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connector.py
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connector.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
Name : DB Manager
Description : Database manager plugin for QGIS
Date : Oct 14 2016
copyright : (C) 2016 by Even Rouault
(C) 2011 by Giuseppe Sucameli
email : even.rouault at spatialys.com
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
"""
from builtins import str
from functools import cmp_to_key
from qgis.PyQt.QtWidgets import QApplication
from qgis.PyQt.QtCore import QThread
from ..connector import DBConnector
from ..plugin import ConnectionError, DbError, Table
from qgis.utils import spatialite_connect
from qgis.core import QgsApplication
import sqlite3
from osgeo import gdal, ogr, osr
def classFactory():
return GPKGDBConnector
class GPKGDBConnector(DBConnector):
def __init__(self, uri):
DBConnector.__init__(self, uri)
self.dbname = uri.database()
self.has_raster = False
self.mapSridToName = {}
self._opendb()
def _opendb(self):
# Keep this explicit assignment to None to make sure the file is
# properly closed before being re-opened
self.gdal_ds = None
self.gdal_ds = gdal.OpenEx(self.dbname, gdal.OF_UPDATE)
if self.gdal_ds is None:
self.gdal_ds = gdal.OpenEx(self.dbname)
if self.gdal_ds is None:
raise ConnectionError(QApplication.translate("DBManagerPlugin", '"{0}" not found').format(self.dbname))
if self.gdal_ds.GetDriver().ShortName != 'GPKG':
raise ConnectionError(QApplication.translate("DBManagerPlugin", '"{dbname}" not recognized as GPKG ({shortname} reported instead.)').format(dbname=self.dbname, shortname=self.gdal_ds.GetDriver().ShortName))
self.has_raster = self.gdal_ds.RasterCount != 0 or self.gdal_ds.GetMetadata('SUBDATASETS') is not None
self.connection = None
self._current_thread = None
@property
def connection(self):
"""Creates and returns a spatialite connection, if
the existing connection was created in another thread
invalidates it and create a new one.
"""
if self._connection is None or self._current_thread != int(QThread.currentThreadId()):
self._current_thread = int(QThread.currentThreadId())
try:
self._connection = spatialite_connect(str(self.dbname))
except self.connection_error_types() as e:
raise ConnectionError(e)
return self._connection
@connection.setter
def connection(self, conn):
self._connection = conn
def unquoteId(self, quotedId):
if len(quotedId) <= 2 or quotedId[0] != '"' or quotedId[len(quotedId) - 1] != '"':
return quotedId
unquoted = ''
i = 1
while i < len(quotedId) - 1:
if quotedId[i] == '"' and quotedId[i + 1] == '"':
unquoted += '"'
i += 2
else:
unquoted += quotedId[i]
i += 1
return unquoted
def _fetchOne(self, sql):
sql_lyr = self.gdal_ds.ExecuteSQL(sql)
if sql_lyr is None:
return None
f = sql_lyr.GetNextFeature()
if f is None:
ret = None
else:
ret = [f.GetField(i) for i in range(f.GetFieldCount())]
self.gdal_ds.ReleaseResultSet(sql_lyr)
return ret
def _fetchAll(self, sql, include_fid_and_geometry=False):
sql_lyr = self.gdal_ds.ExecuteSQL(sql)
if sql_lyr is None:
return None
ret = []
while True:
f = sql_lyr.GetNextFeature()
if f is None:
break
else:
if include_fid_and_geometry:
field_vals = [f.GetFID()]
if sql_lyr.GetLayerDefn().GetGeomType() != ogr.wkbNone:
geom = f.GetGeometryRef()
if geom is not None:
geom = geom.ExportToWkt()
field_vals += [geom]
