一.什麼是SpringDataJpa
- 它是Spring的一個子框架
- 集成Jpa,讓咱們操作數據庫變得更加的簡單
二.項目導包
- 能夠看懂這裏導入了哪些包
- 也可以理解這些包是做什麼的
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cn.itsource</groupId>
<artifactId>aisell</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>aisell Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<org.springframework.version>4.2.5.RELEASE</org.springframework.version>
<org.hibernate.version>4.3.8.Final</org.hibernate.version>
<spring-data-jpa.version>1.9.0.RELEASE</spring-data-jpa.version>
<com.fasterxml.jackson.version>2.5.0</com.fasterxml.jackson.version>
<org.slf4j.version>1.6.1</org.slf4j.version>
</properties>
<dependencies>
<!-- Spring的支持包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<!-- 上下文支持包(幫我們集成:模板,郵件,任務調度...) -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${org.springframework.version}</version>
<scope>test</scope>
</dependency>
<!-- 引入web前端的支持 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<!-- SpringMCV上傳需要用到io包-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-io</artifactId>
<version>1.3.2</version>
</dependency>
<!-- 文件上傳用到的包 -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.2.2</version>
</dependency>
<!-- SpringMVC的json支持包 -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${com.fasterxml.jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${com.fasterxml.jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${com.fasterxml.jackson.version}</version>
</dependency>
<!-- hibernate的支持包 -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${org.hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${org.hibernate.version}</version>
</dependency>
<!-- SpringDataJpa的支持包 -->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>${spring-data-jpa.version}</version>
</dependency>
<!-- SpringData的擴展包 -->
<dependency>
<groupId>com.github.wenhao</groupId>
<artifactId>jpa-spec</artifactId>
<version>3.1.1</version>
<!-- 把所有的依賴都去掉 -->
<exclusions>
<exclusion>
<groupId>*</groupId>
<artifactId>*</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.2.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<!--lang3:工具包 java.lang.-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.5</version>
</dependency>
<!-- 測試包 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<!-- 這個scope 只能作用在編譯和測試時,同時沒有傳遞性。表示在運行的時候不添加此jar文件 -->
<scope>provided</scope>
</dependency>
<!-- 日誌文件 -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${org.slf4j.version}</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
</dependency>
<!-- 代碼生成器模版技術 -->
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity</artifactId>
<version>1.6</version>
</dependency>
<!-- shiro(權限框架)的支持包 -->
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-all</artifactId>
<version>1.4.0</version>
<type>pom</type>
</dependency>
<!-- shiro與Spring的集成包 -->
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-spring</artifactId>
<version>1.4.0</version>
</dependency>
<!-- poi(操作辦公軟件)支持的jar包 -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.11</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.11</version>
</dependency>
<!-- 圖片壓縮功能 -->
<!-- 縮略圖 -->
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.6</version>
</dependency>
<!-- 定時調度 -->
<dependency>
<groupId>quartz</groupId>
<artifactId>quartz</artifactId>
<version>1.5.2</version>
</dependency>
<!-- 郵件支持 -->
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4.1</version>
</dependency>
</dependencies>
<build>
<finalName>aisell</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>8.1.15.v20140411</version>
<configuration>
<stopPort>9966</stopPort>
<stopKey>foo</stopKey>
<webAppConfig>
<contextPath>/</contextPath>
</webAppConfig>
</configuration>
</plugin>
</plugins>
</build>
</project>
三 集成SpringDataJpa
3.1 完成Spring與Jpa的集成
昨天已經詳細講解過(要求自己是可以把它寫出來)
3.1.1 準備jdbc.propeties
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///yxb
jdbc.username=root
jdbc.password=123456
3.2.2 準備applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
">
<!--掃描service層的類-->
<context:component-scan base-package="cn.itsource.aisell.service" />
<!--
db.properties -> dataSource(配置數據源[連接池dbcp]) -> EntityManagerFactory -> dao -> service
-> 事務 -> controller(集成SpringMVC) -> easyui
-->
<!--1.讀取db.properties, 注意:不要忘了加classpath-->
<context:property-placeholder location="classpath:jdbc.properties" />
<!--2.配置dbcp連接池-->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</bean>
<!--
JPA:ORM規範 -> 很多框架實現了這個規範(hibernate,openjpa,toplink,...)
