秒杀系统(二)——基础知识回顾MyBatis之mapper代理方式写mybatis的应用程序
目录
1、环境搭建
2、添加实体
public class Person {
private int id;
private String name; // 姓名
private String sex; // 性别
private Date birthday; // 生日
private String address; // 地址
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 String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "Person [id=" + id + ", name=" + name + ", sex=" + sex + ", birthday=" + birthday + ", address="
+ address + "]";
}
}
3、添加映射文件Person.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">
<mapper namespace="com.albertyy.mapper.PersonMapper">
<sql id="consutomsql" >
<if test="customPerson != null">
<if test="customPerson.name!=null and customPerson.name!=''">
and name = "${customPerson.name}"
</if>
<if test="customPerson.birthday!=null and customPerson.birthday!='' ">
and birthday = "${customPerson.birthday}"
</if>
</if>
</sql>
<select id="querypersonbyvo" parameterType="personVo" resultType="person">
select * from Person
<where>
<include refid="consutomsql"></include>
</where>
</select>
<select id="querypersonbyid" parameterType="int" resultType="person">
select id,name,sex,birthday,address from Person where id = #{value}
</select>
<select id="querypersonbyname" parameterType="java.lang.String" resultType="person">
select id,name,sex,birthday,address from Person where name like "%${value}%"
</select>
<insert id="inserperson" parameterType="person">
<selectKey keyProperty="id" order="AFTER" resultType="java.lang.Integer">
SELECT LAST_INSERT_ID()
</selectKey>
insert into Person(name,sex,address,birthday) value(#{name},#{sex},#{address},#{birthday})
</insert>
<delete id="deletepersonbyid" parameterType="int">
delete from Person where id = #{id}
</delete>
<delete id="updatepersonbyid" parameterType="person">
update Person set name=#{name},sex=#{sex},birthday=#{birthday},address=#{address} where id = #{id}
</delete>
</mapper>4、添加接口
public interface PersonMapper {
public Person querypersonbyid(int id);
public List<Person> querypersonbyname(String name);
public void inserperson(Person person);
public void deletepersonbyid(int id);
public void updatepersonbyid(Person person);
public List<Person> querypersonbyvo(PersonVo personVo);
}
5、添加SqlMappingConfig.xml文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 加载属性文件 -->
<properties resource="jdbc.properties">
<!--properties中还可以配置一些属性名和属性值 -->
<!-- <property name="jdbc.driver" value=""/> -->
</properties>
<typeAliases>
<!-- 别名定义 -->
<typeAlias type="com.albertyy.entity.Person" alias="Person" />
<typeAlias type="com.albertyy.vo.PersonVo" alias="PersonVo" />
</typeAliases>
<environments default="development">
<environment id="development">
<!-- 使用jdbc事务管理，事务控制由mybatis -->
<transactionManager type="JDBC" />
<!-- 数据库连接池，由mybatis管理 -->
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</dataSource>
</environment>
</environments>
<!-- 加载 映射文件 -->
<mappers>
<!--通过resource方法一次加载一个映射文件 -->
<!--注意这里的路径和xml文件 -->
<mapper resource="Person.xml" />
</mappers>
</configuration>
6、编写测试类进行测试
public class TestMybatis {
// 获得工厂
public SqlSessionFactory getFactory() {
String filepath = "SqlMappingConfig.xml";
SqlSessionFactory sqlSessionFactory = null;
try {
InputStream in = Resources.getResourceAsStream(filepath);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
} catch (IOException e) {
e.printStackTrace();
}
return sqlSessionFactory;
}
// 插入
@Test
public void testinsert() {
// 创建Person实体
Person person = new Person();
person.setName("藏小组");
person.setSex("男");
String date = "2019-01-12";
// 创建sdf对象，指定日期格式类型
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
// sdf将字符串转化成java.util.Date
java.util.Date parse = null;
try {
parse = sdf.parse(date);
} catch (ParseException e) {
e.printStackTrace();
}
// java.util.Date转换成long
long time = parse.getTime();
// 将long转换为java.sql.Date
Date date2 = new Date(time);
person.setBirthday(date2);
person.setAddress("河南郑州");
// 得到工厂
SqlSessionFactory sqlSessionFactory = this.getFactory();
SqlSession sqlSession = sqlSessionFactory.openSession();
// 插入数据
PersonMapper personMapper=sqlSession.getMapper(PersonMapper.class);
personMapper.inserperson(person);
System.out.println(person.getId());
sqlSession.commit();
sqlSession.close();
}
// 通过Id查询
@Test
public void getByIdPerson() {
// 得到工厂
SqlSessionFactory sqlSessionFactory = this.getFactory();
SqlSession sqlSession = sqlSessionFactory.openSession();
Person person = sqlSession.getMapper(PersonMapper.class).querypersonbyid(3);
System.out.println(person);
sqlSession.commit();
sqlSession.close();
}
// 通过名字模糊查询
@Test
public void getByNameList() {
// 得到工厂
SqlSessionFactory sqlSessionFactory = this.getFactory();
SqlSession sqlSession = sqlSessionFactory.openSession();
List<Person> persons = sqlSession.getMapper(PersonMapper.class).querypersonbyname("小");
for (Person person2 : persons) {
System.out.println(person2);
}
sqlSession.commit();
sqlSession.close();
}
// 通过Id进行删除
@Test
public void deleteById() {
// 得到工厂
SqlSessionFactory sqlSessionFactory = this.getFactory();
SqlSession sqlSession = sqlSessionFactory.openSession();
sqlSession.getMapper(PersonMapper.class).deletepersonbyid(6);
sqlSession.commit();
sqlSession.close();
}
// 更新
@Test
public void testupdatePerson() throws IOException {
SqlSessionFactory sqlSessionFactory = this.getFactory();
SqlSession sqlsession = sqlSessionFactory.openSession();
Person person = new Person();
person.setId(2);
person.setName("AlbertYang666");
person.setAddress("河南郑州");
person.setSex("男");
String date = "2019-01-30";
// 创建sdf对象，指定日期格式类型
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
// sdf将字符串转化成java.util.Date
java.util.Date parse = null;
try {
parse = sdf.parse(date);
} catch (ParseException e) {
e.printStackTrace();
}
// java.util.Date转换成long
long time = parse.getTime();
// 将long转换为java.sql.Date
Date date2 = new Date(time);
person.setBirthday(date2);
sqlsession.getMapper(PersonMapper.class).updatepersonbyid(person);
sqlsession.commit();
sqlsession.close();
}
}
源代码：
链接: https://pan.baidu.com/s/1n4Swp3uvkMGTUcx-i-6sNQ 提取码: axux