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qgspostgresprovider.cpp
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qgspostgresprovider.cpp
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/***************************************************************************
qgspostgresprovider.cpp - QGIS data provider for PostgreSQL/PostGIS layers
-------------------
begin : 2004/01/07
copyright : (C) 2004 by Gary E.Sherman
email : sherman at mrcc.com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include <qgsapplication.h>
#include <qgsfeature.h>
#include <qgsfield.h>
#include <qgsgeometry.h>
#include <qgsmessageoutput.h>
#include <qgsmessagelog.h>
#include <qgsrectangle.h>
#include <qgscoordinatereferencesystem.h>
#include "qgsvectorlayerimport.h"
#include "qgsprovidercountcalcevent.h"
#include "qgsproviderextentcalcevent.h"
#include "qgspostgresprovider.h"
#include "qgspostgresconn.h"
#include "qgspgsourceselect.h"
#include "qgspostgresdataitems.h"
#include "qgslogger.h"
const QString POSTGRES_KEY = "postgres";
const QString POSTGRES_DESCRIPTION = "PostgreSQL/PostGIS data provider";
int QgsPostgresProvider::sProviderIds = 0;
const int QgsPostgresProvider::sFeatureQueueSize = 2000;
QgsPostgresProvider::QgsPostgresProvider( QString const & uri )
: QgsVectorDataProvider( uri )
, mFetching( false )
, mValid( false )
, mPrimaryKeyType( pktUnknown )
, mSpatialColType( sctNone )
, mDetectedGeomType( QGis::WKBUnknown )
, mRequestedGeomType( QGis::WKBUnknown )
, mFeatureQueueSize( sFeatureQueueSize )
, mUseEstimatedMetadata( false )
, mSelectAtIdDisabled( false )
, mConnectionRO( 0 )
, mConnectionRW( 0 )
, mFidCounter( 0 )
{
mProviderId = sProviderIds++;
QgsDebugMsg( QString( "URI: %1 " ).arg( uri ) );
mUri = QgsDataSourceURI( uri );
// populate members from the uri structure
mSchemaName = mUri.schema();
mTableName = mUri.table();
mGeometryColumn = mUri.geometryColumn();
mSqlWhereClause = mUri.sql();
mRequestedSrid = mUri.srid();
mRequestedGeomType = mUri.wkbType();
if ( mSchemaName.isEmpty() && mTableName.startsWith( "(" ) && mTableName.endsWith( ")" ) )
{
mIsQuery = true;
mQuery = mTableName;
mTableName = "";
}
else
{
mIsQuery = false;
if ( !mSchemaName.isEmpty() )
{
mQuery += quotedIdentifier( mSchemaName ) + ".";
}
if ( !mTableName.isEmpty() )
{
mQuery += quotedIdentifier( mTableName );
}
}
mUseEstimatedMetadata = mUri.useEstimatedMetadata();
mSelectAtIdDisabled = mUri.selectAtIdDisabled();
QgsDebugMsg( QString( "Connection info is %1" ).arg( mUri.connectionInfo() ) );
QgsDebugMsg( QString( "Geometry column is: %1" ).arg( mGeometryColumn ) );
QgsDebugMsg( QString( "Schema is: %1" ).arg( mSchemaName ) );
QgsDebugMsg( QString( "Table name is: %1" ).arg( mTableName ) );
QgsDebugMsg( QString( "Query is: %1" ).arg( mQuery ) );
QgsDebugMsg( QString( "Where clause is: %1" ).arg( mSqlWhereClause ) );
// no table/query passed, the provider could be used to get tables
if ( mQuery.isEmpty() )
{
return;
}
mConnectionRO = QgsPostgresConn::connectDb( mUri.connectionInfo(), true );
if ( !mConnectionRO )
{
return;
}
if ( !hasSufficientPermsAndCapabilities() ) // check permissions and set capabilities
{
disconnectDb();
return;
}
if ( !getGeometryDetails() ) // gets srid, geometry and data type
{
// the table is not a geometry table
QgsMessageLog::logMessage( tr( "invalid PostgreSQL layer" ), tr( "PostGIS" ) );
disconnectDb();
return;
}
if ( mSpatialColType == sctTopoGeometry )
{
if ( !getTopoLayerInfo() ) // gets topology name and layer id
{
QgsMessageLog::logMessage( tr( "invalid PostgreSQL topology layer" ), tr( "PostGIS" ) );
disconnectDb();
return;
}
}
mLayerExtent.setMinimal();
mFeaturesCounted = -1;
// set the primary key
if ( !determinePrimaryKey() )
{
mValid = false;
disconnectDb();
return;
}
// Set the postgresql message level so that we don't get the
// 'there is no transaction in progress' warning.
