c# print 2d barcode Advanced Query Topics in .NET framework

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Estimated lesson time: 45 minutes
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Multiple Active Result Sets is a new feature introduced with SQL Server 2005 that enables you to execute multiple statements through a single connection. MARS uses a connection attribute to indicate whether the connection can support this type of processing. Prior to this capability, you had to complete one batch before another one could be started. MARS enables you to execute one or more statements as you loop through the results of a separate result set all within the same connection. You might be thinking that MARS enables you to perform asynchronous or parallel processing, but this is not true. MARS enables you to interleave multiple result sets while the default result set remains open. MARS addresses a specific concern among developers that would receive transaction isolation level locks in their applications. MARS avoids this locking by enabling you to have multiple SqlDataReaders open on a single connection. In situations where transactions are used and multiple result sets must be processed, MARS can avoid the locking that might occur. MARS is ideal for a situation where you need to perform some operation as a set of results being read. For example, consider the following pseudo code, which is code represented as real English:
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Execute SELECT statement and return results to a DataReader Loop through the DataReader Perform UPDATE to data from the table in the SELECT statement End Loop
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MARS is not a good idea when you have results that will be processed slowly. This can happen when the processing is dependent on user interaction or the processing of some external process. It might take a long time for the processing to occur, and this could cause an unnecessary performance penalty when using MARS. In these cases, using a server-side cursor would be a better alternative. Upon learning about MARS, do not be tempted to convert all existing server-side cursors to use MARS. It might be possible that the server-side cursor is still the faster alternative. The lab in this lesson will demonstrate that a server-side cursor is several times faster than the MARS alternative. MARS was not intended to provide a performance advantage; it simply provides another option for developers and enables them to avoid problems with locking.
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Using MARS
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MARS can be utilized with the SQL Native Client Provider or with the SqlClient for the .NET Provider. For more information about the SQL Native Client Provider, refer to Lesson 1, Designing Data Access Technologies in 1, Designing a Data Access Strategy. By default, MARS is not enabled, so you will have to enable it specifically. The following lists how it is enabled with each provider:
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SQL Native Client using the OLEDB Provider MARS is enabled through the SSPROP
_INIT_MARSCONNECTION property from the DBPROPSET_SQLSERVERDBINIT property set. Alternatively, you can include the MarsConn=yes/no keyword in the connection string if you are using the SQL Native Client through ADO. The code that specifies the connection string would look similar to the following:
//C# ADODB.Connection conn = new ADODB.Connection(); String connStr = "Provider=SQLNCLI;" + @"Server=.\SQL2005STD;" + "Database=AdventureWorks;" + "Integrated Security=SSPI;" + "DataTypeCompatibility=80;" + "MarsConn=yes;"; conn.Open(connStr, null, null, 0); //Do some processing conn.Close(); 'VB Dim conn As New ADODB.Connection Dim connStr As String = "Provider=SQLNCLI;" + _ "Server=.\SQL2005STD;" + _ "Database=AdventureWorks;" + _ "Integrated Security=SSPI;" + _ "DataTypeCompatibility=80;" + _ "MarsConn=Yes;" conn.ConnectionString = connStr conn.Open() 'Do some processing conn.Close()
SQL Native Client using the ODBC Provider MARS is enabled through the SQLSetCon-
nectAttr and SqlGetConnectAttr functions. Alternatively, you can set include the MARS CONNECTION=true/false keyword in the connection string if you are using the SQL Native Client through ADO. The code that specifies the connection string would look similar to the following:
//C# ADODB.Connection conn = new ADODB.Connection(); String connStr = "Provider=SQLNCLI;" + @"Server=.\SQL2005STD;" +
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