/
qgsoracleprovider.cpp
3028 lines (2548 loc) · 86.3 KB
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qgsoracleprovider.cpp
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/***************************************************************************
qgsoracleprovider.cpp - QGIS data provider for Oracle layers
-------------------
begin : August 2012
copyright : (C) 2012 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 "qgsfeature.h"
#include "qgsfield.h"
#include "qgsgeometry.h"
#include "qgsmessageoutput.h"
#include "qgsmessagelog.h"
#include "qgsrectangle.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsvectorlayerimport.h"
#include "qgslogger.h"
#include "qgsprovidercountcalcevent.h"
#include "qgsproviderextentcalcevent.h"
#include "qgsoracleprovider.h"
#include "qgsoracletablemodel.h"
#include "qgsoraclesourceselect.h"
#include "qgsoracledataitems.h"
#include "qgsoraclefeatureiterator.h"
#include <QSqlRecord>
#include <QSqlField>
#include "ocispatial/wkbptr.h"
const QString ORACLE_KEY = "oracle";
const QString ORACLE_DESCRIPTION = "Oracle data provider";
QgsOracleProvider::QgsOracleProvider( QString const & uri )
: QgsVectorDataProvider( uri )
, mValid( false )
, mPrimaryKeyType( pktUnknown )
, mDetectedGeomType( QGis::WKBUnknown )
, mRequestedGeomType( QGis::WKBUnknown )
, mSpatialIndex( QString::null )
, mShared( new QgsOracleSharedData )
{
static int geomMetaType = -1;
if ( geomMetaType < 0 )
geomMetaType = qRegisterMetaType<QOCISpatialGeometry>();
QgsDebugMsg( QString( "URI: %1 " ).arg( uri ) );
mUri = QgsDataSourceURI( uri );
// populate members from the uri structure
mOwnerName = mUri.schema();
mTableName = mUri.table();
mGeometryColumn = mUri.geometryColumn();
mSqlWhereClause = mUri.sql();
mSrid = mUri.srid().toInt();
mRequestedGeomType = mUri.wkbType();
mUseEstimatedMetadata = mUri.useEstimatedMetadata();
mConnection = QgsOracleConn::connectDb( mUri.connectionInfo() );
if ( !mConnection )
{
return;
}
if ( mOwnerName.isEmpty() && mTableName.startsWith( "(" ) && mTableName.endsWith( ")" ) )
{
mIsQuery = true;
mQuery = mTableName;
mTableName = "";
}
else
{
mIsQuery = false;
if ( mOwnerName.isEmpty() )
{
mOwnerName = mConnection->currentUser();
}
if ( !mOwnerName.isEmpty() )
{
mQuery += quotedIdentifier( mOwnerName ) + ".";
}
if ( !mTableName.isEmpty() )
{
mQuery += quotedIdentifier( mTableName );
}
}
QgsDebugMsg( QString( "Connection info is %1" ).arg( mUri.connectionInfo() ) );
QgsDebugMsg( QString( "Geometry column is: %1" ).arg( mGeometryColumn ) );
QgsDebugMsg( QString( "Owner is: %1" ).arg( mOwnerName ) );
QgsDebugMsg( QString( "Table name is: %1" ).arg( mTableName ) );
QgsDebugMsg( QString( "Query is: %1" ).arg( mQuery ) );
QgsDebugMsg( QString( "Where clause is: %1" ).arg( mSqlWhereClause ) );
QgsDebugMsg( QString( "SRID is: %1" ).arg( mSrid ) );
// no table/query passed, the provider could be used to get tables
if ( mQuery.isEmpty() )
{
return;
}
if ( !hasSufficientPermsAndCapabilities() )
{
return;
}
// get geometry details
if ( !getGeometryDetails() ) // gets srid, geometry and data type
{
