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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 "qgsapplication.h"
#include "qgsfeature.h"
#include "qgsfield.h"
#include "qgsgeometry.h"
#include "qgsmessageoutput.h"
#include "qgsrectangle.h"
#include "qgscoordinatereferencesystem.h"
#include "qgslogger.h"
#include "qgsmessagelog.h"
#include "qgsvectorlayerimport.h"
#include "qgsslconnect.h"
#include "qgsspatialiteprovider.h"
#include "qgsspatialiteconnpool.h"
#include "qgsspatialitefeatureiterator.h"
#include <QMessageBox>
#include <QFileInfo>
#include <QDir>
#ifdef _MSC_VER
#define strcasecmp(a,b) stricmp(a,b)
#endif
const QString SPATIALITE_KEY = "spatialite";
const QString SPATIALITE_DESCRIPTION = "SpatiaLite data provider";
bool QgsSpatiaLiteProvider::convertField( QgsField &field )
{
QString fieldType = "TEXT"; //default to string
int fieldSize = field.length();
int fieldPrec = field.precision();
switch ( field.type() )
{
case QVariant::LongLong:
fieldType = "BIGINT";
fieldSize = -1;
fieldPrec = 0;
break;
case QVariant::DateTime:
case QVariant::Date:
case QVariant::Time:
case QVariant::String:
fieldType = "TEXT";
fieldPrec = -1;
break;
case QVariant::Int:
fieldType = "INTEGER";
fieldSize = -1;
fieldPrec = 0;
break;
case QVariant::Double:
if ( fieldSize <= 0 || fieldPrec <= 0 )
{
fieldType = "REAL";
fieldSize = -1;
fieldPrec = -1;
}
else
{
fieldType = "NUMERIC";
}
break;
default:
return false;
}
field.setTypeName( fieldType );
field.setLength( fieldSize );
field.setPrecision( fieldPrec );
return true;
}
QgsVectorLayerImport::ImportError
QgsSpatiaLiteProvider::createEmptyLayer(
const QString& uri,
const QgsFields &fields,
QGis::WkbType 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
{
QgsSqliteHandle *handle;
sqlite3 *sqliteHandle = nullptr;
char *errMsg = nullptr;
int toCommit = false;
QString sql;
// trying to open the SQLite DB
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 QgsVectorLayerImport::ErrConnectionFailed;
}
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 = "pk";
for ( int fldIdx = 0; fldIdx < fields.count(); ++fldIdx )
{
if ( fields[fldIdx].name() == primaryKey )
{
// it already exists, try again with a new name
primaryKey = QString( "%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[fldIdx].name() == primaryKey )
{
// found, get the field type
QgsField fld = fields[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 = "INTEGER";
}
else
{
// if the pk field's type is bigint, use the autoincremental
// integer type instead
if ( primaryKeyType == "BIGINT" )
{
primaryKeyType = "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 = QString( "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 = QString( "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 = QString( "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 QGis::WKBPoint25D:
dim = 3;
FALLTHROUGH;
case QGis::WKBPoint:
geometryType = "POINT";
break;
case QGis::WKBLineString25D:
dim = 3;
FALLTHROUGH;
case QGis::WKBLineString:
geometryType = "LINESTRING";
break;
case QGis::WKBPolygon25D:
dim = 3;
FALLTHROUGH;
case QGis::WKBPolygon:
geometryType = "POLYGON";
break;
case QGis::WKBMultiPoint25D:
dim = 3;
FALLTHROUGH;
case QGis::WKBMultiPoint:
geometryType = "MULTIPOINT";
break;
case QGis::WKBMultiLineString25D:
dim = 3;
