primary key and foreign key delete

Question

i make a form with primary key and foreign key when i delete data it show exception but i want it show in label how to do this?

Pankaj Kumar Choudhary · Answer

Hello @Rawat best method is that you should use exception handling in SQL SERver. if you want to show message in label then first use a variable and use this variable to store the error throw by system after that you can retrieve value from this variable and show into table Demo: Declare @val1 int; Declare @val2 int; DECLARE @msg [nvarchar](max); BEGIN TRY Set @val1=8; Set @val2=@val1/0; /* you can put your deletion code here */ END TRY BEGIN CATCH SET @msg= Error_Message(); SELECT @msg; /* retrieve value from this variable */ END CATCH If you have any doubt then please ask.........

Sujeet Suman · Answer

Pankaj has explained it really nicely.

Pankaj Kumar Choudhary · Answer

This is my pleasure that i helped you. If you have any problem related to Sql then please ask me i will give my 100% and try to solve problems Thanks..........

Rawat · Answer

this way is right. i also get a solution try and catch in catch part use labeland show message thanks for your response for the future i need your help .

Gohil Jayendrasinh · Answer

You can do this using CASCADE DELETE If a record in the parent table is deleted, then the corresponding records in the child table will automatically be deleted. This is called a cascade delete in SQL Server. Drop the existing foreign key constraint, Add a new one with the ON DELETE CASCADE setting enabled. ALTER TABLE dbo.T2 DROP CONSTRAINT FK_T1_T2 -- or whatever it's called ALTER TABLE dbo.T2 ADD CONSTRAINT FK_T1_T2_Cascade FOREIGN KEY (EmployeeID) REFERENCES dbo.T1 (EmployeeID) ON DELETE CASCADE Than DELETE FROM dbo.T2 WHERE EmployeeID = 1052014

primary key and foreign key delete

Answers (5)