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qgsspatialiteprovider.cpp
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qgsspatialiteprovider.cpp
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/***************************************************************************
qgsspatialiteprovider.cpp Data provider for SpatiaLite DBMS
begin : Dec, 2008
copyright : (C) 2008 Sandro Furieri
email : a.furieri@lqt.it
***************************************************************************/
/***************************************************************************
* *
* 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 "qgis.h"
#include "qgsfeature.h"
#include "qgsfields.h"
#include "qgsgeometry.h"
#include "qgsmessageoutput.h"
#include "qgsrectangle.h"
#include "qgscoordinatereferencesystem.h"
#include "qgslogger.h"
#include "qgsmessagelog.h"
#include "qgsvectorlayerexporter.h"
#include "qgsspatialiteutils.h"
#include "qgsspatialiteprovider.h"
#include "qgsspatialiteconnpool.h"
#include "qgsspatialitefeatureiterator.h"
#include "qgsfeedback.h"
#include "qgsspatialitedataitems.h"
#include "qgsspatialiteconnection.h"
#include "qgsspatialitetransaction.h"
#include "qgsspatialiteproviderconnection.h"
#include "qgsjsonutils.h"
#include "qgsvectorlayer.h"
#include "qgsprovidermetadata.h"
#include <QMessageBox>
#include <QFileInfo>
#include <QDir>
#include <QRegularExpression>
#include <nlohmann/json.hpp>
using namespace nlohmann;
const QString QgsSpatiaLiteProvider::SPATIALITE_KEY = QStringLiteral( "spatialite" );
const QString QgsSpatiaLiteProvider::SPATIALITE_DESCRIPTION = QStringLiteral( "SpatiaLite data provider" );
QAtomicInt QgsSpatiaLiteProvider::sSavepointId = 0;
bool QgsSpatiaLiteProvider::convertField( QgsField &field )
{
QString fieldType = QStringLiteral( "TEXT" ); //default to string
int fieldSize = field.length();
int fieldPrec = field.precision();
switch ( field.type() )
{
case QVariant::LongLong:
fieldType = QStringLiteral( "BIGINT" );
fieldSize = -1;
fieldPrec = 0;
break;
case QVariant::DateTime:
fieldType = QStringLiteral( "TIMESTAMP" );
fieldSize = -1;
break;
case QVariant::Date:
fieldType = QStringLiteral( "DATE" );
fieldSize = -1;
break;
case QVariant::Time:
case QVariant::String:
fieldType = QStringLiteral( "TEXT" );
fieldPrec = 0;
break;
case QVariant::Int:
fieldType = QStringLiteral( "INTEGER" );
fieldSize = -1;
fieldPrec = 0;
break;
case QVariant::Double:
if ( fieldSize <= 0 || fieldPrec <= 0 )
{
fieldType = QStringLiteral( "REAL" );
fieldSize = -1;
fieldPrec = 0;
}
else
{
fieldType = QStringLiteral( "NUMERIC" );
}
break;
case QVariant::List:
case QVariant::StringList:
{
QgsField subField = field;
subField.setType( field.subType() );
subField.setSubType( QVariant::Invalid );
if ( !convertField( subField ) ) return false;
fieldType = QgsSpatiaLiteConnection::SPATIALITE_ARRAY_PREFIX + subField.typeName() + QgsSpatiaLiteConnection::SPATIALITE_ARRAY_SUFFIX;
fieldSize = subField.length();
fieldPrec = subField.precision();
break;
}
case QVariant::ByteArray:
fieldType = QStringLiteral( "BLOB" );
fieldSize = -1;
fieldPrec = 0;
break;
default:
return false;
}
field.setTypeName( fieldType );
field.setLength( fieldSize );
field.setPrecision( fieldPrec );
return true;
}
QgsVectorLayerExporter::ExportError
QgsSpatiaLiteProvider::createEmptyLayer( const QString &uri,
const QgsFields &fields,
QgsWkbTypes::Type wkbType,
const QgsCoordinateReferenceSystem &srs,