FALLTHROUGH;
case QGis::WKBMultiLineString:
geometryType = "MULTILINESTRING";
break;
case QGis::WKBMultiPolygon25D:
dim = 3;
FALLTHROUGH;
case QGis::WKBMultiPolygon:
geometryType = "MULTIPOLYGON";
break;
case QGis::WKBUnknown:
geometryType = "GEOMETRY";
break;
case QGis::WKBNoGeometry:
default:
dim = 0;
break;
}
// create geometry column
if ( !geometryType.isEmpty() )
{
sql = QString( "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 QgsVectorLayerImport::ErrCreateLayer;
}
QgsSqliteHandle::closeDb( handle );
QgsDebugMsg( "layer " + tableName + " created." );
}
// use the provider to edit the table
dsUri.setDataSource( "", 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 QgsVectorLayerImport::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[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 QgsVectorLayerImport::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 QgsVectorLayerImport::ErrAttributeCreationFailed;
}
QgsDebugMsg( "Done creating fields" );
}
return QgsVectorLayerImport::NoError;
}
QgsSpatiaLiteProvider::QgsSpatiaLiteProvider( QString const &uri )
: QgsVectorDataProvider( uri )
, valid( false )
, isQuery( false )
, mTableBased( false )
, mViewBased( false )
, mVShapeBased( false )
, mReadOnly( false )
, geomType( QGis::WKBUnknown )
, sqliteHandle( nullptr )
, mSrid( -1 )
, numberFeatures( 0 )
, spatialIndexRTree( false )
, spatialIndexMbrCache( false )
, enabledCapabilities( 0 )
, mGotSpatialiteVersion( false )
, mSpatialiteVersionMajor( 0 )
, mSpatialiteVersionMinor( 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
handle = QgsSqliteHandle::openDb( mSqlitePath );
if ( !handle )
{
return;
}
sqliteHandle = handle->handle();
bool alreadyDone = false;
bool ret = false;
#ifdef SPATIALITE_VERSION_GE_4_0_0
// only if libspatialite version is >= 4.0.0
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( handle->handle(),
mTableName.toUtf8().constData(),
mGeometryColumn.toUtf8().constData(),
GAIA_VECTORS_LIST_OPTIMISTIC );
if ( list )
lyr = list->First;
ret = lyr && checkLayerTypeAbstractInterface( lyr );
alreadyDone = true;
}
#endif
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
numberFeatures = 0;
QgsDebugMsg( "Invalid SpatiaLite layer" );
closeDb();
return;
}
enabledCapabilities = mPrimaryKey.isEmpty() ? 0 : ( QgsVectorDataProvider::SelectAtId | QgsVectorDataProvider::SelectGeometryAtId );
if (( mTableBased || mViewBased ) && !mReadOnly )
{
// enabling editing only for Tables [excluding Views and VirtualShapes]
enabledCapabilities |= QgsVectorDataProvider::DeleteFeatures;
if ( !mGeometryColumn.isEmpty() )
enabledCapabilities |= QgsVectorDataProvider::ChangeGeometries;
enabledCapabilities |= QgsVectorDataProvider::ChangeAttributeValues;
enabledCapabilities |= QgsVectorDataProvider::AddFeatures;
enabledCapabilities |= QgsVectorDataProvider::AddAttributes;
}
alreadyDone = false;
#ifdef SPATIALITE_VERSION_GE_4_0_0
if ( lyr )
{
// using the v.4.0 AbstractInterface
if ( !getGeometryDetailsAbstractInterface( lyr ) ) // gets srid and geometry type
{
// the table is not a geometry table
numberFeatures = 0;
QgsDebugMsg( "Invalid SpatiaLite layer" );
closeDb();
gaiaFreeVectorLayersList( list );
return;
}
if ( !getTableSummaryAbstractInterface( lyr ) ) // gets the extent and feature count
{
numberFeatures = 0;
