator<T> findIterate(Query<T> query,
                                 Transaction transaction)

Return a QueryIterator for the query.

Generally using findEach(Query, QueryEachConsumer, Transaction) or findEachWhile(Query, QueryEachWhileConsumer, Transaction) is preferred to findIterate(). The reason is that those methods automatically take care of closing the queryIterator (and the underlying jdbc statement and resultSet).

This is similar to findEach in that not all the result beans need to be held in memory at the same time and as such is good for processing large queries.

See Also:

Query.findEach(QueryEachConsumer), Query.findEachWhile(QueryEachWhileConsumer)

findEach

<T> void findEach(Query<T> query,
                  QueryEachConsumer<T> consumer,
                  Transaction transaction)

Execute the query visiting the each bean one at a time.

Unlike findList() this is suitable for processing a query that will return a very large resultSet. The reason is that not all the result beans need to be held in memory at the same time and instead processed one at a time.

Internally this query using a PersistenceContext scoped to each bean (and the beans associated object graph).

    ebeanServer.find(Order.class)
      .where().eq("status", Order.Status.NEW)
      .order().asc("id")
      .findEach((Order order) -> {

        // do something with the order bean
        System.out.println(" -- processing order ... " + order);
      });

See Also:

Query.findEach(QueryEachConsumer), Query.findEachWhile(QueryEachWhileConsumer)

findEachWhile

<T> void findEachWhile(Query<T> query,
                       QueryEachWhileConsumer<T> consumer,
                       Transaction transaction)

Execute the query visiting the each bean one at a time.

Compared to findEach() this provides the ability to stop processing the query results early by returning false for the QueryEachWhileConsumer.

Unlike findList() this is suitable for processing a query that will return a very large resultSet. The reason is that not all the result beans need to be held in memory at the same time and instead processed one at a time.

Internally this query using a PersistenceContext scoped to each bean (and the beans associated object graph).

    ebeanServer.find(Order.class)
      .where().eq("status", Order.Status.NEW)
      .order().asc("id")
      .findEachWhile((Order order) -> {

        // do something with the order bean
        System.out.println(" -- processing order ... " + order);

        boolean carryOnProcessing = ...
        return carryOnProcessing;
      });

See Also:

Query.findEach(QueryEachConsumer), Query.findEachWhile(QueryEachWhileConsumer)

findVersions

<T> List<Version<T>> findVersions(Query<T> query,
                                  Transaction transaction)

Return versions of a @History entity bean.

Generally this query is expected to be a find by id or unique predicates query. It will execute the query against the history returning the versions of the bean.

findList

<T> List<T> findList(Query<T> query,
                     Transaction transaction)

Execute a query returning a list of beans.

Generally you are able to use Query.findList() rather than explicitly calling this method. You could use this method if you wish to explicitly control the transaction used for the query.

List<Customer> customers =
    ebeanServer.find(Customer.class)
    .where().ilike("name", "rob%")
    .findList();

Type Parameters:

T - the type of entity bean to fetch.

Parameters:

query - the query to execute.

transaction - the transaction to use (can be null).

Returns:

the list of fetched beans.

See Also:

Query.findList()

findFutureRowCount

<T> FutureRowCount<T> findFutureRowCount(Query<T> query,
                                         Transaction transaction)

Execute find row count query in a background thread.

This returns a Future object which can be used to cancel, check the execution status (isDone etc) and get the value (with or without a timeout).

Parameters:

query - the query to execute the row count on

transaction - the transaction (can be null).

Returns:

a Future object for the row count query

See Also:

Query.findFutureRowCount()

findFutureIds

<T> FutureIds<T> findFutureIds(Query<T> query,
                               Transaction transaction)

Execute find Id's query in a background thread.

This returns a Future object which can be used to cancel, check the execution status (isDone etc) and get the value (with or without a timeout).

Parameters:

query - the query to execute the fetch Id's on

transaction - the transaction (can be null).

Returns:

a Future object for the list of Id's

See Also:

Query.findFutureIds()

findFutureList

<T> FutureList<T> findFutureList(Query<T> query,
                                 Transaction transaction)

Execute find list query in a background thread returning a FutureList object.

