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Jpa实现数据库的CRUD

时间:2019-08-21 00:16:53      阅读:140      评论:0      收藏:0      [点我收藏+]

标签:log4j   整合   gen   junit   除了   add   适配器   compile   ssi   

1....创建步骤:练习使用

    1... 创建 maven工程 

    2...添加依赖  mysql   c3p0 hibernate  springDataJpa   spring相关的包

    3...创建 配置文件          员(数据源)工(工程类对象)是(事物)爹(dao 扫描器)

    4... 创建实体类  

    5... 创建dao 接口  继承 JapRespository

2....五种查询方式

(1) crud

    添加/修改 数据 save 方法

?     删除数据 delete 方法

?     查询 :findOne.  getOne 方法

    ? 查询全部 findAll() 方法

?     findAll(Pageable pageaable) 返回Page对象 进行分页  排序

(2) 在springDataJpa框架使用Jpql 查询 

    a: 在dao 接口中定义一个方法 使用方法的参数设置jpql的参数 并且使用方法的返回值接受查询的结果

?     b: 在方法上添加一个注解Qquery

?     c 在注解中编写jpql

?     d 测试

(3)使用原生的Sql语句

    1 dao中 定义一个方法

?     2 在方法中添加@Query注解

?     3 在注解中 添加 原生的sql 语句 添加一个属性 nativeQuery=true

?     4 测试

(4)方法命名规则查询

      通过一定的规则 定义一个方法 框架本省就可以根据方法名生成一个SQL语句进行查询

  ? 规则:

?     1 使用findBy开头

?     2 查询某个字段 findBy后跟实体类的属性的名称

?     3 如果有多个条件 就在方法后加And+实体类的属性名

?     4 方法的参数 对应查询的定义

?     5 返回值根据返回的数据类型定义

    如果需要分页查询 在方法中添加一个参数Pageable 即可

5)使用Specification方式进行查询

       最强大的查询方式 除了原生的SQL 语句以外 最复杂的查询方式

   使用方式:

?     1 要在dao 继承JpaSeciFicationExection 接口

?     2 使用JpaSeciFicationExection 接口 中提供的方法进行查询

?     每个方法都需要使用Specification对象作为参数

 

具体实现:::