#ifndef QGISDEBUG
mConnectionRO->PQexecNR( "set client_min_messages to error" );
#endif
//fill type names into sets
mNativeTypes
// integer types
<< QgsVectorDataProvider::NativeType( tr( "Whole number (smallint - 16bit)" ), "int2", QVariant::Int )
<< QgsVectorDataProvider::NativeType( tr( "Whole number (integer - 32bit)" ), "int4", QVariant::Int )
<< QgsVectorDataProvider::NativeType( tr( "Whole number (integer - 64bit)" ), "int8", QVariant::LongLong )
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (numeric)" ), "numeric", QVariant::Double, 1, 20, 0, 20 )
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (decimal)" ), "decimal", QVariant::Double, 1, 20, 0, 20 )
// floating point
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (real)" ), "real", QVariant::Double )
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (double)" ), "double precision", QVariant::Double )
// string types
<< QgsVectorDataProvider::NativeType( tr( "Text, fixed length (char)" ), "char", QVariant::String, 1, 255 )
<< QgsVectorDataProvider::NativeType( tr( "Text, limited variable length (varchar)" ), "varchar", QVariant::String, 1, 255 )
<< QgsVectorDataProvider::NativeType( tr( "Text, unlimited length (text)" ), "text", QVariant::String )
;
QString key;
switch ( mPrimaryKeyType )
{
case pktOid:
key = "oid";
break;
case pktTid:
key = "tid";
break;
case pktInt:
Q_ASSERT( mPrimaryKeyAttrs.size() == 1 );
Q_ASSERT( mAttributeFields.contains( mPrimaryKeyAttrs[0] ) );
key = mAttributeFields[ mPrimaryKeyAttrs[0] ].name();
break;
case pktFidMap:
{
QString delim;
foreach ( int idx, mPrimaryKeyAttrs )
{
key += delim + mAttributeFields[ idx ].name();
delim = ",";
}
}
break;
case pktUnknown:
mValid = false;
break;
}
if ( mValid )
{
mUri.setKeyColumn( key );
setDataSourceUri( mUri.uri() );
}
else
{
disconnectDb();
}
}
QgsPostgresProvider::~QgsPostgresProvider()
{
disconnectDb();
QgsDebugMsg( "deconstructing." );
}
void QgsPostgresProvider::disconnectDb()
{
if ( mFetching )
{
mConnectionRO->closeCursor( QString( "qgisf%1" ).arg( mProviderId ) );
mFetching = false;
}
if ( mConnectionRO )
{
mConnectionRO->disconnect();
mConnectionRO = 0;
}
if ( mConnectionRW )
{
mConnectionRW->disconnect();
mConnectionRW = 0;
}
}
QString QgsPostgresProvider::storageType() const
{
return "PostgreSQL database with PostGIS extension";
}
bool QgsPostgresProvider::declareCursor(
const QString &cursorName,
const QgsAttributeList &fetchAttributes,
bool fetchGeometry,
QString whereClause )
{
if ( fetchGeometry && mGeometryColumn.isNull() )
{
return false;
}
try
{
QString query = "SELECT ", delim = "";
if ( fetchGeometry )
{
query += QString( "%1(%2(%3%4),'%5')" )
.arg( mConnectionRO->majorVersion() < 2 ? "asbinary" : "st_asbinary" )
.arg( mConnectionRO->majorVersion() < 2 ? "force_2d" : "st_force_2d" )
.arg( quotedIdentifier( mGeometryColumn ) )
.arg( mSpatialColType == sctGeography ? "::geometry" : "" )
.arg( endianString() );
delim = ",";
}
switch ( mPrimaryKeyType )
{
case pktOid:
query += delim + "oid";
delim = ",";
break;
case pktTid:
query += delim + "ctid";
delim = ",";
break;
case pktInt:
query += delim + quotedIdentifier( field( mPrimaryKeyAttrs[0] ).name() );
delim = ",";
break;
