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# -*- coding: latin1 -*-
#
# - contient un accès à un modèle base de donnée sous forme de QSqlTableModel, vu par QTableView
# et un deuxième CategoryItemModel(QAbstractProxyModel) vu par QTreeView
# utilise directement SQL (via un groupe de QSqlQuery)
#
# - WARN : ne tourne que sous Python 2.7.1 et PyQt v4.8.3
#
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtSql import *
ID = 0
ID_PARENT = 1
NAME = 2
import logging
logging.basicConfig(level=logging.DEBUG,
format="%(asctime)s [%(levelname)s]: %(message)s",
datefmt="%Y.%m.%d/%H:%M:%S",
filename='zz-sql2-test.log',
filemode='a')
console = logging.StreamHandler()
# console.setLevel(logging.DEBUG)
console.setLevel(logging.WARN)
# add the handler to the root logger
logging.getLogger('').addHandler(console)
# -- -- -- -- -- -- -- -- --
# -- A central object to locate a node within the tree -- --
# -- -- -- -- -- -- -- -- --
class Mapping(QObject):
def __init__(self, owner, id, childPos, parentId, name, inTable=False):
"""
An object to store information about a node:
id = it's logical id
parentId = id-logique du noeud parent de la ligne key
name = the name value (only for debug)
inTable = say if childPos concern the TableView (or the Tree !)
"""
super(Mapping, self).__init__(owner)
self.owner = owner # -- never used ? But necessary for PyQt QObject ! --
self.id = id
self.childPos = childPos # -- the position of id in its parent --
self.parentId = parentId # -- the parentId of this id
self.name = name # -- the name of this id
self.inTable = inTable # -- a flag to say if childPos is relative to the Table
def __repr__(self):
return "Mapping(%d,%d,%d,%s,%s)" % (self.id, self.childPos, self.parentId, self.name, self.inTable)
def isValid(self):
# -- for strange situation -- A shadow object may exists, without attributes ~ --
return hasattr(self, 'id')
# -- -- -- -- -- -- -- -- --
class CategoryItemModel(QAbstractProxyModel):
def __init__(self, db, parent):
super(CategoryItemModel, self).__init__(parent)
self.m_db = db
self.parent = parent
def select(self):
# -- Prepare some queries: --
self.query_children_count = QSqlQuery( self.m_db )
self.query_children_count.prepare( "SELECT count(*) FROM subjects WHERE parent_id = :pid")
self.query_children_id = QSqlQuery( self.m_db )
self.query_children_id.prepare( "SELECT id, parent_id, name FROM subjects "
"WHERE parent_id = :pid ORDER BY id")
self.query_parent_id = QSqlQuery( self.m_db )
self.query_parent_id.prepare( "SELECT parent_id, name FROM subjects WHERE id = :chid" )
# -- @UPD@ this is only for the DEMONSTRATION ; very BAD design ! --
self.query_element_ix = QSqlQuery( self.m_db )
self.query_element_ix.prepare( "SELECT id, parent_id, name FROM subjects ORDER BY id")
# -- Prepare a root element, to use model.createIndex(row, col, XXX) to access source info --
model = self.sourceModel()
self.rootIx = model.createIndex(-1,-1,None) # -- always used to access data in rootModel --
# -- Reset the layout
self.reset()
logging.info('%s.select(): end of reset()' % (self.__class__.__name__))
def _get_children_count_(self, pid):
# -- query about number of children for a parentid ; used with row_count() --
self.query_children_count.bindValue(":pid", pid)
self.query_children_count.exec_()
self.query_children_count.next()
if self.query_children_count.isValid():
children_count, fg_OK = self.query_children_count.value(0).toInt()
else:
children_count = 0
logging.debug("_get_children_count_(%d) -> %d", pid, children_count)
return children_count
def _get_child_data_(self, chpos, pid):
# -- use SQL to found the child data from its parentId and its relative row --
# -- very BAD DESIGN, but allow test of it ! --
self.query_children_id.bindValue(":pid", pid)
self.query_children_id.exec_()
xch = 0
qname = None
while self.query_children_id.next():
if xch == chpos:
qid, fg_OK = self.query_children_id.value(0).toInt()
# -- qpid, fg_OK = self.query_children_id.value(1).toInt()
qname = self.query_children_id.value(2).toString()
break
xch += 1
if qname is None:
qid = -1
xch = -1
qname = "[???]"
