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qgspostgresconn.cpp
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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 "qgslogger.h"
#include "qgsdatasourceuri.h"
#include "qgsmessagelog.h"
#include "qgscredentials.h"
#include "qgsfield.h"
#include "qgspgtablemodel.h"
#include <QApplication>
#include <QSettings>
#include <QThread>
#include <climits>
// for htonl
#ifdef Q_OS_WIN
#include <winsock.h>
#else
#include <netinet/in.h>
#endif
QgsPostgresResult::~QgsPostgresResult()
{
if ( mRes )
::PQclear( mRes );
mRes = 0;
}
QgsPostgresResult &QgsPostgresResult::operator=( PGresult * theRes )
{
if ( mRes )
::PQclear( mRes );
mRes = theRes;
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::null
: 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 );
}
Oid QgsPostgresResult::PQoidValue()
{
Q_ASSERT( mRes );
return ::PQoidValue( mRes );
}
QMap<QString, QgsPostgresConn *> QgsPostgresConn::sConnectionsRO;
QMap<QString, QgsPostgresConn *> QgsPostgresConn::sConnectionsRW;
const int QgsPostgresConn::sGeomTypeSelectLimit = 100;
QgsPostgresConn *QgsPostgresConn::connectDb( QString conninfo, bool readonly, bool shared )
{
QMap<QString, QgsPostgresConn *> &connections =
readonly ? QgsPostgresConn::sConnectionsRO : QgsPostgresConn::sConnectionsRW;
if ( shared )
{
if ( connections.contains( conninfo ) )
{
QgsDebugMsg( QString( "Using cached connection for %1" ).arg( conninfo ) );
connections[conninfo]->mRef++;
return connections[conninfo];
}
}
QgsPostgresConn *conn = new QgsPostgresConn( conninfo, readonly, shared );
if ( conn->mRef == 0 )
{
delete conn;
return 0;
}
if ( shared )
{
connections.insert( conninfo, conn );
}
return conn;
}
QgsPostgresConn::QgsPostgresConn( QString conninfo, bool readOnly, bool shared )
: mRef( 1 )
, mOpenCursors( 0 )
, mConnInfo( conninfo )
, mGotPostgisVersion( false )
, mReadOnly( readOnly )
, mNextCursorId( 0 )
, mShared( shared )
{
QgsDebugMsg( QString( "New PostgreSQL connection for " ) + conninfo );
mConn = PQconnectdb( conninfo.toLocal8Bit() ); // use what is set based on locale; after connecting, use Utf8
// check the connection status
if ( PQstatus() != CONNECTION_OK )
{
QgsDataSourceURI uri( conninfo );
QString username = uri.username();
QString password = uri.password();
QgsCredentials::instance()->lock();
while ( PQstatus() != CONNECTION_OK )
{
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() );
mConn = PQconnectdb( uri.connectionInfo().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( "setting client encoding to UNICODE" );
int errcode = PQsetClientEncoding( mConn, QString( "UNICODE" ).toLocal8Bit() );
if ( errcode == 0 )
{
QgsDebugMsg( "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( "Connection to the database was successful" );
deduceEndian();
/* Check to see if we have working PostGIS support */
if ( postgisVersion().isNull() )
{
QgsMessageLog::logMessage( tr( "Your database has no working PostGIS support." ), tr( "PostGIS" ) );
PQfinish();
mRef = 0;
return;
}
if ( mPostgresqlVersion >= 90000 )
{
PQexecNR( "SET application_name='QGIS'" );
}
/* Check to see if we have GEOS support and if not, warn the user about
the problems they will see :) */
QgsDebugMsg( "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( "Topology support available!" );
}
}
QgsPostgresConn::~QgsPostgresConn()
{
Q_ASSERT( mRef == 0 );
if ( mConn )
::PQfinish( mConn );
mConn = 0;
}
void QgsPostgresConn::disconnect()
{
if ( --mRef > 0 )
return;
if ( mShared )
{
QMap<QString, QgsPostgresConn *>& connections = mReadOnly ? sConnectionsRO : sConnectionsRW;
QString key = connections.key( this, QString::null );
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 = QString( "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')" )
.arg( quotedIdentifier( schemaName ) )
