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Description

MariaDB Error 1295 occurs when an attempt is made to execute an SQL command or feature using the prepared statement protocol that is not yet supported by it. This typically happens when trying to prepare DDL (Data Definition Language) commands, administrative statements, or certain complex SQL constructs that are primarily designed for direct execution.

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Error Message

This command is not supported in the prepared statement protocol yet

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Known Causes

3 known causes

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DDL or Administrative Commands

You are attempting to prepare a Data Definition Language (DDL) or administrative SQL command (e.g., CREATE TABLE, DROP DATABASE, USE database) that is typically not supported by the prepared statement protocol.

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Unsupported SQL Features

The SQL statement contains functions, clauses, or syntax (e.g., certain types of EXPLAIN, LOAD DATA INFILE) that are not yet implemented for execution within the prepared statement protocol.

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MariaDB Version Limitations

The specific MariaDB server version you are using may not have implemented support for preparing the given command or feature, even if it's supported in direct execution.

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Solutions

3 solutions available

1. Avoid Unsupported Commands in Prepared Statements easy

Rewrite queries to use only commands compatible with prepared statements.

1

Identify the specific SQL command causing the error. Common culprits include `SHOW VARIABLES`, `SHOW STATUS`, `USE database_name`, `FLUSH PRIVILEGES`, `KILL connection_id`, and certain DDL statements that are not fully supported in prepared statements.

2

If the unsupported command is essential, consider executing it directly outside of a prepared statement. For example, instead of `PREPARE stmt FROM 'USE my_database;'`, execute `USE my_database;` directly.

SET @db_name = 'my_database';
-- Instead of preparing and executing:
-- PREPARE stmt FROM CONCAT('USE ', @db_name);
-- EXECUTE stmt;

-- Execute directly:
USE my_database;

3

For DDL statements that are sometimes problematic, check MariaDB documentation for specific version support or consider executing them as separate, non-prepared statements. For example, `ALTER TABLE` statements can sometimes have limitations.

-- Example of a potentially problematic DDL in prepared statements:
-- PREPARE stmt FROM 'ALTER TABLE my_table ADD COLUMN new_col INT';
-- EXECUTE stmt;

-- Execute directly:
ALTER TABLE my_table ADD COLUMN new_col INT;

2. Execute Unsupported Commands Directly easy

Run commands that are not compatible with prepared statements as regular SQL statements.

1

When you encounter Error 1295, it means the specific SQL statement you are trying to use within a prepared statement is not allowed. Most often, these are commands that affect the server's state or session rather than data manipulation.

2

Modify your application logic to execute these unsupported commands as standard SQL queries, not through the `PREPARE`, `EXECUTE`, and `DEALLOCATE PREPARE` sequence.

/* In your application code (e.g., Python with mysql.connector) */

# Instead of:
# cursor.execute("PREPARE stmt FROM 'SHOW VARIABLES LIKE "max_connections"';")
# cursor.execute("EXECUTE stmt")
# result = cursor.fetchall()

# Execute directly:
cursor.execute("SHOW VARIABLES LIKE 'max_connections'")
result = cursor.fetchall()

3

Common commands to handle this way include `SET NAMES`, `SET SESSION`, `USE database`, `SHOW DATABASES`, `SHOW TABLES`, `SHOW STATUS`, `SHOW VARIABLES`, `FLUSH PRIVILEGES`, and `KILL`.

-- Example for SET NAMES:
-- PREPARE stmt FROM 'SET NAMES utf8mb4';
-- EXECUTE stmt;

-- Execute directly:
SET NAMES utf8mb4;

3. Upgrade MariaDB Version medium

Update to a newer MariaDB version where support for prepared statements has been expanded.

1

Check the MariaDB release notes for your current version and subsequent versions. MariaDB continuously improves support for prepared statements.

SELECT VERSION(); -- To check current version

2

Consult the official MariaDB documentation for specific commands that were added to prepared statement support in different versions. For example, certain `SHOW` statements or DDL operations might have gained support over time.

https://mariadb.com/kb/en/prepared-statements/

3

Plan and execute a MariaDB upgrade. This typically involves backing up your databases, stopping the MariaDB service, installing the new version, and running the `mysql_upgrade` utility.

sudo systemctl stop mariadb
# Follow MariaDB documentation for your specific OS to install the new version
sudo mysql_upgrade -u root -p
sudo systemctl start mariadb

4

After upgrading, re-test your application to see if the previously unsupported commands now work correctly within prepared statements.

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Related Errors

5 related errors

MariaDB Error 1295: Unsupported Command in Prepared Statements