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qgsoracleprovider.cpp
3622 lines (3056 loc) · 107 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 "qgsfields.h"
#include "qgsgeometry.h"
#include "qgsmessageoutput.h"
#include "qgsmessagelog.h"
#include "qgsrectangle.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsvectorlayerexporter.h"
#include "qgslogger.h"
#include "qgsoracleprovider.h"
#include "qgsoracletablemodel.h"
#include "qgsoracledataitems.h"
#include "qgsoraclefeatureiterator.h"
#include "qgsoracleconnpool.h"
#ifdef HAVE_GUI
#include "qgsoraclesourceselect.h"
#include "qgssourceselectprovider.h"
#endif
#include <QSqlRecord>
#include <QSqlField>
#include <QMessageBox>
#include "ocispatial/wkbptr.h"
const QString ORACLE_KEY = "oracle";
const QString ORACLE_DESCRIPTION = "Oracle data provider";
QgsOracleProvider::QgsOracleProvider( QString const &uri, const ProviderOptions &options )
: QgsVectorDataProvider( uri, options )
, mValid( false )
, mIsQuery( false )
, mPrimaryKeyType( PktUnknown )
, mFeaturesCounted( -1 )
, mDetectedGeomType( QgsWkbTypes::Unknown )
, mRequestedGeomType( QgsWkbTypes::Unknown )
, mHasSpatialIndex( false )
, mSpatialIndexName( QString() )
, mShared( new QgsOracleSharedData )
{
static int geomMetaType = -1;
if ( geomMetaType < 0 )
geomMetaType = qRegisterMetaType<QOCISpatialGeometry>();
QgsDebugMsg( QStringLiteral( "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();
mIncludeGeoAttributes = mUri.hasParam( "includegeoattributes" ) ? mUri.param( "includegeoattributes" ) == "true" : false;
mConnection = QgsOracleConn::connectDb( mUri );
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( QStringLiteral( "Connection info is %1" ).arg( mUri.connectionInfo() ) );
QgsDebugMsg( QStringLiteral( "Geometry column is: %1" ).arg( mGeometryColumn ) );
QgsDebugMsg( QStringLiteral( "Owner is: %1" ).arg( mOwnerName ) );
QgsDebugMsg( QStringLiteral( "Table name is: %1" ).arg( mTableName ) );
QgsDebugMsg( QStringLiteral( "Query is: %1" ).arg( mQuery ) );
QgsDebugMsg( QStringLiteral( "Where clause is: %1" ).arg( mSqlWhereClause ) );
QgsDebugMsg( QStringLiteral( "SRID is: %1" ).arg( mSrid ) );
QgsDebugMsg( QStringLiteral( "Using estimated metadata: %1" ).arg( mUseEstimatedMetadata ? "yes" : "no" ) );
// 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();
// set the primary key
if ( !determinePrimaryKey() )
{
mValid = false;
disconnectDb();
return;
}
//fill type names into sets
setNativeTypes( QList<NativeType>()
// 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 )
// date type
<< QgsVectorDataProvider::NativeType( tr( "Date" ), "DATE", QVariant::Date, 38, 38, 0, 0 )
<< QgsVectorDataProvider::NativeType( tr( "Date & Time" ), "TIMESTAMP(6)", QVariant::DateTime, 38, 38, 6, 6 )
);
QString key;
switch ( mPrimaryKeyType )
{
case PktRowId:
key = "ROWID";
break;
case PktInt:
case PktFidMap:
{
Q_ASSERT( mPrimaryKeyType != PktInt || mPrimaryKeyAttrs.size() == 1 );
QString delim;
Q_FOREACH ( int idx, mPrimaryKeyAttrs )
{
Q_ASSERT( idx >= 0 && idx < mAttributeFields.size() );
