SpringBoot JPA(实现查询多值)

 1 <dependency>
 2             <groupid>org.springframework.boot</groupid>
 3             <artifactid>spring-boot-starter-jdbc</artifactid>
 4         </dependency>
 5         <!-- 数据库驱动 -->
 6         <dependency>
 7             <groupid>com.oracle</groupid>
 8             <artifactid>ojdbc6</artifactid>
 9             <version>11.2.0.3</version>
10         </dependency>

1 <!-- 定义spring-boot-starter-data-jpa -->
2           <dependency>
3               <groupid>org.springframework.boot</groupid>
4               <artifactid>spring-boot-starter-data-jpa</artifactid>
5           </dependency>

 1 package cn.xdl.entity;
 2 
 3 import java.io.serializable;
 4 
 5 import javax.persistence.column;
 6 import javax.persistence.entity;
 7 import javax.persistence.id;
 8 import javax.persistence.table;
 9 
10 @entity
11 @table(name="emp")  //通常和@entity配合使用,只能标注在实体的class定义处,表示实体对应的数据库表的信息
12 public class emp implements serializable{
13     /**
14      * 
15      */
16     private static final long serialversionuid = 1l;
17     @id  //定义了映射到数据库表的主键的属性,一个实体只能有一个属性被映射为主键置于getxxxx()前
18     @column(name="empno")  //name表示表的名称默认地,表名和实体名称一致,只有在不一致的情况下才需要指定表名
19     private integer empno;
20     @column(name="ename")
21     private string ename;
22     @column(name="job")
23     private string job;
24     @column(name="mgr")
25     private int mgr;
26     public integer getempno() {
27         return empno;
28     }
29     public void setempno(integer empno) {
30         this.empno = empno;
31     }
32     public string getename() {
33         return ename;
34     }
35     public void setename(string ename) {
36         this.ename = ename;
37     }
38     public string getjob() {
39         return job;
40     }
41     public void setjob(string job) {
42         this.job = job;
43     }
44     public int getmgr() {
45         return mgr;
46     }
47     public void setmgr(int mgr) {
48         this.mgr = mgr;
49     }
50     @override
51     public string tostring() {
52         return "emp [empno=" + empno + ", ename=" + ename + ", job=" + job + ", mgr=" + mgr + "]";
53     }
54 }

 1 package cn.xdl.jpa;
 2 
 3 import org.springframework.data.jpa.repository.jparepository;
 4 
 5 import cn.xdl.entity.emp;
 6 //jparepository:jpa资源库
 7 /**
 8  * 1.所有继承该接口的都被spring所管理，改接口作为标识接口，功能就是用来控制domain模型的
 9  * 2.spring data可以让我们只定义接口，只要遵循spring data的规范,无需写实现类。 
10  *
11  */
12 public interface empdao extends jparepository<emp, integer>{
13 
14 }

 1 @springbootapplication
 2 public class mybootapplication {
 3     public static void main(string[] args) throws sqlexception {
 4         applicationcontext ioc = springapplication.run(mybootapplication.class, args);
 5         // 自动配置创建datasource，id名为datasource
 6         datasource ds = ioc.getbean("datasource", datasource.class);
 7         system.out.println(ds);
 8         system.out.println("=================");
 9         system.out.println("=================");
10         system.out.println("=================");
11         empdao empdao = ioc.getbean("empdao", empdao.class);
12         /**
13          * 遍历
14          */
15         list<emp> empdatas = empdao.findall();
16         for (emp emp : empdatas) {
17             system.out.println(emp);
18         }
19     }
20 }