// the table is not a geometry table
mValid = false;
disconnectDb();
return;
}
mLayerExtent.setMinimal();
mFeaturesCounted = -1;
// set the primary key
if ( !determinePrimaryKey() )
{
mValid = false;
disconnectDb();
return;
}
//fill type names into sets
mNativeTypes
// integer types
<< QgsVectorDataProvider::NativeType( tr( "Whole number" ), "number(10,0)", QVariant::Int )
<< QgsVectorDataProvider::NativeType( tr( "Whole big number" ), "number(20,0)", QVariant::LongLong )
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (numeric)" ), "number", QVariant::Double, 1, 38, 0, 38 )
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (decimal)" ), "double precision", QVariant::Double )
// floating point
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (real)" ), "binary_float", QVariant::Double )
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (double)" ), "binary_double", QVariant::Double )
// string types
<< QgsVectorDataProvider::NativeType( tr( "Text, fixed length (char)" ), "CHAR", QVariant::String, 1, 255 )
<< QgsVectorDataProvider::NativeType( tr( "Text, limited variable length (varchar2)" ), "VARCHAR2", QVariant::String, 1, 255 )
<< QgsVectorDataProvider::NativeType( tr( "Text, unlimited length (long)" ), "LONG", QVariant::String )
;
QString key;
switch ( mPrimaryKeyType )
{
case pktRowId:
key = "ROWID";
break;
case pktInt:
case pktFidMap:
{
Q_ASSERT( mPrimaryKeyType != pktInt || mPrimaryKeyAttrs.size() == 1 );
QString delim;
foreach ( int idx, mPrimaryKeyAttrs )
{
Q_ASSERT( idx >= 0 && idx < mAttributeFields.size() );
key += delim + mAttributeFields[ idx ].name();
delim = ",";
}
}
break;
case pktUnknown:
mValid = false;
break;
}
if ( mValid )
{
mUri.setKeyColumn( key );
setDataSourceUri( mUri.uri() );
}
else
{
disconnectDb();
}
}
QgsOracleProvider::~QgsOracleProvider()
{
QgsDebugMsg( "deconstructing." );
disconnectDb();
}
QgsAbstractFeatureSource *QgsOracleProvider::featureSource() const
{
return new QgsOracleFeatureSource( this );
}
void QgsOracleProvider::disconnectDb()
{
if ( mConnection )
mConnection->disconnect();
mConnection = 0;
}
bool QgsOracleProvider::exec( QSqlQuery &qry, QString sql )
{
QgsDebugMsgLevel( QString( "SQL: %1" ).arg( sql ), 4 );
qry.setForwardOnly( true );
bool res = qry.exec( sql );
if ( !res )
{
QgsDebugMsg( QString( "SQL: %1\nERROR: %2" )
.arg( qry.lastQuery() )
.arg( qry.lastError().text() ) );
}
return res;
}
QString QgsOracleProvider::storageType() const
{
return "Oracle database with locator/spatial 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();
}
QString QgsOracleProvider::pkParamWhereClause() const
{
QString whereClause;
switch ( mPrimaryKeyType )
{
case pktInt:
case pktFidMap:
{
Q_ASSERT( mPrimaryKeyAttrs.size() >= 1 );
QString delim = "";
for ( int i = 0; i < mPrimaryKeyAttrs.size(); i++ )
{
int idx = mPrimaryKeyAttrs[i];
const QgsField &fld = field( idx );
whereClause += delim + QString( "%1=?" ).arg( mConnection->fieldExpression( fld ) );
delim = " AND ";
}
}
break;
case pktRowId:
return "ROWID=?";
break;
case pktUnknown:
Q_ASSERT( !"FAILURE: Primary key unknown" );
whereClause = "NULL IS NOT NULL";