1...pom.xml 配置

技术图片
  1 <?xml version="1.0" encoding="UTF-8"?>
  2 <project xmlns="http://maven.apache.org/POM/4.0.0"
  3          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5     <modelVersion>4.0.0</modelVersion>
  6 
  7     <groupId>com.wsc</groupId>
  8     <artifactId>springdatalpa01</artifactId>
  9     <version>1.0-SNAPSHOT</version>
 10 
 11 
 12     <properties>
 13         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 14         <maven.compiler.source>1.8</maven.compiler.source>
 15         <maven.compiler.target>1.8</maven.compiler.target>
 16         <spring.version>4.2.4.RELEASE</spring.version>
 17         <hibernate.version>5.0.7.Final</hibernate.version>
 18         <slf4j.version>1.6.6</slf4j.version>
 19         <log4j.version>1.2.12</log4j.version>
 20         <c3p0.version>0.9.1.2</c3p0.version>
 21         <mysql.version>5.1.6</mysql.version>
 22     </properties>
 23     <dependencies>
 24         <dependency>
 25             <groupId>junit</groupId>
 26             <artifactId>junit</artifactId>
 27             <version>4.12</version>
 28             <scope>test</scope>
 29         </dependency>
 30         <!--spring start-->
 31         <dependency>
 32             <groupId>org.aspectj</groupId>
 33             <artifactId>aspectjweaver</artifactId>
 34             <version>1.6.8</version>
 35         </dependency>
 36         <dependency>
 37             <groupId>org.springframework</groupId>
 38             <artifactId>spring-aop</artifactId>
 39             <version>${spring.version}</version>
 40         </dependency>
 41         <dependency>
 42             <groupId>org.springframework</groupId>
 43             <artifactId>spring-context</artifactId>
 44             <version>${spring.version}</version>
 45         </dependency>
 46         <dependency>
 47             <groupId>org.springframework</groupId>
 48             <artifactId>spring-context-support</artifactId>
 49             <version>${spring.version}</version>
 50         </dependency>
 51         <dependency>
 52             <groupId>org.springframework</groupId>
 53             <artifactId>spring-orm</artifactId>
 54             <version>${spring.version}</version>
 55         </dependency>
 56         <dependency>
 57             <groupId>org.springframework</groupId>
 58             <artifactId>spring-beans</artifactId>
 59             <version>${spring.version}</version>
 60         </dependency>
 61         <dependency>
 62             <groupId>org.springframework</groupId>
 63             <artifactId>spring-core</artifactId>
 64             <version>${spring.version}</version>
 65         </dependency>
 66         <!--spring end-->
 67         <!--hibernate start-->
 68         <dependency>
 69             <groupId>org.hibernate</groupId>
 70             <artifactId>hibernate-core</artifactId>
 71             <version>${hibernate.version}</version>
 72         </dependency>
 73         <dependency>
 74             <groupId>org.hibernate</groupId>
 75             <artifactId>hibernate-entitymanager</artifactId>
 76             <version>${hibernate.version}</version>
 77         </dependency>
 78         <dependency>
 79             <groupId>org.hibernate</groupId>
 80             <artifactId>hibernate-validator</artifactId>
 81             <version>5.2.1.Final</version>
 82         </dependency>
 83         <!--hibernate end-->
 84         <dependency>
 85             <groupId>c3p0</groupId>
 86             <artifactId>c3p0</artifactId>
 87             <version>${c3p0.version}</version>
 88         </dependency>
 89         <dependency>
 90             <groupId>log4j</groupId>
 91             <artifactId>log4j</artifactId>
 92             <version>${log4j.version}</version>
 93         </dependency>
 94         <dependency>
 95             <groupId>org.slf4j</groupId>
 96             <artifactId>slf4j-api</artifactId>
 97             <version>${slf4j.version}</version>
 98         </dependency>
 99         <dependency>
100             <groupId>org.slf4j</groupId>
101             <artifactId>slf4j-log4j12</artifactId>
102             <version>${slf4j.version}</version>
103         </dependency>
104         <dependency>
105             <groupId>mysql</groupId>
106             <artifactId>mysql-connector-java</artifactId>
107             <version>${mysql.version}</version>
108         </dependency>
109         <dependency>
110             <groupId>org.springframework.data</groupId>
111             <artifactId>spring-data-jpa</artifactId>
112             <version>1.9.0.RELEASE</version>
113         </dependency>
114         <dependency>
115             <groupId>org.springframework</groupId>
116             <artifactId>spring-test</artifactId>
117             <version>4.2.4.RELEASE</version>
118         </dependency>
119         <dependency>
120             <groupId>javax.el</groupId>
121             <artifactId>javax.el-api</artifactId>
122             <version>2.2.4</version>
123         </dependency>
124         <dependency>
125             <groupId>org.glassfish.web</groupId>
126             <artifactId>javax.el</artifactId>
127             <version>2.2.4</version>
128         </dependency>
129     </dependencies>
130 </project>
pom.xml

