Merge pull request #9890 from qgis/backport-9873-to-release-3_6

[Backport release-3_6] [postgresql] Fix checkPrimaryKeyUnicity option

src/app/qgsprojectproperties.cpp

@@ -989,6 +989,8 @@ void QgsProjectProperties::apply()
   // Set the project title
   QgsProject::instance()->setTitle( title() );
   QgsProject::instance()->setPresetHomePath( QDir::fromNativeSeparators( mProjectHomeLineEdit->text() ) );
+
+  // DB-related options
   QgsProject::instance()->setAutoTransaction( mAutoTransaction->isChecked() );
   QgsProject::instance()->setEvaluateDefaultValues( mEvaluateDefaultValues->isChecked() );
   QgsProject::instance()->setTrustLayerMetadata( mTrustProjectCheckBox->isChecked() );

src/core/qgsvectorlayer.cpp

@@ -1559,25 +1559,26 @@ QString QgsVectorLayer::loadDefaultStyle( bool &resultFlag )
 
 bool QgsVectorLayer::setDataProvider( QString const &provider, const QgsDataProvider::ProviderOptions &options )
 {
-  mProviderKey = provider;     // XXX is this necessary?  Usually already set
+  mProviderKey = provider;
+  delete mDataProvider;
 
-  // primary key unicity is tested at construction time, so it has to be set
-  // before initializing postgres provider
-  QString checkUnicityKey = QStringLiteral( "checkPrimaryKeyUnicity" );
-  QString dataSource = mDataSource;
+  // For Postgres provider primary key unicity is tested at construction time,
+  // so it has to be set before initializing the provider,
+  // this manipulation is necessary to preserve default behavior when
+  // "trust layer metadata" project level option is set and checkPrimaryKeyUnicity
+  // was not explicitly passed in the uri
   if ( provider.compare( QLatin1String( "postgres" ) ) == 0 )
   {
-    QgsDataSourceUri uri( dataSource );
-
-    if ( uri.hasParam( checkUnicityKey ) )
-      uri.removeParam( checkUnicityKey );
-
-    uri.setParam( checkUnicityKey, mReadExtentFromXml ? "0" : "1" );
-    dataSource = uri.uri( false );
+    const QString checkUnicityKey { QStringLiteral( "checkPrimaryKeyUnicity" ) };
+    QgsDataSourceUri uri( mDataSource );
+    if ( ! uri.hasParam( checkUnicityKey ) )
+    {
+      uri.setParam( checkUnicityKey, mReadExtentFromXml ? "0" : "1" );
+      mDataSource = uri.uri( false );
+    }
   }
 
-  delete mDataProvider;
-  mDataProvider = qobject_cast<QgsVectorDataProvider *>( QgsProviderRegistry::instance()->createProvider( provider, dataSource, options ) );
+  mDataProvider = qobject_cast<QgsVectorDataProvider *>( QgsProviderRegistry::instance()->createProvider( provider, mDataSource, options ) );
   if ( !mDataProvider )
   {
     mValid = false;
@@ -1635,15 +1636,7 @@ bool QgsVectorLayer::setDataProvider( QString const &provider, const QgsDataProv
       if ( !lName.isEmpty() )
         setName( lName );
     }
-
     QgsDebugMsgLevel( QStringLiteral( "Beautified layer name %1" ).arg( name() ), 3 );
-
-    // deal with unnecessary schema qualification to make v.in.ogr happy
-    // and remove unnecessary key
-    QgsDataSourceUri dataProviderUri( mDataProvider->dataSourceUri() );
-    if ( dataProviderUri.hasParam( checkUnicityKey ) )
-      dataProviderUri.removeParam( checkUnicityKey );
-    mDataSource = dataProviderUri.uri( false );
   }
   else if ( mProviderKey == QLatin1String( "osm" ) )
   {

src/providers/postgres/qgspgtablemodel.cpp

@@ -20,6 +20,7 @@
 #include "qgslogger.h"
 #include "qgsapplication.h"
 #include "qgssettings.h"
+#include "qgsproject.h"
 