This returns a Future object which can be used to cancel, check the execution status (isDone etc) and get the value (with or without a timeout).

This query will execute in it's own PersistenceContext and using its own transaction. What that means is that it will not share any bean instances with other queries.

Parameters:

query - the query to execute in the background

transaction - the transaction (can be null).

Returns:

a Future object for the list result of the query

See Also:

Query.findFutureList()

findFutureList

SqlFutureList findFutureList(SqlQuery query,
                             Transaction transaction)

Execute find list SQL query in a background thread.

This returns a Future object which can be used to cancel, check the execution status (isDone etc) and get the value (with or without a timeout).

Parameters:

query - the query to execute in the background

transaction - the transaction (can be null).

Returns:

a Future object for the list result of the query

findPagedList

<T> PagedList<T> findPagedList(Query<T> query,
                               Transaction transaction,
                               int pageIndex,
                               int pageSize)

Return a PagedList for this query.

The benefit of using this over just using the normal Query.setFirstRow(int) and Query.setMaxRows(int) is that it additionally wraps an optional call to Query.findFutureRowCount() to determine total row count, total page count etc.

Internally this works using Query.setFirstRow(int) and Query.setMaxRows(int) on the query. This translates into SQL that uses limit offset, rownum or row_number function to limit the result set.

Parameters:

pageIndex - The zero based index of the page.

pageSize - The number of beans to return per page.

Returns:

The PagedList

See Also:

Query.findPagedList(int, int)

findSet

<T> Set<T> findSet(Query<T> query,
                   Transaction transaction)

Execute the query returning a set of entity beans.

Generally you are able to use Query.findSet() rather than explicitly calling this method. You could use this method if you wish to explicitly control the transaction used for the query.

Set<Customer> customers =
    ebeanServer.find(Customer.class)
    .where().ilike("name", "rob%")
    .findSet();

Type Parameters:

T - the type of entity bean to fetch.

Parameters:

query - the query to execute

transaction - the transaction to use (can be null).

Returns:

the set of fetched beans.

See Also:

Query.findSet()

findMap

<T> Map<?,T> findMap(Query<T> query,
                     Transaction transaction)

Execute the query returning the entity beans in a Map.

Generally you are able to use Query.findMap() rather than explicitly calling this method. You could use this method if you wish to explicitly control the transaction used for the query.

Type Parameters:

T - the type of entity bean to fetch.

Parameters:

query - the query to execute.

transaction - the transaction to use (can be null).

Returns:

the map of fetched beans.

See Also:

Query.findMap()

findUnique

@Nullable
<T> T findUnique(Query<T> query,
                           Transaction transaction)

Execute the query returning at most one entity bean. This will throw a PersistenceException if the query finds more than one result.

Generally you are able to use Query.findUnique() rather than explicitly calling this method. You could use this method if you wish to explicitly control the transaction used for the query.

Type Parameters:

T - the type of entity bean to fetch.

Parameters:

query - the query to execute.

transaction - the transaction to use (can be null).

Returns:

the list of fetched beans.

See Also:

Query.findUnique()

delete

<T> int delete(Query<T> query,
               Transaction transaction)

Execute as a delete query deleting the 'root level' beans that match the predicates in the query.

Note that if the query includes joins then the generated delete statement may not be optimal depending on the database platform.

Type Parameters:

T - the type of entity bean to fetch.

Parameters:

query - the query used for the delete

transaction - the transaction to use (can be null)

Returns:

the number of beans/rows that were deleted

findList

List<SqlRow> findList(SqlQuery query,
                      Transaction transaction)

Execute the sql query returning a list of MapBean.

Generally you are able to use SqlQuery.findList() rather than explicitly calling this method. You could use this method if you wish to explicitly control the transaction used for the query.

Parameters:

query - the query to execute.

transaction - the transaction to use (can be null).

Returns:

the list of fetched MapBean.

See Also:

SqlQuery.findList()

findSet

Set<SqlRow> findSet(SqlQuery query,
                    Transaction transaction)

Execute the sql query returning a set of MapBean.

Generally you are able to use SqlQuery.findSet() rather than explicitly calling this method. You could use this method if you wish to explicitly control the transaction used for the query.

