[DB Manager] Allow lowercase field names for homogenize PostGIS Import

PostGIS provider has an option to lowercase field names. This options is available for user in QGIS algorithm ImportIntoPostGIS and not in DB Mananger.

This commit fix it.

python/plugins/db_manager/db_plugins/plugin.py

@@ -552,6 +552,9 @@ class Database(DbItemObject):
     def spatialIndexClause(self, src_table, src_column, dest_table, dest_table_column):
         return None
 
+    def hasLowercaseFieldNamesOption(self):
+        return False
+
 
 class Schema(DbItemObject):
 

python/plugins/db_manager/db_plugins/postgis/plugin.py

@@ -168,6 +168,9 @@ class PGDatabase(Database):
 
         item.runRefreshMaterializedView()
 
+    def hasLowercaseFieldNamesOption(self):
+        return True
+
 
 class PGSchema(Schema):
 

python/plugins/db_manager/dlg_import_vector.py

@@ -108,6 +108,10 @@ class DlgImportVector(QDialog, Ui_Dialog):
         if not self.chkSpatialIndex.isEnabled():
             self.chkSpatialIndex.setChecked(False)
 
+        self.chkLowercaseFieldNames.setEnabled(self.db.hasLowercaseFieldNamesOption())
+        if not self.chkLowercaseFieldNames.isEnabled():
+            self.chkLowercaseFieldNames.setChecked(False)
+
     def populateLayers(self):
         self.cboInputLayer.clear()
         for index, layer in enumerate(iface.legendInterface().layers()):
@@ -302,13 +306,18 @@ class DlgImportVector(QDialog, Ui_Dialog):
             else:
                 geom = None
 
+            options = {}
+            if self.chkLowercaseFieldNames.isEnabled() and self.chkLowercaseFieldNames.isChecked():
+                pk = pk.lower()
+                if geom:
+                    geom = geom.lower()
+                options['lowercaseFieldNames'] = True
+
             # get output params, update output URI
             self.outUri.setDataSource(schema, table, geom, "", pk)
             uri = self.outUri.uri(False)
 
             providerName = self.db.dbplugin().providerName()
-
-            options = {}
             if self.chkDropTable.isChecked():
                 options['overwrite'] = True
 

python/plugins/db_manager/ui/DlgImportVector.ui

@@ -253,7 +253,7 @@
         </property>
        </widget>
       </item>
-      <item row="7" column="0" colspan="2">
+      <item row="8" column="0" colspan="2">
        <widget class="QCheckBox" name="chkSpatialIndex">
         <property name="text">
          <string>Create spatial index</string>
@@ -267,6 +267,13 @@
         </property>
        </widget>
       </item>
+      <item row="7" column="0">
+       <widget class="QCheckBox" name="chkLowercaseFieldNames">
+        <property name="text">
+         <string>Convert field names to lowercase</string>
+        </property>
+       </widget>
+      </item>
      </layout>
     </widget>
    </item>