 #include <climits>
 
@@ -35,8 +36,11 @@ QgsPgTableModel::QgsPgTableModel()
   headerLabels << tr( "SRID" );
   headerLabels << tr( "Feature id" );
   headerLabels << tr( "Select at id" );
+  headerLabels << tr( "Check PK unicity" );
   headerLabels << tr( "Sql" );
   setHorizontalHeaderLabels( headerLabels );
+  setHeaderData( Columns::DbtmSelectAtId, Qt::Orientation::Horizontal, tr( "Disable 'Fast Access to Features at ID' capability to force keeping the attribute table in memory (e.g. in case of expensive views)." ), Qt::ToolTipRole );
+  setHeaderData( Columns::DbtmCheckPkUnicity, Qt::Orientation::Horizontal, tr( "Enable check for primary key unicity when loading views and materialized views. This option can make loading of large datasets significantly slower." ), Qt::ToolTipRole );
 }
 
 void QgsPgTableModel::addTableEntry( const QgsPostgresLayerProperty &layerProperty )
@@ -120,7 +124,25 @@ void QgsPgTableModel::addTableEntry( const QgsPostgresLayerProperty &layerProper
     QStandardItem *selItem = new QStandardItem( QString() );
     selItem->setFlags( selItem->flags() | Qt::ItemIsUserCheckable );
     selItem->setCheckState( Qt::Checked );
-    selItem->setToolTip( tr( "Disable 'Fast Access to Features at ID' capability to force keeping the attribute table in memory (e.g. in case of expensive views)." ) );
+    selItem->setToolTip( headerData( Columns::DbtmSelectAtId, Qt::Orientation::Horizontal, Qt::ToolTipRole ).toString() );
+
+    QStandardItem *checkPkUnicityItem  = new QStandardItem( QString() );
+    checkPkUnicityItem->setFlags( checkPkUnicityItem->flags() | Qt::ItemIsUserCheckable );
+
+    // Legacy: default value is determined by project option to trust layer's metadata
+    // TODO: remove this default from QGIS 4 and leave default value to false?
+    // checkPkUnicity has only effect on views and materialized views, so we can safely disable it
+    if ( layerProperty.isView || layerProperty.isMaterializedView )
+    {
+      checkPkUnicityItem->setCheckState( QgsProject::instance( )->trustLayerMetadata() ? Qt::CheckState::Unchecked : Qt::CheckState::Checked );
+      checkPkUnicityItem->setToolTip( headerData( Columns::DbtmCheckPkUnicity, Qt::Orientation::Horizontal, Qt::ToolTipRole ).toString() );
+    }
+    else
+    {
+      checkPkUnicityItem->setCheckState( Qt::CheckState::Unchecked );
+      checkPkUnicityItem->setFlags( checkPkUnicityItem->flags() & ~ Qt::ItemIsEnabled );
+      checkPkUnicityItem->setToolTip( tr( "This option is only available for views and materialized views." ) );
+    }
 
     QStandardItem *sqlItem = new QStandardItem( layerProperty.sql );
 
@@ -135,6 +157,7 @@ void QgsPgTableModel::addTableEntry( const QgsPostgresLayerProperty &layerProper
     childItemList << sridItem;
     childItemList << pkItem;
     childItemList << selItem;
+    childItemList << checkPkUnicityItem;
     childItemList << sqlItem;
 
     Q_FOREACH ( QStandardItem *item, childItemList )
@@ -144,7 +167,7 @@ void QgsPgTableModel::addTableEntry( const QgsPostgresLayerProperty &layerProper
       else
         item->setFlags( item->flags() & ~Qt::ItemIsSelectable );
 
-      if ( tip.isEmpty() )
+      if ( tip.isEmpty() && item != checkPkUnicityItem && item != selItem )
       {
         item->setToolTip( QString() );
       }
@@ -374,6 +397,7 @@ QString QgsPgTableModel::layerURI( const QModelIndex &index, const QString &conn
 
   bool selectAtId = itemFromIndex( index.sibling( index.row(), DbtmSelectAtId ) )->checkState() == Qt::Checked;
   QString sql = index.sibling( index.row(), DbtmSql ).data( Qt::DisplayRole ).toString();
+  bool checkPrimaryKeyUnicity = itemFromIndex( index.sibling( index.row(), DbtmCheckPkUnicity ) )->checkState() == Qt::Checked;
 
   QgsDataSourceUri uri( connInfo );
 
@@ -390,6 +414,7 @@ QString QgsPgTableModel::layerURI( const QModelIndex &index, const QString &conn
   uri.setWkbType( wkbType );
   uri.setSrid( srid );
   uri.disableSelectAtId( !selectAtId );
+  uri.setParam( QStringLiteral( "checkPrimaryKeyUnicity" ), checkPrimaryKeyUnicity ? QLatin1Literal( "1" ) : QLatin1Literal( "0" ) );
 
