SqlGeometryDataAdapter.SqlText Property

Gets or sets the SQL query that will be used to select data from a SQL database.

Namespace: DevExpress.Xpf.Map

Assembly: DevExpress.Xpf.Map.v24.2.dll

NuGet Package: DevExpress.Wpf.Map

Declaration

C#

public string SqlText { get; set; }

VB.NET

Public Property SqlText As String

Property Value

Type	Description
String	A string value.

Example

This example shows how to load data from a SQL geometry source and save changes made to map shapes to the source.

Follow the steps below to load data from a SQL geometry data source:

1. Create a SqlGeometryDataAdapter object.
2. Specify its SqlGeometryDataAdapter.ConnectionString, SqlGeometryDataAdapter.SqlText and SqlGeometryDataAdapter.SpatialDataMember properties.
3. Assign this object to the VectorLayer.Data property.

Note that all field values loaded from the database (except for the SpatialDataMember field) are stored as attributes for each generated SqlGeometryItem object.

In this example, you can enable the Map Editor‘s Edit mode to relocate map shape points. To save changes made to shapes, call corresponding SQL commands in the MapEditor.MapItemEdited event handler.

XAML

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dxm="http://schemas.devexpress.com/winfx/2008/xaml/map"
        x:Class="SqlGeometryDataAdapterExample.MainWindow"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <dxm:MapControl x:Name="mapControl">
            <dxm:MapControl.MapEditor>
                <dxm:MapEditor MapItemEdited="MapEditor_MapItemEdited"/>
            </dxm:MapControl.MapEditor>
            <dxm:VectorLayer DataLoaded="VectorLayer_DataLoaded">
                <dxm:VectorLayer.ShapeTitleOptions>
                    <dxm:ShapeTitleOptions Pattern="{}{TextCol}"
                                           Visible="True"/>
                </dxm:VectorLayer.ShapeTitleOptions>
                <dxm:SqlGeometryDataAdapter SqlText = "SELECT [id],[GeomCol1],[TextCol] FROM [dbo].[DemoTable]" 
                                            SpatialDataMember = "GeomCol1" ConnectionString="{Binding}"/>
            </dxm:VectorLayer>
        </dxm:MapControl>
    </Grid>
</Window>

C#

using DevExpress.Xpf.Map;
using System;
using System.Data.SqlClient;
using System.IO;
using System.Windows;

namespace SqlGeometryDataAdapterExample {
    public partial class MainWindow : Window {

        const string filePath = "..\\..\\Data\\SQLG.mdf";
        static string fullFilePath = Path.GetFullPath(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, filePath));
        public string ConnectionString { get; } = @"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFileName=" + fullFilePath + ";Database=SqlGeometryDB;Integrated Security=True;MultipleActiveResultSets=True";

        public MainWindow() {
            InitializeComponent();
            this.DataContext = ConnectionString;
        }

        private void MapEditor_MapItemEdited(object sender, DevExpress.Xpf.Map.MapItemEditedEventArgs e) {
            foreach (MapPath path in e.Items) {
                int id = Convert.ToInt32(path.Attributes["id"].Value);
                string modified = path.ExportToWkt().ToString();
                path.Attributes["TextCol"].Value = "Australia" + " " + DateTime.Now.Second.ToString();

                using (SqlConnection cn = new SqlConnection() { ConnectionString = this.ConnectionString }) {
                    cn.Open();
                    // For more information about SRID parameters, see https://docs.microsoft.com/en-us/sql/t-sql/spatial-geography/stsrid-geography-data-type?view=sql-server-ver15
                    SqlCommand updatecmd = new SqlCommand("UPDATE DemoTable SET GeomCol1 = geometry::STGeomFromText('" + modified + "', 4326 ) WHERE id = " + id.ToString(), cn);
                    updatecmd.ExecuteNonQuery();

                    SqlCommand updateattr = new SqlCommand("UPDATE DemoTable SET TextCol = '" + path.Attributes["TextCol"].Value.ToString() + "' WHERE id =" + id.ToString(), cn);
                    updateattr.ExecuteNonQuery();
                }
            }
        }

        private void VectorLayer_DataLoaded(object sender, DataLoadedEventArgs e) {
            mapControl.ZoomToFitLayerItems();
        }
    }
}

VB.NET

Imports DevExpress.Xpf.Map
Imports System
Imports System.Data.SqlClient
Imports System.IO
Imports System.Windows

Namespace SqlGeometryDataAdapterExample
    Partial Public Class MainWindow
        Inherits Window

        Private Const filePath As String = "..\..\Data\SQLG.mdf"
        Private Shared fullFilePath As String = Path.GetFullPath(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, filePath))
        Public ReadOnly Property ConnectionString() As String = "Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFileName=" & fullFilePath & ";Database=SqlGeometryDB;Integrated Security=True;MultipleActiveResultSets=True"

        Public Sub New()
            InitializeComponent()
            Me.DataContext = ConnectionString
        End Sub

        Private Sub MapEditor_MapItemEdited(ByVal sender As Object, ByVal e As DevExpress.Xpf.Map.MapItemEditedEventArgs)
            For Each path As MapPath In e.Items
                Dim id As Integer = Convert.ToInt32(path.Attributes("id").Value)
                Dim modified As String = path.ExportToWkt().ToString()
                path.Attributes("TextCol").Value = "Australia" & " " & DateTime.Now.Second.ToString()

                Using cn As New SqlConnection() With {.ConnectionString = Me.ConnectionString}
                    cn.Open()
                    ' For more information about SRID parameters, see https://docs.microsoft.com/en-us/sql/t-sql/spatial-geography/stsrid-geography-data-type?view=sql-server-ver15
                    Dim updatecmd As New SqlCommand("UPDATE DemoTable SET GeomCol1 = geometry::STGeomFromText('" & modified & "', 4326 ) WHERE id = " & id.ToString(), cn)
                    updatecmd.ExecuteNonQuery()

                    Dim updateattr As New SqlCommand("UPDATE DemoTable SET TextCol = '" & path.Attributes("TextCol").Value.ToString() & "' WHERE id =" & id.ToString(), cn)
                    updateattr.ExecuteNonQuery()
                End Using
            Next path
        End Sub

        Private Sub VectorLayer_DataLoaded(ByVal sender As Object, ByVal e As DataLoadedEventArgs)
            mapControl.ZoomToFitLayerItems()
        End Sub
    End Class
End Namespace