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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 <QSettings>
// 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 )
{
QMap<QString, QgsPostgresConn *> &connections =
readonly ? QgsPostgresConn::sConnectionsRO : QgsPostgresConn::sConnectionsRW;
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 );
if ( conn->mRef == 0 )
{
delete conn;
return 0;
}
connections.insert( conninfo, conn );
return conn;
}
QgsPostgresConn::QgsPostgresConn( QString conninfo, bool readOnly )
: mRef( 1 )
, mOpenCursors( 0 )
, mConnInfo( conninfo )
, mGotPostgisVersion( false )
, mReadOnly( readOnly )
{
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();
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 );
}
if ( PQstatus() != CONNECTION_OK )
{
PQfinish();
QgsMessageLog::logMessage( tr( "Connection to database failed" ), 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='Quantum GIS'" );
}
/* 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;
QMap<QString, QgsPostgresConn *>& connections = mReadOnly ? sConnectionsRO : sConnectionsRW;
QString key = connections.key( this, QString::null );
Q_ASSERT( !key.isNull() );
connections.remove( key );
deleteLater();
}
QStringList QgsPostgresConn::pkCandidates( QString schemaName, QString viewName )
{
QStringList cols;
QString sql = QString( "SELECT attname FROM pg_attribute JOIN pg_type ON atttypid=pg_type.oid WHERE pg_type.typname IN ('int2','int4','int8','oid','serial','serial8') AND attrelid=regclass('%1.%2')" )
.arg( quotedIdentifier( schemaName ) )
.arg( quotedIdentifier( viewName ) );
QgsDebugMsg( sql );
QgsPostgresResult colRes = PQexec( sql );
if ( colRes.PQresultStatus() == PGRES_TUPLES_OK )
{
for ( int i = 0; i < colRes.PQntuples(); i++ )
{
QgsDebugMsg( colRes.PQgetvalue( i, 0 ) );
cols << colRes.PQgetvalue( i, 0 );
}
}
else
{
QgsMessageLog::logMessage( tr( "SQL:%1\nresult:%2\nerror:%3\n" ).arg( sql ).arg( colRes.PQresultStatus() ).arg( colRes.PQresultErrorMessage() ), tr( "PostGIS" ) );
}
return cols;
}
bool QgsPostgresConn::getTableInfo( bool searchGeometryColumnsOnly, bool searchPublicOnly, bool allowGeometrylessTables )
{
int nColumns = 0;
int nGTables = 0;
QgsPostgresResult result;
QgsPostgresLayerProperty layerProperty;
QgsDebugMsg( "Entering." );
mLayersSupported.clear();
// TODO: query topology.layer too !
for ( int i = 0; i < 2; i++ )
{
QString gtableName, columnName;
if ( i == 0 )
{
gtableName = "geometry_columns";
columnName = "f_geometry_column";
}
else if ( i == 1 )
{
gtableName = "geography_columns";
columnName = "f_geography_column";
}
// 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.
QString sql = QString( "SELECT "
"f_table_name,"
"f_table_schema,"
"%2,"
"upper(type),"
"srid,"
"pg_class.relkind"
" FROM "
"%1,pg_class,pg_namespace"
" WHERE relname=f_table_name"
" AND f_table_schema=nspname"
" AND 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')" // user has select privilege
).arg( gtableName ).arg( columnName );
if ( searchPublicOnly )
sql += " AND f_table_schema='public'";
sql += QString( " ORDER BY f_table_schema,f_table_name,%1" ).arg( columnName );
QgsDebugMsg( "getting table info: " + sql );
result = PQexec( sql, i == 0 );
if ( result.PQresultStatus() != PGRES_TUPLES_OK )
{
PQexecNR( "COMMIT" );
continue;
}
nGTables++;
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 srid = result.PQgetvalue( idx, 4 );
QString relkind = result.PQgetvalue( idx, 5 );
QgsDebugMsg( QString( "%1 : %2.%3.%4: %5 %6 %7" )
.arg( gtableName )
.arg( schemaName ).arg( tableName ).arg( column )
.arg( type )
.arg( srid )
.arg( relkind ) );
layerProperty.type = type;
layerProperty.schemaName = schemaName;
layerProperty.tableName = tableName;
layerProperty.geometryColName = column;
layerProperty.pkCols = relkind == "v" ? pkCandidates( schemaName, tableName ) : QStringList();
layerProperty.srid = srid;
layerProperty.sql = "";
layerProperty.isGeography = i == 1;
mLayersSupported << layerProperty;
nColumns++;
}
}
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 "
"pg_class.relname"
",pg_namespace.nspname"
",pg_attribute.attname"
",pg_class.relkind"
" FROM "
"pg_attribute,pg_class,pg_namespace"
" WHERE pg_namespace.oid=pg_class.relnamespace"
" AND pg_attribute.attrelid = pg_class.oid"
" AND ("
" EXISTS (SELECT * FROM pg_type WHERE pg_type.oid=pg_attribute.atttypid AND pg_type.typname IN ('geometry','geography','topogeometry'))"
" OR pg_attribute.atttypid IN (SELECT oid FROM pg_type a WHERE EXISTS (SELECT * FROM pg_type b WHERE a.typbasetype=b.oid AND b.typname IN ('geometry','geography','topogeometry')))"
")"
" AND has_schema_privilege( pg_namespace.nspname, 'usage' )"
" AND has_table_privilege( '\"' || pg_namespace.nspname || '\".\"' || pg_class.relname || '\"', 'select' )";
// user has select privilege
if ( searchPublicOnly )
sql += " AND pg_namespace.nspname='public'";
// skip columns of which we already derived information from the metadata tables
