org.eclipse.dirigible.databases.helpers

Class DatabaseQueryHelper

java.lang.Object

org.eclipse.dirigible.databases.helpers.DatabaseQueryHelper

public class DatabaseQueryHelper
extends Object

Convenience class for common DataSource operations. An instance represents a single DataSource.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DatabaseQueryHelper.Config The Enum Config.
static interface	DatabaseQueryHelper.Filter<T> The Interface Filter.
static interface	DatabaseQueryHelper.RequestExecutionCallback The Interface RequestExecutionCallback.
static interface	DatabaseQueryHelper.ResultSetIteratorCallback Callback interface for the executeQueryStatement(Connection, String, ResultSetIteratorCallback) method.

Method Summary

Modifier and Type	Method and Description
static void	executeQueryStatement(Connection connection, String sql, DatabaseQueryHelper.ResultSetIteratorCallback callback) Unlike executeSingleStatement(String, boolean, RequestIteratorCallback), this method iterates on the ResultSet and produces a table data structure in the form of a list of ordered key-value tuples.
static void	executeSingleStatement(Connection connection, String sql, boolean isQuery, DatabaseQueryHelper.RequestExecutionCallback callback) Executes a single SQL statement.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

executeSingleStatement

public static void executeSingleStatement(Connection connection,
                                          String sql,
                                          boolean isQuery,
                                          DatabaseQueryHelper.RequestExecutionCallback callback)

Executes a single SQL statement. The callbacks are on queryDone in case of query or updateDone in case of update, and on error. The method does not iterate on the result set and its pointer is in its initial position. It is up to the callback to do something with it.

Parameters:

connection - the connection

sql - the SQL expression

isQuery - whether it is a query or update

callback - the callback

executeQueryStatement

public static void executeQueryStatement(Connection connection,
                                         String sql,
                                         DatabaseQueryHelper.ResultSetIteratorCallback callback)

Unlike executeSingleStatement(String, boolean, RequestIteratorCallback), this method iterates on the ResultSet and produces a table data structure in the form of a list of ordered key-value tuples. Schematically it looks like this:

 [[{column 1:value A}, {column 2: value B}, {column 3: value C}],
  [{column 1:value D}, {column 2: value E}, {column 3: value F}],
  [{column 1:value G}, {column 2: value I}, {column 3: value H}]]
 

The callbacks are on completing the whole data structure, on error, and on each row construction.

Parameters:

connection - the connection

sql - the SQL expression

callback - the callback