field_vals += [f.GetField(i) for i in range(f.GetFieldCount())]
ret.append(field_vals)
else:
ret.append([f.GetField(i) for i in range(f.GetFieldCount())])
self.gdal_ds.ReleaseResultSet(sql_lyr)
return ret
def _fetchAllFromLayer(self, table):
lyr = self.gdal_ds.GetLayerByName(table.name)
if lyr is None:
return []
lyr.ResetReading()
ret = []
while True:
f = lyr.GetNextFeature()
if f is None:
break
else:
field_vals = [f.GetFID()]
if lyr.GetLayerDefn().GetGeomType() != ogr.wkbNone:
geom = f.GetGeometryRef()
if geom is not None:
geom = geom.ExportToWkt()
field_vals += [geom]
field_vals += [f.GetField(i) for i in range(f.GetFieldCount())]
ret.append(field_vals)
return ret
def _execute_and_commit(self, sql):
sql_lyr = self.gdal_ds.ExecuteSQL(sql)
self.gdal_ds.ReleaseResultSet(sql_lyr)
def _execute(self, cursor, sql):
if self.connection is None:
# Needed when evaluating a SQL query
try:
self.connection = spatialite_connect(str(self.dbname))
except self.connection_error_types() as e:
raise ConnectionError(e)
return DBConnector._execute(self, cursor, sql)
def _commit(self):
if self.connection is None:
return
try:
self.connection.commit()
except self.connection_error_types() as e:
raise ConnectionError(e)
except self.execution_error_types() as e:
# do the rollback to avoid a "current transaction aborted, commands ignored" errors
self._rollback()
raise DbError(e)
def cancel(self):
if self.connection:
self.connection.interrupt()
@classmethod
def isValidDatabase(cls, path):
if hasattr(gdal, 'OpenEx'):
ds = gdal.OpenEx(path)
if ds is None or ds.GetDriver().ShortName != 'GPKG':
return False
else:
ds = ogr.Open(path)
if ds is None or ds.GetDriver().GetName() != 'GPKG':
return False
return True
def getInfo(self):
return None
def getSpatialInfo(self):
return None
def hasSpatialSupport(self):
return True
# Used by DlgTableProperties
def canAddGeometryColumn(self, table):
_, tablename = self.getSchemaTableName(table)
lyr = self.gdal_ds.GetLayerByName(tablename)
if lyr is None:
return False
return lyr.GetGeomType() == ogr.wkbNone
# Used by DlgTableProperties
def canAddSpatialIndex(self, table):
_, tablename = self.getSchemaTableName(table)
lyr = self.gdal_ds.GetLayerByName(tablename)
if lyr is None or lyr.GetGeometryColumn() == '':
return False
return not self.hasSpatialIndex(table,
lyr.GetGeometryColumn())
def hasRasterSupport(self):
return self.has_raster
def hasCustomQuerySupport(self):
return True
def hasTableColumnEditingSupport(self):
return True
def hasCreateSpatialViewSupport(self):
return False
def fieldTypes(self):
# From "Table 1. GeoPackage Data Types" (http://www.geopackage.org/spec/)
return [
"TEXT",
"MEDIUMINT",
"INTEGER",
"TINYINT",
"SMALLINT",
"DOUBLE",
"FLOAT"
"DATE",
"DATETIME",
"BOOLEAN",
]
def getSchemas(self):
return None
def getTables(self, schema=None, add_sys_tables=False):
""" get list of tables """
items = []
try:
vectors = self.getVectorTables(schema)
for tbl in vectors:
items.append(tbl)
except DbError:
pass
try:
rasters = self.getRasterTables(schema)
for tbl in rasters:
items.append(tbl)
except DbError:
pass
for i, tbl in enumerate(items):
tbl.insert(3, False) # not system table
return sorted(items, key=cmp_to_key(lambda x, y: (x[1] > y[1]) - (x[1] < y[1])))
def getVectorTables(self, schema=None):
items = []
for i in range(self.gdal_ds.GetLayerCount()):
lyr = self.gdal_ds.GetLayer(i)
geomtype = lyr.GetGeomType()