.arg( 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 )
{
int nColumns = 0;
int foundInTables = 0;
QgsPostgresResult result;
QgsPostgresLayerProperty layerProperty;
QgsDebugMsg( "Entering." );
mLayersSupported.clear();
for ( int i = 0; i < ( hasTopology() ? 3 : 2 ); i++ )
{
QString sql, tableName, schemaName, columnName, typeName, sridName, gtableName, dimName;
QgsPostgresGeometryColumnType columnType = sctGeometry;
if ( i == 0 )
{
tableName = "l.f_table_name";
schemaName = "l.f_table_schema";
columnName = "l.f_geometry_column";
typeName = "upper(l.type)";
sridName = "l.srid";
dimName = "l.coord_dimension";
gtableName = "geometry_columns";
columnType = sctGeometry;
}
else if ( i == 1 )
{
tableName = "l.f_table_name";
schemaName = "l.f_table_schema";
columnName = "l.f_geography_column";
typeName = "upper(l.type)";
sridName = "l.srid";
dimName = "2";
gtableName = "geography_columns";
columnType = sctGeography;
}
else if ( i == 2 )
{
schemaName = "l.schema_name";
tableName = "l.table_name";
columnName = "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 = "(SELECT srid FROM topology.topology t WHERE l.topology_id=t.id)";
dimName = "2";
gtableName = "topology.layer";
columnType = sctTopoGeometry;
}
// 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"
" 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 ).arg( schemaName ).arg( columnName ).arg( typeName ).arg( sridName ).arg( dimName ).arg( gtableName );
if ( searchPublicOnly )
sql += " AND n.nspname='public'";
sql += QString( " 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( "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 == "v" || relkind == "m";
int srid = ssrid.isEmpty() ? INT_MIN : ssrid.toInt();
if ( majorVersion() >= 2 && srid == 0 )
{
// 0 doesn't constraint => detect
srid = INT_MIN;
}
QgsDebugMsg( QString( "%1 : %2.%3.%4: %5 %6 %7 %8" )
.arg( gtableName )
.arg( schemaName ).arg( tableName ).arg( column )
.arg( type )
.arg( srid )
.arg( relkind )
.arg( dim ) );
layerProperty.schemaName = schemaName;
layerProperty.tableName = tableName;
layerProperty.geometryColName = column;
layerProperty.geometryColType = columnType;
layerProperty.types = QList<QGis::WkbType>() << ( QgsPostgresConn::wkbTypeFromPostgis( type ) );
layerProperty.srids = QList<int>() << srid;
layerProperty.sql = "";
layerProperty.force2d = dim == 4;
addColumnInfo( layerProperty, schemaName, tableName, isView );
if ( isView && layerProperty.pkCols.empty() )
{
QgsDebugMsg( "no key columns found." );
continue;
}
mLayersSupported << layerProperty;
nColumns++;
}
foundInTables |= 1 << i;
}
if ( nColumns == 0 )
{
QgsMessageLog::logMessage( tr( "Database connection was successful, but the accessible tables could not be determined." ), tr( "PostGIS" ) );
}
//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"
" 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')"
" 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'))";
// user has select privilege
if ( searchPublicOnly )
sql += " AND n.nspname='public'";
// skip columns of which we already derived information from the metadata tables
if ( nColumns > 0 )
{
if ( foundInTables & 1 )
{
sql += " AND (n.nspname,c.relname,a.attname) NOT IN (SELECT f_table_schema,f_table_name,f_geometry_column FROM geometry_columns)";
}
if ( foundInTables & 2 )
{
sql += " AND (n.nspname,c.relname,a.attname) NOT IN (SELECT f_table_schema,f_table_name,f_geography_column FROM geography_columns)";
}
if ( foundInTables & 4 )
{
sql += " AND (n.nspname,c.relname,a.attname) NOT IN (SELECT schema_name,table_name,feature_column FROM topology.layer)";
}
}
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( "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.
// Make the assumption that the geometry type for the first
// row is the same as for all other rows.
