mybatis 入门（[尚硅谷]_张晓飞_Mybatis 学习笔记一）

285572001

　　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

<?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();
}
}