python从一个数据库导数据到另一个数据库中（mysql）

语句

	import pymysql
	
	
	#查询的数据表
	db2=pymysql.connect('172.16.33.100','root',':****@','tz_after_loan')
	cursor2=db2.cursor() //其实就是用来获得python执行Mysql命令的方法,也就是操作游标
	len2=cursor2.execute('select * from address ' )
	
	
	#插入的数据表
	db1=pymysql.connect('localhost','root','123456','cgo')
	cursor1=db1.cursor()
	sql="insert into address_test() value(%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)"
	
	num=11
	
	for i in range(int(len2/num)):
	    print(i)
		    #获取num条记录
	    data1=cursor2.fetchmany(num)
	    #executemany能同时执行多条语句，第一个参数为sql模板字符串，第二个为sql的参数，是一个列表
	    cursor1.executemany(sql,data1)
	
	#这样可以一次性全部导入
	data2=cursor2.fetchall()　//返回查询到的所有记录
	cursor1.executemany(sql,data2)
	
	
	db1.commit()
	db1.close()
	db2.close()	

参考链接

records库操作SQL查询MySQL数据库

records库可以快速的查询数据库，比操作游标cursor对象要好使，还支持导出为具体格式
支持：RedShift, Postgres, MySQL, SQLite, Oracle, and MS-SQL

import records

db = records.Database('mysql://root:123456@localhost/demo?charset=utf8')

rows = db.query("select * from names")

for row in rows:
   print(row.id, row.name, row.age)

"""
2 大红 24
3 大壮 24
4 秀英 24
6 小明 23
7 大名 23
10 壮壮 25
"""

"""
mysql> select * from names;

+----+--------+------+
| id | name   | age  |
+----+--------+------+
|  2 | 大红   |   24 |
|  3 | 大壮   |   24 |
|  4 | 秀英   |   24 |
|  6 | 小明   |   23 |
|  7 | 大名   |   23 |
| 10 | 壮壮   |   25 |
+----+--------+------+
"""

# 转为json
print(rows.as_dict())

# 导出为具体格式，支持： csv、yaml、json、xls、df（DataFrame）
print(rows.export("json"))

# 转为表格形式
print(rows.dataset)

采用records将两个库中的数据导入一个库

import records
import pymysql

companyMap = {}  # 字典类似hashmap，取值用 companyMap[“sex”]
addressMap = {}


def connectDB():
    global approvalDB
    global appDB
    global ourDB
    appDB = records.Database('mysql+pymysql://root:****@172.16.33.100/tz_app_prod?charset=utf8')
    ourDB = records.Database('mysql+pymysql://root::****@@localhost/books?charset=utf8mb4')
    approvalDB = records.Database('mysql+pymysql://root::****@@172.16.33.100/tz_approval_prod?charset=utf8')
    print("init DB connection finish")


def scanCompanyInfo():
    workRows = appDB.query("select * from job_infos")
    for workRow in workRows:
        insertCompany(workRow)
    print("scan company finish")


def scanCompanyClassInfo():
    workClassRows = approvalDB.query("select * from approval_infos")
    for workClassRow in workClassRows:
        updataCompany(workClassRow)
    print("scan company class finish")


def updataCompany(workClassInfo):
    if workClassInfo.company_industry_category == '':
        k = 0
    else:
        k = int(workClassInfo.company_industry_category)
    ourDB.query("update company set class ='%d'  where company_name='%s'" % (k, workClassInfo.company_name))


def insertCompany(companyInfo):
    if companyInfo.workplace in companyMap:
        return
    ourDB.query('INSERT INTO company (company_name, address_id, phone_num) VALUES(:name, :aID, :phone)',
                name=companyInfo.workplace, aID=1, phone=companyInfo.workplace_phone)


if __name__ == "__main__":
    connectDB()
    scanCompanyInfo()
    scanCompanyClassInfo()