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Auto-merge from mysql-trunk-bugfixing.

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******
This patch fixes the following bugs:
  - Bug#5889: Exit handler for a warning doesn't hide the warning in
    trigger
  - Bug#9857: Stored procedures: handler for sqlwarning ignored
  - Bug#23032: Handlers declared in a SP do not handle warnings generated
    in sub-SP
  - Bug#36185: Incorrect precedence for warning and exception handlers

The problem was in the way warnings/errors during stored routine execution
were handled. Prior to this patch the logic was as follows:

  - when a warning/an error happens: if we're executing a stored routine,
    and there is a handler for that warning/error, remember the handler,
    ignore the warning/error and continue execution.

  - after a stored routine instruction is executed: check for a remembered
    handler and activate one (if any).

This logic caused several problems:

  - if one instruction generates several warnings (errors) it's impossible
    to choose the right handler -- a handler for the first generated
    condition was chosen and remembered for activation.

  - mess with handling conditions in scopes different from the current one.

  - not putting generated warnings/errors into Warning Info (Diagnostic
    Area) is against The Standard.

The patch changes the logic as follows:

  - Diagnostic Area is cleared on the beginning of each statement that
    either is able to generate warnings, or is able to work with tables.

  - at the end of a stored routine instruction, Diagnostic Area is left
    intact.

  - Diagnostic Area is checked after each stored routine instruction. If
    an instruction generates several condition, it's now possible to take a
    look at all of them and determine an appropriate handler.
This commit is contained in:
Alexander Nozdrin
2010-07-30 19:28:36 +04:00
parent 02a0787d8d
commit b2f8005094
30 changed files with 1385 additions and 344 deletions
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30
sql/sql_class.cc
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@ -845,35 +845,6 @@ MYSQL_ERROR* THD::raise_condition(uint sql_errno,
}
}
/*
If a continue handler is found, the error message will be cleared
by the stored procedures code.
*/
if (!is_fatal_error && spcont &&
spcont->handle_condition(this, sql_errno, sqlstate, level, msg, &cond))
{
/*
Do not push any warnings, a handled error must be completely
silenced.
*/
DBUG_RETURN(cond);
}
/* Un-handled conditions */
cond= raise_condition_no_handler(sql_errno, sqlstate, level, msg);
DBUG_RETURN(cond);
}
MYSQL_ERROR*
THD::raise_condition_no_handler(uint sql_errno,
const char* sqlstate,
MYSQL_ERROR::enum_warning_level level,
const char* msg)
{
MYSQL_ERROR *cond= NULL;
DBUG_ENTER("THD::raise_condition_no_handler");
query_cache_abort(&query_cache_tls);
/* FIXME: broken special case */
@ -886,6 +857,7 @@ THD::raise_condition_no_handler(uint sql_errno,
cond= warning_info->push_warning(this, sql_errno, sqlstate, level, msg);
DBUG_RETURN(cond);
}
extern "C"
void *thd_alloc(MYSQL_THD thd, unsigned int size)
{