spring data jpa 使用SQL語句查詢

package com.ytkj.entity;

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

/**
 *          @Entity
 *         	作用：指定當前類是實體類。
 *         @Table
 *         	作用：指定實體類和表之間的對應關系。
 *         	屬性：
 *         		name：指定數據庫表的名稱
 *         @Id
 *         	作用：指定當前字段是主鍵。
 *         @GeneratedValue
 *         	作用：指定主鍵的生成方式。。
 *         	屬性：
 *         		strategy ：指定主鍵生成策略。
 *         @Column
 *         	作用：指定實體類屬性和數據庫表之間的對應關系
 *         	屬性：
 *         		name：指定數據庫表的列名稱。
 *         		unique：是否唯一
 *         		nullable：是否可以為空
 *         		inserttable：是否可以插入
 *         		updateable：是否可以更新
 *         		columnDefinition: 定義建表時創建此列的DDL
 *         		secondaryTable: 從表名。如果此列不建在主表上（默認建在主表），該屬性定義該列所在從表的名字搭建開發環境[重點]
 *
 * 客戶實體類
 *      配置映射關系
 *          實體類和表映射
 *          實體類屬性和表字段映射
 */
@Entity
@Table(name = "cst_customer")
public class Customer implements Serializable {
    /**
     * 聲明主鍵配置
     */
    @Id
    /**
     * 配置主鍵的生成策略
     */
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    /**
     * 指定實體類屬性和數據庫表之間的對應關系
     */
    @Column(name ="cust_id")
    private Long custId;//客戶主鍵
    @Column(name = "cust_name")
    private String custName;//客戶名稱
    @Column(name ="cust_source" )
    private String custSource;//客戶來源
    @Column(name = "cust_industry")
    private String custIndustry;//客戶行業
    @Column(name ="cust_level")
    private String custLevel;//客戶級別
    @Column(name ="cust_address")
    private String custAddress;//客戶地址
    @Column(name = "cust_phone")
    private String custPhone;//客戶電話

    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.Modifying;
import org.springframework.data.jpa.repository.Query;

import java.util.List;

/**
 * JpaRepository<實體類類型，主鍵類型>：用來完成基本CRUD操作
 * JpaSpecificationExecutor<實體類類型>：用於復雜查詢（分頁等查詢操作）
 */
public interface CustomerDao2 extends JpaRepository<Customer,Long>, JpaSpecificationExecutor<Customer> {
    /**
     * 使用sql查詢
     * nativeQuery = true:使用sql查詢
     * nativeQuery = false:使用jpql查詢，默認就是false
     */
    @Query(value = "select  * from cst_customer",nativeQuery = true)
    List<Customer> findAll();

    /**
     * 使用sql條件查詢
     *  占位符
     *      方法參數順序盡量和占位符位置一樣
     * nativeQuery = true:使用sql查詢
     * nativeQuery = false:使用jpql查詢，默認就是false
     */
    @Query(value = "select  * from cst_customer where cust_name=? ",nativeQuery = true)
    Customer findByName(String name);

}

　　

import com.ytkj.dao.CustomerDao2;
import com.ytkj.entity.Customer;
import jdk.nashorn.internal.parser.Lexer;
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)//聲明spring提供的單元測試環境
@ContextConfiguration(locations = "classpath:applicationContext.xml")//指定spring容器的配置信息
public class SpringdatajpaSqlTest {

    @Autowired
    CustomerDao2 customerDao2;
    @Test
    public  void  findAll(){
        List<Customer> list = customerDao2.findAll();
        for (int i=0;i<list.size();i++){
            Customer customer = list.get(i);
            System.out.println(customer);
        }
    }

    @Test
    public void findByName(){
        Customer customer = customerDao2.findByName("中國人");
        System.out.println(customer);
    }
}