case pktFidMap:
foreach ( int idx, mPrimaryKeyAttrs )
{
query += delim + mConnectionRO->fieldExpression( field( idx ) );
delim = ",";
}
break;
case pktUnknown:
QgsDebugMsg( "Cannot declare cursor without primary key." );
return false;
break;
}
foreach ( int idx, fetchAttributes )
{
if ( mPrimaryKeyAttrs.contains( idx ) )
continue;
query += delim + mConnectionRO->fieldExpression( field( idx ) );
}
query += " FROM " + mQuery;
if ( !whereClause.isEmpty() )
query += QString( " WHERE %1" ).arg( whereClause );
if ( !mConnectionRO->openCursor( cursorName, query ) )
{
// reloading the fields might help next time around
rewind();
return false;
}
}
catch ( PGFieldNotFound )
{
rewind();
return false;
}
return true;
}
static bool operator<( const QVariant &a, const QVariant &b )
{
if ( a.isNull() || b.isNull() )
return false;
if ( a.type() == b.type() )
{
switch ( a.type() )
{
case QVariant::Int:
case QVariant::Char:
return a.toInt() < b.toInt();
case QVariant::Double:
return a.toDouble() < b.toDouble();
case QVariant::LongLong:
return a.toLongLong() < b.toLongLong();
case QVariant::List:
{
QList<QVariant> al = a.toList();
QList<QVariant> bl = b.toList();
int i, n = qMin( al.size(), bl.size() );
for ( i = 0; i < n && al[i] == bl[i]; i++ )
;
if ( i == n )
return al.size() < bl.size();
else
return al[i] < bl[i];
}
break;
case QVariant::StringList:
{
QStringList al = a.toStringList();
QStringList bl = b.toStringList();
int i, n = qMin( al.size(), bl.size() );
for ( i = 0; i < n && al[i] == bl[i]; i++ )
;
if ( i == n )
return al.size() < bl.size();
else
return al[i] < bl[i];
}
break;
case QVariant::Date:
return a.toDate() < b.toDate();
case QVariant::Time:
return a.toTime() < b.toTime();
case QVariant::DateTime:
return a.toDateTime() < b.toDateTime();
case QVariant::Bool:
return a.toBool() < b.toBool();
case QVariant::UInt:
return a.toUInt() < b.toUInt();
case QVariant::ULongLong:
return a.toULongLong() < b.toULongLong();
default:
break;
}
}
return a.canConvert( QVariant::String ) && b.canConvert( QVariant::String ) && a.toString() < b.toString();
}
QgsFeatureId QgsPostgresProvider::lookupFid( const QVariant &v )
{
QMap<QVariant, QgsFeatureId>::const_iterator it = mKeyToFid.find( v );
if ( it != mKeyToFid.constEnd() )
{
return it.value();
}
mFidToKey.insert( ++mFidCounter, v );
mKeyToFid.insert( v, mFidCounter );
return mFidCounter;
}
bool QgsPostgresProvider::getFeature( QgsPostgresResult &queryResult, int row, bool fetchGeometry,
QgsFeature &feature,
const QgsAttributeList &fetchAttributes )
{
try
{
feature.clearAttributeMap();
int col = 0;
if ( fetchGeometry )
{
int returnedLength = ::PQgetlength( queryResult.result(), row, col );
if ( returnedLength > 0 )
{
unsigned char *featureGeom = new unsigned char[returnedLength + 1];
memset( featureGeom, 0, returnedLength + 1 );
memcpy( featureGeom, PQgetvalue( queryResult.result(), row, col ), returnedLength );
feature.setGeometryAndOwnership( featureGeom, returnedLength + 1 );
}
else
{
feature.setGeometryAndOwnership( 0, 0 );
QgsMessageLog::logMessage( tr( "Couldn't get the feature geometry in binary form" ), tr( "PostGIS" ) );
}
col++;
}
QgsFeatureId fid = 0;
switch ( mPrimaryKeyType )
{
case pktOid:
case pktTid:
case pktInt:
