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qgspostgresprovider.cpp
3217 lines (2723 loc) · 96.1 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 <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 "qgspostgresfeatureiterator.h"
#include "qgslogger.h"
const QString POSTGRES_KEY = "postgres";
const QString POSTGRES_DESCRIPTION = "PostgreSQL/PostGIS data provider";
int QgsPostgresProvider::sProviderIds = 0;
QgsPostgresProvider::QgsPostgresProvider( QString const & uri )
: QgsVectorDataProvider( uri )
, mValid( false )
, mPrimaryKeyType( pktUnknown )
, mSpatialColType( sctNone )
, mDetectedGeomType( QGis::WKBUnknown )
, mRequestedGeomType( QGis::WKBUnknown )
, mUseEstimatedMetadata( false )
, mSelectAtIdDisabled( false )
, mConnectionRO( 0 )
, mConnectionRW( 0 )
, mFidCounter( 0 )
, mActiveIterator( 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( mPrimaryKeyAttrs[0] >= 0 && mPrimaryKeyAttrs[0] < mAttributeFields.count() );
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()
{
if ( mActiveIterator )
mActiveIterator->close();
disconnectDb();
QgsDebugMsg( "deconstructing." );
}
void QgsPostgresProvider::disconnectDb()
{
if ( mConnectionRO )
{
mConnectionRO->disconnect();
mConnectionRO = 0;
}
if ( mConnectionRW )
{
mConnectionRW->disconnect();
mConnectionRW = 0;
}
}
QString QgsPostgresProvider::storageType() const
{
return "PostgreSQL database with PostGIS extension";
}
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;
}
QgsFeatureIterator QgsPostgresProvider::getFeatures( const QgsFeatureRequest& request )
{
if ( !mValid )
{
QgsMessageLog::logMessage( tr( "Read attempt on an invalid postgresql data source" ), tr( "PostGIS" ) );
return QgsFeatureIterator();
}
return QgsFeatureIterator( new QgsPostgresFeatureIterator( this, 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( 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;
}
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" );
}
}
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 )
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 = mConnectionRO->PQexec( sql );
QSet<QString> fields;
// The queries inside this loop could possibly be combined into one
// single query - this would make the code run faster.
mAttributeFields.clear();
for ( int i = 0; i < result.PQnfields(); i++ )
{
QString fieldName = result.PQfname( i );
if ( fieldName == mGeometryColumn )
continue;
int fldtyp = result.PQftype( i );
QString typOid = QString().setNum( fldtyp );
int fieldPrec = -1;
QString fieldComment( "" );
int tableoid = result.PQftable( i );
sql = QString( "SELECT typname,typtype,typelem,typlen FROM pg_type WHERE oid=%1" ).arg( typOid );
// just oid; needs more work to support array type
// "oid = (SELECT Distinct typelem FROM pg_type WHERE " //needs DISTINCT to guard against 2 or more rows on int2
// "typelem = " + typOid + " AND typlen = -1)";
QgsPostgresResult oidResult = mConnectionRO->PQexec( sql );
QString fieldTypeName = oidResult.PQgetvalue( 0, 0 );
QString fieldTType = oidResult.PQgetvalue( 0, 1 );
QString fieldElem = oidResult.PQgetvalue( 0, 2 );
int fieldSize = oidResult.PQgetvalue( 0, 3 ).toInt();
QString formattedFieldType;
if ( tableoid > 0 )
{
sql = QString( "SELECT attnum,pg_catalog.format_type(atttypid,atttypmod) FROM pg_attribute WHERE attrelid=%1 AND attname=%2" )
.arg( tableoid ).arg( quotedValue( fieldName ) );
