SpringBoot入門系列之JPA mysql。本站提示廣大學習愛好者：（SpringBoot入門系列之JPA mysql）文章只能為提供參考，不一定能成為您想要的結果。以下是SpringBoot入門系列之JPA mysql正文
一，准備工作，建立spring-boot-sample-mysql工程
1、http://start.spring.io/
A、Artifact中輸入spring-boot-sample-MySQL
B、勾選Web下的web
C、勾選SQL下的JPA MYSQL
2、Eclips中導入工程spring-boot-sample-mysql
A、解壓快捷工程spring-boot-sample-mysql到某文件夾
B、eclips中file->import->Import Existing Maven Projects-->Select Maven projects-->finish導入工程
3、工程導入之後，文件結構如下圖
4、在包com.example下建立web文件夾
5、便於測試，引入spring-boot-sample-helloworld的HelloController及配置文件logback.xml
HelloController代碼為
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("訪問hello");
return "Hello world!";
}
@RequestMapping("/hello/{name}")
public String helloName(@PathVariable String name){
logger.debug("訪問helloName,Name={}",name);
return "Hello "+name;
}
}
logback.xml配置為
<configuration>
<!-- %m輸出的信息,%p日志級別,%t線程名,%d日期,%c類的全名,,,, -->
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d %p (%file:%line\)- %m%n</pattern>
<charset>GBK</charset>
</encoder>
</appender>
<appender name="baselog"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<File>log/base.log</File>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>log/base.log.%d.i%</fileNamePattern>
<timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
<!-- or whenever the file size reaches 64 MB -->
<maxFileSize>64 MB</maxFileSize>
</timeBasedFileNamingAndTriggeringPolicy>
</rollingPolicy>
<encoder>
<pattern>
%d %p (%file:%line\)- %m%n
</pattern>
<charset>UTF-8</charset> <!-- 此處設置字符集 -->
</encoder>
</appender>
<root level="info">
<appender-ref ref="STDOUT" />
</root>
<logger name="com.example" level="DEBUG">
<appender-ref ref="baselog" />
</logger>
</configuration>
注：logback.xml文件位於src/main/resources下
6、啟動工程，通過浏覽器查看正確性
http://localhost:8080/
http://localhost:8080/hello/上帝
二，使用JPA,構建業務對象及訪問庫
1、在包com.example下建立domain文件夾
2、在domain中建立類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：構造函數
3、在包com.example下建立repository文件夾
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 org.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<Person,Long> {
List<Person> findByName(String name);
List<Person> findByAddress(String address);
List<Person> findByNameAndAddress(String name,String address);
@Query("select p from Person p where p.name=:name and p.address=:address")
List<Person> withNameAndAddressQuery(@Param("name")String Name,@Param("address")String address);
}
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 開始");
Person p=personRepository.save(new Person(null,name,age,address));
logger.debug("save 結束");
return p;
}
@RequestMapping("/q1")
public List<Person> q1(String address){
logger.debug("q1 開始");
logger.debug("q1 接收參數address={}",address);
List<Person> people=personRepository.findByAddress(address);
return people;
}
@RequestMapping("/q2")
public List<Person> q2(String name,String address){
logger.debug("q2 開始");
logger.debug("q2接收參數name={},address={}",name,address);
return personRepository.findByNameAndAddress(name, address);
}
@RequestMapping("/q3")
public List<Person> q3(String name,String address){
logger.debug("q3 開始");
logger.debug("q3接收參數name={},address={}",name,address);
return personRepository.withNameAndAddressQuery(name, address);
}
@RequestMapping("/sort")
public List<Person> sort(){
logger.debug("sort 開始");
List<Person> people=personRepository.findAll(new Sort(Direction.ASC,"age"));
return people;
}
@RequestMapping("/page")
public Page<Person> page(){
logger.debug("page 開始");
Page<Person> people=personRepository.findAll(new PageRequest(1,2));
return people;
}
}
6、配置數據庫連接，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、運行測試
A、先保存數據
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=重慶&&age=50
http://localhost:8080/save?name=cq2&&address=重慶&&age=51
B、查詢q1
http://localhost:8080/q1?address=北京
C、查詢q2
http://localhost:8080/q2?address=北京&&name=aa
D、查詢q3
http://localhost:8080/q3?address=北京&&name=aa
E、排序
http://localhost:8080/sort
F、分頁
http://localhost:8080/page
運用hibernate訪問mysql，基本也是老技術，只是用JPA簡化了dao層代碼，對於業務對象基本沒有變化。
以上所述是小編給大家介紹的SpringBoot入門系列之JPA mysql，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對網站的支持！
