Programmer Group

Scene description On-line mysql database contains a table with daily statistical results, more than 10 million items per day, which is unexpected to us. How many statistical results are there? Operations and maintenance found that the disk occupied 200 G, and finally asked the operation, you can only retain the last three days, the previous dat ...

Use django to connect to SQL Server, and pyodbc to connect to multiple databases. pyodbc, the SQL that runs the query, is very simple: import pyodbc connection = pyodbc.connect('DRIVER={SQL Server Native Client 10.0};SERVER=127.0.0.1;DATABASE=DB_name;UID=User_Name;PWD=PassWord') curs = connection.execute('select * from table') #curs.fetchone( ...

Attention: 1. When the ID card number 18 bits is exported to excel, it is a scientific counting method, which can convert text format in Excel table to restore normal. Operating method https://jingyan.baidu.com/article/8ebacdf0d76c6349f65cd5ff.html 2. When using the regional linkage brought by Zh ...

Review """ 1,Advanced selector: 1) body div Progeny, control the latter, the former is decorated 2) body > div The latter is controlled by descendants, and the former is decorated. 3).d1 ~ .d2 Brothers, control the latter, the front is decorated 4).d1 + .d2 Neighbouring, controlling the latter, the front is decorated ...

ABSTRACT: This paper mainly studied the method of using DDL statements to operate custom functions. Understanding custom functions What is it? Custom functions are procedural database objects that are very similar to stored procedures. Like stored procedures, it is a code fragment consisting of SQL statements and procedural statements, and c ...

What is Stream? Stream is an element queue from a data source and supports aggregation operations The <strong="> element queue is a specific type of object, forming a queue. Stream in Java does not store elements, but computes on demand. Sources of data sources and streams. They can be collections, arrays, I/O channel s, generat ...

There are many intranet systems in the company. If each system has an independent login account, the company leader may have an opinion. In order to solve the problem of too many accounts, the login mode can adopt domain authentication. Here we share python's domain authentication and account synchro ...

The code has been put into github, demo2 in test corresponds to sql mode, demo3 corresponds to hql mode, demo1 is paging query, another article will talk about {% post_link paging query paging query%}github address Preface When we usually use jpa query, there are two situations: one is to query all fi ...

Realization of Transaction Principles content affair Summary Principle Example Database transaction JDBC transaction content Transaction principle Implementing Database Transaction with SQL JDBC Implements Transaction Management affair Summary Transaction is a program unit that operate ...

Zero. Database tables and configuration files 0.1 Database t_customer table CREATE TABLE `t_customer` ( `cid` char(32) NOT NULL, `cname` varchar(40) NOT NULL, `gender` varchar(6) NOT NULL, `birthday` date DEFAULT NULL, `cellphone` varchar(15) NOT NULL, `email` varchar(40) DEFAULT NULL, ...