MBG combat zero basis

** If there is a mistake , Thank you for correcting **

If there is a mistake , Thank you for correcting , Please send a private message to the blogger , There is a red envelope for hard work , Worship “ one-word teacher ”.

Please find the paragraphs you need according to the table of contents

Introduction ： This blog is organized for individuals Java Learning notes , If there is a mistake , Thank you for correcting . System learning , Welcome to continue to pay attention , Follow up updates
Java communication qq Group 383245788

This article aims to learn and communicate , personal crud The learning

This paper makes a lot of references MBG Official website ：http://mybatis.org/generator/
MBG Doing it ssm Small demo Can be used when , convenient ,MP You can also do , And do better ,MBG It is suggested to just understand .

MBG brief introduction

MyBatis Generator (MBG) yes MyBatis Code generator for . It will be for all versions of MyBatis The generated code . It will introspect a database table （ Or more tables ） And generate artifacts that can be used to access tables . This reduces the initial hassle of setting up objects and configuration files to interact with database tables .MBG Try to be simple about a lot CRUD（ establish 、 retrieval 、 to update 、 Delete ） Has a significant impact on database operations . You still need to write... For connection queries or stored procedures SQL And object code .
MBG Generate code in different styles and languages , It depends on how it is configured . for example ,MBG Can generate Java or Kotlin Code .MBG Can generate and MyBatis3 Compatible XML - Although it is now considered MBG Legacy uses . Newer styles of generated code do not need XML.

xml

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<context id="DB2Tables" targetRuntime="Mybatis3">
    <commentGenerator>
        <property name="suppressAllComments" value="true"/>
    </commentGenerator>
    <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                    connectionURL="jdbc:mysql://localhost:3306/ssm_mdsp"
                    userId="root"
                    password="root">
    </jdbcConnection>
    <javaTypeResolver>
        <property name="forceBigDecimals" value="false" />
    </javaTypeResolver>

    <!--  Appoint javaBean The location of the generation  -->
    <javaModelGenerator targetPackage="top.atluofu.pojo"
                        targetProject=".\src\main\java">
        <property name="enableSubPackages" value="true" />
        <property name="trimStrings" value="true" />
    </javaModelGenerator>

    <!-- Appoint sql Map where the file is generated  -->
    <sqlMapGenerator targetPackage="mapper" targetProject=".\src\main\resources">
        <property name="enableSubPackages" value="true" />
    </sqlMapGenerator>

    <!--  Appoint dao Where the interface is generated ,mapper Interface  -->
    <javaClientGenerator type="XMLMAPPER"
                         targetPackage="top.atluofu.mapper" targetProject=".\src\main\java">
        <property name="enableSubPackages" value="true" />
    </javaClientGenerator>


    <!-- table Specify the generation strategy for each table  -->
    <table tableName="order" domainObjectName="Order">

    </table>
    <table tableName="role" domainObjectName="Role">

    </table>
    <table tableName="trade" domainObjectName="Trade">

    </table>
    <table tableName="user" domainObjectName="User">

    </table>
</context>
</generatorConfiguration>

xml Reference configuration

• classPathEntry： Specify drive
  Such as <classPathEntry location="/Program Files/IBM/SQLLIB/java/db2java.zip" />
• commentGenerator： Commenter , Generate annotations , As noted in the table , Column comment , Time stamps, etc

Start class

Use xml Configure from Java The program runs MBG

public class MBG {
    

    @Test
    public static void main(String[] args) throws XMLParserException, IOException, InvalidConfigurationException, SQLException, InterruptedException {
    
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("src/main/resources/mbg.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
        myBatisGenerator.generate(null);
    }
}