3-SpringData-事務操作及CRUD

以下內容轉載於

http://www.cnblogs.com/fzng/tag/SpringData/

在此權作爲筆記

Spring事務管理

1. 首先，我們先在Spring配置文件中開啓事務管理

    <!--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"/>

2. 編寫dao層方法

    /**
     * 根據id修改年齡
     * Modifying 該註解表示允許修改
     * @param id
     * @param age
     */
    @Modifying 
    @Query("update Employee o set o.age=:age where o.id = :id")
    public void update(@Param("id")Integer id, @Param("age")Integer age);

3. 編寫Service層代碼

import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.wzw.springdata.dao.EmployeeRepository2;
import com.wzw.springdata.dao.EmployeeRepository3;
import com.wzw.springdata.model.Employee;

@Service
public class EmployeeService {

    @Autowired
    private EmployeeRepository2 er2;

    @Transactional
    public void update(Integer id, Integer age) {
        er2.update(id, age);
    }
}

4. 編寫測試代碼

    @Test
    public void fun8() {
        System.out.println("1: " + es);
        es.update(2, 25);
    }

5. @Modifying

@Modifying 
@Query("update Employee o set o.age=:age where o.id = :id")

@Modifying註解表示可以修改

SpringData的CRUD

1. 創建CrudRepository接口的子接口

import org.springframework.data.repository.CrudRepository;
import com.wzw.springdata.model.Employee;

public interface EmployeeRepository3 extends CrudRepository<Employee, Integer>{

}

2. 編寫service層方法

import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.wzw.springdata.dao.EmployeeRepository2;
import com.wzw.springdata.dao.EmployeeRepository3;
import com.wzw.springdata.model.Employee;

@Service
public class EmployeeService {

    @Autowired
    private EmployeeRepository3 er3;

    @Transactional
    public void save() {
        Employee employee = new Employee();
        employee.setName("test"+new SimpleDateFormat("yyyy").format(new Date()).toString());
        employee.setAge(20);
        er3.save(employee);
    }
}

3. 編寫測試方法

    @Test
    public void fun9() {
        System.out.println("1: " + es);
        es.save();
    }

4. CrudRepository的主要方法

long count();   
boolean exists(Integer arg0);  

<S extends StudentPO> S save(S arg0);  
<S extends StudentPO> Iterable<S> save(Iterable<S> arg0);  

void delete(Integer arg0);  
void delete(Iterable<? extends StudentPO> arg0);  
void delete(StudentPO arg0);  
void deleteAll();  

StudentPO findOne(Integer arg0);  
Iterable<StudentPO> findAll();  
Iterable<StudentPO> findAll(Iterable<Integer> arg0);