SpringDataJpa实现增删改查分页

一、引入依赖

<properties>
        <spring.version>4.2.4.RELEASE</spring.version>
        <hibernate.version>5.0.7.Final</hibernate.version>
        <slf4j.version>1.6.6</slf4j.version>
        <log4j.version>1.2.12</log4j.version>
        <c3p0.version>0.9.1.2</c3p0.version>
        <mysql.version>5.1.6</mysql.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <!--spring start-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.8</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--spring end-->
        <!--hibernate start-->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>${hibernate.version}</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>${hibernate.version}</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>5.2.1.Final</version>
        </dependency>
        <!--hibernate end-->
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>${c3p0.version}</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-jpa</artifactId>
            <version>1.9.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>javax.el</groupId>
            <artifactId>javax.el-api</artifactId>
            <version>2.2.4</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.web</groupId>
            <artifactId>javax.el</artifactId>
            <version>2.2.4</version>
        </dependency>
    </dependencies>

　　

二、编写配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:jpa="http://www.springframework.org/schema/data/jpa" xmlns:task="http://www.springframework.org/schema/task"
       xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/data/jpa
http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">
   <!--1 dataSource-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"/>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/springdata?characterEncoding=utf-8"/>
        <property name="user" value="root"/>
        <property name="password" value="169695"/>
    </bean>
    <!--2 工厂类对象-->
    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <!--数据源-->
        <property name="dataSource" ref="dataSource"/>
        <property name="packagesToScan" value="cn.zrf.jpa.entity"/>
        <!--配置供应商适配器-->
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="showSql" value="true"/>
                <property name="generateDdl" value="true"/>
                <!--是否向控制台输出语句 update hibernate.hbm2ddl.auto-->
                <property name="database" value="MYSQL"/>
            </bean>
        </property>
    </bean>
    <!--配置事物-->
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="save*" propagation="REQUIRED"/>
            <tx:method name="insert*" propagation="REQUIRED"/>
            <tx:method name="update*" propagation="REQUIRED"/>
            <tx:method name="delete*" propagation="REQUIRED"/>
            <tx:method name="get*" read-only="true"/>
            <tx:method name="find*" read-only="true"/>
            <tx:method name="*" propagation="REQUIRED"></tx:method>
        </tx:attributes>
    </tx:advice>
    <aop:config>
        <aop:pointcut id="pointcut" expression="execution(* cn.zrf.jpa.service.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pointcut"/>
    </aop:config>
    <!--dao-->
    <jpa:repositories base-package="cn.zrf.jpa.dao"
                        transaction-manager-ref="transactionManager"
                        entity-manager-factory-ref="entityManagerFactory"/>
</beans>

　　

三、编写实体类

四、编写dao，继承JpaRepository<Customer,Long>

public interface CustomerDao extends JpaRepository<Customer,Long> {
}

　　

五、测试文件

package cn.zrf.jpa;

import cn.zrf.jpa.dao.CustomerDao;
import cn.zrf.jpa.entity.Customer;
import org.junit.Test;
import org.junit.runner.RunWith;
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.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class TestJpa {
    @Autowired
    CustomerDao customerDao;
    //添加
    @Test
    public void add(){
        for (int i=0;i<10;i++){
            Customer customer = new Customer();
            customer.setCustAddress("北京"+i+"号院");
            customer.setCustName("校长"+i+"号");
            customer.setCustLevel("VIP");
            customerDao.save(customer);
        }
    }
    //删除
    @Test
    public void del(){
        customerDao.delete(2l);
    }
    //更新
    @Test
    public void update(){
        Customer customer = new Customer();
        customer.setCustId(10l);
        customer.setCustAddress("天安门");
        customer.setCustName("张三");
        customer.setCustLevel("一日游");
        customerDao.save(customer);
    }
    //根据ID查询一条
    @Test
    public void findById(){
        Customer one = customerDao.findOne(10l);
        System.out.println(one);
    }
    @Test
    @Transactional// 加上事物注解   在方法执行结束之前   连接不会断
    public  void testGetOne(){
        Customer one = customerDao.getOne(1l);
        System.out.println("-----------------------");
        System.out.println(one);
    }
    //查询所有
    @Test
    public void testFindAll(){
        List<Customer> customerDaoAll = customerDao.findAll();
        for(Customer customer:customerDaoAll){
            System.out.println(customer);
        }
    }
    //分页查询
    @Test
    public void findPage(){
        PageRequest pageRequest = new PageRequest(0, 2);
        Page<Customer> page = customerDao.findAll(pageRequest);
        long totalElements = page.getTotalElements();
        System.out.println("总记录数"+totalElements);
        int totalPages = page.getTotalPages();
        System.out.println("总页码数"+totalPages);
        List<Customer> content = page.getContent();
        for (Customer customer:content){
            System.out.println(customer);
        }
    }
    //查询所有待排序
    @Test
    public void findAllWithSort(){
        //创建一个Sort对象
        //参数1、排序方式  参数2、排序的字段，对应实体类的属性名
        Sort custId = new Sort(Sort.Direction.DESC, "custId");
        List<Customer> list = customerDao.findAll(custId);
        for (Customer customer:list){
            System.out.println(customer);
        }
    }
    //统计数据
    @Test
    public void testCount(){
        long count = customerDao.count();
        System.out.println(count);
    }
    //判断查询数据是否存在
    @Test
    public void testExists(){
        boolean exists = customerDao.exists(2l);
        System.out.println(exists);
    }
}