MyBatis逆向工程的创建和使用

<?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="1234"> 
 </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.edu.hpu.ssm.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.edu.hpu.ssm.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.edu.hpu.ssm.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> 

GeneratorSqlmap.java: 
import java.io.File; 
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.internal.DefaultShellCallback; 
public class GeneratorSqlmap { 
 public void generator() throws Exception{ 
 List<String> warnings = new ArrayList<String>(); 
 boolean overwrite = true; 
 //加载配置文件 
 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(); 
 } 
 } 
} 

package cn.edu.hpu.ssm.test; 
 import static org.junit.Assert.fail; 
import java.util.Date; 
import java.util.List; 
import org.junit.Before; 
import org.junit.Test; 
import org.springframework.context.ApplicationContext; 
import org.springframework.context.support.ClassPathXmlApplicationContext; 
import cn.edu.hpu.ssm.mapper.ItemsMapper; 
import cn.edu.hpu.ssm.po.Items; 
import cn.edu.hpu.ssm.po.ItemsExample; 
public class ItemsMapperTest { 
 private ApplicationContext applicationContext; 
 private ItemsMapper itemsMapper; 
 //注解Before是在执行本类所有测试方法之前先调用这个方法 
 @Before 
 public void setup() throws Exception{ 
 applicationContext=new ClassPathXmlApplicationContext("classpath:spring/applicationContext.xml"); 
 itemsMapper=(ItemsMapper)applicationContext.getBean("itemsMapper"); 
 } 
 //根据主键删除 
 @Test 
 public void testDeleteByPrimaryKey() { 
 fail("Not yet implemented"); 
 } 
 //插入 
 @Test 
 public void testInsert() { 
 Items items=new Items(); 
 items.setName("iPhone-5S"); 
 items.setPrice(3999f); 
 items.setDetail("正品行货"); 
 items.setPic("sdasd.jpg"); 
 items.setCreatetime(new Date()); 
 itemsMapper.insert(items); 
 } 
 //自定义条件来查询 
 @Test 
 public void testSelectByExample() { 
 ItemsExample itemsExample=new ItemsExample(); 
 //通过Criteria构造查询条件 
 ItemsExample.Criteria criteria=itemsExample.createCriteria(); 
 criteria.andNameEqualTo("电视机"); 
 //可能返回多条记录 
 List<Items> list=itemsMapper.selectByExample(itemsExample); 
 for (int i = 0; i < list.size(); i++) { 
  Items it=list.get(i); 
  System.out.println(it.getId()+":"+it.getName()); 
 } 
 } 
 //根据主键来查询 
 @Test 
 public void testSelectByPrimaryKey() { 
 Items items=itemsMapper.selectByPrimaryKey(1); 
 System.out.println(items.getName()); 
 } 
 //更新数据 
 @Test 
 public void testUpdateByPrimaryKey() { 
 //对所有字段进行更新，需要先查询出来再更新 
 Items items = itemsMapper.selectByPrimaryKey(1); 
 items.setName("iPhone"); 
 itemsMapper.updateByPrimaryKey(items); 
 //如果传入字段不空为才更新，在批量更新中使用此方法，不需要先查询再更新 
 //itemsMapper.updateByPrimaryKeySelective(record); 
 } 
}