How can I insert one value four table same time

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hi i read too many forums but ididnt it
How can i insert one value four table in same time same insert code

What I have tried:

cn.Open()
        'cmd.CommandText = "INSERT INTO T1 (Id) VALUES 111;INSERT INTO T2 (Id) VALUES 111";
        Dim STR1 = "INSERT INTO PERTM001(TCNO)  VALUES(" & TCNO.Text & ") ,INSERT INTO PERTM001(TCNO)  VALUES(" & TCNO.Text & ") "
        Dim Comm As New OleDbCommand(STR1, cn)
        Comm.CommandText = STR1
        Comm.ExecuteNonQuery()

Posted 8-Mar-20 5:30am

Member 14588284

Updated 8-Mar-20 5:38am

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OriginalGriff · Answer 1 · 2020-03-08T05:38:00

Not like that! Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Always use Parameterized queries instead.

When you concatenate strings, you cause problems because SQL receives commands like:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood'

The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. If I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable;--'

Which SQL sees as three separate commands:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';

A perfectly valid SELECT

SQL

DROP TABLE MyTable;

A perfectly valid "delete the table" command

SQL

--'

And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.

So ALWAYS use parameterized queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don't you?

And if you are going to try and do multiple inserts, I'd strongly recommend you look at using a Transaction: OleDbTransaction Class (System.Data.OleDb) | Microsoft Docs[^]