MySQL 5.6 Reference Manual Including MySQL NDB Cluster 7.3-7.4 Reference Guide
DECLAREcondition_name
CONDITION FORcondition_value
condition_value
: {mysql_error_code
| SQLSTATE [VALUE]sqlstate_value
}
The DECLARE
... CONDITION
statement declares a named error
condition, associating a name with a condition that needs
specific handling. The name can be referred to in a subsequent
DECLARE ...
HANDLER
statement (see
Section 13.6.7.2, “DECLARE ... HANDLER Statement”).
Condition declarations must appear before cursor or handler declarations.
The condition_value
for
DECLARE ...
CONDITION
indicates the specific condition or class of
conditions to associate with the condition name. It can take the
following forms:
mysql_error_code
: An integer
literal indicating a MySQL error code.
Do not use MySQL error code 0 because that indicates success rather than an error condition. For a list of MySQL error codes, see Server Error Message Reference.
SQLSTATE [VALUE] sqlstate_value
:
A 5-character string literal indicating an SQLSTATE value.
Do not use SQLSTATE values that begin with
'00'
because those indicate success
rather than an error condition. For a list of SQLSTATE
values, see Server Error Message Reference.
Condition names referred to in
SIGNAL
or use
RESIGNAL
statements must be
associated with SQLSTATE values, not MySQL error codes.
Using names for conditions can help make stored program code clearer. For example, this handler applies to attempts to drop a nonexistent table, but that is apparent only if you know that 1051 is the MySQL error code for “unknown table”:
DECLARE CONTINUE HANDLER FOR 1051 BEGIN -- body of handler END;
By declaring a name for the condition, the purpose of the handler is more readily seen:
DECLARE no_such_table CONDITION FOR 1051; DECLARE CONTINUE HANDLER FOR no_such_table BEGIN -- body of handler END;
Here is a named condition for the same condition, but based on the corresponding SQLSTATE value rather than the MySQL error code:
DECLARE no_such_table CONDITION FOR SQLSTATE '42S02'; DECLARE CONTINUE HANDLER FOR no_such_table BEGIN -- body of handler END;