Скачать или смотреть how to implement Error Handling in SQL server

Error handling is an important aspect of programming, including SQL. In SQL, error handling is used to manage errors that can occur during the execution of SQL code. The main purpose of error handling in SQL is to handle exceptions and prevent the code from crashing.

Some common scenarios where error handling is useful in SQL are:

Invalid data: When invalid data is entered into the database, error handling can be used to catch the error and provide feedback to the user.
Constraint violations: When constraints are violated during data manipulation operations, error handling can be used to manage the error and prevent data corruption.
Deadlocks: When multiple users try to access the same resource simultaneously, deadlock errors can occur. Error handling can be used to manage these errors and prevent data loss.
Network issues: When there are network connectivity issues or server failures, error handling can be used to catch the errors and handle them appropriately.
To handle errors in SQL, developers can use the TRY...CATCH block. This block allows developers to write code that handles errors gracefully and provides feedback to the user. Within the TRY block, developers can include the code that might cause an error, while the CATCH block contains the code that handles the error. This way, developers can ensure that their SQL code can handle any errors that might occur during execution, and prevent the application from crashing.