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qgspostgresprovider.cpp
5838 lines (5023 loc) · 192 KB
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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 "qgsprojectstorageregistry.h"
#include "qgsrectangle.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsxmlutils.h"
#include "qgsvectorlayer.h"
#include <QMessageBox>
#include "qgsvectorlayerexporter.h"
#include "qgspostgresprovider.h"
#include "qgspostgresconn.h"
#include "qgspostgresconnpool.h"
#include "qgspostgresdataitems.h"
#include "qgspostgresfeatureiterator.h"
#include "qgspostgrestransaction.h"
#include "qgspostgreslistener.h"
#include "qgspostgresprojectstorage.h"
#include "qgspostgresproviderconnection.h"
#include "qgslogger.h"
#include "qgsfeedback.h"
#include "qgssettings.h"
#include "qgsjsonutils.h"
#include "qgspostgresprovider.h"
#include "qgsprovidermetadata.h"
#include "qgspostgresproviderconnection.h"
const QString QgsPostgresProvider::POSTGRES_KEY = QStringLiteral( "postgres" );
const QString QgsPostgresProvider::POSTGRES_DESCRIPTION = QStringLiteral( "PostgreSQL/PostGIS data provider" );
static const QString EDITOR_WIDGET_STYLES_TABLE = QStringLiteral( "qgis_editor_widget_styles" );
inline qint64 PKINT2FID( qint32 x )
{
return QgsPostgresUtils::int32pk_to_fid( x );
}
inline qint32 FID2PKINT( qint64 x )
{
return QgsPostgresUtils::fid_to_int32pk( x );
}
static bool tableExists( QgsPostgresConn &conn, const QString &name )
{
QgsPostgresResult res( conn.PQexec( "SELECT EXISTS ( SELECT oid FROM pg_catalog.pg_class WHERE relname=" + QgsPostgresConn::quotedValue( name ) + ")" ) );
return res.PQgetvalue( 0, 0 ).startsWith( 't' );
}
static bool columnExists( QgsPostgresConn &conn, const QString &table, const QString &column )
{
QgsPostgresResult res( conn.PQexec( "SELECT COUNT(*) FROM information_schema.columns WHERE table_name=" + QgsPostgresConn::quotedValue( table ) + " and column_name=" + QgsPostgresConn::quotedValue( column ) ) );
return res.PQgetvalue( 0, 0 ).toInt() > 0;
}
QgsPostgresPrimaryKeyType
QgsPostgresProvider::pkType( const QgsField &f ) const
{
switch ( f.type() )
{
case QVariant::LongLong:
// PostgreSQL doesn't have native "unsigned" types.
// Unsigned primary keys are emulated by the serial/bigserial
// pseudo-types, in which autogenerated values are always > 0;
// however, the database accepts manually inserted 0 and negative values
// in these fields.
return PktInt64;
case QVariant::Int:
return PktInt;
default:
return PktFidMap;
}
}
QgsPostgresProvider::QgsPostgresProvider( QString const &uri, const ProviderOptions &options,
QgsDataProvider::ReadFlags flags )
: QgsVectorDataProvider( uri, options, flags )
, mShared( new QgsPostgresSharedData )
{
QgsDebugMsgLevel( QStringLiteral( "URI: %1 " ).arg( uri ), 2 );
mUri = QgsDataSourceUri( uri );
// populate members from the uri structure
mSchemaName = mUri.schema();
mTableName = mUri.table();
mGeometryColumn = mUri.geometryColumn();
mBoundingBoxColumn = mUri.param( "bbox" );
if ( mBoundingBoxColumn.isEmpty() )
{
mBoundingBoxColumn = mGeometryColumn;
}
mSqlWhereClause = mUri.sql();
mRequestedSrid = mUri.srid();
mRequestedGeomType = mUri.wkbType();
const QString checkUnicityKey { QStringLiteral( "checkPrimaryKeyUnicity" ) };
if ( mUri.hasParam( checkUnicityKey ) )
