OdbcDataAdapter.DeleteCommand Property

Definition

Namespace:

System.Data.Odbc

Assembly:

System.Data.Odbc.dll

Package:

System.Data.Odbc v9.0.2

Source:

OdbcDataAdapter.cs

Gets or sets an SQL statement or stored procedure used to delete records in the data source.

C#

public System.Data.Odbc.OdbcCommand? DeleteCommand { get; set; }

Property Value

OdbcCommand

An OdbcCommand used during an update operation to delete records in the data source that correspond to deleted rows in the DataSet.

Examples

The following example creates an OdbcDataAdapter and sets the SelectCommand and DeleteCommand properties. It assumes that you have already created an OdbcConnection object.

C#

public static OdbcDataAdapter CreateDataAdapter(
    OdbcConnection connection)
{
    string selectCommand =
        "SELECT CustomerID, CompanyName FROM Customers";

    OdbcDataAdapter adapter = new OdbcDataAdapter(
        selectCommand, connection);
    adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;

    // Create the Insert, Update and Delete commands.
    adapter.InsertCommand = new OdbcCommand(
        "INSERT INTO Customers (CustomerID, CompanyName) " +
        "VALUES (?, ?)");

    adapter.UpdateCommand = new OdbcCommand(
        "UPDATE Customers SET CustomerID = ?, CompanyName = ? " +
        "WHERE CustomerID = ?");

    adapter.DeleteCommand = new OdbcCommand(
        "DELETE FROM Customers WHERE CustomerID = ?");

    // Create the parameters.
    adapter.InsertCommand.Parameters.Add("@CustomerID",
        OdbcType.Char, 5, "CustomerID");
    adapter.InsertCommand.Parameters.Add("@CompanyName",
        OdbcType.VarChar, 40, "CompanyName");

    adapter.UpdateCommand.Parameters.Add("@CustomerID",
        OdbcType.Char, 5, "CustomerID");
    adapter.UpdateCommand.Parameters.Add("@CompanyName",
        OdbcType.VarChar, 40, "CompanyName");
    adapter.UpdateCommand.Parameters.Add("@oldCustomerID",
        OdbcType.Char, 5, "CustomerID").SourceVersion =
        DataRowVersion.Original;

    adapter.DeleteCommand.Parameters.Add("@CustomerID",
        OdbcType.Char, 5, "CustomerID").SourceVersion =
        DataRowVersion.Original;

    return adapter;
}

Remarks

When the DeleteCommand property is assigned to a previously created OdbcCommand, the OdbcCommand is not cloned. Instead, the DeleteCommand maintains a reference to the previously created OdbcCommand.

During an update operation, if DeleteCommand is not set and primary key information is present in the DataSet, you can use the OdbcCommandBuilder class to automatically generate the DeleteCommand, and additional commands needed to reconcile the DataSet to the data source. To do this, set the SelectCommand property of the OdbcDataAdapter. The generation logic also requires key column information to be present in the DataSet. For more information, see Generating Commands with CommandBuilders.

Applies to

See also

• DataAdapters and DataReaders