Eclipse搭建Mybatis框架

什么是mybatis？

mybatis是一个优秀的基于java的持久层框架，它内部封装了jdbc，使开发者只需要关注sql语句本身，而不需要花费精力去处理加载驱动、创建连接、创建statement等繁杂的过程。

mybatis通过xml或注解的方式将要执行的各种statement配置起来，并通过java对象和statement中sql的动态参数进行映射生成最终执行的sql语句，最后由mybatis框架执行sql并将结果映射为java对象并返回。

搭建框架：

一、准备工作

eclipse集成开发软件，配置maven，jdk，tomcat（具体的不详细介绍）

二、创建maven project

点击next这一步的话不建议进行操作

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输入集团Id，分组Id。

二、配置pom.xml

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  <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>TestSSM</groupId>
<artifactId>TestSSM</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>TestSSM Maven Webapp</name>
<url>http://maven.apache.org</url>
<build>
<finalName>TestSSM</finalName>
</build>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
   <groupId>org.junit.platform</groupId>
   <artifactId>junit-platform-launcher</artifactId>
   <version> 1.1.0 </version>
   <scope>test</scope>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.6</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
</dependencies>
</project>

----------------------------------------------------------------------------------------------------------------------------

三、创建实体类User.java 和UserMapper接口

----------------------------------------------------------------------------------------------------------------------------

package pojo;

public class User {
private String username;//用户名
private String password;//密码

public User() {
}
public User(String username, String password) {
   this.username = username;
   this.password = password;
}
public String getUsername() {
   return username;
}
public void setUsername(String username) {
   this.username = username;
}
public String getPassword() {
   return password;
}
public void setPassword(String password) {
   this.password = password;
}
@Override
public String toString() {
   return "User [username=" + username + ", password=" + password + "]";
}
}

----------------------------------------------------------------------------------------------------------------------------

package dao;

import org.apache.ibatis.annotations.Param;

import pojo.User;

public interface UserMapper {
User selectById(@Param("id") int id);
}

----------------------------------------------------------------------------------------------------------------------------

四、配置mybatis-config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>
   
   <environments default="development">
   <environment id="development">

<transactionManager type="JDBC" />




<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/test1?characterEncoding=utf-8" />
<property name="username" value="root" />
<property name="password" value="root" />
</dataSource>
</environment>
   </environments>
    <mappers>
<mapper resource="dao/UserMapper.xml"/>
</mappers>
</configuration>

----------------------------------------------------------------------------------------------------------------------------
5、创建UserMapper.xml文件进行测试

----------------------------------------------------------------------------------------------------------------------------

<?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="dao.UserMapper">

<select id="selectById" resultType="pojo.User">
select username,password from user where id=#{id}
</select>
</mapper>

----------------------------------------------------------------------------------------------------------------------------

6、进行测试，编写TestUser

----------------------------------------------------------------------------------------------------------------------------

package pojo;

import java.io.IOException;
import java.io.InputStream;

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

import pojo.User;

public class TestUser {
   @Test
   public void testuser() {
       String resource = "mybatis-config.xml";

InputStream inputStream = null;
       try {
           inputStream = Resources.getResourceAsStream(resource);
       } catch (IOException e) {
           // TODO Auto-generated catch bloc
           e.printStackTrace();
       }
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession session = factory.openSession();
User user = session.selectOne("dao.UserMapper.selectById", 1);
System.out.println(user);
   }
}
----------------------------------------------------------------------------------------------------------------------------

7、数据库

注：目录结构，有时候文件位置错了的话需要大家去调整

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Eclipse搭建Mybatis框架

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