wider support for vector layer queries:

- add query support for OGR and spatialite layers (additional to postgres)
- QgsDataProvider::setSubsetString() now returns if the query is successful.
- add optional parameter to limit number of values returned from QgsVectorDataProvider::uniqueValues() 
- rename QgsDbSourceSelect to QgsPgSourceSelect, use QgsVectorLayer for layer queries and make it wider
- QgsDataSourceURI: improve quoting
- fix relative path support for SpatiaLite on windows
- rename QgsPgQueryBuilder to QgsQueryBuilder and use QgsVectorLayer for
  queries instead of postgres

cleanups:
- rename QgsServerSourceSelect to QgsWMSSourceSelect



git-svn-id: http://svn.osgeo.org/qgis/trunk@11762 c8812cc2-4d05-0410-92ff-de0c093fc19c

python/core/qgsdataprovider.sip

@@ -64,7 +64,7 @@ class QgsDataProvider : QObject
        * that can be used by the data provider to create a subset.
        * Must be implemented in the dataprovider.
       */
-      virtual void setSubsetString(QString subset);
+      virtual bool setSubsetString(QString subset);
 
 
       /**

python/core/qgsvectordataprovider.sip

@@ -141,10 +141,11 @@ class QgsVectorDataProvider : QgsDataProvider
        * Return unique values of an attribute
        * @param index the index of the attribute
        * @param values reference to the list to fill
+       * @param limit maximum number of values to return (added in 1.4)
        *
        * Default implementation simply iterates the features 
        */
-      virtual void uniqueValues(int index, QList<QVariant> &uniqueValues /Out/);
+      virtual void uniqueValues(int index, QList<QVariant> &uniqueValues /Out/, int limit = -1);
 
       /**Returns the possible enum values of an attribute. Returns an empty stringlist if a provider does not support enum types
       or if the given attribute is not an enum type.

python/core/qgsvectorlayer.sip

@@ -154,8 +154,9 @@ public:
    * @param subset The subset string. This may be the where clause of a sql statement
    *               or other defintion string specific to the underlying dataprovider
    *               and data store.
+   * @return true, when setting the string was successful, false otherwise (added in 1.4)
    */
-  virtual void setSubsetString(QString subset);
+  virtual bool setSubsetString(QString subset);
 
   /**
    * Get the string (typically sql) used to define a subset of the layer

src/app/CMakeLists.txt

@@ -63,13 +63,14 @@ SET(QGIS_APP_SRCS
   qgsprojectproperties.cpp
   qgsrasterlayerproperties.cpp
   qgssearchquerybuilder.cpp
-  qgsserversourceselect.cpp
+  qgswmssourceselect.cpp
   qgsshortcutsmanager.cpp
   qgssinglesymboldialog.cpp
   qgssnappingdialog.cpp
   qgsundowidget.cpp
   qgsuniquevaluedialog.cpp
   qgsvectorlayerproperties.cpp
+  qgsquerybuilder.cpp
 
   composer/qgscomposer.cpp
   composer/qgscomposeritemwidget.cpp
@@ -159,14 +160,15 @@ SET (QGIS_APP_MOC_HDRS
   qgsprojectproperties.h
   qgsrasterlayerproperties.h
   qgssearchquerybuilder.h
-  qgsserversourceselect.h
+  qgswmssourceselect.h
   qgssinglesymboldialog.h
   qgssnappingdialog.h
   qgsuniquevaluedialog.h
   qgsvectorlayerproperties.h
   qgsdbtablemodel.h
   qgsspatialitetablemodel.h
   qgsundowidget.h
+  qgsquerybuilder.h
 
   composer/qgscomposer.h
   composer/qgscomposeritemwidget.h
@@ -182,7 +184,6 @@ SET (QGIS_APP_MOC_HDRS
   legend/qgslegendlayer.h
   legend/qgslegendlayerfile.h
 
-
   ogr/qgsopenvectorlayerdialog.h
   ogr/qgsnewogrconnection.h
 
@@ -198,14 +199,12 @@ IF (POSTGRES_FOUND)
   ENDIF(HAVE_PGCONFIG)
 
   SET (QGIS_APP_SRCS ${QGIS_APP_SRCS}
-    qgsdbsourceselect.cpp
+    qgspgsourceselect.cpp
     qgsnewconnection.cpp
-    qgspgquerybuilder.cpp
     )
   SET (QGIS_APP_MOC_HDRS ${QGIS_APP_MOC_HDRS}
-    qgsdbsourceselect.h
+    qgspgsourceselect.h
     qgsnewconnection.h
-    qgspgquerybuilder.h
     )
 ENDIF (POSTGRES_FOUND)
 

src/app/main.cpp

@@ -488,12 +488,8 @@ int main( int argc, char *argv[] )
     exit( 1 );
   }
 
-
-  // myApp.setFont(QFont("helvetica", 11));
-
   QString i18nPath = QgsApplication::i18nPath();
 