   QgsDebugMsg( QStringLiteral( "returning uri %1" ).arg( uri.uri( false ) ) );
   return uri.uri( false );

src/providers/postgres/qgspgtablemodel.h

@@ -53,6 +53,7 @@ class QgsPgTableModel : public QStandardItemModel
       DbtmSrid,
       DbtmPkCol,
       DbtmSelectAtId,
+      DbtmCheckPkUnicity,
       DbtmSql,
       DbtmColumns
     };

src/providers/postgres/qgspostgresconn.h

@@ -83,7 +83,6 @@ struct QgsPostgresLayerProperty
   bool                          isMaterializedView = false;
   QString                       tableComment;
 
-
   // TODO: rename this !
   int size() const { Q_ASSERT( types.size() == srids.size() ); return types.size(); }
 

src/providers/postgres/qgspostgresprovider.cpp

@@ -108,6 +108,7 @@ QgsPostgresProvider::QgsPostgresProvider( QString const &uri, const ProviderOpti
 
   if ( mUri.hasParam( QStringLiteral( "checkPrimaryKeyUnicity" ) ) )
   {
+
     if ( mUri.param( QStringLiteral( "checkPrimaryKeyUnicity" ) ).compare( QLatin1String( "0" ) )  == 0 )
     {
       mCheckPrimaryKeyUnicity = false;
@@ -1312,7 +1313,7 @@ bool QgsPostgresProvider::determinePrimaryKey()
 
     QStringList log;
 
-    // no primary or unique indizes found
+    // no primary or unique indices found
     if ( res.PQntuples() == 0 )
     {
       QgsDebugMsg( QStringLiteral( "Relation has no primary key -- investigating alternatives" ) );
@@ -1568,7 +1569,6 @@ bool QgsPostgresProvider::uniqueData( const QString &quotedColNames )
     pushError( unique.PQresultErrorMessage() );
     return false;
   }
-
   return unique.PQntuples() == 1 && unique.PQgetvalue( 0, 0 ).startsWith( 't' );
 }
 

src/ui/qgsprojectpropertiesbase.ui

@@ -236,7 +236,7 @@
           </sizepolicy>
          </property>
          <property name="currentIndex">
-          <number>8</number>
+          <number>4</number>
          </property>
          <widget class="QWidget" name="mProjOptsGeneral">
           <layout class="QVBoxLayout" name="verticalLayout_6">
@@ -265,8 +265,8 @@
                <rect>
                 <x>0</x>
                 <y>0</y>
-                <width>590</width>
-                <height>777</height>
+                <width>537</width>
+                <height>795</height>
                </rect>
               </property>
               <layout class="QVBoxLayout" name="verticalLayout_8">
@@ -863,8 +863,8 @@
                <rect>
                 <x>0</x>
                 <y>0</y>
-                <width>603</width>
-                <height>161</height>
+                <width>546</width>
+                <height>164</height>
                </rect>
               </property>
               <layout class="QVBoxLayout" name="verticalLayout_7">
@@ -938,8 +938,8 @@
                <rect>
                 <x>0</x>
                 <y>0</y>
-                <width>290</width>
-                <height>543</height>
+                <width>269</width>
+                <height>553</height>
                </rect>
               </property>
               <layout class="QVBoxLayout" name="verticalLayout_12">
@@ -1378,7 +1378,7 @@
            <item row="3" column="0">
             <widget class="QCheckBox" name="mTrustProjectCheckBox">
              <property name="toolTip">
-              <string>Speed up project loading by skipping data checks. Useful in qgis server context or project with huge database views or materialized views.</string>
+              <string>Speed up project loading by skipping data checks in PostgreSQL layers. Useful in QGIS server context or project with huge database views or materialized views.</string>
              </property>
              <property name="text">
               <string>Trust project when data source has no metadata</string>
@@ -1514,8 +1514,8 @@
                <rect>
                 <x>0</x>
                 <y>0</y>
-                <width>178</width>
-                <height>54</height>
+                <width>167</width>
+                <height>55</height>
                </rect>
               </property>
               <layout class="QVBoxLayout" name="verticalLayout_17">
@@ -1575,9 +1575,9 @@
               <property name="geometry">
                <rect>
                 <x>0</x>
-                <y>-975</y>
-                <width>671</width>
-                <height>2682</height>
+                <y>0</y>
+                <width>598</width>
+                <height>2732</height>
                </rect>
               </property>
               <layout class="QVBoxLayout" name="verticalLayout_13">

tests/src/python/test_provider_postgres.py

@@ -1097,6 +1097,37 @@ def testReadExtentOnTable(self):
 
         self.assertEqual(vl2.extent(), originalExtent)
 