Parameters:

query - the query to execute.

transaction - the transaction to use (can be null).

Returns:

the set of fetched MapBean.

See Also:

SqlQuery.findSet()

findMap

Map<?,SqlRow> findMap(SqlQuery query,
                      Transaction transaction)

Execute the sql query returning a map of MapBean.

Generally you are able to use SqlQuery.findMap() rather than explicitly calling this method. You could use this method if you wish to explicitly control the transaction used for the query.

Parameters:

query - the query to execute.

transaction - the transaction to use (can be null).

Returns:

the set of fetched MapBean.

See Also:

SqlQuery.findMap()

findUnique

@Nullable
SqlRow findUnique(SqlQuery query,
                            Transaction transaction)

Execute the sql query returning a single MapBean or null.

This will throw a PersistenceException if the query found more than one result.

Generally you are able to use SqlQuery.findUnique() rather than explicitly calling this method. You could use this method if you wish to explicitly control the transaction used for the query.

Parameters:

query - the query to execute.

transaction - the transaction to use (can be null).

Returns:

the fetched MapBean or null if none was found.

See Also:

SqlQuery.findUnique()

save

void save(Object bean)
   throws javax.persistence.OptimisticLockException

Either Insert or Update the bean depending on its state.

If there is no current transaction one will be created and committed for you automatically.

Save can cascade along relationships. For this to happen you need to specify a cascade of CascadeType.ALL or CascadeType.PERSIST on the OneToMany, OneToOne or ManyToMany annotation.

In this example below the details property has a CascadeType.ALL set so saving an order will also save all its details.

  public class Order { ...

           @OneToMany(cascade=CascadeType.ALL, mappedBy="order")
           List<OrderDetail> details;
           ...
  }

When a save cascades via a OneToMany or ManyToMany Ebean will automatically set the 'parent' object to the 'detail' object. In the example below in saving the order and cascade saving the order details the 'parent' order will be set against each order detail when it is saved.

Throws:

javax.persistence.OptimisticLockException

saveAll

int saveAll(Collection<?> beans)
     throws javax.persistence.OptimisticLockException

Save all the beans in the collection.

Throws:

javax.persistence.OptimisticLockException

delete

void delete(Object bean)
     throws javax.persistence.OptimisticLockException

Delete the bean.

If there is no current transaction one will be created and committed for you automatically.

Throws:

javax.persistence.OptimisticLockException

delete

void delete(Object bean,
            Transaction transaction)
     throws javax.persistence.OptimisticLockException

Delete the bean with an explicit transaction.

Throws:

javax.persistence.OptimisticLockException

delete

int delete(Class<?> beanType,
           Object id)

Delete the bean given its type and id.

delete

int delete(Class<?> beanType,
           Object id,
           Transaction transaction)

Delete the bean given its type and id with an explicit transaction.

deleteAll

int deleteAll(Collection<?> beans)
       throws javax.persistence.OptimisticLockException

Delete all the beans in the collection.

Throws:

javax.persistence.OptimisticLockException

deleteAll

int deleteAll(Collection<?> beans,
              Transaction transaction)
       throws javax.persistence.OptimisticLockException

Delete all the beans in the collection using an explicit transaction.

Throws:

javax.persistence.OptimisticLockException

deleteAll

void deleteAll(Class<?> beanType,
               Collection<?> ids)

Delete several beans given their type and id values.

deleteAll

void deleteAll(Class<?> beanType,
               Collection<?> ids,
               Transaction transaction)

Delete several beans given their type and id values with an explicit transaction.

execute

int execute(SqlUpdate sqlUpdate)

Execute a Sql Update Delete or Insert statement. This returns the number of rows that where updated, deleted or inserted. If is executed in batch then this returns -1. You can get the actual rowCount after commit() from updateSql.getRowCount().

If you wish to execute a Sql Select natively then you should use the FindByNativeSql object.

Note that the table modification information is automatically deduced and you do not need to call the Ebean.externalModification() method when you use this method.