2...applicationContext.xml

技术图片
 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
 4        xmlns:context="http://www.springframework.org/schema/context"
 5        xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:tx="http://www.springframework.org/schema/tx"
 6        xmlns:jpa="http://www.springframework.org/schema/data/jpa" xmlns:task="http://www.springframework.org/schema/task"
 7        xsi:schemaLocation="
 8 http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 9 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
10 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
11 http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
12 http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
13 http://www.springframework.org/schema/data/jpa
14 http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">
15     <!--1 dataSource-->
16     <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
17         <property name="password" value="wsc"></property>
18         <property name="user" value="root"></property>
19         <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/shop?characterEncoding=utf-8"></property>
20         <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
21     </bean>
22     <!--2 工厂类对象-->
23     <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
24         <!--数据源-->
25         <property name="dataSource" ref="dataSource"></property>
26         <property name="packagesToScan" value="com.wsc.core.entity"></property>
27         <!--配置供应商适配器-->
28         <property name="jpaVendorAdapter">
29             <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
30                  <property name="showSql" value="true"></property>
31                  <property name="generateDdl" value="true"></property>
32                 <!--是否向控制台输出语句 update hibernate.hbm2ddl.auto-->
33                 <property name="database" value="MYSQL"></property>
34             </bean>
35         </property>
36     </bean>
37     <!--配置事物-->
38     <bean id="jpaTransactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
39         <property name="entityManagerFactory" ref="entityManagerFactory"></property>
40     </bean>
41     <tx:advice id="txAdvice" transaction-manager="jpaTransactionManager">
42         <tx:attributes>
43             <tx:method name="save*" propagation="REQUIRED"/>
44             <tx:method name="insert*" propagation="REQUIRED"/>
45             <tx:method name="update*" propagation="REQUIRED"/>
46             <tx:method name="delete*" propagation="REQUIRED"/>
47             <tx:method name="get*" read-only="true"/>
48             <tx:method name="find*" read-only="true"/>
49             <tx:method name="*" propagation="REQUIRED"/>
50         </tx:attributes>
51     </tx:advice>
52     <aop:config>
53         <aop:pointcut id="pointcut" expression="execution(* com.wsc.core.service.*.*(..)) "/>
54         <aop:advisor advice-ref="txAdvice" pointcut-ref="pointcut"></aop:advisor>
55     </aop:config>
56     <!--dao-->
57     <jpa:repositories base-package="com.wsc.core.dao"
58     transaction-manager-ref="jpaTransactionManager"
59     entity-manager-factory-ref="entityManagerFactory">
60     </jpa:repositories>
61 </beans>
applicationContext.xml

3.....实体类

技术图片
 1 package com.wsc.core.entity;
 2 
 3 import javax.persistence.*;
 4 
 5 /**
 6  * @version 1.0
 7  * @ClassName Account
 8  * @Description TODO
 9  * @Author WSC
10  * @Date 2019/8/16 11:31
11  **/
12 @Entity
13 @Table(name="ac_account")
14 public class Account {
15     @GeneratedValue(strategy= GenerationType.IDENTITY)
16     @Id
17     @Column(name="ac_id")
18     private int acId;
19     @Column(name="ac_address")
20     private String acAddress;
21     @Column(name="ac_name")
22     private String acName;
23     @Column(name="ac_age")
24     private int acAge;
25 
26     public int getAcId() {
27         return acId;
28     }
29 
30     public void setAcId(int acId) {
31         this.acId = acId;
32     }
33 
34     public String getAcAddress() {
35         return acAddress;
36     }
37 
38     public void setAcAddress(String acAddress) {
39         this.acAddress = acAddress;
40     }
41 
42     public String getAcName() {
43         return acName;
44     }
45 
46     public void setAcName(String acName) {
47         this.acName = acName;
48     }
49 
50     public int getAcAge() {
51         return acAge;
52     }
53 
54     public void setAcAge(int acAge) {
55         this.acAge = acAge;
56     }
57 
58     @Override
59     public String toString() {
60         return "Account{" +
61                 "acId=" + acId +
62                 ", acAddress=‘" + acAddress + ‘\‘‘ +
63                 ", acName=‘" + acName + ‘\‘‘ +
64                 ", acAge=" + acAge +
65                 ‘}‘;
66     }
67 }
实体类

4....dao

技术图片
 1 package com.wsc.core.dao;
 2 
 3 import com.wsc.core.entity.Account;
 4 import org.springframework.data.domain.Page;
 5 import org.springframework.data.domain.Pageable;
 6 import org.springframework.data.jpa.repository.JpaRepository;
 7 import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
 8 import org.springframework.data.jpa.repository.Modifying;
 9 import org.springframework.data.jpa.repository.Query;
10 import org.springframework.transaction.annotation.Transactional;
11 
12 import java.util.List;
13 
14 //实现JpaRepository接口
15 public interface AccountDao extends JpaRepository<Account,Integer>, JpaSpecificationExecutor<Account> {
16     /**
17      * 查询全部
18      * @return
19      */
20     @Query("from Account ")
21     public List<Account> getFindAll();
22     /**
23      * 查询全部  分页
24      * @return
25      * @param pageable
26      */
27     @Query("from Account ")
28     public List<Account> getFindAllByPage(Pageable pageable);
29     /**
30      * 根据id查询
31      */
32     @Query("from Account where ac_id=?1")
33     public Account getFindById(Long ac_id);
34 
35     /**
36      *
37      * 模糊查询
38      */
39     @Query("from Account where acName like ?1 and acAddress like ?2")
40     public List<Account> findByName(String acName,String acAddress);
41 
42     /**
43      *  修改数据
44      */
45     @Modifying
46     @Transactional
47     @Query("update Account set acName=?1 where acId=?2")
48     public void change(String acName,Integer acId);
49 
50    // 原生SQL 语句查询
51     /**
52      * 原生SQL 语句查询
53      */
54     @Query(value = "select  * from ac_account WHERE ac_name LIKE ?" ,nativeQuery = true)
55     public List<Account> getAccount(String name);
56 
57     //方法命名规则查询
58     /**
59      *  根据id查询
60      */
61     public Account findAccountByAcId(Integer id);
62 
63     /**
64      *  模糊查询
65      * @param address
66      * @param name
67      * @return
68      */
69     public List<Account> findByAcAddressLikeAndAcNameLike(String address,String name);
70 
71     /**
72      * 分页查询
73      * @param name
74      * @param pageable
75      * @return
76      */
77     public Page<Account> findByAcNameLike(String name,Pageable pageable);
78 
79 
80  }
dao

