The CData ADO.NET Provider for PostgreSQL implements standard ADO.NET data access components that can be used with third-party controls. The standard ADO.NET process for databinding can be followed to enable bidirectional access to live data from UI controls. In this article we show how to use the CData components to databind to the DevExpress Windows Forms and Web controls; you will databind to a chart that displays current data.
PostgreSQL への接続には、Server、Port（デフォルトは5432）、Database、およびUser、Password のプロパティを設定します。Database プロパティが設定されない場合には、User のデフォルトデータベースに接続します。
The code below shows how to populate a DevExpress chart with PostgreSQL data. The PostgreSQLDataAdapter binds to the Series property of the chart control. The Diagram property of the control defines the x- and y-axes as the column names.
using (PostgreSQLConnection connection = new PostgreSQLConnection(
"User=postgres;Password=admin;Database=postgres;Server=127.0.0.1;Port=5432;")) {
PostgreSQLDataAdapter dataAdapter = new PostgreSQLDataAdapter(
"SELECT ShipName, ShipCity FROM Orders", connection);
DataTable table = new DataTable();
dataAdapter.Fill(table);
DevExpress.XtraCharts.Series series = new DevExpress.XtraCharts.Series();
chartControl1.Series.Add(series);
series.DataSource = table;
series.ValueDataMembers.AddRange(new string[] { "ShipCity" });
series.ArgumentScaleType = DevExpress.XtraCharts.ScaleType.Qualitative;
series.ArgumentDataMember = "ShipName";
series.ValueScaleType = DevExpress.XtraCharts.ScaleType.Numerical;
chartControl1.Legend.Visibility = DevExpress.Utils.DefaultBoolean.False;
((DevExpress.XtraCharts.SideBySideBarSeriesView)series.View).ColorEach = true;
}
The code below shows how to populate a DevExpress Web control with PostgreSQL data. The PostgreSQLDataAdapter binds to the Series property of the chart; the Diagram property defines the x- and y-axes as the column names.
using DevExpress.XtraCharts;
using (PostgreSQLConnection connection = new PostgreSQLConnection(
"User=postgres;Password=admin;Database=postgres;Server=127.0.0.1;Port=5432;"))
{
PostgreSQLDataAdapter PostgreSQLDataAdapter1 = new PostgreSQLDataAdapter("SELECT ShipName, ShipCity FROM Orders", connection);
DataTable table = new DataTable();
PostgreSQLDataAdapter1.Fill(table);
DevExpress.XtraCharts.Series series = new Series("Series1", ViewType.Bar);
WebChartControl1.Series.Add(series);
series.DataSource = table;
series.ValueDataMembers.AddRange(new string[] { "ShipCity" });
series.ArgumentScaleType = ScaleType.Qualitative;
series.ArgumentDataMember = "ShipName";
series.ValueScaleType = ScaleType.Numerical;
((DevExpress.XtraCharts.SideBySideBarSeriesView)series.View).ColorEach = true;
}
