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Table 8.3 (continued) DEFAULT 8192 DESCRIPTION Size in bytes of the network packets used to communicate with an instance of SQL Server. When set to false, security-sensitive information, such as the password, is not returned as part of the connection if the connection is open or has ever been in an open state. Resetting the connection string resets all connection string values, including the password. When true, the SQLConnection object is drawn from the appropriate pool, or if necessary is created and added to the appropriate pool. User s password. The SQL Server Mixed Mode login account to use. Local computer name The name of the workstation connecting to SQL Server.
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This connects to the default instance of SQL Server on a computer called remoteComputer using Windows Authentication and connecting to the pubs database.
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Sql Server Dim cnstr as string = server=remoteComputer; cnstr &= user id=glenn;password=hello;database=pubs
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This connects to the default instance of SQL Server on a computer called remoteComputer using a SQL Server account called glenn with a password of hello and connecting to the pubs database.
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Sql Server Dim cnstr as string = server=.; Cnstr &= timeout=30; cnstr &= uid=glenn;pwd=hello;database=pubs
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Sql Server Dim cnstr as string = server=GJ\PortalSite; cnstr &= integrated security=true;database=portal
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This connects to the PortalSite instance of SQL Server on a computer called GJ using a SQL Server Windows Authentication and connecting to the portal database. Creating, Opening, Closing, and Destroying a Connection In the previous section, many ConnectionString samples were presented. Now it s time to create and open a connection. A connection can be created as follows:
Dim cnstr as string = integrated security=true;database=northwind Dim cn as new SqlConnection(cnstr) cn.Open( ) Do lots of data access here. cn.Close( ) can be reopened and closed here cn.Dispose( ) cn=nothing
The first lines of code create a SqlConnection object using the specified ConnectionString and then open the connection. The ConnectionString could have been assign by using the ConnectionString property of cn as well. After the connection has been opened, many commands may be executed over the connection. When finished, the connection can be closed, disposed, and assigned to nothing. See the accompanying Close versus Dispose sidebar for related details. Exception Handling When working with connection objects, it is usually advisable to place their code into an exception handling routine, since breaks in communication can cause application crashes. The previous code has been modified to reflect changes to handle any error that may occur, as follows:
Dim cn As New SqlConnection() Dim cnstr as string = _ server=asd;integrated security=yes;database=northwind Try cn.ConnectionString = cnstr cn.Open() Try to connect to nonexistent server. lots of data access stuff here Catch ex As SqlException Dim myErrors As SqlErrorCollection = ex.Errors Dim eItem As SqlError For Each eItem In myErrors
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Response.Write( _ String.Format( Class: {0}<br> , eItem.Class)) Response.Write( _ String.Format( _ Error #{0}: {1} on line {2}.<br> , _ eItem.Number, eItem.Message, eItem.LineNumber)) Response.Write( _ String.Format( {0} reported Error connecting to {1}<br> , _ eItem.Source, eItem.Server)) Response.Write( _ String.Format( Nothing was written to database.<br> )) Next Catch Throw the previous exception to the caller. Throw Finally cn.Dispose() cn = Nothing End Try
This book will not use the try/catch block in each example to keep focused on the subject at hand. Using a try/catch block is the recommended method of opening a connection and performing data access in a production environment.
In the previous code, the cn had to be declared outside the try block because variables that are declared inside the try block only live within the try block. Since the Finally block needs to access cn, cn s declaration was outside of the try block. When a SqlException takes place, the exception will be caught. There is only one .NET exception for any SQL Server exception, but looping through the Errors collection of the SqlException will reveal more details about the type of SqlErrors that took place. If the exception was not a SqlException, the Exception is simply thrown to the caller. The Finally block of code will execute regardless of whether or not an exception occurred. This is especially important in situations where the exception is being thrown to the caller, because the Finally block will even execute in this case, just prior to throwing the exception to the caller.