5.....test

 test 01

    (delete

      save

    findOne

    count

    getOne

      分页 

    排序   

    判断是否存在)

技术图片
  1 package com.wsc.core.test;
  2 
  3 import com.wsc.core.dao.AccountDao;
  4 import com.wsc.core.entity.Account;
  5 import org.junit.Test;
  6 import org.junit.runner.RunWith;
  7 import org.springframework.beans.factory.annotation.Autowired;
  8 import org.springframework.data.domain.Page;
  9 import org.springframework.data.domain.PageRequest;
 10 import org.springframework.data.domain.Sort;
 11 import org.springframework.test.context.ContextConfiguration;
 12 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 13 import org.springframework.transaction.annotation.Transactional;
 14 
 15 import java.util.List;
 16 
 17 /**
 18  * @version 1.0
 19  * @ClassName TestJPA
 20  * @Description TODO
 21  * @Author WSC
 22  * @Date 2019/8/16 13:12
 23  **/
 24 @RunWith(SpringJUnit4ClassRunner.class)
 25 @ContextConfiguration("classpath:applicationContext.xml")
 26 public class TestJPA {
 27     @Autowired
 28     private AccountDao accountDao;
 29     /**
 30      * 添加数据
 31      */
 32     @Test
 33     public void test01(){
 34 //        ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
 35 //        AccountDao accountDao = applicationContext.getBean(AccountDao.class);
 36         Account account = new Account();
 37         account.setAcAddress("提阿女号");
 38         account.setAcAge(133);
 39         account.setAcName("zhang");
 40         this.accountDao.save(account);
 41     }
 42     /**
 43      * 删除数据
 44      */
 45     @Test
 46     public void test02(){
 47         accountDao.delete(22);
 48     }
 49     /**
 50      * 修改数据
 51      */
 52     @Test
 53     public void test03(){
 54         Account account = accountDao.findOne(23);
 55         account.setAcName("阿凡提123");
 56         account.setAcAddress("美丽的郑州");
 57         accountDao.save(account);
 58     }
 59     /**
 60      * 查询单个数据  findOne 方法
 61      */
 62     @Test
 63     public void test04(){
 64         Account one = accountDao.findOne(23);
 65         System.out.println(one);
 66     }
 67     /**
 68      * 查询数据的总个数 count 方法
 69      */
 70     @Test
 71     public void getCount(){
 72         long count = accountDao.count();
 73         System.out.println(count);
 74     }
 75     /**
 76      * 获得数据单个
 77      * 必须加注解   @Transactional 事务注解
 78      *  不加报错:could not initialize proxy - no Session
 79      */
 80     @Test
 81     @Transactional
 82     public void getFindOne(){
 83         Account one = accountDao.getOne(23);
 84         System.out.println(one);
 85     }
 86     /**
 87      * 分页功能
 88      */
 89     @Test
 90     public void testPage(){
 91         PageRequest pageRequest = new PageRequest(0, 5);
 92         Page<Account> accountPage = accountDao.findAll(pageRequest);
 93         //总的数据条数
 94         long totalElements = accountPage.getTotalElements();
 95         System.out.println(totalElements);
 96         //总的页数
 97         int totalPages = accountPage.getTotalPages();
 98         System.out.println(totalPages);
 99         //遍历数据
100       for(Account account:accountPage){
101           System.out.println(account);
102       }
103         List<Account> accountList = accountPage.getContent();
104         System.out.println(accountList);
105     }
106     /**
107      * 排序 Sort.Direction.DESC 降序
108      */
109     @Test
110     public void testSort(){
111         // 创建一个sort  对象
112         //  参数1  排序方式
113         // 参数2  排序的字段  应该是实体类的属性名
114         Sort sort = new Sort(Sort.Direction.DESC,"acId");
115         List<Account> accountList = accountDao.findAll(sort);
116         for(Account account:accountList)
117              System.out.println(account);
118     }
119     /**
120      * 判断 是否 存在 exists
121      */
122     @Test
123     public void testExists(){
124         boolean exists = accountDao.exists(1);
125         System.out.println(exists);
126     }
127 }
test01