QgsDebugMsg( "Invalid SpatiaLite layer" );
closeDb();
gaiaFreeVectorLayersList( list );
return;
}
// load the columns list
loadFieldsAbstractInterface( lyr );
gaiaFreeVectorLayersList( list );
alreadyDone = true;
}
#endif
if ( !alreadyDone )
{
// using the traditional methods
if ( !getGeometryDetails() ) // gets srid and geometry type
{
// the table is not a geometry table
numberFeatures = 0;
QgsDebugMsg( "Invalid SpatiaLite layer" );
closeDb();
return;
}
if ( !getTableSummary() ) // gets the extent and feature count
{
numberFeatures = 0;
QgsDebugMsg( "Invalid SpatiaLite layer" );
closeDb();
return;
}
// load the columns list
loadFields();
}
if ( !sqliteHandle )
{
QgsDebugMsg( "Invalid SpatiaLite layer" );
return;
}
// retrieve version information
spatialiteVersion();
//fill type names into sets
mNativeTypes
<< QgsVectorDataProvider::NativeType( tr( "Binary object (BLOB)" ), "BLOB", QVariant::ByteArray )
<< QgsVectorDataProvider::NativeType( tr( "Text" ), "TEXT", QVariant::String )
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (double)" ), "FLOAT", QVariant::Double )
<< QgsVectorDataProvider::NativeType( tr( "Whole number (integer)" ), "INTEGER", QVariant::LongLong )
;
valid = true;
}
QgsSpatiaLiteProvider::~QgsSpatiaLiteProvider()
{
closeDb();
}
QgsAbstractFeatureSource* QgsSpatiaLiteProvider::featureSource() const
{
return new QgsSpatiaLiteFeatureSource( this );
}
void QgsSpatiaLiteProvider::updatePrimaryKeyCapabilities()
{
if ( mPrimaryKey.isEmpty() )
{
enabledCapabilities &= ~QgsVectorDataProvider::SelectAtId;
enabledCapabilities &= ~QgsVectorDataProvider::SelectGeometryAtId;
}
else
{
enabledCapabilities |= QgsVectorDataProvider::SelectAtId;
enabledCapabilities |= QgsVectorDataProvider::SelectGeometryAtId;
}
}
#ifdef SPATIALITE_VERSION_GE_4_0_0
// only if libspatialite version is >= 4.0.0
void QgsSpatiaLiteProvider::loadFieldsAbstractInterface( gaiaVectorLayerPtr lyr )
{
if ( !lyr )
return;
attributeFields.clear();
mPrimaryKey.clear(); // cazzo cazzo cazzo
mPrimaryKeyAttrs.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";
}
attributeFields.append( QgsField( name, fieldType, type, 0, 0, "" ) );
}
fld = fld->Next;
}
mPrimaryKey.clear();
mPrimaryKeyAttrs.clear();
QString sql = QString( "PRAGMA table_info(%1)" ).arg( quotedIdentifier( mTableName ) );
char **results;
int rows;
int columns;
char *errMsg = nullptr;
int ret = sqlite3_get_table( sqliteHandle, sql.toUtf8().constData(), &results, &rows, &columns, &errMsg );
if ( ret == SQLITE_OK )
{
for ( int i = 1; i <= rows; i++ )
{
QString name = QString::fromUtf8( results[( i * columns ) + 1] );
QString pk = results[( i * columns ) + 5];
if ( pk.toInt() == 0 )
continue;
if ( mPrimaryKey.isEmpty() )
mPrimaryKey = name;
mPrimaryKeyAttrs << i - 1;
}
}
// for views try to get the primary key from the meta table
if ( mViewBased && mPrimaryKey.isEmpty() )
{
determineViewPrimaryKey();
}
updatePrimaryKeyCapabilities();
sqlite3_free_table( results );
}
#endif
QString QgsSpatiaLiteProvider::spatialiteVersion()
{
if ( mGotSpatialiteVersion )
return mSpatialiteVersionInfo;
int ret;
char **results;
int rows;
int columns;
char *errMsg = nullptr;
QString sql;
sql = "SELECT spatialite_version()";
ret = sqlite3_get_table( sqliteHandle, sql.toUtf8(), &results, &rows, &columns, &errMsg );
