Merge pull request #5694 from elpaso/bugfix-17518-pg-import--without-…

…schema

[bugfix][postgres] Browser panel D&D a layer onto a postgresql connection tree …

src/providers/postgres/qgspostgresprovider.cpp

@@ -3696,6 +3696,7 @@ QgsVectorLayerExporter::ExportError QgsPostgresProvider::createEmptyLayer( const
 {
   // populate members from the uri structure
   QgsDataSourceUri dsUri( uri );
+
   QString schemaName = dsUri.schema();
   QString tableName = dsUri.table();
 
@@ -3791,6 +3792,20 @@ QgsVectorLayerExporter::ExportError QgsPostgresProvider::createEmptyLayer( const
   {
     conn->PQexecNR( QStringLiteral( "BEGIN" ) );
 
+    // We want a valid schema name ...
+    if ( schemaName.isEmpty() )
+    {
+      QString sql = QString( "SELECT current_schema" );
+      QgsPostgresResult result( conn->PQexec( sql ) );
+      if ( result.PQresultStatus() != PGRES_TUPLES_OK )
+        throw PGException( result );
+      schemaName = result.PQgetvalue( 0, 0 );
+      if ( schemaName.isEmpty() )
+      {
+        schemaName = QStringLiteral( "public" );
+      }
+    }
+
     QString sql = QString( "SELECT 1"
                            " FROM pg_class AS cls JOIN pg_namespace AS nsp"
                            " ON nsp.oid=cls.relnamespace "

tests/src/python/test_provider_postgres.py

@@ -1,10 +1,14 @@
 # -*- coding: utf-8 -*-
 """QGIS Unit tests for the postgres provider.
 
+Note: to prepare the DB, you need to run the sql files specified in
+tests/testdata/provider/testdata_pg.sh
+
 .. note:: This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.
+
 """
 from builtins import next
 __author__ = 'Matthias Kuhn'
@@ -765,6 +769,39 @@ def testKey(lyr, key, kfnames):
         testKey(lyr, '"f1","F2","f3"', ['f1', 'F2', 'f3'])
         testKey(lyr, None, ['id'])
 
+    # See https://issues.qgis.org/issues/17518
+    def testImportWithoutSchema(self):
+
+        def _test(table, schema=None):
+            self.execSQLCommand('DROP TABLE IF EXISTS %s CASCADE' % table)
+            uri = 'point?field=f1:int'
+            uri += '&field=F2:double(6,4)'
+            uri += '&field=f3:string(20)'
+            lyr = QgsVectorLayer(uri, "x", "memory")
+            self.assertTrue(lyr.isValid())
+
+            table = ("%s" % table) if schema is None else ("\"%s\".\"%s\"" % (schema, table))
+            dest_uri = "%s sslmode=disable table=%s  (geom) sql" % (self.dbconn, table)
+            err = QgsVectorLayerExporter.exportLayer(lyr, dest_uri, "postgres", lyr.crs())
+            olyr = QgsVectorLayer(dest_uri, "y", "postgres")
+            self.assertTrue(olyr.isValid(), "Failed URI: %s" % dest_uri)
+
+        # Test bug 17518
+        _test('b17518')
+
+        # Test fully qualified table (with schema)
+        _test("b17518", "qgis_test")
+
+        # Test empty schema
+        _test("b17518", "")
+
+        # Test public schema
+        _test("b17518", "public")
+
+        # Test fully qualified table (with wrong schema)
+        with self.assertRaises(AssertionError):
+            _test("b17518", "qgis_test_wrong")
+
     def testStyle(self):
         self.execSQLCommand('DROP TABLE IF EXISTS layer_styles CASCADE')