{
if ( mUri.param( checkUnicityKey ).compare( QLatin1String( "0" ) ) == 0 )
{
mCheckPrimaryKeyUnicity = false;
}
else
{
mCheckPrimaryKeyUnicity = true;
}
if ( mReadFlags & QgsDataProvider::FlagTrustDataSource )
{
mCheckPrimaryKeyUnicity = false;
}
}
if ( mSchemaName.isEmpty() && mTableName.startsWith( '(' ) && mTableName.endsWith( ')' ) )
{
mIsQuery = true;
setQuery( mTableName );
mTableName.clear();
}
else
{
mIsQuery = false;
setQuery( ( !mSchemaName.isEmpty() ? quotedIdentifier( mSchemaName ) + '.' : QString() )
+ ( !mTableName.isEmpty() ? quotedIdentifier( mTableName ) : QString() ) );
}
mUseEstimatedMetadata = mUri.useEstimatedMetadata();
if ( mReadFlags & QgsDataProvider::FlagTrustDataSource )
{
mUseEstimatedMetadata = true;
}
mSelectAtIdDisabled = mUri.selectAtIdDisabled();
QgsDebugMsgLevel( QStringLiteral( "Connection info is %1" ).arg( mUri.connectionInfo( false ) ), 2 );
QgsDebugMsgLevel( QStringLiteral( "Geometry column is: %1" ).arg( mGeometryColumn ), 2 );
QgsDebugMsgLevel( QStringLiteral( "Schema is: %1" ).arg( mSchemaName ), 2 );
QgsDebugMsgLevel( QStringLiteral( "Table name is: %1" ).arg( mTableName ), 2 );
QgsDebugMsgLevel( QStringLiteral( "Query is: %1" ).arg( mQuery ), 2 );
QgsDebugMsgLevel( QStringLiteral( "Where clause is: %1" ).arg( mSqlWhereClause ), 2 );
// no table/query passed, the provider could be used to get tables
if ( mQuery.isEmpty() )
{
return;
}
mConnectionRO = QgsPostgresConn::connectDb( mUri.connectionInfo( false ), 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;
}
// NOTE: mValid would be true after true return from
// getGeometryDetails, see https://github.com/qgis/QGIS/issues/21807
if ( mSpatialColType == SctTopoGeometry )
{
if ( !getTopoLayerInfo() ) // gets topology name and layer id
{
QgsMessageLog::logMessage( tr( "Invalid PostgreSQL topology layer" ), tr( "PostGIS" ) );
mValid = false;
disconnectDb();
return;
}
}
mLayerExtent.setMinimal();
// set the primary key
if ( !determinePrimaryKey() )
{
QgsMessageLog::logMessage( tr( "PostgreSQL layer has no primary key." ), tr( "PostGIS" ) );
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( QStringLiteral( "set client_min_messages to error" ) );
#endif
setNativeTypes( mConnectionRO->nativeTypes() );
QString key;
switch ( mPrimaryKeyType )
{
case PktOid:
key = QStringLiteral( "oid" );
break;
case PktTid:
key = QStringLiteral( "tid" );
break;
case PktInt:
Q_ASSERT( mPrimaryKeyAttrs.size() == 1 );
Q_ASSERT( mPrimaryKeyAttrs[0] >= 0 && mPrimaryKeyAttrs[0] < mAttributeFields.count() );
key = mAttributeFields.at( mPrimaryKeyAttrs.at( 0 ) ).name();
break;
case PktInt64:
case PktUint64:
case PktFidMap:
{
QString delim;
const auto constMPrimaryKeyAttrs = mPrimaryKeyAttrs;
for ( int idx : constMPrimaryKeyAttrs )
{
key += delim + mAttributeFields.at( idx ).name();
delim = ',';
}
}
break;
case PktUnknown:
QgsMessageLog::logMessage( tr( "PostgreSQL layer has unknown primary key type." ), tr( "PostGIS" ) );
mValid = false;
break;
}
if ( mValid )
{
mUri.setKeyColumn( key );
setDataSourceUri( mUri.uri( false ) );
}
else
{
disconnectDb();
}
mLayerMetadata.setType( QStringLiteral( "dataset" ) );
mLayerMetadata.setCrs( crs() );
}
QgsPostgresProvider::~QgsPostgresProvider()
{
disconnectDb();
QgsDebugMsgLevel( QStringLiteral( "deconstructing." ), 3 );
