Stored procedure with dynamic SQL insert failing

Data and Databases
1

Hey everyone,

I’m stuck with a stored procedure that’s supposed to do a dynamic SQL insert. It’s not working as expected. Here’s what I’ve got:

CREATE PROCEDURE InsertDynamically (
    IN data TEXT,
    IN separator VARCHAR(10),
    IN col_name VARCHAR(10),
    IN col_value VARCHAR(10)
)
BEGIN
    SET @column = col_name;
    SET @value = col_value;

    SET @query = CONCAT('INSERT INTO DynamicTable (', @column, ') VALUES (', @value, ')');

    PREPARE stmt FROM @query;
    EXECUTE stmt;
    DEALLOCATE PREPARE stmt;
END

The procedure takes in some parameters and attempts to build a dynamic INSERT statement. However, when I execute it, nothing seems to happen. No error messages; it just silently fails. Has anyone encountered this before or seen a potential solution?

2

have u checked if data is passed properly? sometimes the call might be faulty. also, wrap string values in quotes. try: SET @query = CONCAT(‘INSERT INTO DynamicTable (’, @column, ‘) VALUES ("’, @value, ‘")’); && see if that fixes it.

3

I’ve encountered similar issues with dynamic SQL in stored procedures. One potential problem could be data type mismatches. Your procedure is treating all inputs as strings, which might not work for non-string columns. Try using CAST or CONVERT to ensure proper data type handling.

Another thing to check is permissions. Make sure the user executing the procedure has INSERT privileges on the target table. Also, consider adding error handling to capture and log any issues that might occur during execution.

Lastly, have you verified that the generated SQL statement is correct? You could add a SELECT statement to output @query before executing it, helping you debug the constructed query. This approach has saved me countless hours of troubleshooting in the past.