private DbDataAdapter GetDataAdapterClone(DbDataAdapter oldAdapter)
{
DbDataAdapter adapter =
DataAdapterUtil.GetDataAdapterClone(oldAdapter);
IDbCommand selectCommand = ((IDbDataAdapter)adapter).SelectCommand;
if (selectCommand == null ||
selectCommand.CommandText == null ||
selectCommand.CommandText.Length == 0)
{
MessageBox.Show("Adapter's SelectCommand is not configured",
"Generate " + DATASETNAME_PREFIX);
return(null);
}
IDbConnection connection = selectCommand.Connection;
if (connection == null ||
connection.ConnectionString == null ||
connection.ConnectionString.Length == 0)
{
MessageBox.Show("Adapter's SelectCommand.Connection is not configured",
"Generate " + DATASETNAME_PREFIX);
return(null);
}
return(adapter);
} // GetDataAdapterClone
/// <summary>
/// Reset button event handler.
/// Discard the existing mappings in the datagrid and
/// build a new set from the database.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void buttonReset_Click(object sender, System.EventArgs e)
{
if (this.dbAdapter == null)
{
System.Windows.Forms.MessageBox.Show(
"Data Adapter is null; Table mappings is not available.",
"Table Mappings");
return;
}
DataTableMappingCollection mapList = this.dbAdapter.TableMappings;
if (mapList == null)
{
System.Windows.Forms.MessageBox.Show(
"Data Adapter's Table mappings are null and are not available.",
"Table Mappings");
return;
}
System.Data.DataTable dt;
dt = TableMappings.BuildMapFromDatabase(
DataAdapterUtil.GetDataAdapterClone(this.dbAdapter));
textBoxDatasetTable.Text =
TableMappings.BuildDataSetNameFromCommand(this.dbAdapter);
dt.AcceptChanges();
this.dataGrid1.DataSource = dt;
} // buttonReset_Click
static internal bool Generate(DbDataAdapter origDbDataAdapter)
{
if (origDbDataAdapter == null)
{
return(false);
}
DbDataAdapter dbAdapter =
DataAdapterUtil.GetDataAdapterClone(origDbDataAdapter);
IDbDataAdapter dataAdapter = (IDbDataAdapter)dbAdapter;
IDbCommand dbCommand = dataAdapter.SelectCommand;
// safety check for a missing or incomplete Command
if (dbCommand == null ||
dbCommand.CommandText == null ||
dbCommand.CommandText.Trim().Length == 0)
{
return(false);
}
// safety check for a missing Connection
if (dbCommand.Connection == null)
{
return(false);
}
string cmdText = dbCommand.CommandText;
// make a schema table that the DbAdapter can fill in
DataTable dt;
// build the DataTable with the column mapping
dt = BuildMapFromDatabase(dbAdapter);
// move the mapping in the data table to adapter.TableMappings
Generate(
origDbDataAdapter, dt,
"Table", BuildDataSetNameFromCommand(cmdText));
return(true); // return with all went well
} // Generate