break;
}
if ( !mSqlWhereClause.isEmpty() )
{
if ( !whereClause.isEmpty() )
whereClause += " AND ";
whereClause += "(" + mSqlWhereClause + ")";
}
return whereClause;
}
void QgsOracleProvider::appendPkParams( QgsFeatureId fid, QSqlQuery &qry ) const
{
switch ( mPrimaryKeyType )
{
case pktInt:
QgsDebugMsgLevel( QString( "addBindValue pk %1" ).arg( FID_TO_STRING( fid ) ), 4 );
qry.addBindValue( FID_TO_STRING( fid ) );
break;
case pktRowId:
case pktFidMap:
{
QVariant pkValsVariant = mShared->lookupKey( fid );
if ( !pkValsVariant.isNull() )
{
foreach ( const QVariant &v, pkValsVariant.toList() )
{
QgsDebugMsgLevel( QString( "addBindValue pk %1" ).arg( FID_TO_STRING( fid ) ), 4 );
qry.addBindValue( v );
}
}
else
{
QgsDebugMsg( QString( "key values for fid %1 not found." ).arg( fid ) );
for ( int i = 0; i < mPrimaryKeyAttrs.size(); i++ )
{
QgsDebugMsgLevel( QString( "addBindValue pk NULL" ).arg( fid ), 4 );
qry.addBindValue( QVariant() );
}
}
break;
}
break;
case pktUnknown:
QgsDebugMsg( "Unknown key type" );
break;
}
}
QString QgsOracleUtils::whereClause( QgsFeatureId featureId, const QgsFields& fields, QgsOraclePrimaryKeyType primaryKeyType, const QList<int>& primaryKeyAttrs, QSharedPointer<QgsOracleSharedData> sharedData )
{
QString whereClause;
switch ( primaryKeyType )
{
case pktInt:
Q_ASSERT( primaryKeyAttrs.size() == 1 );
whereClause = QString( "%1=%2" ).arg( QgsOracleConn::quotedIdentifier( fields[ primaryKeyAttrs[0] ].name() ) ).arg( featureId );
break;
case pktRowId:
case pktFidMap:
{
QVariant pkValsVariant = sharedData->lookupKey( featureId );
if ( !pkValsVariant.isNull() )
{
QList<QVariant> pkVals = pkValsVariant.toList();
if ( primaryKeyType == pktFidMap )
{
Q_ASSERT( pkVals.size() == primaryKeyAttrs.size() );
QString delim = "";
for ( int i = 0; i < primaryKeyAttrs.size(); i++ )
{
int idx = primaryKeyAttrs[i];
const QgsField &fld = fields[ idx ];
whereClause += delim + QString( "%1=%2" ).arg( QgsOracleConn::fieldExpression( fld ) ).arg( QgsOracleConn::quotedValue( pkVals[i], fld.type() ) );
delim = " AND ";
}
}
else
{
whereClause += QString( "ROWID=%1" ).arg( QgsOracleConn::quotedValue( pkVals[0].toString() ) );
}
}
else
{
QgsDebugMsg( QString( "FAILURE: Key values for feature %1 not found." ).arg( featureId ) );
whereClause = "NULL IS NOT NULL";
}
}
break;
case pktUnknown:
Q_ASSERT( !"FAILURE: Primary key unknown" );
whereClause = "NULL IS NOT NULL";
break;
}
return whereClause;
}
QString QgsOracleUtils::whereClause( QgsFeatureIds featureIds, const QgsFields &fields, QgsOraclePrimaryKeyType primaryKeyType, const QList<int> &primaryKeyAttrs, QSharedPointer<QgsOracleSharedData> sharedData )
{
QStringList whereClauses;
foreach ( const QgsFeatureId featureId, featureIds )
{
whereClauses << whereClause( featureId, fields, primaryKeyType, primaryKeyAttrs, sharedData );
}
return whereClauses.join( " AND " );
}
QString QgsOracleProvider::whereClause( QgsFeatureId featureId ) const
{
return QgsOracleUtils::whereClause( featureId, mAttributeFields, mPrimaryKeyType, mPrimaryKeyAttrs, mShared );
}
