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qgspostgresconn.cpp
1913 lines (1628 loc) · 58.8 KB
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qgspostgresconn.cpp
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/***************************************************************************
qgspostgresconn.cpp - connection class to PostgreSQL/PostGIS
-------------------
begin : 2011/01/28
copyright : (C) 2011 by Juergen E. Fischer
email : jef at norbit dot de
***************************************************************************/
/***************************************************************************
* *
* 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 "qgspostgresconn.h"
#include "qgsauthmanager.h"
#include "qgslogger.h"
#include "qgsdatasourceuri.h"
#include "qgsmessagelog.h"
#include "qgscredentials.h"
#include "qgsfields.h"
#include "qgspgtablemodel.h"
#include "qgsproviderregistry.h"
#include "qgsvectordataprovider.h"
#include "qgswkbtypes.h"
#include "qgssettings.h"
#include <QApplication>
#include <QThread>
#include <climits>
// for htonl
#ifdef Q_OS_WIN
#include <winsock.h>
#else
#include <netinet/in.h>
#endif
const int PG_DEFAULT_TIMEOUT = 30;
QgsPostgresResult::~QgsPostgresResult()
{
if ( mRes )
::PQclear( mRes );
mRes = nullptr;
}
QgsPostgresResult &QgsPostgresResult::operator=( PGresult *result )
{
if ( mRes )
::PQclear( mRes );
mRes = result;
return *this;
}
QgsPostgresResult &QgsPostgresResult::operator=( const QgsPostgresResult &src )
{
if ( mRes )
::PQclear( mRes );
mRes = src.result();
return *this;
}
ExecStatusType QgsPostgresResult::PQresultStatus()
{
return mRes ? ::PQresultStatus( mRes ) : PGRES_FATAL_ERROR;
}
QString QgsPostgresResult::PQresultErrorMessage()
{
return mRes ? QString::fromUtf8( ::PQresultErrorMessage( mRes ) ) : QObject::tr( "no result buffer" );
}
int QgsPostgresResult::PQntuples()
{
Q_ASSERT( mRes );
return ::PQntuples( mRes );
}
QString QgsPostgresResult::PQgetvalue( int row, int col )
{
Q_ASSERT( mRes );
return PQgetisnull( row, col )
? QString()
: QString::fromUtf8( ::PQgetvalue( mRes, row, col ) );
}
bool QgsPostgresResult::PQgetisnull( int row, int col )
{
Q_ASSERT( mRes );
return ::PQgetisnull( mRes, row, col );
}
int QgsPostgresResult::PQnfields()
{
Q_ASSERT( mRes );
return ::PQnfields( mRes );
}
QString QgsPostgresResult::PQfname( int col )
{
Q_ASSERT( mRes );
return QString::fromUtf8( ::PQfname( mRes, col ) );
}
int QgsPostgresResult::PQftable( int col )
{
Q_ASSERT( mRes );
return ::PQftable( mRes, col );
}
int QgsPostgresResult::PQftablecol( int col )
{
Q_ASSERT( mRes );
return ::PQftablecol( mRes, col );
}
int QgsPostgresResult::PQftype( int col )
{
Q_ASSERT( mRes );
return ::PQftype( mRes, col );
}
int QgsPostgresResult::PQfmod( int col )
{
Q_ASSERT( mRes );
return ::PQfmod( mRes, col );
}
Oid QgsPostgresResult::PQoidValue()
{
Q_ASSERT( mRes );
return ::PQoidValue( mRes );
}
QMap<QString, QgsPostgresConn *> QgsPostgresConn::sConnectionsRO;
QMap<QString, QgsPostgresConn *> QgsPostgresConn::sConnectionsRW;
const int QgsPostgresConn::GEOM_TYPE_SELECT_LIMIT = 100;
QgsPostgresConn *QgsPostgresConn::connectDb( const QString &conninfo, bool readonly, bool shared, bool transaction )
{
QMap<QString, QgsPostgresConn *> &connections =
readonly ? QgsPostgresConn::sConnectionsRO : QgsPostgresConn::sConnectionsRW;
// This is called from may places where shared parameter cannot be forced to false (QgsVectorLayerExporter)
