Question

我试图将几何体（POINT，LINE，POLYGON）插入到sqlite DB（spatialite）中的表中，所有代码都运行正常但是在查看行时，几何体的列始终是NULL。

INSERT后DB中的信息

应该如何：

字符串SQL的结果没问题，我正在使用

INSERT INTO Table1( Codigo, Nombre, Geometry) VALUES('1','Andalucia',GeomFromText('POLYGON((-75.8396284742612 8.39962954808519, ..., -75.8396284742612 8.39962954808519))', 4326));

INSERT INTO Table2( Codigo, Nombre, Geometry) VALUES('1','Andalucia',GeomFromText('POINT(-75.8361480385065 8.40883548152381)', 4326));

这是我在C＃上的代码：

public SQLiteConnection create_Open_SpatilaDB(string dbName)
{
    try
    {
        dbName += DateTime.Now.ToString("ddMMyyyyHHmmssff") + ".sqlite";

        string ruta = HttpContext.Current.Server.MapPath("/Uploads/" + dbName);

        string strConexion = "Data Source=" + ruta + ";Version=3;";

        SQLiteConnection conexion = null;

        if (!File.Exists(ruta))
        {
            // create the connection
            conexion = new SQLiteConnection(strConexion);

            //Abrir la conexión
            conexion.Open();

            //Load the lib
            conexion.EnableExtensions(true);
            conexion.LoadExtension("libspatialite-2.dll");                    

            //Create tables
            string SQL = "CREATE TABLE AppVersion ("
                        + " versionCode INTEGER NOT NULL PRIMARY KEY,"
                        + " state INTEGER NOT NULL);";

            SQLiteCommand cmd = new SQLiteCommand(SQL, conexion);
            cmd.ExecuteNonQuery();

            SQL = "CREATE TABLE Table1 ("                        
                + " Codigo TEXT NOT NULL PRIMARY KEY,"
                + " Nombre TEXT,"
                + " Geometry POLYGON);";

            cmd = new SQLiteCommand(SQL, conexion);
            cmd.ExecuteNonQuery();

            SQL = "CREATE TABLE Table2("
                    + " Codigo TEXT NOT NULL PRIMARY KEY,"
                    + " Nombre TEXT NOT NULL,"
                    + " Geometry POIN);";

            cmd = new SQLiteCommand(SQL, conexion);
            cmd.ExecuteNonQuery();
            .
            .
            .
        }
        else
        {
            conexion = new SQLiteConnection(strConexion);
            conexion.Open();
            conexion.EnableExtensions(true);
            conexion.LoadExtension("libspatialite-2.dll");
        }

        return conexion;

    }
    catch (Exception)
    {
        throw;
    }
}

在这里我插入信息：

public void insertInfo(SQLiteConnection conexion)
{
    try
    {
        string SQL = "BEGIN";
        SQLiteCommand cmd = new SQLiteCommand(SQL, conexion);
        cmd.ExecuteNonQuery();

        //Insert info table1        
        List<Table1> list = getInfoTable1();

        foreach (Table1 item in list)
        {
            SQL = "INSERT INTO Table1("
                    + " Codigo,"
                    + " Nombre,"
                    + " Geometry) VALUES("
                    + "'" + item.Codigo + "',"
                    + "'" + item.Nombre + "',"
                    + "GeomFromText(" + item.geom + "));";

            cmd = new SQLiteCommand(SQL, conexion);
            cmd.ExecuteNonQuery();
        }

        //Insert info table1        
        List<Table2> list = getInfoTable2();

        foreach (Table2 item in list)
        {
            SQL = "INSERT INTO Table2("
                    + " Codigo,"
                    + " Nombre,"
                    + " Geometry) VALUES("
                    + "'" + item.Codigo + "',"
                    + "'" + item.Nombre + "',"
                    + "GeomFromText(" + item.geom + "));";

            cmd = new SQLiteCommand(SQL, conexion);
            cmd.ExecuteNonQuery();
        }
        .
        .
        .
        SQL = "COMMIT";
        cmd = new SQLiteCommand(SQL, conexion);
        cmd.ExecuteNonQuery();
    }
    catch (Exception)
    {
        throw;
    }
}

Answer 1

我认为您必须将表格的列标记为几何列;否则它不会被识别为几何列。

为此，您应该使用RecoverGeometryColumn-Function将正常列转换为几何列。否则，您也可以使用AddGeometryColumn-Function 看看这个链接：
https://www.gaia-gis.it/gaia-sins/spatialite-cookbook/html/new-geom.html

此外，如果你真的想使用C＃，你应该考虑Spatialite＆gt; 4.2.0与SQLite的System.Data.SQLite ADO.NET提供程序。
也许你可以在这里看看这个讨论：
https://groups.google.com/forum/#!topic/spatialite-users/u2QZpQL_6ek

在spatialite上插入几何体总是插入null C＃

1 个答案: