SpringBoot学习（三）（整合JdbcTemplate、mybatis注解版、springdatajpa）

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=true

    ③Mapper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/

转载于:https://my.oschina.net/caofanqi/blog/3010732

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