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Hello, I'm the elder brother of Chinese menong green tea. Welcome to my personal WeChat official account: 8 Kangyuan road! Mybatis-demo 1. Explanation of professional terms 1.1 Dao Dao layer is called data access layer and persistence layer, and its full name is Data access object. It is a kind of bottom-level and basic operation. It is sp ...

1, Column attribute problem auto_ The increment dimension must be a primary key When creating a table, once you use auto_ For the increment description field, after a single piece of data corresponding to the primary key field is deleted, no data can be added to the corresponding content of this primary key field. As shown in the following f ...

Twenty thousand words. The blogger worked hard to write it for you. I'm here for three consecutive ~ ~. 1, Introduction to JDBC That is, Java Database Connectivity, Java and database links. Is an API that can execute SQL statements. JDBC is a specification, which provides a complete set of interfaces, allowing portable access to the unde ...

There are five ways to use scheduled jobs in Python Most applications built today require some sort of scheduling mechanism. Polling API s or databases, constantly checking system health, archiving logs, etc. are common examples. Kubernetes and Apache Mesos And other software using auto scaling technology need to check the status of deployed ...

brief introduction Official website: http://mp.baomidou.com/ Reference tutorial: http://mp.baomidou.com/guide/ MyBatis-Plus (MP) is a MyBatis On the basis of MyBatis, the enhancement tool is only enhanced without change. It is born to simplify development and improve efficiency. quick get start Quick start reference: http://mp.baomidou.com ...

Database and table building --Build database create database test; --Build table create table student(s_id string,s_name string,s_birth string,s_sex string) row format delimited fields terminated by '\t'; create table course(c_id string,c_name string,t_id string) row format delimited fields terminated by '\t'; create table teacher(t_id string ...

Gateway introduction In fact, the gateway is to put all the APIs we have written in a unified address, expose them to the public network, and provide an entrance for access. Under the. NET Core, Ocelot can be used to help us easily access the API gateway. Similar libraries include ProxyKit , Microsoft has also released a reverse proxy librar ...

2, MySQL Cluster Construction 2.1 cluster requirements Build a master-N-slave MySQL Cluster;The slave node can be expanded horizontally;All write operations can only be performed on the Master node;All read operations can be performed on all nodes; 2.2 build clusters in physical machine environment Next, let's look at a schematic diagram of ...

Project resource requirements   VMVare15 resource link: https://pan.baidu.com/s/1cVzeKjqu0Cmp4qMRDbFx8Q Extraction code: tdn4   CentOS7 image file link: https://pan.baidu.com/s/14QyfiXYYObdynswJlOoI1g Extraction code: 6cxp   oracle11 Linux version link: https://pan.baidu.com/s/16hWmzGudLjUEpkRzHAOGZw Extraction code: y34w &e ...

JDBC core knowledge points 1. What is JDBC? JDBC is a set of specifications proposed by SUN company, which provides unified access to a variety of relational databases. 2. What are the components of JDBC? JDBC is composed of a set of interfaces proposed by SUN company and implementation classes (driver jars) provided by various database man ...