void QgsOracleProvider::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 QgsOracleProvider::geometryType() const
{
return mRequestedGeomType != QGis::WKBUnknown ? mRequestedGeomType : mDetectedGeomType;
}
const QgsField &QgsOracleProvider::field( int index ) const
{
if ( index < 0 || index >= mAttributeFields.size() )
{
QgsMessageLog::logMessage( tr( "FAILURE: Field %1 not found." ).arg( index ), tr( "Oracle" ) );
throw OracleFieldNotFound();
}
return mAttributeFields[ index ];
}
QgsFeatureIterator QgsOracleProvider::getFeatures( const QgsFeatureRequest& request )
{
if ( !mValid )
{
QgsMessageLog::logMessage( tr( "Read attempt on an invalid oracle data source" ), tr( "Oracle" ) );
return QgsFeatureIterator();
}
return QgsFeatureIterator( new QgsOracleFeatureIterator( new QgsOracleFeatureSource( this ), true, request ) );
}
/**
* Return the number of fields
*/
uint QgsOracleProvider::fieldCount() const
{
return mAttributeFields.size();
}
const QgsFields &QgsOracleProvider::fields() const
{
return mAttributeFields;
}
QString QgsOracleProvider::dataComment() const
{
return mDataComment;
}
bool QgsOracleProvider::loadFields()
{
mAttributeFields.clear();
mDefaultValues.clear();
QSqlQuery qry( *mConnection );
QMap<QString, QString> comments;
QMap<QString, QString> types;
QMap<QString, QVariant> defvalues;
if ( !mIsQuery )
{
QgsDebugMsg( QString( "Loading fields for table %1" ).arg( mTableName ) );
if ( exec( qry, QString( "SELECT comments FROM all_tab_comments WHERE owner=%1 AND table_name=%2" )
.arg( quotedValue( mOwnerName ) )
.arg( quotedValue( mTableName ) ) ) )
{
if ( qry.next() )
mDataComment = qry.value( 0 ).toString();
else if ( exec( qry, QString( "SELECT comments FROM all_mview_comments WHERE owner=%1 AND mview_name=%2" )
.arg( quotedValue( mOwnerName ) )
.arg( quotedValue( mTableName ) ) ) )
{
if ( qry.next() )
mDataComment = qry.value( 0 ).toString();
}
}
else
{
QgsMessageLog::logMessage( tr( "Loading comment for table %1.%2 failed [%3]" )
.arg( mOwnerName )
.arg( mTableName )
.arg( qry.lastError().text() ),
tr( "Oracle" ) );
}
qry.finish();
if ( exec( qry, QString( "SELECT column_name,comments FROM all_col_comments t WHERE t.owner=%1 AND t.table_name=%2 AND t.column_name<>%3" )
.arg( quotedValue( mOwnerName ) )
.arg( quotedValue( mTableName ) )
.arg( quotedValue( mGeometryColumn ) ) ) )
{
while ( qry.next() )
{
comments.insert( qry.value( 0 ).toString(), qry.value( 1 ).toString() );
}
}
else
{
QgsMessageLog::logMessage( tr( "Loading comment for columns of table %1.%2 failed [%3]" ).arg( mOwnerName ).arg( mTableName ).arg( qry.lastError().text() ), tr( "Oracle" ) );
}
qry.finish();
if ( exec( qry, QString( "SELECT"
" t.column_name"
",CASE WHEN t.data_type_owner IS NULL THEN t.data_type ELSE t.data_type_owner||'.'||t.data_type END"
",t.data_precision"
",t.data_scale"
",t.char_length"
",t.char_used"
",t.data_default"
" FROM all_tab_columns t"
" WHERE t.owner=%1 AND t.table_name=%2%3"
" ORDER BY t.column_id" )
.arg( quotedValue( mOwnerName ) )
.arg( quotedValue( mTableName ) )
.arg( mGeometryColumn.isEmpty() ? "" : QString( " AND t.column_name<>%1 " ).arg( quotedValue( mGeometryColumn ) ) )
) )
