第四简单的4-mybatis,sql传参parameterType为包装类和map类型的测试

parameterType 包装类和普通实体类是一模一样的操作，也可支持级联

map作为入参也一样，只是不是用对象的属性，而是用map的key

步骤：

Jar包导入，生成数据库表，创建与src同级资源目录config,test目录(注意，config,test均为资源目录)

1. 创建实体类和入参包装类：

DBUser.java

package com.xiangshuai.mybatis.pojo;

import java.util.Date;

public classDBUser {

private int id;

private Integer sex;

private Date birthday;

private String address;

private String username;

public DBUser(Integer sex, Date birthday, String address, String username) {

super();

this.sex = sex;

this.birthday = birthday;

this.address = address;

this.username = username;

}

public DBUser() {

super();

// TODO Auto-generated constructor stub

}

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public Integer getSex() {

return sex;

}

public void setSex(Integer sex) {

this.sex = sex;

}

public Date getBirthday() {

return birthday;

}

public void setBirthday(Date birthday) {

this.birthday = birthday;

}

public String getAddress() {

return address;

}

public void setAddress(String address) {

this.address = address;

}

@Override

public String toString() {

return "DBUser [id="+ id + ", sex="+ sex+ ", birthday=" + birthday+ ", address=" + address+ ", username="

+username + "]";

}

VO.java

package com.xiangshuai.mybatis.pojo;

* * 入参类型包装类

* */

public classVO {

privateDBUser user;

public DBUser getUser() {

return user;

}

public void setUser(DBUser user) {

this.user = user;

}

2. 建实体类对应的映射文件DBUserMapper.xml（局部xml文件）

DBUserMapper.xml

<?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">

<!-- 注意：在mapper代理时，它具有特殊及重要的作用，在这里 namespace="com.xiangshuai.mybatis.mapper.DBUserMapper"

对应mapper接口DBUserMapper的全类名-->

<select id="findDBUserByUsername" parameterType="com.xiangshuai.mybatis.pojo.VO"

resultType="com.xiangshuai.mybatis.pojo.DBUser">

SELECT* FROM DBUSER WHERE username LIKE '%${user.username}%'

</select>

<!-- 传入参数为map 根据map的key id查出List<DBUser> WHERE id=#{id}其中 id为表字段，而#{id}中的id为入参

map的key -->

<select id="findDBUserById"parameterType="hashmap"

resultType="com.xiangshuai.mybatis.pojo.DBUser">

SELECT* FROM DBUSER WHERE id=#{id}

</select>

</mapper>

3. 将DBUserMapper.xml（局部xml文件）mapper到SqlMapConfig.xml（全局配置文件）中

4. <?xml version="1.0"encoding="UTF-8" ?>

5. <!DOCTYPE configuration

6. PUBLIC "-//mybatis.org//DTD Config 3.0//EN"

7. "http://mybatis.org/dtd/mybatis-3-config.dtd">

8. <configuration>

10.

11. <properties resource="db.properties">

12. </properties>

13.

14.

15.

16.

17. <!-- <typeAliases>

18. 单个别名定义

19. <typeAliastype="com.itheima.mybatis.po.User" alias="user"/>

20.

21. 批量别名定义（推荐）

22. package：指定包名称来为该包下的po类声明别名，默认的别名就是类名（首字母大小写都可）

23. <packagename="com.itheima.mybatis.po" />

24. </typeAliases>

25. -->

26.

27. <environments default="development">

28. <environment id="development">

29.

30. <transactionManager type="JDBC"></transactionManager>

31.

32. <dataSource type="POOLED">

33. <property name="driver"value="${db.driver}" />

34. <property name="url"value="${db.url}" />

35. <property name="username"value="${db.username}" />

36. <property name="password"value="${db.password}" />

37. </dataSource>

38. </environment>

39. </environments>

40.

41.

42. <mappers>

43. <mapper resource="DBUserMapper.xml" />

44.

45.

46.

47. </mappers>

48. </configuration>

4. 严格参照DBUserMapper.xml按照mapper规范创建mapper接口DBUserMapper.java

packagecom.xiangshuai.mybatis.mapper;

import java.util.List;

import java.util.Map;

importcom.xiangshuai.mybatis.pojo.DBUser;

importcom.xiangshuai.mybatis.pojo.VO;

public interface DBUserMapper {

public List<DBUser> findDBUserByUsername(VO vo);

public DBUser findDBUserById(Map<String,Object> map);

}

5.测试类Demo1.java

package com.xiangshuai.test;

import java.io.IOException;

import java.io.InputStream;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.apache.ibatis.io.Resources;

import org.apache.ibatis.session.SqlSession;

importorg.apache.ibatis.session.SqlSessionFactory;

importorg.apache.ibatis.session.SqlSessionFactoryBuilder;

import org.junit.Before;

import org.junit.Test;

importcom.xiangshuai.mybatis.mapper.DBUserMapper;

import com.xiangshuai.mybatis.pojo.DBUser;

import com.xiangshuai.mybatis.pojo.VO;

public class Demo1 {

/*mybatis开发方式mapper开发非mapper开始：查询，操作和hibernate很像，也是先造实体类，然后配实体类的XML映射文件，然后将实体类的XML映射文件mapper到全局映射 XML文件

SqlMapConfig.xml中去，

* */

privateSqlSessionFactory sqlSessionFactory;

@Before

publicvoid before(){

//读取配置文件

//全局配置文件的路径

Stringresource = "SqlMapConfig.xml";

InputStreaminputStream = null;

try{

inputStream= Resources.getResourceAsStream(resource);

}catch (IOException e) {

//TODO Auto-generated catch block

e.printStackTrace();

}

//创建SqlSessionFactory

sqlSessionFactory = newSqlSessionFactoryBuilder().build(inputStream);

}

@Test

public void findDBUserByUsername(){

//创建mapper对象 -- DBUserMapper对象

SqlSessionsqlsession = sqlSessionFactory.openSession();

DBUserMappermapper = sqlsession.getMapper(DBUserMapper.class);

//调用mapper完成增删改查方法

DBUseruser = new DBUser();user.setUsername("诗");VOvo = new VO();vo.setUser(user);

List<DBUser>users = mapper.findDBUserByUsername(vo);//根据vo.user.username进行模糊查询

sqlsession.close();

System.out.println(users);

}

@Test

publicvoid findDBUserById(){

//创建mapper对象 -- DBUserMapper对象

SqlSessionsqlsession = sqlSessionFactory.openSession();

DBUserMappermapper = sqlsession.getMapper(DBUserMapper.class);

//调用mapper完成增删改查方法

Map<String,Object>map =new HashMap<String,Object>();

map.put("id",31);map.put("username", "小明");

DBUseruser = mapper.findDBUserById(map);//根据map的key id进行查询

sqlsession.close();

System.out.println(user);

}

第四简单的4-mybatis,sql传参parameterType为包装类和map类型的测试

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