我最近开始从事 springBoot 项目。 我编写了一个示例程序,从数据库中获取数据,修改它并将其存储回数据库中。
我面临的问题是,我能够从数据库获取数据,但是当将其保存回来时,我收到以下异常。
org.springframework.dao.InvalidDataAccessApiUsageException: no transaction is in progress; nested exception is
javax.persistence.TransactionRequiredException: no transaction is in progress at
org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:413) at
org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:246)
下面是我的代码。 数据配置.java
import java.util.Properties;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.annotation.EnableTransactionManagement;
/**
*
* This class contains code to configure database.
* @author satish
*
*/
@Configuration
@EntityScan(basePackages= {"com.tushar.common.model"})
@ComponentScan(basePackages= {"com.tushar.common.model"})
@EnableJpaRepositories(basePackages={"com"})
@EnableTransactionManagement
public class DataConfiguration {
@Value("${spring.datasource.driver-class-name}")
private String driverClassName;
@Value("${spring.datasource.url}")
private String url;
@Value("${spring.datasource.username}")
private String username;
@Value("${spring.datasource.password}")
private String password;
@Value("${spring.datasource.dialect}")
private String dialect;
/**
*
* It will scan the package where our entities appears.
* @param dataSource
* @return
*/
@Bean
@Autowired
public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {
HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
vendorAdapter.setGenerateDdl(true);
Properties jpaProperties = new Properties();
jpaProperties.setProperty("hibernate.show_sql", "true");
jpaProperties.setProperty("hibernate.dialect", dialect);
jpaProperties.setProperty("hibernate.hbm2ddl.auto", "update");
LocalContainerEntityManagerFactoryBean localContainerEntityManagerFactoryBean =
new LocalContainerEntityManagerFactoryBean();
localContainerEntityManagerFactoryBean.setJpaVendorAdapter(vendorAdapter);
localContainerEntityManagerFactoryBean.setPackagesToScan(new String[] {"com.att.pricerd.discountmanagement.model"});
localContainerEntityManagerFactoryBean.setDataSource(dataSource);
localContainerEntityManagerFactoryBean.setJpaProperties(jpaProperties);
return localContainerEntityManagerFactoryBean;
}
/**
*
* It will set the database properties to the data Source.
* @return
*/
@Bean
public DataSource dataSource(){
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(driverClassName);
dataSource.setUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);
return dataSource;
}
@Bean
@Autowired
public JpaTransactionManager transactionManager(LocalContainerEntityManagerFactoryBean emf) throws Exception {
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(emf.getObject());
transactionManager.setEntityManagerFactory(emf.getNativeEntityManagerFactory());
return transactionManager;
}
}
存储库
@Repository
public interface EmployeeRepository extends JpaRepository<Employee,Long> {
}
DAO 类
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class EmployeeDataManagementDaoImpl implements EmployeeDataManagementDao {
private static final Logger LOG = LoggerFactory.getLogger(EmployeeDataManagementDaoImpl.class);
@Autowired
private EmployeeDataManagmentUtil EmployeeDataManagmentUtil;
@Autowired
private SalesEmployeesRepository salesEmployeesRepository;
@Autowired
private EmployeeRepository employeeRepository;
@PersistenceContext
private EntityManager em;
@Override
public void addEmployee(EmployeeDetailsRequestVo EmployeeRequest) {
convertAndSaveSalesEmployee(EmployeeRequest);
}
/**
* Fetch data from DB, update the inital and maximum Employee and
* save it back to DB.
* @throws DataNotFoundException
*
*/
@Override
public void changeEmployee(List<Employee> Employees) throws EmployeeManagementException {
for (Employee employee : Employees) {
List<Employee> EmployeesDB;
try {
EmployeesDB = getEmployeeFromDB(employee);
} catch (DataNotFoundException e) {
List<String> errorMessage = new ArrayList<>();
errorMessage.add(e.getMessage());
LOG.error(e.getMessage(),e);
throw new EmployeeManagementException(errorMessage);
}
for (Employee employee : EmployeesDB) {
if (employee.getMaxEmployee() != null) {
Employee.setMaxEmployee(employee.getMaxEmployee());
}
if (employee.getInitialEmployee() != null) {
Employee.setInitialEmployee(employee.getInitialEmployee());
}
employeeRepository.saveAndFlush(Employee);
}
}
}
/**
* This method is used to get the Employee details from DB.
*
* @param employee
* @return List<Employee>
* @throws DataNotFoundException
*/
private List<Employee> getEmployeeFromDB(Employee employee)
throws DataNotFoundException {
List<Employee> EmployeesDB = findByAllEmployeesFilters(employee.getempId(),
employee.getyearsExp(), employee.getdeptLevInd(), employee.getsalary(),
employee.getaddress(), employee.getCountryCd(), employee.getpinCode());
if (EmployeesDB.isEmpty()) {
String errCode = ""; // error code for data not found, yet to be
// decided.
LOG.error("ERROR CODE :: {}", errCode);
throw new DataNotFoundException(errCode);
}
return EmployeesDB;
}
/**
* This method will update the end date Employee
* @param List<Employee>
*/
@Override
public void inactivateEmployee(List<Employee> Employees)
throws EmployeeManagementException {
for (Employee employee : Employees) {
List<Employee> employeesDB;
try {
employeesDB = getEmployeeFromDB(employee);
} catch (DataNotFoundException e) {
List<String> errorMessage = new ArrayList<>();
errorMessage.add(e.getMessage());
LOG.error(e.getMessage(),e);
throw new EmployeeManagementException(errorMessage);
}
for (Employee employee : EmployeesDB) {
if (employee.getEmployeeEndDate() != null) {
employee.setEmployeeEndDate(employee.getEmployeeEndDate());
}
//
employeeRepository.saveAndFlush(Employee);
}
}
}
/**
*
* @param empId
* @param yearsExp
* @param bigDecimal
* @param salary
* @param regionId
* @param countryCd
* @param pinCode
* @return
*/
private List<Employee> findByAllEmployeeFilters(BigDecimal empId, BigDecimal yearsExp,
BigDecimal bigDecimal, BigDecimal salary, String regionId, String countryCd, String pinCode) {
CriteriaBuilder criteriaBuilder = em.getCriteriaBuilder();
CriteriaQuery<Employee> criteriaQuery = criteriaBuilder
.createQuery(Employee.class);
Root<Employee> root = criteriaQuery.from(Employee.class);
criteriaQuery.where(criteriaBuilder.equal(root.get("empId"), empId),
criteriaBuilder.equal(root.get("deptLevInd"), bigDecimal),
criteriaBuilder.equal(root.get("yearsExp"), yearsExp), criteriaBuilder.equal(root.get("salary"), salary),
criteriaBuilder.equal(root.get("address"), regionId),
criteriaBuilder.equal(root.get("countryCd"), countryCd),
criteriaBuilder.equal(root.get("pinCode"), pinCode));
return em.createQuery(criteriaQuery).getResultList();
}
}
getEmployeeFromDB
从数据库获取值,但 saveAndFlush 给了我异常(exception)。
最佳答案
实际上 Bedla 是对的,你应该使用 @Transactional。我想添加的是方法changeEmployee应该在Service类中声明。正确的设计是创建EmployeeService
类并将方法changeEmployee
移动到其中,并使用@Transactional注释服务。一般来说,dao 应该只包含从数据库加载的查找方法和用于保存的更新/保存方法。
关于java - Spring Boot应用程序中的事务管理,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47247000/