// and which is run in a different thread (drag and drop in browser)
if ( QApplication::instance()->thread() != QThread::currentThread() )
{
shared = false;
}
if ( shared )
{
// sharing connection between threads is not safe
// See https://issues.qgis.org/issues/13141
Q_ASSERT( QApplication::instance()->thread() == QThread::currentThread() );
if ( connections.contains( conninfo ) )
{
QgsDebugMsg( QStringLiteral( "Using cached connection for %1" ).arg( conninfo ) );
connections[conninfo]->mRef++;
return connections[conninfo];
}
}
QgsPostgresConn *conn = new QgsPostgresConn( conninfo, readonly, shared, transaction );
if ( conn->mRef == 0 )
{
delete conn;
return nullptr;
}
if ( shared )
{
connections.insert( conninfo, conn );
}
return conn;
}
static void noticeProcessor( void *arg, const char *message )
{
Q_UNUSED( arg );
QString msg( QString::fromUtf8( message ) );
msg.chop( 1 );
QgsMessageLog::logMessage( QObject::tr( "NOTICE: %1" ).arg( msg ), QObject::tr( "PostGIS" ) );
}
QgsPostgresConn::QgsPostgresConn( const QString &conninfo, bool readOnly, bool shared, bool transaction )
: mRef( 1 )
, mOpenCursors( 0 )
, mConnInfo( conninfo )
, mGeosAvailable( false )
, mTopologyAvailable( false )
, mGotPostgisVersion( false )
, mPostgresqlVersion( 0 )
, mPostgisVersionMajor( 0 )
, mPostgisVersionMinor( 0 )
, mGistAvailable( false )
, mProjAvailable( false )
, mPointcloudAvailable( false )
, mUseWkbHex( false )
, mReadOnly( readOnly )
, mSwapEndian( false )
, mNextCursorId( 0 )
, mShared( shared )
, mTransaction( transaction )
, mLock( QMutex::Recursive )
{
QgsDebugMsg( QStringLiteral( "New PostgreSQL connection for " ) + conninfo );
// expand connectionInfo
QgsDataSourceUri uri( conninfo );
QString expandedConnectionInfo = uri.connectionInfo( true );
auto addDefaultTimeout = []( QString & connectString )
{
if ( !connectString.contains( QStringLiteral( "connect_timeout=" ) ) )
{
// add default timeout
QgsSettings settings;
int timeout = settings.value( QStringLiteral( "PostgreSQL/default_timeout" ), PG_DEFAULT_TIMEOUT, QgsSettings::Providers ).toInt();
connectString += QStringLiteral( " connect_timeout=%1" ).arg( timeout );
}
};
addDefaultTimeout( expandedConnectionInfo );
mConn = PQconnectdb( expandedConnectionInfo.toLocal8Bit() ); // use what is set based on locale; after connecting, use Utf8
// remove temporary cert/key/CA if they exist
QgsDataSourceUri expandedUri( expandedConnectionInfo );
QStringList parameters;
parameters << QStringLiteral( "sslcert" ) << QStringLiteral( "sslkey" ) << QStringLiteral( "sslrootcert" );
Q_FOREACH ( const QString ¶m, parameters )
{
if ( expandedUri.hasParam( param ) )
{
QString fileName = expandedUri.param( param );
fileName.remove( QStringLiteral( "'" ) );
QFile file( fileName );
// set minimal permission to allow removing on Win.
// On linux and Mac if file is set with QFile::ReadUser
// does not create problem removing certs
if ( !file.setPermissions( QFile::WriteOwner ) )
{
QString errorMsg = tr( "Cannot set WriteOwner permission to cert: %0 to allow removing it" ).arg( file.fileName() );
PQfinish();
QgsMessageLog::logMessage( tr( "Client security failure" ) + '\n' + errorMsg, tr( "PostGIS" ) );
mRef = 0;
return;
}
if ( !file.remove() )
{
QString errorMsg = tr( "Cannot remove cert: %0" ).arg( file.fileName() );
PQfinish();
QgsMessageLog::logMessage( tr( "Client security failure" ) + '\n' + errorMsg, tr( "PostGIS" ) );
