Maven mybatis的框架搭建

Posted 2020-10-06 Litter1996

小编用的是 IDEA 2017.2  maven搭建环境

 

1.pom.xml

 1 <!--mybatis需要的依赖-->
 2     <dependency>
 3       <groupId>org.mybatis</groupId>
 4       <artifactId>mybatis</artifactId>
 5       <version>3.4.1</version>
 6     </dependency>
 7 
 8     <!--mysql需要的依赖-->
 9     <dependency>
10       <groupId>mysql</groupId>
11       <artifactId>mysql-connector-java</artifactId>
12       <version>5.1.38</version>
13     </dependency>
14 
15     <!-- 日志文件管理包 -->
16     <dependency>
17       <groupId>log4j</groupId>
18       <artifactId>log4j</artifactId>
19       <version>1.2.17</version>
20     </dependency>
21     <dependency>
22       <groupId>org.slf4j</groupId>
23       <artifactId>slf4j-api</artifactId>
24       <version>1.7.12</version>
25     </dependency>
26     <dependency>
27       <groupId>org.slf4j</groupId>
28       <artifactId>slf4j-log4j12</artifactId>
29       <version>1.7.12</version>
30     </dependency>

pom.xml

2.Bean

Employee

 1 package com.mozi.bean;
 2 
 3 public class Employee {
 4 
 5     private Integer id;
 6     private String lastName;
 7     private  String email;
 8     private String gender;
 9 
10     public  Employee(){}
11 
12     @Override
13     public String toString() {
14         return "Employee{" +
15                 "id=" + id +
16                 ", lastName=‘" + lastName + ‘\‘‘ +
17                 ", email=‘" + email + ‘\‘‘ +
18                 ", gender=‘" + gender + ‘\‘‘ +
19                 ‘}‘;
20     }
21 
22     public Employee(Integer id, String lastName, String email, String gender) {
23         this.id = id;
24         this.lastName = lastName;
25         this.email = email;
26         this.gender = gender;
27     }
28 
29     public Integer getId() {
30 
31         return id;
32     }
33 
34     public void setId(Integer id) {
35         this.id = id;
36     }
37 
38     public String getLastName() {
39         return lastName;
40     }
41 
42     public void setLastName(String lastName) {
43         this.lastName = lastName;
44     }
45 
46     public String getEmail() {
47         return email;
48     }
49 
50     public void setEmail(String email) {
51         this.email = email;
52     }
53 
54     public String getGender() {
55         return gender;
56     }
57 
58     public void setGender(String gender) {
59         this.gender = gender;
60     }
61 }

3.Bean的映射文件

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE mapper
 3         PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 4         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 5 
 6 <!--
 7    namespace:名称空间
 8    id:唯一标识
 9    resultType:返回值类型
10    #{id} 从传递过来的参数中取出id值
11 
12 -->
13 <mapper namespace="com.mozi.bean.EmployeeMapper">
14     <select id="selectEmp" resultType="com.mozi.bean.Employee">
15         select id,last_name lastName,email,gender from table_mybatis where id = #{id}
16     </select>
17 </mapper>

EmployeeMapper

4.全局映射文件

 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/mybtis"/>
12                 <property name="username" value="root"/>
13                 <property name="password" value=""/>
14             </dataSource>
15         </environment>
16     </environments>
17     <mappers>
18         <mapper resource="EmployeeMapper.xml"/>
19     </mappers>
20 </configuration>

mybatis.xml

5.测试类

 1 package com.mozi.bean;
 2 
 3 import org.apache.ibatis.io.ResolverUtil;
 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 
 9 import java.io.IOException;
10 import java.io.InputStream;
11 
12 public class mybatisTest {
13     public static void main(String args[]) throws IOException {
14         mybatisTest mybatisTest = new mybatisTest();
15         mybatisTest.Test();
16     }
17     /**
18      * 1、根据xml配置文件（全局配置文件）创建一个SqlSessionFactory对象
19      * 2、sql映射文件，配置了每一个sql，以及sql的封装规则等
20      * 3、将sql映射文件注册在全局配置文件中
21      *     (1)、根据全局配置文件得到sqlSessionFactory
22      *     (2)、使用sqlFactory工厂，获取sqlSession对象使用他来执行增删改查
23      *          一个sqlSession就是代表和数据库的一次会话，用完关闭
24      *     (3)、使用sql的唯一标志来告诉Mybatis执行哪个sql、sql保存在映射文件中
25      * @throws IOException
26      */
27     public void Test() throws IOException {
28         String resource = "mybatis.xml";
29         InputStream inputStream = Resources.getResourceAsStream(resource);
30         SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
31 
32         //2.获取sqlSession实例，能直接执行已经映射的sql语句
33         SqlSession openSession = sqlSessionFactory.openSession();
34         try {
35             Employee employee = openSession.selectOne("com.mozi.bean.EmployeeMapper.selectEmp", 1);
36             System.out.println(employee);
37         }finally {
38             openSession.close();
39         }
40         }
41 }

MybatisTest

6.log4j

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
 3 
 4 <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
 5 
 6     <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
 7         <param name="Encoding" value="UTF-8" />
 8         <layout class="org.apache.log4j.PatternLayout">
 9             <param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS} %m  (%F:%L) \n" />
10         </layout>
11     </appender>
12     <logger name="java.sql">
13         <level value="debug" />
14     </logger>
15     <logger name="org.apache.ibatis">
16         <level value="info" />
17     </logger>
18     <root>
19         <level value="debug" />
20         <appender-ref ref="STDOUT" />
21     </root>
22 </log4j:configuration>

log4j.xml