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我有一些字段要在hashmap中更新,我试图把它放在session.update(对象对象)。但我得到异常错误为未知实体:java.util.HashMap。这是我的代码。是否有可能更新特定字段休眠
private Map <String, Object> conditions=new HashMap <String, Object>();
public void addCondition(String field, Object condition){
conditions.put(field, condition);
}
public Object getFilter(String field){
return conditions.get(field);
}
public Map<String,Object>getFilterMap(){
return conditions;
}
更新这些字段:
class_name.addCondition("loginName", "dadan_evil");
class_name.addCondition("lastName", "Pirate");
session.update(filter.getFilterMap());//I tried this, but not working
User.hbm.xml:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="in.co.User" table="user">
<meta attribute="class-description">
This class contains the user detail.
</meta>
<id name = "loginName" type="string" column="loginName">
</id>
<property name="passCode" column="passCode" type="string"/>
<property name="firstName" column="firstName" type="string"/>
<property name="lastName" column="lastName" type="string"/>
<property name="alternateEMail" column="alternateEMail" type="string"/>
<property name="mobile" column="mobile" type="string"/>
<property name="sysAdmin" column="sysAdmin" type="boolean"/>
<property name="deleted" column="deleted" type="boolean"/>
<property name="authenticationCode" column="authenticationCode" type="string"/>
<property name="authenticated" column="authenticated" type="boolean"/>
</class>
</hibernate-mapping>
我的更新方法:
private static void updateFromQuery(DBFilter filter) throws Exception {
Session session = factory.openSession();
try{
Class<?> className = filter.getCollectionClass();
Criteria criteria = session.createCriteria(className);
criteria.add(Restrictions.allEq(filter.getFilterMap()));
//I dont know how to update this, just an imaginary parameter
session.update(filter.getFilterMap());
}catch(HibernateException e){
e.printStackTrace();
}finally{
session.close();
}
}
,我不能写下一个字符串查询要么因为我有多个表格和不同的值。而且我甚至动态地获得类名称。所以我不能使用字符串查询来为所有人共同使用。所以,如果我可以的话,请告诉我。
现在,我该如何更新这两个值到数据库。请帮助
您正尝试将java.util.HashMap直接存储在您的数据库中!你确定你要这么做吗? – mwe
您无法将hashmap传递给update()方法....您应该传递由@Entity批注注释的实体。从地图提取值并将它们放在实体类中,然后简单地更新 –
您是否已经使用Hibernate?你知道Hibernate是用于持久化整个对象(规定哪个属性映射到哪个字段),而不是用于搜索表名然后愚蠢地创建sql-update-statements? –