bool overwrite,
QMap<int, int> *oldToNewAttrIdxMap,
QString *errorMessage,
const QMap<QString, QVariant> *options )
{
Q_UNUSED( options )
// populate members from the uri structure
QgsDataSourceUri dsUri( uri );
QString sqlitePath = dsUri.database();
QString tableName = dsUri.table();
QString geometryColumn = dsUri.geometryColumn();
QString geometryType;
QString primaryKey = dsUri.keyColumn();
QString primaryKeyType;
QgsDebugMsg( "Database is: " + sqlitePath );
QgsDebugMsg( "Table name is: " + tableName );
QgsDebugMsg( "Geometry column is: " + geometryColumn );
// create the table
{
char *errMsg = nullptr;
int toCommit = false;
QString sql;
// trying to open the SQLite DB
QgsSqliteHandle *handle = QgsSqliteHandle::openDb( sqlitePath );
if ( !handle )
{
QgsDebugMsg( QStringLiteral( "Connection to database failed. Import of layer aborted." ) );
if ( errorMessage )
*errorMessage = QObject::tr( "Connection to database failed" );
return QgsVectorLayerExporter::ErrConnectionFailed;
}
sqlite3 *sqliteHandle = handle->handle();
// get the pk's name and type
if ( primaryKey.isEmpty() )
{
// if no pk name was passed, define the new pk field name
int index = 0;
QString pk = primaryKey = QStringLiteral( "pk" );
for ( int fldIdx = 0; fldIdx < fields.count(); ++fldIdx )
{
if ( fields.at( fldIdx ).name() == primaryKey )
{
// it already exists, try again with a new name
primaryKey = QStringLiteral( "%1_%2" ).arg( pk ).arg( index++ );
fldIdx = -1; // it is incremented in the for loop, i.e. restarts at 0
}
}
}
else
{
// search for the passed field
for ( int fldIdx = 0; fldIdx < fields.count(); ++fldIdx )
{
if ( fields.at( fldIdx ).name() == primaryKey )
{
// found it, get the field type
QgsField fld = fields.at( fldIdx );
if ( ( options && options->value( QStringLiteral( "skipConvertFields" ), false ).toBool() ) || convertField( fld ) )
{
primaryKeyType = fld.typeName();
}
}
}
}
// if the pk field doesn't exist yet, create an integer pk field
// as it's autoincremental
if ( primaryKeyType.isEmpty() )
{
primaryKeyType = QStringLiteral( "INTEGER" );
}
else
{
// if the pk field's type is bigint, use the autoincremental
// integer type instead
if ( primaryKeyType == QLatin1String( "BIGINT" ) )
{
primaryKeyType = QStringLiteral( "INTEGER" );
}
}
try
{
int ret = sqlite3_exec( sqliteHandle, "BEGIN", nullptr, nullptr, &errMsg );
if ( ret != SQLITE_OK )
throw SLException( errMsg );
toCommit = true;
if ( overwrite )
{
// delete the table if exists and the related entry in geometry_columns, then re-create it
sql = QStringLiteral( "DROP TABLE IF EXISTS %1" )
.arg( QgsSqliteUtils::quotedIdentifier( tableName ) );
ret = sqlite3_exec( sqliteHandle, sql.toUtf8().constData(), nullptr, nullptr, &errMsg );
if ( ret != SQLITE_OK )
throw SLException( errMsg );
sql = QStringLiteral( "DELETE FROM geometry_columns WHERE upper(f_table_name) = upper(%1)" )
.arg( QgsSqliteUtils::quotedString( tableName ) );
ret = sqlite3_exec( sqliteHandle, sql.toUtf8().constData(), nullptr, nullptr, &errMsg );
if ( ret != SQLITE_OK )
throw SLException( errMsg );
}
sql = QStringLiteral( "CREATE TABLE %1 (%2 %3 PRIMARY KEY%4)" )
.arg( QgsSqliteUtils::quotedIdentifier( tableName ),
QgsSqliteUtils::quotedIdentifier( primaryKey ),
primaryKeyType,
primaryKeyType == QLatin1String( "INTEGER" ) ? QStringLiteral( " AUTOINCREMENT" ) : QString() );
ret = sqlite3_exec( sqliteHandle, sql.toUtf8().constData(), nullptr, nullptr, &errMsg );