Example:

  // example that uses 'named' parameters
  String s = "UPDATE f_topic set post_count = :count where id = :id"

  SqlUpdate update = ebeanServer.createSqlUpdate(s);

  update.setParameter("id", 1);
  update.setParameter("count", 50);

  int modifiedCount = ebeanServer.execute(update);

  String msg = "There where " + modifiedCount + "rows updated";

Parameters:

sqlUpdate - the update sql potentially with bind values

Returns:

the number of rows updated or deleted. -1 if executed in batch.

See Also:

CallableSql

execute

int execute(Update<?> update)

Execute a ORM insert update or delete statement using the current transaction.

This returns the number of rows that where inserted, updated or deleted.

execute

int execute(Update<?> update,
            Transaction transaction)

Execute a ORM insert update or delete statement with an explicit transaction.

execute

int execute(CallableSql callableSql)

For making calls to stored procedures.

Example:

  String sql = "{call sp_order_modify(?,?,?)}";

  CallableSql cs = ebeanServer.createCallableSql(sql);
  cs.setParameter(1, 27);
  cs.setParameter(2, "SHIPPED");
  cs.registerOut(3, Types.INTEGER);

  ebeanServer.execute(cs);

  // read the out parameter
  Integer returnValue = (Integer) cs.getObject(3);

See Also:

CallableSql, Ebean.execute(SqlUpdate)

externalModification

void externalModification(String tableName,
                          boolean inserted,
                          boolean updated,
                          boolean deleted)

Inform Ebean that tables have been modified externally. These could be the result of from calling a stored procedure, other JDBC calls or external programs including other frameworks.

If you use ebeanServer.execute(UpdateSql) then the table modification information is automatically deduced and you do not need to call this method yourself.

This information is used to invalidate objects out of the cache and potentially text indexes. This information is also automatically broadcast across the cluster.

If there is a transaction then this information is placed into the current transactions event information. When the transaction is committed this information is registered (with the transaction manager). If this transaction is rolled back then none of the transaction event information registers including the information you put in via this method.

If there is NO current transaction when you call this method then this information is registered immediately (with the transaction manager).

Parameters:

tableName - the name of the table that was modified

inserted - true if rows where inserted into the table

updated - true if rows on the table where updated

deleted - true if rows on the table where deleted

find

<T> T find(Class<T> beanType,
           Object id,
           Transaction transaction)

Find a entity bean with an explicit transaction.

Type Parameters:

T - the type of entity bean to find

Parameters:

beanType - the type of entity bean to find

id - the bean id value

transaction - the transaction to use (can be null)

save

void save(Object bean,
          Transaction transaction)
   throws javax.persistence.OptimisticLockException

Insert or update a bean with an explicit transaction.

Throws:

javax.persistence.OptimisticLockException

saveAll

int saveAll(Collection<?> beans,
            Transaction transaction)
     throws javax.persistence.OptimisticLockException

Save all the beans in the collection with an explicit transaction.

Throws:

javax.persistence.OptimisticLockException

markAsDirty

void markAsDirty(Object bean)

Marks the entity bean as dirty.

This is used so that when a bean that is otherwise unmodified is updated the version property is updated.

An unmodified bean that is saved or updated is normally skipped and this marks the bean as dirty so that it is not skipped.

Customer customer = ebeanServer.find(Customer, id);

// mark the bean as dirty so that a save() or update() will
// increment the version property
ebeanServer.markAsDirty(customer);
ebeanServer.save(customer);

update

void update(Object bean)
     throws javax.persistence.OptimisticLockException

Saves the bean using an update. If you know you are updating a bean then it is preferrable to use this update() method rather than save().

Stateless updates: Note that the bean does not have to be previously fetched to call update().You can create a new instance and set some of its properties programmatically for via JSON/XML marshalling etc. This is described as a 'stateless update'.

Optimistic Locking: Note that if the version property is not set when update() is called then no optimistic locking is performed (internally ConcurrencyMode.NONE is used).

ServerConfig.setUpdatesDeleteMissingChildren(boolean): When cascade saving to a OneToMany or ManyToMany the updatesDeleteMissingChildren setting controls if any other children that are in the database but are not in the collection are deleted.

ServerConfig.setUpdateChangesOnly(boolean): The updateChangesOnly setting controls if only the changed properties are included in the update or if all the loaded properties are included instead.