QgsPostgresResult tresult = mConnectionRO->PQexec( sql );
QString attnum = tresult.PQgetvalue( 0, 0 );
formattedFieldType = tresult.PQgetvalue( 0, 1 );
if ( !attnum.isEmpty() )
{
sql = QString( "SELECT description FROM pg_description WHERE objoid=%1 AND objsubid=%2" )
.arg( tableoid ).arg( attnum );
tresult = mConnectionRO->PQexec( sql );
if ( tresult.PQntuples() > 0 )
fieldComment = tresult.PQgetvalue( 0, 0 );
}
}
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" )
{
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 )
.arg( 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 == "text" ||
fieldTypeName == "bpchar" ||
fieldTypeName == "bool" ||
fieldTypeName == "geometry" ||
fieldTypeName == "money" ||
fieldTypeName == "ltree" ||
fieldTypeName == "uuid" ||
fieldTypeName.startsWith( "time" ) ||
fieldTypeName.startsWith( "date" ) )
{
fieldType = QVariant::String;
fieldSize = -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 )
.arg( fieldName ) );
fieldSize = -1;
fieldPrec = -1;
}
}
else
{
QgsMessageLog::logMessage( tr( "Field %1 ignored, because of unsupported type %2" ).arg( fieldName ).arg( 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 type %2" ).arg( fieldName ).arg( 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 );
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 = mConnectionRO->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 )
.arg( testAccess.PQresultErrorMessage() )
.arg( sql ), tr( "PostGIS" ) );
return false;
}
bool inRecovery = false;
if ( mConnectionRO->pgVersion() >= 90000 )
{
testAccess = mConnectionRO->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 )
{
if ( mConnectionRO->pgVersion() >= 80400 )
{
sql = QString( "SELECT "
"has_table_privilege(%1,'DELETE'),"
"has_any_column_privilege(%1,'UPDATE'),"
"%2"
"has_table_privilege(%1,'INSERT'),"
"current_schema()" )
.arg( quotedValue( mQuery ) )
.arg( mGeometryColumn.isNull()
? QString( "'f'," )
: QString( "has_column_privilege(%1,%2,'UPDATE')," )
.arg( quotedValue( mQuery ) )
.arg( quotedValue( mGeometryColumn ) )
);
}
else
{
sql = QString( "SELECT "
"has_table_privilege(%1,'DELETE'),"
"has_table_privilege(%1,'UPDATE'),"
"has_table_privilege(%1,'UPDATE'),"
"has_table_privilege(%1,'INSERT'),"
"current_schema()" )
.arg( quotedValue( mQuery ) );
}
testAccess = mConnectionRO->PQexec( sql );
if ( testAccess.PQresultStatus() != PGRES_TUPLES_OK )
{
QgsMessageLog::logMessage( tr( "Unable to determine table access privileges for the %1 relation.\nThe error message from the database was:\n%2.\nSQL: %3" )
.arg( mQuery )
.arg( testAccess.PQresultErrorMessage() )
.arg( sql ),
tr( "PostGIS" ) );
return false;
}
if ( testAccess.PQgetvalue( 0, 0 ) == "t" )
{
// DELETE
mEnabledCapabilities |= QgsVectorDataProvider::DeleteFeatures;
}
if ( testAccess.PQgetvalue( 0, 1 ) == "t" )
{
// UPDATE
mEnabledCapabilities |= QgsVectorDataProvider::ChangeAttributeValues;
}
if ( testAccess.PQgetvalue( 0, 2 ) == "t" )
{
// UPDATE
mEnabledCapabilities |= QgsVectorDataProvider::ChangeGeometries;
}
if ( testAccess.PQgetvalue( 0, 3 ) == "t" )
{
// INSERT
mEnabledCapabilities |= QgsVectorDataProvider::AddFeatures;
}
if ( mSchemaName.isEmpty() )
mSchemaName = testAccess.PQgetvalue( 0, 4 );
sql = QString( "SELECT 1 FROM pg_class,pg_namespace WHERE "
"pg_class.relnamespace=pg_namespace.oid AND "
"pg_get_userbyid(relowner)=current_user AND "