if ( ret != SQLITE_OK )
throw SLException( errMsg );
// get geometry type, dim and srid
int dim = 2;
long srid = srs.postgisSrid();
switch ( wkbType )
{
case QgsWkbTypes::Point25D:
case QgsWkbTypes::PointZ:
dim = 3;
FALLTHROUGH
case QgsWkbTypes::Point:
geometryType = QStringLiteral( "POINT" );
break;
case QgsWkbTypes::LineString25D:
case QgsWkbTypes::LineStringZ:
dim = 3;
FALLTHROUGH
case QgsWkbTypes::LineString:
geometryType = QStringLiteral( "LINESTRING" );
break;
case QgsWkbTypes::Polygon25D:
case QgsWkbTypes::PolygonZ:
dim = 3;
FALLTHROUGH
case QgsWkbTypes::Polygon:
geometryType = QStringLiteral( "POLYGON" );
break;
case QgsWkbTypes::MultiPoint25D:
case QgsWkbTypes::MultiPointZ:
dim = 3;
FALLTHROUGH
case QgsWkbTypes::MultiPoint:
geometryType = QStringLiteral( "MULTIPOINT" );
break;
case QgsWkbTypes::MultiLineString25D:
case QgsWkbTypes::MultiLineStringZ:
dim = 3;
FALLTHROUGH
case QgsWkbTypes::MultiLineString:
geometryType = QStringLiteral( "MULTILINESTRING" );
break;
case QgsWkbTypes::MultiPolygon25D:
case QgsWkbTypes::MultiPolygonZ:
dim = 3;
FALLTHROUGH
case QgsWkbTypes::MultiPolygon:
geometryType = QStringLiteral( "MULTIPOLYGON" );
break;
case QgsWkbTypes::Unknown:
geometryType = QStringLiteral( "GEOMETRY" );
break;
case QgsWkbTypes::NoGeometry:
default:
dim = 0;
break;
}
// create geometry column
if ( !geometryType.isEmpty() )
{
sql = QStringLiteral( "SELECT AddGeometryColumn(%1, %2, %3, %4, %5)" )
.arg( QgsSqliteUtils::quotedString( tableName ),
QgsSqliteUtils::quotedString( geometryColumn ) )
.arg( srid )
.arg( QgsSqliteUtils::quotedString( geometryType ) )
.arg( dim );
ret = sqlite3_exec( sqliteHandle, sql.toUtf8().constData(), nullptr, nullptr, &errMsg );
if ( ret != SQLITE_OK )
throw SLException( errMsg );
}
else
{
geometryColumn = QString();
}
ret = sqlite3_exec( sqliteHandle, "COMMIT", nullptr, nullptr, &errMsg );
if ( ret != SQLITE_OK )
throw SLException( errMsg );
}
catch ( SLException &e )
{
QgsDebugMsg( QStringLiteral( "creation of data source %1 failed. %2" )
.arg( tableName,
e.errorMessage() )
);
if ( errorMessage )
*errorMessage = QObject::tr( "creation of data source %1 failed. %2" )
.arg( tableName,
e.errorMessage() );
if ( toCommit )
{
// ROLLBACK after some previous error
sqlite3_exec( sqliteHandle, "ROLLBACK", nullptr, nullptr, nullptr );
}
QgsSqliteHandle::closeDb( handle );
return QgsVectorLayerExporter::ErrCreateLayer;
}
QgsSqliteHandle::closeDb( handle );
QgsDebugMsg( "layer " + tableName + " created." );
}
// use the provider to edit the table
dsUri.setDataSource( QString(), tableName, geometryColumn, QString(), primaryKey );
QgsDataProvider::ProviderOptions providerOptions;
QgsSpatiaLiteProvider *provider = new QgsSpatiaLiteProvider( dsUri.uri(), providerOptions );
if ( !provider->isValid() )
{
QgsDebugMsg( "The layer " + tableName + " just created is not valid or not supported by the provider." );
if ( errorMessage )
*errorMessage = QObject::tr( "loading of the layer %1 failed" )
.arg( tableName );
delete provider;
return QgsVectorLayerExporter::ErrInvalidLayer;
}
QgsDebugMsg( QStringLiteral( "layer loaded" ) );
// add fields to the layer
if ( oldToNewAttrIdxMap )
oldToNewAttrIdxMap->clear();
if ( fields.size() > 0 )
{
int offset = 1;
// get the list of fields
QList<QgsField> flist;
for ( int fldIdx = 0; fldIdx < fields.count(); ++fldIdx )
{
QgsField fld = fields.at( fldIdx );
if ( fld.name() == primaryKey )
continue;
if ( fld.name() == geometryColumn )
