python实现数据库跨服务器迁移
基于Python2.7的版本环境，Python实现的数据库跨服务器(跨库)迁移, 每以5000条一查询一提交，代码中可以自行更改每次查询提交数目.
# -*- coding: utf-8 -*-
import MySQLdb
import time
import warnings
warnings.filterwarnings("ignore")
class ConnectMysql(object):
def __init__(self):
# 这里设置分页查询, 每页查询多少数据
self.page_size = 5000
def getTable(self):
conn = MySQLdb.connect(
host="***.***.**.**",
user="****",
passwd="*************",
db='****',
charset='utf8'
)
conn_local = MySQLdb.connect(
host="********************************",
user="**********",
passwd="********",
db='*******',
charset='utf8'
)
cur = conn.cursor()
cur_local = conn_local.cursor()
cur.execute('show tables')
tables = cur.fetchall()
for table in tables:
print str(table[0]).lower()
# 需要迁移的数据库查询表的列数
cur.execute("SELECT COUNT(*) FROM information_schema.COLUMNS WHERE table_schema='china' AND table_name='" + table[0] + "'")
table_col_count = cur.fetchone()
# print table_col_count[0]
# 需要迁移的数据库查询表的结构
cur.execute('show create table ' + table[0])
result = cur.fetchall()
create_sql = result[0][1]
# 查询需要迁移的数据库表的数据条数
cur.execute('select count(*) from ' + table[0])
total = cur.fetchone()
page = total[0] / self.page_size
page1 = total[0] % self.page_size
if page1 != 0:
page = page + 1
# 阿里云数据库创建表
cur_local.execute("SELECT table_name FROM information_schema.`TABLES` WHERE table_schema='user' AND table_name='" + str(table[0]).lower() + "'")
table_name = cur_local.fetchone()
if table_name is None:
cur_local.execute(create_sql)
for p in range(0, page):
while True:
try:
print '开始', table[0], '的第', p + 1, '页查询'
if p == 0:
limit_param = ' limit ' + str(p * self.page_size) + ',' + str(self.page_size)
else:
limit_param = ' limit ' + str(p * self.page_size + 1) + ',' + str(self.page_size)
cur.execute('select * from ' + table[0] + limit_param)
inserts = cur.fetchall()
print '查询成功'
param = ''
for i in range(0, table_col_count[0]):
param = param + '%s,'
print '开始插入'
cur_local.executemany('replace into ' + table[0] + ' values (' + param[0:-1] + ')', inserts)
print table[0], '的第', p + 1, '页, 插入完成, 还有', page - p - 1, '页, 任重而道远'
conn_local.commit()
break
except Exception as e:
print e
time.sleep(60)
cur = conn.cursor()
cur_local = conn_local.cursor()
print table[0], ' 插入完成'
print '\n \n ======================================================================== \n\n'
cur_local.close()
conn_local.close()
cur.close()
conn.close()
if __name__ == '__main__':
conn_mysql = ConnectMysql()
conn_mysql.getTable()
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持【听图阁-专注于Python设计】。