rval = Mapping(self, qid, xch, pid, qname, False)
logging.debug("_get_child_data_(%d, %d) -> %s", chpos, pid, repr(rval))
return rval
def _get_child_row_(self, id):
# -- use SQL to found the parent and its relative row --
parentId = self._get_parent_row_(id)
if parentId < 0:
logging.debug("_get_child_row_(%d) -> None (because pid=%d)", id, parentId)
return None
self.query_children_id.bindValue(":pid", parentId)
self.query_children_id.exec_()
xelm = 0
qname = None
while self.query_children_id.next():
qid, fg_OK = self.query_children_id.value(0).toInt()
# qname = self.query_children_id.value(2).toString()
# ldebug.append((qid, qname))
if qid == id:
qname = self.query_children_id.value(2).toString()
break
xelm += 1
if qname is None:
qid = -1
qname = "[???]"
rval = Mapping(self, qid, xelm, parentId, qname, False)
logging.debug("_get_child_row_(%d) -> %s", id, repr(rval))
return rval
def _get_parent_row_(self, id):
# -- use SQL to found the parent of child-id == id --
self.query_parent_id.bindValue(":chid", id)
self.query_parent_id.exec_()
if self.query_parent_id.lastError().isValid():
logging.warn("_get_parent_row_ has last error: %s" % (self.query_parent_id.lastError()))
if self.query_parent_id.next():
parentId, fg_OK = self.query_parent_id.value(0).toInt()
parentName = self.query_parent_id.value(1).toString()
else:
parentId = -2
return parentId
def _get_table_row_(self, id):
# -- use SQL to found the relative row to the full table --
# -- WARN : unefficient way !! --
self.query_element_ix.exec_()
if self.query_element_ix.lastError().isValid():
print "DUMP: query_element_ix has last error: %s" % (self.query_element_ix.lastError())
xelm = 0
qname = None
while self.query_element_ix.next():
qid, fg_OK = self.query_element_ix.value(0).toInt()
qname = self.query_element_ix.value(2).toString()
if qid == id:
qparentId, fg_OK = self.query_element_ix.value(1).toInt()
break
xelm += 1
qname = None
if qname is None:
qid = -1
qname = "[???]"
rval = Mapping(self, qid, xelm, qparentId, qname, True)
logging.debug("_get_table_row_(%d) -> %s", id, repr(rval))
return rval
def flags(self, index):
defaultFlags = QAbstractItemModel.flags(self, index)
if index.isValid():
return Qt.ItemIsEditable | defaultFlags
else:
return defaultFlags
def proxyColumnToSource(self, proxyColumn):
if proxyColumn == 0:
return NAME
return -1
def sourceColumnToProxy(self, sourceColumn):
if sourceColumn == NAME:
return 0
return -1
# -- For the given source index, this method return the corresponding index in the proxy
def mapFromSource(self, sourceIndex):
"""from a sourceIndex, search the correspondant proxyIndex ; Only map the column NAME"""
if not sourceIndex.isValid():
return QModelIndex()
proxyColumn = self.sourceColumnToProxy( sourceIndex.column() )
if proxyColumn == -1:
return QModelIndex()
model = self.sourceModel()
sixRow = sourceIndex.row()
# -- create another SourceIndex to found the relevant rec.id --
sixId = sourceIndex.sibling(sixRow, 0)
id, fg = sixId.data().toInt()
logging.info("mapFromSource(%d,%d,...) id=%d", sourceIndex.row(), sourceIndex.column(), id)
