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Improve handling of estimated metadata (fixes #5227 fixes #5252)

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szekerest 2012-04-01 21:51:32 +02:00 committed by Juergen E. Fischer
parent fad13f407d
commit 51011559c4
4 changed files with 63 additions and 46 deletions
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4
src/providers/mssql/qgsmssqldataitems.cpp
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@ -53,10 +53,14 @@ QgsMssqlConnectionItem::QgsMssqlConnectionItem( QgsDataItem* parent, QString nam
}
mUseGeometryColumns = settings.value( key + "/geometryColumns", false ).toBool();
mUseEstimatedMetadata = settings.value( key + "/estimatedMetadata", false ).toBool();
mAllowGeometrylessTables = settings.value( key + "/allowGeometrylessTables", true ).toBool();
mConnInfo = "dbname='" + mDatabase + "' host=" + mHost + " user='" + mUsername + "' password='" + mPassword + "'";
if ( !mService.isEmpty() )
mConnInfo += " service='" + mService + "'";
if ( mUseEstimatedMetadata )
mConnInfo += " estimatedmetadata=true";
}
QgsMssqlConnectionItem::~QgsMssqlConnectionItem()

2
src/providers/mssql/qgsmssqldataitems.h
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@ -81,6 +81,8 @@ class QgsMssqlConnectionItem : public QgsDataCollectionItem
QString mUsername;
QString mPassword;
bool mUseGeometryColumns;
bool mUseEstimatedMetadata;
bool mAllowGeometrylessTables;
};
class QgsMssqlSchemaItem : public QgsDataCollectionItem

78
src/providers/mssql/qgsmssqlprovider.cpp
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@ -59,11 +59,20 @@ QgsMssqlProvider::QgsMssqlProvider( QString uri )
{
QgsDataSourceURI anUri = QgsDataSourceURI( uri );
if ( !anUri.srid().isEmpty() )
mSRId = anUri.srid().toInt();
else
mSRId = -1;
mWkbType = anUri.wkbType();
mValid = true;
mUseWkb = false;
mSkipFailures = true;
mUseEstimatedMetadata = anUri.useEstimatedMetadata();
mDatabase = GetDatabase( anUri.service(), anUri.host(), anUri.database(), anUri.username(), anUri.password() );
if ( !OpenDatabase( mDatabase ) )
@ -108,9 +117,10 @@ QgsMssqlProvider::QgsMssqlProvider( QString uri )
if ( !anUri.geometryColumn().isEmpty() )
mGeometryColName = anUri.geometryColumn();
if ( mSRId < 0 || mWkbType == QGis::WKBUnknown || mGeometryColName.isEmpty() )
loadMetadata();
loadFields();
UpdateStatistics();
UpdateStatistics( mUseEstimatedMetadata );
if ( mGeometryColName.isEmpty() )
{
@ -578,48 +588,44 @@ void QgsMssqlProvider::select( QgsAttributeList fetchAttributes,
}
// update the extent, feature count, wkb type and srid for this layer
void QgsMssqlProvider::UpdateStatistics()
void QgsMssqlProvider::UpdateStatistics( bool estimate )
{
mNumberFeatures = 0;
// get features to calculate the statistics
QString statement;
if ( estimate )
{
statement = QString( "select min([%1].STPointN(1).STX), min([%1].STPointN(1).STY), max([%1].STPointN(1).STX), max([%1].STPointN(1).STY), COUNT([%1])" ).arg( mGeometryColName );
}
else
{
statement = QString( "select min([%1].STEnvelope().STPointN(1).STX), min([%1].STEnvelope().STPointN(1).STY), max([%1].STEnvelope().STPointN(2).STX), max([%1].STEnvelope().STPointN(2).STY), count([%1])" ).arg( mGeometryColName );
}
if ( mSchemaName.isEmpty() )
statement += QString( " from [%1]" ).arg( mTableName );
else
statement += QString( " from [%1].[%2]" ).arg( mSchemaName, mTableName );
mQuery = QSqlQuery( mDatabase );
mQuery.setForwardOnly( true );
if ( mSchemaName.isEmpty() )
mQuery.exec( QString( "select [%1] from [%2]" ).arg( mGeometryColName, mTableName ) );
else
mQuery.exec( QString( "select [%1] from [%2].[%3]" ).arg( mGeometryColName, mSchemaName, mTableName ) );
if ( !mQuery.exec( statement ) )
{
QString msg = mQuery.lastError().text();
QgsDebugMsg( msg );
}
if ( mQuery.isActive() )
{
QgsGeometry geom;
while ( mQuery.next() )
if ( mQuery.next() )
{
QByteArray ar = mQuery.value( 0 ).toByteArray();
unsigned char* wkb = parser.ParseSqlGeometry(( unsigned char* )ar.data(), ar.size() );
if ( wkb )
{
geom.fromWkb( wkb, parser.GetWkbLen() );
QgsRectangle rect = geom.boundingBox();
if ( mNumberFeatures > 0 )
{
if ( rect.xMinimum() < mExtent.xMinimum() )
mExtent.setXMinimum( rect.xMinimum() );
if ( rect.yMinimum() < mExtent.yMinimum() )
mExtent.setYMinimum( rect.yMinimum() );
if ( rect.xMaximum() > mExtent.xMaximum() )
mExtent.setXMaximum( rect.xMaximum() );
if ( rect.yMaximum() > mExtent.yMaximum() )
mExtent.setYMaximum( rect.yMaximum() );
}
else
{
mExtent = rect;
mWkbType = geom.wkbType();
mSRId = parser.GetSRSId();
}
++mNumberFeatures;
}
mExtent.setXMinimum( mQuery.value( 0 ).toDouble() );
mExtent.setYMinimum( mQuery.value( 1 ).toDouble() );
mExtent.setXMaximum( mQuery.value( 2 ).toDouble() );
mExtent.setYMaximum( mQuery.value( 3 ).toDouble() );
mNumberFeatures = mQuery.value( 4 ).toInt();
}
}
}
@ -628,7 +634,7 @@ void QgsMssqlProvider::UpdateStatistics()
QgsRectangle QgsMssqlProvider::extent()
{
if ( mExtent.isEmpty() )
UpdateStatistics();
UpdateStatistics( mUseEstimatedMetadata );
return mExtent;
}
@ -1064,6 +1070,9 @@ int QgsMssqlProvider::capabilities() const
bool QgsMssqlProvider::createSpatialIndex()
{
if ( mUseEstimatedMetadata )
UpdateStatistics( false );
mQuery = QSqlQuery( mDatabase );
mQuery.setForwardOnly( true );
QString statement;
@ -1468,6 +1477,7 @@ QgsVectorLayerImport::ImportError QgsMssqlProvider::createEmptyLayer(
// clear any resources hold by the query
q.clear();
q.setForwardOnly( true );
// use the provider to edit the table
dsUri.setDataSource( schemaName, tableName, geometryColumn, QString(), primaryKey );

3
src/providers/mssql/qgsmssqlprovider.h
View File

@ -171,7 +171,7 @@ class QgsMssqlProvider : public QgsVectorDataProvider
virtual uint fieldCount() const;
/** update the extent, feature count, wkb type and srid for this layer */
void UpdateStatistics();
void UpdateStatistics( bool estimate );
/**
* Return a map of indexes with field names for this layer
@ -302,6 +302,7 @@ class QgsMssqlProvider : public QgsVectorDataProvider
bool mValid;
bool mUseWkb;
bool mUseEstimatedMetadata;
bool mSkipFailures;
int mGeomType;