OdbcDataAdapter Class
Represents a set of data commands and a connection to a data source that are used to fill the DataSet and update the data source. This class cannot be inherited.
Assembly: System.Data (in System.Data.dll)
The OdbcDataAdapter serves as a bridge between a DataSet and data source for retrieving and saving data. The OdbcDataAdapter provides this bridge by using Fill to load data from the data source into the DataSet, and using Update to send changes made in the DataSet back to the data source.
When the OdbcDataAdapter fills a DataSet, it creates the required tables and columns for the returned data if they do not already exist. However, primary key information is not included in the implicitly created schema unless the MissingSchemaAction property is set to AddWithKey. You may also have the OdbcDataAdapter create the schema of the DataSet, including primary key information, before filling it with data using FillSchema. For more information, see Adding Existing Constraints to a DataSet (ADO.NET).
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When you call the Fill method on a data source that does not have a primary key column, the OdbcDataAdapter tries to promote the unique constraint column to the primary key. In the process, the OdbcDataAdapter marks the unique constraint as not nullable. This behavior works unless there is a null value in the unique constraint column. If there is a null value, the Fill method fails with a constraint violation. To avoid this situation, do not allow null values in the unique constraint column. |
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Due to the limitations of native ODBC drivers, only one DataTable is ever returned when you call FillSchema. This is true even when executing SQL batch statements from which multiple DataTable objects would be expected. |
The OdbcDataAdapter also includes the SelectCommand, InsertCommand, DeleteCommand, UpdateCommand, and TableMappings properties to facilitate loading and updating of data.
The following example uses OdbcCommand, OdbcDataAdapter, and OdbcConnection to select records and populate a DataSet with the selected rows.
Public Function GetDataSetFromAdapter( _ ByVal dataSet As DataSet, ByVal connectionString As String, _ ByVal queryString As String) As DataSet Using connection As New OdbcConnection(connectionString) Dim adapter As New OdbcDataAdapter(queryString, connection) ' Open the connection and fill the DataSet. Try connection.Open() adapter.Fill(dataSet) Catch ex As Exception Console.WriteLine(ex.Message) End Try ' The connection is automatically closed when the ' code exits the Using block. End Using Return dataSet End Function
System.MarshalByRefObject
System.ComponentModel.Component
System.Data.Common.DataAdapter
System.Data.Common.DbDataAdapter
System.Data.Odbc.OdbcDataAdapter
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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