mybatis 入门（[尚硅谷]_张晓飞_Mybatis 学习笔记一）

创建数据库

-- ----------------------------
-- Table structure for `user`
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(20) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', 'Tom', '12');
INSERT INTO `user` VALUES ('2', 'Jack', '11');

下面是测试代码，测试目录如下：

 

添加log4j日志

log4j.rootLogger=DEBUG, Console

#Console
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n
log4j.logger.java.sql.ResultSet=INFO
log4j.logger.org.apache=INFO
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

与数据库对应的javabean

package com.hb.bean;

public class User {
	private int id;
	private String name;
	private int age;
    
	//get,set方法
	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;
	}
	
	public User(int id, String name, int age) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
	}
	
	public User() {
	}
	
	@Override
	public String toString() {
		return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
	}
	
	
}

配置mybatis的配置文件

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<?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>

	<settings>
		<!-- changes from the defaults for testing -->
		<setting name="cacheEnabled" value="false" />
		<setting name="useGeneratedKeys" value="true" />
		<setting name="defaultExecutorType" value="REUSE" />
	</settings>

	<typeAliases>
		<typeAlias alias="User" type="com.hb.bean.User" />
	</typeAliases>

	<environments default="development">
		<environment id="development">
			<transactionManager type="jdbc" />
			<dataSource type="POOLED">
				<!-- 
				<property name="driver" value="oracle.jdbc.driver.OracleDriver"/> 
				<property name="url" value="jdbc:oracle:thin:@192.168.56.201:1521:system"/> 
				-->
				<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="123456" />
			</dataSource>
		</environment>
	</environments>
<!-- 访问数据库的映射文件 -->
	<mappers>
		<mapper resource="com/hb/bean/userDao.xml" />
		<mapper class="com.hb.mapper.UserMapper" />
	</mappers>

</configuration>

一、访问xml文件操作数据库

<?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.hb.bean.userDao">
	<!-- 这里namespace必须是“包名 + xml文件名”，不然要运行的时候要报错 “is not known to the MapperRegistry” -->

	<insert id="insertUser" parameterType="com.hb.bean.User">
		insert into user(name, age) values(#{name}, #{age});
	</insert>

	<delete id="deleteUser" parameterType="int">
		delete from user where id=#{id}
	</delete>

	<update id="updateUser" parameterType="com.hb.bean.User">
		update user set name=#{name},age=#{age} where id=#{id}
	</update>

	<select id="selectUser" parameterType="int"
		resultType="com.hb.bean.User">
		select * from user where id=#{id}
	</select>

	<select id="selectAlluser" resultType="com.hb.bean.User">
		select * from user
	</select>

</mapper>

package com.hb.test1;

import java.io.InputStream;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;

import com.hb.bean.User;

public class Test1 {

	public static SqlSessionFactory sqlSessionFactory;
	public static SqlSession sqlSession;
	
	@Before
	public void init(){
		//"/"表示是在src根目录下
		String source = "config.xml";
		InputStream inputStream = Test1.class.getClassLoader().getResourceAsStream(source);
		
		try {
			sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
//			sqlSession = sqlSessionFactory.openSession();
			//是否自动提交，默认不是自动提交的
			sqlSession = sqlSessionFactory.openSession(true);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	@Test
	public void add(){
		
		String statment = "com.hb.bean.userDao.insertUser";
		User user = new User();
		user.setId(4);
		user.setAge(100);
		user.setName("father");
		sqlSession.insert(statment, user);
		//添加数据需要commit，默认是不commit
		sqlSession.commit();
		//关闭session
		sqlSession.close();
	}
	
	@Test
	public void selectById(){
		String statment = "com.hb.bean.userDao.selectUser";
		User user = sqlSession.selectOne(statment, "1");
		System.out.println(user);
	}
	
	@Test
	public void update(){
		String statment = "com.hb.bean.userDao.updateUser";
		User user = new User();
		user.setId(1);;
		user.setAge(100);
		user.setName("mather");
		sqlSession.update(statment, user);
		System.out.println(user);
	}
	
	@Test
	public void delete(){
		String statment = "com.hb.bean.userDao.deleteUser";
		sqlSession.delete(statment, 6);
		
		//添加数据需要commit，默认是不commit
		sqlSession.commit();
		//关闭session
		sqlSession.close();
	}
	
}

二、访问接口操作数据库

package com.hb.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import com.hb.bean.User;

public interface UserMapper {

	@Insert("insert into user(name, age) values(#{name}, #{age})")
	public int insertUser(User user);

	@Delete("delete from user where id=#{id}")
	public int deleteUserById(int id);
			
	@Update("update user set name=#{name},age=#{age} where id=#{id}")
	public int updateUser(User user);

	@Select("select * from user where id=#{id}")
	public User getUserById(int id);

	@Select("select * from user")
	public List<User> getAllUser();

}

package com.hb.test1;

import java.io.InputStream;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;

import com.hb.bean.User;

public class AnnotationTest1 {

	public static SqlSessionFactory sqlSessionFactory;
	public static SqlSession sqlSession;
	
	@Before
	public void init(){
		//"/"表示是在src根目录下
		String source = "config.xml";
		InputStream inputStream = AnnotationTest1.class.getClassLoader().getResourceAsStream(source);
		
		try {
			sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
//			sqlSession = sqlSessionFactory.openSession();
			//是否自动提交，默认不是自动提交的
			sqlSession = sqlSessionFactory.openSession(true);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	@Test
	public void add(){
		String statment = "com.hb.mapper.UserMapper.insertUser";
		User user = new User();
		user.setId(4);
		user.setAge(100);
		user.setName("father");
		sqlSession.insert(statment, user);
		//添加数据需要commit，默认是不commit
		sqlSession.commit();
		//关闭session
		sqlSession.close();
	}
	
	@Test
	public void selectById(){
		String statment = "com.hb.mapper.UserMapper.selectUser";
		User user = sqlSession.selectOne(statment, "1");
		System.out.println(user);
	}
	
	@Test
	public void update(){
		String statment = "com.hb.mapper.UserMapper.updateUser";
		User user = new User();
		user.setId(1);;
		user.setAge(100);
		user.setName("mather");
		sqlSession.update(statment, user);
		System.out.println(user);
	}
	
	@Test
	public void delete(){
		String statment = "com.hb.mapper.UserMapper.deleteUser";
		sqlSession.delete(statment, 6);
		
		//添加数据需要commit，默认是不commit
		sqlSession.commit();
		//关闭session
		sqlSession.close();
	}
	
}