[FEATURE] Add role logging for PostGIS versioning.

Add new column in PostGIS versioning plugin SQL.
Add SQL logic for functions and triggers.
Add new QLineEdit for column name.

Author: merkato

python/plugins/db_manager/db_plugins/postgis/plugins/versioning/DlgVersioning.ui

@@ -136,6 +136,23 @@
           </property>
          </widget>
         </item>
+        <item row="3" column="0">
+         <widget class="QLabel" name="label_9">
+          <property name="text">
+           <string>User role</string>
+          </property>
+          <property name="alignment">
+           <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+          </property>
+         </widget>
+        </item>
+        <item row="2" column="1">
+         <widget class="QLineEdit" name="editUser">
+          <property name="text">
+           <string>time_end</string>
+          </property>
+         </widget>
+        </item>         
        </layout>
       </widget>
      </item>
@@ -183,6 +200,7 @@
   <tabstop>editPkey</tabstop>
   <tabstop>editStart</tabstop>
   <tabstop>editEnd</tabstop>
+  <tabstop>editUser</tabstop> 
   <tabstop>txtSql</tabstop>
   <tabstop>buttonBox</tabstop>
  </tabstops>

python/plugins/db_manager/db_plugins/postgis/plugins/versioning/dlg_versioning.py

@@ -61,6 +61,7 @@ def __init__(self, item, parent=None):
         self.editPkey.textChanged.connect(self.updateSql)
         self.editStart.textChanged.connect(self.updateSql)
         self.editEnd.textChanged.connect(self.updateSql)
+        self.editUser.textChanged.connect(self.updateSql)
 
         self.updateSql()
 
@@ -114,6 +115,7 @@ def updateSql(self):
         self.colPkey = self.db.connector.quoteId(self.editPkey.text())
         self.colStart = self.db.connector.quoteId(self.editStart.text())
         self.colEnd = self.db.connector.quoteId(self.editEnd.text())
+        self.colUser = self.db.connector.quoteId(self.editUser.text())
 
         self.columns = [self.db.connector.quoteId(x.name) for x in self.table.fields()]
 
@@ -173,8 +175,8 @@ def showHelp(self):
         QMessageBox.information(self, "Help", helpText)
 
     def sql_alterTable(self):
-        return u"ALTER TABLE %s ADD %s serial, ADD %s timestamp, ADD %s timestamp;" % (
-            self.schematable, self.colPkey, self.colStart, self.colEnd)
+        return u"ALTER TABLE %s ADD %s serial, ADD %s timestamp, ADD %s timestamp, ADD %s varchar;" % (
+            self.schematable, self.colPkey, self.colStart, self.colEnd, self.colUser)
 
     def sql_setPkey(self):
         return u"ALTER TABLE %s DROP CONSTRAINT %s, ADD PRIMARY KEY (%s);" % (
@@ -209,6 +211,7 @@ def sql_functions(self):
   IF NEW.%(end)s IS NULL THEN
     INSERT INTO %(schematable)s (%(cols)s, %(start)s, %(end)s) VALUES (%(oldcols)s, OLD.%(start)s, current_timestamp);
     NEW.%(start)s = current_timestamp;
+    NEW.%(user)s = current_user;
   END IF;
   RETURN NEW;
 END;
@@ -222,12 +225,13 @@ def sql_functions(self):
   if NEW.%(start)s IS NULL then
     NEW.%(start)s = now();
     NEW.%(end)s = null;
+    NEW.%(user)s = current_user;
   end if;
   RETURN NEW;
 END;
 $$
 LANGUAGE 'plpgsql';""" % {'view': self.view, 'schematable': self.schematable, 'cols': cols, 'oldcols': old_cols,
-                          'start': self.colStart, 'end': self.colEnd, 'func_at_time': self.func_at_time,
+                          'start': self.colStart, 'end': self.colEnd, 'user': self.colUser, 'func_at_time': self.func_at_time,
                           'func_update': self.func_update, 'func_insert': self.func_insert}
         return sql