SpringData入門筆記(三) - SpringData初嚐鮮

目標

用sring data方式建立一張employee表，包含id/name/age字段，id自增，name長度20，name/age不能爲空。

建立一個經過name查詢employee的方法，並測試之。

項目結構

Maven依賴

<dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.38</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.data</groupId>
      <artifactId>spring-data-jpa</artifactId>
      <version>1.8.0.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-entitymanager</artifactId>
      <version>4.3.6.Final</version>
    </dependency>

代碼編寫

創建對象模型

Employee.java

package com.dotleo.entity;


import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

/**
 * 僱員 : 先開發實體類 ---> 自動生成數據庫
 * @author LiuFei
 * @create 2017-11-06 21:23
 */
@Entity
public class Employee {

    @GeneratedValue
    @Id
    private Integer id;

    @Column(length = 20 ,nullable = false)
    private String name;

    @Column(nullable = false)
    private Integer age;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Employee{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

spring配置文件 - beans.xml 建立

此文件爲最終版，可能因爲部分類還沒建立報錯，暫時不用管

beans.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.xsd
	    http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

    <!-- 1.配置數據源 -->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/spring_data?useSSL=true" />
        <property name="username" value="root" />
        <property name="password" value="liufei" />
    </bean>

    <!--2 配置EntityManagerFactory-->
    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
        </property>
        <property name="packagesToScan" value="com.dotleo"/>

        <property name="jpaProperties">
            <props>
                <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>

    </bean>

    <!--3 配置事務管理器-->
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>

    <!--4 配置支持註解的事務-->
    <tx:annotation-driven transaction-manager="transactionManager"/>

    <!--5 配置spring data-->
    <jpa:repositories base-package="com.dotleo" entity-manager-factory-ref="entityManagerFactory"/>

    <context:component-scan base-package="com.dotleo"/>
</beans>

EmployeeRepository接口建立

package com.dotleo.repository;

import com.dotleo.entity.Employee;
import org.springframework.data.repository.Repository;

/**
 * @author LiuFei
 * @create 2017-11-06 22:44
 */
public interface EmployeeRepository extends Repository<Employee, Integer>{

    public Employee findByName(String name);
}

測試類建立

package com.dotleo.repository;

import com.dotleo.entity.Employee;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @author LiuFei
 * @create 2017-11-06 22:48
 */
public class EmployeeRepositoryTest {

    ApplicationContext ctx = null;
    EmployeeRepository employeeRepository = null;

    @Before
    public void setup() {
        ctx = new ClassPathXmlApplicationContext("beans.xml");
        employeeRepository = ctx.getBean(EmployeeRepository.class);
    }

    @After
    public void tearDown() {
        ctx = null;
    }

    @Test
    public void testFindByName() {
        Employee employee = employeeRepository.findByName("zhangsan");
        if (employee != null) {
            System.out.println(employee.toString());
        }
    }

}