}
QgsAbstractFeatureSource *QgsPostgresProvider::featureSource() const
{
return new QgsPostgresFeatureSource( this );
}
QgsPostgresConn *QgsPostgresProvider::connectionRO() const
{
return mTransaction ? mTransaction->connection() : mConnectionRO;
}
void QgsPostgresProvider::setListening( bool isListening )
{
if ( isListening && !mListener )
{
mListener.reset( QgsPostgresListener::create( mUri.connectionInfo( false ) ).release() );
connect( mListener.get(), &QgsPostgresListener::notify, this, &QgsPostgresProvider::notify );
}
else if ( !isListening && mListener )
{
disconnect( mListener.get(), &QgsPostgresListener::notify, this, &QgsPostgresProvider::notify );
mListener.reset();
}
}
void QgsPostgresProvider::reloadProviderData()
{
mShared->setFeaturesCounted( -1 );
mLayerExtent.setMinimal();
}
QgsPostgresConn *QgsPostgresProvider::connectionRW()
{
if ( mTransaction )
{
return mTransaction->connection();
}
else if ( !mConnectionRW )
{
mConnectionRW = QgsPostgresConn::connectDb( mUri.connectionInfo( false ), false );
}
return mConnectionRW;
}
QgsTransaction *QgsPostgresProvider::transaction() const
{
return mTransaction;
}
QString QgsPostgresProvider::providerKey()
{
return POSTGRES_KEY;
}
void QgsPostgresProvider::setTransaction( QgsTransaction *transaction )
{
// static_cast since layers cannot be added to a transaction of a non-matching provider
mTransaction = static_cast<QgsPostgresTransaction *>( transaction );
}
void QgsPostgresProvider::disconnectDb()
{
if ( mConnectionRO )
{
mConnectionRO->unref();
mConnectionRO = nullptr;
}
if ( mConnectionRW )
{
mConnectionRW->unref();
mConnectionRW = nullptr;
}
}
QString QgsPostgresProvider::quotedByteaValue( const QVariant &value )
{
if ( value.isNull() )
return QStringLiteral( "NULL" );
const QByteArray ba = value.toByteArray();
const unsigned char *buf = reinterpret_cast< const unsigned char * >( ba.constData() );
QString param;
param.reserve( ba.length() * 4 );
for ( int i = 0; i < ba.length(); ++i )
{
param += QStringLiteral( "\\%1" ).arg( static_cast< int >( buf[i] ), 3, 8, QChar( '0' ) );
}
return QStringLiteral( "decode('%1','escape')" ).arg( param );
}
QString QgsPostgresProvider::storageType() const
{
return QStringLiteral( "PostgreSQL database with PostGIS extension" );
}
QgsFeatureIterator QgsPostgresProvider::getFeatures( const QgsFeatureRequest &request ) const
{
if ( !mValid )
{
QgsMessageLog::logMessage( tr( "Read attempt on an invalid PostgreSQL data source" ), tr( "PostGIS" ) );
return QgsFeatureIterator();
}
QgsPostgresFeatureSource *featureSrc = static_cast<QgsPostgresFeatureSource *>( featureSource() );
return QgsFeatureIterator( new QgsPostgresFeatureIterator( featureSrc, true, request ) );
}
QString QgsPostgresProvider::pkParamWhereClause( int offset, const char *alias ) const
{
QString whereClause;
QString aliased;
if ( alias ) aliased = QStringLiteral( "%1." ).arg( alias );
switch ( mPrimaryKeyType )
{
case PktTid:
whereClause = QStringLiteral( "%2ctid=$%1" ).arg( offset ).arg( aliased );
break;
case PktOid:
whereClause = QStringLiteral( "%2oid=$%1" ).arg( offset ).arg( aliased );
break;
case PktInt:
Q_ASSERT( mPrimaryKeyAttrs.size() == 1 );
whereClause = QStringLiteral( "%3%1=$%2" ).arg( quotedIdentifier( field( mPrimaryKeyAttrs[0] ).name() ) ).arg( offset ).arg( aliased );
