用python连接mysql数据库进行常用操作，将常用操作封装成了一个类方便调用
"""
连接数据库，查询、增加、删除数据
"""
import MySQLdb
class MysqlSearch(object):
"""docstring for ClassName"""
def __init__(self):
# super(ClassName, self).__init__()
# self.arg = arg
self.get_conn()
def get_conn(self):
# 获取连接
try:
self.conn = MySQLdb.connect(
host = 'localhost',
user = 'root',
passwd = 'root',
db = 'data',
port = 3306,
charset = 'utf8'
)
except MySQLdb.Error as e:
print('Error is: %s' % e)
def close_conn(self):
try:
if self.conn:
# 关闭连接
self.conn.close()
except MySQLdb.Error as e:
print('Error is: %s' % e)
def get_one(self):
# 准备SQL
sql = 'SELECT * FROM `news` WHERE `types` = %s ORDER BY `created_at` DESC;'
# 找到cursor
cursor = self.conn.cursor()
# 执行SQL
cursor.execute(sql,('百家',)) # 参数为元组，当只有一个元素时后面要加，
# print(cursor.rowcount) # 打印行数
# print(dir(cursor)) # 查看cursor属性
# print(cursor.description)
# 拿到结果
rest = cursor.fetchone()
rest = dict(zip([k[0] for k in cursor.description],rest))
# print(rest)
# print(rest['title'])
# 处理数据
# 关闭cursor、连接
cursor.close()
self.close_conn()
return rest
def get_more(self):
# 准备SQL
sql = 'SELECT * FROM `news` WHERE `types` = %s ORDER BY `created_at` DESC;'
# 找到cursor
cursor = self.conn.cursor()
# 执行SQL
cursor.execute(sql,('百家',))
# print(cursor.rowcount) # 打印行数
# print(dir(cursor)) # 查看cursor属性
# print(cursor.description)
# 拿到结果
rest = cursor.fetchall()
rest = [dict(zip([k[0] for k in cursor.description],row))
for row in rest]
# print(rest)
# print(rest['title'])
# 处理数据
# 关闭cursor、连接
cursor.close()
self.close_conn()
return rest
def get_more2(self,page,page_size):
offset = (page - 1) * page_size
# 准备SQL
sql = "SELECT * FROM `news` WHERE `types` = %s ORDER BY `created_at` DESC LIMIT %s %s;"
# 找到cursor
cursor = self.conn.cursor()
# 执行SQL
cursor.execute(sql,('百家',))
# print(cursor.rowcount) # 打印行数
# print(dir(cursor)) # 查看cursor属性
# print(cursor.description)
# 拿到结果
rest = cursor.fetchall()
rest = [dict(zip([k[0] for k in cursor.description],row))
for row in rest]
# print(rest)
# print(rest['title'])
# 处理数据
# 关闭cursor、连接
cursor.close()
self.close_conn()
return rest
def add_one(self):
try:
# 准备SQL
sql = (
"INSERT INTO `news` (`title`,`content`,`types`) VALUE"
"(%s,%s,%s);"
) # 内容加单引号"
# 找到cursor
cursor = self.conn.cursor()
# 执行SQL
cursor.execute(sql,('标题15','陈军的测试10','最新',))
cursor.execute(sql,('标题16','陈军的测试11','头条',))
# 提交事务
self.conn.commit()
# 关闭cursor、连接
cursor.close()
except MySQLdb.Error as e:
print("error is %s"%e)
# self.conn.commit() # 提交多条数据，如果想让正常的存入，则再次提交即可
self.conn.rollback() # 如果一条错误，本次提交全部失效
self.close_conn()
def delete_one(self):
try:
# 准备SQL
# sql = (
# "INSERT INTO `news` (`title`,`content`,`types`) VALUE"
# "(%s,%s,%s);"
# ) # 内容加单引号"
sql2 = ("DELETE FROM `table` WHERE id = 3")
# 找到cursor
cursor = self.conn.cursor()
# 执行SQL
# cursor.execute(sql,('标题15','陈军的测试10','最新',))
# cursor.execute(sql,('标题16','陈军的测试11','头条',))
cursor.execute(sql2)
# 提交事务
self.conn.commit()
# 关闭cursor、连接
cursor.close()
except MySQLdb.Error as e:
print("error is %s"%e)
# self.conn.commit() # 提交多条数据，如果想让正常的存入，则再次提交即可
self.conn.rollback() # 如果一条错误，本次提交全部失效
self.close_conn()
def test(self):
try:
# 准备SQL
sql = (
"INSERT INTO `news` (`title`,`content`,`types`) VALUE"
"(%s,%s,%s);"
) # 内容加单引号"
# 找到cursor
cursor = self.conn.cursor()
# 执行SQL
# cursor.execute(sql,('标题15','陈军的测试10','最新',))
# cursor.execute(sql,('标题16','陈军的测试11','头条',))
cursor.execute(sql)
# 提交事务
self.conn.commit()
# 关闭cursor、连接
cursor.close()
except MySQLdb.Error as e:
print("error is %s"%e)
# self.conn.commit() # 提交多条数据，如果想让正常的存入，则再次提交即可
self.conn.rollback() # 如果一条错误，本次提交全部失效
self.close_conn()
def main():
obj = MysqlSearch()
# rest = obj.get_one()
# print(rest["title"])
# rest = obj.get_more()
# for item in rest:
# print(item["title"])
# print("---"*10)
obj.test()
if __name__ == '__main__':
main()