i can not performed delete query

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SQL-Server-2005

i cant performed delete query by using below code

VB

adp = New SqlDataAdapter("delete from tbl1 where no=" & TextBox1.Text & " ", cn)
        adp1 = New SqlDataAdapter("delete from tbl2 where no=" & TextBox1.Text & "", cn)

        cmd.ExecuteNonQuery()
        'cmd1.ExecuteNonQuery()
        adp.Fill(ds, "tbl1")
        cmd.ExecuteNonQuery()
        adp1.Fill(ds1, "tbl2")
        MsgBox("Record Deleted....")

error generate

The DELETE statement conflicted with the REFERENCE constraint "FK_tbl2_tbl1". The conflict occurred in database "two", table "dbo.tbl2", column 'no'. The statement has been terminated.

Posted 10-Feb-11 20:34pm

samir 2011

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Sunasara Imdadhusen · Answer 1 · 2011-02-10T20:40:00

Solution 1

You need to delete before all references (Records) from Child tables then delete from Master table.

Or you may refer following:

http://www.builderau.com.au/program/sqlserver/soa/SQL-basics-Deleting-from-child-tables/0,339028455,320269121,00.htm[^]

http://www.sqlteam.com/article/performing-a-cascade-delete-in-sql-server-7[^]

Thanks,
Imdadhusen

Posted 10-Feb-11 20:40pm

Sunasara Imdadhusen

Updated 10-Feb-11 20:42pm

v2

Comments

somil030 11-Feb-11 2:48am

thnx for ur best replying ...
will u explain me why should i delete all reference from child b4 master table

Sunasara Imdadhusen 11-Feb-11 3:06am

because your child b4 is referring to the parents table!

Wendelius · Answer 2 · 2011-02-10T20:55:00

As said you must delete the child rows first or the other possibility is to change the foreign key constraint to cascade the deletion from master table to child tables. You can use this approach if you want the database to always delete the children when master is deleted. See: Cascading Referential Integrity Constraints[^]