key += delim + mAttributeFields.at( idx ).name();
delim = ",";
}
}
break;
case PktUnknown:
mValid = false;
break;
}
if ( mValid )
{
mUri.setKeyColumn( key );
setDataSourceUri( mUri.uri() );
}
else
{
disconnectDb();
}
}
QgsOracleProvider::~QgsOracleProvider()
{
QgsDebugMsg( QStringLiteral( "deconstructing." ) );
disconnectDb();
}
QString QgsOracleProvider::getWorkspace() const
{
return mUri.param( "dbworkspace" );
}
void QgsOracleProvider::setWorkspace( const QString &workspace )
{
QgsDataSourceUri prevUri( mUri );
disconnectDb();
if ( workspace.isEmpty() )
mUri.removeParam( "dbworkspace" );
else
mUri.setParam( "dbworkspace", workspace );
mConnection = QgsOracleConn::connectDb( mUri );
if ( !mConnection )
{
mUri = prevUri;
QgsDebugMsg( QStringLiteral( "restoring previous uri:%1" ).arg( mUri.uri() ) );
mConnection = QgsOracleConn::connectDb( mUri );
}
else
{
setDataSourceUri( mUri.uri() );
}
}
QgsAbstractFeatureSource *QgsOracleProvider::featureSource() const
{
return new QgsOracleFeatureSource( this );
}
void QgsOracleProvider::disconnectDb()
{
if ( mConnection )
mConnection->disconnect();
mConnection = nullptr;
}
bool QgsOracleProvider::exec( QSqlQuery &qry, QString sql, const QVariantList &args )
{
QgsDebugMsgLevel( QStringLiteral( "SQL: %1" ).arg( sql ), 4 );
qry.setForwardOnly( true );
bool res = qry.prepare( sql );
if ( res )
{
for ( const auto &arg : args )
{
QgsDebugMsgLevel( QStringLiteral( " ARG: %1 [%2]" ).arg( arg.toString() ).arg( arg.typeName() ), 4 );
qry.addBindValue( arg );
}
res = qry.exec();
}
if ( !res )
{
QgsDebugMsg( QStringLiteral( "SQL: %1\nERROR: %2" )
.arg( qry.lastQuery() )
.arg( qry.lastError().text() ) );
}
return res;
}
QString QgsOracleProvider::storageType() const
{
return "Oracle database with locator/spatial extension";
}
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];
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( QStringLiteral( "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() )
{
Q_FOREACH ( const QVariant &v, pkValsVariant.toList() )
{
QgsDebugMsgLevel( QStringLiteral( "addBindValue pk %1" ).arg( FID_TO_STRING( fid ) ), 4 );
qry.addBindValue( v );
}
}
else
{
QgsDebugMsg( QStringLiteral( "key values for fid %1 not found." ).arg( fid ) );
for ( int i = 0; i < mPrimaryKeyAttrs.size(); i++ )
{
QgsDebugMsgLevel( QStringLiteral( "addBindValue pk NULL" ).arg( fid ), 4 );
qry.addBindValue( QVariant() );
}
}
break;
}
break;
case PktUnknown:
QgsDebugMsg( QStringLiteral( "Unknown key type" ) );
break;
}
}
QString QgsOracleUtils::whereClause( QgsFeatureId featureId, const QgsFields &fields, QgsOraclePrimaryKeyType primaryKeyType, const QList<int> &primaryKeyAttrs, std::shared_ptr<QgsOracleSharedData> sharedData, QVariantList &args )
{
QString whereClause;
switch ( primaryKeyType )
{
case PktInt:
Q_ASSERT( primaryKeyAttrs.size() == 1 );
whereClause = QString( "%1=?" ).arg( QgsOracleConn::quotedIdentifier( fields.at( primaryKeyAttrs[0] ).name() ) );
args << 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];
QgsField fld = fields.at( idx );