3.配置EntityManagerFactory對象
3.1 基本配置都是寫在Spring中(四大金剛,建表策略,方言,是否顯示SQL)
3.2 Spring來創建這個對象(準備一個domain,如果運行的時候創建了表,就代表這個對象是成功的)
alt+insert -> JPA -> LocalContainerEntityManagerFactoryBean
ctrl+t/f4 : 有辦法看結構
-->
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!--掃描JPA支持的註解-->
<property name="packagesToScan" value="cn.itsource.aisell.domain" />
<!--
告訴Spring我們使用的是哪一個框架來完成JPA規範
這裏就需要我們配置一個適配器
jpaVendorAdapter:JPA需要配置的適配器(我們會選擇hibernate)
-->
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<!--方言-->
<property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect" />
<!--
建表策略(已經有表有數據,不要刪除了)
-->
<property name="generateDdl" value="false" />
<!--是否顯示sql-->
<property name="showSql" value="true" />
</bean>
</property>
</bean>
<!--4.加上事務-->
<!--4.1 準備事務管理器-->
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>
<!--4.2 開啓(註解)事務支持-->
<tx:annotation-driven transaction-manager="transactionManager" />
</beans>
3.2 集成SpringDataJpa
3.2.1 準備domain(父類)
- BaseDomain
jpa中父類domain必需要加上:
@MappedSuperclass
/**
* 泛化:繼承關係
* 在我們JPA,如果要抽取一個父類,就必需加上 @MappedSuperclass
* 非常明確定的告訴JPA,這是一個用於映射的父類
*/
@MappedSuperclass
public class BaseDomain {
@Id
@GeneratedValue
protected Long id;
//getter,setter ...
}
- Employeee
@Entity
@Table(name = "employee")
public class Employee extends BaseDomain {
private String username;
private String password;
private Integer age;
private String email;
//getter,setter ...
}
3.2.2 準備Repository接口
/**
* 關於Employee對象的CRUD(分頁排序) 就寫完了
* 泛型一:對哪一個實體做CRUD
* 泛型二:主鍵的類型
*/
public interface EmployeeRepository extends JpaRepository<Employee,Long> {
...
}
3.2.3 掃描repository
- repository 就是咱們過去的dao
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
...
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
...
http://www.springframework.org/schema/data/jpa
http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
">
...
<!-- 讓SpringDataJpa去掃描repository -->
<jpa:repositories base-package="cn.itsource.aisell.repository"
entity-manager-factory-ref="entityManagerFactory"
transaction-manager-ref="transactionManager" />
</beans>
四.完成的CRUD功能
4.1 基本的CRUD
- 查詢所有:
employeeRepository.findAll()
- 查詢一條數據:
employeeRepository.findOne(1L)
- 思考題: findOne與getOne的區別?
- 添加/修改:
employeeRepository.save(employee)
- 主要看數據庫中是否有這個值
- 刪除 :
employeeRepository.delete(274L)
4.2 分頁和排序
4.2.1 排序
/**
* 排序對象
* 第一個參數:排序的類型(升序還是降序)
* 第二個參數:排序的屬性
*/
Sort sort = new Sort(Sort.Direction.DESC,"age");
List<Employee> list = employeeRepository.findAll(sort);
list.forEach(e-> System.out.println(e));
4.2.2 分頁
注:這裏的分頁是從0開始的
/**
* page:第幾頁(0就是第1頁)
* size:每頁條數
*/
Pageable pageable = new PageRequest(0,10);
//分頁對象
Page<Employee> list = employeeRepository.findAll(pageable);
list.forEach(e-> System.out.println(e));
4.2.3 分頁+排序
Sort sort = new Sort(Sort.Direction.DESC,"age");
/**
* page:第幾頁(0就是第1頁)
* size:每頁條數
* sort:排序對象
*/
Pageable pageable = new PageRequest(0,10,sort);
//分頁對象
Page<Employee> list = employeeRepository.findAll(pageable);
list.forEach(e-> System.out.println(e));