说明：代码是从项目源代码中抽取，需要进行适应性修改，不保证可运行。

1 读取MySQL数据库

需要提前安装 pymysql 库。

简单版本：

# 需安装 pymysql 库
import pymysql
import systry:con = pymysql.connect(host='localhost', port='3306',user='kitty', password='123456',database='user_db')
except Exception:pass# QMessageBox.information(None, '错误', 'MySQL数据库连接错误')# con 就代表数据库的链接
cur = con.cursor()
sql = "select * from t_user where userid = %s and userpwd = %s"
data = ("Kitty","123")
cur.execute(sql, data)
result = cur.fetchall()
cur.close()  # 关闭游标
con.close()  # 关闭数据库链接
print(result)

包装成类：

import pymysqlclass MyDB:""" 简单包装 """def __init__(self):self.con = Noneself.initCon()def initCon(self):try:con = pymysql.connect(host='localhost', port='3306',user='kitty', password='123456',database='user_db')self.con = conexcept Exception:pass# QMessageBox.information(None, '错误', 'MySQL数据库连接错误')def query(self, sql, data=None):"""查询数据，data只能是单个元组，不能是元组的列表使用 %s 占位符，防止SQL注入:param sql: 带有%s占位符的SQL语句 "SELECT * FROM user WHERE uid=%s and name=%s and pwd=%s ":param data: (uid,name,pwd...):return:"""if not self.con:self.initCon()con = self.concur = con.cursor()cur.execute(sql, data)l = cur.fetchall()cur.close()return ldef execute(self, sql, data):"""新增/删除/更新数据，注意：data必须是list！里面可包裹1到多个元组此函数不返回数据。支持insert,delete,updateinsert: insert into user(name,pwd) values(%s,%s)delete: update user set delflag=1 where id=%supdate: update user set name=%s and pwd=%s where id = %s:param sql: 带有%s占位符的SQL语句:param data: [('tom','123456'),('jerry','123456')]:return:"""if not self.con:self.initCon()con = self.contry:cur = con.cursor()cur.executemany(sql, data)con.commit()# return cur.lastrowidexcept Exception:pass# con.rollback()# QMessageBox.information(None, '错误', '操作出现错误')# traceback.print_exc()  # 可打印错误行号，异常的详细内容finally:cur.close()def insertSglRtnId(self, sql, data):"""插入单条数据，并返回新插入记录id:param sql: 带有%s占位符的SQL语句:param data: 数据元组:return: lastrowid"""if not self.con:self.initCon()con = self.contry:cur = con.cursor()cur.execute(sql, data)con.commit()return cur.lastrowidexcept Exception:pass# traceback.print_exc()  # 可打印错误行号，异常的详细内容finally:cur.close()def cleartbl(self, tablename):"""清空表内容:return:"""if not self.con:self.initCon()con = self.concur = con.cursor()cur.execute("delete from " + tablename + " where 1=1 ")con.commit()cur.close()def close(self):"""关闭数据库链接，必须要调用:return:"""if self.con:self.con.close()if __name__ == "__main__":pass

使用方法：

sql = "select * from t_user where username = %s usersex = %s"
data = ('Kitty', 'male')
db = MyDB()
if not db:records = db.query(sql, data)
db.close()
print(records)

2 填充到Qt的表格控件中

def fillTbl(self):# ...省略读取数据库代码# records 是从数据库中获取的数据list# 填充表格控件header = ['ID', '姓名', '密码', '性别', '年龄', '排序号']  # 设置表头cols = len(header)  # 列数rows = len(records)  # 行数table = self.tbl  # 表格控件table.setColumnCount(cols)table.setRowCount(rows)table.horizontalHeader().setDefaultAlignment(Qt.AlignLeft | Qt.AlignVCenter)  # 左右居左 上下居中table.setHorizontalHeaderLabels(header)# 遍历records 逐项填充每个单元格for i in range(0, rows):for j in range(0, cols):if not records[i][j]:item = QTableWidgetItem(str(""))else:item = QTableWidgetItem(str(records[i][j]))item.setToolTip(str(records[i][j]))  # 鼠标悬停提示气泡，方便显示过长内容table.setItem(i, j, item)  # 设置i行j列的内容