When should I use transactions in my queries?

Question

I\'m reading very detailed tutorials on how to use transactions with database types and database engines, but I haven\'t found a guide that teaches me when and why I should

Answer 1

In some frameworks, e.g. Spring, automatic transactions allow to re-execute a transaction if it failed.

Answer 2

Transactions should be used when there is the possibility that either failure to complete or someone else reading or writing in the middle of your task could cause damage to the data. These include but are not limited to:

• Reading from a table for subsequent deletion
• Writing related data to multiple tables

Answer 3

Basically any time you have a unit of work that is either sensitive to outside changes or needs the ability to rollback every change, if an error occurs or some other reason.

Look here for some excellent answers and their reasons for using them.

Answer 4

You use transactions when you have a group of actions that must be atomic (either all succeed or none succeed) Wrapping these actions in a transaction allows you to rollback actions that have already succeeded when you encounter an error. It also ensures that the data you are working with is consistent as locks will be held until the transaction is complete.

Answer 5

In addition to what Nick Craver wrote, you would want to use a transaction when you have a series of writes that need to be performed atomically; that is, they should all succeed or none should succeed.