一：引入jdbcTemplate依赖

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

如果在JPA已经加入的话，则可以不用引入以上的配置。
<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

编写DAO

直接使用就可以了

@Resource

private JdbcTemplate jdbcTemplate;

package com.mt.dog.dao;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Repository;

import com.mt.dog.entity.Dog;

@Repository
public class DogDao {
    @Resource
    private JdbcTemplate jdbcTemplate;

    public Dog getDogById(Long id) {
        String sql = "select * from dog where id=? ";
        RowMapper<Dog> rowMapper = new BeanPropertyRowMapper<>(Dog.class);
        List<Dog> dogs = jdbcTemplate.query(sql, new Object[] { id }, rowMapper);
        return dogs.get(0);
    }
}
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