mRef = 0;
return;
}
}
}
// check the connection status
if ( PQstatus() != CONNECTION_OK )
{
QString username = uri.username();
QString password = uri.password();
QgsCredentials::instance()->lock();
int i = 0;
while ( PQstatus() != CONNECTION_OK && i < 5 )
{
++i;
bool ok = QgsCredentials::instance()->get( conninfo, username, password, PQerrorMessage() );
if ( !ok )
break;
PQfinish();
if ( !username.isEmpty() )
uri.setUsername( username );
if ( !password.isEmpty() )
uri.setPassword( password );
QgsDebugMsg( "Connecting to " + uri.connectionInfo( false ) );
QString connectString = uri.connectionInfo();
addDefaultTimeout( connectString );
mConn = PQconnectdb( connectString.toLocal8Bit() );
}
if ( PQstatus() == CONNECTION_OK )
QgsCredentials::instance()->put( conninfo, username, password );
QgsCredentials::instance()->unlock();
}
if ( PQstatus() != CONNECTION_OK )
{
QString errorMsg = PQerrorMessage();
PQfinish();
QgsMessageLog::logMessage( tr( "Connection to database failed" ) + '\n' + errorMsg, tr( "PostGIS" ) );
mRef = 0;
return;
}
//set client encoding to Unicode because QString uses UTF-8 anyway
QgsDebugMsg( QStringLiteral( "setting client encoding to UNICODE" ) );
int errcode = PQsetClientEncoding( mConn, QStringLiteral( "UNICODE" ).toLocal8Bit() );
if ( errcode == 0 )
{
QgsDebugMsg( QStringLiteral( "encoding successfully set" ) );
}
else if ( errcode == -1 )
{
QgsMessageLog::logMessage( tr( "error in setting encoding" ), tr( "PostGIS" ) );
}
else
{
QgsMessageLog::logMessage( tr( "undefined return value from encoding setting" ), tr( "PostGIS" ) );
}
QgsDebugMsg( QStringLiteral( "Connection to the database was successful" ) );
deduceEndian();
/* Check to see if we have working PostGIS support */
if ( !postgisVersion().isNull() )
{
/* Check to see if we have GEOS support and if not, warn the user about
the problems they will see :) */
QgsDebugMsg( QStringLiteral( "Checking for GEOS support" ) );
if ( !hasGEOS() )
{
QgsMessageLog::logMessage( tr( "Your PostGIS installation has no GEOS support. Feature selection and identification will not work properly. Please install PostGIS with GEOS support (http://geos.refractions.net)" ), tr( "PostGIS" ) );
}
if ( hasTopology() )
{
QgsDebugMsg( QStringLiteral( "Topology support available!" ) );
}
}
if ( mPostgresqlVersion >= 90000 )
{
PQexecNR( QStringLiteral( "SET application_name='QGIS'" ) );
}
PQsetNoticeProcessor( mConn, noticeProcessor, nullptr );
}
QgsPostgresConn::~QgsPostgresConn()
{
Q_ASSERT( mRef == 0 );
if ( mConn )
::PQfinish( mConn );
mConn = nullptr;
}
void QgsPostgresConn::unref()
{
if ( --mRef > 0 )
return;
if ( mShared )
{
QMap<QString, QgsPostgresConn *> &connections = mReadOnly ? sConnectionsRO : sConnectionsRW;
QString key = connections.key( this, QString() );
Q_ASSERT( !key.isNull() );
connections.remove( key );
}
delete this;
}
/* private */
void QgsPostgresConn::addColumnInfo( QgsPostgresLayerProperty &layerProperty, const QString &schemaName, const QString &viewName, bool fetchPkCandidates )
{
// TODO: optimize this query when pk candidates aren't needed
// could use array_agg() and count()
// array output would look like this: "{One,tWo}"
QString sql = QStringLiteral( "SELECT attname, CASE WHEN typname = ANY(ARRAY['geometry','geography','topogeometry']) THEN 1 ELSE null END AS isSpatial FROM pg_attribute JOIN pg_type ON atttypid=pg_type.oid WHERE attrelid=regclass('%1.%2') AND attnum>0 ORDER BY attnum" )
