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python中怎么利用mysqldb类库操作数据库

这期内容当中小编将会给大家带来有关python中怎么利用 MySQLdb类库操作数据库，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。

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1.安装MySQLdb
pip install MySQLdb

2.代码

  1. import MySQLdb

  3. class MysqlSearch(object):

  5.     def __init__(self):

  6.         self.get_conn()

  8.     def get_conn(self):

  9.         try:

  10.             self.conn = MySQLdb.connect(

  11.                 host='127.0.0.1',

  12.                 user='root',

  13.                 passwd='root',

  14.                 db='test',

  15.                 port=3308,

  16.                 charset='utf8'

  17.             )

  18.         except MySQLdb.Error as e:

  19.             print('Error: %s' % e)

  21.     def close_conn(self):

  22.         try:

  23.             if self.conn:

  24.                 # 关闭链接

  25.                 self.conn.close()

  26.         except MySQLdb.Error as e:

  27.             print('Error: %s' % e)

  29.     def get_one(self):

  30.         # 准备SQL

  31.         sql = 'SELECT * FROM `news` WHERE `types` = %s ORDER BY `created_at` DESC;'

  32.         # 找到cursor

  33.         cursor = self.conn.cursor()

  34.         # 执行SQL

  35.         cursor.execute(sql, ('百家', ))

  36.         # print(dir(cursor))

  37.         # 拿到结果

  38.         rest = dict(zip([k[0] for k in cursor.description], cursor.fetchone()))

  39.         # 处理数据

  40.         # 关闭cursor/链接

  41.         cursor.close()

  42.         self.close_conn()

  43.         return rest

  45.     def get_more(self):

  46.         # 准备SQL

  47.         sql = 'SELECT * FROM `news` WHERE `types` = %s ORDER BY `created_at` DESC;'

  48.         # 找到cursor

  49.         cursor = self.conn.cursor()

  50.         # 执行SQL

  51.         cursor.execute(sql, ('百家', ))

  52.         # print(dir(cursor))

  53.         # 拿到结果

  54.         rest = [dict(zip([k[0] for k in cursor.description], row))

  55.             for row in cursor.fetchall()]

  56.         # 处理数据

  57.         # 关闭cursor/链接

  58.         cursor.close()

  59.         self.close_conn()

  60.         return rest

  62.     def get_more_by_page(self, page, page_size):

  63.         ''' 分页查询数据 '''

  64.         offset = (page - 1) * page_size

  65.         # 准备SQL

  66.         sql = 'SELECT * FROM `news` WHERE `types` = %s ORDER BY `created_at` DESC LIMIT %s, %s;'

  67.         # 找到cursor

  68.         cursor = self.conn.cursor()

  69.         # 执行SQL

  70.         cursor.execute(sql, ('百家', offset, page_size))

  71.         # print(dir(cursor))

  72.         # 拿到结果

  73.         rest = [dict(zip([k[0] for k in cursor.description], row))

  74.             for row in cursor.fetchall()]

  75.         # 处理数据

  76.         # 关闭cursor/链接

  77.         cursor.close()

  78.         self.close_conn()

  79.         return rest

  81.     def add_one(self):

  82.         ''' 插入数据 '''

  83.         # 受影响的行数

  84.         row_count = 0

  85.         try:

  86.             # 准备SQL

  87.             sql = (

  88.                 "INSERT INTO `news`(`title`,`image`, `content`, `types`, `is_valid`) VALUE"

  89.                 "(%s, %s, %s, %s, %s);"

  90.             )

  91.             # 获取链接和cursor

  92.             cursor = self.conn.cursor()

  93.             # 执行sql

  94.             # 提交数据到数据库

  95.             cursor.execute(sql, ('标题11', '/static/img/news/01.png', '新闻内容5', '推荐', 1))

  96.             # cursor.execute(sql, ('标题12', '/static/img/news/01.png', '新闻内容6', '推荐', 1))

  97.             # 提交事务

  98.             self.conn.commit()

  99.         except :

  100.             print('error')

  101.             # 回滚事务

  102.             self.conn.rollback()

  103.         # 执行最后一条SQL影响的行数

  104.         row_count = cursor.rowcount

  105.         # 关闭cursor和链接

  106.         cursor.close()

  107.         self.close_conn()

  108.         # row_count > 0 表示成功

  109.         return row_count > 0

  113. def main():

  114.     obj = MysqlSearch()

  115.     # rest = obj.get_one()

  116.     # print(rest['title'])

  118.     # rest = obj.get_more()

  119.     # for item in rest:

  120.     # print(item)

  121.     # print('------')

  123.     # rest = obj.get_more_by_page(2, 3)

  124.     # for item in rest:

  125.     # print(item)

  126.     # print('------')

  128.     rest = obj.add_one()

  129.     print(rest)

  132. if __name__ == '__main__':

  133.     main()

上述就是小编为大家分享的python中怎么利用 mysqldb类库操作数据库了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注创新互联行业资讯频道。


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