break;
case PktInt64:
case PktUint64:
case PktFidMap:
{
QString delim;
for ( int i = 0; i < mPrimaryKeyAttrs.size(); i++ )
{
int idx = mPrimaryKeyAttrs[i];
QgsField fld = field( idx );
whereClause += delim + QStringLiteral( "%3%1=$%2" ).arg( connectionRO()->fieldExpressionForWhereClause( fld ) ).arg( offset++ ).arg( aliased );
delim = QStringLiteral( " AND " );
}
}
break;
case PktUnknown:
Q_ASSERT( !"FAILURE: Primary key unknown" );
whereClause = QStringLiteral( "NULL" );
break;
}
if ( !mSqlWhereClause.isEmpty() )
{
if ( !whereClause.isEmpty() )
whereClause += QLatin1String( " AND " );
whereClause += '(' + mSqlWhereClause + ')';
}
return whereClause;
}
void QgsPostgresProvider::appendPkParams( QgsFeatureId featureId, QStringList ¶ms ) const
{
switch ( mPrimaryKeyType )
{
case PktOid:
params << QString::number( featureId );
break;
case PktInt:
params << QString::number( FID2PKINT( featureId ) );
break;
case PktTid:
params << QStringLiteral( "'(%1,%2)'" ).arg( FID_TO_NUMBER( featureId ) >> 16 ).arg( FID_TO_NUMBER( featureId ) & 0xffff );
break;
case PktInt64:
case PktUint64:
case PktFidMap:
{
QVariantList pkVals = mShared->lookupKey( featureId );
if ( !pkVals.isEmpty() )
{
Q_ASSERT( pkVals.size() == mPrimaryKeyAttrs.size() );
}
for ( int i = 0; i < mPrimaryKeyAttrs.size(); i++ )
{
if ( i < pkVals.size() )
{
params << pkVals[i].toString();
}
else
{
QgsDebugMsg( QStringLiteral( "FAILURE: Key value %1 for feature %2 not found." ).arg( mPrimaryKeyAttrs[i] ).arg( featureId ) );
params << QStringLiteral( "NULL" );
}
}
QgsDebugMsgLevel( QStringLiteral( "keys params: %1" ).arg( params.join( "; " ) ), 2 );
}
break;
case PktUnknown:
Q_ASSERT( !"FAILURE: Primary key unknown" );
break;
}
}
QString QgsPostgresProvider::whereClause( QgsFeatureId featureId ) const
{
return QgsPostgresUtils::whereClause( featureId, mAttributeFields, connectionRO(), mPrimaryKeyType, mPrimaryKeyAttrs, mShared );
}
QString QgsPostgresProvider::whereClause( QgsFeatureIds featureIds ) const
{
return QgsPostgresUtils::whereClause( featureIds, mAttributeFields, connectionRO(), mPrimaryKeyType, mPrimaryKeyAttrs, mShared );
}
QString QgsPostgresUtils::whereClause( QgsFeatureId featureId, const QgsFields &fields, QgsPostgresConn *conn, QgsPostgresPrimaryKeyType pkType, const QList<int> &pkAttrs, const std::shared_ptr<QgsPostgresSharedData> &sharedData )
{
QString whereClause;
switch ( pkType )
{
case PktTid:
whereClause = QStringLiteral( "ctid='(%1,%2)'" )
.arg( FID_TO_NUMBER( featureId ) >> 16 )
.arg( FID_TO_NUMBER( featureId ) & 0xffff );
break;
case PktOid:
whereClause = QStringLiteral( "oid=%1" ).arg( featureId );
break;
case PktInt:
Q_ASSERT( pkAttrs.size() == 1 );
whereClause = QStringLiteral( "%1=%2" ).arg( QgsPostgresConn::quotedIdentifier( fields.at( pkAttrs[0] ).name() ) ).arg( FID2PKINT( featureId ) );
break;
case PktInt64:
case PktUint64:
{
Q_ASSERT( pkAttrs.size() == 1 );
QVariantList pkVals = sharedData->lookupKey( featureId );
if ( !pkVals.isEmpty() )
{
QgsField fld = fields.at( pkAttrs[0] );
whereClause = conn->fieldExpression( fld );
if ( !pkVals[0].isNull() )
whereClause += '=' + pkVals[0].toString();
else
whereClause += QLatin1String( " IS NULL" );
}
}
break;
case PktFidMap:
{
QVariantList pkVals = sharedData->lookupKey( featureId );
if ( !pkVals.isEmpty() )
{
Q_ASSERT( pkVals.size() == pkAttrs.size() );
QString delim;
for ( int i = 0; i < pkAttrs.size(); i++ )
{
int idx = pkAttrs[i];
QgsField fld = fields.at( idx );
whereClause += delim + conn->fieldExpressionForWhereClause( fld, pkVals[i].type() );
if ( pkVals[i].isNull() )
whereClause += QLatin1String( " IS NULL" );
else
whereClause += '=' + QgsPostgresConn::quotedValue( pkVals[i] ); // remove toString as it must be handled by quotedValue function
delim = QStringLiteral( " AND " );
}
}
else
{
QgsDebugMsg( QStringLiteral( "FAILURE: Key values for feature %1 not found." ).arg( featureId ) );
whereClause = QStringLiteral( "NULL" );
}
}
break;
case PktUnknown:
Q_ASSERT( !"FAILURE: Primary key unknown" );
whereClause = QStringLiteral( "NULL" );
break;
}
return whereClause;
}
QString QgsPostgresUtils::whereClause( const QgsFeatureIds &featureIds, const QgsFields &fields, QgsPostgresConn *conn, QgsPostgresPrimaryKeyType pkType, const QList<int> &pkAttrs, const std::shared_ptr<QgsPostgresSharedData> &sharedData )
{
switch ( pkType )
{
case PktOid:
case PktInt:
{
QString expr;
//simple primary key, so prefer to use an "IN (...)" query. These are much faster then multiple chained ...OR... clauses
if ( !featureIds.isEmpty() )
{
QString delim;
expr = QStringLiteral( "%1 IN (" ).arg( ( pkType == PktOid ? QStringLiteral( "oid" ) : QgsPostgresConn::quotedIdentifier( fields.at( pkAttrs[0] ).name() ) ) );
for ( const QgsFeatureId featureId : qgis::as_const( featureIds ) )
{
expr += delim + FID_TO_STRING( ( pkType == PktOid ? featureId : FID2PKINT( featureId ) ) );
delim = ',';
}
expr += ')';
}
return expr;
}
case PktInt64:
case PktUint64:
{
QString expr;
//simple primary key, so prefer to use an "IN (...)" query. These are much faster then multiple chained ...OR... clauses
if ( !featureIds.isEmpty() )
{
QString delim;
expr = QStringLiteral( "%1 IN (" ).arg( QgsPostgresConn::quotedIdentifier( fields.at( pkAttrs[0] ).name() ) );
for ( const QgsFeatureId featureId : qgis::as_const( featureIds ) )
{
QVariantList pkVals = sharedData->lookupKey( featureId );
if ( !pkVals.isEmpty() )
{
QgsField fld = fields.at( pkAttrs[0] );
expr += delim + pkVals[0].toString();
delim = ',';
}
}
expr += ')';
}
return expr;
}
case PktFidMap:
case PktTid:
case PktUnknown:
{
//complex primary key, need to build up where string
QStringList whereClauses;
for ( const QgsFeatureId featureId : qgis::as_const( featureIds ) )
{
whereClauses << whereClause( featureId, fields, conn, pkType, pkAttrs, sharedData );
}
return whereClauses.isEmpty() ? QString() : whereClauses.join( QLatin1String( " OR " ) ).prepend( '(' ).append( ')' );
}
}
return QString(); //avoid warning
}
QString QgsPostgresUtils::andWhereClauses( const QString &c1, const QString &c2 )
{
if ( c1.isEmpty() )
return c2;
if ( c2.isEmpty() )
return c1;
return QStringLiteral( "(%1) AND (%2)" ).arg( c1, c2 );
}
void QgsPostgresUtils::replaceInvalidXmlChars( QString &xml )
{
static const QRegularExpression replaceRe { QStringLiteral( "([\x00-\x08\x0B-\x1F\x7F])" ) };
QRegularExpressionMatchIterator it {replaceRe.globalMatch( xml ) };
while ( it.hasNext() )
{
const QRegularExpressionMatch match { it.next() };
const QChar c { match.captured( 1 ).at( 0 ) };
xml.replace( c, QStringLiteral( "UTF-8[%1]" ).arg( c.unicode() ) );
