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MySQL Stored Procedure Programming
book

MySQL Stored Procedure Programming

by Guy Harrison, Steven Feuerstein
March 2006
Intermediate to advanced content levelIntermediate to advanced
640 pages
17h 8m
English
O'Reilly Media, Inc.
Content preview from MySQL Stored Procedure Programming

MySQL 5 "Strict" Mode

MySQL 5 "strict " mode applies when either STRICT_TRANS_TABLES or STRICT_ALL_TABLES is included in the list of options supplied to the sql_mode configuration variable. STRICT_ALL_TABLES will cause any attempt to set a column to an invalid value to fail with an error. STRICT_TRANS_TABLES has the same effect, but only if the table is transactional.

If neither of these settings is in effect, MySQL will either accept the update or do a "best fit" of the invalid value into a legal column value. For instance, if you try to assign a string value into an integer column, MySQL may set the value of the column to 0. A warning will be generated whenever such a "truncation" occurs.

Strict mode will also cause errors to occur for missing columns in an INSERT statement, unless that column has an associated DEFAULT clause.

STRICT_ALL_TABLES can have some dubious side effects when you are performing multirow updates or inserts into nontransactional tables. Because there is no rollback capability for a nontransactional table, the error may occur after a certain number of valid row updates have occurred. This means that in the event of a strict-mode error on a nontransactional table, the SQL statement may partially succeed. This is rarely desirable behavior, and for this reason the default setting in MySQL 5.0 is STRICT_TRANS_TABLES.

You can change your strict mode at any time with a SET statement:

    SET sql_mode='STRICT_ALL_TABLES'

The strict mode also determines how stored programs ...

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Publisher Resources

ISBN: 0596100892Supplemental ContentErrata Page