Trouble with inserting data using dynamic SQL in stored procedure

Data and Databases
1

Hey everyone, I’m having a hard time getting my stored procedure to work. It’s supposed to use dynamic SQL for inserting data, but something’s not right. Here’s what I’ve got:

CREATE PROCEDURE InsertDynamically (
    IN data TEXT,
    IN separator VARCHAR(10),
    IN targetColumn VARCHAR(10),
    IN insertValue VARCHAR(10)
)
BEGIN
    DECLARE colName VARCHAR(50);
    DECLARE valToInsert VARCHAR(50);

    SET colName = targetColumn;
    SET valToInsert = insertValue;

    SET @queryString = CONCAT('INSERT INTO DynamicTable (', colName, ') VALUES (', valToInsert, ')');

    PREPARE dynStmt FROM @queryString;
    EXECUTE dynStmt;
    DEALLOCATE PREPARE dynStmt;
END

When I try to run it, nothing happens. No error, but no data gets inserted either. Any ideas what I’m doing wrong? Thanks in advance for your help!

2

yo, have u checked ur user privileges? sometimes the db won’t let u insert stuff if u don’t have the right permissions. also, maybe try adding some error handling to catch any silent fails. could help pinpoint the issue. good luck with it, mate!

3

I’ve encountered similar issues with dynamic SQL in stored procedures. One potential problem might be that the insertValue isn’t enclosed in quotes. If the value is a string, failing to enclose it could lead to SQL errors that occur silently.

Try modifying your CONCAT statement as follows:

SET @queryString = CONCAT('INSERT INTO DynamicTable (', colName, ') VALUES ("', valToInsert, '")');

Also, ensure that you’re passing all required parameters correctly when calling the procedure and consider adding error handling to catch any SQL errors. Finally, verify your permissions to confirm you have rights to insert data into the table.

4

hm, interesting procedure! have u tried printing out the @queryString before executing it? that might give u a clue whats going wrong. also, r u sure the DynamicTable exists and has the right column names? sometimes its the little things that trip us up :sweat_smile: keep us posted on what u find!