.arg( quotedIdentifier( schemaName ),
quotedIdentifier( viewName ) );
//QgsDebugMsg( sql );
QgsPostgresResult colRes( PQexec( sql ) );
layerProperty.pkCols.clear();
layerProperty.nSpCols = 0;
if ( colRes.PQresultStatus() == PGRES_TUPLES_OK )
{
for ( int i = 0; i < colRes.PQntuples(); i++ )
{
if ( fetchPkCandidates )
{
//QgsDebugMsg( colRes.PQgetvalue( i, 0 ) );
layerProperty.pkCols << colRes.PQgetvalue( i, 0 );
}
if ( colRes.PQgetisnull( i, 1 ) == 0 )
{
++layerProperty.nSpCols;
}
}
}
else
{
QgsMessageLog::logMessage( tr( "SQL: %1\nresult: %2\nerror: %3\n" ).arg( sql ).arg( colRes.PQresultStatus() ).arg( colRes.PQresultErrorMessage() ), tr( "PostGIS" ) );
}
}
bool QgsPostgresConn::getTableInfo( bool searchGeometryColumnsOnly, bool searchPublicOnly, bool allowGeometrylessTables, const QString &schema )
{
int nColumns = 0;
int foundInTables = 0;
QgsPostgresResult result;
QgsPostgresLayerProperty layerProperty;
//QgsDebugMsg( QStringLiteral( "Entering." ) );
mLayersSupported.clear();
for ( int i = SctGeometry; i <= SctPcPatch; ++i )
{
QString sql, tableName, schemaName, columnName, typeName, sridName, gtableName, dimName;
QgsPostgresGeometryColumnType columnType = SctGeometry;
if ( i == SctGeometry )
{
tableName = QStringLiteral( "l.f_table_name" );
schemaName = QStringLiteral( "l.f_table_schema" );
columnName = QStringLiteral( "l.f_geometry_column" );
typeName = QStringLiteral( "upper(l.type)" );
sridName = QStringLiteral( "l.srid" );
dimName = QStringLiteral( "l.coord_dimension" );
gtableName = QStringLiteral( "geometry_columns" );
columnType = SctGeometry;
}
else if ( i == SctGeography )
{
tableName = QStringLiteral( "l.f_table_name" );
schemaName = QStringLiteral( "l.f_table_schema" );
columnName = QStringLiteral( "l.f_geography_column" );
typeName = QStringLiteral( "upper(l.type)" );
sridName = QStringLiteral( "l.srid" );
dimName = QStringLiteral( "2" );
gtableName = QStringLiteral( "geography_columns" );
columnType = SctGeography;
}
else if ( i == SctTopoGeometry )
{
if ( !hasTopology() )
continue;
schemaName = QStringLiteral( "l.schema_name" );
tableName = QStringLiteral( "l.table_name" );
columnName = QStringLiteral( "l.feature_column" );
typeName = "CASE "
"WHEN l.feature_type = 1 THEN 'MULTIPOINT' "
"WHEN l.feature_type = 2 THEN 'MULTILINESTRING' "
"WHEN l.feature_type = 3 THEN 'MULTIPOLYGON' "
"WHEN l.feature_type = 4 THEN 'GEOMETRYCOLLECTION' "
"END AS type";
sridName = QStringLiteral( "(SELECT srid FROM topology.topology t WHERE l.topology_id=t.id)" );
dimName = QStringLiteral( "2" );
gtableName = QStringLiteral( "topology.layer" );
columnType = SctTopoGeometry;
}
else if ( i == SctPcPatch )
{
if ( !hasPointcloud() )
continue;
tableName = QStringLiteral( "l.\"table\"" );
schemaName = QStringLiteral( "l.\"schema\"" );
columnName = QStringLiteral( "l.\"column\"" );
typeName = QStringLiteral( "'POLYGON'" );
sridName = QStringLiteral( "l.srid" );
dimName = QStringLiteral( "2" );
gtableName = QStringLiteral( "pointcloud_columns" );
columnType = SctPcPatch;
}
else
{
QgsMessageLog::logMessage( tr( "Unsupported spatial column type %1" )
.arg( displayStringForGeomType( ( QgsPostgresGeometryColumnType )i ) ) );
continue;
}
// The following query returns only tables that exist and the user has SELECT privilege on.
// Can't use regclass here because table must exist, else error occurs.
