com.ibatis.sqlmap.client

Interface SqlMapTransactionManager

All Known Subinterfaces:

SqlMapClient, SqlMapClient, SqlMapSession

public interface SqlMapTransactionManager

This interface declares methods for demarcating SQL Map transactions.

See Also:

SqlMapSession, SqlMapClient

Method Summary

Modifier and Type	Method and Description
void	commitTransaction() Commits the currently started transaction.
void	endTransaction() Ends a transaction and rolls back if necessary.
Connection	getCurrentConnection() Returns the current connection in use.
DataSource	getDataSource() Returns the DataSource instance currently being used by the SqlMapSession.
void	setUserConnection(Connection connnection) Allows the developer to easily use an externally supplied connection when executing statements.
void	startTransaction() Demarcates the beginning of a transaction scope.
void	startTransaction(int transactionIsolation) Demarcates the beginning of a transaction scope using the specified transaction isolation.

Method Detail

startTransaction

void startTransaction()
               throws SQLException

Demarcates the beginning of a transaction scope. Transactions must be properly committed or rolled back to be effective. Use the following pattern when working with transactions:

 try {
     sqlMap.startTransaction();
     // do work
     sqlMap.commitTransaction();
 } finally {
     sqlMap.endTransaction();
 }
 

Always call endTransaction() once startTransaction() has been called.

Throws:

SQLException - If an error occurs while starting the transaction, or the transaction could not be started.

startTransaction

void startTransaction(int transactionIsolation)
               throws SQLException

Demarcates the beginning of a transaction scope using the specified transaction isolation. Transactions must be properly committed or rolled back to be effective. Use the following pattern when working with transactions:

 try {
     sqlMap.startTransaction(Connection.TRANSACTION_REPEATABLE_READ);
     // do work
     sqlMap.commitTransaction();
 } finally {
     sqlMap.endTransaction();
 }
 

Always call endTransaction() once startTransaction() has been called.

Throws:

SQLException - If an error occurs while starting the transaction, or the transaction could not be started.

commitTransaction

void commitTransaction()
                throws SQLException

Commits the currently started transaction.

Throws:

SQLException - If an error occurs while committing the transaction, or the transaction could not be committed.

endTransaction

void endTransaction()
             throws SQLException

Ends a transaction and rolls back if necessary. If the transaction has been started, but not committed, it will be rolled back upon calling endTransaction().

Throws:

SQLException - If an error occurs during rollback or the transaction could not be ended.

setUserConnection

void setUserConnection(Connection connnection)
                throws SQLException

Allows the developer to easily use an externally supplied connection when executing statements.

Important: Using a user supplied connection basically sidesteps the transaction manager, so you are responsible for appropriately. Here's a (very) simple example (throws SQLException):

 try {
     Connection connection = dataSource.getConnection();
     sqlMap.setUserConnection(connection);
     // do work
     connection.commit();
 } catch (SQLException e) {
     try {
         if (connection != null)
             commit.rollback();
     } catch (SQLException ignored) {
         // generally ignored
     }
     throw e; // rethrow the exception
 } finally {
     try {
         if (connection != null)
             connection.close();
     } catch (SQLException ignored) {
         // generally ignored
     }
 }
 

Parameters:

connnection -

Throws:

SQLException

getCurrentConnection

Connection getCurrentConnection()
                         throws SQLException

Returns the current connection in use. If no connection exists null will be returned. There may be no connection if no transaction has been started, and if no user provided connection has been set.

Returns:

The current connection or null.

Throws:

SQLException

getDataSource

DataSource getDataSource()

Returns the DataSource instance currently being used by the SqlMapSession.

Returns:

The DataSource instance currently being used by the SqlMapSession.