spring data jpa 使用方法命名规则查询

按照Spring Data JPA 定义的规则，查询方法以findBy开头，涉及条件查询时，条件的属性用条件关键字连接，要注意的是：条件属性首字母需大写。框架在进行方法名解析时，会先把方法名多余的前缀截取掉，然后对剩下部分进行解析。

Keyword	Sample	JPQL
And	findByLastnameAndFirstname	… where x.lastname = ?1 and x.firstname = ?2
Or	findByLastnameOrFirstname	… where x.lastname = ?1 or x.firstname = ?2
Is,Equals	findByFirstnameIs, findByFirstnameEquals	… where x.firstname = ?1
Between	findByStartDateBetween	… where x.startDate between ?1 and ?2
LessThan	findByAgeLessThan	… where x.age < ?1
LessThanEqual	findByAgeLessThanEqual	… where x.age ⇐ ?1
GreaterThan	findByAgeGreaterThan	… where x.age > ?1
GreaterThanEqual	findByAgeGreaterThanEqual	… where x.age >= ?1
After	findByStartDateAfter	… where x.startDate > ?1
Before	findByStartDateBefore	… where x.startDate < ?1
IsNull	findByAgeIsNull	… where x.age is null
IsNotNull,NotNull	findByAge(Is)NotNull	… where x.age not null
Like	findByFirstnameLike	… where x.firstname like ?1
NotLike	findByFirstnameNotLike	… where x.firstname not like ?1
StartingWith	findByFirstnameStartingWith	… where x.firstname like ?1 (parameter bound with appended %)
EndingWith	findByFirstnameEndingWith	… where x.firstname like ?1 (parameter bound with prepended %)
Containing	findByFirstnameContaining	… where x.firstname like ?1 (parameter bound wrapped in %)
OrderBy	findByAgeOrderByLastnameDesc	… where x.age = ?1 order by x.lastname desc
Not	findByLastnameNot	… where x.lastname <> ?1
In	findByAgeIn(Collection ages)	… where x.age in ?1
NotIn	findByAgeNotIn(Collection age)	… where x.age not in ?1
TRUE	findByActiveTrue()	… where x.active = true
FALSE	findByActiveFalse()	… where x.active = false
IgnoreCase	findByFirstnameIgnoreCase	… where UPPER(x.firstame) = UPPER(?1)

package com.ytkj.entity;

import javax.persistence.*;
import java.io.Serializable;

/**
 *          @Entity
 *         	作用：指定当前类是实体类。
 *         @Table
 *         	作用：指定实体类和表之间的对应关系。
 *         	属性：
 *         		name：指定数据库表的名称
 *         @Id
 *         	作用：指定当前字段是主键。
 *         @GeneratedValue
 *         	作用：指定主键的生成方式。。
 *         	属性：
 *         		strategy ：指定主键生成策略。
 *         @Column
 *         	作用：指定实体类属性和数据库表之间的对应关系
 *         	属性：
 *         		name：指定数据库表的列名称。
 *         		unique：是否唯一
 *         		nullable：是否可以为空
 *         		inserttable：是否可以插入
 *         		updateable：是否可以更新
 *         		columnDefinition: 定义建表时创建此列的DDL
 *         		secondaryTable: 从表名。如果此列不建在主表上（默认建在主表），该属性定义该列所在从表的名字搭建开发环境[重点]
 *
 * 客户实体类
 *      配置映射关系
 *          实体类和表映射
 *          实体类属性和表字段映射
 */
@Entity
@Table(name = "cst_customer")
public class Customer implements Serializable {
    /**
     * 声明主键配置
     */
    @Id
    /**
     * 配置主键的生成策略
     */
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    /**
     * 指定实体类属性和数据库表之间的对应关系
     */
    @Column(name ="cust_id")
    private Long custId;//客户主键
    @Column(name = "cust_name")
    private String custName;//客户名称
    @Column(name ="cust_source" )
    private String custSource;//客户来源
    @Column(name = "cust_industry")
    private String custIndustry;//客户行业
    @Column(name ="cust_level")
    private String custLevel;//客户级别
    @Column(name ="cust_address")
    private String custAddress;//客户地址
    @Column(name = "cust_phone")
    private String custPhone;//客户电话

    public Long getCustId() {
        return custId;
    }

    public void setCustId(Long custId) {
        this.custId = custId;
    }

    public String getCustName() {
        return custName;
    }

    public void setCustName(String custName) {
        this.custName = custName;
    }

    public String getCustSource() {
        return custSource;
    }

    public void setCustSource(String custSource) {
        this.custSource = custSource;
    }

    public String getCustIndustry() {
        return custIndustry;
    }

    public void setCustIndustry(String custIndustry) {
        this.custIndustry = custIndustry;
    }

    public String getCustLevel() {
        return custLevel;
    }

    public void setCustLevel(String custLevel) {
        this.custLevel = custLevel;
    }

    public String getCustAddress() {
        return custAddress;
    }

    public void setCustAddress(String custAddress) {
        this.custAddress = custAddress;
    }

    public String getCustPhone() {
        return custPhone;
    }

    public void setCustPhone(String custPhone) {
        this.custPhone = custPhone;
    }

    @Override
    public String toString() {
        return "Customer{" +
                "custId=" + custId +
                ", custName='" + custName + '\'' +
                ", custSource='" + custSource + '\'' +
                ", custIndustry='" + custIndustry + '\'' +
                ", custLevel='" + custLevel + '\'' +
                ", custAddress='" + custAddress + '\'' +
                ", custPhone='" + custPhone + '\'' +
                '}';
    }
}

　　

package com.ytkj.dao;

import com.ytkj.entity.Customer;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.data.jpa.repository.Query;

import java.util.List;

/**
 * JpaRepository<实体类类型，主键类型>：用来完成基本CRUD操作
 * JpaSpecificationExecutor<实体类类型>：用于复杂查询（分页等查询操作）
 */
public interface CustomerDao3 extends JpaRepository<Customer,Long>, JpaSpecificationExecutor<Customer> {

    /**
     * 按照Spring Data JPA 定义的规则，查询方法以findBy开头，涉及条件查询时，条件的属性用条件关键字连接，
     * 要注意的是：条件属性首字母需大写。框架在进行方法名解析时，会先把方法名多余的前缀截取掉，然后对剩下部分进行解析。
     * 方法命名规则查询
     *      方法名的约定
     *          findBy:查询
     *              对象中的属性名（首字母大写）：查询的条件
     *
     *
     */
    public Customer findByCustName(String name);

    public  List<Customer> findByCustNameLike(String name);

}

　　

import com.ytkj.dao.CustomerDao3;
import com.ytkj.entity.Customer;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.List;

@RunWith(SpringJUnit4ClassRunner.class)//声明spring提供的单元测试环境
@ContextConfiguration(locations = "classpath:applicationContext.xml")//指定spring容器的配置信息
public class SpringdatajpaMethodTest {
    @Autowired
    CustomerDao3 customerDao3;

    @Test
    public void  findByName(){
        Customer customer = customerDao3.findByCustName("哈哈哈");
        System.out.println(customer);
    }

    @Test
    public void  findByName2(){
        List<Customer> list = customerDao3.findByCustNameLike("zhe");
        for (int i=0;i<list.size();i++){
            Customer customer = list.get(i);
            System.out.println(customer);
        }
    }
}