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frame address: https://github.com/pagehelper/Mybatis-PageHelper/blob/master/wikis/zh/HowToUse.md Reference documents address: https://blog.csdn.net/she_lock/article/details/79975907 pom dependence <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</a ...

To use the Mybatis plug-in in maven project to automatically produce entity classes and mapping files, the following steps are required: 1. Create generatorConfig.xml file (1) create plug-in file (2) configure the path of relevant production files and the configuration of relevant parameters 2. Configure pom.xml (1) add re ...

No matter when you start, it's important not to stop after you start Three SqlSession s DefaultSqlSession and SqlSessionManager and SqlSessionTemplate are three common sqlsesion s I have From the class diagram, you can see that all three of them have implemented SqlSession, that is, they can all represent a session.Unlike others, SqlSessionM ...

springboot is very simple to start a transaction, only one annotation is needed @Transactional Just fine. Because in springboot, events have been enabled for jpa, jdbc and mybatis by default. When they are introduced, things will be enabled by default. Of course, if you need to use other orm, such as beatlsql, you need to configure the relevant ...

Introduction: in the previous article, we have prepared the basic components based on spring cloud Alibaba. The main content of this issue is to register all services into Nacos, and enable account service and product service to provide basic addition, deletion, modification and query capabilities. Basic framework construction Create a multi m ...

When Mybatis sets a parameter in the prepared statement, it uses the default typeHandler for processing. When you want to search a person's information by name <select id="getRole" parameterType="string" resultRole="role"> select rolename,phonenumber from t_role where rolename = #{rolname} </select> When Mybatis calls this query ...

First, paste an automatically generated Mapper code <select id="selectByExample" parameterType="com.pojo.TbItemParamExample" resultMap="BaseResultMap"> <select id="selectByExampleWithBLOBs" parameterType="com.pojo.TbItemParamExample" resultMap="ResultMapWithBLOBs"> Here we find that their return values are different. <resultM ...

This article describes the various operations of fastjson custom serialization. 1. What is fastjson? fastjson is Alibaba's open source JSON parsing library that parses strings in JSON format, supports serialization of Java Bean s to JSON strings, and can also deserialize from JSON strings to JavaBean s. 2. How to Use Add the following maven d ...

I. configuration file structure First of all, the structure of the configuration file is as follows Here are a few key configurations 1. jdbc.properties #============================================================================ # datasource 1 #============================================================================ #Da ...

In some business scenarios, multiple tables are needed to perform statistical operations jointly. In such scenarios, the logic of sql is often complex, and it is difficult to write it out easily by using mybatis. At the same time, various business variables are very large, so it is a little weak to deal with it based on mybatis. ...