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ADO.NET Cookbook by Bill Hamilton

By Bill Hamilton

Deals 153 ideas, entire with code and factors, to difficulties normally encountered whilst utilizing ADO.NET to aid info entry in loosely coupled n-tier software architectures. The ideas show find out how to hook up with information resources from ADO.NET, retrieve information utilizing SQL statements, look for documents in perspectives and tables, replica info among ADO.NET sessions, bind facts to varieties, and enhance program functionality. The code examples are written in C#.

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6. The new Profiler window will display a table containing Audit Login events when connections are established and Audit Logout events when connections are closed. 2 Windows Performance Monitor To use the Windows Performance Monitor to monitor connection pooling: 1. Start Performance Monitor by selecting Start All Programs Administrative Tools Performance. 2. Add performance counters to monitor connection pooling with one of the following methods: ♦ Right-click the graph and select Add Counters from the popup menu.

NET Framework data types. NET Framework data types as well as the DataReader type accessors for each. 61 62 The DataAdapter can map table and column names in the database to tables and columns with different names in a DataTable. This allows the application to use different column and table names than are used by the database. The DataAdapter automatically maps names when retrieving and updating data. 16 demonstrates table and column mapping. A variety of error information is available when a DataAdapter fails while updating data.

This is done by calling either the Close( ) or Dispose( ) method of the Connection. Connections that are not explicitly closed might not be added to or returned to the connection pool. The DataAdapter automatically opens and closes a Connection as required if it is not already open when a method such as Fill( ), FillSchema( ), or Update( ) is called. The Connection must be explicitly closed if it is already open prior to the DataAdapter operation. NET Framework data providers. NET data providers for SQL Server and Oracle provide efficient, transaction-aware support for connection pooling.

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