sql-statement-prepare.md

title	summary	aliases
PREPARE | TiDB SQL Statement Reference	An overview of the usage of PREPARE for the TiDB database.	/docs/dev/sql-statements/sql-statement-prepare/ /docs/dev/reference/sql/statements/prepare/

PREPARE

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

Synopsis

PreparedStmt ::=
    'PREPARE' Identifier 'FROM' PrepareSQL

PrepareSQL ::=
    stringLit
|   UserVariable

Note:

For each PREPARE statement, the maximum number of placeholders is 65535.

To limit the number of PREPARE statements in the current TiDB instance, you can use the max_prepared_stmt_count system variable.

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

See also

• EXECUTE
• DEALLOCATE