详解MyBatis逆向工程

<?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="testTables" targetRuntime="MyBatis3">    <commentGenerator>      <!-- 是否去除自动生成的注释 true：是 ： false:否 -->      <property name="suppressAllComments" value="true" />    </commentGenerator>    <!--数据库连接的信息：驱动类、连接地址、用户名、密码 -->    <jdbcConnection driverClass="com.mysql.jdbc.Driver"      connectionURL="jdbc:mysql://localhost:3306/mybatis" userId="root"      password="123">    </jdbcConnection>    <!-- <jdbcConnection driverClass="oracle.jdbc.OracleDriver"      connectionURL="jdbc:oracle:thin:@127.0.0.1:1521:yycg"       userId="yycg"      password="yycg">    </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="cn.zm.mybatis.po"      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" />    </javaModelGenerator>    <!-- targetProject:mapper映射文件生成的位置 -->    <sqlMapGenerator targetPackage="cn.zm.mybatis.mapper"      targetProject="./src">      <!-- enableSubPackages:是否让schema作为包的后缀 -->      <property name="enableSubPackages" value="false" />    </sqlMapGenerator>    <!-- targetPackage：mapper接口生成的位置 -->    <javaClientGenerator type="XMLMAPPER"      targetPackage="cn.zm.mybatis.mapper"      targetProject="./src">      <!-- enableSubPackages:是否让schema作为包的后缀 -->      <property name="enableSubPackages" value="false" />    </javaClientGenerator>    <!-- 指定数据库表 -->    <table tableName="items"></table>    <!-- <table tableName="orders"></table>    <table tableName="orderdetail"></table>    <table tableName="user"></table>-->    <!-- <table schema="" tableName="sys_user"></table>    <table schema="" tableName="sys_role"></table>    <table schema="" tableName="sys_permission"></table>    <table schema="" tableName="sys_user_role"></table>    <table schema="" tableName="sys_role_permission"></table> -->    <!-- 有些表的字段需要指定java类型     <table schema="" tableName="">      <columnOverride column="" javaType="" />    </table> -->  </context></generatorConfiguration>

public class ItemsMapperTest {  private ApplicationContext applicationContext;  private ItemsMapper itemsMapper;  @Before  public void setUp() throws Exception {    applicationContext = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");    itemsMapper = (ItemsMapper) applicationContext.getBean("itemsMapper");  }  //根本主键删除  @Test  public void deleteByPrimaryKey() {    itemsMapper.deleteByPrimaryKey(4);  }  @Test  public void insert() {  }  @Test  public void selectByExample() {    ItemsExample itemsExample = new ItemsExample();    ItemsExample.Criteria criteria = itemsExample.createCriteria();    //使用criteria自定义查询条件    criteria.andNameEqualTo("水杯");    criteria.andIdEqualTo(1);    List<Items> list = itemsMapper.selectByExample(itemsExample);    System.out.println(list);  }  @Test  public void selectByPrimaryKey() {    Items items = itemsMapper.selectByPrimaryKey(1);    System.out.println(items);  }  @Test  public void updateByPrimaryKey() {  }}