if hasattr(ogr, 'GT_Flatten'):
geomtype_flatten = ogr.GT_Flatten(geomtype)
else:
geomtype_flatten = geomtype
geomname = 'GEOMETRY'
if geomtype_flatten == ogr.wkbPoint:
geomname = 'POINT'
elif geomtype_flatten == ogr.wkbLineString:
geomname = 'LINESTRING'
elif geomtype_flatten == ogr.wkbPolygon:
geomname = 'POLYGON'
elif geomtype_flatten == ogr.wkbMultiPoint:
geomname = 'MULTIPOINT'
elif geomtype_flatten == ogr.wkbMultiLineString:
geomname = 'MULTILINESTRING'
elif geomtype_flatten == ogr.wkbMultiPolygon:
geomname = 'MULTIPOLYGON'
elif geomtype_flatten == ogr.wkbGeometryCollection:
geomname = 'GEOMETRYCOLLECTION'
elif geomtype_flatten == ogr.wkbCircularString:
geomname = 'CIRCULARSTRING'
elif geomtype_flatten == ogr.wkbCompoundCurve:
geomname = 'COMPOUNDCURVE'
elif geomtype_flatten == ogr.wkbCurvePolygon:
geomname = 'CURVEPOLYGON'
elif geomtype_flatten == ogr.wkbMultiCurve:
geomname = 'MULTICURVE'
elif geomtype_flatten == ogr.wkbMultiSurface:
geomname = 'MULTISURFACE'
geomdim = 'XY'
if hasattr(ogr, 'GT_HasZ') and ogr.GT_HasZ(lyr.GetGeomType()):
geomdim += 'Z'
if hasattr(ogr, 'GT_HasM') and ogr.GT_HasM(lyr.GetGeomType()):
geomdim += 'M'
srs = lyr.GetSpatialRef()
srid = None
if srs is not None:
if srs.IsProjected():
name = srs.GetAttrValue('PROJCS', 0)
elif srs.IsGeographic():
name = srs.GetAttrValue('GEOGCS', 0)
else:
name = None
srid = srs.GetAuthorityCode(None)
if srid is not None:
srid = int(srid)
else:
srid = self._fetchOne('SELECT srid FROM gpkg_spatial_ref_sys WHERE table_name = %s' % self.quoteString(lyr.GetName()))
if srid is not None:
srid = int(srid)
self.mapSridToName[srid] = name
if geomtype == ogr.wkbNone:
item = list([Table.TableType,
lyr.GetName(),
False, # is_view
])
else:
item = list([Table.VectorType,
lyr.GetName(),
False, # is_view
lyr.GetName(),
lyr.GetGeometryColumn(),
geomname,
geomdim,
srid])
items.append(item)
return items
def getRasterTables(self, schema=None):
""" get list of table with a geometry column
it returns:
name (table name)
type = 'view' (is a view?)
geometry_column:
r.table_name (the prefix table name, use this to load the layer)
r.geometry_column
srid
"""
sql = u"""SELECT table_name, 0 AS is_view, table_name AS r_table_name, '' AS r_geometry_column, srs_id FROM gpkg_contents WHERE data_type = 'tiles'"""
ret = self._fetchAll(sql)
if ret is None:
return []
items = []
for i, tbl in enumerate(ret):
item = list(tbl)
item.insert(0, Table.RasterType)
items.append(item)
return items
def getTableRowCount(self, table):
lyr = self.gdal_ds.GetLayerByName(self.getSchemaTableName(table)[1])
return lyr.GetFeatureCount() if lyr is not None else None
def getTableFields(self, table):
""" return list of columns in table """
sql = u"PRAGMA table_info(%s)" % (self.quoteId(table))
ret = self._fetchAll(sql)
if ret is None:
ret = []
return ret
def getTableIndexes(self, table):
""" get info about table's indexes """
sql = u"PRAGMA index_list(%s)" % (self.quoteId(table))
indexes = self._fetchAll(sql)
if indexes is None:
return []
for i, idx in enumerate(indexes):
# sqlite has changed the number of columns returned by index_list since 3.8.9
# I am not using self.getInfo() here because this behavior
# can be changed back without notice as done for index_info, see:
# http://repo.or.cz/sqlite.git/commit/53555d6da78e52a430b1884b5971fef33e9ccca4
if len(idx) == 3:
num, name, unique = idx
