When I execute INSERT ON DUPLICATE KEY UPDATE (IODKU) in Mysql command line interface,

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Asked: May 26, 20262026-05-26T13:36:12+00:00 2026-05-26T13:36:12+00:00

When I execute INSERT ON DUPLICATE KEY UPDATE (IODKU) in Mysql command line interface,

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When I execute INSERT ON DUPLICATE KEY UPDATE (IODKU) in Mysql command line interface, it returns 2 rows updated, when the INSERT hits a duplicate key constraint.

In JDBC it returns 3 rows updated.

Has anyone experienced something similar?

Running Mysql 5.1 with Mysql Connector/J 5.1.14. Bug report: http://bugs.mysql.com/61850

Example query:

INSERT INTO session (tstamp, session_id, key1, key2, key3)
VALUES ('2011-07-13 10:08:01', 2, 21, 22, 23) 
    ON DUPLICATE KEY UPDATE tstamp='2011-07-13 10:08:01'