fid = mConnectionRO->getBinaryInt( queryResult, row, col++ );
if ( mPrimaryKeyType == pktInt && fetchAttributes.contains( mPrimaryKeyAttrs[0] ) )
feature.addAttribute( mPrimaryKeyAttrs[0], fid );
break;
case pktFidMap:
{
QList<QVariant> primaryKeyVals;
foreach ( int idx, mPrimaryKeyAttrs )
{
const QgsField &fld = field( idx );
QVariant v = convertValue( fld.type(), queryResult.PQgetvalue( row, col ) );
primaryKeyVals << v;
if ( fetchAttributes.contains( idx ) )
feature.addAttribute( idx, v );
col++;
}
fid = lookupFid( QVariant( primaryKeyVals ) );
}
break;
case pktUnknown:
Q_ASSERT( !"FAILURE: cannot get feature with unknown primary key" );
return false;
}
feature.setFeatureId( fid );
QgsDebugMsgLevel( QString( "fid=%1" ).arg( fid ), 4 );
// iterate attributes
foreach ( int idx, fetchAttributes )
{
if ( mPrimaryKeyAttrs.contains( idx ) )
continue;
const QgsField &fld = field( idx );
QVariant v = convertValue( fld.type(), queryResult.PQgetvalue( row, col ) );
feature.addAttribute( idx, v );
col++;
}
return true;
}
catch ( PGFieldNotFound )
{
return false;
}
}
void QgsPostgresProvider::select( QgsAttributeList fetchAttributes, QgsRectangle rect, bool fetchGeometry, bool useIntersect )
{
QString cursorName = QString( "qgisf%1" ).arg( mProviderId );
if ( mFetching )
{
mConnectionRO->closeCursor( cursorName );
mFetching = false;
while ( !mFeatureQueue.empty() )
{
mFeatureQueue.dequeue();
}
}
QString whereClause;
if ( !rect.isEmpty() && !mGeometryColumn.isNull() )
{
if ( mSpatialColType == sctGeography )
{
rect = QgsRectangle( -180.0, -90.0, 180.0, 90.0 ).intersect( &rect );
if ( !rect.isFinite() )
whereClause = "false";
}
if ( whereClause.isEmpty() )
{
QString qBox;
if ( mConnectionRO->majorVersion() < 2 )
{
qBox = QString( "setsrid('BOX3D(%1)'::box3d,%2)" )
.arg( rect.asWktCoordinates() )
.arg( mRequestedSrid.isEmpty() ? mDetectedSrid : mRequestedSrid );
}
else
{
qBox = QString( "st_makeenvelope(%1,%2,%3,%4,%5)" )
.arg( rect.xMinimum(), 0, 'f', 16 )
.arg( rect.yMinimum(), 0, 'f', 16 )
.arg( rect.xMaximum(), 0, 'f', 16 )
.arg( rect.yMaximum(), 0, 'f', 16 )
.arg( mRequestedSrid.isEmpty() ? mDetectedSrid : mRequestedSrid );
}
whereClause = QString( "%1 && %2" )
.arg( quotedIdentifier( mGeometryColumn ) )
.arg( qBox );
if ( useIntersect )
{
whereClause += QString( " AND %1(%2%3,%4)" )
.arg( mConnectionRO->majorVersion() < 2 ? "intersects" : "st_intersects" )
.arg( quotedIdentifier( mGeometryColumn ) )
.arg( mSpatialColType == sctGeography ? "::geometry" : "" )
.arg( qBox );
}
}
if ( !mRequestedSrid.isEmpty() && mRequestedSrid != mDetectedSrid )
{
whereClause += QString( " AND %1(%2%3)=%4" )
.arg( mConnectionRO->majorVersion() < 2 ? "srid" : "st_srid" )
.arg( quotedIdentifier( mGeometryColumn ) )
.arg( mSpatialColType == sctGeography ? "::geography" : "" )
.arg( mRequestedSrid );
}
if ( mRequestedGeomType != QGis::WKBUnknown && mRequestedGeomType != mDetectedGeomType )
{
whereClause += QString( " AND %1" ).arg( QgsPostgresConn::postgisTypeFilter( mGeometryColumn, mRequestedGeomType, mSpatialColType == sctGeography ) );
}
}
if ( !mSqlWhereClause.isEmpty() )
{
if ( !whereClause.isEmpty() )
whereClause += " AND ";
whereClause += "(" + mSqlWhereClause + ")";
