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Description

This error indicates that MySQL encountered a problem within the SQL code of a trigger, but it couldn't identify the specific trigger by name. This typically occurs when a trigger's internal definition is corrupt or severely malformed, preventing the server from parsing its body.

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Error Message

Unknown trigger has an error in its body: '%s'

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Known Causes

3 known causes

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Corrupt Trigger Definition

The internal definition of a trigger in MySQL's system tables is corrupted or incomplete, making it unreadable by the server.

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Severely Malformed SQL

The SQL code within a trigger's body is so malformed or refers to non-existent objects that MySQL fails to parse it and identify the trigger.

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Metadata Inconsistency

Discrepancies exist between MySQL's data dictionary and the actual trigger definition, leading to an inability to correctly access the trigger's body.

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Solutions

3 solutions available

1. Inspect and Correct Trigger Syntax easy

Directly examine and fix invalid SQL syntax within the trigger's body.

1

Identify the specific trigger causing the error. The error message '%s' will often contain the trigger name or a part of its definition.

2

Retrieve the trigger's definition using SHOW CREATE TRIGGER.

SHOW CREATE TRIGGER your_trigger_name;

3

Carefully review the 'Statement' section of the output for syntax errors. Common mistakes include missing semicolons, incorrect keywords, undeclared variables, or invalid function calls. The '%s' in the error message might hint at the problematic part.

4

Correct the identified syntax errors. If you're unsure, test the corrected SQL statements in a separate SQL client before applying them to the trigger.

DELIMITER //
CREATE TRIGGER your_trigger_name
BEFORE INSERT ON your_table
FOR EACH ROW
BEGIN
  -- Corrected SQL statement here
  SET NEW.column_name = some_value;
END //
DELIMITER ;

5

Recreate the trigger with the corrected definition. Use DELIMITER to properly handle the trigger body's internal semicolons.

DELIMITER //
CREATE TRIGGER your_trigger_name
BEFORE INSERT ON your_table
FOR EACH ROW
BEGIN
  -- Your corrected SQL statements
END //
DELIMITER ;

2. Drop and Recreate the Trigger easy

Remove the problematic trigger and create it again with a verified definition.

1

Identify the trigger name from the error message or by querying the information schema.

SELECT TRIGGER_NAME FROM INFORMATION_SCHEMA.TRIGGERS WHERE EVENT_OBJECT_TABLE = 'your_table_name' AND EVENT_MANIPULATION = 'INSERT'; -- Adjust EVENT_MANIPULATION as needed (UPDATE, DELETE)

2

Drop the existing trigger.

DROP TRIGGER IF EXISTS your_trigger_name;

3

Carefully construct the CREATE TRIGGER statement, ensuring all SQL syntax within the trigger body is valid. It's recommended to write and test the trigger logic in a separate SQL editor first.

DELIMITER //
CREATE TRIGGER your_trigger_name
BEFORE INSERT ON your_table
FOR EACH ROW
BEGIN
  -- Valid SQL statements for your trigger logic
  -- Example: INSERT INTO audit_log (message) VALUES ('New row inserted');
END //
DELIMITER ;

4

Recreate the trigger with the validated definition.

DELIMITER //
CREATE TRIGGER your_trigger_name
BEFORE INSERT ON your_table
FOR EACH ROW
BEGIN
  -- Your validated SQL statements
END //
DELIMITER ;

3. Isolate and Test Trigger Logic Components medium

Break down complex trigger logic into smaller, testable parts to pinpoint the error.

1

Retrieve the full CREATE TRIGGER statement for the problematic trigger.

SHOW CREATE TRIGGER your_trigger_name;

2

Identify individual SQL statements or logical blocks within the trigger's BEGIN...END block.

3

Extract each statement or block and execute it independently in a SQL client against a test environment or with dummy data that mimics the trigger's context (e.g., using INSERT statements with specific values).

-- Example of testing a single statement:
-- Assume 'NEW.some_column' will hold a value from the INSERT
-- Test this statement in isolation:
SELECT some_function(NEW.some_column);

4

When an individual statement or block fails or produces an unexpected result, you've found the source of the error. Debug and correct that specific piece of logic.

5

Once all components are verified, reassemble the trigger definition and recreate it.

DELIMITER //
CREATE TRIGGER your_trigger_name
BEFORE INSERT ON your_table
FOR EACH ROW
BEGIN
  -- Verified SQL statement 1
  -- Verified SQL statement 2
END //
DELIMITER ;

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Related Errors

5 related errors

MySQL Error 1711: Unknown Trigger Body Error