idea 实现逆向工程(反向工程)

pom.xml 配置  在build里添加

<!--逆向工程-->
    <plugins>
      <plugin>
        <groupId>org.mybatis.generator</groupId>
        <artifactId>mybatis-generator-maven-plugin</artifactId>
        <version>1.3.2</version>
        <dependencies>
          <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.22</version>
          </dependency>
        </dependencies>
        <configuration>
          <!--配置文件的路径-->
          <configurationFile>src/main/resources/generatorConfig.xml</configurationFile>
          <overwrite>true</overwrite>
        </configuration>
      </plugin>
    </plugins>

在resources添加文件 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>
    <context id="test" targetRuntime="MyBatis3">
        <plugin type="org.mybatis.generator.plugins.EqualsHashCodePlugin"></plugin>
        <plugin type="org.mybatis.generator.plugins.SerializablePlugin"></plugin>
        <plugin type="org.mybatis.generator.plugins.ToStringPlugin"></plugin>
        <commentGenerator>
            <!-- 这个元素用来去除指定生成的注释中是否包含生成的日期 false:表示保护 -->
            <!-- 如果生成日期，会造成即使修改一个字段，整个实体类所有属性都会发生变化，不利于版本控制，所以设置为true -->
            <property name="suppressDate" value="true" />
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true" />
        </commentGenerator>
        <!--数据库链接URL，用户名、密码 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/shy" userId="root"
                        password="123456">
        </jdbcConnection>
        <javaTypeResolver>
            <!-- This property is used to specify whether MyBatis Generator should
                force the use of java.math.BigDecimal for DECIMAL and NUMERIC fields, -->
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>
        <!-- 生成模型的包名和位置 -->
        <javaModelGenerator targetPackage="com.etc.entity"
                            targetProject="target">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!-- 生成映射文件的包名和位置 -->
        <sqlMapGenerator targetPackage="com.etc.dao"
                         targetProject="target">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>
        <!-- 生成DAO的包名和位置 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.etc.dao"
                             targetProject="target">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!-- 要生成哪些表 -->
        <table tableName="t_cart" domainObjectName="Cart"></table>
        <table tableName="t_furniture" domainObjectName="Furniture"></table>
        <table tableName="t_order" domainObjectName="Order"></table>
        <table tableName="t_type" domainObjectName="Type"></table>
        <table tableName="t_user" domainObjectName="User"></table>

    </context>
</generatorConfiguration>

待idea 下载完成后 点击最右边的Mavenprojects

 在这会出现 mybatis-generator 运行下面的插件，只有能连上数据库就ok了

生成的dao和entity在这

移动到对应的包下后测试：

package com.etc.dao;


import com.etc.entity.User;
import com.etc.entity.UserExample;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.io.IOException;
import java.util.List;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class UserDAOTest {

    @Autowired
    private UserMapper userMapper;

    @Test
    public void test() throws IOException {

        //通过criteria构造查询条件
        UserExample userExample = new UserExample();
        userExample.setOrderByClause("u_name asc"); //asc升序,desc降序排列
        userExample.setDistinct(false); //去除重复,true是选择不重复记录,false反之
        UserExample.Criteria criteria = userExample.createCriteria(); //构造自定义查询条件
        criteria.andUNameEqualTo("qlt");

        //自定义查询条件可能返回多条记录,使用List接收
        List<User> list = userMapper.selectByExample(userExample);

        for(User u : list){
            System.out.println(u);
        }
    }
}