oracle provider: verify existence of layer style table before trying to retrieve a style

Author: jef-n

src/providers/oracle/ocispatial/qsql_ocispatial.cpp

@@ -3163,9 +3163,7 @@ bool QOCISpatialResult::exec()
     qOraWarning( "Unable to get statement type:", d->err );
     setLastError( qMakeError( QCoreApplication::translate( "QOCISpatialResult",
                               "Unable to get statement type" ), QSqlError::StatementError, d->err ) );
-#ifdef QOCISPATIAL_DEBUG
-    qDebug() << "lastQuery()" << lastQuery();
-#endif
+    qWarning( "type retrieval failed with statement:%s", lastQuery().toLocal8Bit().constData() );
     return false;
   }
 
@@ -3189,9 +3187,7 @@ bool QOCISpatialResult::exec()
     qOraWarning( "unable to bind value: ", d->err );
     setLastError( qMakeError( QCoreApplication::translate( "QOCISpatialResult", "Unable to bind value" ),
                               QSqlError::StatementError, d->err ) );
-#ifdef QOCISPATIAL_DEBUG
-    qDebug() << "lastQuery()" << lastQuery();
-#endif
+    qWarning( "bind failed with statement:%s", lastQuery().toLocal8Bit().constData() );
     return false;
   }
 
@@ -3202,9 +3198,7 @@ bool QOCISpatialResult::exec()
     qOraWarning( "unable to execute statement:", d->err );
     setLastError( qMakeError( QCoreApplication::translate( "QOCISpatialResult",
                               "Unable to execute statement" ), QSqlError::StatementError, d->err ) );
-#ifdef QOCISPATIAL_DEBUG
-    qDebug() << "lastQuery()" << lastQuery();
-#endif
+    qWarning( "execution failed with statement:%s", lastQuery().toLocal8Bit().constData() );
     return false;
   }
 

src/providers/oracle/qgsoracleprovider.cpp

@@ -3402,19 +3402,25 @@ QGISEXTERN QString loadStyle( const QString &uri, QString &errCause )
   QSqlQuery qry( *conn );
 
   QString style;
-  if ( !qry.exec( QString( "SELECT styleQML FROM ("
-                           "SELECT styleQML"
-                           " FROM layer_styles"
-                           " WHERE f_table_catalog=%1"
-                           " AND f_table_schema=%2"
-                           " AND f_table_name=%3"
-                           " AND f_geometry_column=%4"
-                           " ORDER BY useAsDefault DESC"
-                           ") WHERE rownum=1" )
-                  .arg( QgsOracleConn::quotedValue( dsUri.database() ) )
-                  .arg( QgsOracleConn::quotedValue( dsUri.schema() ) )
-                  .arg( QgsOracleConn::quotedValue( dsUri.table() ) )
-                  .arg( QgsOracleConn::quotedValue( dsUri.geometryColumn() ) ) ) )
+  if ( !qry.exec( "SELECT COUNT(*) FROM user_tables WHERE table_name='LAYER_STYLES'" ) || !qry.next() || qry.value( 0 ).toInt() == 0 )
+  {
+    errCause = QObject::tr( "Unable layer style table not found [%1]" ).arg( qry.lastError().text() );
+    conn->disconnect();
+    return QString::null;
+  }
+  else if ( !qry.exec( QString( "SELECT styleQML FROM ("
+                                "SELECT styleQML"
+                                " FROM layer_styles"
+                                " WHERE f_table_catalog=%1"
+                                " AND f_table_schema=%2"
+                                " AND f_table_name=%3"
+                                " AND f_geometry_column=%4"
+                                " ORDER BY useAsDefault DESC"
+                                ") WHERE rownum=1" )
+                       .arg( QgsOracleConn::quotedValue( dsUri.database() ) )
+                       .arg( QgsOracleConn::quotedValue( dsUri.schema() ) )
+                       .arg( QgsOracleConn::quotedValue( dsUri.table() ) )
+                       .arg( QgsOracleConn::quotedValue( dsUri.geometryColumn() ) ) ) )
   {
     errCause = QObject::tr( "Could not retrieve style [%1]" ).arg( qry.lastError().text() );
   }