  test02

  (  全部信息

     根据id查 

  分页 

   模糊查询 原生SQL    

  方 法命名规则查询
  模糊查询  方 法命名规则查询
  根据 名字 模糊查询 并 分页)
技术图片
  1 package com.wsc.core.test;
  2 
  3 import com.wsc.core.dao.AccountDao;
  4 import com.wsc.core.entity.Account;
  5 import org.junit.Test;
  6 import org.junit.runner.RunWith;
  7 import org.springframework.beans.factory.annotation.Autowired;
  8 import org.springframework.data.domain.Page;
  9 import org.springframework.data.domain.PageRequest;
 10 import org.springframework.test.context.ContextConfiguration;
 11 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 12 
 13 import java.util.List;
 14 
 15 /**
 16  * @version 1.0
 17  * @ClassName Test02
 18  * @Description TODO
 19  * @Author WSC
 20  * @Date 2019/8/19 14:32
 21  **/
 22 @RunWith(SpringJUnit4ClassRunner.class)
 23 @ContextConfiguration("classpath:applicationContext.xml")
 24 public class Test02 {
 25     @Autowired
 26     private AccountDao accountDao;
 27 
 28     /**
 29      * 全部信息
 30      */
 31     @Test
 32     public void testFindAll() {
 33         List<Account> findAll = accountDao.getFindAll();
 34         for (Account account : findAll) {
 35             System.out.println(account);
 36         }
 37     }
 38 
 39     /**
 40      * id  信息
 41      */
 42     @Test
 43     public void getById() {
 44         Account findById = accountDao.getFindById(3L);
 45         System.out.println(findById);
 46     }
 47 
 48     /**
 49      * 查询全部  分页
 50      */
 51     @Test
 52     public void getByPage() {
 53         // 参数 1:页面开始  2: 页面数据条数
 54         PageRequest pageRequest = new PageRequest(0, 5);
 55         List<Account> findAllByPage = accountDao.getFindAllByPage(pageRequest);
 56         for (Account account:findAllByPage) {
 57             System.out.println(account);
 58         }
 59     }
 60 
 61     /**
 62      * 模糊查询
 63      */
 64     @Test
 65     public void get02(){
 66         List<Account> byName = accountDao.findByName("%2%", "%中%");
 67         for(Account account:byName){
 68             System.out.println(account);
 69         }
 70     }
 71     @Test
 72     public void change(){
 73         accountDao.change("滚",3);
 74     }
 75 
 76     /**
 77      * 原生SQL 语句查询
 78      */
 79     @Test
 80     public void get01(){
 81         List<Account> account = accountDao.getAccount("%2%");
 82         for(Account acc: account){
 83             System.out.println(acc);
 84         }
 85     }
 86 
 87     /**
 88      *  方 法命名规则查询
 89      */
 90     @Test
 91     public void get03(){
 92         Account accountByAcId = accountDao.findAccountByAcId(3);
 93         System.out.println(accountByAcId);
 94     }
 95 
 96     /**
 97      * 模糊查询  方 法命名规则查询
 98      */
 99     @Test
100     public void get04(){
101         List<Account> byAcAddressAndAcName = accountDao.findByAcAddressLikeAndAcNameLike("%中%", "%2%");
102         for(Account account:byAcAddressAndAcName){
103             System.out.println(account);
104         }
105     }
106 
107     /**
108      * 根据 名字 模糊查询 并 分页
109      */
110     @Test
111     public void get05(){
112         Page<Account> byAcNameLike = accountDao.findByAcNameLike("%2%", new PageRequest(0, 2));
113         long totalElements = byAcNameLike.getTotalElements();
114         System.out.println(totalElements+"总的条数");
115         int totalPages = byAcNameLike.getTotalPages();
116         System.out.println(totalPages+"总的页数");
117         List<Account> content = byAcNameLike.getContent();
118         for(Account account:content){
119             System.out.println(account);
120         }
121     }
122 }
test02