{
QgsDebugMsg( QStringLiteral( "Found a field with the same name of the geometry column. Skip it!" ) );
continue;
}
if ( !( options && options->value( QStringLiteral( "skipConvertFields" ), false ).toBool() ) && !convertField( fld ) )
{
QgsDebugMsg( "error creating field " + fld.name() + ": unsupported type" );
if ( errorMessage )
*errorMessage = QObject::tr( "unsupported type for field %1" )
.arg( fld.name() );
delete provider;
return QgsVectorLayerExporter::ErrAttributeTypeUnsupported;
}
QgsDebugMsg( "creating field #" + QString::number( fldIdx ) +
" -> #" + QString::number( offset ) +
" name " + fld.name() +
" type " + QString( QVariant::typeToName( fld.type() ) ) +
" typename " + fld.typeName() +
" width " + QString::number( fld.length() ) +
" precision " + QString::number( fld.precision() ) );
flist.append( fld );
if ( oldToNewAttrIdxMap )
oldToNewAttrIdxMap->insert( fldIdx, offset );
offset++;
}
if ( !provider->addAttributes( flist ) )
{
QgsDebugMsg( QStringLiteral( "error creating fields " ) );
if ( errorMessage )
*errorMessage = QObject::tr( "creation of fields failed" );
delete provider;
return QgsVectorLayerExporter::ErrAttributeCreationFailed;
}
QgsDebugMsg( QStringLiteral( "Done creating fields" ) );
}
return QgsVectorLayerExporter::NoError;
}
QgsSpatiaLiteProvider::QgsSpatiaLiteProvider( QString const &uri, const ProviderOptions &options, QgsDataProvider::ReadFlags flags )
: QgsVectorDataProvider( uri, options, flags )
{
nDims = GAIA_XY;
QgsDataSourceUri anUri = QgsDataSourceUri( uri );
// parsing members from the uri structure
mTableName = anUri.table();
mGeometryColumn = anUri.geometryColumn().toLower();
mSqlitePath = anUri.database();
mSubsetString = anUri.sql();
mPrimaryKey = anUri.keyColumn();
mQuery = mTableName;
// Retrieve a shared connection
mHandle = QgsSqliteHandle::openDb( mSqlitePath );
if ( !mHandle )
{
return;
}
// Setup handle
mSqliteHandle = mHandle->handle();
if ( mSqliteHandle )
{
const QStringList pragmaList = anUri.params( QStringLiteral( "pragma" ) );
for ( const auto &pragma : pragmaList )
{
char *errMsg = nullptr;
int ret = exec_sql( QStringLiteral( "PRAGMA %1" ).arg( pragma ), errMsg );
if ( ret != SQLITE_OK )
{
QgsDebugMsg( QStringLiteral( "PRAGMA " ) + pragma + QString( " failed : %1" ).arg( errMsg ? errMsg : "" ) );
}
sqlite3_free( errMsg );
}
}
bool ret = false;
gaiaVectorLayersListPtr list = nullptr;
gaiaVectorLayerPtr lyr = nullptr;
// Set special cases (views, queries, no geometry specified)
bool specialCase { mGeometryColumn.isEmpty() ||
( mQuery.startsWith( '(' ) &&mQuery.endsWith( ')' ) ) };
// Normal case
if ( ! specialCase )
{
// Set pk to ROWID in case the pk passed in the URL is not usable
if ( mPrimaryKey.isEmpty() || ! tablePrimaryKeys( mTableName ).contains( mPrimaryKey ) )
{
mPrimaryKey = QStringLiteral( "ROWID" );
}
// using v.4.0 Abstract Interface
ret = true;
list = gaiaGetVectorLayersList( mSqliteHandle,
mTableName.toUtf8().constData(),
mGeometryColumn.toUtf8().constData(),
GAIA_VECTORS_LIST_OPTIMISTIC );
if ( list )
lyr = list->First;
ret = lyr && checkLayerTypeAbstractInterface( lyr );
QgsDebugMsg( QStringLiteral( "Using checkLayerTypeAbstractInterface" ) );
}
else // views, no geometry etc
{
ret = checkLayerType();
}
if ( !ret )
{
// invalid metadata
mNumberFeatures = 0;
QgsDebugMsg( QStringLiteral( "Invalid SpatiaLite layer" ) );
closeDb();
return;
}
// TODO: move after pk discovery is definitely done?
mEnabledCapabilities = mPrimaryKey.isEmpty() ? QgsVectorDataProvider::Capabilities() : ( QgsVectorDataProvider::SelectAtId );
if ( ( mTableBased || mViewBased ) && !mReadOnly )
{
// enabling editing only for Tables [excluding Views and VirtualShapes]
mEnabledCapabilities |= QgsVectorDataProvider::DeleteFeatures | QgsVectorDataProvider::FastTruncate;
if ( !mGeometryColumn.isEmpty() )
mEnabledCapabilities |= QgsVectorDataProvider::ChangeGeometries;
mEnabledCapabilities |= QgsVectorDataProvider::ChangeAttributeValues;
mEnabledCapabilities |= QgsVectorDataProvider::AddFeatures;
mEnabledCapabilities |= QgsVectorDataProvider::AddAttributes;
mEnabledCapabilities |= QgsVectorDataProvider::CreateAttributeIndex;
mEnabledCapabilities |= QgsVectorDataProvider::TransactionSupport;
}
if ( lyr )
{
// using the v.4.0 AbstractInterface
if ( !getGeometryDetailsAbstractInterface( lyr ) ) // gets srid and geometry type
{
// the table is not a geometry table
mNumberFeatures = 0;
QgsDebugMsg( QStringLiteral( "Invalid SpatiaLite layer" ) );
closeDb();
gaiaFreeVectorLayersList( list );
return;
}
if ( !getTableSummaryAbstractInterface( lyr ) ) // gets the extent and feature count
{
mNumberFeatures = 0;
QgsDebugMsg( QStringLiteral( "Invalid SpatiaLite layer" ) );
closeDb();
gaiaFreeVectorLayersList( list );
return;
}
// load the columns list
loadFieldsAbstractInterface( lyr );
gaiaFreeVectorLayersList( list );
}
else
{
// using the traditional methods
if ( !getGeometryDetails() ) // gets srid and geometry type
{
// the table is not a geometry table
mNumberFeatures = 0;
QgsDebugMsg( QStringLiteral( "Invalid SpatiaLite layer" ) );
closeDb();
return;
}
if ( !getTableSummary() ) // gets the extent and feature count
{
mNumberFeatures = 0;
QgsDebugMsg( QStringLiteral( "Invalid SpatiaLite layer" ) );
closeDb();
return;
}
// load the columns list
loadFields();
}
if ( !mSqliteHandle )
{
QgsDebugMsg( QStringLiteral( "Invalid SpatiaLite layer" ) );
return;
}
// Fallback to ROWID is pk is empty or not usable after fields configuration
if ( mTableBased && hasRowid() && ( mPrimaryKey.isEmpty() || ! tablePrimaryKeys( mTableName ).contains( mPrimaryKey ) ) )
{
mPrimaryKey = QStringLiteral( "ROWID" );
}
// retrieve version information
spatialiteVersion();
//fill type names into sets
setNativeTypes( QgsSpatiaLiteConnection::nativeTypes() );
// Update extent and feature count
if ( ! mSubsetString.isEmpty() )
getTableSummary();
mValid = true;
}
QgsSpatiaLiteProvider::~QgsSpatiaLiteProvider()
{
if ( mTransaction )
{
QString errorMessage;
if ( ! mTransaction->rollback( errorMessage ) )
{
QgsMessageLog::logMessage( tr( "Error closing transaction for %1" ).arg( mTableName ), tr( "SpatiaLite" ) );
}
}
closeDb();
invalidateConnections( mSqlitePath );
}
QgsAbstractFeatureSource *QgsSpatiaLiteProvider::featureSource() const
{
return new QgsSpatiaLiteFeatureSource( this );
}
void QgsSpatiaLiteProvider::updatePrimaryKeyCapabilities()
{
if ( mPrimaryKey.isEmpty() )
{
mEnabledCapabilities &= ~QgsVectorDataProvider::SelectAtId;
}
else
{
mEnabledCapabilities |= QgsVectorDataProvider::SelectAtId;
}
}
typedef QPair<QVariant::Type, QVariant::Type> TypeSubType;
static TypeSubType getVariantType( const QString &type )
{
// making some assumptions in order to guess a more realistic type
if ( type == QLatin1String( "int" ) ||
type == QLatin1String( "integer" ) ||
type == QLatin1String( "integer64" ) ||
type == QLatin1String( "bigint" ) ||
type == QLatin1String( "smallint" ) ||
type == QLatin1String( "tinyint" ) ||
type == QLatin1String( "boolean" ) )
return TypeSubType( QVariant::LongLong, QVariant::Invalid );
else if ( type == QLatin1String( "real" ) ||
type == QLatin1String( "double" ) ||
type == QLatin1String( "double precision" ) ||
type == QLatin1String( "float" ) )
return TypeSubType( QVariant::Double, QVariant::Invalid );
else if ( type.startsWith( QgsSpatiaLiteConnection::SPATIALITE_ARRAY_PREFIX ) && type.endsWith( QgsSpatiaLiteConnection::SPATIALITE_ARRAY_SUFFIX ) )
{
// New versions of OGR convert list types (StringList, IntegerList, Integer64List and RealList)
// to JSON when it stores a Spatialite table. It sets the column type as JSONSTRINGLIST,
// JSONINTEGERLIST, JSONINTEGER64LIST or JSONREALLIST
TypeSubType subType = getVariantType( type.mid( QgsSpatiaLiteConnection::SPATIALITE_ARRAY_PREFIX.length(),
type.length() - QgsSpatiaLiteConnection::SPATIALITE_ARRAY_PREFIX.length() - QgsSpatiaLiteConnection::SPATIALITE_ARRAY_SUFFIX.length() ) );
return TypeSubType( subType.first == QVariant::String ? QVariant::StringList : QVariant::List, subType.first );
}
else if ( type == QLatin1String( "jsonarray" ) )
{
return TypeSubType( QVariant::List, QVariant::Invalid );
}
else if ( type == QLatin1String( "blob" ) )
{
return TypeSubType( QVariant::ByteArray, QVariant::Invalid );
}
else if ( type == QLatin1String( "timestamp" ) ||
type == QLatin1String( "datetime" ) )
{
return TypeSubType( QVariant::DateTime, QVariant::Invalid );
}
else if ( type == QLatin1String( "date" ) )
{
return TypeSubType( QVariant::Date, QVariant::Invalid );
}
else
// for sure any SQLite value can be represented as SQLITE_TEXT
return TypeSubType( QVariant::String, QVariant::Invalid );
}
void QgsSpatiaLiteProvider::loadFieldsAbstractInterface( gaiaVectorLayerPtr lyr )
{
if ( !lyr )
return;
mAttributeFields.clear();
mPrimaryKey.clear();
mPrimaryKeyAttrs.clear();
mDefaultValues.clear();
gaiaLayerAttributeFieldPtr fld = lyr->First;
if ( !fld )
{
// defaulting to traditional loadFields()
loadFields();
return;
}
while ( fld )
{
QString name = QString::fromUtf8( fld->AttributeFieldName );
if ( name.toLower() != mGeometryColumn )
{
const char *type = "TEXT";
QVariant::Type fieldType = QVariant::String; // default: SQLITE_TEXT
if ( fld->IntegerValuesCount != 0 && fld->DoubleValuesCount == 0 &&
fld->TextValuesCount == 0 && fld->BlobValuesCount == 0 )
{
fieldType = QVariant::LongLong;
type = "INTEGER";
}
if ( fld->DoubleValuesCount != 0 && fld->TextValuesCount == 0 &&
fld->BlobValuesCount == 0 )
{
fieldType = QVariant::Double;
type = "DOUBLE";
}
if ( fld->BlobValuesCount != 0 )
{
fieldType = QVariant::ByteArray;
type = "BLOB";
}
mAttributeFields.append( QgsField( name, fieldType, type, 0, 0, QString() ) );
}
fld = fld->Next;
}
QString sql = QStringLiteral( "PRAGMA table_info(%1)" ).arg( QgsSqliteUtils::quotedIdentifier( mTableName ) );
char **results = nullptr;
int rows;
int columns;
char *errMsg = nullptr;
int ret = sqlite3_get_table( mSqliteHandle, sql.toUtf8().constData(), &results, &rows, &columns, &errMsg );
if ( ret == SQLITE_OK )
{
int realFieldIndex = 0;
for ( int i = 1; i <= rows; i++ )
{
QString name = QString::fromUtf8( results[( i * columns ) + 1] );
if ( name.compare( mGeometryColumn, Qt::CaseInsensitive ) == 0 )
continue;
insertDefaultValue( realFieldIndex, QString::fromUtf8( results[( i * columns ) + 4] ) );
QString pk = results[( i * columns ) + 5];
QString type = results[( i * columns ) + 2];
type = type.toLower();
const int fieldIndex = mAttributeFields.indexFromName( name );
if ( fieldIndex >= 0 )
{
// set the actual type name, as given by sqlite
QgsField &field = mAttributeFields[fieldIndex];
field.setTypeName( type );
// TODO: column 4 tells us if the field is nullable. Should use that info...
if ( field.type() == QVariant::String )
{
// if the type seems unknown, fix it with what we actually have
TypeSubType typeSubType = getVariantType( type );
field.setType( typeSubType.first );
field.setSubType( typeSubType.second );
}
}
if ( pk.toInt() == 0 || ( type.compare( QLatin1String( "integer" ), Qt::CaseSensitivity::CaseInsensitive ) != 0 &&
type.compare( QLatin1String( "bigint" ), Qt::CaseSensitivity::CaseInsensitive ) != 0 ) )
continue;
if ( mPrimaryKeyAttrs.isEmpty() )
mPrimaryKey = name;
else
mPrimaryKey.clear();
mPrimaryKeyAttrs << i - 1;
realFieldIndex += 1;
}
}
// check for constraints
fetchConstraints();
// for views try to get the primary key from the meta table
if ( mViewBased && mPrimaryKey.isEmpty() )
{
determineViewPrimaryKey();
}
updatePrimaryKeyCapabilities();
sqlite3_free_table( results );
}
QString QgsSpatiaLiteProvider::spatialiteVersion()
{
if ( mGotSpatialiteVersion )
return mSpatialiteVersionInfo;
int ret;
char **results = nullptr;
int rows;
int columns;
char *errMsg = nullptr;
QString sql;
sql = QStringLiteral( "SELECT spatialite_version()" );
ret = sqlite3_get_table( mSqliteHandle, sql.toUtf8(), &results, &rows, &columns, &errMsg );
if ( ret != SQLITE_OK || rows != 1 )
{
QgsMessageLog::logMessage( tr( "Retrieval of spatialite version failed" ), tr( "SpatiaLite" ) );
return QString();
}
mSpatialiteVersionInfo = QString::fromUtf8( results[( 1 * columns ) + 0] );
sqlite3_free_table( results );
QgsDebugMsg( "SpatiaLite version info: " + mSpatialiteVersionInfo );
QStringList spatialiteParts = mSpatialiteVersionInfo.split( ' ', QString::SkipEmptyParts );
// Get major and minor version
QStringList spatialiteVersionParts = spatialiteParts[0].split( '.', QString::SkipEmptyParts );
if ( spatialiteVersionParts.size() < 2 )
{
QgsMessageLog::logMessage( tr( "Could not parse spatialite version string '%1'" ).arg( mSpatialiteVersionInfo ), tr( "SpatiaLite" ) );
return QString();
}
mSpatialiteVersionMajor = spatialiteVersionParts[0].toInt();
mSpatialiteVersionMinor = spatialiteVersionParts[1].toInt();
mGotSpatialiteVersion = true;
return mSpatialiteVersionInfo;
}
bool QgsSpatiaLiteProvider::versionIsAbove( sqlite3 *sqlite_handle, int major, int minor )
{
char **results = nullptr;
char *errMsg = nullptr;
int rows, columns;
bool above = false;
int ret = sqlite3_get_table( sqlite_handle, "select spatialite_version()", &results, &rows, &columns, nullptr );
if ( ret == SQLITE_OK )
{
if ( rows == 1 && columns == 1 )
{
QString version = QString::fromUtf8( results[1] );
QStringList parts = version.split( ' ', QString::SkipEmptyParts );
if ( !parts.empty() )
{
QStringList verparts = parts.at( 0 ).split( '.', QString::SkipEmptyParts );
above = verparts.size() >= 2 && ( verparts.at( 0 ).toInt() > major || ( verparts.at( 0 ).toInt() == major && verparts.at( 1 ).toInt() >= minor ) );
}
}
sqlite3_free_table( results );
}
else
{
QgsLogger::warning( QStringLiteral( "SQLite error querying version: %1" ).arg( errMsg ) );
sqlite3_free( errMsg );
}
return above;
}
QString QgsSpatiaLiteProvider::tableSchemaCondition( const QgsDataSourceUri &dsUri )
{
return dsUri.schema().isEmpty() ?
