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Table 16-11. DataSet Creation Methods
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Description Copies the data structure (including tables, relationships, and constraints) into a new DataSet but doesn't copy any data Copy() Copies both the data structure and the data into a new DataSet GetChanges() Extracts only the modified rows and copies them into a new DataSet
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Method Clone()
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Managing a DataSet with a Data Adapter
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The simplest way to populate a DataSet from a database that's accessible via an ADO.NET Data Provider is to use a Data Adapter. A Data Adapter is defined by the System.Data.IDbDataAdapter interface; all complete Data Provider implementations should provide a Data Adapter implementation. As well as populating the DataSet, the Data Adapter contains functionality to simplify the ongoing synchronization of data between the DataSet and the database. Table 16-12 summarizes the members of IDbDataAdapter. Consult the .NET documentation for complete details.
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Table 16-12. Members of IDbDataAdapter
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Member Properties DeleteCommand
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Description Gets or sets an IDbCommand used for deleting records from the underlying database.
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16. Database Connectivity
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InsertCommand
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Gets or sets an IDbCommand used for inserting records into the underlying database. Gets or sets an IDbCommand used for selecting records from the SelectCommand underlying database. Gets or sets an IDbCommand used for updating records in the UpdateCommand underlying database. MissingMappingAction Determines how the Data Adapter handles data from the data source that doesn't have a matching table or column in the DataSet. MissingSchemaAction Determines how the Data Adapter handles schema information coming from the data source that is different from the DataSet. Determines how source tables are mapped to DataTable instances in TableMappings the DataSet. Members Executes the IDbCommand contained in the SelectCommand property Fill() and fills the DataSet with the results. Executes the IDbCommand contained in the SelectCommand property FillSchema() and builds the relational structure of the DataSet without populating it with data. The Data Adapter inspects each row of the specified DataSet to Update() determine whether changes have occurred. The appropriate IDbCommand held in the InsertCommand, UpdateCommand, or DeleteCommand property is used to apply the changes to the database. Updates from the database are read and integrated into the DataSet. The following example demonstrates the population of a DataSet from the people table (used earlier in this chapter) using a SqlDataAdapter. The name, age, and sex fields of the records in the people table are read and copied into a DataTable named People, which is automatically created in the DataSet.
using System; using System.Data; using System.Data.SqlClient; public class DataSetDemo { // Private field to hold the SQL Server Name private static string sqlServerName = "MySqlServer"; public static void Main() { // Create a connection to the specified SQL Server using // a database named MyDatabase and integrated Windows security string conStr = "Data Source=" + sqlServerName + " ; Database=MyDataBase;" + " Integrated Security=SSPI"; SqlConnection sqlCon = new SqlConnection(conStr); // Create a Data Adapter SqlDataAdapter sqlAdapter = new SqlDataAdapter(); sqlAdapter.SelectCommand = sqlCon.CreateCommand();
16. Database Connectivity sqlAdapter.SelectCommand.CommandText = "SELECT name, age, sex FROM people"; // Create and populate the DataSet DataSet myDataSet = new DataSet("MySampleDataSet"); sqlAdapter.Fill(myDataSet, "People"); // Dump the contents of the DataSet to the console Console.WriteLine(myDataSet.GetXml()); } }
We'll discuss the DataSet.GetXml method later, in the "XML Support" section; we're using it now as a simple mechanism to dump the contents of the DataSet in a human-readable form. If the DBDemo example from the "Data Providers" section of this chapter is modified so that it doesn't delete all records from the people table, running the preceding code after running DBDemo will produce the following output:
<MySampleDataSet> <People> <name>Bob</name> <age>32</age> <sex>male</sex> </People> <People> <name>Fred</name> <age>28</age> <sex>male</sex> </People> <People> <name>Betty</name> <age>43</age> <sex>female</sex> </People> </MySampleDataSet>
Note in this example that we don't explicitly open or close the database connection. If the connection is closed when the Fill, FillSchema, or Update method is called, the Data Adapter will automatically open and close the connection. If the connection is already open, the connection's state will not be changed.
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