MyBatis学习（一）一个简单的例子

mybatis入门例子

开发步骤：

1.创建java工程

2.加入jar包（依赖包、驱动包）

3.创建sqlMapConfig.xml

4.创建数据库，数据库表USER_C，插入测试记录

5.创建PO对象 user.java

6.创建映射文件 User.xml

7.创建测试类

占位符：

iBatis  #id#

myBatis  #{id}

1、创建web工程

2、导入jar包：

mybatis-3.2.2.jar

 

asm-3.3.1.jar

cglib-2.2.2.jar

commons-logging-1.1.1.jar

javassist-3.17.1-GA.jar

log4j-1.2.17.jar

slf4j-api-1.7.5.jar

slf4j-log4j12-1.7.5.jar

 

3、配置文件 sqlMapConfig.xml ：

事务：JDBC/MANAGED

数据源：UNPOOLED/POOLED/JNDI

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE configuration
 3 PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 4 "http://mybatis.org/dtd/mybatis-3-config.dtd">
 5 <configuration>
 6     <environments default="development">
 7         <environment id="development">
 8             <transactionManager type="JDBC"/>
 9             <dataSource type="POOLED">
10                 <property name="driver" value="com.mysql.jdbc.Driver"/>
11                 <property name="url" value="jdbc:mysql://localhost:3306/mybatisdb?characterEncoding=UTF-8"/>
12                 <property name="username" value="root"/>
13                 <property name="password" value="root"/>
14             </dataSource>
15         </environment>
16     </environments>
17 
18     <mappers>
19         <mapper resource="cn/itcast/mybatis/domain/User.xml"/>
20     </mappers>
21 </configuration>

4.创建数据库

创建mybatisdb数据库

创建User表

create table USER_C

(

   ID                   varchar(40) not null,

   NAME                 varchar(30),

   AGE                  int,

   ADDRESS              varchar(200),

   primary key (ID)

);

insert  into `user_c`(`id`,`name`,`age`,`address`)

values ('1','夏言',73,'桂州村'),

('2','严嵩',87,'分宜县城介桥村'),

('3','徐阶',80,'明松江府华亭县'),

('4','高拱',66,'河南省新郑市高老庄村'),

('5','张居正',58,'江陵');

5、映射文件 cn.itcast.mybatis.domain.User.xml ：

按 Ctrl+C 复制代码

按 Ctrl+C 复制代码

6、PO对象 User.java ：

 1 package cn.itcast.domain;
 2 
 3 public class User {
 4     private String id;
 5     private String name;
 6     private Integer age;
 7     private String address;
 8     public String getAddress() {
 9         return address;
10     }
11     public void setAddress(String address) {
12         this.address = address;
13     }
14     public String getId() {
15         return id;
16     }
17     public void setId(String id) {
18         this.id = id;
19     }
20     public String getName() {
21         return name;
22     }
23     public void setName(String name) {
24         this.name = name;
25     }
26     public Integer getAge() {
27         return age;
28     }
29     public void setAge(Integer age) {
30         this.age = age;
31     }
32     @Override
33     public String toString() {
34         return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
35     }
36     
37 }

7、测试类：

 1 package cn.itcast.test;
 2 
 3 import java.io.IOException;
 4 import java.io.InputStream;
 5 import java.util.List;
 6 import java.util.UUID;
 7 
 8 import org.apache.ibatis.io.Resources;
 9 import org.apache.ibatis.session.SqlSession;
10 import org.apache.ibatis.session.SqlSessionFactory;
11 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
12 import org.junit.Before;
13 import org.junit.Test;
14 
15 import cn.itcast.domain.User;
16 
17 public class TestMybatis {
18 
19     SqlSessionFactory sqlSessionFactory;
20     
21     @Before
22     public void initFactory() throws IOException
23     {
24         String resource = "sqlMapConfig.xml";
25 
26         InputStream inputStream = Resources.getResourceAsStream(resource);
27 
28         sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
29     }
30     
31     @Test
32     public  void testListAll()
33     {
34         SqlSession session=sqlSessionFactory.openSession();
35         List<User> users=session.selectList("cn.itcast.mybatis.listAll");
36         System.out.println(users.size());
37     }
38     @Test
39     public void testQueryOne()
40     {
41         SqlSession session=sqlSessionFactory.openSession();
42         User user=session.selectOne("cn.itcast.mybatis.getOne", 1);
43         System.out.println(user);
44     }
45     //事务需要程序员处理
46     @Test
47     public void testInsertOne()
48     {
49         User u=new User();
50         u.setId(UUID.randomUUID().toString());
51         u.setName("sbsbb");
52         u.setAge(18);
53         u.setAddress("china");
54         SqlSession session=sqlSessionFactory.openSession();
55         int count=session.insert("cn.itcast.mybatis.insertOne", u);
56         session.commit();
57         System.out.println(count);
58     }
59     
60     @Test
61     public void testUpdateOne()
62     {
63         SqlSession session=sqlSessionFactory.openSession();
64         User u=new User();
65         //u=session.selectOne("cn.itcast.mybatis.getOne", "2");
66         u.setId("2");
67         u.setName("clclclclclcfei");
68         u.setAge(100);
69         u.setAddress("USA");
70         int count=session.update("cn.itcast.mybatis.updateOne", u);
71         session.commit();
72         System.out.println(count);
73     }
74     @Test
75     public void testDeleteOne()
76     {
77         SqlSession session=sqlSessionFactory.openSession();
78         User u=new User();
79         u.setId("2");
80         int count=session.delete("cn.itcast.mybatis.deleteOne", u);
81         session.commit();
82         System.out.println(count);
83     }
84     
85     
86     
87 }