-
   /* Translation file for QGIS.
    */
   QSettings mySettings;
@@ -614,12 +610,9 @@ int main( int argc, char *argv[] )
   }
 #endif
 
-
-
   QgisApp *qgis = new QgisApp( mypSplash ); // "QgisApp" used to find canonical instance
   qgis->setObjectName( "QgisApp" );
 
-
   /////////////////////////////////////////////////////////////////////
   // If no --project was specified, parse the args to look for a     //
   // .qgs file and set myProjectFileName to it. This allows loading  //
@@ -648,15 +641,12 @@ int main( int argc, char *argv[] )
     qgis->openProject( myProjectFileName );
   }
 
-
   /////////////////////////////////////////////////////////////////////
   // autoload any file names that were passed in on the command line
   /////////////////////////////////////////////////////////////////////
   QgsDebugMsg( QString( "Number of files in myFileList: %1" ).arg( myFileList.count() ) );
   for ( QStringList::Iterator myIterator = myFileList.begin(); myIterator != myFileList.end(); ++myIterator )
   {
-
-
     QgsDebugMsg( QString( "Trying to load file : %1" ).arg(( *myIterator ) ) );
     QString myLayerName = *myIterator;
     // don't load anything with a .qgs extension - these are project files

src/app/qgisapp.cpp

@@ -131,7 +131,7 @@
 #include "qgsrasterlayerproperties.h"
 #include "qgsrectangle.h"
 #include "qgsrenderer.h"
-#include "qgsserversourceselect.h"
+#include "qgswmssourceselect.h"
 #include "qgsshortcutsmanager.h"
 #include "qgsundowidget.h"
 #include "qgsvectordataprovider.h"
@@ -183,7 +183,7 @@
 // Conditional Includes
 //
 #ifdef HAVE_POSTGRESQL
-#include "qgsdbsourceselect.h"
+#include "qgspgsourceselect.h"
 #endif
 #ifdef HAVE_SPATIALITE
 #include "qgsspatialitesourceselect.h"
@@ -2586,7 +2586,7 @@ void QgisApp::addDatabaseLayer()
   // only supports postgis layers at present
   // show the postgis dialog
 
-  QgsDbSourceSelect *dbs = new QgsDbSourceSelect( this );
+  QgsPgSourceSelect *dbs = new QgsPgSourceSelect( this );
 
   mMapCanvas->freeze();
 
@@ -2742,7 +2742,7 @@ void QgisApp::addWmsLayer()
   // Fudge for now
   QgsDebugMsg( "about to addRasterLayer" );
 
-  QgsServerSourceSelect *wmss = new QgsServerSourceSelect( this );
+  QgsWMSSourceSelect *wmss = new QgsWMSSourceSelect( this );
   wmss->exec();
 }
 
@@ -3148,10 +3148,6 @@ void QgisApp::fileNew( bool thePromptToSaveFlag )
 
 void QgisApp::newVectorLayer()
 {
-  QgsDebugMsg( "++++++++++++++++++++++++++++++++++++++++++" );
-  QgsDebugMsg( "newVectorLayer called" );
-  QgsDebugMsg( "++++++++++++++++++++++++++++++++++++++++++" );
-
   if ( mMapCanvas && mMapCanvas->isDrawing() )
   {
     return;
@@ -3273,9 +3269,6 @@ void QgisApp::newVectorLayer()
   fileNames.append( fileName );
   //todo: the last parameter will change accordingly to layer type
   addVectorLayers( fileNames, enc, "file" );
-  QgsDebugMsg( "++++++++++++++++++++++++++++++++++++++++++" );
-  QgsDebugMsg( "newVectorLayer done!" );
-  QgsDebugMsg( "++++++++++++++++++++++++++++++++++++++++++" );
 }
 
 void QgisApp::fileOpen()

src/app/qgsdbtablemodel.cpp

@@ -39,13 +39,13 @@ QgsDbTableModel::~QgsDbTableModel()
 void QgsDbTableModel::addTableEntry( QString type, QString schemaName, QString tableName, QString geometryColName, const QStringList &pkCols, QString sql )
 {
   //is there already a root item with the given scheme Name?
-  QStandardItem* schemaItem;
-  QList<QStandardItem*> schemaItems = findItems( schemaName, Qt::MatchExactly, 0 );
+  QStandardItem *schemaItem;
+  QList<QStandardItem*> schemaItems = findItems( schemaName, Qt::MatchExactly, dbtmSchema );
 
