MyBatis convention based deletions and dynamics change search mode
Project structure
1.
CREATE TABLE empinfo (
eid INT (10) PRIMARY KEY,
name VARCHAR (20),
age INT(10),
sex VARCHAR(5)
);
2.
<?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>
<!--通过 environments的 default值和environments的id值来指定MyBatis运行时的数据库环境-->
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<!--修改的第一处，配置数据库信息，根据自己的数据库修改-->
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/Company"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</dataSource>
</environment>
</environments>
<mappers>
<!--加载映射文件-->
<mapper resource="org/lanqiao/mapper/empinfoMapper.xml"/><!--修改的第二处-->
</mappers>
</configuration>3.
package org.lanqiao.entity;
public class Empinfo {
private int eid;
private String name;
private int age;
private String sex;
private String phone;
//无参构造
public Empinfo () {
}
//有参构造
public Empinfo (int eid, String name, int age, String sex, String phone) {
super();
this.eid = eid;
this.name = name;
this.age = age;
this.sex = sex;
this.phone = phone;
}
/**
* @return the eid
*/
public int getEid() {
return eid;
}
/**
* @param eid the eid to set
*/
public void setEid(int eid) {
this.eid = eid;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the age
*/
public int getAge() {
return age;
}
/**
* @param age the age to set
*/
public void setAge(int age) {
this.age = age;
}
/**
* @return the sex
*/
public String getSex() {
return sex;
}
/**
* @param sex the sex to set
*/
public void setSex(String sex) {
this.sex = sex;
}
/**
* @return the phone
*/
public String getPhone() {
return phone;
}
/**
* @param phone the phone to set
*/
public void setPhone(String phone) {
this.phone = phone;
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return eid+"-"+name+"-"+age+"-"+sex+"-"+phone ;
}
}
4.
<?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="org.lanqiao.mapper.EmpinfoMapper">
<!-- （1）.按eid查询Empinfo -->
<select id="queryEmpinfoByeid" resultType="org.lanqiao.entity.Empinfo" parameterType="int">
select* from empinfo where eid=#{eid}
</select>
<!-- （4）.查询所有Empinfo -->
<select id="queryAllEmpinfos" resultType="org.lanqiao.entity.Empinfo">
select * from empinfo
</select>
<!-- （5）.增加 -->
<insert id="addEmpinfo" parameterType="org.lanqiao.entity.Empinfo">
insert into empinfo(eid,name,age,sex,phone) values(#{eid},#{name},#{age},#{sex},#{phone})
</insert>
<!-- （6）.删除 -->
<delete id="deleteEmpinfoByeid" parameterType="org.lanqiao.entity.Empinfo">
delete from empinfo where eid=#{eid}
</delete>
<!-- （7）.修改 -->
<update id="updateEmpinfoByeid" parameterType="org.lanqiao.entity.Empinfo">
update empinfo set name=#{name},age=#{age},sex=#{sex} where eid=#{eid}
</update>
</mapper>5.
package org.lanqiao.mapper;
import java.util.List;
import org.lanqiao.entity.Empinfo;
public interface EmpinfoMapper {
/*
* 1.方法名和mapper.xml文件中标签的id值相同
* 2.方法的输入参数和mapper.xml文件中标签的parameterType类型一致
* 3.方法的返回值 和mapper.xml文件中标签的resultType类型一致
*
*/
//（1）.按eid查询Empinfo
Empinfo queryEmpinfoByeid(int eid);
//（4）.查询所有Empinfo
List<Empinfo> queryAllEmpinfos();
//（5）.增加
void addEmpinfo(Empinfo empinfo);
//（6）.删除
void deleteEmpinfoByeid(int eid);
//（7）.修改
void updateEmpinfoByeid(Empinfo empinfo);
}
6.
package org.lanqiao.test;
import java.io.IOException;
import java.io.Reader;
import java.util.List;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.lanqiao.entity.Empinfo;
import org.lanqiao.mapper.EmpinfoMapper;
public class TestEmpinfo {
//（1）.按eid查询Empinfo
public static void queryEmpinfoByeid() throws IOException {
Reader reader = Resources.getResourceAsReader("empinfoConf.xml");
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
SqlSession session = sessionFactory.openSession();
EmpinfoMapper empinfoMapper = session.getMapper(EmpinfoMapper.class);
Empinfo empinfo=empinfoMapper.queryEmpinfoByeid(2017051133);
System.out.println(empinfo);
session.close();
}
//（4）.查询所有Empinfo
public static void queryAllEmpinfos() throws IOException {
Reader reader = Resources.getResourceAsReader("empinfoConf.xml");
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
SqlSession session = sessionFactory.openSession();
String statement = "org.lanqiao.entity.empinfoMapper."+"queryAllEmpinfos";
//List<Empinfo> empinfos = session.selectList(statement);
EmpinfoMapper empinfoMapper = session.getMapper(EmpinfoMapper.class);
List<Empinfo> empinfos=empinfoMapper.queryAllEmpinfos();
System.out.println(empinfos);
session.close();
}
//（5）.增加
public static void addEmpinfo() throws IOException {
Reader reader = Resources.getResourceAsReader("empinfoConf.xml");
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
SqlSession session = sessionFactory.openSession();
//String statement = "org.lanqiao.entity.empinfoMapper."+"addEmpinfo";
Empinfo empinfo= new Empinfo(2017059,"ljq",23,"男",1211231123);
//int count=session.insert(statement,empinfo);//statement:执行指定的SQL student:sql中需要的参数(？？？)
EmpinfoMapper empinfoMapper = session.getMapper(EmpinfoMapper.class);
empinfoMapper.addEmpinfo(empinfo);
session.commit();//提交事务
System.out.print("增加成功；");
System.out.println(empinfo);
session.close();
}
//（6）.删除
public static void deleteEmpinfoByeid() throws IOException {
Reader reader = Resources.getResourceAsReader("empinfoConf.xml");
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
SqlSession session = sessionFactory.openSession();
//String statement = "org.lanqiao.entity.empinfoMapper."+"deleteEmpinfoByeid";
//int count=session.delete(statement,20170519);
EmpinfoMapper empinfoMapper =session.getMapper(EmpinfoMapper.class);
empinfoMapper.deleteEmpinfoByeid(2017059);
session.commit();//提交事务
System.out.println("删除成功；");
session.close();
}
//（7）.修改
public static void updateEmpinfoByeid() throws IOException {
Reader reader = Resources.getResourceAsReader("empinfoConf.xml");
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
SqlSession session = sessionFactory.openSession();
//String statement = "org.lanqiao.entity.empinfoMapper."+"updateEmpinfoByeid";
Empinfo empinfo= new Empinfo();
empinfo.setEid(2017059);
empinfo.setName("fy");
empinfo.setAge(22);
empinfo.setSex("男");
empinfo.setPhone(1234567890);
//int count=session.update(statement,empinfo);
EmpinfoMapper empinfoMapper =session.getMapper(EmpinfoMapper.class);
empinfoMapper.updateEmpinfoByeid(empinfo);
session.commit();//提交事务
System.out.print("修改成功；");
System.out.println(empinfo);
session.close();
}
public static void main(String[] args) throws IOException {
queryEmpinfoByeid();//按eid查询单个Empinfo
//queryAllEmpinfos();
//addEmpinfo();
//deleteEmpinfoByeid();
//updateEmpinfoByeid();
}
}
