help in seting the count query count query before insert query

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I have a query to assign roles t users

C#

MAcmd.CommandText = "INSERT INTO ROLES (UserId,GroupId) SELECT UserId,GroupId FROM Users, Groups WHERE username= '" + TextBox1.Text + "' AND rolename='" + TextBox2.Text + "'";

i want to implement count sql query so that the record not repeately save in
but i don't know how to do it in C#.
e.g i found a stored procedure..

e.g

SQL

SELECT @Count = Count(UserID) FROM UserRoles WHERE
        RoleID = @RoleID AND UserID = @UserID
IF @Count = 0
		INSERT INTO UserRoles(UserID, RoleID)
		VALUES(@UserID, @RoleID)

can anyone help me to write count query ...as above store procedure for my query.

Posted 7-Sep-11 23:32pm

codegeekalpha

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manoharank5 · Answer 1 · 2011-09-07T23:38:00

Solution 2

MAcmd.CommandText = SELECT Count(UserID) FROM UserRoles WHERE
RoleID = @RoleID AND UserID = @UserID"
MAcmd.ExecuteScalar()

Check the retun value of ExceuteScalar and execute the insert scripts

Posted 7-Sep-11 23:38pm

manoharank5

Abhijit Jana · Answer 2 · 2011-09-07T23:35:00

"INSERT INTO ROLES (UserId,GroupId) SELECT UserId,GroupId FROM Users, Groups WHERE username= '" + TextBox1.Text + "' AND rolename='" + TextBox2.Text + "'";

FYI, Please don't write code link this, This will create SQL Injection in your application. Use Command Parameter instead.
Just for your reference :
Introduction to SQL Injection[^]