   //there is already an item for this schema
   if ( schemaItems.size() > 0 )
   {
-    schemaItem = schemaItems.at( 0 );
+    schemaItem = schemaItems.at( dbtmSchema );
   }
   else //create a new toplevel item for this schema
   {
@@ -75,7 +75,6 @@ void QgsDbTableModel::addTableEntry( QString type, QString schemaName, QString t
   QStandardItem* sqlItem = new QStandardItem( sql );
   sqlItem->setFlags( Qt::ItemIsEnabled | Qt::ItemIsSelectable );
 
-
   childItemList.push_back( schemaNameItem );
   childItemList.push_back( tableItem );
   childItemList.push_back( typeItem );
@@ -87,17 +86,17 @@ void QgsDbTableModel::addTableEntry( QString type, QString schemaName, QString t
   ++mTableCount;
 }
 
-void QgsDbTableModel::setSql( const QModelIndex& index, const QString &sql )
+void QgsDbTableModel::setSql( const QModelIndex &index, const QString &sql )
 {
   if ( !index.isValid() || !index.parent().isValid() )
   {
     return;
   }
 
   //find out schema name and table name
-  QModelIndex schemaSibling = index.sibling( index.row(), 0 );
-  QModelIndex tableSibling = index.sibling( index.row(), 1 );
-  QModelIndex geomSibling = index.sibling( index.row(), 3 );
+  QModelIndex schemaSibling = index.sibling( index.row(), dbtmSchema );
+  QModelIndex tableSibling = index.sibling( index.row(), dbtmTable );
+  QModelIndex geomSibling = index.sibling( index.row(), dbtmGeomCol );
 
   if ( !schemaSibling.isValid() || !tableSibling.isValid() || !geomSibling.isValid() )
   {
@@ -108,13 +107,13 @@ void QgsDbTableModel::setSql( const QModelIndex& index, const QString &sql )
   QString tableName = itemFromIndex( tableSibling )->text();
   QString geomName = itemFromIndex( geomSibling )->text();
 
-  QList<QStandardItem*> schemaItems = findItems( schemaName, Qt::MatchExactly, 0 );
+  QList<QStandardItem*> schemaItems = findItems( schemaName, Qt::MatchExactly, dbtmSchema );
   if ( schemaItems.size() < 1 )
   {
     return;
   }
 
-  QStandardItem* schemaItem = schemaItems.at( 0 );
+  QStandardItem* schemaItem = schemaItems.at( dbtmSchema );
   int numChildren = schemaItem->rowCount();
 
   QModelIndex currentChildIndex;
@@ -123,18 +122,18 @@ void QgsDbTableModel::setSql( const QModelIndex& index, const QString &sql )
 
   for ( int i = 0; i < numChildren; ++i )
   {
-    currentChildIndex = indexFromItem( schemaItem->child( i, 0 ) );
+    currentChildIndex = indexFromItem( schemaItem->child( i, dbtmSchema ) );
     if ( !currentChildIndex.isValid() )
     {
       continue;
     }
-    currentTableIndex = currentChildIndex.sibling( i, 1 );
+    currentTableIndex = currentChildIndex.sibling( i, dbtmTable );
     if ( !currentTableIndex.isValid() )
     {
       continue;
     }
 
-    currentGeomIndex = currentChildIndex.sibling( i, 3 );
+    currentGeomIndex = currentChildIndex.sibling( i, dbtmGeomCol );
     if ( !currentGeomIndex.isValid() )
     {
       continue;
@@ -160,7 +159,7 @@ void QgsDbTableModel::setGeometryTypesForTable( const QString& schema, const QSt
 
   //find schema item and table item
   QStandardItem* schemaItem;
-  QList<QStandardItem*> schemaItems = findItems( schema, Qt::MatchExactly, 0 );
+  QList<QStandardItem*> schemaItems = findItems( schema, Qt::MatchExactly, dbtmSchema );
 
   if ( schemaItems.size() < 1 )
   {
@@ -177,7 +176,7 @@ void QgsDbTableModel::setGeometryTypesForTable( const QString& schema, const QSt
 
   for ( int i = 0; i < numChildren; ++i )
   {
-    currentChildIndex = indexFromItem( schemaItem->child( i, 0 ) );
+    currentChildIndex = indexFromItem( schemaItem->child( i, dbtmSchema ) );
     if ( !currentChildIndex.isValid() )
     {
       continue;

src/app/qgsdbtablemodel.h

@@ -22,7 +22,7 @@ class QIcon;
 /**A model that holds the tables of a database in a hierarchy where the
 schemas are the root elements that contain the individual tables as children.
 The tables have the following columns: Type, Schema, Tablename, Geometry Column, Sql*/
-class QgsDbTableModel: public QStandardItemModel
+class QgsDbTableModel : public QStandardItemModel
 {
     Q_OBJECT
   public: