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qgsspatialiteprovider.cpp
6052 lines (5530 loc) · 190 KB
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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 "qgsapplication.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 "qgsjsonutils.h"
#include "qgsvectorlayer.h"
#ifdef HAVE_GUI
#include "qgssourceselectprovider.h"
#include "qgsspatialitesourceselect.h"
#endif
#include <QMessageBox>
#include <QFileInfo>
#include <QDir>
#include <QRegularExpression>
const QString SPATIALITE_KEY = QStringLiteral( "spatialite" );
const QString SPATIALITE_DESCRIPTION = QStringLiteral( "SpatiaLite data provider" );
static const QString SPATIALITE_ARRAY_PREFIX = QStringLiteral( "json" );
static const QString SPATIALITE_ARRAY_SUFFIX = QStringLiteral( "list" );
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:
case QVariant::Date:
case QVariant::Time:
case QVariant::String:
fieldType = QStringLiteral( "TEXT" );
fieldPrec = -1;
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 = -1;
}
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 = SPATIALITE_ARRAY_PREFIX + subField.typeName() + SPATIALITE_ARRAY_SUFFIX;
fieldSize = subField.length();
fieldPrec = subField.precision();
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( "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 ( 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( 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( quotedValue( 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)" )
.arg( quotedIdentifier( tableName ),
quotedIdentifier( primaryKey ),
primaryKeyType );
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:
dim = 3;
FALLTHROUGH;
case QgsWkbTypes::Point:
geometryType = QStringLiteral( "POINT" );
break;
case QgsWkbTypes::LineString25D:
dim = 3;
FALLTHROUGH;
case QgsWkbTypes::LineString:
geometryType = QStringLiteral( "LINESTRING" );
break;
case QgsWkbTypes::Polygon25D:
dim = 3;
FALLTHROUGH;
case QgsWkbTypes::Polygon:
geometryType = QStringLiteral( "POLYGON" );
break;
case QgsWkbTypes::MultiPoint25D:
dim = 3;
FALLTHROUGH;
case QgsWkbTypes::MultiPoint:
geometryType = QStringLiteral( "MULTIPOINT" );
break;
case QgsWkbTypes::MultiLineString25D:
dim = 3;
FALLTHROUGH;
case QgsWkbTypes::MultiLineString:
geometryType = QStringLiteral( "MULTILINESTRING" );
break;
case QgsWkbTypes::MultiPolygon25D:
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( QgsSpatiaLiteProvider::quotedValue( tableName ),
QgsSpatiaLiteProvider::quotedValue( geometryColumn ) )
.arg( srid )
.arg( QgsSpatiaLiteProvider::quotedValue( 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( QString( "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( QLatin1String( "" ), tableName, geometryColumn, QString(), primaryKey );
QgsSpatiaLiteProvider *provider = new QgsSpatiaLiteProvider( dsUri.uri() );
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( "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( "Found a field with the same name of the geometry column. Skip it!" );
continue;
}
if ( !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( "error creating fields " );
if ( errorMessage )
*errorMessage = QObject::tr( "creation of fields failed" );
delete provider;
return QgsVectorLayerExporter::ErrAttributeCreationFailed;
}
QgsDebugMsg( "Done creating fields" );
}
return QgsVectorLayerExporter::NoError;
}
QgsSpatiaLiteProvider::QgsSpatiaLiteProvider( QString const &uri )
: QgsVectorDataProvider( uri )
, mEnabledCapabilities( 0 )
{
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;
// trying to open the SQLite DB
mHandle = QgsSqliteHandle::openDb( mSqlitePath );
if ( !mHandle )
{
return;
}
mSqliteHandle = mHandle->handle();
if ( mSqliteHandle )
{
QStringList pragmaList = anUri.params( QStringLiteral( "pragma" ) );
Q_FOREACH ( const QString &pragma, pragmaList )
{
char *errMsg = nullptr;
int ret = sqlite3_exec( mSqliteHandle, ( "PRAGMA " + pragma ).toUtf8(), nullptr, nullptr, &errMsg );
if ( ret != SQLITE_OK )
{
QgsDebugMsg( QString( "PRAGMA " ) + pragma + QString( " failed : %1" ).arg( errMsg ? errMsg : "" ) );