sql = QString( "SELECT %1,%2,%3,%4,%5,%6,c.relkind,obj_description(c.oid)"
" FROM %7 l,pg_class c,pg_namespace n"
" WHERE c.relname=%1"
" AND %2=n.nspname"
" AND n.oid=c.relnamespace"
" AND has_schema_privilege(n.nspname,'usage')"
" AND has_table_privilege('\"'||n.nspname||'\".\"'||c.relname||'\"','select')" // user has select privilege
)
.arg( tableName, schemaName, columnName, typeName, sridName, dimName, gtableName );
if ( searchPublicOnly )
sql += QLatin1String( " AND n.nspname='public'" );
if ( !schema.isEmpty() )
sql += QStringLiteral( " AND %1='%2'" ).arg( schemaName, schema );
sql += QStringLiteral( " ORDER BY n.nspname,c.relname,%1" ).arg( columnName );
//QgsDebugMsg( "getting table info: " + sql );
result = PQexec( sql, i == 0 );
if ( result.PQresultStatus() != PGRES_TUPLES_OK )
{
PQexecNR( QStringLiteral( "COMMIT" ) );
continue;
}
for ( int idx = 0; idx < result.PQntuples(); idx++ )
{
QString tableName = result.PQgetvalue( idx, 0 );
QString schemaName = result.PQgetvalue( idx, 1 );
QString column = result.PQgetvalue( idx, 2 );
QString type = result.PQgetvalue( idx, 3 );
QString ssrid = result.PQgetvalue( idx, 4 );
int dim = result.PQgetvalue( idx, 5 ).toInt();
QString relkind = result.PQgetvalue( idx, 6 );
bool isView = relkind == QLatin1String( "v" ) || relkind == QLatin1String( "m" );
bool isMaterializedView = relkind == QLatin1String( "m" );
QString comment = result.PQgetvalue( idx, 7 );
int srid = ssrid.isEmpty() ? std::numeric_limits<int>::min() : ssrid.toInt();
if ( majorVersion() >= 2 && srid == 0 )
{
// 0 doesn't constraint => detect
srid = std::numeric_limits<int>::min();
}
#if 0
QgsDebugMsg( QStringLiteral( "%1 : %2.%3.%4: %5 %6 %7 %8" )
.arg( gtableName )
.arg( schemaName ).arg( tableName ).arg( column )
.arg( type )
.arg( srid )
.arg( relkind )
.arg( dim ) );
#endif
layerProperty.schemaName = schemaName;
layerProperty.tableName = tableName;
layerProperty.geometryColName = column;
layerProperty.geometryColType = columnType;
if ( dim == 3 && !type.endsWith( 'M' ) )
type += QLatin1String( "Z" );
else if ( dim == 4 )
type += QLatin1String( "ZM" );
layerProperty.types = QList<QgsWkbTypes::Type>() << ( QgsPostgresConn::wkbTypeFromPostgis( type ) );
layerProperty.srids = QList<int>() << srid;
layerProperty.sql.clear();
layerProperty.relKind = relkind;
layerProperty.isView = isView;
layerProperty.isMaterializedView = isMaterializedView;
layerProperty.tableComment = comment;
addColumnInfo( layerProperty, schemaName, tableName, isView );
if ( isView && layerProperty.pkCols.empty() )
{
//QgsDebugMsg( QStringLiteral( "no key columns found." ) );
continue;
}
mLayersSupported << layerProperty;
nColumns++;
}
foundInTables |= 1 << i;
}
//search for geometry columns in tables that are not in the geometry_columns metatable
if ( !searchGeometryColumnsOnly )
{
// Now have a look for geometry columns that aren't in the geometry_columns table.
QString sql = "SELECT"
" c.relname"
",n.nspname"
",a.attname"
",c.relkind"
",CASE WHEN t.typname IN ('geometry','geography','topogeometry') THEN t.typname ELSE b.typname END AS coltype"
",obj_description(c.oid)"
" FROM pg_attribute a"
" JOIN pg_class c ON c.oid=a.attrelid"
" JOIN pg_namespace n ON n.oid=c.relnamespace"
" JOIN pg_type t ON t.oid=a.atttypid"
" LEFT JOIN pg_type b ON b.oid=t.typbasetype"
" WHERE c.relkind IN ('v','r','m','p')"
" AND has_schema_privilege( n.nspname, 'usage' )"
" AND has_table_privilege( '\"' || n.nspname || '\".\"' || c.relname || '\"', 'select' )"
" AND (t.typname IN ('geometry','geography','topogeometry') OR b.typname IN ('geometry','geography','topogeometry','pcpatch'))";
// user has select privilege
if ( searchPublicOnly )
sql += QLatin1String( " AND n.nspname='public'" );
if ( !schema.isEmpty() )
sql += QStringLiteral( " AND n.nspname='%2'" ).arg( schema );
// skip columns of which we already derived information from the metadata tables
if ( nColumns > 0 )
{
if ( foundInTables & ( 1 << SctGeometry ) )
{
sql += QLatin1String( " AND (n.nspname,c.relname,a.attname) NOT IN (SELECT f_table_schema,f_table_name,f_geometry_column FROM geometry_columns)" );
}
if ( foundInTables & ( 1 << SctGeography ) )
{
sql += QLatin1String( " AND (n.nspname,c.relname,a.attname) NOT IN (SELECT f_table_schema,f_table_name,f_geography_column FROM geography_columns)" );
}
if ( foundInTables & ( 1 << SctPcPatch ) )
{
sql += QLatin1String( " AND (n.nspname,c.relname,a.attname) NOT IN (SELECT \"schema\",\"table\",\"column\" FROM pointcloud_columns)" );
}
}
//QgsDebugMsg( "sql: " + sql );
result = PQexec( sql );
if ( result.PQresultStatus() != PGRES_TUPLES_OK )
{
QgsMessageLog::logMessage( tr( "Database connection was successful, but the accessible tables could not be determined. The error message from the database was:\n%1\n" )
.arg( result.PQresultErrorMessage() ),
tr( "PostGIS" ) );
PQexecNR( QStringLiteral( "COMMIT" ) );
return false;
}
for ( int i = 0; i < result.PQntuples(); i++ )
{
// Have the column name, schema name and the table name. The concept of a
// catalog doesn't exist in PostgreSQL so we ignore that, but we
// do need to get the geometry type.
