Document Actions
Add a layer by code
To add a layer by code usually it is necessary to create the driver and then to call LayerFactory. Let’s take a look:
LayerFactory.setDriversPath(
"C:\\eclipse3\\workspace\\Andami\\gvSIG\\extensiones\\com.iver.cit.gvsig\\drivers");
FLayer l = LayerFactory.createLayer("Vias",
(VectorialFileDriver) LayerFactory.getDM().getDriver("gvSIG shp driver"),
new File("C:/vias.shp"),
CRSFactory.getCRS("EPSG:23030"));
newMapControl.getMapContext().getLayers().addLayer(l);
A PostGIS layer is created as follows:
String dburl = "jdbc:postgresql://localhost/latin1";
String dbuser = "postgres";
String dbpass = "XXXXXXX";
// String dburl = "jdbc:postgresql://192.168.0.217/postgis";
// String dbuser = "gvsig";
// String dbpass = "";
// String dbtable = "carreteras_lin_5k_t10";
String dbtable = "provin"; // BECAREFUL WITH CAPITAL LETTERS!!!!!!!
IConnection conn = null;
System.out.println("Creating JDBC connection...");
Class.forName("org.postgresql.Driver");
conn = ConnectionFactory.createConnection(dburl, dbuser, dbpass);
((ConnectionJDBC)conn).getConnection().setAutoCommit(false);
DBLayerDefinition lyrDef = new DBLayerDefinition();
lyrDef.setName(dbtable);
lyrDef.setTableName(dbtable);
lyrDef.setWhereClause("");
String[] fields = {"nom_provin", "gid"};
lyrDef.setFieldNames(fields);
lyrDef.setFieldGeometry("the_geom");
lyrDef.setFieldID("gid");
Statement st = ((ConnectionJDBC)conn).getConnection().createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
rsGood = st.executeQuery("SELECT NOM_PROVIN, GID FROM " + dbtable + " ORDER BY GID");
driver.setData(conn, lyrDef);
}
catch (Exception e){
e.printStackTrace();
}
It is necessary to notice a vector layer is defined normally based on a driver and an object ILayerDefinition, where there are specified the layer’s name, fields, coordinate system, etc.
