


Dynamically Iterating Through Column Names in a MySQL Table
This question explores a method for iterating through column names in a MySQL table using a stored procedure written in native SQL. The goal is to obtain a list of column names and then execute a stored procedure based on each column name as a variable.
Retrieving Column Names
To retrieve column names from a MySQL table, use the SHOW COLUMNS FROM
Looping Through Column Names
Once the column names are retrieved, they can be stored in a loop using a cursor. A cursor is an iterator that enables traversing a result set row by row. Here's an example:
DECLARE col_names CURSOR FOR SELECT column_name FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name = 'tbl_name' ORDER BY ordinal_position;
This cursor selects the column names from the specified table, orders them by their position, and names the cursor col_names.
Executing a Loop
To iterate through the column names and execute a stored procedure, use the following loop:
SET i = 1; the_loop: LOOP IF i > num_rows THEN CLOSE col_names; LEAVE the_loop; END IF; FETCH col_names INTO col_name; //do whatever else you need to do with the col name SET i = i + 1; END LOOP the_loop;
This loop uses a FETCH statement to retrieve the next column name into a variable col_name. Inside the loop, any necessary actions based on the column name can be performed.
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