Mybatis神器-逆向工程

Mybatis神器-逆向工程

mybatis逆向工程就是自動生成實體對象的domain,mapper和映射文件的工具。
內部使用反射進行了封裝,只須要簡單的配置就可以將建立好的數據庫中的表格數據轉化成爲能夠使用的java類,節省了大量的時間。java

1.官網

官方網站: http://mybatis.org/generator/mysql

2.引入依賴包

<dependency>
		  <groupId>org.mybatis.generator</groupId>
		  <artifactId>mybatis-generator-core</artifactId>
		  <version>1.3.5</version>
	  </dependency>

3.建立MBG.xml文件

<?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.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/ssm_curd?useUnicode=true&amp;characterEncoding=utf-8&amp;useSSL=false&amp;serverTimezone=GMT%2B8"
                        userId="root"
                        password="123456">
        </jdbcConnection>

        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!--指定javaBean生成位置-->
        <javaModelGenerator targetPackage="com.sun.curd.bean" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!--指定映射文件生成位置-->
        <sqlMapGenerator
                targetPackage="mapper"
                targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!--指定dao接口生成位置-->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.sun.curd.dao"
                             targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!--table表生成規則-->
        <table tableName="tbl_emp" domainObjectName="Employee"></table>
        <table tableName="tnl_dept" domainObjectName="Department"></table>

    </context>
</generatorConfiguration>

4.建立MBGTest.java

public class MbgTest {
    public static void main(String[] args) throws InterruptedException, SQLException, IOException, XMLParserException, InvalidConfigurationException {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("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);
    }
}

注意

配置中的信息由幾部分須要改動,複製粘貼時須要當心;sql

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