整合之前
1、pom.xml添加mysql依赖
<!-- mysql 依赖 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>2、application.properties加入数据库连接配置
#################################数据库连接配置########
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/stuspringboot
spring.datasource.username=root
spring.datasource.password=root一、整合JdbcTemplate
1、pom.xml添加相关依赖
<!-- mysql 依赖 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- jdbcTemplate 依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>2、UserServiceImpl使用JdbcTemplate
@Service
public class UserServiceImpl implements UserService {
@Autowired
private JdbcTemplate jdbcTemplate;
@Transactional
public User add(String name,Integer age) {
User user = new User(name,age);
jdbcTemplate.update("INSERT INTO user VALUES(?,?,?)", user.getId(), user.getName(), user.getAge());
return user;
}
}3、 UserController
@RestController
@RequestMapping(value = "/user")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping(value = "/add",method = RequestMethod.POST)
public User add(String name,Integer age){
User user = userService.add(name, age);
return user;
}
}4、启动项目测试成功
二、整合Mybatis(注解版)
1、pom.xml添加依赖
<!-- mybatis 依赖 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>2、UserMapper
public interface UserMapper {
@Select("SELECT * FROM USER WHERE name = #{name}")
User findByName(@Param("name") String name);
}3、UserServiceImpl
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public User findByName(String name) {
return userMapper.findByName(name);
}
}注入userMapper时，在IDEA环境下会报错，但是不影响使用，如果看着不爽，可以参考https://www.cnblogs.com/waterystone/p/6214212.html 解决
4、UserController添加
@RequestMapping(value = "/{name}",method = RequestMethod.GET)
public User find(@PathVariable String name){
User user = userService.findByName(name);
return user;
}5、启动类添加@MapperScan
@SpringBootApplication
@MapperScan(basePackages = "com.caofanqi.mapper")
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}6、启动测试如下
7、整合Mybatis分页插件PageHelper
①pom.xml添加
<!-- springboot 整合 pagehelper -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.5</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.7</version>
</dependency>②application.properties配置文件添加
###################pagehelper分页插件#####################
logging.level.com.example.demo.dao=DEBUG
pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql
pagehelper.page-size-zero=true③Mapper添加方法
@Select("SELECT * FROM USER")
List<User> list();④UserServiceImpl添加方法，page当前页，size当前页数量
public List<User> list(Integer page,Integer size){
// 开启分页插件,放在查询语句上面
PageHelper.startPage(page, size);
//查询语句
List<User> userList = userMapper.list();
// 封装分页之后的数据
PageInfo<User> pageInfoUserList = new PageInfo<User>(userList);
//通过getList()获取分页后的数据
return pageInfoUserList.getList();
}⑤UserController添加代码
@RequestMapping(value = "/list/{page}/{size}",method = RequestMethod.GET)
public List<User> list(@PathVariable Integer page,@PathVariable Integer size){
return userService.list(page,size);
}⑥运行测试如下
三、整合SpringDataJpa
1、pom.xml添加
<!-- 整合 springdatajpa -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>2、实体类
package com.caofanqi.entity;
import com.caofanqi.util.StringUtil;
import lombok.Data;
import javax.persistence.*;
@Data
@Entity(name="user")
public class User {
/**
* JPA提供的四种标准用法为TABLE,SEQUENCE,IDENTITY,AUTO.
* TABLE：使用一个特定的数据库表格来保存主键。
* SEQUENCE：根据底层数据库的序列来生成主键，条件是数据库支持序列。
* IDENTITY：主键由数据库自动生成（主要是自动增长型）
* AUTO：主键由程序控制,如果不指定主键生成策略，默认为AUTO
*/
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private String id;
private String name;
private Integer age;
/**
* 对应的数据库字段，默认驼峰命名法，如果不一致可以通过@Column的name属性修改
*/
@Column(name = "id_card")
private String idCard;
public User(String name, Integer age) {
this.id = StringUtil.guid();
this.name = name;
this.age = age;
}
}3、UserDao
package com.caofanqi.dao;
import com.caofanqi.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface UserDao extends JpaRepository<User,String> {
/**
* 可以通过@Query，并设置nativeQuery = true，写SQL语句
* 注意：LIMIT 的以一个参数是起始行数 =（当前页-1）* pageSize
*/
@Query(value = "SELECT * FROM user LIMIT ?1,?2",nativeQuery = true)
List<User> list(Integer startRow, Integer pageSize);
}4、UserServiceImpl添加userDao注入和方法
@Autowired
private UserDao userDao;
public User findById(String id){
Optional<User> opUser = userDao.findById(id);
return opUser.get();
}5、UserController添加方法
@RequestMapping(value = "/find/{id}",method = RequestMethod.GET)
public User findById(@PathVariable String id){
User user = userService.findById(id);
return user;
}6、启动运行如下
项目源码：https://gitee.com/itcaofanqi/CaoFanqiStudyRepository/tree/master/stuspringboot/