QString tableName = result.PQgetvalue( i, 0 ); // relname
QString schemaName = result.PQgetvalue( i, 1 ); // nspname
QString column = result.PQgetvalue( i, 2 ); // attname
QString relkind = result.PQgetvalue( i, 3 ); // relation kind
QString coltype = result.PQgetvalue( i, 4 ); // column type
bool isView = relkind == QLatin1String( "v" ) || relkind == QLatin1String( "m" );
bool isMaterializedView = relkind == QLatin1String( "m" );
QString comment = result.PQgetvalue( i, 5 ); // table comment
//QgsDebugMsg( QStringLiteral( "%1.%2.%3: %4" ).arg( schemaName ).arg( tableName ).arg( column ).arg( relkind ) );
layerProperty.types = QList<QgsWkbTypes::Type>() << QgsWkbTypes::Unknown;
layerProperty.srids = QList<int>() << std::numeric_limits<int>::min();
layerProperty.schemaName = schemaName;
layerProperty.tableName = tableName;
layerProperty.geometryColName = column;
layerProperty.relKind = relkind;
layerProperty.isView = isView;
layerProperty.isMaterializedView = isMaterializedView;
layerProperty.tableComment = comment;
if ( coltype == QLatin1String( "geometry" ) )
{
layerProperty.geometryColType = SctGeometry;
}
else if ( coltype == QLatin1String( "geography" ) )
{
layerProperty.geometryColType = SctGeography;
}
else if ( coltype == QLatin1String( "topogeometry" ) )
{
layerProperty.geometryColType = SctTopoGeometry;
}
else if ( coltype == QLatin1String( "pcpatch" ) )
{
layerProperty.geometryColType = SctPcPatch;
}
else
{
Q_ASSERT( !"Unknown geometry type" );
}
addColumnInfo( layerProperty, schemaName, tableName, isView );
if ( isView && layerProperty.pkCols.empty() )
{
//QgsDebugMsg( QStringLiteral( "no key columns found." ) );
continue;
}
layerProperty.sql.clear();
mLayersSupported << layerProperty;
nColumns++;
}
}
if ( allowGeometrylessTables )
{
QString sql = "SELECT "
"pg_class.relname"
",pg_namespace.nspname"
",pg_class.relkind"
",obj_description(pg_class.oid)"
" FROM "
" pg_class"
",pg_namespace"
" WHERE pg_namespace.oid=pg_class.relnamespace"
" AND has_schema_privilege(pg_namespace.nspname,'usage')"
" AND has_table_privilege('\"' || pg_namespace.nspname || '\".\"' || pg_class.relname || '\"','select')"
" AND pg_class.relkind IN ('v','r','m','p')";
// user has select privilege
if ( searchPublicOnly )
sql += QLatin1String( " AND pg_namespace.nspname='public'" );
if ( !schema.isEmpty() )
sql += QStringLiteral( " AND pg_namespace.nspname='%2'" ).arg( schema );
//QgsDebugMsg( "sql: " + sql );
result = PQexec( sql );
if ( result.PQresultStatus() != PGRES_TUPLES_OK )
{
QgsMessageLog::logMessage( tr( "Database connection was successful, but the accessible tables could not be determined.\nThe error message from the database was:\n%1" )
.arg( result.PQresultErrorMessage() ),
tr( "PostGIS" ) );
return false;
}
for ( int i = 0; i < result.PQntuples(); i++ )
{
QString table = result.PQgetvalue( i, 0 ); // relname
QString schema = result.PQgetvalue( i, 1 ); // nspname
QString relkind = result.PQgetvalue( i, 2 ); // relation kind
bool isView = relkind == QLatin1String( "v" ) || relkind == QLatin1String( "m" );
bool isMaterializedView = relkind == QLatin1String( "m" );
QString comment = result.PQgetvalue( i, 3 ); // table comment
//QgsDebugMsg( QStringLiteral( "%1.%2: %3" ).arg( schema ).arg( table ).arg( relkind ) );
layerProperty.types = QList<QgsWkbTypes::Type>() << QgsWkbTypes::NoGeometry;
layerProperty.srids = QList<int>() << std::numeric_limits<int>::min();
layerProperty.schemaName = schema;
layerProperty.tableName = table;
layerProperty.geometryColName = QString();