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 == "v" || relkind == "m";
QgsDebugMsg( QString( "%1.%2.%3: %4" ).arg( schemaName ).arg( tableName ).arg( column ).arg( relkind ) );
layerProperty.types.clear();
layerProperty.srids.clear();
layerProperty.schemaName = schemaName;
layerProperty.tableName = tableName;
layerProperty.geometryColName = column;
if ( coltype == "geometry" )
{
layerProperty.geometryColType = sctGeometry;
}
else if ( coltype == "geography" )
{
layerProperty.geometryColType = sctGeography;
}
else if ( coltype == "topogeometry" )
{
layerProperty.geometryColType = sctTopoGeometry;
}
else
{
Q_ASSERT( !"Unknown geometry type" );
}
addColumnInfo( layerProperty, schemaName, tableName, isView );
if ( isView && layerProperty.pkCols.empty() )
{
QgsDebugMsg( "no key columns found." );
continue;
}
layerProperty.sql = "";
mLayersSupported << layerProperty;
nColumns++;
}
}
if ( allowGeometrylessTables )
{
QString sql = "SELECT "
"pg_class.relname"
",pg_namespace.nspname"
",pg_class.relkind"
" 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')";
// user has select privilege
if ( searchPublicOnly )
sql += " AND pg_namespace.nspname='public'";
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 == "v" || relkind == "m";
QgsDebugMsg( QString( "%1.%2: %3" ).arg( schema ).arg( table ).arg( relkind ) );
layerProperty.types = QList<QGis::WkbType>() << QGis::WKBNoGeometry;
layerProperty.srids = QList<int>() << INT_MIN;
layerProperty.schemaName = schema;
layerProperty.tableName = table;
layerProperty.geometryColName = QString::null;
layerProperty.geometryColType = sctNone;
addColumnInfo( layerProperty, schema, table, isView );
layerProperty.sql = "";
mLayersSupported << layerProperty;
nColumns++;
}
}
if ( nColumns == 0 )
{
QgsMessageLog::logMessage( tr( "Database connection was successful, but no accessible tables were found. Please verify that you have SELECT privilege on a table carrying PostGIS geometry." ), tr( "PostGIS" ) );
}
return true;
}
bool QgsPostgresConn::supportedLayers( QVector<QgsPostgresLayerProperty> &layers, bool searchGeometryColumnsOnly, bool searchPublicOnly, bool allowGeometrylessTables )
{
// Get the list of supported tables
if ( !getTableInfo( searchGeometryColumnsOnly, searchPublicOnly, allowGeometrylessTables ) )
{
QgsMessageLog::logMessage( tr( "Unable to get list of spatially enabled tables from the database" ), tr( "PostGIS" ) );
return false;
}
layers = mLayersSupported;
QgsDebugMsg( "Exiting." );
return true;
}
/**
* Check to see if GEOS is available
*/
bool QgsPostgresConn::hasGEOS()
{
// make sure info is up to date for the current connection
postgisVersion();
// get geos capability
return mGeosAvailable;
}
/**
* Check to see if topology is available
*/
bool QgsPostgresConn::hasTopology()
{
// make sure info is up to date for the current connection
postgisVersion();
// get topology capability
return mTopologyAvailable;
}
/* Functions for determining available features in postGIS */
QString QgsPostgresConn::postgisVersion()
{
if ( mGotPostgisVersion )
return mPostgisVersionInfo;
mPostgresqlVersion = PQserverVersion( mConn );
QgsPostgresResult result = PQexec( "SELECT postgis_version()" );
if ( result.PQntuples() != 1 )
{
QgsMessageLog::logMessage( tr( "Retrieval of postgis version failed" ), tr( "PostGIS" ) );