{
while ( qry.next() )
{
QString name = qry.value( 0 ).toString();
QString type = qry.value( 1 ).toString();
int prec = qry.value( 2 ).toInt();
int scale = qry.value( 3 ).toInt();
int clength = qry.value( 4 ).toInt();
bool cused = qry.value( 5 ).toString() == "C";
QVariant defValue = qry.value( 6 );
if ( type == "CHAR" || type == "VARCHAR2" || type == "VARCHAR" )
{
types.insert( name, QString( "%1(%2 %3)" ).arg( type ).arg( clength ).arg( cused ? "CHAR" : "BYTE" ) );
}
else if ( type == "NCHAR" || type == "NVARCHAR2" || type == "NVARCHAR" )
{
types.insert( name, QString( "%1(%2)" ).arg( type ).arg( clength ) );
}
else if ( type == "NUMBER" )
{
if ( scale == 0 )
{
types.insert( name, QString( "%1(%2)" ).arg( type ).arg( prec ) );
}
else
{
types.insert( name, QString( "%1(%2,%3)" ).arg( type ).arg( prec ).arg( scale ) );
}
}
else if ( type == "MDSYS.SDO_GEOMETRY" )
{
if ( !mConnection->hasSpatial() )
{
QgsMessageLog::logMessage( tr( "Other spatial field %1.%2.%3 ignored" ).arg( mOwnerName ).arg( mTableName ).arg( name ), tr( "Oracle" ) );
continue;
}
}
else
{
types.insert( name, type );
}
defvalues.insert( name, defValue );
}
}
else
{
QgsMessageLog::logMessage( tr( "Loading field types for table %1.%2 failed [%3]" )
.arg( mOwnerName )
.arg( mTableName )
.arg( qry.lastError().text() ),
tr( "Oracle" ) );
}
if ( !mGeometryColumn.isEmpty() )
{
if ( exec( qry, QString( "SELECT i.index_name,i.domidx_opstatus"
" FROM all_indexes i"
" JOIN all_ind_columns c ON i.owner=c.index_owner AND i.index_name=c.index_name AND c.column_name=%3"
" WHERE i.table_owner=%1 AND i.table_name=%2 AND i.ityp_owner='MDSYS' AND i.ityp_name='SPATIAL_INDEX'" )
.arg( quotedValue( mOwnerName ) )
.arg( quotedValue( mTableName ) )
.arg( quotedValue( mGeometryColumn ) ) ) )
{
if ( qry.next() )
{
mSpatialIndex = qry.value( 0 ).toString();
if ( qry.value( 1 ).toString() != "VALID" )
{
QgsMessageLog::logMessage( tr( "Invalid spatial index %1 on column %2.%3.%4 found - expect poor performance." )
.arg( mSpatialIndex )
.arg( mOwnerName )
.arg( mTableName )
.arg( mGeometryColumn ),
tr( "Oracle" ) );
mSpatialIndex = QString::null;
}
else
{
QgsDebugMsg( QString( "Valid spatial index %1 found" ).arg( mSpatialIndex ) );
}
}
else
{
QgsMessageLog::logMessage( tr( "No spatial index on column %1.%2.%3 found - expect poor performance." )
.arg( mOwnerName )
.arg( mTableName )
.arg( mGeometryColumn ),
tr( "Oracle" ) );
}
}
else
{
QgsMessageLog::logMessage( tr( "Probing for spatial index on column %1.%2.%3 failed [%4]" )
.arg( mOwnerName )
.arg( mTableName )
.arg( mGeometryColumn )
.arg( qry.lastError().text() ),
tr( "Oracle" ) );
}
}
qry.finish();
mEnabledCapabilities |= QgsVectorDataProvider::CreateSpatialIndex;
}
if ( !exec( qry, QString( "SELECT * FROM %1 WHERE 1=0" ).arg( mQuery ) ) )
{
QgsMessageLog::logMessage( tr( "Retrieving fields from '%1' failed [%2]" ).arg( mQuery ).arg( qry.lastError().text() ), tr( "Oracle" ) );
return false;
}
QSqlRecord record = qry.record();
for ( int i = 0; i < record.count(); i++ )
{
QSqlField field = record.field( i );
if ( field.name() == mGeometryColumn )
continue;