"relname=%1 AND nspname=%2" )
.arg( quotedValue( mTableName ) )
.arg( quotedValue( mSchemaName ) );
testAccess = mConnectionRO->PQexec( sql );
if ( testAccess.PQresultStatus() == PGRES_TUPLES_OK && testAccess.PQntuples() == 1 )
{
mEnabledCapabilities |= QgsVectorDataProvider::AddAttributes | QgsVectorDataProvider::DeleteAttributes;
}
}
}
else
{
// Check if the sql is a select query
if ( !mQuery.startsWith( "(" ) && !mQuery.endsWith( ")" ) )
{
QgsMessageLog::logMessage( tr( "The custom query is not a select query." ), tr( "PostGIS" ) );
return false;
}
// get a new alias for the subquery
int index = 0;
QString alias;
QRegExp regex;
do
{
alias = QString( "subQuery_%1" ).arg( QString::number( index++ ) );
QString pattern = QString( "(\\\"?)%1\\1" ).arg( QRegExp::escape( alias ) );
regex.setPattern( pattern );
regex.setCaseSensitivity( Qt::CaseInsensitive );
}
while ( mQuery.contains( regex ) );
// convert the custom query into a subquery
mQuery = QString( "%1 AS %2" )
.arg( mQuery )
.arg( quotedIdentifier( alias ) );
QString sql = QString( "SELECT * FROM %1 LIMIT 1" ).arg( mQuery );
testAccess = mConnectionRO->PQexec( sql );
if ( testAccess.PQresultStatus() != PGRES_TUPLES_OK )
{
QgsMessageLog::logMessage( tr( "Unable to execute the query.\nThe error message from the database was:\n%1.\nSQL: %2" )
.arg( testAccess.PQresultErrorMessage() )
.arg( sql ), tr( "PostGIS" ) );
return false;
}
if ( !mSelectAtIdDisabled )
{
mEnabledCapabilities = QgsVectorDataProvider::SelectAtId | QgsVectorDataProvider::SelectGeometryAtId;
}
}
return true;
}
bool QgsPostgresProvider::determinePrimaryKey()
{
if ( !loadFields() )
{
return false;
}
// check to see if there is an unique index on the relation, which
// can be used as a key into the table. Primary keys are always
// unique indices, so we catch them as well.
QString sql;
if ( !mIsQuery )
{
sql = QString( "SELECT indexrelid FROM pg_index WHERE indrelid=%1::regclass AND (indisprimary OR indisunique) ORDER BY CASE WHEN indisprimary THEN 1 ELSE 2 END LIMIT 1" ).arg( quotedValue( mQuery ) );
QgsDebugMsg( QString( "Retrieving first primary or unique index: %1" ).arg( sql ) );
QgsPostgresResult res = mConnectionRO->PQexec( sql );
QgsDebugMsg( QString( "Got %1 rows." ).arg( res.PQntuples() ) );
QStringList log;
// no primary or unique indizes found
if ( res.PQntuples() == 0 )
{
QgsDebugMsg( "Relation has no primary key -- investigating alternatives" );
// Two options here. If the relation is a table, see if there is
// an oid column that can be used instead.
// If the relation is a view try to find a suitable column to use as
// the primary key.
sql = QString( "SELECT relkind FROM pg_class WHERE oid=regclass(%1)::oid" ).arg( quotedValue( mQuery ) );
res = mConnectionRO->PQexec( sql );
QString type = res.PQgetvalue( 0, 0 );
if ( type == "r" ) // the relation is a table
{
QgsDebugMsg( "Relation is a table. Checking to see if it has an oid column." );
mPrimaryKeyAttrs.clear();
// If there is an oid on the table, use that instead,
sql = QString( "SELECT attname FROM pg_attribute WHERE attname='oid' AND attrelid=regclass(%1)" ).arg( quotedValue( mQuery ) );
res = mConnectionRO->PQexec( sql );
if ( res.PQntuples() == 1 )
{
// Could warn the user here that performance will suffer if
// oid isn't indexed (and that they may want to add a
// primary key to the table)
mPrimaryKeyType = pktOid;
}