}
sqlite3_free( errMsg );
}
}
bool alreadyDone = false;
bool ret = false;
gaiaVectorLayersListPtr list = nullptr;
gaiaVectorLayerPtr lyr = nullptr;
bool specialCase = false;
if ( mGeometryColumn.isEmpty() )
specialCase = true; // non-spatial table
if ( mQuery.startsWith( '(' ) && mQuery.endsWith( ')' ) )
specialCase = true;
if ( !specialCase )
{
// 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( "Using checkLayerTypeAbstractInterface" );
alreadyDone = true;
}
if ( !alreadyDone )
{
// check if this one Layer is based on a Table, View or VirtualShapefile
// by using the traditional methods
ret = checkLayerType();
}
if ( !ret )
{
// invalid metadata
mNumberFeatures = 0;
QgsDebugMsg( "Invalid SpatiaLite layer" );
closeDb();
return;
}
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;
}
alreadyDone = false;
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( "Invalid SpatiaLite layer" );
closeDb();
gaiaFreeVectorLayersList( list );
return;
}
if ( !getTableSummaryAbstractInterface( lyr ) ) // gets the extent and feature count
{
mNumberFeatures = 0;
QgsDebugMsg( "Invalid SpatiaLite layer" );
closeDb();
gaiaFreeVectorLayersList( list );
return;
}
// load the columns list
loadFieldsAbstractInterface( lyr );
gaiaFreeVectorLayersList( list );
alreadyDone = true;
}
if ( !alreadyDone )
{
// using the traditional methods
if ( !getGeometryDetails() ) // gets srid and geometry type
{
// the table is not a geometry table
mNumberFeatures = 0;
QgsDebugMsg( "Invalid SpatiaLite layer" );
closeDb();
return;
}
if ( !getTableSummary() ) // gets the extent and feature count
{
mNumberFeatures = 0;
QgsDebugMsg( "Invalid SpatiaLite layer" );
closeDb();
return;
}
// load the columns list
loadFields();
}
if ( !mSqliteHandle )
{
QgsDebugMsg( "Invalid SpatiaLite layer" );
return;
}
if ( mTableBased && hasRowid() )
{
mPrimaryKey = QStringLiteral( "ROWID" );
}
// retrieve version information
spatialiteVersion();
//fill type names into sets
setNativeTypes( QList<NativeType>()
<< QgsVectorDataProvider::NativeType( tr( "Binary object (BLOB)" ), QStringLiteral( "BLOB" ), QVariant::ByteArray )
<< QgsVectorDataProvider::NativeType( tr( "Text" ), QStringLiteral( "TEXT" ), QVariant::String )
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (double)" ), QStringLiteral( "FLOAT" ), QVariant::Double )
<< QgsVectorDataProvider::NativeType( tr( "Whole number (integer)" ), QStringLiteral( "INTEGER" ), QVariant::LongLong )
<< QgsVectorDataProvider::NativeType( tr( "Array of text" ), SPATIALITE_ARRAY_PREFIX.toUpper() + "TEXT" + SPATIALITE_ARRAY_SUFFIX.toUpper(), QVariant::StringList, 0, 0, 0, 0, QVariant::String )
<< QgsVectorDataProvider::NativeType( tr( "Array of decimal numbers (double)" ), SPATIALITE_ARRAY_PREFIX.toUpper() + "REAL" + SPATIALITE_ARRAY_SUFFIX.toUpper(), QVariant::List, 0, 0, 0, 0, QVariant::Double )
<< QgsVectorDataProvider::NativeType( tr( "Array of whole numbers (integer)" ), SPATIALITE_ARRAY_PREFIX.toUpper() + "INTEGER" + SPATIALITE_ARRAY_SUFFIX.toUpper(), QVariant::List, 0, 0, 0, 0, QVariant::LongLong )
);
mValid = true;
}
QgsSpatiaLiteProvider::~QgsSpatiaLiteProvider()
{
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( SPATIALITE_ARRAY_PREFIX ) && type.endsWith( 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( SPATIALITE_ARRAY_PREFIX.length(),
type.length() - SPATIALITE_ARRAY_PREFIX.length() - SPATIALITE_ARRAY_SUFFIX.length() ) );
return TypeSubType( subType.first == QVariant::String ? QVariant::StringList : QVariant::List, subType.first );
}
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(); // cazzo cazzo cazzo
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";
}
mAttributeFields.append( QgsField( name, fieldType, type, 0, 0, QLatin1String( "" ) ) );
}
fld = fld->Next;
}
QString sql = QStringLiteral( "PRAGMA table_info(%1)" ).arg( 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.toLower() == mGeometryColumn )
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 )
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;
}
void QgsSpatiaLiteProvider::fetchConstraints()
{
char **results = nullptr;
char *errMsg = nullptr;
// this is not particularly 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( 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 );
return;
}
if ( rows < 1 )
;
else
{
QString sqlDef = QString::fromUtf8( results[ 1 ] );
// extract definition
QRegularExpression re( QStringLiteral( "\\((.*)\\)" ) );
QRegularExpressionMatch match = re.match( sqlDef );
if ( match.hasMatch() )
{
QString matched = match.captured( 1 );
Q_FOREACH ( QString field, matched.split( ',' ) )
{
field = field.trimmed();
QString fieldName = field.left( field.indexOf( ' ' ) );
QString definition = field.mid( field.indexOf( ' ' ) + 1 );
int fieldIdx = mAttributeFields.lookupField( fieldName );
if ( fieldIdx >= 0 )
{
QgsFieldConstraints constraints = mAttributeFields.at( fieldIdx ).constraints();
if ( definition.contains( QLatin1String( "unique" ), Qt::CaseInsensitive ) || 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 );
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 );
}
}
void QgsSpatiaLiteProvider::insertDefaultValue( int fieldIndex, QString defaultVal )
{
if ( !defaultVal.isEmpty() )
{
QVariant defaultVariant;
switch ( mAttributeFields.at( fieldIndex ).type() )
{
case QVariant::LongLong:
defaultVariant = defaultVal.toLongLong();
break;
case QVariant::Double:
defaultVariant = defaultVal.toDouble();
break;
default:
{
if ( defaultVal.startsWith( '\'' ) )
defaultVal = defaultVal.remove( 0, 1 );
if ( defaultVal.endsWith( '\'' ) )
defaultVal.chop( 1 );
defaultVal.replace( QLatin1String( "''" ), QLatin1String( "'" ) );
defaultVariant = defaultVal;
break;
}
}
mDefaultValues.insert( fieldIndex, defaultVariant );
}
}
void QgsSpatiaLiteProvider::handleError( const QString &sql, char *errorMessage, bool rollback )
{
QgsMessageLog::logMessage( tr( "SQLite error: %2\nSQL: %1" ).arg( sql, errorMessage ? errorMessage : tr( "unknown cause" ) ), tr( "SpatiaLite" ) );
// unexpected error
if ( errorMessage )
{
sqlite3_free( errorMessage );
}
if ( rollback )
{
// ROLLBACK after some previous error
( void )sqlite3_exec( mSqliteHandle, "ROLLBACK", nullptr, nullptr, nullptr );
}
}
void QgsSpatiaLiteProvider::loadFields()
{
int ret;
int i;
sqlite3_stmt *stmt = nullptr;
char **results = nullptr;
int rows;
int columns;
char *errMsg = nullptr;
QString pkName;
int pkCount = 0;
QString sql;
mAttributeFields.clear();
mDefaultValues.clear();
if ( !mIsQuery )
{
mPrimaryKey.clear();
mPrimaryKeyAttrs.clear();
sql = QStringLiteral( "PRAGMA table_info(%1)" ).arg( quotedIdentifier( mTableName ) );
ret = sqlite3_get_table( mSqliteHandle, sql.toUtf8().constData(), &results, &rows, &columns, &errMsg );
if ( ret != SQLITE_OK )
{
handleError( sql, errMsg );
return;
}
if ( rows < 1 )
;
else
{
int realFieldIndex = 0;
for ( i = 1; i <= rows; i++ )
{
QString name = QString::fromUtf8( results[( i * columns ) + 1] );
if ( name.toLower() == mGeometryColumn )
continue;
QString type = QString::fromUtf8( results[( i * columns ) + 2] ).toLower();
QString pk = results[( i * columns ) + 5];
if ( pk.toInt() != 0 )
{
// found a Primary Key column
pkCount++;
if ( mPrimaryKeyAttrs.isEmpty() )
pkName = name;
else
pkName.clear();
mPrimaryKeyAttrs << realFieldIndex;
QgsDebugMsg( "found primaryKey " + name );
}
const TypeSubType fieldType = getVariantType( type );
mAttributeFields.append( QgsField( name, fieldType.first, type, 0, 0, QString(), fieldType.second ) );
insertDefaultValue( realFieldIndex, QString::fromUtf8( results[( i * columns ) + 4] ) );
realFieldIndex += 1;
}
}
sqlite3_free_table( results );
// check for constraints
fetchConstraints();
// for views try to get the primary key from the meta table
if ( mViewBased && mPrimaryKey.isEmpty() )
{
determineViewPrimaryKey();
}
}
else
{
sql = QStringLiteral( "select * from %1 limit 1" ).arg( mQuery );
if ( sqlite3_prepare_v2( mSqliteHandle, sql.toUtf8().constData(), -1, &stmt, nullptr ) != SQLITE_OK )
{
// some error occurred
QgsMessageLog::logMessage( tr( "SQLite error: %2\nSQL: %1" ).arg( sql, sqlite3_errmsg( mSqliteHandle ) ), tr( "SpatiaLite" ) );
return;