Visual Basic Sql Code Example
This time let’s start adding code to “Open Connection” button. To add code, just double click this button. Then we need to add the MySQLConnection object under Public class. It will look like the code below.
To read and write information to and from aSQL Server database, it is necessary first to establish a connectionto the database. This is done with theSqlConnection object, found in theSystem.Data.SqlClient namespace.Here’s an example:
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This code fragment instantiates an object of type SqlConnection,passing its constructor a connection string. Calling theSqlConnection object’s Open method opens the connection. Aconnection must be open for data to be read or written, or forcommands to be executed. When you’re finished accessing thedatabase, use the Close method to close the connection:
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The connection string argument to the SqlConnection class’sconstructor provides information that allows the SqlConnection objectto find the SQL Server database. The connection string shown in theearlier code fragment indicates that the database is located on thesame machine that is running the code snippet(DataSource=localhost), thatthe database name is Northwind (InitialCatalog=Northwind), and that the user ID thatshould be used for logging in to SQL Server is the current Windowslogin account (Integrated Security=True). Table 8-1 shows the valid SQL Server connection stringsettings.
Visual Basic Sql Connection
Table 8-1. ..