Bind variables are placeholders inside a SQL statement.
When a database receives a SQL statement, it determines if the statement has already been executed and stored in memory.
I am writitng a program that uses a database as the backend and visual basic for the gui.
I have created a table in the ms sql express that a user can pick from and record to.
This is my code so far: Dim cn As New Sql Connection("Data Source=.\SQLEXPRESS; Attach Db Filename=|Data Directory|\Student ODPLog Book.mdf; Integrated Security=True; Connect Timeout=30; User Instance=True") Dim cmd As New Sql Command 'insert SQL command' cmd. Text) 'Open connection ,execute sql command and close connection' cn.
Command Text = "Insert Into Operations Table (Operation Name, Operation Id) Values (@Operation Name,5)" 'Takes the text box data as the parameter to be stored in the dataset' cmd. Open() 'cmd Builder = New Sql Command Builder(Sql Data Adapter1) cmd.
In this section, you will add a button that enables client data changes to be saved back to the database.
Using bind variables also improves query performance in the database, eliminates the need for special handling of literal quotation marks in the input, and protects against SQL injection attacks.
The following code shows a typical contains a client copy of the database data.