diff --git a/doc/src/sgml/ref/release_savepoint.sgml b/doc/src/sgml/ref/release_savepoint.sgml index 39665d28ef..daf8eb9a43 100644 --- a/doc/src/sgml/ref/release_savepoint.sgml +++ b/doc/src/sgml/ref/release_savepoint.sgml @@ -82,8 +82,9 @@ RELEASE [ SAVEPOINT ] savepoint_name - If multiple savepoints have the same name, only the one that was most - recently defined is released. + If multiple savepoints have the same name, only the most recently defined + unreleased one is released. Repeated commands will release progressively + older savepoints. diff --git a/doc/src/sgml/ref/savepoint.sgml b/doc/src/sgml/ref/savepoint.sgml index b17342a1ee..f84ac3d167 100644 --- a/doc/src/sgml/ref/savepoint.sgml +++ b/doc/src/sgml/ref/savepoint.sgml @@ -53,7 +53,9 @@ SAVEPOINT savepoint_name savepoint_name - The name to give to the new savepoint. + The name to give to the new savepoint. If savepoints with the + same name already exist, they will be inaccessible until newer + identically-named savepoints are released. @@ -106,6 +108,32 @@ COMMIT; The above transaction will insert both 3 and 4. + + + To use a single savepoint name: + +BEGIN; + INSERT INTO table1 VALUES (1); + SAVEPOINT my_savepoint; + INSERT INTO table1 VALUES (2); + SAVEPOINT my_savepoint; + INSERT INTO table1 VALUES (3); + + -- rollback to the second savepoint + ROLLBACK TO SAVEPOINT my_savepoint; + SELECT * FROM table1; -- shows rows 1 and 2 + + -- release the second savepoint + RELEASE SAVEPOINT my_savepoint; + + -- rollback to the first savepoint + ROLLBACK TO SAVEPOINT my_savepoint; + SELECT * FROM table1; -- shows only row 1 +COMMIT; + + The above transaction shows row 3 being rolled back first, then row 2. + +