How to handle exceptions in SQL Server?

To handle exceptions in SQL Server we can use TRY…… CATCH blocks. To use TRY…… CATCH blocks in stored procedure we need to write the query like as shown below

 

BEGIN TRY

—Write Your Code

END TRY

BEGIN CATCH

—Write Code to handle errors

END CATCH

In TRY block we will write our queries and in CATCH block we will write code to handle exceptions. In our SQL statements if any error occurs automatically it will move to CATCH block in that we can handle error messages. To handle error messages we have defined Error Functions in CATCH block those are

ERROR_LINE() – This function will return error line number of SQL query which cause to raise error.

ERROR_NUMBER() – This function will return error number which is unique and assigned to it.

ERROR_SEVERITY() – This function will return severity of error which indicates how serious the error is. The values are between 1 and 25.

ERROR_STATE() – This function will return state number of error message which cause to raise error.

ERROR_PROCEDURE() – This function will return name of the procedure where an error occurred.

ERROR_MESSAGE() – This function will return the complete text of the error message which cause to raise error.

Check below sample query to handle errors in stored procedure

BEGIN TRY

SELECT 300/0

END TRY

BEGIN CATCH

SELECT ErrorNumber = ERROR_NUMBER(), ErrorSeverity = ERROR_SEVERITY(), ErrorState =ERROR_STATE(),

ErrorProcedure = ERROR_PROCEDURE(), ErrorLine = ERROR_LINE(), ErrorMessage =ERROR_MESSAGE()

END CATCH

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