+    def testCheckPkUnicityOnView(self):
+        # vector layer based on view
+
+        # This is valid
+        vl0 = QgsVectorLayer(self.dbconn + ' checkPrimaryKeyUnicity=\'0\'  sslmode=disable key=\'pk\' srid=0 type=POINT table="qgis_test"."b21839_pk_unicity_view" (geom) sql=', 'test', 'postgres')
+        self.assertTrue(vl0.isValid())
+
+        geom = vl0.getFeature(1).geometry().asWkt()
+
+        # This is NOT valid
+        vl0 = QgsVectorLayer(self.dbconn + ' checkPrimaryKeyUnicity=\'1\' sslmode=disable key=\'an_int\' srid=0 type=POINT table="qgis_test"."b21839_pk_unicity_view" (geom) sql=', 'test', 'postgres')
+        self.assertFalse(vl0.isValid())
+
+        # This is NOT valid because the default is to check unicity
+        vl0 = QgsVectorLayer(self.dbconn + ' sslmode=disable key=\'an_int\' srid=0 type=POINT table="qgis_test"."b21839_pk_unicity_view" (geom) sql=', 'test', 'postgres')
+        self.assertFalse(vl0.isValid())
+
+        # This is valid because the readExtentFromXml option is set
+        options = QgsVectorLayer.LayerOptions(True, True)  # loadDefaultStyle, readExtentFromXml
+        vl0 = QgsVectorLayer(self.dbconn + ' sslmode=disable key=\'an_int\' srid=0 type=POINT table="qgis_test"."b21839_pk_unicity_view" (geom) sql=', 'test', 'postgres', options)
+        self.assertTrue(vl0.isValid())
+
+        # Valid because a_unique_int is unique and default is to check unicity
+        vl0 = QgsVectorLayer(self.dbconn + ' sslmode=disable key=\'a_unique_int\' srid=0 type=POINT table="qgis_test"."b21839_pk_unicity_view" (geom) sql=', 'test', 'postgres')
+        self.assertEqual(vl0.getFeature(1).geometry().asWkt(), geom)
+
+        # Valid because a_unique_int is unique
+        vl0 = QgsVectorLayer(self.dbconn + ' checkPrimaryKeyUnicity=\'1\' sslmode=disable key=\'a_unique_int\' srid=0 type=POINT table="qgis_test"."b21839_pk_unicity_view" (geom) sql=', 'test', 'postgres')
+        self.assertTrue(vl0.isValid())
+        self.assertEqual(vl0.getFeature(1).geometry().asWkt(), geom)
+
     def testNotify(self):
         vl0 = QgsVectorLayer(self.dbconn + ' sslmode=disable key=\'pk\' srid=4326 type=POLYGON table="qgis_test"."some_poly_data" (geom) sql=', 'test', 'postgres')
         vl0.dataProvider().setListening(True)

tests/testdata/provider/testdata_pg.sql

@@ -534,4 +534,43 @@ INSERT INTO qgis_test.check_constraints VALUES (
   1, -- id
   4, -- a
   3  -- b
+);
+
+
+---------------------------------------------
+--
+-- Table and view for tests on  checkPrimaryKeyUnicity
+--
+
+DROP TABLE IF EXISTS qgis_test.b21839_pk_unicity CASCADE;
+CREATE TABLE qgis_test.b21839_pk_unicity
+(
+  pk serial NOT NULL,
+  an_int integer NOT NULL,
+  a_unique_int integer NOT NULL,
+  geom geometry(Point),
+  CONSTRAINT b21839_pk_unicity_pkey PRIMARY KEY (pk)
 )
+WITH (
+  OIDS=FALSE
+);
+
+
+INSERT INTO qgis_test.b21839_pk_unicity(
+            pk, an_int, a_unique_int , geom)
+    VALUES (1, 1, 1, ST_GeomFromText('point( 1 1)'));
+
+
+INSERT INTO qgis_test.b21839_pk_unicity(
+            pk, an_int, a_unique_int, geom)
+    VALUES (2, 1, 2, ST_GeomFromText('point( 1 3)'));
+
+
+
+CREATE OR REPLACE VIEW qgis_test.b21839_pk_unicity_view AS
+ SELECT b21839_pk_unicity.pk,
+    b21839_pk_unicity.an_int,
+    b21839_pk_unicity.a_unique_int,
+    b21839_pk_unicity.geom
+   FROM qgis_test.b21839_pk_unicity;
+