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In our daily work, there will always be some erroneous deletion of database tables and data caused by hand shaking, wrong writing conditions, wrong table names, wrong connection with production database. Then, if the data can not be recovered, what DBA is needed. Related articles MySQL Backup Strategy MySQL Data Recovery 1 Preface The premise ...

I. Self-correlation Write a good blog: https://www.cnblogs.com/Kingfan1993/p/9936541.html 1. One-to-many Association 1. Intra-table self-association refers to that the objects and tables associated with the data in the table are the same fields, so we can directly set the foreign key Association into the fields of our own table by using intra-t ...

The last time we used Django 2.2 and Oracle 11g, there was a version conflict during migrate, and finally Upgrade Oracle to 12c to solve the problem So can we solve this conflict in other ways? Think of a solution and practice it: Using Django 2.2 t ...

1. Introduction to Mybatis Mybatis is an excellent persistence framework, which encapsulates the process of jdbc operating database, so that we only need to pay attention to the SQL itself in the development process, and do not need to spend a lot of energy to deal with the complicated jdbc such as registration driver, connection creation, sta ...

I. Mybatis Framework 1. Introduction to mybatis MyBatis is an excellent persistence layer framework that supports customization of SQL, stored procedures, and advanced mappings.MyBatis avoids almost all JDBC code and setting parameters manually and getting result sets.MyBatis can use simple XML or annotations to configure and map native types, ...

Flume Log Collection System Summary operating mechanism Architecture of Flume Acquisition System Flume installation deployment A Simple Case of Flume Flume custom MySQL Source Custom Source Description Custom MySQL Source Composition Customize My ...

Links to the original text: https://mp.weixin.qq.com/s?__biz=MzUzMTA2NTU2Ng==&mid=2247487444&idx=1&sn=5325b3e29504162cd9c882c2c7f0e1d7&chksm=fa497065cd3ef973e229966f3c9c612cca8526d7201790e773ede29b9a855d27eb6d86449776&mpshare=1&scene=23&srcid=&sharer_sharetime=1565145500644&sharer_s ...

Introduction Technology stack: react + redux + react-router + express + Nginx Practice points: redux connection react-router routing jump scss style writing Design of Container Component and Display Component Structural Design of express Scaffolding Project User information persistence (cookie + redis) Common Security Problem Handling (xss sql ...

Reference article: https://www.cnblogs.com/huyong/archive/2011/05/04/2036377.html In PL/SQL programs, cursors are often used to handle transactions with multiple rows of records. There are four steps to use: define, open, extract, and close. Example: 09:52:04 SCOTT@std1> DECLARE 09:52:07 2 CURSOR c_cursor 09:52:07 3 IS SELECT e ...

SQL Prompt It is a practical SQL grammar prompt tool. SQL Prompt automatically retrieves the database object name, grammar and code fragments to provide users with appropriate code selection. Automatic script settings make code easy to read -- especially when developers are not familiar with scripts. SQL Prompt can be installed and used, which ...