Question

我是春天的初学者，在我的基于控制台的项目中，我正在使用带有hibernate的spring.I在大约一天内遇到了以下错误。

Exception in thread "main" org.springframework.dao.InvalidDataAccessApiUsageException: Write operations are not allowed in read-only mode (FlushMode.MANUAL): Turn your Session into FlushMode.COMMIT/AUTO or remove 'readOnly' marker from transaction definition.
at org.springframework.orm.hibernate5.HibernateTemplate.checkWriteOperationAllowed(HibernateTemplate.java:1126)
at org.springframework.orm.hibernate5.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:619)
at org.springframework.orm.hibernate5.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:616)
at org.springframework.orm.hibernate5.HibernateTemplate.doExecute(HibernateTemplate.java:341)
at org.springframework.orm.hibernate5.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:309)
at org.springframework.orm.hibernate5.HibernateTemplate.save(HibernateTemplate.java:616)
at com.hbtemp.dao.impl.StudentDaoImpl.insertStudent(StudentDaoImpl.java:22)
at com.hbtemp.test.TestClass.main(TestClass.java:25)

我在网上搜索了这个错误，但我找不到解决方案，所以请帮我一些概念

模型类：Student.java

private int id;
private String firstName;
private String lastName;
private String address;
private int rollNo;

public int getId() {
    return id;
}
public void setId(int id) {
    this.id = id;
}
public String getFirstName() {
    return firstName;
}
public void setFirstName(String firstName) {
    this.firstName = firstName;
}
public String getLastName() {
    return lastName;
}
public void setLastName(String lastName) {
    this.lastName = lastName;
}
public String getAddress() {
    return address;
}
public void setAddress(String address) {
    this.address = address;
}
public int getRollNo() {
    return rollNo;
}
public void setRollNo(int rollNo) {
    this.rollNo = rollNo;
}

StudentDaoImpl.java

public void setHibernateTemplate(HibernateTemplate hibernateTemplate){
    this.hibernateTemplate = hibernateTemplate;
}

@Override
public int insertStudent(Student student) {
    hibernateTemplate.save(student);
    return 0;
}

ApplicationContext.xml

<bean id = "dataSource" class = "org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name = "driverClassName" value = "com.mysql.jdbc.Driver"></property>
    <property name = "url" value = "jdbc:mysql://localhost:3306/spring_jdbc_template"></property>
    <property name = "username" value = "root"></property>
    <property name = "password" value = ""></property>
</bean>

<bean id = "mySessionFactory" class = "org.springframework.orm.hibernate5.LocalSessionFactoryBean">
      <property name = "dataSource" ref = "dataSource"></property>
      <property name = "mappingResources">
         <list>
             <value>student.hbm.xml</value>
         </list>
      </property>
      <property name = "hibernateProperties">
          <map>
             <entry key="hibernate.dialect" value = "org.hibernate.dialect.MySQLDialect"></entry>
             <!-- <entry key="hibernate.hbm2ddl.auto" value = "update"></entry> -->
             <entry key="hibernate.show_sql" value = "true"></entry>
             <entry key="checkWriteOperation" value = "false"></entry>
             <entry key="current_session_context_class" value = "thread"></entry>
          </map>
      </property>
</bean> 

<bean id = "hibernateTemplate" class = "org.springframework.orm.hibernate5.HibernateTemplate">
     <property name = "sessionFactory" ref = "mySessionFactory"></property>
</bean>

<bean id = "studentDaoImpl" class = "com.hbtemp.dao.impl.StudentDaoImpl">
     <property name = "hibernateTemplate" ref = "hibernateTemplate"></property>
</bean>

student.hbm.xml：

<hibernate-mapping>
<class name = "com.hbtemp.model.Student" table = "student">
    <id name = "id" column = "ID">
        <generator class="identity"></generator>
    </id>

    <property name = "firstName" column = "FirstName"></property>
    <property name = "lastName" column = "LastName"></property>
    <property name = "address" column = "Address"></property>
    <property name = "rollNo" column = "Roll_NO"></property>
</class>

TestClass.java

ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
    StudentDaoImpl studentDaoImpl = (StudentDaoImpl)context.getBean("studentDaoImpl");

    Student student = new Student();
    student.setId(2);
    student.setFirstName("Prakash");
    student.setLastName("Gautam");
    student.setAddress("Bhaktapur");
    student.setRollNo(434);

    int status = studentDaoImpl.insertStudent(student);

如果我在 insertStudent方法中编写代码 hibernateTemplate.setCheckWriteOperations（false），它可以正常工作............但我的问题是......这是好的做法吗？如果不是很好的实践，请推荐好的实践

Answer 1

在 ApplicationContext.xml 中，您有

<bean id = "hibernateTemplate" class = "org.springframework.orm.hibernate5.HibernateTemplate">
   <property name = "sessionFactory" ref = "mySessionFactory"></property>
</bean>

尝试添加其他属性 checkWriteOperations ：

<property name="checkWriteOperations" value="false"/>

所以它应该是：

<bean id="template" class="org.springframework.orm.hibernate5.HibernateTemplate">
   <property name="sessionFactory" ref="mysessionFactory"/>
   <property name="checkWriteOperations" value="false"/> 
</bean>

Answer 2

在spring配置文件中添加“”，这肯定可以工作。

将您的会话转为FlushMode.COMMIT / AUTO或删除＆＃39; readOnly＆＃39;来自交易定义的标记

2 个答案: