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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 <QMessageBox>
#include "qgsvectorlayerimport.h"
#include "qgsprovidercountcalcevent.h"
#include "qgsproviderextentcalcevent.h"
#include "qgspostgresprovider.h"
#include "qgspostgresconn.h"
#include "qgspostgresconnpool.h"
#include "qgspgsourceselect.h"
#include "qgspostgresdataitems.h"
#include "qgspostgresfeatureiterator.h"
#include "qgspostgrestransaction.h"
#include "qgslogger.h"
const QString POSTGRES_KEY = "postgres";
const QString POSTGRES_DESCRIPTION = "PostgreSQL/PostGIS data provider";
QgsPostgresProvider::QgsPostgresProvider( QString const & uri )
: QgsVectorDataProvider( uri )
, mValid( false )
, mPrimaryKeyType( pktUnknown )
, mSpatialColType( sctNone )
, mDetectedGeomType( QGis::WKBUnknown )
, mForce2d( false )
, mRequestedGeomType( QGis::WKBUnknown )
, mShared( new QgsPostgresSharedData )
, mUseEstimatedMetadata( false )
, mSelectAtIdDisabled( false )
, mEnabledCapabilities( 0 )
, mConnectionRO( 0 )
, mConnectionRW( 0 )
, mTransaction( 0 )
{
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();
// 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( "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, -1, -1, 0, 0 )
<< QgsVectorDataProvider::NativeType( tr( "Whole number (integer - 32bit)" ), "int4", QVariant::Int, -1, -1, 0, 0 )
<< QgsVectorDataProvider::NativeType( tr( "Whole number (integer - 64bit)" ), "int8", QVariant::LongLong, -1, -1, 0, 0 )
<< 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, -1, -1, -1, -1 )
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (double)" ), "double precision", QVariant::Double, -1, -1, -1, -1 )
// string types
<< QgsVectorDataProvider::NativeType( tr( "Text, fixed length (char)" ), "char", QVariant::String, 1, 255, -1, -1 )
<< QgsVectorDataProvider::NativeType( tr( "Text, limited variable length (varchar)" ), "varchar", QVariant::String, 1, 255, -1, -1 )
<< QgsVectorDataProvider::NativeType( tr( "Text, unlimited length (text)" ), "text", QVariant::String, -1, -1, -1, -1 )
// date type
<< QgsVectorDataProvider::NativeType( tr( "Date" ), "date", QVariant::Date, -1, -1, -1, -1 )
;
QString key;
switch ( mPrimaryKeyType )
{
case pktOid:
key = "oid";
break;
case pktTid:
key = "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 pktFidMap:
{
QString delim;
Q_FOREACH ( int idx, mPrimaryKeyAttrs )
{
key += delim + quotedIdentifier( 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();
}
}
QgsPostgresProvider::~QgsPostgresProvider()
{
disconnectDb();
QgsDebugMsg( "deconstructing." );
}
QgsAbstractFeatureSource* QgsPostgresProvider::featureSource() const
{
return new QgsPostgresFeatureSource( this );
}
QgsPostgresConn* QgsPostgresProvider::connectionRO() const
{
return mTransaction ? mTransaction->connection() : mConnectionRO;
}
QgsPostgresConn* QgsPostgresProvider::connectionRW()
{
if ( mTransaction )
{
return mTransaction->connection();
}
else if ( !mConnectionRW )
{
mConnectionRW = QgsPostgresConn::connectDb( mUri.connectionInfo(), false );
}
return mConnectionRW;
}
QgsTransaction* QgsPostgresProvider::transaction() const
{
return static_cast<QgsTransaction*>( mTransaction );
}
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 = 0;
}
if ( mConnectionRW )
{
mConnectionRW->unref();
mConnectionRW = 0;
}
}
QString QgsPostgresProvider::storageType() const
{
return "PostgreSQL database with PostGIS extension";
}
// Qt5 has that built in
#if QT_VERSION < 0x050000
static bool operator<( const QVariant &a, const QVariant &b )
{
// invalid < NULL < any value
if ( !a.isValid() )
return b.isValid();
else if ( a.isNull() )
return b.isValid() && !b.isNull();
else if ( !b.isValid() || 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:
{
const QList<QVariant> &al = a.toList();
const QList<QVariant> &bl = b.toList();
int i, n = qMin( al.size(), bl.size() );
for ( i = 0; i < n && al[i].type() == bl[i].type() && al[i].isNull() == bl[i].isNull() && al[i] == bl[i]; i++ )
;
if ( i == n )
return al.size() < bl.size();
else
return al[i] < bl[i];
}
break;
case QVariant::StringList:
{
const QStringList &al = a.toStringList();
const 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();
}
#endif
QgsFeatureIterator QgsPostgresProvider::getFeatures( const QgsFeatureRequest& request )
{
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, false, request ) );
}
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( connectionRO()->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:
{
QVariant pkValsVariant = mShared->lookupKey( featureId );
QList<QVariant> pkVals;
if ( !pkValsVariant.isNull() )
{
pkVals = pkValsVariant.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
{
return QgsPostgresUtils::whereClause( featureId, mAttributeFields, connectionRO(), mPrimaryKeyType, mPrimaryKeyAttrs, mShared );
}
QString QgsPostgresUtils::whereClause( QgsFeatureId featureId, const QgsFields& fields, QgsPostgresConn* conn, QgsPostgresPrimaryKeyType pkType, const QList<int>& pkAttrs, QSharedPointer<QgsPostgresSharedData> sharedData )
{
QString whereClause;
switch ( pkType )
{
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( pkAttrs.size() == 1 );
whereClause = QString( "%1=%2" ).arg( QgsPostgresConn::quotedIdentifier( fields[ pkAttrs[0] ].name() ) ).arg( featureId );
break;
case pktFidMap:
{
QVariant pkValsVariant = sharedData->lookupKey( featureId );
if ( !pkValsVariant.isNull() )
{
QList<QVariant> pkVals = pkValsVariant.toList();
Q_ASSERT( pkVals.size() == pkAttrs.size() );
QString delim = "";
for ( int i = 0; i < pkAttrs.size(); i++ )
{
int idx = pkAttrs[i];
const QgsField &fld = fields[ idx ];
whereClause += delim + conn->fieldExpression( fld );
if ( pkVals[i].isNull() )
whereClause += " IS NULL";
else
whereClause += '=' + QgsPostgresConn::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;
}
return whereClause;
}
QString QgsPostgresUtils::whereClause( const QgsFeatureIds& featureIds, const QgsFields& fields, QgsPostgresConn* conn, QgsPostgresPrimaryKeyType pkType, const QList<int>& pkAttrs, QSharedPointer<QgsPostgresSharedData> sharedData )
{
switch ( pkType )
{
case pktOid:
case pktInt:
{
//simple primary key, so prefer to use an "IN (...)" query. These are much faster then multiple chained ...OR... clauses
QString delim;
QString expr = QString( "%1 IN (" ).arg(( pkType == pktOid ? "oid" : QgsPostgresConn::quotedIdentifier( fields[ pkAttrs[0] ].name() ) ) );
Q_FOREACH ( const QgsFeatureId featureId, featureIds )
{
expr += delim + QString::number( featureId );
delim = ',';
}
expr += ')';
return expr;
}
default:
{
//complex primary key, need to build up where string
QStringList whereClauses;
Q_FOREACH ( const QgsFeatureId featureId, featureIds )
{
whereClauses << whereClause( featureId, fields, conn, pkType, pkAttrs, sharedData );
}
return whereClauses.isEmpty() ? "" : whereClauses.join( " OR " ).prepend( '(' ).append( ')' );
}
}
}
QString QgsPostgresUtils::andWhereClauses( const QString& c1, const QString& c2 )
{
if ( c1.isEmpty() )
return c2;
if ( c2.isEmpty() )
return c1;
return QString( "(%1) AND (%2)" ).arg( c1, c2 );
}
QString QgsPostgresProvider::filterWhereClause() const
{
QString where;
QString delim = " WHERE ";
if ( !mSqlWhereClause.isEmpty() )
{
where += delim + '(' + mSqlWhereClause + ')';
delim = " AND ";
}
if ( !mRequestedSrid.isEmpty() && ( mRequestedSrid != mDetectedSrid || mRequestedSrid.toInt() == 0 ) )
{
where += delim + QString( "%1(%2%3)=%4" )
.arg( connectionRO()->majorVersion() < 2 ? "srid" : "st_srid",
quotedIdentifier( mGeometryColumn ),
mSpatialColType == sctGeography ? "::geography" : "",
mRequestedSrid );
delim = " AND ";
}
if ( mRequestedGeomType != QGis::WKBUnknown && mRequestedGeomType != mDetectedGeomType )
{
where += delim + QgsPostgresConn::postgisTypeFilter( mGeometryColumn, ( QgsWKBTypes::Type )mRequestedGeomType, mSpatialColType == sctGeography );
delim = " AND ";
}
return where;
}
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
{
if ( index < 0 || index >= mAttributeFields.count() )
{
QgsMessageLog::logMessage( tr( "FAILURE: Field %1 not found." ).arg( index ), tr( "PostGIS" ) );
throw PGFieldNotFound();
}
return mAttributeFields[index];
}
const 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 QString( "NDR" );
break;
case QgsApplication::XDR:
return QString( "XDR" );
break;
default :
return QString( "Unknown" );
}
}
struct PGTypeInfo
{
QString typeName;
QString typeType;
QString typeElem;
int typeLen;
};
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( connectionRO()->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 = connectionRO()->PQexec( sql );
if ( tresult.PQntuples() > 0 )
mDataComment = tresult.PQgetvalue( 0, 0 );
}
// Populate the field vector for this layer. The field vector contains
// field name, type, length, and precision (if numeric)
QString sql = QString( "SELECT * FROM %1 LIMIT 0" ).arg( mQuery );
QgsPostgresResult result( connectionRO()->PQexec( sql ) );
// Collect type info
sql = "SELECT oid,typname,typtype,typelem,typlen FROM pg_type";
QgsPostgresResult typeResult( connectionRO()->PQexec( sql ) );
QMap<int, 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 ).toInt(), typeInfo );
}
QMap<int, QMap<int, QString> > fmtFieldTypeMap, descrMap, defValMap;
if ( result.PQnfields() > 0 )
{
// Collect table oids
QSet<int> tableoids;
for ( int i = 0; i < result.PQnfields(); i++ )
{
int tableoid = result.PQftable( i );
if ( tableoid > 0 )
{
tableoids.insert( tableoid );
}
}
if ( !tableoids.isEmpty() )
{
QStringList tableoidsList;
Q_FOREACH ( int tableoid, tableoids )
{
tableoidsList.append( QString::number( tableoid ) );
}
QString tableoidsFilter = '(' + tableoidsList.join( "," ) + ')';
// Collect formatted field types
sql = "SELECT attrelid, attnum, pg_catalog.format_type(atttypid,atttypmod), pg_catalog.col_description(attrelid,attnum), pg_catalog.pg_get_expr(adbin,adrelid)"
" FROM pg_attribute"
" LEFT OUTER JOIN pg_attrdef ON attrelid=adrelid AND attnum=adnum"
" WHERE attrelid IN " + tableoidsFilter;
QgsPostgresResult fmtFieldTypeResult( connectionRO()->PQexec( sql ) );
for ( int i = 0; i < fmtFieldTypeResult.PQntuples(); ++i )
{
int attrelid = fmtFieldTypeResult.PQgetvalue( i, 0 ).toInt();
int attnum = fmtFieldTypeResult.PQgetvalue( i, 1 ).toInt();
QString formatType = fmtFieldTypeResult.PQgetvalue( i, 2 );
QString descr = fmtFieldTypeResult.PQgetvalue( i, 3 );
QString defVal = fmtFieldTypeResult.PQgetvalue( i, 4 );
fmtFieldTypeMap[attrelid][attnum] = formatType;
descrMap[attrelid][attnum] = descr;
defValMap[attrelid][attnum] = defVal;
}
}
}
QSet<QString> fields;
mAttributeFields.clear();
for ( int i = 0; i < result.PQnfields(); i++ )
{
QString fieldName = result.PQfname( i );
if ( fieldName == mGeometryColumn )
continue;
int fldtyp = result.PQftype( i );
int fieldPrec = -1;
int tableoid = result.PQftable( i );
int attnum = result.PQftablecol( i );
const PGTypeInfo& typeInfo = typeMap.value( fldtyp );
QString fieldTypeName = typeInfo.typeName;
QString fieldTType = typeInfo.typeType;
int fieldSize = typeInfo.typeLen;
QString formattedFieldType = fmtFieldTypeMap[tableoid][attnum];
QString fieldComment = descrMap[tableoid][attnum];
QVariant::Type fieldType;
if ( fieldTType == "b" )
{
bool isArray = fieldTypeName.startsWith( '_' );
if ( isArray )
fieldTypeName = fieldTypeName.mid( 1 );
if ( fieldTypeName == "int8" || fieldTypeName == "serial8" )
{
fieldType = QVariant::LongLong;
fieldSize = -1;
fieldPrec = 0;
}
else if ( fieldTypeName == "int2" || fieldTypeName == "int4" ||
fieldTypeName == "oid" || fieldTypeName == "serial" )
{
fieldType = QVariant::Int;
fieldSize = -1;
fieldPrec = 0;
}
else if ( fieldTypeName == "real" || fieldTypeName == "double precision" ||
fieldTypeName == "float4" || fieldTypeName == "float8" )
{
fieldType = QVariant::Double;
fieldSize = -1;
fieldPrec = -1;
}
else if ( fieldTypeName == "numeric" )
{
fieldType = QVariant::Double;
if ( formattedFieldType == "numeric" || formattedFieldType == "" )
{
fieldSize = -1;
fieldPrec = -1;
}
else
{
QRegExp re( "numeric\\((\\d+),(\\d+)\\)" );
if ( re.exactMatch( formattedFieldType ) )
{
fieldSize = re.cap( 1 ).toInt();
fieldPrec = re.cap( 2 ).toInt();
}
else if ( formattedFieldType != "numeric" )
{
QgsMessageLog::logMessage( tr( "unexpected formatted field type '%1' for field %2" )
.arg( formattedFieldType,
fieldName ),
tr( "PostGIS" ) );
fieldSize = -1;
fieldPrec = -1;
}
}
}
else if ( fieldTypeName == "varchar" )
{
fieldType = QVariant::String;
QRegExp re( "character varying\\((\\d+)\\)" );
if ( re.exactMatch( formattedFieldType ) )
{
fieldSize = re.cap( 1 ).toInt();
}
else
{
fieldSize = -1;
}
}
else if ( fieldTypeName == "date" )
{
fieldType = QVariant::Date;
fieldSize = -1;
}
else if ( fieldTypeName == "text" ||
fieldTypeName == "bool" ||
fieldTypeName == "geometry" ||
fieldTypeName == "hstore" ||
fieldTypeName == "inet" ||
fieldTypeName == "money" ||
fieldTypeName == "ltree" ||
fieldTypeName == "uuid" ||
fieldTypeName == "xml" ||
fieldTypeName.startsWith( "time" ) ||
fieldTypeName.startsWith( "date" ) )
{
fieldType = QVariant::String;
fieldSize = -1;
}
else if ( fieldTypeName == "bpchar" )
{
fieldType = QVariant::String;
QRegExp re( "character\\((\\d+)\\)" );
if ( re.exactMatch( formattedFieldType ) )
{
fieldSize = re.cap( 1 ).toInt();
}
else
{
QgsDebugMsg( QString( "unexpected formatted field type '%1' for field %2" )
.arg( formattedFieldType,
fieldName ) );
fieldSize = -1;
fieldPrec = -1;
}
}
else if ( fieldTypeName == "char" )
{
fieldType = QVariant::String;
QRegExp re( "char\\((\\d+)\\)" );
if ( re.exactMatch( formattedFieldType ) )
{
fieldSize = re.cap( 1 ).toInt();
}
else
{
QgsMessageLog::logMessage( tr( "unexpected formatted field type '%1' for field %2" )
.arg( formattedFieldType,
fieldName ) );
fieldSize = -1;
fieldPrec = -1;
}
}
else
{
QgsMessageLog::logMessage( tr( "Field %1 ignored, because of unsupported type %2" ).arg( fieldName, fieldTypeName ), tr( "PostGIS" ) );
continue;
}
if ( isArray )
{
fieldTypeName = '_' + fieldTypeName;
fieldType = QVariant::String;
fieldSize = -1;
}
}
else if ( fieldTType == "e" )
{
// enum
fieldType = QVariant::String;
fieldSize = -1;
}
else
{
QgsMessageLog::logMessage( tr( "Field %1 ignored, because of unsupported type %2" ).arg( fieldName, fieldTType ), tr( "PostGIS" ) );
continue;
}
if ( fields.contains( fieldName ) )
{
QgsMessageLog::logMessage( tr( "Duplicate field %1 found\n" ).arg( fieldName ), tr( "PostGIS" ) );
return false;
}
fields << fieldName;
mAttrPalIndexName.insert( i, fieldName );
mDefaultValues.insert( mAttributeFields.size(), defValMap[tableoid][attnum] );
mAttributeFields.append( QgsField( fieldName, fieldType, fieldTypeName, fieldSize, fieldPrec, fieldComment ) );
}
return true;
}
bool QgsPostgresProvider::hasSufficientPermsAndCapabilities()
{
QgsDebugMsg( "Checking for permissions on the relation" );
QgsPostgresResult testAccess;
if ( !mIsQuery )
{
// Check that we can read from the table (i.e., we have select permission).
QString sql = QString( "SELECT * FROM %1 LIMIT 1" ).arg( mQuery );
QgsPostgresResult testAccess( connectionRO()->PQexec( sql ) );
if ( testAccess.PQresultStatus() != PGRES_TUPLES_OK )
{
QgsMessageLog::logMessage( tr( "Unable to access the %1 relation.\nThe error message from the database was:\n%2.\nSQL: %3" )
.arg( mQuery,
testAccess.PQresultErrorMessage(),
sql ), tr( "PostGIS" ) );
return false;
}
bool inRecovery = false;
if ( connectionRO()->pgVersion() >= 90000 )
{
testAccess = connectionRO()->PQexec( "SELECT pg_is_in_recovery()" );
if ( testAccess.PQresultStatus() != PGRES_TUPLES_OK || testAccess.PQgetvalue( 0, 0 ) == "t" )
{
QgsMessageLog::logMessage( tr( "PostgreSQL is still in recovery after a database crash\n(or you are connected to a (read-only) slave).\nWrite accesses will be denied." ), tr( "PostGIS" ) );
inRecovery = true;
}
}
// postgres has fast access to features at id (thanks to primary key / unique index)
// the latter flag is here just for compatibility
if ( !mSelectAtIdDisabled )
{
mEnabledCapabilities = QgsVectorDataProvider::SelectAtId | QgsVectorDataProvider::SelectGeometryAtId;
}
if ( !inRecovery )
{