}
mFetchGeom = fetchGeometry;
mAttributesToFetch = fetchAttributes;
if ( !declareCursor( cursorName, fetchAttributes, fetchGeometry, whereClause ) )
return;
mFetching = true;
mFetched = 0;
}
bool QgsPostgresProvider::nextFeature( QgsFeature& feature )
{
feature.setValid( false );
if ( !mValid )
{
QgsMessageLog::logMessage( tr( "Read attempt on an invalid postgresql data source" ), tr( "PostGIS" ) );
return false;
}
if ( !mFetching )
{
QgsMessageLog::logMessage( tr( "nextFeature() without select()" ), tr( "PostGIS" ) );
return false;
}
QString cursorName = QString( "qgisf%1" ).arg( mProviderId );
if ( mFeatureQueue.empty() )
{
QString fetch = QString( "FETCH FORWARD %1 FROM %2" ).arg( mFeatureQueueSize ).arg( cursorName );
QgsDebugMsgLevel( QString( "fetching %1 features." ).arg( mFeatureQueueSize ), 3 );
if ( mConnectionRO->PQsendQuery( fetch ) == 0 ) // fetch features asynchronously
{
QgsMessageLog::logMessage( tr( "Fetching from cursor %1 failed\nDatabase error: %2" ).arg( cursorName ).arg( mConnectionRO->PQerrorMessage() ), tr( "PostGIS" ) );
}
QgsPostgresResult queryResult;
for ( ;; )
{
queryResult = mConnectionRO->PQgetResult();
if ( !queryResult.result() )
break;
if ( queryResult.PQresultStatus() != PGRES_TUPLES_OK )
{
QgsMessageLog::logMessage( tr( "Fetching from cursor %1 failed\nDatabase error: %2" ).arg( cursorName ).arg( mConnectionRO->PQerrorMessage() ), tr( "PostGIS" ) );
break;
}
int rows = queryResult.PQntuples();
if ( rows == 0 )
continue;
for ( int row = 0; row < rows; row++ )
{
mFeatureQueue.enqueue( QgsFeature() );
getFeature( queryResult, row, mFetchGeom, mFeatureQueue.back(), mAttributesToFetch );
} // for each row in queue
}
}
if ( mFeatureQueue.empty() )
{
QgsDebugMsg( QString( "Finished after %1 features" ).arg( mFetched ) );
mConnectionRO->closeCursor( cursorName );
mFetching = false;
if ( mFeaturesCounted < mFetched )
{
QgsDebugMsg( QString( "feature count adjusted from %1 to %2" ).arg( mFeaturesCounted ).arg( mFetched ) );
mFeaturesCounted = mFetched;
}
return false;
}
// Now return the next feature from the queue
if ( mFetchGeom )
{
QgsGeometry* featureGeom = mFeatureQueue.front().geometryAndOwnership();
feature.setGeometry( featureGeom );
}
else
{
feature.setGeometryAndOwnership( 0, 0 );
}
feature.setFeatureId( mFeatureQueue.front().id() );
feature.setAttributeMap( mFeatureQueue.front().attributeMap() );
mFeatureQueue.dequeue();
mFetched++;
feature.setValid( true );
return true;
}
QString QgsPostgresProvider::pkParamWhereClause( int offset, const char *alias ) const
{
QString whereClause;
QString aliased;
if ( alias ) aliased = QString( "%1." ).arg( alias );
switch ( mPrimaryKeyType )
{
case pktTid:
whereClause = QString( "%2ctid=$%1" ).arg( offset ).arg( aliased );
break;
case pktOid:
whereClause = QString( "%2oid=$%1" ).arg( offset ).arg( aliased );
break;
case pktInt:
Q_ASSERT( mPrimaryKeyAttrs.size() == 1 );
whereClause = QString( "%3%1=$%2" ).arg( quotedIdentifier( field( mPrimaryKeyAttrs[0] ).name() ) ).arg( offset ).arg( aliased );
break;
case pktFidMap:
{
QString delim = "";
for ( int i = 0; i < mPrimaryKeyAttrs.size(); i++ )
{
int idx = mPrimaryKeyAttrs[i];
const QgsField &fld = field( idx );
