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Microsoft is conducting an online survey to understand your opinion of the Msdn Web site.If you choose to participate, the online survey will be presented to you when you leave the Msdn Web site. Too often I've seen such queries ran in long loops one at a time, which is very bad for performance (as I will show here) and sometimes equally bad for integrity (if the process is interrupted). Insertion of multiple rows comes about often in batch jobs, database migrations and handling table relationships.A naive approach, via PHP, would be to loop over the data to be inserted, inserting one row at a time.At 2560 rows inserted, it took the loop ~36 seconds to complete, yet the single query took just 0.14 seconds.
This comprehensive course from Kevin Skoglund helps developers learn the basics of PHP (including variables, logical expressions, loops, and functions), understand how to connect PHP to a My SQL database, and gain experience developing a complete web application with site navigation, form validation, and a password-protected admin area. If you omit the WHERE clause, all records in the table will be updated! The WHERE clause specifies which record(s) that should be updated.At 2560 rows inserted, the single query approach consumed ~800kb in memory, while the loop consumed just ~60kb.Since memory is much cheaper than CPU cycles and database connections, I'd usually opt for the single query approach.