使用MyBatis框架进行数据库的增删改查操作

 1.配置文件

db.properties

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

mybatis-config.xml
<?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">
<!-- XML 配置文件包含对 MyBatis 系统的核心设置 -->
<configuration>
<properties resource="db.properties"/>
<!-- 指定 MyBatis 所用日志的具体实现 -->
<settings>
<setting name="logImpl" value="LOG4J"/>
</settings>
<!-- 设置别名 -->
<typeAliases>
<typeAlias alias="user" type="com.bean.User"/>
</typeAliases>

<environments default="mysql">
<!-- 环境配置，即连接的数据库。 -->
<environment id="mysql">
<!-- 指定事务管理类型，type="JDBC"指直接简单使用了JDBC的提交和回滚设置 -->
<transactionManager type="JDBC"/>
<!-- dataSource指数据源配置，POOLED是JDBC连接对象的数据源连接池的实现。 -->
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<!-- mappers告诉了MyBatis去哪里找持久化类的映射文件 -->
<mappers>
<mapper resource="com/mapper/UserMapper.xml"/>
</mappers>
</configuration>

UserMapper.xml
<?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">
<!-- namespace指用户自定义的命名空间。 -->
<mapper namespace="com.mapper.UserMapper">
<!-- insert操作，parameterType="user"表示该插入语句需要一个user对象作为参数，useGeneratedKeys="true"表示使用自动增长的主键 -->
<insert id="saveUser" parameterType="user" useGeneratedKeys="true" keyProperty="id">
INSERT INTO TB_USER(name,sex,age) VALUES(#{name},#{sex},#{age})
</insert>

<!-- select操作,parameterType="int"表示该查询语句需要一个int类型的参数,resultType="user"表示返回的是一个user对象 -->
<select id="selectUser" parameterType="int" resultType="user">
SELECT * FROM TB_USER WHERE id = #{id}
</select>

<!-- update操作 ,parameterType="user"表示该更新语句需要一个user对象作为参数-->
<update id="modifyUser" parameterType="user">
UPDATE TB_USER SET name = #{name},sex = #{sex},age = #{age} WHERE id = #{id}
</update>

<!-- delete操作 parameterType="int"表示该查询语句需要一个int类型的参数-->
<delete id="removeUser" parameterType="int">
DELETE FROM TB_USER WHERE id = #{id}
</delete>
</mapper>

User.java
package com.bean;

import java.io.Serializable;

public class User implements Serializable {
private Integer id;
private String name;
private String sex;
private Integer age;
public User() {
super();
// TODO Auto-generated constructor stub
}
public User(String name, String sex, Integer age) {
super();
this.name = name;
this.sex = sex;
this.age = age;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
// TODO Auto-generated method stub
return "User [id=" + id + ", name=" + name + ", sex=" + sex + ", age=" + age + "]";
}

}


SqlSessionFactory.java
package com.factory;

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 FKSqlSessionFactory {

private static SqlSessionFactory sqlSessionFactory = null;
// 初始化创建SqlSessionFactory对象
static{
try {
// 读取mybatis-config.xml文件
InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
} catch (Exception e) {
e.printStackTrace();
}
}

// 获取SqlSession对象的静态方法
public static SqlSession getSqlSession(){
return sqlSessionFactory.openSession();
}

// 获取SqlSessionFactory的静态方法
public static SqlSessionFactory getSqlSessionFactory() {
return sqlSessionFactory;
}

}


InsertTest.java
package com.test;

import org.apache.ibatis.session.SqlSession;

import com.bean.User;
import com.factory.FKSqlSessionFactory;

public class InsertTest {

public static void main(String[] args) {
// TODO Auto-generated method stub
// 获得Session实例
SqlSession session=FKSqlSessionFactory.getSqlSession();
// 创建User对象
User user = new User("Yangxu", "男", 22);
// 插入数据
session.insert("com.mapper.UserMapper.saveUser", user);
// 提交事务
session.commit();
session.close();
}

}


DeleteTest.java
package com.test;

import org.apache.ibatis.session.SqlSession;
import com.factory.FKSqlSessionFactory;

public class DeleteTest {
public static void main(String[] args) throws Exception {
SqlSession session = FKSqlSessionFactory.getSqlSession();
// 删除id为1的User对象
session.delete("com.mapper.UserMapper.removeUser",4);
// 提交事务
session.commit();
session.close();
}
}


UpadeTest.java
package com.test;

import org.apache.ibatis.session.SqlSession;
import com.bean.User;
import com.factory.FKSqlSessionFactory;

public class UpadeTest {
public static void main(String[] args) throws Exception {
SqlSession session = FKSqlSessionFactory.getSqlSession();
// 根据id查询User对象
User user = session.selectOne("com.mapper.UserMapper.selectUser",2);
// 修改User对象的属性值
user.setName("tom");
user.setAge(25);
// 修改User对象
session.update("com.mapper.UserMapper.modifyUser", user);
// 提交事务
session.commit();
session.close();
}
}


SelectTest.java
package com.test;

import org.apache.ibatis.session.SqlSession;
import com.bean.*;
import com.factory.FKSqlSessionFactory;

public class SelectTest {
public static void main(String[] args) throws Exception {
// 获得Session实例
SqlSession session = FKSqlSessionFactory.getSqlSession();
// 根据id查询User对象
User user = session.selectOne("com.mapper.UserMapper.selectUser",2);
System.out.println(user);
// 提交事务
session.commit();
session.close();
}

}


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