条件筛选（[尚硅谷]_张晓飞_Mybatis 学习笔记五）

准备数据

create table d_user(  
	id int primary key auto_increment,  
	name varchar(10),
	age int(3)
); 

insert into d_user(name,age) values('Tom',12);  
insert into d_user(name,age) values('Bob',13);  
insert into d_user(name,age) values('Jack',18);

与数据库表对应的javabean

package com.hb.bean;

public class User {
	private int id;
	private String name;
	private int age;
	private int minAge;
	private int maxAge;
    
	public int getMinAge() {
		return minAge;
	}
	public void setMinAge(int minAge) {
		this.minAge = minAge;
	}
	public int getMaxAge() {
		return maxAge;
	}
	public void setMaxAge(int maxAge) {
		this.maxAge = maxAge;
	}
	//get,set方法
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	
	public User(int id, String name, int age) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
	}
	
	public User() {
	}
	
	@Override
	public String toString() {
		return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
	}
	
	
}

备注：javabean比user表多了minAge喝maxAge两个属性，用于数据筛选。 

数据库表与javabean的映射文件

<?xml version="1.0" encoding="UTF-8" ?> 
<!DOCTYPE mapper 
    PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.hb.bean.userMapper">
	<!-- 这里namespace必须是“包名 + xml文件名”，不然要运行的时候要报错 “is not known to the MapperRegistry” -->

	<select id="getUser" parameterType="com.hb.bean.User"
		resultType="com.hb.bean.User">
		select * from user where age>=#{minAge} and age&lt;=#{maxAge}
		<if test='name!=null'>and name like #{name}</if>
	</select>


</mapper>

测试类

package com.hb.test5;

import java.io.InputStream;
import java.util.List;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;

import com.hb.bean.User;

public class Test5 {

	public static SqlSessionFactory sqlSessionFactory;
	public static SqlSession sqlSession;
	
	@Before
	public void init(){
		//"/"表示是在src根目录下
		String source = "config.xml";
		InputStream inputStream = Test5.class.getClassLoader().getResourceAsStream(source);
		
		try {
			sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
//			sqlSession = sqlSessionFactory.openSession();
			//是否自动提交，默认不是自动提交的
			sqlSession = sqlSessionFactory.openSession(true);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	
	@Test
	public void selectByCondition(){
		String statment = "com.hb.bean.userMapper.getUser";
		User conditon = new User();
		conditon.setMaxAge(15);
		conditon.setMinAge(1);
//		conditon.setName("%a%");
		//查询list集合
		List<User> users = sqlSession.selectList(statment, conditon);
		System.out.println(users);
	}
	
	
	
}

测试打印的日志

2015-02-24 11:54:42,824 [main] DEBUG [com.hb.bean.userMapper.getUser] - ooo Using Connection [com.mysql.jdbc.Connection@11fda7c]
2015-02-24 11:54:42,824 [main] DEBUG [com.hb.bean.userMapper.getUser] - ==>  Preparing: select * from user where age>=? and age<=? 
2015-02-24 11:54:42,887 [main] DEBUG [com.hb.bean.userMapper.getUser] - ==> Parameters: 1(Integer), 15(Integer)
[User [id=8, name=Tom, age=12], User [id=9, name=Bob, age=13]]

mybatis的配置文件

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE configuration 
    PUBLIC "-//mybatis.org//DTD Config 3.0//EN" 
    "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>

	<settings>
		<!-- changes from the defaults for testing -->
		<setting name="cacheEnabled" value="false" />
		<setting name="useGeneratedKeys" value="true" />
		<setting name="defaultExecutorType" value="REUSE" />
	</settings>

	<environments default="development">
		<environment id="development">
			<transactionManager type="jdbc" />
			<dataSource type="POOLED">
				<!-- 
				<property name="driver" value="oracle.jdbc.driver.OracleDriver"/> 
				<property name="url" value="jdbc:oracle:thin:@192.168.56.201:1521:system"/> 
				-->
				<property name="driver" value="com.mysql.jdbc.Driver" />
				<property name="url" value="jdbc:mysql://localhost:3306/mybatis" />
				<property name="username" value="root" />
				<property name="password" value="123456" />
			</dataSource>
		</environment>
	</environments>

	<mappers>
		<mapper resource="com/hb/bean/userMapper.xml" />
	</mappers>

</configuration>

---

 下面是动态配置SQL的实例

<!-- 分页通过业务查询所有的机构 -->
	<select id="queryOrgByApp" parameterType="java.util.Map" resultType="adtec.ta_org_relationManager.model.Ta_org_relation">
		select a.orgRelationId,a.appid,a.ta_id,a.orgId,c.orgName,b.appName
		  from ta_org_relation a,ta_app b,ta_organization c
		 where a.appid = b.appid
		   and a.orgId = c.orgId
		   and a.appid=#{appid}
		   <if test="orgId !=null">
		   and a.orgId in   
		   <foreach item="item" index="index" collection="list" open="(" separator="," close=")">   
		         #{item}   
		   </foreach> 
		   </if>
		 limit #{start},#{pageSize}
	</select>