MyBatis初探之环境的配置

很早之前就想学习mybatis,据说很多公司都使用这个框架。以前我都使用老掉牙的DBCP，Hibernate感觉太大，现在来学学这个中性的框架。

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首先是环境的配置，我使用maven创建项目，pom.xml文件如下

<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 ">
 <modelVersion>4.0.0</modelVersion>

<groupId>com.bird</groupId>
 <artifactId>concursey</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <packaging>jar</packaging>

<name>concursey</name>
 <url></url>

<properties>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 </properties>

<dependencies>
  <dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
   <version>3.8.1</version>
   <scope>test</scope>
  </dependency>

<dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis</artifactId>
   <version>3.2.7</version>
  </dependency>
 
  <dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <version>5.1.32</version>
  </dependency>
 </dependencies>
</project>

还得创建一个数据库和对应的一张表做示范，这里就不写了，直接上对应的JavaBean

package com.bird.mybatis.bean;

public class Users {

private int id;
 private String name;
 private int age;

public int getId() {
  return id;
 }

public void setId(int id) {
  this.id = id;
 }

public String getName() {
  return name;
 }

public void setName(String name) {
  this.name = name;
 }

public int getAge() {
  return age;
 }

public void setAge(int age) {
  this.age = age;
 }

@Override
 public String toString() {
  return "Users [id=" + id + ",, age=" + age + "]";
 }

}

然后要给对应的JavaBean创建对应的mapper.xml文件，内容如下

<?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="com.bird.mybatis.bean.userMapper">
 <!--根据ID获取对应的值  -->
 <select parameterType="int" resultType="com.bird.mybatis.bean.Users">
  select * from users where id = #{id}
 </select>
</mapper>

当然还有mybatis的全局文件，conf.xml内容如下

<?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>
<!-- development:开发模式    work:工作模式 -->
 <environments default="development">
  <environment>
   <transactionManager type="JDBC" />
   <dataSource type="POOLED">
    <property value="com.mysql.jdbc.Driver" />
    <property value="jdbc:mysql://localhost:3306/mybatis" />
    <property value="root" />
    <property value="root" />
   </dataSource>
  </environment>
 </environments>
 
 <mappers>
  <mapper resource="com/bird/mybatis/bean/userMapper.xml" />
 </mappers>

</configuration>

最后是测试代码

package com.bird.mybatis.bean;

import java.io.Reader;

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