}
}
void QgsPostgresUtils::restoreInvalidXmlChars( QString &xml )
{
static const QRegularExpression replaceRe { QStringLiteral( R"raw(UTF-8\[(\d+)\])raw" ) };
QRegularExpressionMatchIterator it {replaceRe.globalMatch( xml ) };
while ( it.hasNext() )
{
const QRegularExpressionMatch match { it.next() };
bool ok;
const ushort code { match.captured( 1 ).toUShort( &ok ) };
if ( ok )
{
xml.replace( QStringLiteral( "UTF-8[%1]" ).arg( code ), QChar( code ) );
}
}
}
QString QgsPostgresProvider::filterWhereClause() const
{
QString where;
QString delim = QStringLiteral( " WHERE " );
if ( !mSqlWhereClause.isEmpty() )
{
where += delim + '(' + mSqlWhereClause + ')';
delim = QStringLiteral( " AND " );
}
if ( !mRequestedSrid.isEmpty() && ( mRequestedSrid != mDetectedSrid || mRequestedSrid.toInt() == 0 ) )
{
where += delim + QStringLiteral( "%1(%2%3)=%4" )
.arg( connectionRO()->majorVersion() < 2 ? "srid" : "st_srid",
quotedIdentifier( mGeometryColumn ),
mSpatialColType == SctGeography ? "::geography" : "",
mRequestedSrid );
delim = QStringLiteral( " AND " );
}
if ( mRequestedGeomType != QgsWkbTypes::Unknown && mRequestedGeomType != mDetectedGeomType )
{
where += delim + QgsPostgresConn::postgisTypeFilter( mGeometryColumn, ( QgsWkbTypes::Type )mRequestedGeomType, mSpatialColType == SctGeography );
delim = QStringLiteral( " AND " );
}
return where;
}
void QgsPostgresProvider::setExtent( QgsRectangle &newExtent )
{
mLayerExtent.setXMaximum( newExtent.xMaximum() );
mLayerExtent.setXMinimum( newExtent.xMinimum() );
mLayerExtent.setYMaximum( newExtent.yMaximum() );
mLayerExtent.setYMinimum( newExtent.yMinimum() );
}
/**
* Returns the feature type
*/
QgsWkbTypes::Type QgsPostgresProvider::wkbType() const
{
return mRequestedGeomType != QgsWkbTypes::Unknown ? mRequestedGeomType : mDetectedGeomType;
}
QgsLayerMetadata QgsPostgresProvider::layerMetadata() const
{
return mLayerMetadata;
}
QgsField QgsPostgresProvider::field( int index ) const
{
if ( index < 0 || index >= mAttributeFields.count() )
{
QgsMessageLog::logMessage( tr( "FAILURE: Field %1 not found." ).arg( index ), tr( "PostGIS" ) );
throw PGFieldNotFound();
}
return mAttributeFields.at( index );
}
QgsFields QgsPostgresProvider::fields() const
{
return mAttributeFields;
}
QString QgsPostgresProvider::dataComment() const
{
return mDataComment;
}
//! \todo XXX Perhaps this should be promoted to QgsDataProvider?
QString QgsPostgresProvider::endianString()
{
switch ( QgsApplication::endian() )
{
case QgsApplication::NDR:
return QStringLiteral( "NDR" );
case QgsApplication::XDR:
return QStringLiteral( "XDR" );
default :
return QStringLiteral( "Unknown" );
}
}
struct PGTypeInfo
{
QString typeName;
QString typeType;
QString typeElem;
int typeLen;
};
bool QgsPostgresProvider::loadFields()
{
// Clear cached information about enum values support
mShared->clearSupportsEnumValuesCache();
QString sql;
QString attroidsFilter;
if ( !mIsQuery )
{
QgsDebugMsgLevel( QStringLiteral( "Loading fields for table %1" ).arg( mTableName ), 2 );
// Get the table description
sql = QStringLiteral( "SELECT description FROM pg_description WHERE objoid=regclass(%1)::oid AND objsubid=0" ).arg( quotedValue( mQuery ) );
QgsPostgresResult tresult( connectionRO()->PQexec( sql ) );
if ( tresult.PQntuples() > 0 )
{
mDataComment = tresult.PQgetvalue( 0, 0 );
