MyBatis3实现

1. MyBatis3实现

    官方网站：http://blog.mybatis.org/

1. 创建数据库和表

创建db_mybatis数据库
CREATE DATABASE db_mybatis DEFAULT CHARACTER SET utf8;

创建t_student数据表
create table t_student(
id int(11) NOT NULL AUTO_INCREMENT,
name varchar(20) DEFAULT NULL,
age int(11) DEFAULT NULL,
PRIMARY KEY(id)
)ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;

插入数据
insert into t_student(id, name, age) values(1, '张三', 10),(2, '李四', 20);

2. 导入jar包

新建项目MyBatisPro01

引入mysql
新建Folder，导入mysql所用的jar包，右键 --> Build Path --> Add To Build Path
mysql-connector-java-3.1.12-bin.jar

引入mybatis
新建Folder，导入mybatis所用的jar包，右键 --> Build Path --> Add To Build Path
mybatis-3.2.8.jar

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/db_mybatis
jdbc.username=root
jdbc.password=root

<?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>
    <properties resource="jdbc.properties"/>
    <typeAliases>
        <typeAlias alias="Student" type="com.andrew.model.Student"/>
    </typeAliases>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driverClassName}" />
                <property name="url" value="${jdbc.url}" />
                <property name="username" value="${jdbc.username}" />
                <property name="password" value="${jdbc.password}" />
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/andrew/mappers/StudentMapper.xml" />
    </mappers>
</configuration>

package com.andrew.model;
public class Student {
    private Integer id;
    private String name;
    private Integer age;
    public Student() {
        super();
    }
    public Student(String name, Integer age) {
        super();
        this.name = name;
        this.age = age;
    }
    public Student(Integer id, String name, Integer age) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
    }
    // getter and setter ...
}

package com.andrew.mappers;
import com.andrew.model.Student;
public interface StudentMapper {
    public int add(Student student);
}

<?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.andrew.mappers.StudentMapper">
    <insert id="add" parameterType="Student">
        insert into t_student values(null, #{name}, #{age})
    </insert>
</mapper>

package com.andrew.util;
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;
public class SqlSessionFactoryUtil {
    private static SqlSessionFactory sqlSessionFactory;
    public static SqlSessionFactory getSqlSessionFactory() {
        if(sqlSessionFactory==null){
            InputStream inputStream=null;
            try {
    inputStream=Resources.getResourceAsStream("mybatis-config.xml");
    sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
            } catch(Exception e) {
                e.printStackTrace();
            }
        }
        return sqlSessionFactory;
    }
    public static SqlSession openSession() {
        return getSqlSessionFactory().openSession();
    }
}

package com.andrew.service;
import org.apache.ibatis.session.SqlSession;
import com.andrew.mappers.StudentMapper;
import com.andrew.model.Student;
import com.andrew.util.SqlSessionFactoryUtil;
public class StudentTest {
    public static void main(String[] args) {
        SqlSession sqlSession=SqlSessionFactoryUtil.openSession();
        StudentMapper studentMapper=sqlSession.getMapper(StudentMapper.class);
        Student student = new Student("王五", 21);
        int result = studentMapper.add(student);
        sqlSession.commit();
        if (result > 0) {
            System.out.println("添加成功！");
        }
    }
}

运行结果：
添加成功！

2. 引入log4j

新建Folder，导入log4j所用的jar包，右键 --> Build Path --> Add To Build Path
mybatis-3.2.8.jar

log4j.rootLogger=info,appender1,appender2
log4j.appender.appender1=org.apache.log4j.ConsoleAppender 
log4j.appender.appender2=org.apache.log4j.FileAppender 
log4j.appender.appender2.File=E:/mybatis-log4j-file.txt
log4j.appender.appender1.layout=org.apache.log4j.TTCCLayout
log4j.appender.appender2.layout=org.apache.log4j.TTCCLayout

package com.andrew.service;
import org.apache.ibatis.session.SqlSession;
import org.apache.log4j.Logger;
import com.andrew.mappers.StudentMapper;
import com.andrew.model.Student;
import com.andrew.util.SqlSessionFactoryUtil;
public class StudentTest {
    private static Logger logger = Logger.getLogger("StudentTest");
    public static void main(String[] args) {
        SqlSession sqlSession=SqlSessionFactoryUtil.openSession();
        StudentMapper studentMapper=sqlSession.getMapper(StudentMapper.class);
        Student student=new Student("赵六4", 23);
        int result = studentMapper.add(student);
        sqlSession.commit();
        if (result > 0) {
            logger.info("添加成功！！！");
        }
    }
}
运行结果：
[main] INFO com.andrew.service.StudentTest - 添加成功！！！