How to Execute a Stored Procedure for Each Row Returned by a Query Using Cursors?

Each line of the concentration of the query results is used to perform the storage procedure

In the database operation, you may need to perform a storage procedure on each line returned to the query. The cursor provides an effective method to iterate the results and perform the storage procedure accordingly.

The cursor is a temporary database structure that allows you to save the results of the query and traverse them one by one. To use a cursor to perform a storage procedure for each line, please follow the steps below:

Create a cursor:

Use the
1. statement to declare a campaign, specify the query that will return to the process of processing. Open the cursor: DECLARE Use the
statement to initialize the campaign and make the content for processing.
2. Extraction: Use OPEN to retrieve the first line from the cursor. You can store the returned data into the variable for later use.
3. Execute the storage procedure: In the cycle, check whether there are more lines that need to be processed (FETCH NEXT). If so, call the storage procedure and pass the necessary parameters.
4. Close the campaign: Once all the lines have been processed, use the statement to release the cursor and release memory. WHILE @@FETCH_STATUS = 0
The following is an example of using a cursor in MS SQL:
5. Remember, the cursor may be slower than the set of operations. For large data sets, it is recommended to consider optimizing the process or manual iteration results. CLOSE

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