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Description

MySQL Error 1314 occurs when you attempt to use a SQL statement or construct that is explicitly not allowed within the context of a stored procedure. This typically happens because stored procedures have a restricted set of permissible operations, often excluding certain DDL or administrative commands.

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Error Message

%s is not allowed in stored procedures

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Known Causes

3 known causes

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Using DDL Statements

Attempting to execute Data Definition Language (DDL) commands, such as CREATE TABLE, DROP INDEX, or ALTER TABLE, directly within a stored procedure, which MySQL generally restricts.

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Dynamic DDL/DCL with Prepared Statements

Employing PREPARE and EXECUTE for DDL or Data Control Language (DCL) operations within a stored procedure, as MySQL typically prohibits these for security and integrity reasons.

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Prohibited Administrative Commands

Including certain server-level administrative commands or complex SQL statements that are explicitly disallowed within the stored procedure's execution context.

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Solutions

3 solutions available

1. Identify and Remove Prohibited Statement easy

Locate the problematic statement within your stored procedure and remove or replace it.

1

Review the stored procedure code carefully. The error message usually indicates the type of statement that is not allowed (e.g., 'PREPARE' statement, 'EXECUTE' statement, 'DEALLOCATE PREPARE' statement, 'SHOW DATABASES' statement, etc.).

2

Once you've identified the statement, either delete it entirely if it's not essential for the procedure's logic, or find an alternative, allowed method to achieve the same result.

/* Example: If you found a 'PREPARE' statement, you might need to rewrite the query to use dynamic SQL within a variable and then execute that variable, or use a simpler, static query if possible. */

3

Save the modified stored procedure and attempt to create or execute it again.

DELIMITER //
CREATE PROCEDURE my_procedure () 
BEGIN
    -- Your corrected code here
END //
DELIMITER ;

CALL my_procedure();

2. Utilize Dynamic SQL Workarounds for Restricted Statements medium

For statements that are strictly prohibited, explore dynamic SQL techniques as a workaround.

1

Understand which specific statement is causing the error. Common examples include `PREPARE`, `EXECUTE`, `DEALLOCATE PREPARE`, and certain `SHOW` statements when executed directly within a stored procedure.

2

If the prohibited statement is related to dynamic SQL (like `PREPARE` or `EXECUTE`), you might be able to achieve the functionality by constructing the SQL statement as a string and then executing it using `PREPARE`, `EXECUTE`, and `DEALLOCATE PREPARE` within a different context (e.g., a temporary procedure or a client-side script). However, be aware that some versions of MySQL might still restrict these even in a dynamic context within a stored procedure.

-- This is a conceptual example and might still be restricted depending on the exact disallowed statement and MySQL version.

SET @sql_stmt = 'SELECT * FROM my_table WHERE id = ?';
PREPARE stmt FROM @sql_stmt;
SET @id_value = 1;
EXECUTE stmt USING @id_value;
DEALLOCATE PREPARE stmt;

3

If the prohibited statement is a `SHOW` command (e.g., `SHOW DATABASES`, `SHOW TABLES`), you can often retrieve the information by querying the `INFORMATION_SCHEMA` database, which is generally allowed within stored procedures.

SELECT schema_name FROM information_schema.schemata;

4

Test the workaround thoroughly to ensure it functions as expected and doesn't introduce new issues.

3. Check MySQL Version and Privileges medium

Ensure your MySQL version supports the statements you're using and that the user has the necessary privileges.

1

Determine the exact version of your MySQL server. Some statements might be allowed in newer versions but restricted in older ones.

SELECT VERSION();

2

Consult the MySQL documentation for your specific version to verify if the statement you're using is permitted within stored procedures. The error message '%s is not allowed in stored procedures' is a strong indicator that the statement is indeed restricted.

3

If the statement is generally allowed but you're encountering this error, it's possible that the user executing the stored procedure lacks the necessary privileges. While less common for this specific error code, it's worth considering if other solutions fail.

SHOW GRANTS FOR 'your_user'@'your_host';

4

If necessary, grant the required privileges to the user or consider upgrading your MySQL version if the statement is a feature of a newer release.

GRANT EXECUTE ON PROCEDURE your_database.your_procedure TO 'your_user'@'your_host';

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Related Errors

5 related errors

MySQL Error 1314: Invalid Statement in Stored Procedure