layerProperty.geometryColType = SctNone;
layerProperty.relKind = relkind;
layerProperty.isView = isView;
layerProperty.isMaterializedView = isMaterializedView;
layerProperty.tableComment = comment;
//check if we've already added this layer in some form
bool alreadyFound = false;
Q_FOREACH ( const QgsPostgresLayerProperty &foundLayer, mLayersSupported )
{
if ( foundLayer.schemaName == schema && foundLayer.tableName == table )
{
//already found this table
alreadyFound = true;
break;
}
}
if ( alreadyFound )
continue;
addColumnInfo( layerProperty, schema, table, isView );
layerProperty.sql.clear();
mLayersSupported << layerProperty;
nColumns++;
}
}
if ( nColumns == 0 && schema.isEmpty() )
{
QgsMessageLog::logMessage( tr( "Database connection was successful, but the accessible tables could not be determined." ), tr( "PostGIS" ) );
}
return true;
}
bool QgsPostgresConn::supportedLayers( QVector<QgsPostgresLayerProperty> &layers, bool searchGeometryColumnsOnly, bool searchPublicOnly, bool allowGeometrylessTables, const QString &schema )
{
// Get the list of supported tables
if ( !getTableInfo( searchGeometryColumnsOnly, searchPublicOnly, allowGeometrylessTables, schema ) )
{
QgsMessageLog::logMessage( tr( "Unable to get list of spatially enabled tables from the database" ), tr( "PostGIS" ) );
return false;
}
layers = mLayersSupported;
//QgsDebugMsg( QStringLiteral( "Exiting." ) );
return true;
}
bool QgsPostgresConn::getSchemas( QList<QgsPostgresSchemaProperty> &schemas )
{
schemas.clear();
QgsPostgresResult result;
QString sql = QStringLiteral( "SELECT nspname, pg_get_userbyid(nspowner), pg_catalog.obj_description(oid) FROM pg_namespace WHERE nspname !~ '^pg_' AND nspname != 'information_schema' ORDER BY nspname" );
result = PQexec( sql, true );
if ( result.PQresultStatus() != PGRES_TUPLES_OK )
{
PQexecNR( QStringLiteral( "COMMIT" ) );
return false;
}
for ( int idx = 0; idx < result.PQntuples(); idx++ )
{
QgsPostgresSchemaProperty schema;
schema.name = result.PQgetvalue( idx, 0 );
schema.owner = result.PQgetvalue( idx, 1 );
schema.description = result.PQgetvalue( idx, 2 );
schemas << schema;
}
return true;
}
/**
* Check to see if GEOS is available
*/
bool QgsPostgresConn::hasGEOS()
{
// make sure info is up to date for the current connection
postgisVersion();
return mGeosAvailable;
}
/**
* Check to see if topology is available
*/
bool QgsPostgresConn::hasTopology()
{
// make sure info is up to date for the current connection
postgisVersion();
return mTopologyAvailable;
}
/**
* Check to see if pointcloud is available
*/
bool QgsPostgresConn::hasPointcloud()
{
// make sure info is up to date for the current connection
postgisVersion();
return mPointcloudAvailable;
}
/* Functions for determining available features in postGIS */
QString QgsPostgresConn::postgisVersion()
{
if ( mGotPostgisVersion )
return mPostgisVersionInfo;
mPostgresqlVersion = PQserverVersion( mConn );
QgsPostgresResult result( PQexec( QStringLiteral( "SELECT postgis_version()" ), false ) );
if ( result.PQntuples() != 1 )
{
QgsMessageLog::logMessage( tr( "No PostGIS support in the database." ), tr( "PostGIS" ) );
mGotPostgisVersion = true;
return QString();
}
mPostgisVersionInfo = result.PQgetvalue( 0, 0 );
QgsDebugMsg( "PostGIS version info: " + mPostgisVersionInfo );
QStringList postgisParts = mPostgisVersionInfo.split( ' ', QString::SkipEmptyParts );
// Get major and minor version
QStringList postgisVersionParts = postgisParts[0].split( '.', QString::SkipEmptyParts );
