Hibernate验证器
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29-09-2019 - |
题
我想将Hibernate(ORM)与Hibernate验证器一起使用。在文档中,我们可以找到以下内容:
开箱即用,冬眠注释(从Hibernate 3.5.x开始)将使您为实体定义的约束转换为映射元数据。例如,如果您的实体的属性被注释@NotNull,则将其列在Hibernate生成的DDL模式中声明为无效。
这是我的代码:
test/myclass.java
public class MyClass implements Serializable
{
private long id;
@Length(max=36)
@NotNull
private String myString;
public MyClass() {};
public MyClass(String myString)
{
this.myString = myString;
}
public long getId()
{
return id;
}
public void setId(long id)
{
this.id = id;
}
public String getMyString()
{
return myString;
}
public void setMyString(String myString)
{
this.myString = myString;
}
}
test/myclass.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2010-08-02 21:13:04 by Hibernate Tools 3.3.0.GA -->
<hibernate-mapping>
<class name="test.MyClass" table="my_table" >
<id name="id" type="long" unsaved-value="0">
<column name="id" />
<generator class="native"/>
</id>
<property name="myString" type="string">
<column name="my_string"/>
</property>
</class>
</hibernate-mapping>
Hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost/htest</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="hibernate.show_sql">true</property>
<!-- Mapping files -->
<mapping resource="test/myClass.hbm.xml"/>
</session-factory>
</hibernate-configuration>
最后:test.java
public class Test
{
public static void main(String[] args)
{
Session session = null;
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
MyClass str1 = null;
Transaction tx = null;
try
{
session = sessionFactory.openSession();
tx = session.beginTransaction();
str1 = new MyClass("hello");
session.save(str1);
tx.commit();
}
catch(Exception e)
{
e.printStackTrace();
}
finally
{
session.close();
}
}
}
因此,我希望列Mystring的长度为36,但它具有255(默认值),不会为空,但为null(默认值)。
控制台打印以下内容:
16:35:46,641 INFO SchemaUpdate:155 - Running hbm2ddl schema update
16:35:46,642 INFO SchemaUpdate:167 - fetching database metadata
16:35:46,644 INFO SchemaUpdate:179 - updating schema
16:35:46,647 INFO DatabaseMetadata:119 - table not found: my_table
16:35:46,649 INFO DatabaseMetadata:119 - table not found: my_table
16:35:46,650 DEBUG SchemaUpdate:203 - create table my_table (id bigint not null auto_increment, my_string varchar(255), primary key (id))
16:35:46,755 INFO SchemaUpdate:217 - schema update complete
16:35:46,793 DEBUG SQL:111 - insert into my_table (my_string) values (?)
Hibernate: insert into my_table (my_string) values (?)
版本:Hibernate-Distribution-3.5.4-Final-Dist和Hibernate-Validator-4.1.0.-Final-Dist
有人在我的代码中看到错误吗?有任何想法吗?
提前致谢
解决方案
好吧,您不使用注释。代替:
SessionFactory sessionFactory = new Configuration()
.configure()
.buildSessionFactory();
尝试:
SessionFactory sessionFactory = new AnnotationConfiguration()
.configure()
.buildSessionFactory();
我个人会完全移动注释,即还使用注释来映射实体(实际上,我将完全移动到JPA 2.0并使用该实体 EntityManager
API)。但是以上应该有效。
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