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sql-statement-deallocate.md

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title DEALLOCATE | TiDB SQL Statement Reference
summary An overview of the usage of DEALLOCATE for the TiDB database.

DEALLOCATE

The DEALLOCATE statement provides an SQL interface to server-side prepared statements.

Synopsis

DeallocateStmt ::=
    DeallocateSym 'PREPARE' Identifier

DeallocateSym ::=
    'DEALLOCATE'
|   'DROP'

Identifier ::=
    identifier
|   UnReservedKeyword
|   NotKeywordToken
|   TiDBKeyword

Examples

mysql> PREPARE mystmt FROM 'SELECT ? as num FROM DUAL';
Query OK, 0 rows affected (0.00 sec)

mysql> SET @number = 5;
Query OK, 0 rows affected (0.00 sec)

mysql> EXECUTE mystmt USING @number;
+------+
| num  |
+------+
| 5    |
+------+
1 row in set (0.00 sec)

mysql> DEALLOCATE PREPARE mystmt;
Query OK, 0 rows affected (0.00 sec)

MySQL compatibility

The DEALLOCATE statement in TiDB is fully compatible with MySQL. If you find any compatibility differences, report a bug.

See also