whereClause += delim + QString( "%1=?" ).arg( QgsOracleConn::fieldExpression( fld ) );
args << pkVals[i];
delim = " AND ";
}
}
else
{
whereClause += QString( "ROWID=?" );
args << pkVals[0];
}
}
else
{
QgsDebugMsg( QStringLiteral( "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, std::shared_ptr<QgsOracleSharedData> sharedData, QVariantList &args )
{
QStringList whereClauses;
Q_FOREACH ( const QgsFeatureId featureId, featureIds )
{
whereClauses << whereClause( featureId, fields, primaryKeyType, primaryKeyAttrs, sharedData, args );
}
return whereClauses.isEmpty() ? "" : whereClauses.join( " OR " ).prepend( "(" ).append( ")" );
}
QString QgsOracleUtils::andWhereClauses( const QString &c1, const QString &c2 )
{
if ( c1.isEmpty() )
return c2;
if ( c2.isEmpty() )
return c1;
return QString( "(%1) AND (%2)" ).arg( c1 ).arg( c2 );
}
QString QgsOracleProvider::whereClause( QgsFeatureId featureId, QVariantList &args ) const
{
return QgsOracleUtils::whereClause( featureId, mAttributeFields, mPrimaryKeyType, mPrimaryKeyAttrs, mShared, args );
}
void QgsOracleProvider::setExtent( QgsRectangle &newExtent )
{
mLayerExtent.setXMaximum( newExtent.xMaximum() );
mLayerExtent.setXMinimum( newExtent.xMinimum() );
mLayerExtent.setYMaximum( newExtent.yMaximum() );
mLayerExtent.setYMinimum( newExtent.yMinimum() );
}
/**
* Returns the feature type
*/
QgsWkbTypes::Type QgsOracleProvider::wkbType() const
{
return mRequestedGeomType != QgsWkbTypes::Unknown ? mRequestedGeomType : mDetectedGeomType;
}
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.at( index );
}
QgsFeatureIterator QgsOracleProvider::getFeatures( const QgsFeatureRequest &request ) const
{
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 ) );
}
/**
* Returns the number of fields
*/
uint QgsOracleProvider::fieldCount() const
{
return mAttributeFields.size();
}
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( QStringLiteral( "Loading fields for table %1" ).arg( mTableName ) );
if ( exec( qry, QString( "SELECT comments FROM all_tab_comments WHERE owner=? AND table_name=?" ),
QVariantList() << mOwnerName << mTableName ) )
{
if ( qry.next() )
mDataComment = qry.value( 0 ).toString();
else if ( exec( qry, QString( "SELECT comments FROM all_mview_comments WHERE owner=? AND mview_name=?" ),
QVariantList() << mOwnerName << 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=? AND t.table_name=?" ),
QVariantList() << mOwnerName << mTableName ) )
{
while ( qry.next() )
{
if ( qry.value( 0 ).toString() == mGeometryColumn )
continue;
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();
QVariantList args;
QString sql( "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=? AND t.table_name=?" ) ;
args << mOwnerName << mTableName;
if ( !mGeometryColumn.isEmpty() )
{
sql += " AND t.column_name<>?";
args << mGeometryColumn;
}
if ( !mIncludeGeoAttributes )
{
sql += " AND (t.data_type_owner<>'MDSYS' OR t.data_type<>'SDO_GEOMETRY')";
}
sql += " ORDER BY t.column_id";
if ( exec( qry, sql, args ) )
{
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
{
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=?"