  test03   

  (使用Specification方式进行查询)

技术图片
 1 package com.wsc.core.test;
 2 
 3 import com.wsc.core.dao.AccountDao;
 4 import com.wsc.core.entity.Account;
 5 import org.junit.Test;
 6 import org.junit.runner.RunWith;
 7 import org.springframework.beans.factory.annotation.Autowired;
 8 import org.springframework.data.domain.Page;
 9 import org.springframework.data.domain.PageRequest;
10 import org.springframework.data.jpa.domain.Specification;
11 import org.springframework.test.context.ContextConfiguration;
12 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
13 
14 import javax.persistence.criteria.CriteriaBuilder;
15 import javax.persistence.criteria.CriteriaQuery;
16 import javax.persistence.criteria.Predicate;
17 import javax.persistence.criteria.Root;
18 import java.util.List;
19 
20 /**
21  * @version 1.0
22  * @ClassName test03
23  * @Description TODO
24  * @Author WSC
25  * @Date 2019/8/19 16:55
26  **/
27 
28 // 测试 使用 Specification 方式进行查询
29 
30 @RunWith(SpringJUnit4ClassRunner.class)
31 @ContextConfiguration("classpath:applicationContext.xml")
32 public class test03 {
33     @Autowired
34     private AccountDao accountDao;
35 
36     /**
37      *  使用 Specification 方式
38      *  根据 id 查询
39      */
40     @Test
41     public void test01(){
42         Account account=accountDao.findOne(new Specification<Account>() {
43             @Override
44             public Predicate toPredicate(Root<Account> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
45                 //  参数1  字段名称
46                 // 参数2    字段的值
47                 Predicate acId = cb.equal(root.get("acId"), 3);
48                 return acId;
49             }
50         });
51         System.out.println(account);
52     }
53 
54     /**
55      *  多字段 模糊查询 并 整合
56      */
57     @Test
58     public void get02(){
59         accountDao.findAll(new Specification<Account>() {
60             @Override
61             public Predicate toPredicate(Root<Account> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
62                 // 创建 根据模糊查询的条件
63                 Predicate acName = cb.like(root.get("acName"), "%2%");
64                 Predicate acAddress = cb.like(root.get("acAddress"), "%中%");
65                 // 组合两个条件
66                 Predicate predicate = cb.and(acName, acAddress);
67                 return predicate;
68             }
69         }).forEach(c->System.out.println(c));//打印功能
70     }
71 
72     /**
73      *  多字段 模糊查询 并 整合 并 分页
74      */
75     @Test
76     public void get03(){
77        Page<Account> byAcNameLike= accountDao.findAll(new Specification<Account>() {
78             @Override
79             public Predicate toPredicate(Root<Account> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
80                 // 创建 根据模糊查询的条件
81                 Predicate acName = cb.like(root.get("acName"), "%2%");
82                 Predicate acAddress = cb.like(root.get("acAddress"), "%中%");
83                 // 组合两个条件
84                 Predicate predicate = cb.and(acName, acAddress);
85                 return predicate;
86             }
87         },new PageRequest(0,3));
88         long totalElements = byAcNameLike.getTotalElements();
89         System.out.println(totalElements+"总的条数");
90         int totalPages = byAcNameLike.getTotalPages();
91         System.out.println(totalPages+"总的页数");
92         List<Account> content = byAcNameLike.getContent();
93         for(Account account:content){
94             System.out.println(account);
95         }
96     }
97 }
test03

 

Jpa实现数据库的CRUD

标签:log4j   整合   gen   junit   除了   add   适配器   compile   ssi   

原文地址:https://www.cnblogs.com/wangshichang/p/11386157.html

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