// A 'stateless update' example
Customer customer = new Customer();
customer.setId(7);
customer.setName("ModifiedNameNoOCC");
ebeanServer.update(customer);

Throws:

javax.persistence.OptimisticLockException

See Also:

ServerConfig.setUpdatesDeleteMissingChildren(boolean), ServerConfig.setUpdateChangesOnly(boolean)

update

void update(Object bean,
            Transaction transaction)
     throws javax.persistence.OptimisticLockException

Update a bean additionally specifying a transaction.

Throws:

javax.persistence.OptimisticLockException

update

void update(Object bean,
            Transaction transaction,
            boolean deleteMissingChildren)
     throws javax.persistence.OptimisticLockException

Update a bean additionally specifying a transaction and the deleteMissingChildren setting.

Parameters:

bean - the bean to update

transaction - the transaction to use (can be null).

deleteMissingChildren - specify false if you do not want 'missing children' of a OneToMany or ManyToMany to be automatically deleted.

Throws:

javax.persistence.OptimisticLockException

updateAll

void updateAll(Collection<?> beans)
        throws javax.persistence.OptimisticLockException

Update a collection of beans. If there is no current transaction one is created and used to update all the beans in the collection.

Throws:

javax.persistence.OptimisticLockException

updateAll

void updateAll(Collection<?> beans,
               Transaction transaction)
        throws javax.persistence.OptimisticLockException

Update a collection of beans with an explicit transaction.

Throws:

javax.persistence.OptimisticLockException

insert

void insert(Object bean)

Insert the bean.

Compared to save() this forces bean to perform an insert rather than trying to decide based on the bean state. As such this is useful when you fetch beans from one database and want to insert them into another database (and you want to explicitly insert them).

insert

void insert(Object bean,
            Transaction transaction)

Insert the bean with a transaction.

insertAll

void insertAll(Collection<?> beans)

Insert a collection of beans. If there is no current transaction one is created and used to insert all the beans in the collection.

insertAll

void insertAll(Collection<?> beans,
               Transaction transaction)

Insert a collection of beans with an explicit transaction.

deleteManyToManyAssociations

int deleteManyToManyAssociations(Object ownerBean,
                                 String propertyName)

Delete the associations (from the intersection table) of a ManyToMany given the owner bean and the propertyName of the ManyToMany collection.

Typically these deletions occur automatically when persisting a ManyToMany collection and this provides a way to invoke those deletions directly.

Returns:

the number of associations deleted (from the intersection table).

deleteManyToManyAssociations

int deleteManyToManyAssociations(Object ownerBean,
                                 String propertyName,
                                 Transaction transaction)

Delete the associations (from the intersection table) of a ManyToMany given the owner bean and the propertyName of the ManyToMany collection.

Additionally specify a transaction to use.

Typically these deletions occur automatically when persisting a ManyToMany collection and this provides a way to invoke those deletions directly.

Returns:

the number of associations deleted (from the intersection table).

saveManyToManyAssociations

void saveManyToManyAssociations(Object ownerBean,
                                String propertyName)

Save the associations of a ManyToMany given the owner bean and the propertyName of the ManyToMany collection.

Typically the saving of these associations (inserting into the intersection table) occurs automatically when persisting a ManyToMany. This provides a way to invoke those insertions directly.

saveManyToManyAssociations

void saveManyToManyAssociations(Object ownerBean,
                                String propertyName,
                                Transaction transaction)

Save the associations of a ManyToMany given the owner bean and the propertyName of the ManyToMany collection.

Typically the saving of these associations (inserting into the intersection table) occurs automatically when persisting a ManyToMany. This provides a way to invoke those insertions directly.

saveAssociation

void saveAssociation(Object ownerBean,
                     String propertyName)

Save the associated collection or bean given the property name.

This is similar to performing a save cascade on a specific property manually.

Note that you can turn on/off cascading for a transaction via Transaction.setPersistCascade(boolean)

Parameters:

ownerBean - the bean instance holding the property we want to save

propertyName - the property we want to save

saveAssociation

void saveAssociation(Object ownerBean,
                     String propertyName,
                     Transaction transaction)

Save the associated collection or bean given the property name with a specific transaction.