return QString::null;
}
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::null;
}
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( "SELECT postgis_geos_version(),postgis_proj_version()" );
mGeosAvailable = result.PQntuples() == 1 && !result.PQgetisnull( 0, 0 );
mProjAvailable = result.PQntuples() == 1 && !result.PQgetisnull( 0, 1 );
QgsDebugMsg( QString( "geos:%1 proj:%2" )
.arg( mGeosAvailable ? result.PQgetvalue( 0, 0 ) : "none" )
.arg( 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( "GEOS" );
if ( geos.size() == 1 )
{
mGeosAvailable = ( geos[0].indexOf( "=1" ) > -1 );
}
QStringList gist = postgisParts.filter( "STATS" );
if ( gist.size() == 1 )
{
mGistAvailable = ( geos[0].indexOf( "=1" ) > -1 );
}
QStringList proj = postgisParts.filter( "PROJ" );
if ( proj.size() == 1 )
{
mProjAvailable = ( proj[0].indexOf( "=1" ) > -1 );
}
}
// checking for topology support
QgsDebugMsg( "Checking for topology support" );
mTopologyAvailable = false;
if ( mPostgisVersionMajor > 1 )
{
QgsPostgresResult result = PQexec( "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 ) == "t" )
{
mTopologyAvailable = true;
}
}
mGotPostgisVersion = true;
return mPostgisVersionInfo;
}
QString QgsPostgresConn::quotedIdentifier( QString ident )
{
ident.replace( '"', "\"\"" );
ident = ident.prepend( "\"" ).append( "\"" );
return ident;
}
QString QgsPostgresConn::quotedValue( QVariant value )
{
if ( value.isNull() )
return "NULL";
switch ( value.type() )
{
case QVariant::Int:
case QVariant::LongLong:
case QVariant::Double:
return value.toString();
default:
case QVariant::String:
QString v = value.toString();
v.replace( "'", "''" );
if ( v.contains( "\\" ) )
return v.replace( "\\", "\\\\" ).prepend( "E'" ).append( "'" );
else
return v.prepend( "'" ).append( "'" );
}
}
PGresult *QgsPostgresConn::PQexec( QString query, bool logError )
{
if ( PQstatus() != CONNECTION_OK )
{
if ( logError )
{
QgsMessageLog::logMessage( tr( "Connection error: %1 returned %2 [%3]" )
.arg( query ).arg( PQstatus() ).arg( PQerrorMessage() ),
tr( "PostGIS" ) );
}
else
{
QgsDebugMsg( QString( "Connection error: %1 returned %2 [%3]" )
.arg( query ).arg( PQstatus() ).arg( PQerrorMessage() ) );
}
return 0;
}
QgsDebugMsgLevel( QString( "Executing SQL: %1" ).arg( query ), 3 );
PGresult *res = ::PQexec( mConn, query.toUtf8() );
if ( res )
{
int errorStatus = PQresultStatus( res );
if ( errorStatus != PGRES_COMMAND_OK && errorStatus != PGRES_TUPLES_OK )
{
if ( logError )
{
QgsMessageLog::logMessage( tr( "Erroneous query: %1 returned %2 [%3]" )
.arg( query ).arg( errorStatus ).arg( PQresultErrorMessage( res ) ),
tr( "PostGIS" ) );
}
else
{
QgsDebugMsg( QString( "Not logged erroneous query: %1 returned %2 [%3]" )
.arg( query ).arg( errorStatus ).arg( PQresultErrorMessage( res ) ) );
}
}
}
else if ( logError )
{
QgsMessageLog::logMessage( tr( "Query failed: %1\nError: no result buffer" ).arg( query ), tr( "PostGIS" ) );
}
else
{
QgsDebugMsg( QString( "Not logged query failed: %1\nError: no result buffer" ).arg( query ) );
}
return res;
}
bool QgsPostgresConn::openCursor( QString cursorName, QString sql )
{
if ( mOpenCursors++ == 0 )
{
QgsDebugMsg( "Starting read-only transaction" );
PQexecNR( "BEGIN READ ONLY" );
}
QgsDebugMsgLevel( QString( "Binary cursor %1 for %2" ).arg( cursorName ).arg( sql ), 3 );
