逆向工程

一、逆向工程

1.1、概述

mybatis需要程序号自己编写的SQL。

mybatis官方提供了逆向工程，可以针对单表自动生成mybatis执行所需要的代码

（mapper,java,maper.xml,po...)

一般都是由数据库到java代码， 的生成过程

二、导入jar包

2.1、mybatis-generator

 

 

三、配置xml

3.1、generatorConfig.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> <!--指定数据库jar包 --> <classPathEntry location="G:/jar/mysql-connector-java-5.1.37-bin.jar" /> <context id="DB2Tables" targetRuntime="MyBatis3"> <commentGenerator> <!-- 是否去除自动生成的注释 true：是 ： false:否 --> <property name="suppressAllComments" value="true" /> </commentGenerator> <!--JDBC连接配置，driver,url,user,password --> <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/mybatis?character=utf8" userId="root" password="root"> </jdbcConnection> <!--默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL 
            和 NUMERIC 类型解析为java.math.BigDecimal --> <javaTypeResolver> <property name="forceBigDecimals" value="false" /> </javaTypeResolver> <!-- targetProject:生成PO类的位置 --> <javaModelGenerator targetPackage="com.mybatis.po" targetProject=".\src"> <property name="enableSubPackages" value="false" /> <property name="trimStrings" value="true" /> </javaModelGenerator> <!-- targetProject:mapper映射文件生成的位置 --> <sqlMapGenerator targetPackage="com.pb.mybatis.mapping" targetProject=".\src"> <!-- enableSubPackages:是否让schema作为包的后缀 --> <property name="enableSubPackages" value="false" /> <!-- 从数据库返回的值被清理前后的空格 --> <property name="trimStrings" value="true" /> </sqlMapGenerator> <!-- targetPackage：mapper接口生成的位置 --> <javaClientGenerator type="XMLMAPPER" targetPackage="com.pb.mybatis.mapper" targetProject=".\src"> <!-- enableSubPackages:是否让schema作为包的后缀 --> <property name="enableSubPackages" value="false" /> </javaClientGenerator> <!--指定要生成的表 --> <table tableName="author"></table> <table tableName="blog"></table> <table tableName="posts"></table> </context> </generatorConfiguration>

 

 

 

 

 

四、运行java程序生成

4.1、java程序

 

import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.List; import org.mybatis.generator.api.MyBatisGenerator; import org.mybatis.generator.config.Configuration; import org.mybatis.generator.config.xml.ConfigurationParser; import org.mybatis.generator.exception.XMLParserException; import org.mybatis.generator.internal.DefaultShellCallback; public class GeneratorSqlmap { public void generator() throws Exception{

        List<String> warnings = new ArrayList<String>(); boolean overwrite = true; //指定 逆向工程配置文件 File configFile = new File("generatorConfig.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);

    } public static void main(String[] args) throws Exception { try {
            GeneratorSqlmap generatorSqlmap = new GeneratorSqlmap();
            generatorSqlmap.generator();
        } catch (Exception e) {
            e.printStackTrace();
        }
        
    }

}

 

 

五、测试

5.1、测试类

 

package com.pb.ssm.mapper; import static org.junit.Assert.fail; import java.util.Date; import java.util.List; import javax.crypto.Cipher; import org.junit.Before; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.pb.ssm.po.Author; import com.pb.ssm.po.AuthorExample; import com.pb.ssm.po.AuthorExample.Criteria; public class AuthorMapperTest { private ApplicationContext applicationContext; private AuthorMapper authorMapper;

    @Before public void setUp() throws Exception {
        applicationContext=new ClassPathXmlApplicationContext("ApplicationContext.xml");
        authorMapper=(AuthorMapper) applicationContext.getBean("authorMapper");
    } //根据条件查询记录数  @Test public void testCountByExample() {
        AuthorExample example=new AuthorExample(); //可以加条件，不加条件默认查询全部 Criteria criteria=example.createCriteria(); //加条件，介绍不是空的  criteria.andAuthorBioIsNotNull(); int num=authorMapper.countByExample(example);
        System.out.println("num="+num);
    } //根据条件删除  @Test public void testDeleteByExample() {
        AuthorExample example=new AuthorExample(); //可以加条件，不加条件默认查询全部 Criteria criteria=example.createCriteria();
        criteria.andAuthorUsernameEqualTo("程序员"); int num=authorMapper.deleteByExample(example);
        System.out.println("num="+num);
        
    } //根据主键ID删除  @Test public void testDeleteByPrimaryKey() { int num=authorMapper.deleteByPrimaryKey(18);
        System.out.println("num="+num);
    } //插入  @Test public void testInsert() {
        
        Author author=new Author();
        author.setAuthorUsername("再测试一下");
        author.setAuthorPassword("admin123");
        author.setAuthorEmail("[email protected]"); int num=authorMapper.insert(author);
        System.out.println("num="+num); //这个方法插入，默认不会把数据库自增加ID返回，如果需要，可以手动增加 System.out.println("插入后的ID"+author.getAuthorId());
        
    } //插入  @Test public void testInsertSelective() {
        Author author=new Author();
        author.setAuthorUsername("再测试一下");
        author.setAuthorPassword("admin123");
        author.setAuthorEmail("[email protected]");
        author.setRegisterTime(new Date()); int num=authorMapper.insert(author);
        System.out.println("num="+num); //这个方法插入，默认不会把数据库自增加ID返回，如果需要，可以手动增加 System.out.println("插入后的ID"+author.getAuthorId());
        
    } //自定义 条件查询  @Test public void testSelectByExample() { //声明一个对象 AuthorExample authorExample=new AuthorExample(); //创建criteria对象添加条件 and 连接 Criteria criteria=authorExample.createCriteria(); //需要手动加% criteria.andAuthorUsernameLike("%张三%");
        
        List<Author> list=authorMapper.selectByExample(authorExample);
        System.out.println(list.size());
    } //根据主键ID查询  @Test public void testSelectByPrimaryKey() {
         Author author= authorMapper.selectByPrimaryKey(6);
        System.out.println(author.getAuthorUsername()+"..."+author.getAuthorBio());
    }

    @Test public void testUpdateByExampleSelective() {
        fail("Not yet implemented");
    }

    @Test public void testUpdateByExample() {
        fail("Not yet implemented");
    }

    @Test public void testUpdateByPrimaryKeySelective() {
        fail("Not yet implemented");
    }

    @Test public void testUpdateByPrimaryKey() {
        fail("Not yet implemented");
    }

}