Difference between revisions of "SAVEPOINT"

Revision as of 07:51, 8 December 2012

Purpose

Identifies a stage within a transaction which can subsequently be used as ROLLBACK point.

Syntax

SAVEPOINT <savepoint>

See Also

BEGIN TRANSACTION, COMMIT, END TRANSACTION, ROLLBACK, SAVE TRANSACTION, SET TRANSACTION, TXNISOLATION(), TXNLEVEL()

Description

The SAVEPOINT statement identifies a stage within a transaction which can subsequently be used as ROLLBACK point. The name of the savepoint is specified in <savepoint>.

Issuing the SAVEPOINT <savepoint> statement causes the TXNLEVEL() to increase by 1. If the transaction is rolled back to the <savepoint> using the ROLLBACK command, the TXNLEVEL will decrease by 1 and a partial rollback of the transaction will be carried out. Changes made since the specified <savepoint> was declared are discarded and the transaction continues from the <savepoint>.

A transaction is a sequence of SQL statements that Lianja treats as a single unit. A transaction begins with the first executable SQL statement after a BEGIN TRANSACTION. A transaction ends with a COMMIT, ROLLBACK or END TRANSACTION.

Example

BEGIN TRANSACTION parent_and_child
  INSERT INTO customer;
    (TITLE, LAST_NAME, FIRST_NAME, INITIAL, STREET,;
    CITY, STATE, ZIP,LIMIT, START_DATE);
    VALUES;
    ('Ms', 'Jones', 'Susan', 'B', '177 High Street', 'Beverly', 'MA', '01915', 2000, date())
  SAVEPOINT parent_added
  INSERT INTO accounts (ORD_VALUE) VALUES (30)
  ROLLBACK TRANSACTION parent_added
END TRANSACTION

Products

Lianja Server, Lianja