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 Summary

void	function(FunctionContext fc, String[] args) Callback for regular function.
void	last_step(FunctionContext fc) Callback for final step in aggregate function.
void	step(FunctionContext fc, String[] args) Callback for one step in aggregate function.

Method Detail

function

public void function(FunctionContext fc,
                     String[] args)

Callback for regular function.

Parameters:

fc - function's context for reporting result

args - String array of arguments

last_step

public void last_step(FunctionContext fc)

Callback for final step in aggregate function.

Parameters:

fc - function's context for reporting result

step

public 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