Flask接口签名sign原理与实例代码浅析
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2023-05-27
SpringBoot入门系列之JPA mysql
一,准备工作,建立spring-boot-sample-mysql工程
1、http://start.spring.io/
A、Artifact中输入spring-boot-sample-MySQL
B、勾选Web下的web
C、勾选SQL下的JPA MYSQL
2、Eclips中导入工程spring-boot-sample-mysql
A、解压快捷工程spring-boot-sample-mysql到某文件夹
B、eclips中file->import->Import Existing Maven Projects-->Select Maven projects-->finish导入工程
3、工程导入之后,文件结构如下图
4、在包com.example下建立web文件夹
5、便于测试,引入spring-boot-sample-helloworld的HelloController及配置文件logback.xml
HelloController代码为
package com.example.web;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
protected static Logger logger=LoggerFactory.getLogger(HelloController.class);
@RequestMapping("/")
public String helloworld(){
logger.debug("访问hello");
return "Hello world!";
}
@RequestMapping("/hello/{name}")
public String helloName(@PathVariable String name){
logger.debug("访问helloName,Name={}",name);
return "Hello "+name;
}
}
logback.xml配置为
class="ch.qos.logback.core.rolling.RollingFileAppender"> %d %p (%file:%line\)- %m%n
class="ch.qos.logback.core.rolling.RollingFileAppender">
%d %p (%file:%line\)- %m%n
注:logback.xml文件位于src/main/resources下
6、启动工程,通过浏览器查看正确性
http://localhost:8080/
http://localhost:8080/hello/上帝
二,使用JPA,构建业务对象及访问库
1、在包com.example下建立domain文件夹
2、在domain中建立类Person
package com.example.domain;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
@Entity
public class Person {
@Id
@GeneratedValue
private Long id;
private String name;
private Integer age;
private String address;
public Person() {
super();
}
public Person(Long id, String name, Integer age, String address) {
super();
this.id = id;
this.name = name;
this.age = age;
this.address = address;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
注意:构造函数
3、在包com.example下建立repository文件夹
4、在repository中建立接口PersonRepository
package com.example.repository;
import java.util.List;
import org.springframework.data.jpa.repository.JpaRepository;
import orghttp://.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
import com.example.domain.Person;
@Repository
public interface PersonRepository extends JpaRepository
List
List
List
@Query("select p from Person p where p.name=:name and p.address=:address")
List
}
5、在web中建立DataController
package com.example.web;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.data.domain.Sort.Direction;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.example.domain.Person;
import com.example.repository.PersonRepository;
@RestController
public class DataController {
protected static Logger logger=LoggerFactory.getLogger(DataController.class);
@Autowired
PersonRepository personRepository;
@RequestMapping("/save")
public Person save(String name,String address,Integer age){
logger.debug("save 开始");
Person p=personRepository.save(new Person(null,name,age,address));
logger.debug("save 结束");
return p;
}
@RequestMapping("/q1")
public List
logger.debug("q1 开始");
logger.debug("q1 接收参数address={}",address);
List
return people;
}
@RequestMapping("/q2")
public List
logger.debug("q2 开始");
logger.debug("q2接收参数name={},address={}",name,address);
return personRepository.findByNameAndAddress(name, address);
}
@RequestMapping("/q3")
public List
logger.debug("q3 开始");
logger.debug("q3接收参数name={},address={}",name,address);
return personRepository.withNameAndAddressQuery(name, address);
}
@RequestMapping("/sort")
public List
logger.debug("sort 开始");
List
return people;
}
@RequestMapping("/page")
public Page
logger.debug("page 开始");
Page
return people;
}
}
6、配置数据库连接,在application.properties(src/main/resources下)
spring.datasource.url=jdbc:mysql://192.168.56.201:3306/bootsample?useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
spring.jackson.serialization.indent_output=true
7、运行测试
A、先保存数据
http://localhost:8080/save?name=aa&&address=北京&&age=1
http://localhost:8080/save?name=ab&&address=北京&&age=2
http://localhost:8080/save?name=cq1&&address=重庆&&age=50
http://localhost:8080/save?name=cq2&&address=重庆&&age=51
B、查询q1
http://localhost:8080/q1?address=北京
C、查询q2
http://localhost:8080/q2?address=北京&&name=aa
D、查询q3
http://localhost:8080/q3?address=北京&&name=aa
E、排序
http://localhost:8080/sort
F、分页
http://localhost:8080/page
运用hibernate访问mysql,基本也是老技术,只是用JPA简化了dao层代码,对于业务对象基本没有变化。
以上所述是给大家介绍的SpringBoot入门系列之JPA mysql,希望对大家有所帮助,如果大家有任何疑问请给我留言,会及时回复大家的。在此也非常感谢大家对我们网站的支持!
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