分享一下我老师大神的人工智能教程。零基础！通俗易懂！风趣幽默！还带黄段子！希望你也加入到我们人工智能的队伍中来！https://blog.csdn.net/jiangjunshow
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。
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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <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>http://maven.apache.org</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 + ", name=" + name + ", 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 id="getUser" 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 id="development"> <transactionManager type="JDBC" /> <dataSource type="POOLED"> <property name="driver" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://localhost:3306/mybatis" /> <property name="username" value="root" /> <property name="password" 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;public class Test { public static void main(String[] args) throws Exception { String resource = "conf.xml"; Reader reader = Resources.getResourceAsReader(resource); SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader); SqlSession session = sessionFactory.openSession(); String statement = "com.bird.mybatis.bean.userMapper.getUser"; Users user = session.selectOne(statement, 1); System.out.println(user); }}总体来说还是非常简单的。
分享一下我老师大神的人工智能教程。零基础！通俗易懂！风趣幽默！还带黄段子！希望你也加入到我们人工智能的队伍中来！https://blog.csdn.net/jiangjunshow