# -- to calculate the row, use SQL ? --
map = self._get_child_row_(id)
if map is None:
logging.info("mapFromSource(%d,%d,...) deduce None (id=%d)", sourceIndex.row(), sourceIndex.column(), id)
return QModelIndex()
else:
logging.info("mapFromSource(%d,%d,...) deduce (from id=%d) %s", sourceIndex.row(), sourceIndex.column(), repr(map), id)
return self.createIndex(map.childPos, 0, map)
def mapToSource(self, proxyIndex):
if not proxyIndex.isValid():
return QModelIndex()
sourceColumn = self.proxyColumnToSource( proxyIndex.column() )
if sourceColumn == -1:
return QModelIndex()
model = self.sourceModel()
pmap = proxyIndex.internalPointer()
if not pmap.isValid() or pmap.id < 0:
# -- return model.createIndex(-1, -1, None)
logging.info("mapToSource(%s) -> source - index %d, %d", self._repr_index_(proxyIndex), tmap.childPos, sourceColumn)
return QModelIndex()
else:
tmap = self._get_table_row_(pmap.id)
logging.info("mapToSource(%s) -> source - index %d, %d", self._repr_index_(proxyIndex), tmap.childPos, sourceColumn)
return model.createIndex(tmap.childPos, sourceColumn, None)
def index(self, row, column, parent):
if row < 0 or column < 0:
logging.info("index(%d, %d, ...) -> empty index", row, columns)
return QModelIndex()
parentMap = parent.internalPointer()
if parentMap is None:
parentId = 0
else:
parentId = parentMap.id
proxy_map = self._get_child_data_(row, parentId)
logging.info("index(%d, %d, %s) deduce %s", row, column, self._repr_index_(parent), repr(proxy_map))
return self.createIndex(row, column, proxy_map)
def parent(self, index):
if not index.isValid():
return QModelIndex()
currentMap = index.internalPointer()
pid = currentMap.parentId
if pid < 0:
logging.info("parent(%s) -> invalid QModelIndex (because %s)", self._repr_index_(parent), repr(currentMap))
return QModelIndex()
map = self._get_child_row_(pid)
if map is None:
logging.info("parent(%s) deduce empty index", self._repr_index_(index))
return QModelIndex()
else:
logging.info("parent(%s) deduce %s", self._repr_index_(index), repr(map))
return self.createIndex(map.childPos, 0, map)
def hasChildren(self, index):
if not index.isValid():
parentId = 0
else:
parentMap = index.internalPointer()
parentId = parentMap.id
rowCount = self._get_children_count_(parentId)
logging.info("hasChildren(%s) count %s rows", self._repr_index_(index), rowCount)
return rowCount > 0
def rowCount(self, index):
if not index.isValid():
parentId = 0
else:
parentMap = index.internalPointer()
parentId = parentMap.id
rowCount = self._get_children_count_(parentId)
logging.info("rowCount(%s) -> %s", self._repr_index_(index), rowCount)
return rowCount
def columnCount(self, index):
return 1
def data(self, index, role=Qt.EditRole):
if not index.isValid():
return QVariant()
if role == Qt.DecorationRole:
return QVariant()
if role == Qt.TextAlignmentRole:
return QVariant(int(Qt.AlignTop | Qt.AlignLeft))
if role != Qt.DisplayRole and role != Qt.EditRole:
return QVariant()
if index.column() != 0: # -- only column 0 is valid ! --
return QVariant()
