How Can Cursors Efficiently Iterate Through T-SQL Query Results and Execute Stored Procedures for Each Row?

Cursor-Based Iteration over T-SQL Query Results

When working with T-SQL scripts, it may be necessary to iterate through the results of a query and perform subsequent operations on each row. This article explores how to employ a CURSOR mechanism to loop over query results, enabling the execution of a designated stored procedure for each retrieved row.

To facilitate the loop, a CURSOR, represented by the variable "@getid," is established. It initiates an iterative process by retrieving rows from the "table" table, storing retrieved values in "@id" and "@name."

The WHILE loop evaluates the @@FETCH_STATUS variable, which indicates the status of the fetching operation. As long as the status remains 0, the loop continues, executing the "stored_proc" for each row using the retrieved "@id" and "@name" values. The "@otherVarName" parameter is consistently set to 'test.'

Once the loop has exhausted all rows, the CURSOR is closed using the CLOSE statement and deallocated using the DEALLOCATE statement.

This cursor-based approach provides a convenient and efficient method for iterating through query results and triggering specific actions based on each retrieved row, such as executing stored procedures with relevant parameters.

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