if ( ret != SQLITE_OK || rows != 1 )
{
QgsMessageLog::logMessage( tr( "Retrieval of spatialite version failed" ), tr( "SpatiaLite" ) );
return QString::null;
}
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::null;
}
mSpatialiteVersionMajor = spatialiteVersionParts[0].toInt();
mSpatialiteVersionMinor = spatialiteVersionParts[1].toInt();
mGotSpatialiteVersion = true;
return mSpatialiteVersionInfo;
}
void QgsSpatiaLiteProvider::loadFields()
{
int ret;
int i;
sqlite3_stmt *stmt = nullptr;
char **results;
int rows;
int columns;
char *errMsg = nullptr;
QString pkName;
int pkCount = 0;
QString sql;
attributeFields.clear();
if ( !isQuery )
{
mPrimaryKey.clear();
mPrimaryKeyAttrs.clear();
sql = QString( "PRAGMA table_info(%1)" ).arg( quotedIdentifier( mTableName ) );
ret = sqlite3_get_table( sqliteHandle, sql.toUtf8().constData(), &results, &rows, &columns, &errMsg );
if ( ret != SQLITE_OK )
goto error;
if ( rows < 1 )
;
else
{
for ( i = 1; i <= rows; i++ )
{
QString name = QString::fromUtf8( results[( i * columns ) + 1] );
const char *type = results[( i * columns ) + 2];
QString pk = results[( i * columns ) + 5];
if ( pk.toInt() != 0 )
{
// found a Primary Key column
pkCount++;
pkName = name;
mPrimaryKeyAttrs << i - 1;
QgsDebugMsg( "found primaryKey " + name );
}
if ( name.toLower() != mGeometryColumn )
{
// for sure any SQLite value can be represented as SQLITE_TEXT
QVariant::Type fieldType = QVariant::String;
// making some assumptions in order to guess a more realistic type
if ( strcasecmp( type, "int" ) == 0 ||
strcasecmp( type, "integer" ) == 0 ||
strcasecmp( type, "bigint" ) == 0 ||
strcasecmp( type, "smallint" ) == 0 ||
strcasecmp( type, "tinyint" ) == 0 ||
strcasecmp( type, "boolean" ) == 0 )
{
fieldType = QVariant::LongLong;
}
else if ( strcasecmp( type, "real" ) == 0 ||
strcasecmp( type, "double" ) == 0 ||
strcasecmp( type, "double precision" ) == 0 ||
strcasecmp( type, "float" ) == 0 )
{
fieldType = QVariant::Double;
}
attributeFields.append( QgsField( name, fieldType, type, 0, 0, QString() ) );
}
}
}
sqlite3_free_table( results );
// for views try to get the primary key from the meta table
if ( mViewBased && mPrimaryKey.isEmpty() )
{
determineViewPrimaryKey();
}
}
else
{
sql = QString( "select * from %1 limit 1" ).arg( mQuery );
if ( sqlite3_prepare_v2( sqliteHandle, sql.toUtf8().constData(), -1, &stmt, nullptr ) != SQLITE_OK )
{
// some error occurred
QgsMessageLog::logMessage( tr( "SQLite error: %2\nSQL: %1" ).arg( sql, sqlite3_errmsg( sqliteHandle ) ), tr( "SpatiaLite" ) );
return;
}
ret = sqlite3_step( stmt );
if ( ret == SQLITE_DONE )
{
// there are no rows to fetch
sqlite3_finalize( stmt );
return;
}
if ( ret == SQLITE_ROW )
{
// one valid row has been fetched from the result set
columns = sqlite3_column_count( stmt );
for ( i = 0; i < columns; i++ )
{
QString name = QString::fromUtf8( sqlite3_column_name( stmt, i ) );
const char *type = sqlite3_column_decltype( stmt, i );
if ( !type )
type = "TEXT";
if ( name == mPrimaryKey )
{
pkCount++;
pkName = name;
mPrimaryKeyAttrs << i - 1;
QgsDebugMsg( "found primaryKey " + name );
}
if ( name.toLower() != mGeometryColumn )
{
// for sure any SQLite value can be represented as SQLITE_TEXT
QVariant::Type fieldType = QVariant::String;
// making some assumptions in order to guess a more realistic type
