/// <summary>
/// Method to open a geopackage file
/// </summary>
/// <param name="filename">The filename of the GeoPackage</param>
/// <param name="password">The password to access the GeoPackage</param>
/// <returns></returns>
public static GeoPackage Open(string filename, string password = null)
{
try
{
GpkgUtility.CheckRequirements(filename, password);
return(new GeoPackage(GpkgUtility.CreateConnectionString(filename, password)));
}
catch (Exception)
{
throw new GeoPackageException(string.Format("Failed to open GeoPackage '{0}'", filename));
}
}
internal FeatureDataTable GetBaseTable()
{
const string sqlPragmaTableInfo = "PRAGMA table_info('{0}');";
const string sqlSelectHasColumnData =
"SELECT COUNT(*) FROM \"sqlite_master\" WHERE \"type\"='table' AND \"name\"='gpkg_column_data';";
const string sqlSelectColumnData =
"SELECT * FROM \"gpkg_column_data\" WHERE \"table_name\"=? AND \"column_name\"=?;";
const string sqlSelectColumnConstraint =
"SELECT * FROM \"gpkg_column_constraint\" WHERE \"constraint_name\"=?;";
var fdt = new FeatureDataTable();
// Get the geometry column definition if not previously done
if (string.IsNullOrEmpty(GeometryColumn))
{
GetGeometryColumnDefinition();
}
using (var cnCI = new SQLiteConnection(_connectionString).OpenAndReturn())
using (var cnCD = new SQLiteConnection(_connectionString).OpenAndReturn())
using (var cnCC = new SQLiteConnection(_connectionString).OpenAndReturn())
{
var rdrCI = new SQLiteCommand(string.Format(sqlPragmaTableInfo, TableName), cnCI).ExecuteReader();
if (!rdrCI.HasRows)
{
throw new GeoPackageException("The table '{0}' does not exist in database!");
}
// has additional column data?
var cmdCD = new SQLiteCommand(sqlSelectHasColumnData, cnCD);
var hasCD = Convert.ToInt32(cmdCD.ExecuteScalar()) == 1;
// additional column data
cmdCD = new SQLiteCommand(sqlSelectColumnData, cnCD);
var parCD0 = cmdCD.Parameters.Add("table_name", DbType.String);
parCD0.Value = TableName;
var parCD1 = cmdCD.Parameters.Add("column_name", DbType.String);
// additional column constaint(s)
var cmdCC = new SQLiteCommand(sqlSelectColumnConstraint, cnCC);
var parCC0 = cmdCC.Parameters.Add("pcc", DbType.String);
while (rdrCI.Read())
{
// Get the column name
var columnName = rdrCI.GetString(1);
// We don't want the geometry to appear as an attribute in the feature data table;
if (columnName == GeometryColumn)
{
continue;
}
// Set up the column
// column name and type
var dc = new DataColumn(rdrCI.GetString(1), GpkgUtility.GetTypeForDataTypeString(rdrCI.GetString(2)));
// Allow DBNull?
if (rdrCI.GetInt32(3) == 0)
{
dc.AllowDBNull = true;
}
// Assign default value
if (!rdrCI.IsDBNull(4))
{
dc.DefaultValue = rdrCI.GetValue(4);
}
// Add the column
fdt.Columns.Add(dc);
// Get additional information
if (hasCD)
{
parCD1.Value = columnName;
var rdrCD = cmdCD.ExecuteReader(CommandBehavior.SingleRow);
if (rdrCD.HasRows)
{
rdrCD.Read();
if (!rdrCD.IsDBNull(2))
{
dc.Caption = rdrCD.GetString(2);
}
if (!rdrCD.IsDBNull(3))
{
dc.ExtendedProperties.Add("Title", rdrCD.GetString(3));
}
if (!rdrCD.IsDBNull(4))
{
dc.ExtendedProperties.Add("Description", rdrCD.GetString(4));
}
if (!rdrCD.IsDBNull(5))
{
dc.ExtendedProperties.Add("MimeType", rdrCD.GetString(5));
}
if (!rdrCD.IsDBNull(rdrCD.GetOrdinal("constraint_name")))
{
parCC0.Value = rdrCD.GetString(rdrCD.GetOrdinal("constraint_name"));
var rdrCC = cmdCC.ExecuteReader();
while (rdrCC.Read())
{
}
}
}
}
if (rdrCI.GetInt32(5) == 1)
{
fdt.PrimaryKey = new[] { dc };
OidColumn = dc.ColumnName;
}
}
}
return(fdt);
}