if len(idx) == 5:
num, name, unique, createdby, partial = idx
sql = u"PRAGMA index_info(%s)" % (self.quoteId(name))
idx = [num, name, unique]
cols = []
for seq, cid, cname in self._fetchAll(sql):
cols.append(cid)
idx.append(cols)
indexes[i] = idx
return indexes
def getTableConstraints(self, table):
return None
def getTableTriggers(self, table):
_, tablename = self.getSchemaTableName(table)
# Do not list rtree related triggers as we don't want them to be dropped
sql = u"SELECT name, sql FROM sqlite_master WHERE tbl_name = %s AND type = 'trigger'" % (self.quoteString(tablename))
if self.isVectorTable(table):
sql += u" AND name NOT LIKE 'rtree_%%'"
elif self.isRasterTable(table):
sql += u" AND name NOT LIKE '%%_zoom_insert'"
sql += u" AND name NOT LIKE '%%_zoom_update'"
sql += u" AND name NOT LIKE '%%_tile_column_insert'"
sql += u" AND name NOT LIKE '%%_tile_column_update'"
sql += u" AND name NOT LIKE '%%_tile_row_insert'"
sql += u" AND name NOT LIKE '%%_tile_row_update'"
return self._fetchAll(sql)
def deleteTableTrigger(self, trigger, table=None):
""" delete trigger """
sql = u"DROP TRIGGER %s" % self.quoteId(trigger)
self._execute_and_commit(sql)
def getTableExtent(self, table, geom, force=False):
""" find out table extent """
_, tablename = self.getSchemaTableName(table)
if self.isRasterTable(table):
md = self.gdal_ds.GetMetadata('SUBDATASETS')
if md is None or len(md) == 0:
ds = self.gdal_ds
else:
subdataset_name = 'GPKG:%s:%s' % (self.gdal_ds.GetDescription(), tablename)
ds = gdal.Open(subdataset_name)
if ds is None:
return None
gt = ds.GetGeoTransform()
minx = gt[0]
maxx = gt[0] + gt[1] * ds.RasterYSize
maxy = gt[3]
miny = gt[3] + gt[5] * ds.RasterYSize
return (minx, miny, maxx, maxy)
lyr = self.gdal_ds.GetLayerByName(tablename)
if lyr is None:
return None
ret = lyr.GetExtent(force=force, can_return_null=True)
if ret is None:
return None
minx, maxx, miny, maxy = ret
return (minx, miny, maxx, maxy)
def getViewDefinition(self, view):
""" returns definition of the view """
return None
def getSpatialRefInfo(self, srid):
if srid in self.mapSridToName:
return self.mapSridToName[srid]
sql = u"SELECT srs_name FROM gpkg_spatial_ref_sys WHERE srs_id = %s" % self.quoteString(srid)
res = self._fetchOne(sql)
if res is not None:
res = res[0]
self.mapSridToName[srid] = res
return res
def isVectorTable(self, table):
_, tablename = self.getSchemaTableName(table)
return self.gdal_ds.GetLayerByName(tablename) is not None
def isRasterTable(self, table):
if self.has_raster and not self.isVectorTable(table):
_, tablename = self.getSchemaTableName(table)
md = self.gdal_ds.GetMetadata('SUBDATASETS')
if md is None or len(md) == 0:
sql = u"SELECT COUNT(*) FROM gpkg_contents WHERE data_type = 'tiles' AND table_name = %s" % self.quoteString(tablename)
ret = self._fetchOne(sql)
return ret is not None and ret[0] == 1
else:
subdataset_name = 'GPKG:%s:%s' % (self.gdal_ds.GetDescription(), tablename)
for key in md:
if md[key] == subdataset_name:
return True
return False
def getOGRFieldTypeFromSQL(self, sql_type):
ogr_type = ogr.OFTString
ogr_subtype = ogr.OFSTNone
width = 0
if not sql_type.startswith('TEXT ('):
pos = sql_type.find(' (')
if pos >= 0:
sql_type = sql_type[0:pos]
if sql_type == 'BOOLEAN':
ogr_type = ogr.OFTInteger
ogr_subtype = ogr.OFSTBoolean
elif sql_type in ('TINYINT', 'SMALLINT', 'MEDIUMINT'):
ogr_type = ogr.OFTInteger