if ( !mIsQuery && !types.contains( field.name() ) )
continue;
mAttributeFields.append( QgsField( field.name(), field.type(), types.value( field.name() ), field.length(), field.precision(), comments.value( field.name() ) ) );
mDefaultValues.append( defvalues.value( field.name(), QVariant() ) );
}
return true;
}
bool QgsOracleProvider::hasSufficientPermsAndCapabilities()
{
QgsDebugMsg( "Checking for permissions on the relation" );
mEnabledCapabilities = QgsVectorDataProvider::SelectAtId | QgsVectorDataProvider::SelectGeometryAtId;
QSqlQuery qry( *mConnection );
if ( !mIsQuery )
{
if ( mConnection->currentUser() == mOwnerName )
{
// full set of privileges for the owner
mEnabledCapabilities |= QgsVectorDataProvider::DeleteFeatures
| QgsVectorDataProvider::ChangeAttributeValues
| QgsVectorDataProvider::AddFeatures
| QgsVectorDataProvider::AddAttributes
| QgsVectorDataProvider::DeleteAttributes
| QgsVectorDataProvider::ChangeGeometries
;
}
else if ( exec( qry, QString( "SELECT privilege FROM all_tab_privs WHERE table_schema=%1 AND table_name=%2 AND privilege IN ('DELETE','UPDATE','INSERT','ALTER TABLE')" )
.arg( quotedValue( mOwnerName ) ).arg( quotedValue( mTableName ) ) ) )
{
// check grants
while ( qry.next() )
{
QString priv = qry.value( 0 ).toString();
if ( priv == "DELETE" )
{
mEnabledCapabilities |= QgsVectorDataProvider::DeleteFeatures;
}
else if ( priv == "UPDATE" )
{
mEnabledCapabilities |= QgsVectorDataProvider::ChangeAttributeValues;
}
else if ( priv == "INSERT" )
{
mEnabledCapabilities |= QgsVectorDataProvider::AddFeatures;
}
else if ( priv == "ALTER TABLE" )
{
mEnabledCapabilities |= QgsVectorDataProvider::AddAttributes | QgsVectorDataProvider::DeleteAttributes;
}
}
if ( !mGeometryColumn.isNull() )
{
if ( exec( qry, QString( "SELECT 1 FROM all_col_privs WHERE table_schema=%1 AND table_name=%2 AND column_name=%3 AND privilege='UPDATE'" )
.arg( quotedValue( mOwnerName ) )
.arg( quotedValue( mTableName ) )
.arg( quotedValue( mGeometryColumn ) ) ) )
{
if ( qry.next() )
mEnabledCapabilities |= QgsVectorDataProvider::ChangeGeometries;
}
else
{
QgsMessageLog::logMessage( tr( "Unable to determine geometry column access privileges for column %1.%2.\nThe error message from the database was:\n%3.\nSQL: %4" )
.arg( mQuery )
.arg( mGeometryColumn )
.arg( qry.lastError().text() )
.arg( qry.lastQuery() ),
tr( "Oracle" ) );
}
}
}
else
{
QgsMessageLog::logMessage( tr( "Unable to determine table access privileges for the table %1.\nThe error message from the database was:\n%2.\nSQL: %3" )
.arg( mQuery )
.arg( qry.lastError().text() )
.arg( qry.lastQuery() ),
tr( "Oracle" ) );
}
}
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( "Oracle" ) );
return false;
}
if ( !exec( qry, QString( "SELECT * FROM %1 WHERE 1=0" ).arg( mQuery ) ) )
{
QgsMessageLog::logMessage( tr( "Unable to execute the query.\nThe error message from the database was:\n%1.\nSQL: %2" )
.arg( qry.lastError().text() )
.arg( qry.lastQuery() ), tr( "Oracle" ) );
return false;
}
}
qry.finish();
return true;
}
bool QgsOracleProvider::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.
