[SSM] mybatis reverse engineering

Project directory map

mybatis configuration file

1. Enter mybatis official website

Code:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
	<!--全局设置，驼峰命名规则-->
    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
    <!--类型别名-->
    <typeAliases>
        <package name="com.crud.bean"/>
    </typeAliases>
</configuration>

Use mybatis reverse engineering to generate the corresponding bean and mapper

MyBatis Generator official website

mysql table

Introduce the Generator jar package

 <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-core</artifactId>
      <version>1.3.6</version>
 </dependency>

Create Generator configuration file mbg.xml

Code:

<?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">
        <!--  配置数据库连接     -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3308/ssm_demo"
                        userId="root"
                        password="123456">
        </jdbcConnection>
        <!--java解析-->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!--指定javaBean生成的位置-->
        <javaModelGenerator
                targetPackage="com.crud.bean"
                targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!--        指定sql映射文件生成的位置-->
        <sqlMapGenerator
                targetPackage="mapper"
                targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!--指定dao接口生成的位置，mapper接口-->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.crud.dao"
                             targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <!--table指向每个表的生成次略-->
        <table tableName="tbl_emp" domainObjectName="Employee"></table>
        <table tableName="tbl_dept" domainObjectName="Department"></table>

    </context>
</generatorConfiguration>

Generate dao file and mapper file with java code

Create part of the test code in the test file
:

public static void main(String[] args) throws Exception{
    
    
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("src\\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);
    }

Uncomment the file

After generating the mapping file of the dao layer class and mapper, remove the redundant comments in the file

There is an example below:

<commentGenerator>
  <property name="suppressDate" value="true" />
</commentGenerator>

Add this code to the mbg.xml file and modify

<commentGenerator>
            <property name="suppressAllComments" value="true" />
</commentGenerator>