# map = index.internalPointer()
# logging.info("data(%s) -> %r" % (self._repr_index_(index), map.name))
# return QVariant(QString(map.name))
# -- Problem: if table updated, map isn't !
# -- Then use the underlying model: --
model = self.sourceModel()
sourceIndex = self.mapToSource( index )
return model.data(sourceIndex)
def _repr_index_(self, index):
m = index.internalPointer()
return "index(%d, %d, %s)" % (index.row(), index.column(), repr(m))
# -- ---------------------------------- --
# -- création de la vue et du conteneur --
# -- ---------------------------------- --
class MyWindow(QWidget):
def __init__(self, *args):
super(MyWindow, self).__init__(*args)
self.setup_model()
self.setup_proxy()
# -- setup layout --
layout = QVBoxLayout(self)
layout.addWidget(self.tableView)
layout.addWidget(self.proxyView)
self.setLayout(layout)
def setup_model(self):
# -- setup the main Table model and View --
# -- def a Sql model:
self.model = QSqlTableModel(self)
self.model.setTable("subjects")
self.model.setEditStrategy(QSqlTableModel.OnManualSubmit)
# --
self.model.setHeaderData(ID, Qt.Horizontal, "Id")
self.model.setHeaderData(ID_PARENT, Qt.Horizontal, "Id Parent")
self.model.setHeaderData(NAME, Qt.Horizontal, "Name")
# --
self.model.setSort(ID, Qt.AscendingOrder) # -- to keep coherence with proxy --
self.model.select()
# --
self.tableView = QTableView(self)
self.tableView.setModel(self.model)
def setup_proxy(self):
# -- def a proxy model: --
m_db = self.model.database()
self.modelTree = CategoryItemModel(m_db, self)
self.modelTree.setSourceModel( self.model )
self.modelTree.select()
# --
self.test_proxy_model()
# --
self.proxyView = QTreeView(self)
self.proxyView.setObjectName("treeView")
# self.proxyView.setRootIsDecorated(False)
self.proxyView.setAlternatingRowColors(True)
self.proxyView.setModel(self.modelTree)
self.proxyView.setSelectionMode(QAbstractItemView.SingleSelection)
# -- test to connect selectionModel: --
# self.selectionModel = self.tableView.selectionModel()
# self.proxyView.setSelectionModel(self.selectionModel)
def test_proxy_model(self):
# -- test mecanism of index / rowCount --
def show_children(index, depth=0):
data = model.data(index)
print "%s %s" % (' '*(2*depth), unicode(data.toString()))
crow = model.rowCount(index)
for xrow in range(crow):
chix = model.index(xrow, 0, index)
show_children(chix, depth+1)
# --
print "Start of test_proxy_model()"
model = self.modelTree
rootix = model.createIndex(-1,-1,None)
show_children(rootix)
print "End of test_proxy_model()"
def createConnection():
db = QSqlDatabase.addDatabase("QSQLITE")
db.setDatabaseName('base.sqlite')
if not db.open():
QtGui.QMessageBox.critical(None, QtGui.qApp.tr("Cannot open database"),
QtGui.qApp.tr("Unable to establish a database connection to SQLite.\n"
"Click Cancel to exit."),
QtGui.QMessageBox.Cancel)
return False
query = QSqlQuery()
fg_tab_ok = True
fg_complete = False
fg_complete_v2 = False
fg_remove = False
try:
vv = query.exec_("select count(*) from subjects")
if vv:
query.next()
if query.isValid():
val, fg_OK = query.value(0).toInt() # -- QVariant --
else:
logging.error("Invalid query or result! ")
val = 0
else:
fg_tab_ok = False
val = 0
if val == 0:
fg_complete = True
if val == 9:
fg_complete_v2 = True
if val == 999:
fg_remove = True
except Exception, iExc:
fg_tab_ok = False
print "raise exception %s: %s" % (iExc.__class__.__name__, str(iExc))
if not fg_tab_ok:
print "Create the table:"
query.exec_("create table subjects(id int primary key, "
"parent_id int, name varchar(40))")
fg_complete = True
if fg_complete:
query.exec_("insert into subjects values(1, 0, 'Categories')")
query.exec_("insert into subjects values(3, 1, 'Webservices')")
query.exec_("insert into subjects values(4, 1, 'Stylesheet')")
query.exec_("insert into subjects values(7, 1, 'Buttons Widgets')")
query.exec_("insert into subjects values(10, 7, 'Test2')")
query.exec_("insert into subjects values(11, 7, 'Test3')")
query.exec_("insert into subjects values(21, 0, 'Variants')")
query.exec_("insert into subjects values(31, 21, 'Layout')")
query.exec_("insert into subjects values(32, 21, 'Shortcut')")
query.exec_("insert into subjects values(33, 31, 'H-Split')")
query.exec_("insert into subjects values(36, 32, 'Copy')")
query.exec_("insert into subjects values(37, 32, 'Paste')")
query.exec_("commit")
if fg_complete_v2:
print "Complete (bis) the table with a root:"
query.exec_("insert into subjects values(34, 31, 'V-Split')")
query.exec_("commit")
if fg_remove:
print "Remove invalid row from table:"
query.exec_("delete from subjects where id = 0")
query.exec_("commit")
return True
#===============================================================================
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
if not createConnection():
sys.exit(1)
window = MyWindow()
window.show()
sys.exit(app.exec_()) |
Problème d'architecture : double vue table/arbre
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