Python操作MySql类封装

       最近用到Python操作数据库，除了SQLSERVER操作封装类https://blog.csdn.net/sinat_28984567/article/details/105342874，还有MySql的操作需求，简单写了一个Mysql封装操作类，分享一下，需要安装pymsql，安装方法：https://blog.csdn.net/sinat_28984567/article/details/105316092，下边是操作类：
 

# python mysql 操作类

import pymysql


class DBHelper:

    def __init__(self, host="127.0.0.1", port=3306, user="root", password="123456",
                 database="test"):  # 构造函数
        try:
            self.conn = pymysql.connect(host=host, port=port, user=user, password=password, database=database,
                                        charset='utf8')
            self.cursor = self.conn.cursor()
        except Exception as e:
            print(e)

    # 返回执行execute()方法后影响的行数 

    def execute(self, sql):
        self.cursor.execute(sql)
        rowcount = self.cursor.rowcount
        return rowcount

    # 删除并返回影响行数
    def delete(self, **kwargs):
        table = kwargs['table']

        where = kwargs['where']
        sql = 'DELETE FROM %s where %s' % (table, where)
        print(sql)
        try:
            # 执行SQL语句
            self.cursor.execute(sql)
            # 提交到数据库执行
            self.conn.commit()
            # 影响的行数
            rowcount = self.cursor.rowcount
        except:
            # 发生错误时回滚
            self.conn.rollback()
        return rowcount

    # 新增并返回新增ID
    def insert(self, **kwargs):
        table = kwargs['table']
        del kwargs['table']
        sql = 'insert into %s(' % table
        fields = ""
        values = ""
        for k, v in kwargs.items():
            fields += "%s," % k
            values += "'%s'," % v
        fields = fields.rstrip(',')
        values = values.rstrip(',')
        sql = sql + fields + ")values(" + values + ")"
        print(sql)
        try:
            # 执行SQL语句
            self.cursor.execute(sql)
            # 提交到数据库执行
            self.conn.commit()
            # 获取自增id
            res = self.cursor.lastrowid
        except:
            # 发生错误时回滚
            self.conn.rollback()
        return res

    # 修改数据并返回影响的行数

    def update(self, **kwargs):
        table = kwargs['table']
        # del kwargs['table']
        kwargs.pop('table')
        where = kwargs['where']
        kwargs.pop('where')
        sql = 'update %s set ' % table
        for k, v in kwargs.items():
            sql += "%s='%s'," % (k, v)
        sql = sql.rstrip(',')
        sql += ' where %s' % where
        print(sql)
        try:
            # 执行SQL语句
            self.cursor.execute(sql)
            # 提交到数据库执行
            self.conn.commit()
            # 影响的行数
            rowcount = self.cursor.rowcount
        except:
            # 发生错误时回滚
            self.conn.rollback()
        return rowcount

    # 查-一条条数据
    def selectTopone(self, **kwargs):
        table = kwargs['table']
        field = 'field' in kwargs and kwargs['field'] or '*'
        where = 'where' in kwargs and 'where ' + kwargs['where'] or ''
        order = 'order' in kwargs and 'order by ' + kwargs['order'] or ''
        sql = 'select %s from %s %s %s limit 1' % (field, table, where, order)
        print(sql)
        try:
            # 执行SQL语句
            self.cursor.execute(sql)
            # 使用 fetchone() 方法获取单条数据.
            data = self.cursor.fetchone()
        except:
            # 发生错误时回滚
            self.conn.rollback()
        return data

    # 查所有数据
    def selectAll(self, **kwargs):
        table = kwargs['table']
        field = 'field' in kwargs and kwargs['field'] or '*'
        where = 'where' in kwargs and 'where ' + kwargs['where'] or ''
        order = 'order' in kwargs and 'order by ' + kwargs['order'] or ''
        sql = 'select %s from %s %s %s ' % (field, table, where, order)
        print(sql)
        try:
            # 执行SQL语句
            self.cursor.execute(sql)
            # 使用 fetchone() 方法获取单条数据.
            data = self.cursor.fetchall()
        except:
            # 发生错误时回滚
            self.conn.rollback()
        return data

        测试：

import MySQL

conn = MySQL.DBHelper('127.0.0.1', 3306, 'root', '123456', 'test')

# insert测试
# cs = conn.insert(table="T1", Name="Python测试2", Sex="男")
# print(cs)

# delete 测试
# cs = conn.delete(table="T1", where="Id = 2")
# print(cs)

# update 测试
# cs = conn.update(table="T1", Name="Python测试3", Sex="man", where="Id in(1,2)")
# print(cs)

# select 测试
cs = conn.selectAll(table="T1", where="Name = 'Python测试3'")
print(cs)

       结果：

       刚刚接触Python，欢迎指正。