QSqlQuery qry( *mConnection );
if ( !mIsQuery )
{
if ( !exec( qry, QString( "SELECT column_name"
" FROM all_ind_columns a"
" JOIN all_constraints b ON a.index_name=constraint_name AND a.index_owner=b.owner"
" WHERE b.constraint_type='P' AND b.owner=%1 AND b.table_name=%2" )
.arg( quotedValue( mOwnerName ) ).arg( quotedValue( mTableName ) ) ) )
{
QgsMessageLog::logMessage( tr( "Unable to execute the query.\nThe error message from the database was:\n%1.\nSQL: %2" )
.arg( qry.lastError().text() )
.arg( qry.lastQuery() ), tr( "Oracle" ) );
return false;
}
bool isInt = true;
while ( qry.next() )
{
QString name = qry.value( 0 ).toString();
int idx = mAttributeFields.indexFromName( name );
if ( idx < 0 )
{
QgsMessageLog::logMessage( tr( "Primary key field %1 not found in %2" ).arg( name ).arg( mQuery ), tr( "Oracle" ) );
return false;
}
const QgsField &fld = mAttributeFields.at( idx );
if ( isInt &&
fld.type() != QVariant::Int &&
fld.type() != QVariant::LongLong &&
!( fld.type() == QVariant::Double && fld.precision() == 0 ) )
isInt = false;
mPrimaryKeyAttrs << idx;
}
if ( mPrimaryKeyAttrs.size() > 0 )
{
mPrimaryKeyType = ( mPrimaryKeyAttrs.size() == 1 && isInt ) ? pktInt : pktFidMap;
}
else if ( !exec( qry, QString( "SELECT 1 FROM all_tables WHERE owner=%1 AND table_name=%2" ).arg( quotedValue( mOwnerName ) ).arg( quotedValue( mTableName ) ) ) )
{
QgsMessageLog::logMessage( tr( "Unable to execute the query.\nThe error message from the database was:\n%1.\nSQL: %2" )
.arg( qry.lastError().text() )
.arg( qry.lastQuery() ), tr( "Oracle" ) );
}
else if ( qry.next() )
{
// is table
mPrimaryKeyType = pktRowId;
}
else
{
QString primaryKey = mUri.keyColumn();
mPrimaryKeyType = pktUnknown;
if ( !primaryKey.isEmpty() )
{
int idx = fieldNameIndex( primaryKey );
if ( idx >= 0 )
{
const QgsField &fld = mAttributeFields.at( idx );
if ( mUseEstimatedMetadata || uniqueData( mQuery, primaryKey ) )
{
mPrimaryKeyType = ( fld.type() == QVariant::Int || fld.type() == QVariant::LongLong || ( fld.type() == QVariant::Double && fld.precision() == 0 ) ) ? pktInt : pktFidMap;
mPrimaryKeyAttrs << idx;
}
else
{
QgsMessageLog::logMessage( tr( "Primary key field '%1' for view not unique." ).arg( primaryKey ), tr( "Oracle" ) );
}
}
else
{
QgsMessageLog::logMessage( tr( "Key field '%1' for view not found." ).arg( primaryKey ), tr( "Oracle" ) );
}
}
else
{
QgsMessageLog::logMessage( tr( "No key field for view given." ), tr( "Oracle" ) );
}
}
}
else
{
QString primaryKey = mUri.keyColumn();
int idx = fieldNameIndex( mUri.keyColumn() );
if ( idx >= 0 && (
mAttributeFields[idx].type() == QVariant::Int ||
mAttributeFields[idx].type() == QVariant::LongLong ||
mAttributeFields[idx].type() == QVariant::Double
) )
{
if ( mUseEstimatedMetadata || uniqueData( mQuery, primaryKey ) )
{
mPrimaryKeyType = pktInt;
mPrimaryKeyAttrs << idx;
}
}
else
{
QgsMessageLog::logMessage( tr( "No key field for query given." ), tr( "Oracle" ) );
mPrimaryKeyType = pktUnknown;
}
}
qry.finish();
mValid = mPrimaryKeyType != pktUnknown;
return mValid;
}
bool QgsOracleProvider::uniqueData( QString query, QString colName )
{
Q_UNUSED( query );
// Check to see if the given column contains unique data
QSqlQuery qry( *mConnection );
QString table = mQuery;
if ( !mSqlWhereClause.isEmpty() )
{
table += " WHERE " + mSqlWhereClause;
}
QString sql = QString( "SELECT (SELECT count(distinct %1) FROM %2)-(SELECT count(%1) FROM %2) FROM dual" )
.arg( quotedIdentifier( colName ) )
.arg( mQuery );
if ( !exec( qry, sql ) || !qry.next() )
{
QgsMessageLog::logMessage( tr( "Unable to execute the query.\nThe error message from the database was:\n%1.\nSQL: %2" )
.arg( qry.lastError().text() )
.arg( qry.lastQuery() ), tr( "Oracle" ) );
return false;
}
return qry.value( 0 ).toInt() == 0;
}
// Returns the minimum value of an attribute
QVariant QgsOracleProvider::minimumValue( int index )
{
try
{
// get the field name
const QgsField &fld = field( index );
QString sql = QString( "SELECT min(%1) FROM %2" )
.arg( quotedIdentifier( fld.name() ) )
.arg( mQuery );