whereClause += delim + QString( "%3%1=$%2" ).arg( mConnectionRO->fieldExpression( fld ) ).arg( offset++ ).arg( aliased );
delim = " AND ";
}
}
break;
case pktUnknown:
Q_ASSERT( !"FAILURE: Primary key unknown" );
whereClause = "NULL";
break;
}
if ( !mSqlWhereClause.isEmpty() )
{
if ( !whereClause.isEmpty() )
whereClause += " AND ";
whereClause += "(" + mSqlWhereClause + ")";
}
return whereClause;
}
void QgsPostgresProvider::appendPkParams( QgsFeatureId featureId, QStringList ¶ms ) const
{
switch ( mPrimaryKeyType )
{
case pktOid:
case pktInt:
params << QString::number( featureId );
break;
case pktTid:
params << QString( "'(%1,%2)'" ).arg( FID_TO_NUMBER( featureId ) >> 16 ).arg( FID_TO_NUMBER( featureId ) & 0xffff );
break;
case pktFidMap:
{
QList<QVariant> pkVals;
QMap<QgsFeatureId, QVariant>::const_iterator it = mFidToKey.find( featureId );
if ( it != mFidToKey.constEnd() )
{
pkVals = it.value().toList();
Q_ASSERT( pkVals.size() == mPrimaryKeyAttrs.size() );
}
for ( int i = 0; i < mPrimaryKeyAttrs.size(); i++ )
{
if ( i < pkVals.size() )
{
params << pkVals[i].toString();
}
else
{
QgsDebugMsg( QString( "FAILURE: Key value %1 for feature %2 not found." ).arg( mPrimaryKeyAttrs[i] ).arg( featureId ) );
params << "NULL";
}
}
QgsDebugMsg( QString( "keys params: %1" ).arg( params.join( "; " ) ) );
}
break;
case pktUnknown:
Q_ASSERT( !"FAILURE: Primary key unknown" );
break;
}
}
QString QgsPostgresProvider::whereClause( QgsFeatureId featureId ) const
{
QString whereClause;
switch ( mPrimaryKeyType )
{
case pktTid:
whereClause = QString( "ctid='(%1,%2)'" )
.arg( FID_TO_NUMBER( featureId ) >> 16 )
.arg( FID_TO_NUMBER( featureId ) & 0xffff );
break;
case pktOid:
whereClause = QString( "oid=%1" ).arg( featureId );
break;
case pktInt:
Q_ASSERT( mPrimaryKeyAttrs.size() == 1 );
whereClause = QString( "%1=%2" ).arg( quotedIdentifier( field( mPrimaryKeyAttrs[0] ).name() ) ).arg( featureId );
break;
case pktFidMap:
{
QMap<QgsFeatureId, QVariant>::const_iterator it = mFidToKey.find( featureId );
if ( it != mFidToKey.constEnd() )
{
QList<QVariant> pkVals = it.value().toList();
Q_ASSERT( pkVals.size() == mPrimaryKeyAttrs.size() );
QString delim = "";
for ( int i = 0; i < mPrimaryKeyAttrs.size(); i++ )
{
int idx = mPrimaryKeyAttrs[i];
const QgsField &fld = field( idx );
whereClause += delim + QString( "%1=%2" ).arg( mConnectionRO->fieldExpression( fld ) ).arg( quotedValue( pkVals[i].toString() ) );
delim = " AND ";
}
}
else
{
QgsDebugMsg( QString( "FAILURE: Key values for feature %1 not found." ).arg( featureId ) );
whereClause = "NULL";
}
}
break;
case pktUnknown:
Q_ASSERT( !"FAILURE: Primary key unknown" );
whereClause = "NULL";
break;
}
if ( !mSqlWhereClause.isEmpty() )
{
if ( !whereClause.isEmpty() )
whereClause += " AND ";
whereClause += "(" + mSqlWhereClause + ")";
}
return whereClause;
}
bool QgsPostgresProvider::featureAtId( QgsFeatureId featureId, QgsFeature& feature, bool fetchGeometry, QgsAttributeList fetchAttributes )
{
feature.setValid( false );
#if 0
if ( mFeatureMap.contains( featureId ) )
{
QgsFeature * fpointer = &feature;
*fpointer = mFeatureMap.value( featureId );
QgsDebugMsg( QString( "retrieve feature %1 from cache" ).arg( featureId ) );