if ( nColumns > 0 )
{
sql += " AND (pg_namespace.nspname,pg_class.relname,pg_attribute.attname) NOT IN (SELECT f_table_schema,f_table_name,f_geometry_column FROM geometry_columns)";
if ( nGTables > 1 )
{
sql += " AND (pg_namespace.nspname,pg_class.relname,pg_attribute.attname) NOT IN (SELECT f_table_schema,f_table_name,f_geography_column FROM geography_columns)";
}
// TODO: handle this for the topogeometry case (once we lookup topology.layer)
}
sql += " AND pg_class.relkind IN ('v','r')"; // only from views and relations (tables)
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 table = result.PQgetvalue( i, 0 ); // relname
QString schema = result.PQgetvalue( i, 1 ); // nspname
QString column = result.PQgetvalue( i, 2 ); // attname
QString relkind = result.PQgetvalue( i, 3 ); // relation kind
QgsDebugMsg( QString( "%1.%2.%3: %4" ).arg( schema ).arg( table ).arg( column ).arg( relkind ) );
layerProperty.type = QString::null;
layerProperty.schemaName = schema;
layerProperty.tableName = table;
layerProperty.geometryColName = column;
layerProperty.pkCols = relkind == "v" ? pkCandidates( schema, table ) : QStringList();
layerProperty.sql = "";
layerProperty.isGeography = false; // TODO might be geography after all
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')";
// 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
QgsDebugMsg( QString( "%1.%2: %3" ).arg( schema ).arg( table ).arg( relkind ) );
layerProperty.type = QString::null;
layerProperty.schemaName = schema;
layerProperty.tableName = table;
layerProperty.geometryColName = QString::null;
layerProperty.pkCols = relkind == "v" ? pkCandidates( schema, table ) : QStringList();
layerProperty.srid = "";
layerProperty.sql = "";
layerProperty.isGeography = false;
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 count(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 )
{
mTopologyAvailable = true;
}
}
mGotPostgisVersion = true;
return mPostgisVersionInfo;
}
QString QgsPostgresConn::quotedIdentifier( QString ident, bool isGeography )
{
ident.replace( '"', "\"\"" );
ident = ident.prepend( "\"" ).append( "\"" );
if ( isGeography )
ident += "::geometry";
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( "'", "''" );
v.replace( "\\\"", "\\\\\"" );
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 ) );
}
else
{
QgsDebugMsg( tr( "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;
}
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
QString buf = "";
for ( size_t i = 0; i < s; i++ )
{
buf += QString( "%1 " ).arg( *( unsigned char * )( p + i ), 0, 16, QLatin1Char( ' ' ) );
}
QgsDebugMsgLevel( QString( "int in hex:%1" ).arg( buf ), 4 );
#endif
switch ( s )
{
case 2:
oid = *( quint16 * )p;
if ( mSwapEndian )
oid = ntohs( oid );
break;
case 6:
{
quint64 block = *( quint32 * ) p;
quint64 offset = *( quint16 * )( p + sizeof( quint32 ) );
if ( mSwapEndian )
{
block = ntohl( block );
offset = ntohs( offset );
}
oid = ( block << 16 ) + offset;
}
break;
case 8:
{
quint32 oid0 = *( quint32 * ) p;
quint32 oid1 = *( quint32 * )( p + sizeof( quint32 ) );
if ( mSwapEndian )
{
QgsDebugMsgLevel( QString( "swap oid0:%1 oid1:%2" ).arg( oid0 ).arg( oid1 ), 4 );
oid0 = ntohl( oid0 );
oid1 = ntohl( oid1 );
}
QgsDebugMsgLevel( QString( "oid0:%1 oid1:%2" ).arg( oid0 ).arg( oid1 ), 4 );
oid = oid0;
QgsDebugMsgLevel( QString( "oid:%1" ).arg( oid ), 4 );
oid <<= 32;
QgsDebugMsgLevel( QString( "oid:%1" ).arg( oid ), 4 );
oid |= oid1;
QgsDebugMsgLevel( QString( "oid:%1" ).arg( oid ), 4 );
}
break;
default:
QgsDebugMsg( QString( "unexpected size %1" ).arg( s ) );
case 4:
oid = *( quint32 * )p;
if ( mSwapEndian )
oid = ntohl( oid );
break;
}
return oid;
}
QString QgsPostgresConn::fieldExpression( const QgsField &fld )
{
const QString &type = fld.typeName();
if ( type == "money" )
{
return QString( "cash_out(%1)" ).arg( quotedIdentifier( fld.name() ) );
}
else if ( type.startsWith( "_" ) )
{
return QString( "array_out(%1)" ).arg( quotedIdentifier( fld.name() ) );
}
else if ( type == "bool" )
{
return QString( "boolout(%1)" ).arg( quotedIdentifier( fld.name() ) );
}
else if ( type == "geometry" )
{
return QString( "%1(%2)" )
.arg( majorVersion() < 2 ? "asewkt" : "st_asewkt" )
.arg( quotedIdentifier( fld.name() ) );
}
else if ( type == "geography" )
{
return QString( "st_astext(%1)" ).arg( quotedIdentifier( fld.name() ) );
}
else
{
return quotedIdentifier( fld.name() ) + "::text";
}
}
void QgsPostgresConn::deduceEndian()
{
// need to store the PostgreSQL endian format used in binary cursors
// since it appears that starting with
// version 7.4, binary cursors return data in XDR whereas previous versions
// return data in the endian of the server
QgsPostgresResult res = PQexec( "select regclass('pg_class')::oid" );
QString oidValue = res.PQgetvalue( 0, 0 );
QgsDebugMsg( "Creating binary cursor" );
// get the same value using a binary cursor
openCursor( "oidcursor", "select regclass('pg_class')::oid" );