" WHERE i.table_owner=? AND i.table_name=? AND i.ityp_owner='MDSYS' AND i.ityp_name='SPATIAL_INDEX'" ),
QVariantList() << mGeometryColumn << mOwnerName << mTableName ) )
{
if ( qry.next() )
{
mSpatialIndexName = 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( mSpatialIndexName )
.arg( mOwnerName )
.arg( mTableName )
.arg( mGeometryColumn ),
tr( "Oracle" ) );
}
else
{
QgsDebugMsg( QStringLiteral( "Valid spatial index %1 found" ).arg( mSpatialIndexName ) );
mHasSpatialIndex = true;
}
}
}
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" ) );
}
}
mEnabledCapabilities |= QgsVectorDataProvider::CreateSpatialIndex;
}
if ( !mGeometryColumn.isEmpty() )
{
if ( !mHasSpatialIndex )
{
mHasSpatialIndex = qry.exec( QString( "SELECT %2 FROM %1 WHERE sdo_filter(%2,mdsys.sdo_geometry(2003,%3,NULL,mdsys.sdo_elem_info_array(1,1003,3),mdsys.sdo_ordinate_array(-1,-1,1,1)))='TRUE'" )
.arg( mQuery )
.arg( quotedIdentifier( mGeometryColumn ) )
.arg( mSrid < 1 ? "NULL" : QString::number( mSrid ) ) );
}
if ( !mHasSpatialIndex )
{
QgsMessageLog::logMessage( tr( "No spatial index on column %1.%2.%3 found - expect poor performance." )
.arg( mOwnerName )
.arg( mTableName )
.arg( mGeometryColumn ),
tr( "Oracle" ) );
}
}
qry.finish();
if ( !exec( qry, QString( "SELECT * FROM %1 WHERE 1=0" ).arg( mQuery ), QVariantList() ) )
{
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;
QVariant::Type type = field.type();
if ( types.value( field.name() ) == "DATE" )
{
// date types are incorrectly detected as datetime
type = QVariant::Date;
}
QgsField newField( field.name(), type, types.value( field.name() ), field.length(), field.precision(), comments.value( field.name() ) );
QgsFieldConstraints constraints;
if ( mPrimaryKeyAttrs.contains( i ) )
constraints.setConstraint( QgsFieldConstraints::ConstraintNotNull, QgsFieldConstraints::ConstraintOriginProvider );
if ( mPrimaryKeyAttrs.contains( i ) )
constraints.setConstraint( QgsFieldConstraints::ConstraintUnique, QgsFieldConstraints::ConstraintOriginProvider );
newField.setConstraints( constraints );
mAttributeFields.append( newField );
mDefaultValues.append( defvalues.value( field.name(), QVariant() ) );
}
return true;
}
bool QgsOracleProvider::hasSufficientPermsAndCapabilities()
{
QgsDebugMsg( QStringLiteral( "Checking for permissions on the relation" ) );
mEnabledCapabilities = QgsVectorDataProvider::SelectAtId;
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
| QgsVectorDataProvider::RenameAttributes
;
}
else if ( exec( qry, QString( "SELECT privilege FROM all_tab_privs WHERE table_schema=? AND table_name=? AND privilege IN ('DELETE','UPDATE','INSERT','ALTER TABLE')" ),
QVariantList() << mOwnerName << 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 | QgsVectorDataProvider::RenameAttributes;
}
}
if ( !mGeometryColumn.isNull() )
{
if ( exec( qry, QString( "SELECT 1 FROM all_col_privs WHERE table_schema=? AND table_name=? AND column_name=? AND privilege='UPDATE'" ),
QVariantList() << mOwnerName << mTableName << 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 ), QVariantList() ) )
{
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=? AND b.table_name=?" ),
QVariantList() << mOwnerName << 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;
}
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=? AND table_name=?" ), QVariantList() << mOwnerName << 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 )
{
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.at( idx ).type() == QVariant::Int ||
mAttributeFields.at( idx ).type() == QVariant::LongLong ||
mAttributeFields.at( 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;
Q_FOREACH ( int fieldIdx, mPrimaryKeyAttrs )
{
//primary keys are unique, not null
QgsFieldConstraints constraints = mAttributeFields.at( fieldIdx ).constraints();
constraints.setConstraint( QgsFieldConstraints::ConstraintUnique, QgsFieldConstraints::ConstraintOriginProvider );
constraints.setConstraint( QgsFieldConstraints::ConstraintNotNull, QgsFieldConstraints::ConstraintOriginProvider );
mAttributeFields[ fieldIdx ].setConstraints( constraints );
}
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, QVariantList() ) || !qry.next() )