问题描述
QSqlQueryModel 是一个很棒的数据库模型，但它是只读的.所以我重写了它的 setData() 和 flags() 方法.现在，我可以从 QTableView
QSqlQueryModel is a great database model, but it is read only. So I rewrite its setData() and flags() method. Now, I can edit my database table from QTableView
但是当我发出 dataChanged() 时，QTableView 不会自行刷新，当我在 QTableView 中编辑文本框并单击其他地方时，新值写入数据库成功，但文本框的值恢复为旧值.我必须重新选择整个表，性能非常糟糕...
But QTableView won't refresh itself when I emited a dataChanged(), when I edited a textbox in the QTableView and clicked somewhere else, the new value wrote into the database successfully, but the value of the textbox reverted to the old value. I have to re-select the whole table, got really bad performance...
为什么?
class StudentsTableModel(QtSql.QSqlQueryModel):
def __init__(self):
QtSql.QSqlQueryModel.__init__(self)
self.LockedColumns = []
def flags(self, index):
flags = QtSql.QSqlQueryModel.flags(self, index)
if index.column() not in self.LockedColumns:
flags |= QtCore.Qt.ItemIsEditable
return flags
def setData(self, index, value, role):
primary_key_index = self.index(index.row(), 0)
name = self.data(primary_key_index)
field = self.record().fieldName(index.column())
self.update(name, field, value)
self.dataChanged.emit(self.index, self.index)
# Why DataView isn't refresh automatically when
# a dataChanged signal emited? Force re-select...
self.select(self.week)
return True
def update(self, name, field, value):
query = QtSql.QSqlQuery()
sql = ("UPDATE student_info SET '%s' = '%s' WHERE 学生姓名 = '%s'"
% (field, value, name))
query.exec(sql)
def select(self, week):
self.week = week
sql = ("SELECT 学生姓名,第%s周,小组 FROM student_info" % (week))
self.setQuery(sql)
推荐答案
看看这个模型是否适合你:
See how if this model works for you:
class sqlTableModel(QSqlTableModel):
def __init__(self, parent=None):
super(sqlTableModel, self).__init__(parent)
def setData(self, index, value, role=Qt.EditRole):
if role == Qt.EditRole:
value = value.strip() if type(value) == str else value
return super(sqlTableModel, self).setData(index, value, role)
def flags(self, index):
itemFlags = super(sqlTableModel, self).flags(index)
if index.column() != 0:
return itemFlags | Qt.ItemIsEditable
return itemFlags ^ Qt.ItemIsEditable # First column not editable
代替setQuery，我会在主类中设置表格:
Instead of setQuery, to set the table I would have something like this in the main class:
def setDatabase(self, nameDatabase):
self.database = QSqlDatabase.addDatabase("QSQLITE")
self.database.setDatabaseName(nameDatabase)
return self.database.open()
def setTable(self, nameTable):
self.model = sqlTableModel(self)
self.model.setEditStrategy(QSqlTableModel.OnManualSubmit)
self.model.setTable(nameTable)
self.model.select()
self.view.setModel(self.model)
def saveTable(self):
if self.model.submitAll():
return True
self.model.database().rollback()
return False
这篇关于PyQt - QTableView 不响应 dataChanged 信号?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！