mPriorityIds.removeAll( featureId );
mPriorityIds.prepend( featureId );
return true;
}
#endif
QString cursorName = QString( "qgisfid%1" ).arg( mProviderId );
if ( !declareCursor( cursorName, fetchAttributes, fetchGeometry, whereClause( featureId ) ) )
return false;
QgsPostgresResult queryResult = mConnectionRO->PQexec( QString( "FETCH FORWARD 1 FROM %1" ).arg( cursorName ) );
int rows = queryResult.PQntuples();
if ( rows == 0 )
{
QgsMessageLog::logMessage( tr( "feature %1 not found" ).arg( featureId ), tr( "PostGIS" ) );
mConnectionRO->closeCursor( cursorName );
return false;
}
else if ( rows != 1 )
{
QgsMessageLog::logMessage( tr( "found %1 features instead of just one." ).arg( rows ), tr( "PostGIS" ) );
}
bool gotit = getFeature( queryResult, 0, fetchGeometry, feature, fetchAttributes );
mConnectionRO->closeCursor( cursorName );
feature.setValid( gotit );
#if 0
if ( gotit )
{
mFeatureMap.insert( featureId, feature );
mPriorityIds.prepend( featureId );
if ( mPriorityIds.count() == 20 )
{
mFeatureMap.remove( mPriorityIds.takeLast() );
}
}
#endif
return gotit;
}
void QgsPostgresProvider::setExtent( QgsRectangle& newExtent )
{
mLayerExtent.setXMaximum( newExtent.xMaximum() );
mLayerExtent.setXMinimum( newExtent.xMinimum() );
mLayerExtent.setYMaximum( newExtent.yMaximum() );
mLayerExtent.setYMinimum( newExtent.yMinimum() );
}
/**
* Return the feature type
*/
QGis::WkbType QgsPostgresProvider::geometryType() const
{
return mRequestedGeomType != QGis::WKBUnknown ? mRequestedGeomType : mDetectedGeomType;
}
const QgsField &QgsPostgresProvider::field( int index ) const
{
QgsFieldMap::const_iterator it = mAttributeFields.find( index );
if ( it == mAttributeFields.constEnd() )
{
QgsMessageLog::logMessage( tr( "FAILURE: Field %1 not found." ).arg( index ), tr( "PostGIS" ) );
throw PGFieldNotFound();
}
return it.value();
}
/**
* Return the number of fields
*/
uint QgsPostgresProvider::fieldCount() const
{
return mAttributeFields.size();
}
const QgsFieldMap & QgsPostgresProvider::fields() const
{
return mAttributeFields;
}
QString QgsPostgresProvider::dataComment() const
{
return mDataComment;
}
void QgsPostgresProvider::rewind()
{
if ( mFetching )
{
//move cursor to first record
mConnectionRO->PQexecNR( QString( "move 0 in qgisf%1" ).arg( mProviderId ) );
}
mFeatureQueue.empty();
loadFields();
}
/** @todo XXX Perhaps this should be promoted to QgsDataProvider? */
QString QgsPostgresProvider::endianString()
{
switch ( QgsApplication::endian() )
{
case QgsApplication::NDR:
return QString( "NDR" );
break;
case QgsApplication::XDR:
return QString( "XDR" );
break;
default :
return QString( "Unknown" );
}
}
bool QgsPostgresProvider::loadFields()
{
if ( !mIsQuery )
{
QgsDebugMsg( QString( "Loading fields for table %1" ).arg( mTableName ) );
// Get the relation oid for use in later queries
QString sql = QString( "SELECT regclass(%1)::oid" ).arg( quotedValue( mQuery ) );
QgsPostgresResult tresult = mConnectionRO->PQexec( sql );
QString tableoid = tresult.PQgetvalue( 0, 0 );
// Get the table description
sql = QString( "SELECT description FROM pg_description WHERE objoid=%1 AND objsubid=0" ).arg( tableoid );
tresult = mConnectionRO->PQexec( sql );
if ( tresult.PQntuples() > 0 )