return PQexecNR( QString( "DECLARE %1 BINARY CURSOR FOR %2" ).arg( cursorName ).arg( sql ) );
}
bool QgsPostgresConn::closeCursor( QString cursorName )
{
if ( !PQexecNR( QString( "CLOSE %1" ).arg( cursorName ) ) )
return false;
if ( --mOpenCursors == 0 )
{
QgsDebugMsg( "Committing read-only transaction" );
PQexecNR( "COMMIT" );
}
return true;
}
QString QgsPostgresConn::uniqueCursorName()
{
return QString( "qgis_%1" ).arg( ++mNextCursorId );
}
bool QgsPostgresConn::PQexecNR( QString query, bool retry )
{
QgsPostgresResult res = PQexec( query, false );
ExecStatusType errorStatus = res.PQresultStatus();
if ( errorStatus == PGRES_COMMAND_OK )
return true;
QgsMessageLog::logMessage( tr( "Query: %1 returned %2 [%3]" )
.arg( query )
.arg( errorStatus )
.arg( res.PQresultErrorMessage() ),
tr( "PostGIS" ) );
if ( mOpenCursors )
{
QgsMessageLog::logMessage( tr( "%1 cursor states lost.\nSQL: %2\nResult: %3 (%4)" )
.arg( mOpenCursors ).arg( query ).arg( errorStatus )
.arg( res.PQresultErrorMessage() ), tr( "PostGIS" ) );
mOpenCursors = 0;
}
if ( PQstatus() == CONNECTION_OK )
{
PQexecNR( "ROLLBACK" );
}
else if ( retry )
{
QgsMessageLog::logMessage( tr( "resetting bad connection." ), tr( "PostGIS" ) );
::PQreset( mConn );
if ( PQstatus() == CONNECTION_OK )
{
if ( PQexecNR( query, false ) )
{
QgsMessageLog::logMessage( tr( "retry after reset succeeded." ), tr( "PostGIS" ) );
return true;
}
else
{
QgsMessageLog::logMessage( tr( "retry after reset failed again." ), tr( "PostGIS" ) );
return false;
}
}
else
{
QgsMessageLog::logMessage( tr( "connection still bad after reset." ), tr( "PostGIS" ) );
}
}
else
{
QgsMessageLog::logMessage( tr( "bad connection, not retrying." ), tr( "PostGIS" ) );
}
return false;
}
PGresult *QgsPostgresConn::PQgetResult()
{
return ::PQgetResult( mConn );
}
PGresult *QgsPostgresConn::PQprepare( QString stmtName, QString query, int nParams, const Oid *paramTypes )
{
return ::PQprepare( mConn, stmtName.toUtf8(), query.toUtf8(), nParams, paramTypes );
}
PGresult *QgsPostgresConn::PQexecPrepared( QString stmtName, const QStringList ¶ms )
{
const char **param = new const char *[ params.size()];
QList<QByteArray> qparam;
for ( int i = 0; i < params.size(); i++ )
{
qparam << params[i].toUtf8();
if ( params[i].isNull() )
param[i] = 0;
else
param[i] = qparam[i];
}
PGresult *res = ::PQexecPrepared( mConn, stmtName.toUtf8(), params.size(), param, NULL, NULL, 0 );
delete [] param;
return res;
}
void QgsPostgresConn::PQfinish()
{
Q_ASSERT( mConn );
::PQfinish( mConn );
mConn = 0;
}
int QgsPostgresConn::PQstatus()
{
Q_ASSERT( mConn );
return ::PQstatus( mConn );
}
QString QgsPostgresConn::PQerrorMessage()
{
Q_ASSERT( mConn );
return QString::fromUtf8( ::PQerrorMessage( mConn ) );
}
int QgsPostgresConn::PQsendQuery( QString query )
{
Q_ASSERT( mConn );
return ::PQsendQuery( mConn, query.toUtf8() );
}
qint64 QgsPostgresConn::getBinaryInt( QgsPostgresResult &queryResult, int row, int col )
{
quint64 oid;
char *p = PQgetvalue( queryResult.result(), row, col );
size_t s = PQgetlength( queryResult.result(), row, col );
#ifdef QGISDEBUG
if ( QgsLogger::debugLevel() >= 4 )
{
QString buf;
for ( size_t i = 0; i < s; i++ )
{
buf += QString( "%1 " ).arg( *( unsigned char * )( p + i ), 0, 16, QLatin1Char( ' ' ) );
}