Spring-data-Jpa項目搭建
阿新 • • 發佈:2018-07-19
tex show pla adapter format manage strategy print table
傳送門:Spring Data 學習 Spring Data 開發環境搭建
簡介
Spring Data是什麽
Spring Data是一個用於簡化數據庫訪問,並支持雲服務的開源框架。其主要目標是使得對數據的訪問變得方便快捷Spring Data JPA能幹什麽
可以極大的簡化JPA的寫法,可以在幾乎不用寫實現的情況下,實現對數據的訪問和操作。除了CRUD外,還包括如分頁、排序等一些常用的功能。
Spring Data JPA 有什麽 主要來看看Spring Data JPA提供的接口,也是Spring Data JPA的核心概念: 1:Repository:最頂層的接口,是一個空的接口,目的是為了統一所有Repository的類型,且能讓組件掃描的時候自動識別。 2:CrudRepository :是Repository的子接口,提供CRUD的功能 3:PagingAndSortingRepository:是CrudRepository的子接口,添加分頁和排序的功能 4:JpaRepository:是PagingAndSortingRepository的子接口,增加了一些實用的功能,比如:批量操作等。 5:JpaSpecificationExecutor:用來做負責查詢的接口 6:Specification:是Spring Data JPA提供的一個查詢規範,要做復雜的查詢,只需圍繞這個規範來設置查詢條件即可特征
- 強大的存儲庫和自定義對象映射抽象
- 從存儲庫方法名稱中進行動態查詢導出
- 實現域基類提供基本屬性
- 支持透明審核(創建,最後更改)
- 集成自定義存儲庫代碼的可能性
- Easy Spring通過JavaConfig和自定義XML命名空間進行集成
- 與Spring MVC控制器進行高級集成
- 跨店存儲的實驗支持
搭建過程
1.配置xml
<?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:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jpa="http://www.springframework.org/schema/data/jpa" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd"default-lazy-init="true"> <description>Spring公共配置</description> <!--數據庫連接--> <context:property-placeholder location="classpath:/config/jdbc.properties"/> <!--掃描service包--> <context:component-scan base-package="com.wang.service"/> <!-- Jpa Entity Manager 配置 --> <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="jpaVendorAdapter" ref="hibernateJpaVendorAdapter"/> <property name="packagesToScan" value="com.wang.entity"/> <property name="jpaProperties"> <props> <!-- 命名規則 My_NAME->MyName --> <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop> <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.format_sql">true</prop> <prop key="hibernate.hbm2ddl.auto">update</prop> </props> </property> <property name="jpaDialect"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"/> </property> </bean> <bean id="hibernateJpaVendorAdapter" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/> <!-- Spring Data Jpa配置 --> <jpa:repositories base-package="com.wang.reposity" transaction-manager-ref="transactionManager" entity-manager-factory-ref="entityManagerFactory"/> <!-- Jpa 事務配置 --> <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory"/> </bean> <!-- 使用annotation定義事務 --> <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource"/> </bean> <!-- 數據源配置, 使用Tomcat JDBC連接池 --> <bean id="dataSource" class="org.apache.tomcat.jdbc.pool.DataSource" destroy-method="close"> <!-- Connection Info --> <property name="driverClassName" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> <!-- Connection Pooling Info --> <property name="maxActive" value="${jdbc.pool.maxActive}"/> <property name="maxIdle" value="${jdbc.pool.maxIdle}"/> <property name="minIdle" value="0"/> <property name="defaultAutoCommit" value="true"/> </bean> </beans>
2.創建一個實體類
package com.wang.entity; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.Table; import java.util.Date; @Entity @Table(name="jpa_persons") public class Person { private Integer id; private String lastName; private String email; private Date birth; public Person(){} @GeneratedValue // 按照數據庫默認的方式進行自增 @Id public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public Date getBirth() { return birth; } public void setBirth(Date birth) { this.birth = birth; } @Override public String toString() { return "Person{" + "id=" + id + ", lastName=‘" + lastName + ‘\‘‘ + ", email=‘" + email + ‘\‘‘ + ", birth=" + birth + ‘}‘; } }
3.編寫Reposity接口類
package com.wang.reposity; import com.wang.entity.Person; import org.springframework.data.repository.Repository; /** * 操作person類的接口 * 需要繼承自Repository * 參1: 代表當前操作的實體類 * 參2: 代表實體類的主鍵類型 * @author dell * *Repository是springdata的核心接口,這個接口的實現規定了spring data操作數據庫的規範--命名規範 *查詢是以get或者是find或者是read開頭 */ public interface PersonRepository extends Repository<Person, Integer> { Person getByLastName(String lastName); }
4.測試
package com.wang.reposity; import com.wang.entity.Person; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class TestSpringData { private ApplicationContext context; private PersonRepository personRepository; @org.junit.Before //該註解含義在執行@Test註解之前先執行這個代碼 public void Before(){ context=new ClassPathXmlApplicationContext("/spring/spring-context.xml"); personRepository=context.getBean(PersonRepository.class); System.out.println("測試前"); } @Test public void testHellord(){ Person person = personRepository.getByLastName("wang"); System.out.println(person); } }
Spring-data-Jpa項目搭建