April 2008
Intermediate to advanced
566 pages
21h 55m
English
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Name
SHOW ERRORS
Synopsis
SHOW ERRORS [LIMIT [offset,]count] SHOW COUNT(*) ERRORS
Use this statement to display error messages. The results
are only for the previous statement that has been executed. To see the
number of error messages generated by an SQL statement, use
COUNT(*). To limit the number of error messages
displayed, use the LIMIT clause. An offset can be
given along with the count to specify a starting point for displaying
error messages.
This statement is available as of version 4.1 of MySQL. It will
not display warnings or notes—just error messages. Use SHOW
WARNINGS to get all three types of messages.
Here are a couple of examples of this statement, which were
entered after an INSERT statement was entered and
encountered a problem:
SHOW COUNT(*) ERRORS; +-----------------------+ | @@session.error_count | +-----------------------+ | 1 | +-----------------------+ SHOW ERRORS; +-------+------+-------------------------------------------------+ | Level | Code | Message | +-------+------+-------------------------------------------------+ | Error | 1136 | Column count doesn't match value count at row 2 | +-------+------+-------------------------------------------------+
The first statement returns the number of error messages
generated by the INSERT statement. Notice that the
results are stored in the session variable
error_count, which is updated by each statement issued in the session. The second statement displays the error messages. This statement is perhaps more meaningful ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.