Python calls mysql method to update data
This time I will bring you how to use Python to call mysql to update data. What are the precautions for calling mysql to update data in Python? The following is a practical case, let's take a look.
The example in this article describes how Python implements the function of updating data by calling mysqlstored procedure. Share it with everyone for your reference, the details are as follows:
1. Demand analysis
Due to the management rate configuration error, the repayment of the generated order There are errors in the calculation of various amounts and management fees in the interest payment table and order table, and data correction is required. For this reason, in order to build a wheel, it will save a lot of effort in the future, and all modifications will be done with programs, without any manual input.2. Create mysql stored procedure with parameters
1. Update order interest payment table (t_order_rapay)
drop procedure if exists update_t_order_rapay; delimiter $$ create procedure update_t_order_rapay(IN orderNo varchar(64)) begin declare t_order_no varchar(64); set t_order_no=orderNo; UPDATE t_order_repay SET total_amount=principal+interest+round(manage_amount*0.0808/0.052,3)+breach_amount, left_amount=principal+interest+round(manage_amount*0.0808/0.052,3)+breach_amount, left_repay_manager=round(manage_amount*0.0808/0.052,3), manage_amount=round(manage_amount*0.0808/0.052,3) WHERE order_no=t_order_no; end $$ delimiter;
2. Update the order table (t_order_info)
drop procedure if exists update_t_order_info; delimiter $$ create procedure update_t_order_info(IN orderNo varchar(64)) begin declare t_order_no varchar(64); set t_order_no=orderNo; SELECT left_amount into @m1 from t_order_repay WHERE order_no=t_order_no ORDER BY plan_time LIMIT 1; UPDATE t_order_info set manage_cost_rate=0.0808, manage_cost=round(manage_cost*0.0808/0.052,3), left_amount=borrow_amount+interest_amount+manage_cost, next_amount_need=@m1 WHERE order_no=t_order_no; end $$ delimiter;
3. Python calls the stored procedure in mysql
# encoding: utf-8 import time import sys reload(sys) sys.setdefaultencoding('utf-8') time1 = time.time() import pandas as pd import pymysql ############################################从数据库读数据########################################### ###########线上###################### # 加上字符集参数,防止中文乱码 # conn=pymysql.connect( # host="##########", # database="######", # user="####", # password="##########", # port=#######, # charset='utf8' # ) # #############测试库###################### # ## 加上字符集参数,防止中文乱码 # conn=pymysql.connect( # host="172.16.34.32", # database="#########", # user="admin", # password="##############", # port=#########, # charset='utf8' # ) #sql语句(安徽) # sqlcmd=""" # SELECT order_no from t_order_info WHERE offline_org_no in( # 0032,0035,0036 # # # ) and substr(create_time,1,10)>="2017-10-31" # # and `status` in(105,106,107,108) # # and manage_cost_rate=0.052 # # # """ #################sql语句(江苏) # sqlcmd2=""" # SELECT order_no from t_order_info WHERE offline_org_no in( # 0002,0005,0006,0007,0008,0009,0010,0011,0012,0013,0014,0017,0018,0019,0025,0026,0027,0028,0030,0031,0033,0034 # ) and substr(create_time,1,10)>="2017-10-31" # and `status` in(105,106,107,108) # and manage_cost_rate=0.052 # # """ #利用pandas 模块导入mysql数据 # data=pd.read_sql(sqlcmd2,conn) # print data # # # ###################更新order_rapay表 # for each in data["order_no"]: # print each # # 创建游标 # cursor = conn.cursor(cursor=pymysql.cursors.DictCursor) # #有参数存储过程 # cursor.execute('call update_t_order_rapay(%s)',(each)) # conn.commit() # # print "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%" # #####################更新order_info表################### # for each in data["order_no"]: # print each # # # 创建游标 # cursor = conn.cursor(cursor=pymysql.cursors.DictCursor) # #有参数存储过程 # cursor.execute('call update_t_order_info(%s)', (each)) # conn.commit() # # # cursor.close() # print '调用存储过程完毕................' # conn.close() # time2=time.time() # print u'总共耗时:' + str(time2 - time1) + 's'
The object of diff is the virtual dom
Event emitter’s listening event
The above is the detailed content of Python calls mysql method to update data. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











MySQL and phpMyAdmin are powerful database management tools. 1) MySQL is used to create databases and tables, and to execute DML and SQL queries. 2) phpMyAdmin provides an intuitive interface for database management, table structure management, data operations and user permission management.

In MySQL, the function of foreign keys is to establish the relationship between tables and ensure the consistency and integrity of the data. Foreign keys maintain the effectiveness of data through reference integrity checks and cascading operations. Pay attention to performance optimization and avoid common errors when using them.

Discussion on Hierarchical Structure in Python Projects In the process of learning Python, many beginners will come into contact with some open source projects, especially projects using the Django framework...

Both Python and JavaScript's choices in development environments are important. 1) Python's development environment includes PyCharm, JupyterNotebook and Anaconda, which are suitable for data science and rapid prototyping. 2) The development environment of JavaScript includes Node.js, VSCode and Webpack, which are suitable for front-end and back-end development. Choosing the right tools according to project needs can improve development efficiency and project success rate.

Python and C each have their own advantages, and the choice should be based on project requirements. 1) Python is suitable for rapid development and data processing due to its concise syntax and dynamic typing. 2)C is suitable for high performance and system programming due to its static typing and manual memory management.

The main difference between MySQL and MariaDB is performance, functionality and license: 1. MySQL is developed by Oracle, and MariaDB is its fork. 2. MariaDB may perform better in high load environments. 3.MariaDB provides more storage engines and functions. 4.MySQL adopts a dual license, and MariaDB is completely open source. The existing infrastructure, performance requirements, functional requirements and license costs should be taken into account when choosing.

SQL is a standard language for managing relational databases, while MySQL is a database management system that uses SQL. SQL defines ways to interact with a database, including CRUD operations, while MySQL implements the SQL standard and provides additional features such as stored procedures and triggers.

Laravel is suitable for projects that teams are familiar with PHP and require rich features, while Python frameworks depend on project requirements. 1.Laravel provides elegant syntax and rich features, suitable for projects that require rapid development and flexibility. 2. Django is suitable for complex applications because of its "battery inclusion" concept. 3.Flask is suitable for fast prototypes and small projects, providing great flexibility.
