使用IDEA Maven搭建mybatis环境

1、先创建一个项目，在pom.xml下增加如下jar配置

        
        <dependency>
            <groupId>org.mybatisgroupId>
            <artifactId>mybatisartifactId>
            <version>3.3.0version>
        dependency>
        
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <version>5.1.29version>
        dependency>
        
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>4.11version>
            <scope>testscope>
        dependency>
        
        <dependency>
            <groupId>log4jgroupId>
            <artifactId>log4jartifactId>
            <version>1.2.17version>
        dependency>
        <dependency>
            <groupId>org.slf4jgroupId>
            <artifactId>slf4j-apiartifactId>
            <version>1.7.12version>
        dependency>
        <dependency>
            <groupId>org.slf4jgroupId>
            <artifactId>slf4j-log4j12artifactId>
            <version>1.7.12version>
        dependency>

2、在src/java下新建一个包com.hgc.pojo,然后在该包下创建一个java文件，文件名User，增加代码如下

package com.hgc.pojo;
public class User {
    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;
    }
}

3、在src/main/resources下创建一个文件夹mapper，在该文件夹下创建一个UserMapper.xml文件,代码如下

<mapper namespace="com.hgc.pojo.User">
    <select id="findById" parameterType="int" resultType="com.hgc.pojo.User">
        SELECT * FROM User WHERE id=#{id}
    select>
mapper>

4、在src/main/resources下创建mysql.properties文件,代码如下

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://192.168.9.248:3306/mybatis
jdbc.username=root
jdbc.password=Mysql@123456

5、在src/main/resources下创建mybatis-config.xml文件,代码如下

<configuration>
    <properties resource="mysql.properties"/>
    <settings>
        
        <setting name="lazyLoadingEnabled" value="true"/>
        
        <setting name="aggressiveLazyLoading" value="false"/>
    settings>
    <typeAliases>
        
        <typeAlias type="com.hgc.pojo.User" alias="User"/>
    typeAliases>
    
    <environments default="development">
        <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>
    
    <mappers>
        <mapper resource="mapper/UserMapper.xml"/>
    mappers>

configuration>

6、创建一个数据库mybatis，建立一个表User,代码如下

CREATE TABLE `User` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
INSERT INTO `User` VALUES (1, 'test', 18);
INSERT INTO `User` VALUES (2, '张三', 25);

7、在src/main/java下创建一个包com.hgc.test，在该包下创建UserTest.java文件，代码如下

package test;

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 com.hgc.pojoUser;

import java.io.IOException;
import java.io.Reader;

/**
 * Created by 47500 on 2017/8/28.
 */
public class UserTest {
    public static void main(String[] args) {
        String resource ="mybatis-config.xml";
        Reader reader = null;
        try {
            reader = Resources.getResourceAsReader(resource);
            SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
            SqlSession session = sqlSessionFactory.openSession();
            User user = session.selectOne("findById",2);
            session.commit();
            System.out.println(user.getName());
        }catch (IOException e){
            e.printStackTrace();
        }


    }
}

8、最后在测试是否有数据输出