postgres provider: use INT_MIN for unknown srid (fixes #7889)

Author: jef-n

src/providers/postgres/qgscolumntypethread.cpp

@@ -77,7 +77,7 @@ void QgsGeomColumnTypeThread::run()
 
       if ( !layerProperty.geometryColName.isNull() &&
            ( layerProperty.types.value( 0, QGis::WKBUnknown ) == QGis::WKBUnknown ||
-             layerProperty.srids.value( 0, 0 ) <= 0 ) )
+             layerProperty.srids.value( 0, INT_MIN ) == INT_MIN ) )
       {
         if ( dontResolveType )
         {

src/providers/postgres/qgspgtablemodel.cpp

@@ -56,7 +56,7 @@ void QgsPgTableModel::addTableEntry( QgsPostgresLayerProperty layerProperty )
       wkbType = QGis::WKBNoGeometry;
     }
 
-    bool selectable = wkbType == QGis::WKBNoGeometry || ( wkbType != QGis::WKBUnknown && srid >= 0 );
+    bool selectable = wkbType == QGis::WKBNoGeometry || ( wkbType != QGis::WKBUnknown && srid != INT_MIN );
 
     QStandardItem *schemaNameItem = new QStandardItem( layerProperty.schemaName );
     QStandardItem *typeItem = new QStandardItem( iconForWkbType( wkbType ), wkbType == QGis::WKBUnknown ? tr( "Select..." ) : QgsPostgresConn::displayStringForWkbType( wkbType ) );
@@ -70,7 +70,7 @@ void QgsPgTableModel::addTableEntry( QgsPostgresLayerProperty layerProperty )
     QStandardItem *tableItem = new QStandardItem( layerProperty.tableName );
     QStandardItem *geomItem  = new QStandardItem( layerProperty.geometryColName );
     QStandardItem *sridItem  = new QStandardItem( wkbType != QGis::WKBNoGeometry ? QString::number( srid ) : "" );
-    sridItem->setEditable( wkbType != QGis::WKBNoGeometry && srid < 0 );
+    sridItem->setEditable( wkbType != QGis::WKBNoGeometry && srid == INT_MIN );
     if ( sridItem->isEditable() )
     {
       sridItem->setText( tr( "Enter..." ) );
@@ -250,7 +250,7 @@ bool QgsPgTableModel::setData( const QModelIndex &idx, const QVariant &value, in
     if ( ok && geomType != QGis::WKBNoGeometry )
     {
       int srid = idx.sibling( idx.row(), dbtmSrid ).data().toInt( &ok );
-      ok &= srid >= 0;
+      ok &= srid != INT_MIN;
     }
 
     QStringList pkCols = idx.sibling( idx.row(), dbtmPkCol ).data( Qt::UserRole + 1 ).toStringList();

src/providers/postgres/qgspostgresconn.cpp

@@ -378,10 +378,15 @@ bool QgsPostgresConn::getTableInfo( bool searchGeometryColumnsOnly, bool searchP
       QString schemaName = result.PQgetvalue( idx, 1 );
       QString column = result.PQgetvalue( idx, 2 );
       QString type = result.PQgetvalue( idx, 3 );
-      QString srid = result.PQgetvalue( idx, 4 );
+      QString ssrid = result.PQgetvalue( idx, 4 );
       QString relkind = result.PQgetvalue( idx, 5 );
-      if ( srid.isEmpty() || srid == "0" )
-        srid = "-1";
+
+      int srid = ssrid.isEmpty() ? INT_MIN : ssrid.toInt();
+      if ( majorVersion() >= 2 && srid == 0 )
+      {
+        // 0 doesn't constraint => detect
+        srid = INT_MIN;
+      }
 
       QgsDebugMsg( QString( "%1 : %2.%3.%4: %5 %6 %7" )
                    .arg( gtableName )
@@ -396,7 +401,7 @@ bool QgsPostgresConn::getTableInfo( bool searchGeometryColumnsOnly, bool searchP
       layerProperty.geometryColName = column;
       layerProperty.geometryColType = columnType;
       layerProperty.types = QList<QGis::WkbType>() << ( QgsPostgresConn::wkbTypeFromPostgis( type ) );
-      layerProperty.srids = QList<int>() << srid.toInt();
+      layerProperty.srids = QList<int>() << srid;
       layerProperty.sql = "";
 
       if ( relkind == "v" )
@@ -572,7 +577,7 @@ bool QgsPostgresConn::getTableInfo( bool searchGeometryColumnsOnly, bool searchP
       QgsDebugMsg( QString( "%1.%2: %3" ).arg( schema ).arg( table ).arg( relkind ) );
 
       layerProperty.types = QList<QGis::WkbType>() << QGis::WKBNoGeometry;
-      layerProperty.srids = QList<int>() << -1;
+      layerProperty.srids = QList<int>() << INT_MIN;
       layerProperty.schemaName = schema;
       layerProperty.tableName = table;
       layerProperty.geometryColName = QString::null;

src/providers/postgres/qgspostgresdataitems.cpp

@@ -122,9 +122,8 @@ void QgsPGConnectionItem::setLayerType( QgsPostgresLayerProperty layerProperties
   for ( int i = 0; i < layerProperties.size(); i++ )
   {
     QgsPostgresLayerProperty layerProperty = layerProperties.at( i );
-
     if ( layerProperty.types[0] == QGis::WKBUnknown ||
-        (!layerProperty.geometryColName.isEmpty() && layerProperty.srids[0] < 0 ) )
+         ( !layerProperty.geometryColName.isEmpty() && layerProperty.srids[0] == INT_MIN ) )
       continue;
 
     if ( !schemaItem )