我需要对显示在使用QSqlRelationalDelegate的QSqlRelationalTableModel的QTableView中的记录进行排序。我希望对下拉列表和表格视图中的值进行排序。
我做了很多搜索，但是没有找到将QSortFilterProxyModel与QSqlRelationalTableModel和QSqlRelationalDelegate结合使用的示例。我的尝试没有提供排序功能，并且禁用了QSqlRelationalTableModel所需的读写功能，并且还禁用了下拉列表。
表格和下拉列表可以排序吗？
import sys
from PyQt5.QtCore import QSortFilterProxyModel
from PyQt5.QtWidgets import QApplication, QDialog, QTableView, QHBoxLayout
from PyQt5.QtSql import (QSqlDatabase, QSqlTableModel, QSqlRelationalTableModel,
QSqlQuery, QSqlRelation, QSqlRelationalDelegate)
def createDb():
db = QSqlDatabase.addDatabase("QSQLITE")
db.setDatabaseName(":memory:")
if not db.open():
print("Cannot establish a database connection.")
return False
query = QSqlQuery()
query.exec("DROP TABLE IF EXISTS zoos")
query.exec("CREATE TABLE zoos (id INTEGER PRIMARY KEY, zoo_name CHAR)")
query.exec("INSERT INTO zoos (zoo_name) VALUES ('Animal Town')")
query.exec("INSERT INTO zoos (zoo_name) VALUES ('Wild Things')")
query.exec("INSERT INTO zoos (zoo_name) VALUES ('Creatures Everywhere')")
query.exec("DROP TABLE IF EXISTS animals")
query.exec("CREATE TABLE animals (id INTEGER PRIMARY KEY, animal_type CHAR)")
query.exec("INSERT INTO animals(animal_type) VALUES('cougar')")
query.exec("INSERT INTO animals(animal_type) VALUES('cobra')")
query.exec("INSERT INTO animals(animal_type) VALUES('buzzard')")
query.exec("INSERT INTO animals(animal_type) VALUES('anteater')")
query.exec("INSERT INTO animals(animal_type) VALUES('baboon')")
query.exec("INSERT INTO animals(animal_type) VALUES('aardvark')")
query.exec("INSERT INTO animals(animal_type) VALUES('skunk')")
query.exec("INSERT INTO animals(animal_type) VALUES('sheep')")
query.exec("INSERT INTO animals(animal_type) VALUES('skink')")
query.exec("INSERT INTO animals(animal_type) VALUES('ferret')")
query.exec("INSERT INTO animals(animal_type) VALUES('swallow')")
query.exec("INSERT INTO animals(animal_type) VALUES('swan')")
query.exec("INSERT INTO animals(animal_type) VALUES('gecko')")
query.exec("INSERT INTO animals(animal_type) VALUES('gerbil')")
query.exec("DROP TABLE IF EXISTS residences")
query.exec("CREATE TABLE residences (id INTEGER PRIMARY KEY, "
"zoo_id INTEGER, animal_id INTEGER, "
"FOREIGN KEY (zoo_id) REFERENCES zoo(id), "
"FOREIGN KEY (animal_id) REFERENCES animals(id))")
query.exec("INSERT INTO residences(zoo_id, animal_id) VALUES (1,1)")
query.exec("INSERT INTO residences(zoo_id, animal_id) VALUES (1,2)")
query.exec("INSERT INTO residences(zoo_id, animal_id) VALUES (1,3)")
query.exec("INSERT INTO residences(zoo_id, animal_id) VALUES (1,4)")
query.exec("INSERT INTO residences(zoo_id, animal_id) VALUES (2,5)")
query.exec("INSERT INTO residences(zoo_id, animal_id) VALUES (2,6)")
query.exec("INSERT INTO residences(zoo_id, animal_id) VALUES (2,7)")
query.exec("INSERT INTO residences(zoo_id, animal_id) VALUES (2,8)")
query.exec("INSERT INTO residences(zoo_id, animal_id) VALUES (3,9)")
query.exec("INSERT INTO residences(zoo_id, animal_id) VALUES (3,10)")
query.exec("INSERT INTO residences(zoo_id, animal_id) VALUES (3,11)")
query.exec("INSERT INTO residences(zoo_id, animal_id) VALUES (3,12)")
return True
class MainForm(QDialog):
def __init__(self):
super().__init__()
self.zoosModel = QSqlTableModel(self)
self.zoosModel.setTable("zoos")
self.zoosModel.select()
self.zoosView = QTableView()
self.zoosView.setModel(self.zoosModel)
self.zoosView.setColumnHidden(0, True)
self.zoosView.selectionModel().currentRowChanged.connect(self.zoosRowChanged)
self.residencesModel = QSqlRelationalTableModel()
self.residencesModel.setTable("residences")
# self.sort_animals = QSortFilterProxyModel(self)
# self.sort_animals.setSourceModel(self.residencesModel)
# self.sort_animals.sort(1)
self.residencesModel.setRelation(2, QSqlRelation("animals", "id", "animal_type"))
self.residencesModel.select()
self.residencesView = QTableView()
self.residencesView.setModel(self.residencesModel)
# self.residencesView.setModel(self.sort_animals)
self.residencesView.setItemDelegate(QSqlRelationalDelegate(self.residencesView))
self.residencesView.setColumnHidden(0, True)
self.residencesView.setColumnHidden(1, True)
hbox = QHBoxLayout()
hbox.addWidget(self.zoosView)
hbox.addWidget(self.residencesView)
self.setLayout(hbox)
def zoosRowChanged(self, index):
if index.isValid():
record = self.zoosModel.record(index.row())
id = int(record.value("id"))
self.residencesModel.setFilter("zoo_id = {}".format(id))
else:
self.info_detailsModel.setFilter("zoo_id = -1")
if __name__ == "__main__":
app = QApplication(sys.argv)
createDb()
w = MainForm()
w.show()
sys.exit(app.exec_())