python+pyside6+sqlite 数据库测试

QSqlTableModel是可读可写模型，QSqlQueryModel是只读模型，本次使用QSqlTableModel测试

测试代码

import sys
from PySide6.QtWidgets import (QApplication, QMainWindow, QWidget, QVBoxLayout, QPushButton,QTableView,QVBoxLayout)
from PySide6.QtCore import QTimer
from PySide6.QtSql import *
class MyWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("db test")
        self.db_init()
        self.sql_model = QSqlTableModel()
        self.sql_model.setTable("test")
        self.sql_model.setEditStrategy(QSqlTableModel.OnFieldChange)

        self.sql_model.setHeaderData(0,Qt.Horizontal,"id")
        self.sql_model.setHeaderData(1,Qt.Horizontal,"name")
        self.sql_model.setHeaderData(2,Qt.Horizontal,"score")

        self.table_view = QTableView()
        self.table_view.setModel(self.sql_model)

        self.button_select = QPushButton("查询数据")
        self.button_select.clicked.connect(lambda: self.query_sql())

        self.btn_delete = QPushButton("删除数据")
        self.btn_delete.clicked.connect(lambda: self.db_delete())



        self.btn_insert = QPushButton("插入数据")
        self.btn_insert.clicked.connect(lambda: self.db_insert())

        vlayout = QVBoxLayout()
        vlayout.addWidget(self.table_view)
        vlayout.addWidget(self.button_select)
        vlayout.addWidget(self.btn_insert)
        vlayout.addWidget(self.btn_delete)
        self.setLayout(vlayout)
        self.query_sql()
    def db_insert(self):
        print("insert data")
        self.sql_model.insertRow(0)
        id = random.randint(1,99)
        self.sql_model.setData(self.sql_model.index(0,0),id)
        self.sql_model.setData(self.sql_model.index(0,1),"test")
        self.sql_model.setData(self.sql_model.index(0,2),100)
        self.sql_model.submit()



        pass
    def db_delete(self):
        print("delete data")
        self.sql_model.removeRow(0)
        self.sql_model.submit()

    def query_sql(self):
        self.sql_model.setQuery("select * from test")
        self.table_view.setModel(self.sql_model)
        for i in range(self.sql_model.rowCount()):
            id = self.sql_model.data(self.sql_model.index(i,0))
            name = self.sql_model.data(self.sql_model.index(i,1))
            score = self.sql_model.data(self.sql_model.index(i,2))
            print(id,name,score)
        pass


    def db_init(self):
        self.db = QSqlDatabase.addDatabase("QSQLITE")
        self.db.setDatabaseName("test.db")
        if not self.db.open():
            print("db open error")
            error = self.db.lastError()
            print(error.text())
        else:
            print("db open success")
    def closeEvent(self, event):
        try:
            self.db.close()
            event.accept()
        except Exception as e:
            print(e)
if __name__ == "__main__":
    app = QApplication.instance() or QApplication([])
    window = MyWidget()
    window.show()
    app.exec()

问题：出现空行

解决办法1：修改查询函数

def query_sql(self):
        self.sql_model.setTable("test")  # 恢复表模式
        self.sql_model.select()  # 重新查询数据
        self.table_view.setModel(self.sql_model)  # 重新设置模型（可选）
        
        # 打印数据（调试用）
        for i in range(self.sql_model.rowCount()):
            id = self.sql_model.data(self.sql_model.index(i, 0))
            name = self.sql_model.data(self.sql_model.index(i, 1))
            score = self.sql_model.data(self.sql_model.index(i, 2))
            print(id, name, score)

解决办法2：修改后，重新查询，(这要是很大的数据库，会不会很卡）

def db_delete(self):
    print("delete data")
    query = QSqlQuery()
    query.exec("DELETE FROM test WHERE id = (SELECT id FROM test LIMIT 1)")  # 删除第一条
    self.query_sql()  # 刷新模型

def db_insert(self):
    print("insert data")
    query = QSqlQuery()
    id = random.randint(1, 99)
    query.exec(f"INSERT INTO test (id, name, score) VALUES ({id}, 'test', 100)")
    self.query_sql()  # 刷新模型

修改后的代码

import sys
from PySide6.QtWidgets import (QApplication, QMainWindow, QWidget, QVBoxLayout, QPushButton,QTableView,QVBoxLayout)
from PySide6.QtCore import QTimer
from PySide6.QtSql import *
class MyWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("db test")
        self.db_init()
        self.sql_model = QSqlTableModel()
        self.sql_model.setTable("test")
        self.sql_model.setEditStrategy(QSqlTableModel.OnFieldChange)

        self.sql_model.setHeaderData(0,Qt.Horizontal,"id")
        self.sql_model.setHeaderData(1,Qt.Horizontal,"name")
        self.sql_model.setHeaderData(2,Qt.Horizontal,"score")

        self.table_view = QTableView()
        self.table_view.setModel(self.sql_model)

        self.button_select = QPushButton("查询数据")
        self.button_select.clicked.connect(lambda: self.query_sql())

        self.btn_delete = QPushButton("删除数据")
        self.btn_delete.clicked.connect(lambda: self.db_delete())



        self.btn_insert = QPushButton("插入数据")
        self.btn_insert.clicked.connect(lambda: self.db_insert())

        vlayout = QVBoxLayout()
        vlayout.addWidget(self.table_view)
        vlayout.addWidget(self.button_select)
        vlayout.addWidget(self.btn_insert)
        vlayout.addWidget(self.btn_delete)
        self.setLayout(vlayout)
        self.query_sql()
    def db_insert(self):
        print("insert data")
        self.sql_model.insertRow(0)
        id = random.randint(1,99)
        score = random.randint(1,100)
        self.sql_model.setData(self.sql_model.index(0,0),id)
        self.sql_model.setData(self.sql_model.index(0,1),"test")
        self.sql_model.setData(self.sql_model.index(0,2),score)
        self.sql_model.submit()

        pass
    def db_delete(self):
        print("delete data")
        query = QSqlQuery()
        query.exec("DELETE FROM test WHERE id = (SELECT id FROM test LIMIT 1)")  # 删除第一条
        self.query_sql()  # 刷新模型

    def query_sql(self):
        self.sql_model.setTable("test")  # 恢复表模式
        self.sql_model.select()  # 重新查询数据
        self.table_view.setModel(self.sql_model)  # 重新设置模型（可选）
        
        # 打印数据（调试用）
        for i in range(self.sql_model.rowCount()):
            id = self.sql_model.data(self.sql_model.index(i, 0))
            name = self.sql_model.data(self.sql_model.index(i, 1))
            score = self.sql_model.data(self.sql_model.index(i, 2))
            print(id, name, score)


    def db_init(self):
        self.db = QSqlDatabase.addDatabase("QSQLITE")
        self.db.setDatabaseName("test.db")
        if not self.db.open():
            print("db open error")
            error = self.db.lastError()
            print(error.text())
        else:
            print("db open success")
    def closeEvent(self, event):
        try:
            self.db.close()
            event.accept()
        except Exception as e:
            print(e)
if __name__ == "__main__":
    app = QApplication.instance() or QApplication([])
    window = MyWidget()
    window.show()
    app.exec()

小结