if ( strcasecmp( type, "int" ) == 0 ||
strcasecmp( type, "integer" ) == 0 ||
strcasecmp( type, "bigint" ) == 0 ||
strcasecmp( type, "smallint" ) == 0 ||
strcasecmp( type, "tinyint" ) == 0 ||
strcasecmp( type, "boolean" ) == 0 )
{
fieldType = QVariant::LongLong;
}
else if ( strcasecmp( type, "real" ) == 0 ||
strcasecmp( type, "double" ) == 0 ||
strcasecmp( type, "double precision" ) == 0 ||
strcasecmp( type, "float" ) == 0 )
{
fieldType = QVariant::Double;
}
attributeFields.append( QgsField( name, fieldType, type, 0, 0, QString() ) );
}
}
}
sqlite3_finalize( stmt );
}
if ( pkCount == 1 )
{
// setting the Primary Key column name
mPrimaryKey = pkName;
}
updatePrimaryKeyCapabilities();
return;
error:
QgsMessageLog::logMessage( tr( "SQLite error: %2\nSQL: %1" ).arg( sql, errMsg ? errMsg : tr( "unknown cause" ) ), tr( "SpatiaLite" ) );
// unexpected error
if ( errMsg )
{
sqlite3_free( errMsg );
}
}
void QgsSpatiaLiteProvider::determineViewPrimaryKey()
{
QString sql = QString( "SELECT view_rowid"
" FROM views_geometry_columns"
" WHERE upper(view_name) = upper(%1) and upper(view_geometry) = upper(%2)" ).arg( quotedValue( mTableName ),
quotedValue( mGeometryColumn ) );
char **results;
int rows;
int columns;
char *errMsg = nullptr;
int ret = sqlite3_get_table( sqliteHandle, sql.toUtf8().constData(), &results, &rows, &columns, &errMsg );
if ( ret == SQLITE_OK )
{
if ( rows > 0 )
{
mPrimaryKey = results[1 * columns];
int idx = attributeFields.fieldNameIndex( mPrimaryKey );
if ( idx != -1 )
mPrimaryKeyAttrs << idx;
}
sqlite3_free_table( results );
}
}
bool QgsSpatiaLiteProvider::hasTriggers()
{
int ret;
char **results;
int rows;
int columns;
char *errMsg = nullptr;
QString sql;
sql = QString( "SELECT * FROM sqlite_master WHERE type='trigger' AND tbl_name=%1" )
.arg( quotedIdentifier( mTableName ) );
ret = sqlite3_get_table( sqliteHandle, sql.toUtf8().constData(), &results, &rows, &columns, &errMsg );
sqlite3_free_table( results );
return ( ret == SQLITE_OK && rows > 0 );
}
QString QgsSpatiaLiteProvider::storageType() const
{
return "SQLite database with SpatiaLite extension";
}
QgsFeatureIterator QgsSpatiaLiteProvider::getFeatures( const QgsFeatureRequest& request )
{
if ( !valid )
{
QgsDebugMsg( "Read attempt on an invalid SpatiaLite data source" );
return QgsFeatureIterator();
}
return QgsFeatureIterator( new QgsSpatiaLiteFeatureIterator( new QgsSpatiaLiteFeatureSource( this ), true, request ) );
}
int QgsSpatiaLiteProvider::computeSizeFromGeosWKB2D( const unsigned char *blob,
int size, int type, int nDims,
int little_endian, int endian_arch )
{
Q_UNUSED( size );
// calculating the size required to store this WKB
int rings;
int points;
int ib;
const unsigned char *p_in = blob + 5;
int gsize = 5;
switch ( type )
{
// compunting the required size
case GAIA_POINT:
switch ( nDims )
{
case GAIA_XY_Z_M:
gsize += 4 * sizeof( double );
break;
case GAIA_XY_M:
case GAIA_XY_Z:
gsize += 3 * sizeof( double );
break;
default:
gsize += 2 * sizeof( double );
break;
}
break;
case GAIA_LINESTRING:
points = gaiaImport32( p_in, little_endian, endian_arch );
gsize += 4;
switch ( nDims )
{
case GAIA_XY_Z_M:
gsize += points * ( 4 * sizeof( double ) );
break;
case GAIA_XY_M:
case GAIA_XY_Z:
gsize += points * ( 3 * sizeof( double ) );
break;