elif sql_type == 'INTEGER':
ogr_type = ogr.OFTInteger64
elif sql_type == 'FLOAT':
ogr_type = ogr.OFTReal
ogr_subtype = ogr.OFSTFloat32
elif sql_type == 'DOUBLE':
ogr_type = ogr.OFTReal
elif sql_type == 'DATE':
ogr_type = ogr.OFTDate
elif sql_type == 'DATETIME':
ogr_type = ogr.OFTDateTime
elif sql_type.startswith('TEXT (') and sql_type.endswith(')'):
width = int(sql_type[len('TEXT ('):-1])
return (ogr_type, ogr_subtype, width)
def createOGRFieldDefnFromSQL(self, sql_fielddef):
f_split = sql_fielddef.split(' ')
quoted_name = f_split[0]
name = self.unquoteId(quoted_name)
sql_type = f_split[1].upper()
if len(f_split) >= 3 and f_split[2].startswith('(') and f_split[2].endswith(')'):
sql_type += ' ' + f_split[2]
f_split = [f for f in f_split[3:]]
else:
f_split = [f for f in f_split[2:]]
ogr_type, ogr_subtype, width = self.getOGRFieldTypeFromSQL(sql_type)
fld_defn = ogr.FieldDefn(name, ogr_type)
fld_defn.SetSubType(ogr_subtype)
fld_defn.SetWidth(width)
if len(f_split) >= 2 and f_split[0] == 'NOT' and f_split[1] == 'NULL':
fld_defn.SetNullable(False)
f_split = [f for f in f_split[2:]]
elif len(f_split) >= 1:
f_split = [f for f in f_split[1:]]
if len(f_split) >= 2 and f_split[0] == 'DEFAULT':
new_default = f_split[1]
if new_default == '':
fld_defn.SetDefault(None)
elif new_default == 'NULL' or ogr_type in (ogr.OFTInteger, ogr.OFTReal):
fld_defn.SetDefault(new_default)
elif new_default.startswith("'") and new_default.endswith("'"):
fld_defn.SetDefault(new_default)
else:
fld_defn.SetDefault(self.quoteString(new_default))
return fld_defn
def createTable(self, table, field_defs, pkey):
""" create ordinary table
'fields' is array containing field definitions
'pkey' is the primary key name
"""
if len(field_defs) == 0:
return False
options = []
if pkey is not None and pkey != "":
options += ['FID=' + pkey]
_, tablename = self.getSchemaTableName(table)
lyr = self.gdal_ds.CreateLayer(tablename, geom_type=ogr.wkbNone, options=options)
if lyr is None:
return False
for field_def in field_defs:
fld_defn = self.createOGRFieldDefnFromSQL(field_def)
if fld_defn.GetName() == pkey:
continue
if lyr.CreateField(fld_defn) != 0:
return False
return True
def deleteTable(self, table):
""" delete table from the database """
if self.isRasterTable(table):
return False
_, tablename = self.getSchemaTableName(table)
for i in range(self.gdal_ds.GetLayerCount()):
if self.gdal_ds.GetLayer(i).GetName() == tablename:
return self.gdal_ds.DeleteLayer(i) == 0
return False
def emptyTable(self, table):
""" delete all rows from table """
if self.isRasterTable(table):
return False
sql = u"DELETE FROM %s" % self.quoteId(table)
self._execute_and_commit(sql)
def renameTable(self, table, new_table):
"""Renames the table
:param table: tuple with schema and table names
:type table: tuple (str, str)
:param new_table: new table name
:type new_table: str
:return: true on success
:rtype: bool
"""
table_name = table[1]
provider = [p for p in QgsApplication.dataItemProviderRegistry().providers() if p.name() == 'OGR'][0]
collection_item = provider.createDataItem(self.dbname, None)
data_item = [c for c in collection_item.createChildren() if c.name() == table_name][0]
result = data_item.rename(new_table)
# we need to reopen after renaming since OGR doesn't update its
# internal state
if result:
self._opendb()
return result
def moveTable(self, table, new_table, new_schema=None):
