课时12:MyBatis逆向工程

.1)表丶类丶接口丶mapper.xml四者密切相关,因此,当知道一个的时候 其他三个应该可以自动生成

.2)具体实现步骤

　　1.导入jar包

   <!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core -->
    <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-core</artifactId>
      <version>1.3.7</version>
    </dependency>

 <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.5</version>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.6</version>
    </dependency>

　　2.编写配置配置文件generator.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="MybatisGenerator" targetRuntime="mybatis3">
        <commentGenerator>
            <!-- 是否去除自动生成的注释 -->
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <!-- 数据库连接信息：驱动类 ，连接地址，用户名，密码-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC"
                        userId="root" password="root">
        </jdbcConnection>

        <!-- 默认值 -->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!-- 生成的实体类的存放位置 -->
        <javaModelGenerator targetPackage="net.bdqn.hbz.pojo" targetProject="./src">
            <!-- enableSubPackages：是否让schema作为包的后缀 -->
<!--            <property name="enableSubPackages" value="true"/>-->
            <!-- 从数据库返回的值被清理前后的空格 -->
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!-- 生成的Mapper映射文件（XML）的存放位置 -->
        <sqlMapGenerator targetPackage="net.bdqn.hbz.mapper" targetProject="./src">
<!--            <property name="enableSubPackages" value="false"/>-->
        </sqlMapGenerator>

        <!-- 生成的mapper接口(JAVA文件)的存放位置 -->
        <javaClientGenerator targetPackage="net.bdqn.hbz.mapper" type="XMLMAPPER" targetProject="./src">
<!--            <property name="enableSubPackages" value="false"/>-->
        </javaClientGenerator>

        <!-- 指定数据库表 -->
        <table tableName="student"/>
        <table tableName="studentcart"/>
        <table tableName="studentclass"/>

    </context>
</generatorConfiguration>

　　3.执行类

package net.bdqn.hbz.test;

import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.exception.InvalidConfigurationException;
import org.mybatis.generator.exception.XMLParserException;
import org.mybatis.generator.internal.DefaultShellCallback;

import java.io.File;
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class Test {
    public static void main(String [] args) throws IOException, XMLParserException, InvalidConfigurationException, SQLException, InterruptedException {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        // 指定配置文件
        File configFile = new File("E:\workJavaEE\Mybatis\work\MyGenerator\target\classes\net\bdqn\hbz\test\generator.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
        myBatisGeneratorgenerate(null);
    }
}