SSM11.1【Mybatis：Mybatis简介、快速入门、映射文件概述】

简介

 

 

 

 

 

 

 

 快速入门

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0"
 3          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5     <modelVersion>4.0.0</modelVersion>
 6 
 7     <groupId>com.haifei</groupId>
 8     <artifactId>SSM11_mybatis_quick</artifactId>
 9     <version>1.0-SNAPSHOT</version>
10     <packaging>war</packaging>
11 
12 
13     <dependencies>
14         <dependency>
15             <groupId>mysql</groupId>
16             <artifactId>mysql-connector-java</artifactId>
17             <version>5.1.32</version>
18         </dependency>
19         <dependency>
20             <groupId>org.mybatis</groupId>
21             <artifactId>mybatis</artifactId>
22             <version>3.4.6</version>
23         </dependency>
24         <dependency>
25             <groupId>junit</groupId>
26             <artifactId>junit</artifactId>
27             <version>4.12</version>
28         </dependency>
29         <dependency>
30             <groupId>log4j</groupId>
31             <artifactId>log4j</artifactId>
32             <version>1.2.17</version>
33         </dependency>
34     </dependencies>
35 
36 
37     <build>
38         <plugins>
39             <!--jdk编译插件-->
40             <plugin>
41                 <groupId>org.apache.maven.plugins</groupId>
42                 <artifactId>maven-compiler-plugin</artifactId>
43                 <version>3.1</version>
44                 <configuration>
45                     <target>1.8</target>
46                     <source>1.8</source>
47                     <encoding>UTF-8</encoding>
48                 </configuration>
49             </plugin>
50         </plugins>
51     </build>
52 
53 
54 </project>

 

 1 package com.haifei.domain;
 2 
 3 public class User {
 4 
 5     private int id;
 6     private String username;
 7     private String password;
 8 
 9     @Override
10     public String toString() {
11         return "User{" +
12                 "id=" + id +
13                 ", username='" + username + '\'' +
14                 ", password='" + password + '\'' +
15                 '}';
16     }
17 
18     public int getId() {
19         return id;
20     }
21 
22     public void setId(int id) {
23         this.id = id;
24     }
25 
26     public String getUsername() {
27         return username;
28     }
29 
30     public void setUsername(String username) {
31         this.username = username;
32     }
33 
34     public String getPassword() {
35         return password;
36     }
37 
38     public void setPassword(String password) {
39         this.password = password;
40     }
41 }

 

 

 

 1 UserMapper.xml
 2 
 3 <?xml version="1.0" encoding="UTF-8" ?>
 4 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 5 
 6 <mapper namespace="userMapper">
 7 
 8     <select id="findAll" resultType="com.haifei.domain.User">
 9         select * from user
10     </select>
11 
12 </mapper>

 

sqlMapConfig.xml


<?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>

    <!--通过properties标签加载外部properties文件-->
    <properties resource="jdbc.properties"></properties>

    <environments default="development">
        <!--配置数据源环境-->
        <environment id="development">
            <transactionManager type="JDBC"></transactionManager>
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>

    <!--加载映射文件-->
    <mappers>
        <mapper resource="com/haifei/mapper/UserMapper.xml"></mapper>
    </mappers>

</configuration>

 

 

 1 package com.haifei.test;
 2 
 3 import com.haifei.domain.User;
 4 import org.apache.ibatis.io.Resources;
 5 import org.apache.ibatis.session.SqlSession;
 6 import org.apache.ibatis.session.SqlSessionFactory;
 7 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 8 import org.junit.Test;
 9 
10 import java.io.IOException;
11 import java.io.InputStream;
12 import java.util.List;
13 
14 public class MybatisTest {
15 
16     /**
17      * Mybatis快速入门测试
18      * @throws IOException
19      */
20     @Test
21     public void test1() throws IOException {
22         //加载Mybatis核心配置文件
23         InputStream resourceAsStream = Resources.getResourceAsStream("sqlMapConfig.xml");
24         //获取session工厂对象
25         SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
26         //获取session会话对象
27         SqlSession sqlSession = sqlSessionFactory.openSession();
28         //执行操作(参数：namespace+.+id)
29         List<User> userList = sqlSession.selectList("userMapper.findAll");
30         //打印结果
31         System.out.println(userList); //[User{id=1, username='zhangsan', password='123'}, User{id=2, username='lisi', password='345'}, User{id=3, username='wangwu', password='789'}]
32         //释放资源
33         sqlSession.close();
34     }
35 
36 }

 

Mybatis的映射文件概述

posted @ 2021-07-22 17:43  yub4by  阅读(56)  评论(0)    收藏  举报