This is similar to performing a save cascade on a specific property manually.

Note that you can turn on/off cascading for a transaction via Transaction.setPersistCascade(boolean)

Parameters:

ownerBean - the bean instance holding the property we want to save

propertyName - the property we want to save

execute

int execute(SqlUpdate updSql,
            Transaction transaction)

Execute explicitly passing a transaction.

execute

int execute(CallableSql callableSql,
            Transaction transaction)

Execute explicitly passing a transaction.

execute

void execute(TxScope scope,
             TxRunnable runnable)

Execute a TxRunnable in a Transaction with an explicit scope.

The scope can control the transaction type, isolation and rollback semantics.

  // set specific transactional scope settings
  TxScope scope = TxScope.requiresNew().setIsolation(TxIsolation.SERIALIZABLE);

  ebeanServer.execute(scope, new TxRunnable() {
           public void run() {
                   User u1 = Ebean.find(User.class, 1);
                   ...
           }
  });

execute

void execute(TxRunnable runnable)

Execute a TxRunnable in a Transaction with the default scope.

The default scope runs with REQUIRED and by default will rollback on any exception (checked or runtime).

   ebeanServer.execute(new TxRunnable() {
     public void run() {
       User u1 = ebeanServer.find(User.class, 1);
       User u2 = ebeanServer.find(User.class, 2);

       u1.setName("u1 mod");
       u2.setName("u2 mod");

       ebeanServer.save(u1);
       ebeanServer.save(u2);
     }
   });

execute

<T> T execute(TxScope scope,
              TxCallable<T> callable)

Execute a TxCallable in a Transaction with an explicit scope.

The scope can control the transaction type, isolation and rollback semantics.

  // set specific transactional scope settings
  TxScope scope = TxScope.requiresNew().setIsolation(TxIsolation.SERIALIZABLE);

  ebeanServer.execute(scope, new TxCallable<String>() {
           public String call() {
                   User u1 = ebeanServer.find(User.class, 1);
                   ...
                   return u1.getEmail();
           }
  });

execute

<T> T execute(TxCallable<T> callable)

Execute a TxCallable in a Transaction with the default scope.

The default scope runs with REQUIRED and by default will rollback on any exception (checked or runtime).

This is basically the same as TxRunnable except that it returns an Object (and you specify the return type via generics).

  ebeanServer.execute(new TxCallable<String>() {
    public String call() {
      User u1 = ebeanServer.find(User.class, 1);
      User u2 = ebeanServer.find(User.class, 2);

      u1.setName("u1 mod");
      u2.setName("u2 mod");

      ebeanServer.save(u1);
      ebeanServer.save(u2);

      return u1.getEmail();
    }
  });

getServerCacheManager

ServerCacheManager getServerCacheManager()

Return the manager of the server cache ("L2" cache).

getBackgroundExecutor

BackgroundExecutor getBackgroundExecutor()

Return the BackgroundExecutor service for asynchronous processing of queries.

runCacheWarming

void runCacheWarming()

Run the cache warming queries on all bean types that have one defined.

A cache warming query can be defined via CacheStrategy.

runCacheWarming

void runCacheWarming(Class<?> beanType)

Run the cache warming query for a specific bean type.

A cache warming query can be defined via CacheStrategy.

json

JsonContext json()

Return the JsonContext for reading/writing JSON.

This instance is safe to be used concurrently by multiple threads and this method is cheap to call.

Simple example:

    JsonContext json = ebeanServer.json();
    String jsonOutput = json.toJson(list);
    System.out.println(jsonOutput);

Using PathProperties:

    // specify just the properties we want
    PathProperties paths = PathProperties.parse("name, status, anniversary");

    List<Customer> customers =
      ebeanServer.find(Customer.class)
        // apply those paths to the query (only fetch what we need)
        .apply(paths)
        .where().ilike("name", "rob%")
        .findList();

    // ... get the json
    JsonContext jsonContext = ebeanServer.json();
    String json = jsonContext.toJson(customers, paths);

See Also:

PathProperties, Query.apply(com.avaje.ebean.text.PathProperties)