Dao层

//PetDao.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.WebTest01.dao.PetDao">
    <select id="getByName" parameterType="java.lang.String" resultType="com.WebTest01.domain.Pet">
        select * from pet where name = #{name}
    </select>
    <select id="getAll" resultType="com.WebTest01.domain.Pet">
        select * from pet
    </select>
    <insert id="insertPet">
        insert into pet(name,age,owner) values(#{name},#{age},#{owner})
    </insert>
    <update id="updatePet">
        update pet set name = #{name}, owner = #{owner} where age = #{age}
    </update>
    <delete id="deletePet">
        delete from pet where age = #{age}
    </delete>
</mapper>

//PetDao.java

package com.WebTest01.dao;

import com.WebTest01.domain.Pet;

import java.util.List;

public interface PetDao {

    public Pet getByName(String name);

    public List<Pet> getAll();

    public void insertPet(Pet pet);

    public void updatePet(Pet pet);

    public void deletePet(Pet pet);

}

//PetService.java

package com.WebTest01.service;

import com.WebTest01.domain.Pet;

import java.util.List;

public interface PetService {

    public Pet getByName(String name);

    public List<Pet> getAll();

    public void insertPet(Pet pet);

    public void updatePet(Pet pet);

    public void deletePet(Pet pet);

}

//PetServiceImpl.java

package com.WebTest01.service.Impl;

import com.WebTest01.dao.PetDao;
import com.WebTest01.domain.Pet;
import com.WebTest01.service.PetService;
import com.WebTest01.util.SqlSessionUtil;

import java.util.List;

public class PetServiceImpl implements PetService {
    //mybatis动态代理创建PetDao实现类
    private PetDao petDao = SqlSessionUtil.getSession().getMapper(PetDao.class);

    @Override
    public Pet getByName(String name) {
        return petDao.getByName(name);
    }

    @Override
    public List<Pet> getAll() {
        return petDao.getAll();
    }

    @Override
    public void insertPet(Pet pet) {
        petDao.insertPet(pet);
    }

    @Override
    public void updatePet(Pet pet) {
        petDao.updatePet(pet);
    }

    @Override
    public void deletePet(Pet pet) {
        petDao.deletePet(pet);
    }
}

//Test

package com.WebTest01.test;

import com.WebTest01.domain.Pet;
import com.WebTest01.service.Impl.PetServiceImpl;
import com.WebTest01.service.PetService;
import com.WebTest01.util.ServiceFactory;

public class Test01 {
    public static void main(String[] args) {
        PetService petService = (PetService) ServiceFactory.getService(new PetServiceImpl());
        Pet pet = new Pet("ttt", "S", 9999);
        petService.deletePet(pet);
    }
}