return self.renameTable(table, new_table)
def runVacuum(self):
""" run vacuum on the db """
self._execute_and_commit("VACUUM")
def addTableColumn(self, table, field_def):
""" add a column to table """
_, tablename = self.getSchemaTableName(table)
lyr = self.gdal_ds.GetLayerByName(tablename)
if lyr is None:
return False
fld_defn = self.createOGRFieldDefnFromSQL(field_def)
return lyr.CreateField(fld_defn) == 0
def deleteTableColumn(self, table, column):
""" delete column from a table """
if self.isGeometryColumn(table, column):
return False
_, tablename = self.getSchemaTableName(table)
lyr = self.gdal_ds.GetLayerByName(tablename)
if lyr is None:
return False
idx = lyr.GetLayerDefn().GetFieldIndex(column)
if idx >= 0:
return lyr.DeleteField(idx) == 0
return False
def updateTableColumn(self, table, column, new_name, new_data_type=None, new_not_null=None, new_default=None, comment=None):
if self.isGeometryColumn(table, column):
return False
_, tablename = self.getSchemaTableName(table)
lyr = self.gdal_ds.GetLayerByName(tablename)
if lyr is None:
return False
if lyr.TestCapability(ogr.OLCAlterFieldDefn) == 0:
return False
idx = lyr.GetLayerDefn().GetFieldIndex(column)
if idx >= 0:
old_fielddefn = lyr.GetLayerDefn().GetFieldDefn(idx)
flag = 0
if new_name is not None:
flag |= ogr.ALTER_NAME_FLAG
else:
new_name = column
if new_data_type is None:
ogr_type = old_fielddefn.GetType()
ogr_subtype = old_fielddefn.GetSubType()
width = old_fielddefn.GetWidth()
else:
flag |= ogr.ALTER_TYPE_FLAG
flag |= ogr.ALTER_WIDTH_PRECISION_FLAG
ogr_type, ogr_subtype, width = self.getOGRFieldTypeFromSQL(new_data_type)
new_fielddefn = ogr.FieldDefn(new_name, ogr_type)
new_fielddefn.SetSubType(ogr_subtype)
new_fielddefn.SetWidth(width)
if new_default is not None:
flag |= ogr.ALTER_DEFAULT_FLAG
if new_default == '':
new_fielddefn.SetDefault(None)
elif new_default == 'NULL' or ogr_type in (ogr.OFTInteger, ogr.OFTReal):
new_fielddefn.SetDefault(str(new_default))
elif new_default.startswith("'") and new_default.endswith("'"):
new_fielddefn.SetDefault(str(new_default))
else:
new_fielddefn.SetDefault(self.quoteString(new_default))
else:
new_fielddefn.SetDefault(old_fielddefn.GetDefault())
if new_not_null is not None:
flag |= ogr.ALTER_NULLABLE_FLAG
new_fielddefn.SetNullable(not new_not_null)
else:
new_fielddefn.SetNullable(old_fielddefn.IsNullable())
return lyr.AlterFieldDefn(idx, new_fielddefn, flag) == 0
return False
def isGeometryColumn(self, table, column):
_, tablename = self.getSchemaTableName(table)
lyr = self.gdal_ds.GetLayerByName(tablename)
if lyr is None:
return False
return column == lyr.GetGeometryColumn()
def addGeometryColumn(self, table, geom_column='geometry', geom_type='POINT', srid=-1, dim=2):
_, tablename = self.getSchemaTableName(table)
lyr = self.gdal_ds.GetLayerByName(tablename)
if lyr is None:
return False
ogr_type = ogr.wkbUnknown
if geom_type == 'POINT':
ogr_type = ogr.wkbPoint
elif geom_type == 'LINESTRING':
ogr_type = ogr.wkbLineString
elif geom_type == 'POLYGON':
ogr_type = ogr.wkbPolygon
elif geom_type == 'MULTIPOINT':
ogr_type = ogr.wkbMultiPoint
elif geom_type == 'MULTILINESTRING':
ogr_type = ogr.wkbMultiLineString
elif geom_type == 'MULTIPOLYGON':
ogr_type = ogr.wkbMultiPolygon
elif geom_type == 'GEOMETRYCOLLECTION':
ogr_type = ogr.wkbGeometryCollection
if dim == 3:
ogr_type = ogr_type | ogr.wkb25DBit
