Package SQLite

Interface Function

  • public interface Function
    Callback interface for SQLite's user defined functions. Each callback method receives a FunctionContext object which is used to set the function result or error code.

    Example:
       class SinFunc implements SQLite.Function {
     public void function(SQLite.FunctionContext fc, String args[]) {
       try {
         Double d = new Double(args[0]);
         fc.set_result(Math.sin(d.doubleValue()));
       } catch (Exception e) {
         fc.set_error("sin(" + args[0] + "):" + e);
       }
     }
     ...
   }
   SQLite.Database db = new SQLite.Database();
   db.open("db", 0);
   db.create_function("sin", 1, SinFunc);
   ...
   db.exec("select sin(1.0) from test", null);

    • Method Detail

      • function

        void function​(FunctionContext fc,
              String[] args)
        Callback for regular function.
        Parameters:
        fc - function's context for reporting result
        args - String array of arguments

      • step

        void step​(FunctionContext fc,
          String[] args)
        Callback for one step in aggregate function.
        Parameters:
        fc - function's context for reporting result
        args - String array of arguments

      • last_step

        void last_step​(FunctionContext fc)
        Callback for final step in aggregate function.
        Parameters:
        fc - function's context for reporting result