How to Loop Through Rows in MySQL
November 9, 2023
Looping through rows in MySQL involves iterating over a result set obtained from a query. This is often used to process or manipulate each row individually.
Understanding cursors for row-by-row processing
Cursors in MySQL provide a way to iterate over a result set from a SELECT query. They are essential for row-by-row operations in stored procedures.
Opening and closing a cursor
Before using a cursor, you need to open it. Once processing is done, always ensure to close it to release resources.
Fetching rows with a cursor
The FETCH statement retrieves the next row from the cursor into variables.
Looping through rows using cursors
EXIT WHEN NOT FOUND to iterate through each row.
An example of row-by-row processing
Here’s a practical example demonstrating the whole process.
This guide presents the essentials of looping through rows in MySQL using cursors. Cursors provide a controlled way to handle data row by row, especially within stored procedures. Remember to always open and close cursors and handle the end of the data set gracefully.
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