elif dim == 4:
if hasattr(ogr, 'GT_HasZ'):
ogr_type = ogr.GT_SetZ(ogr_type)
else:
ogr_type = ogr_type | ogr.wkb25DBit
if hasattr(ogr, 'GT_HasM'):
ogr_type = ogr.GT_SetM(ogr_type)
geom_field_defn = ogr.GeomFieldDefn(self.unquoteId(geom_column), ogr_type)
if srid > 0:
sr = osr.SpatialReference()
if sr.ImportFromEPSG(srid) == 0:
geom_field_defn.SetSpatialRef(sr)
if lyr.CreateGeomField(geom_field_defn) != 0:
return False
self._opendb()
return True
def deleteGeometryColumn(self, table, geom_column):
return False # not supported
def addTableUniqueConstraint(self, table, column):
""" add a unique constraint to a table """
return False # constraints not supported
def deleteTableConstraint(self, table, constraint):
""" delete constraint in a table """
return False # constraints not supported
def addTablePrimaryKey(self, table, column):
""" add a primery key (with one column) to a table """
sql = u"ALTER TABLE %s ADD PRIMARY KEY (%s)" % (self.quoteId(table), self.quoteId(column))
self._execute_and_commit(sql)
def createTableIndex(self, table, name, column, unique=False):
""" create index on one column using default options """
unique_str = u"UNIQUE" if unique else ""
sql = u"CREATE %s INDEX %s ON %s (%s)" % (
unique_str, self.quoteId(name), self.quoteId(table), self.quoteId(column))
self._execute_and_commit(sql)
def deleteTableIndex(self, table, name):
schema, tablename = self.getSchemaTableName(table)
sql = u"DROP INDEX %s" % self.quoteId((schema, name))
self._execute_and_commit(sql)
def createSpatialIndex(self, table, geom_column):
if self.isRasterTable(table):
return False
_, tablename = self.getSchemaTableName(table)
sql = u"SELECT CreateSpatialIndex(%s, %s)" % (
self.quoteId(tablename), self.quoteId(geom_column))
res = self._fetchOne(sql)
return res is not None and res[0] == 1
def deleteSpatialIndex(self, table, geom_column):
if self.isRasterTable(table):
return False
_, tablename = self.getSchemaTableName(table)
sql = u"SELECT DisableSpatialIndex(%s, %s)" % (
self.quoteId(tablename), self.quoteId(geom_column))
res = self._fetchOne(sql)
return res is not None and res[0] == 1
def hasSpatialIndex(self, table, geom_column):
if self.isRasterTable(table) or geom_column is None:
return False
_, tablename = self.getSchemaTableName(table)
# (only available in >= 2.1.2)
sql = u"SELECT HasSpatialIndex(%s, %s)" % (self.quoteString(tablename), self.quoteString(geom_column))
gdal.PushErrorHandler()
ret = self._fetchOne(sql)
gdal.PopErrorHandler()
if ret is None:
# might be the case for GDAL < 2.1.2
sql = u"SELECT COUNT(*) FROM sqlite_master WHERE type = 'table' AND name LIKE %s" % self.quoteString("%%rtree_" + tablename + "_%%")
ret = self._fetchOne(sql)
if ret is None:
return False
else:
return ret[0] >= 1
def execution_error_types(self):
return sqlite3.Error, sqlite3.ProgrammingError, sqlite3.Warning
def connection_error_types(self):
return sqlite3.InterfaceError, sqlite3.OperationalError
def getSqlDictionary(self):
from .sql_dictionary import getSqlDictionary
sql_dict = getSqlDictionary()
items = []
for tbl in self.getTables():
items.append(tbl[1]) # table name
for fld in self.getTableFields(tbl[0]):
items.append(fld[1]) # field name
sql_dict["identifier"] = items
return sql_dict
def getQueryBuilderDictionary(self):
from .sql_dictionary import getQueryBuilderDictionary
return getQueryBuilderDictionary()