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Bug#27033: 0 as LAST_INSERT_ID() after INSERT .. ON DUPLICATE if rows were

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touched but not actually changed.

The LAST_INSERT_ID() is reset to 0 if no rows were inserted or changed.
This is the case when an INSERT ... ON DUPLICATE KEY UPDATE updates a row
with the same values as the row contains.

Now the LAST_INSERT_ID() values is reset to 0 only if there were no rows
successfully inserted or touched.
The new 'touched' field is added to the COPY_INFO structure. It holds the
number of rows that were touched no matter whether they were actually
changed or not.
This commit is contained in:
evgen@moonbone.local
2007-03-15 23:21:29 +03:00
parent d0a6231201
commit 92c8558224
4 changed files with 49 additions and 12 deletions
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11
mysql-test/r/insert_update.result
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@ -236,3 +236,14 @@ INSERT INTO t2 VALUES (1), (3);
INSERT INTO t1 SELECT 1, COUNT(*) FROM t2 ON DUPLICATE KEY UPDATE j= a;
ERROR 42S22: Unknown column 'a' in 'field list'
DROP TABLE t1,t2;
CREATE TABLE t1 (f1 INT AUTO_INCREMENT PRIMARY KEY,
f2 VARCHAR(5) NOT NULL UNIQUE);
INSERT t1 (f2) VALUES ('test') ON DUPLICATE KEY UPDATE f1 = LAST_INSERT_ID(f1);
SELECT LAST_INSERT_ID();
LAST_INSERT_ID()
1
INSERT t1 (f2) VALUES ('test') ON DUPLICATE KEY UPDATE f1 = LAST_INSERT_ID(f1);
SELECT LAST_INSERT_ID();
LAST_INSERT_ID()
1
DROP TABLE t1;