Error
Error Code:
1318
MySQL Error 1318: Mismatched Routine Argument Count
Description
Error 1318 occurs when invoking a stored procedure, function, or trigger with an incorrect number of parameters. This typically happens when the caller provides more or fewer arguments than the routine's definition specifies, leading to a mismatch in the expected input signature.
Error Message
Incorrect number of arguments for %s %s; expected %u, got %u
Known Causes
3 known causesIncorrect Routine Invocation
The most common reason is calling a stored procedure or function directly with an argument count that doesn't match its defined signature.
Routine Definition Mismatch
The stored procedure or function's definition was altered (e.g., arguments added or removed) after existing code or other routines were written to call its original signature.
Nested Routine Call Error
A stored procedure, function, or trigger contains a call to another routine, and that nested call is passing an incorrect number of arguments.
Solutions
4 solutions available1. Verify Routine Definition and Call easy
Ensure the number of arguments in the routine's definition matches the number of arguments in the call.
1
Identify the routine (stored procedure or function) that is causing the error. The error message should specify its name.
2
Retrieve the definition of the routine from the MySQL server. Pay close attention to the number of parameters defined within the `CREATE PROCEDURE` or `CREATE FUNCTION` statement.
SHOW CREATE PROCEDURE routine_name;
SHOW CREATE FUNCTION routine_name;3
Examine the SQL statement where the routine is being called (e.g., `CALL routine_name(...)` or `SELECT routine_name(...)`). Count the number of arguments being passed.
CALL your_procedure_name(argument1, argument2, ...);
SELECT your_function_name(argument1, argument2, ...);4
Compare the number of defined parameters with the number of passed arguments. Adjust either the routine definition or the call to match.
2. Update Routine Definition with Correct Argument Count medium
Modify the stored procedure or function to accept the expected number of arguments.
1
Determine the correct number of arguments that should be passed to the routine. This might involve consulting documentation, reviewing other parts of the application, or understanding the routine's purpose.
2
Drop the existing routine.
DROP PROCEDURE IF EXISTS routine_name;
DROP FUNCTION IF EXISTS routine_name;3
Recreate the routine with the correct number of parameters. Ensure the data types of the parameters are also appropriate.
CREATE PROCEDURE routine_name(param1_name param1_type, param2_name param2_type, ...)
BEGIN
-- routine logic
END;
CREATE FUNCTION routine_name(param1_name param1_type, param2_name param2_type, ...)
RETURNS return_type
BEGIN
-- function logic
END;3. Adjust Routine Call to Match Argument Count easy
Modify the SQL statement that invokes the routine to pass the correct number of arguments.
1
Identify the SQL statement where the routine is being called.
2
Examine the routine's definition to understand how many arguments it expects and their order.
SHOW CREATE PROCEDURE routine_name;
SHOW CREATE FUNCTION routine_name;3
Modify the calling statement to pass the correct number of arguments. If an argument is not needed, remove it. If an argument is missing, add it with an appropriate value or `NULL` if allowed.
CALL your_procedure_name(argument1, argument2, ...); -- Corrected call
SELECT your_function_name(argument1, argument2, ...); -- Corrected call4. Review Application Code for Dynamic Routine Calls advanced
Check application code that dynamically constructs routine calls to ensure argument counts are handled correctly.
1
If your application code constructs SQL statements dynamically to call stored procedures or functions, carefully review the logic that determines the number of arguments passed.
2
Look for any conditional logic or data-driven mechanisms that might lead to an incorrect number of arguments being appended to the routine call string.
3
Implement robust validation or error handling within your application code to ensure that the generated SQL for routine calls always has the correct number of arguments.
4
Consider using parameterized queries or prepared statements provided by your programming language's database connector to avoid manual string concatenation and reduce the risk of such errors.