搭建SpringData项目

SpringDataJPA是Spring基于ORM框架，JPA规范的基础上封装的一套JPA应用框架。

1.首先创建一个maven环境，并导入坐标

pom.xml文件的导入

 
        5.2.7.RELEASE
        5.4.10.Final
        1.6.6
        1.2.12
        0.9.1.2
        5.1.6
    

    
        
        
            junit
            junit
            4.12
            test
        

        
        
            org.aspectj
            aspectjweaver
            1.6.8
        

        
            org.springframework
            spring-aop
            ${spring.version}
        

        
            org.springframework
            spring-context
            ${spring.version}
        

        
            org.springframework
            spring-context-support
            ${spring.version}
        

        
            org.springframework
            spring-orm
            ${spring.version}
        

        
            org.springframework
            spring-beans
            ${spring.version}
        

        
            org.springframework
            spring-core
            ${spring.version}
        

        

        
        
            org.hibernate
            hibernate-core
            ${hibernate.version}
        
        
            org.hibernate
            hibernate-entitymanager
            ${hibernate.version}
        
        
            org.hibernate
            hibernate-validator
            5.2.1.Final
        
        

        
        
            c3p0
            c3p0
            ${c3p0.version}
        
        

        
        
            log4j
            log4j
            ${log4j.version}
        

        
            org.slf4j
            slf4j-api
            ${slf4j.version}
        

        
            org.slf4j
            slf4j-log4j12
            ${slf4j.version}
        
        


        
            mysql
            mysql-connector-java
            ${mysql.version}
        

        
            org.springframework.data
            spring-data-jpa
            1.9.0.RELEASE
        

        
            org.springframework
            spring-test
            5.2.7.RELEASE
        

        
        
            javax.el
            javax.el-api
            2.2.4
        

        
            org.glassfish.web
            javax.el
            2.2.4
        
        
    

然后是在resource文件夹下创建一个applicationContext.xml

然后在对应的com.w.domain下面创建实体类

package com.w.domain;

import javax.persistence.*;

@Entity
@Table(name="cst_customer")
public class Customer {
    //主键
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="cust_id")
    private Long cId;
    //客户名称
    @Column(name="cust_name")
    private String cName;
    //客户来源
    @Column(name="cust_source")
    private String cSource;
    //所属行业
    @Column(name="cust_industry")
    private String cIndustry;
    //等级
    @Column(name="cust_level")
    private String cLevel;
    //地址
    @Column(name="cust_address")
    private String cAddr;
    //电话
    @Column(name="cust_phone")
    private String cPhone;

    public Long getcId() {
        return cId;
    }

    public void setcId(Long cId) {
        this.cId = cId;
    }

    public String getcName() {
        return cName;
    }

    public void setcName(String cName) {
        this.cName = cName;
    }

    public String getcSource() {
        return cSource;
    }

    public void setcSource(String cSource) {
        this.cSource = cSource;
    }

    public String getcIndustry() {
        return cIndustry;
    }

    public void setcIndustry(String cIndustry) {
        this.cIndustry = cIndustry;
    }

    public String getcLevel() {
        return cLevel;
    }

    public void setcLevel(String cLevel) {
        this.cLevel = cLevel;
    }

    public String getcAddr() {
        return cAddr;
    }

    public void setcAddr(String cAddr) {
        this.cAddr = cAddr;
    }

    public String getcPhone() {
        return cPhone;
    }

    public void setcPhone(String cPhone) {
        this.cPhone = cPhone;
    }

    @Override
    public String toString() {
        return "Customer{" +
                "cId=" + cId +
                ", cName='" + cName + '\'' +
                ", cSource='" + cSource + '\'' +
                ", cIndustry='" + cIndustry + '\'' +
                ", cLevel='" + cLevel + '\'' +
                ", cAddr='" + cAddr + '\'' +
                ", cPhone='" + cPhone + '\'' +
                '}';
    }
}

以及实体类对应的sql，在我的上一章节搭建JPA项目中有

接着就是创建对应的Dao接口，需要继承

JpaRepository, JpaSpecificationExecutor两个接口

package com.w.dao;

import com.w.domain.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;

public interface CustomDao extends JpaRepository, JpaSpecificationExecutor {

    @Query(value = "from Customer where cId = ?2 and cName = ?1",nativeQuery = false)
    Customer getCustomerByNameAndId(String name,long id);

    @Query("update Customer set cName=?2 where cId=?1")
    @Modifying
    void updateCustomerById(long id,String name);



    Customer findByCNameLikeAndCAddr(String cName, String cAddr);

    Customer findByCName(String cName);
}

接着编写测试类

package com.w.test;

import com.w.dao.CustomDao;
import com.w.domain.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)
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class TestCRUD {

    @Autowired
    private CustomDao customDao;

    @Test
    public void testFindAll() {
        List customers = customDao.findAll();
        System.out.println(customers);
    }
    @Test
    public void testFindOne() {
        Customer customer = customDao.findOne(1L);
        System.out.println(customer);
    }
    @Test
    public void testSave() {
        Customer customer =new Customer();
        customer.setcName("张三小疯子");
        customer.setcAddr("上海");
         customDao.save(customer);
    }
    @Test
    public void testDelete() {
        customDao.delete(4L);
    }
    @Test
    public void testCount(){
        System.out.println(customDao.count());
    }
    @Test
    public void testExist(){
        //查看是否存在该对象
        System.out.println(customDao.exists(4L));
    }
}

这里面都是一些springData里面有的方法

如果使用JPQL语句进行查询

则还需要添加对应的方法在dao接口中，我已经在里面定义完了，可以照着操作

package com.w.test;

import com.w.dao.CustomDao;
import com.w.domain.Customer;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.annotation.Rollback;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.transaction.annotation.Transactional;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class TestJPQL {
    @Autowired
    private CustomDao customDao;

    @Test
    public void testFindByNameAndId(){
        System.out.println(customDao.getCustomerByNameAndId("张三",1L));
    }
    @Test
    @Transactional
    @Rollback(value = false)
    public void testUpdate(){
        customDao.updateCustomerById(2,"小赵");
    }
}

最后是根据命名规范进行查找

package com.w.test;

import com.w.dao.CustomDao;
import com.w.domain.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;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class TestOthers {
    @Autowired
    private CustomDao customDao;

    @Test
    public void test1(){
        Customer customer = customDao.findByCNameLikeAndCAddr("%张%","上海");
        //Customer customer = customDao.findByCName("%张%");
        System.out.println(customer);
    }
}