Hibernate-the object is worth the corresponding object according to the object class and primary key

Based on the object class and the corresponding primary key attribute, it is worth the corresponding entity:

Public <t> T findbyid (class <t> entityclass, serializable entityid ){
Return (t) Super. gethibernatetemplate (). Get (entityclass, entityid );
}

 

For example, findbyid (user. class, "123"), user is the entity class, and "123" is the value corresponding to the <ID> attribute in user. HBM. xml.

 

According to the object class and variable corresponding primary key attributes, it is worth all objects:

// Serializable... entityids is a variable parameter, that is, 0 or multiple

Public <t> List <t> findbyids (class <t> entityclass, final serializable... entityids ){

If(Entityids = NULL | entityids. Length = 0 ){
Return new arraylist <t> (0 );
}

// Obtain the object name based on the object class
String entityname = entityclass. getname ();

// Create a configuration object
Configuration CFG = new configuration ();
// Obtain mapping corresponding to the object based on the object name
Persistentclass = cfg. getclassmapping (entityname );

// If no mapping exists in configuration, add this object.
If (persistentclass = NULL ){
CFG = cfg. addclass (entityclass );
Persistentclass = cfg. getclassmapping (entityname );
}

// Obtain the name of the attribute corresponding to the object primary key
String pkname = persistentclass. getidentifierproperty (). getname ();

// Obtain the name of the primary key field of the table corresponding to the object (Do not confuse these two types.)
// String pkname = persistentclass. gettable (). getprimarykey (). getcolumn (0). getname ();
System. Out. println (pkname );
Try {
String querystring = "from" + entityname + "m where M ."
+ Pkname + "in (: entityids )";
If (entityids. Length = 1 ){
Querystring = "from" + entityclass. getname () + "e where E." + pkname + "=: entityid ";
}

Final string exehql = querystring;
Return super.gethibernatetemplate(cmd.exe cutefind (New hibernatecallback (){
Public object doinhibernate (session)
Throws hibernateexception, sqlexception {
Query query = session. createquery (exehql );
If (entityids. Length = 1 ){
Query = query. setparameter ("entityid", entityids [0]);
} Else {
Query = query. setparameterlist ("entityids", entityids );
}
Return query. List ();
}
});
} Catch (runtimeexception re ){
Throw re;
}
}