mLayerMetadata.setAbstract( mDataComment );
}
}
// Populate the field vector for this layer. The field vector contains
// field name, type, length, and precision (if numeric)
sql = QStringLiteral( "SELECT * FROM %1 LIMIT 0" ).arg( mQuery );
QgsPostgresResult result( connectionRO()->PQexec( sql ) );
QMap<Oid, QMap<int, QString> > fmtFieldTypeMap, descrMap, defValMap, identityMap, generatedMap;
QMap<Oid, QMap<int, Oid> > attTypeIdMap;
QMap<Oid, QMap<int, bool> > notNullMap, uniqueMap;
if ( result.PQnfields() > 0 )
{
// Collect attribiute oids
QSet<Oid> attroids;
for ( int i = 0; i < result.PQnfields(); i++ )
{
Oid attroid = result.PQftype( i );
attroids.insert( attroid );
}
// Collect table oids
QSet<Oid> tableoids;
for ( int i = 0; i < result.PQnfields(); i++ )
{
Oid tableoid = result.PQftable( i );
if ( tableoid > 0 )
{
tableoids.insert( tableoid );
}
}
if ( !tableoids.isEmpty() )
{
QStringList tableoidsList;
const auto constTableoids = tableoids;
for ( Oid tableoid : constTableoids )
{
tableoidsList.append( QString::number( tableoid ) );
}
QString tableoidsFilter = '(' + tableoidsList.join( QLatin1Char( ',' ) ) + ')';
// Collect formatted field types
sql = QStringLiteral(
"SELECT attrelid, attnum, pg_catalog.format_type(atttypid,atttypmod), pg_catalog.col_description(attrelid,attnum), pg_catalog.pg_get_expr(adbin,adrelid), atttypid, attnotnull::int, indisunique::int%1%2"
" FROM pg_attribute"
" LEFT OUTER JOIN pg_attrdef ON attrelid=adrelid AND attnum=adnum"
// find unique constraints if present. Text cast required to handle int2vector comparison. Distinct required as multiple unique constraints may exist
" LEFT OUTER JOIN ( SELECT DISTINCT indrelid, indkey, indisunique FROM pg_index WHERE indisunique ) uniq ON attrelid=indrelid AND attnum::text=indkey::text "
" WHERE attrelid IN %3"
).arg( connectionRO()->pgVersion() >= 100000 ? QStringLiteral( ", attidentity" ) : QString(),
connectionRO()->pgVersion() >= 120000 ? QStringLiteral( ", attgenerated" ) : QString(),
tableoidsFilter );
QgsPostgresResult fmtFieldTypeResult( connectionRO()->PQexec( sql ) );
for ( int i = 0; i < fmtFieldTypeResult.PQntuples(); ++i )
{
Oid attrelid = fmtFieldTypeResult.PQgetvalue( i, 0 ).toUInt();
int attnum = fmtFieldTypeResult.PQgetvalue( i, 1 ).toInt(); // Int2
QString formatType = fmtFieldTypeResult.PQgetvalue( i, 2 );
QString descr = fmtFieldTypeResult.PQgetvalue( i, 3 );
QString defVal = fmtFieldTypeResult.PQgetvalue( i, 4 );
Oid attType = fmtFieldTypeResult.PQgetvalue( i, 5 ).toUInt();
bool attNotNull = fmtFieldTypeResult.PQgetvalue( i, 6 ).toInt();
bool uniqueConstraint = fmtFieldTypeResult.PQgetvalue( i, 7 ).toInt();
QString attIdentity = connectionRO()->pgVersion() >= 100000 ? fmtFieldTypeResult.PQgetvalue( i, 8 ) : " ";
// On PostgreSQL 12, the field pg_attribute.attgenerated is always filled with "s" if the field is generated,
// with the possibility of other values in future releases. This indicates "STORED" generated fields.
// The documentation for version 12 indicates that there is a future possibility of supporting virtual
// generated values, which might make possible to have values other than "s" on pg_attribute.attgenerated,
// which should be unimportant for QGIS if the user still won't be able to overwrite the column value.