QStringLiteral( "IS NULL" ) :
QStringLiteral( "= %1" ).arg( QgsSqliteUtils::quotedString( dsUri.schema( ) ) );
}
void QgsSpatiaLiteProvider::fetchConstraints()
{
char **results = nullptr;
char *errMsg = nullptr;
// this is not robust but unfortunately sqlite offers no way to check directly
// for the presence of constraints on a field (only indexes, but not all constraints are indexes)
QString sql = QStringLiteral( "SELECT sql FROM sqlite_master WHERE type='table' AND name=%1" ).arg( QgsSqliteUtils::quotedIdentifier( mTableName ) );
int columns = 0;
int rows = 0;
int ret = sqlite3_get_table( mSqliteHandle, sql.toUtf8().constData(), &results, &rows, &columns, &errMsg );
if ( ret != SQLITE_OK )
{
handleError( sql, errMsg, QString() );
return;
}
if ( rows < 1 )
;
else
{
// Use the same logic implemented in GDAL for GPKG
QSet<QString> uniqueFieldNames;
{
QString errMsg;
uniqueFieldNames = QgsSqliteUtils::uniqueFields( mSqliteHandle, mTableName, errMsg );
if ( ! errMsg.isEmpty() )
{
QgsMessageLog::logMessage( tr( "Error searching for unique constraints on fields for table %1" ).arg( mTableName ), tr( "spatialite" ) );
}
}
QString sqlDef = QString::fromUtf8( results[ 1 ] );
// extract definition
QRegularExpression re( QStringLiteral( R"raw(\((.*)\))raw" ) );
QRegularExpressionMatch match = re.match( sqlDef );
if ( match.hasMatch() )
{
const QString matched = match.captured( 1 );
for ( auto &field : matched.split( ',' ) )
{
field = field.trimmed();
QString fieldName;
QString definition;
const QChar delimiter { field.at( 0 ) };
if ( delimiter == '"' || delimiter == '`' )
{
const int start { field.indexOf( delimiter ) + 1};
const int end { field.indexOf( delimiter, start ) };
fieldName = field.mid( start, end - start );
definition = field.mid( end + 1 );
}
else
{
fieldName = field.left( field.indexOf( ' ' ) );
definition = field.mid( field.indexOf( ' ' ) + 1 );
}
int fieldIdx = mAttributeFields.lookupField( fieldName );
if ( fieldIdx >= 0 )
{
QgsFieldConstraints constraints = mAttributeFields.at( fieldIdx ).constraints();
if ( uniqueFieldNames.contains( fieldName ) || definition.contains( QLatin1String( "primary key" ), Qt::CaseInsensitive ) )
constraints.setConstraint( QgsFieldConstraints::ConstraintUnique, QgsFieldConstraints::ConstraintOriginProvider );
if ( definition.contains( QLatin1String( "not null" ), Qt::CaseInsensitive ) || definition.contains( QLatin1String( "primary key" ), Qt::CaseInsensitive ) )
constraints.setConstraint( QgsFieldConstraints::ConstraintNotNull, QgsFieldConstraints::ConstraintOriginProvider );
mAttributeFields[ fieldIdx ].setConstraints( constraints );
}
}
}
}
sqlite3_free_table( results );
for ( const auto fieldIdx : qgis::as_const( mPrimaryKeyAttrs ) )
{
QgsFieldConstraints constraints = mAttributeFields.at( fieldIdx ).constraints();
constraints.setConstraint( QgsFieldConstraints::ConstraintUnique, QgsFieldConstraints::ConstraintOriginProvider );
constraints.setConstraint( QgsFieldConstraints::ConstraintNotNull, QgsFieldConstraints::ConstraintOriginProvider );
mAttributeFields[ fieldIdx ].setConstraints( constraints );
if ( mAttributeFields[ fieldIdx ].name() == mPrimaryKey )
{
QString sql = QStringLiteral( "SELECT sql FROM sqlite_master WHERE type = 'table' AND tbl_name like %1" ).arg( QgsSqliteUtils::quotedIdentifier( mTableName ) );
int ret = sqlite3_get_table( mSqliteHandle, sql.toUtf8().constData(), &results, &rows, &columns, &errMsg );
if ( ret != SQLITE_OK )
{
handleError( sql, errMsg, QString() );
return;
}
if ( rows >= 1 )
{
QString tableSql = QString::fromUtf8( results[ 1 ] );
QRegularExpression rx( QStringLiteral( "[(,]\\s*(?:%1|\"%1\"|`%1`)\\s+INTEGER PRIMARY KEY AUTOINCREMENT" ).arg( mPrimaryKey ), QRegularExpression::CaseInsensitiveOption );
if ( tableSql.contains( rx ) )
{
mPrimaryKeyAutoIncrement = true;
insertDefaultValue( fieldIdx, tr( "Autogenerate" ) );
}