Python数据库封装实现代码示例解析

import pymysql

# 查  所数据
def get_all(sql):
  conn = pymysql.connect(host="localhost", user="root", password="root", database="db6")
  cur = conn.cursor(cursor=pymysql.cursors.DictCursor)
  cur.execute(sql)
  res = cur.fetchall()
  cur.close()
  conn.close()
  return res


# 查 一行数据
def get_one(sql,args):
  conn = pymysql.connect(host="localhost", user="root", password="root", database="db6")
  cur = conn.cursor(cursor=pymysql.cursors.DictCursor)
  cur.execute(sql,args)
  res = cur.fetchone()
  cur.close()
  conn.close()
  return res



# 增 删 改 都要提交 commit
def get_mif(sql,args):
  conn = pymysql.connect(host="localhost", user="root", password="root", database="db6")
  cur = conn.cursor(cursor=pymysql.cursors.DictCursor)
  cur.execute(sql,args)
  conn.commit()
  cur.close()
  conn.close()


# 增 删 改 都要提交 commit
# 添加并且带返回值
def get_create(sql,args):
    conn = pymysql.connect(host="localhost", user="root", password="root", database="db6")
    cur = conn.cursor(cursor=pymysql.cursors.DictCursor)
    cur.execute(sql,args)
    conn.commit()
    cur.close()
    conn.close()
    return cur.lastrowid
    # python插入记录后取得主键id的方法(cursor.lastrowid和conn.insert_id())



# 增 删 改 都要提交 commit
# 批量加入 以元祖的形式传参数  就是添加几次次提交一次
def mul_mode(sql, args):
    conn = pymysql.connect(host="localhost", user="root", password="root", database="db6")
    cur = conn.cursor(cursor=pymysql.cursors.DictCursor)
    # self.cursor.executemany("insert into user (id,name) values (%s,%s)",[(1,"aaa"),(2,"bbb"),(3,"ccc")]) 传参方式
    cur.executemany(sql, args)
    conn.commit()
    cur.close()
    conn.close()

import pymysql
# 注意 args 参数可以传空值[]
class Mysqls(object):
  def __init__(self):
     # 读取配置文件
    self.connect()

  def connect(self):
    self.conn = pymysql.connect(host="localhost", user="root", password="root", database="db6")  # 可以把主机连接等写入配置文件 等
    self.cursor=self.conn.cursor(cursor=pymysql.cursors.DictCursor)

  # 获取所以数据
  def get_all(self,sql,args):
     self.cursor.execute(sql,args)
     res = self.cursor.fetchall()
     return res

  # 获取一行数据
  def get_one(self,sql,args):
    self.cursor.execute(sql, args)
    res = self.cursor.fetchone()
    return res

  # 添加 就是添加一次提交多次
  def get_mode (self,sql,args):
    self.cursor.execute(sql, args)
    self.conn.commit()

  # 添加并且带返回值
  def get_create(self,sql,args):
    self.cursor.execute(sql,args)
    self.conn.commit()
    return self.cursor.lastrowid
    # python插入记录后取得主键id的方法(cursor.lastrowid和conn.insert_id())

   # 批量加入 以元祖的形式传参数  就是添加一次提交一次
  def mul_mode(self, sql, args):
    # self.cursor.executemany("insert into user (id,name) values (%s,%s)",[(1,"aaa"),(2,"bbb"),(3,"ccc")]) 传参方式
    self.cursor.executemany(sql, args)
    self.conn.commit()

  def get_close(self):
      self.cursor.close()
      self.conn.close()