// See https://www.postgresql.org/docs/12/ddl-generated-columns.html
QString attGenerated = connectionRO()->pgVersion() >= 120000 ? fmtFieldTypeResult.PQgetvalue( i, 9 ) : "";
fmtFieldTypeMap[attrelid][attnum] = formatType;
descrMap[attrelid][attnum] = descr;
defValMap[attrelid][attnum] = defVal;
attTypeIdMap[attrelid][attnum] = attType;
notNullMap[attrelid][attnum] = attNotNull;
uniqueMap[attrelid][attnum] = uniqueConstraint;
identityMap[attrelid][attnum] = attIdentity.isEmpty() ? " " : attIdentity;
generatedMap[attrelid][attnum] = attGenerated.isEmpty() ? QString() : defVal;
// Also include atttype oid from pg_attribute, because PQnfields only returns basic type for for domains
attroids.insert( attType );
}
}
// Prepare filter for fetching pg_type info
if ( !attroids.isEmpty() )
{
QStringList attroidsList;
for ( Oid attroid : qgis::as_const( attroids ) )
{
attroidsList.append( QString::number( attroid ) );
}
attroidsFilter = QStringLiteral( "WHERE oid in (%1)" ).arg( attroidsList.join( ',' ) );
}
}
// Collect type info
sql = QStringLiteral( "SELECT oid,typname,typtype,typelem,typlen FROM pg_type %1" ).arg( attroidsFilter );
QgsPostgresResult typeResult( connectionRO()->PQexec( sql ) );
QMap<Oid, PGTypeInfo> typeMap;
for ( int i = 0; i < typeResult.PQntuples(); ++i )
{
PGTypeInfo typeInfo =
{
/* typeName = */ typeResult.PQgetvalue( i, 1 ),
/* typeType = */ typeResult.PQgetvalue( i, 2 ),
/* typeElem = */ typeResult.PQgetvalue( i, 3 ),
/* typeLen = */ typeResult.PQgetvalue( i, 4 ).toInt()
};
typeMap.insert( typeResult.PQgetvalue( i, 0 ).toUInt(), typeInfo );
}
QSet<QString> fields;
mAttributeFields.clear();
mIdentityFields.clear();
for ( int i = 0; i < result.PQnfields(); i++ )
{
QString fieldName = result.PQfname( i );
if ( fieldName == mGeometryColumn )
continue;
Oid fldtyp = result.PQftype( i );
int fldMod = result.PQfmod( i );
int fieldPrec = 0;
Oid tableoid = result.PQftable( i );
int attnum = result.PQftablecol( i );
Oid atttypid = attTypeIdMap[tableoid][attnum];
const PGTypeInfo &typeInfo = typeMap.value( fldtyp );
QString fieldTypeName = typeInfo.typeName;
QString fieldTType = typeInfo.typeType;
int fieldSize = typeInfo.typeLen;
bool isDomain = ( typeMap.value( atttypid ).typeType == QLatin1String( "d" ) );
QString formattedFieldType = fmtFieldTypeMap[tableoid][attnum];
QString originalFormattedFieldType = formattedFieldType;
if ( isDomain )
{
// get correct formatted field type for domain
sql = QStringLiteral( "SELECT format_type(%1, %2)" ).arg( fldtyp ).arg( fldMod );
QgsPostgresResult fmtFieldModResult( connectionRO()->PQexec( sql ) );
if ( fmtFieldModResult.PQntuples() > 0 )
{
formattedFieldType = fmtFieldModResult.PQgetvalue( 0, 0 );
}
}
QString fieldComment = descrMap[tableoid][attnum];
QVariant::Type fieldType = QVariant::Invalid;
QVariant::Type fieldSubType = QVariant::Invalid;
if ( fieldTType == QLatin1String( "b" ) )
{
bool isArray = fieldTypeName.startsWith( '_' );
if ( isArray )
fieldTypeName = fieldTypeName.mid( 1 );
if ( fieldTypeName == QLatin1String( "int8" ) || fieldTypeName == QLatin1String( "serial8" ) )
{
fieldType = QVariant::LongLong;
fieldSize = -1;
fieldPrec = 0;
}
else if ( fieldTypeName == QLatin1String( "int2" ) || fieldTypeName == QLatin1String( "int4" ) ||
fieldTypeName == QLatin1String( "oid" ) || fieldTypeName == QLatin1String( "serial" ) )
{
fieldType = QVariant::Int;
fieldSize = -1;
fieldPrec = 0;
}
else if ( fieldTypeName == QLatin1String( "real" ) || fieldTypeName == QLatin1String( "double precision" ) ||
fieldTypeName == QLatin1String( "float4" ) || fieldTypeName == QLatin1String( "float8" ) )
{
fieldType = QVariant::Double;
fieldSize = -1;
fieldPrec = 0;
}
else if ( fieldTypeName == QLatin1String( "numeric" ) )
{
fieldType = QVariant::Double;