if ( postgisVersionParts.size() < 2 )
{
QgsMessageLog::logMessage( tr( "Could not parse postgis version string '%1'" ).arg( mPostgisVersionInfo ), tr( "PostGIS" ) );
return QString();
}
mPostgisVersionMajor = postgisVersionParts[0].toInt();
mPostgisVersionMinor = postgisVersionParts[1].toInt();
mUseWkbHex = mPostgisVersionMajor < 1;
// apparently PostGIS 1.5.2 doesn't report capabilities in postgis_version() anymore
if ( mPostgisVersionMajor > 1 || ( mPostgisVersionMajor == 1 && mPostgisVersionMinor >= 5 ) )
{
result = PQexec( QStringLiteral( "SELECT postgis_geos_version(),postgis_proj_version()" ) );
mGeosAvailable = result.PQntuples() == 1 && !result.PQgetisnull( 0, 0 );
mProjAvailable = result.PQntuples() == 1 && !result.PQgetisnull( 0, 1 );
QgsDebugMsg( QStringLiteral( "geos:%1 proj:%2" )
.arg( mGeosAvailable ? result.PQgetvalue( 0, 0 ) : "none",
mProjAvailable ? result.PQgetvalue( 0, 1 ) : "none" ) );
mGistAvailable = true;
}
else
{
// assume no capabilities
mGeosAvailable = false;
mGistAvailable = false;
mProjAvailable = false;
// parse out the capabilities and store them
QStringList geos = postgisParts.filter( QStringLiteral( "GEOS" ) );
if ( geos.size() == 1 )
{
mGeosAvailable = ( geos[0].indexOf( QLatin1String( "=1" ) ) > -1 );
}
QStringList gist = postgisParts.filter( QStringLiteral( "STATS" ) );
if ( gist.size() == 1 )
{
mGistAvailable = ( gist[0].indexOf( QLatin1String( "=1" ) ) > -1 );
}
QStringList proj = postgisParts.filter( QStringLiteral( "PROJ" ) );
if ( proj.size() == 1 )
{
mProjAvailable = ( proj[0].indexOf( QLatin1String( "=1" ) ) > -1 );
}
}
// checking for topology support
QgsDebugMsg( QStringLiteral( "Checking for topology support" ) );
mTopologyAvailable = false;
if ( mPostgisVersionMajor > 1 )
{
QgsPostgresResult result( PQexec( QStringLiteral( "SELECT EXISTS ( SELECT c.oid FROM pg_class AS c JOIN pg_namespace AS n ON c.relnamespace=n.oid WHERE n.nspname='topology' AND c.relname='topology' )" ) ) );
if ( result.PQntuples() >= 1 && result.PQgetvalue( 0, 0 ) == QLatin1String( "t" ) )
{
mTopologyAvailable = true;
}
}
mGotPostgisVersion = true;
if ( mPostgresqlVersion >= 90000 )
{
QgsDebugMsg( QStringLiteral( "Checking for pointcloud support" ) );
result = PQexec( QStringLiteral( "SELECT oid FROM pg_catalog.pg_extension WHERE extname = 'pointcloud_postgis'" ), false );
if ( result.PQntuples() == 1 )
{
mPointcloudAvailable = true;
QgsDebugMsg( QStringLiteral( "Pointcloud support available!" ) );
}
}
return mPostgisVersionInfo;
}
QString QgsPostgresConn::quotedIdentifier( const QString &ident )
{
QString result = ident;
result.replace( '"', QLatin1String( "\"\"" ) );
return result.prepend( '\"' ).append( '\"' );
}
static QString quotedString( const QString &v )
{
QString result = v;
result.replace( '\'', QLatin1String( "''" ) );
if ( result.contains( '\\' ) )
return result.replace( '\\', QLatin1String( "\\\\" ) ).prepend( "E'" ).append( '\'' );
else
return result.prepend( '\'' ).append( '\'' );
}
static QString doubleQuotedMapValue( const QString &v )
{
QString result = v;
return "\"" + result.replace( '\\', QLatin1String( "\\\\\\\\" ) ).replace( '\"', QLatin1String( "\\\\\"" ) ).replace( '\'', QLatin1String( "\\'" ) ) + "\"";
}
static QString quotedMap( const QVariantMap &map )
{
//to store properly it should be decided if it's a hstore or a json/jsonb field here...
QString ret;
for ( QVariantMap::const_iterator i = map.constBegin(); i != map.constEnd(); ++i )
{
if ( !ret.isEmpty() )
{
ret += QLatin1String( "," );
}