The base class pojo of the bean of oschina

Package my. dB;
Import java. Io. serializable;
Import java. SQL. preparedstatement;
Import java. SQL. resultset;
Import java. SQL. sqlexception;
Import java. util. arraylist;
Import java. util. List;
Import java. util. Map;

Import my. cache. cachemanager;
Import my. util. inflector;
Import net. oschina. Beans. user;
Import org. Apache. commons. beanutils. beanutils;
Import org. Apache. commons. dbutils. dbutils;
* Base class of the database object
* @ Author winter Lau
* @ Date 2010-1-22 11:33:56 AM
*/
Public class pojo implements serializable {

Protected final static transient char obj_count_cache_key = '#';
Private long ___ key_id;

Public long GETID () {return ___ key_id ;}
Public void setid (long ID) {This. ___ key_id = ID ;}

Private string _ this_table_name;

Public static void evictcache (String cache, serializable key ){
Cachemanager. evict (cache, key );
}

Public static void setcache (String cache, serializable key, serializable value ){
Cachemanager. Set (cache, key, value );
Public static object getcache (String cache, serializable key ){
Return cachemanager. Get (cache, key );
* List all objects by PAGE
* @ Param page
* @ Param size
* @ Return
Public list <? Extends pojo> List (INT page, int size ){
String SQL = "select * from" + tablename () + "order by ID DESC ";
Return queryhelper. query_slice (getclass (), SQL, page, size );
Public list <? Extends pojo> filter (string filter, int page, int size ){
String SQL = "select * from" + tablename () + "where" + filter + "order by ID DESC ";
Return queryhelper. query_slice (getclass (), SQL, page, size );
* Count the total number of records of this object
* @ Return
*/
Public int totalcount (string filter ){
Return (INT) queryhelper. Stat ("select count (*) from" + tablename () + "where" + filter );
* Returns the table name corresponding to the default object.
* @ Return
Protected string tablename (){
If (_ this_table_name = NULL)
_ This_table_name = "OSC _" + inflector. getinstance (). tableize (getclass ());
Return _ this_table_name;
* Return the cache region name of the object.
* @ Return
Public String cacheregion () {return this. getclass (). getsimplename ();}

* Indicates whether to cache objects by ID. This method is valid for get (long ID ).
* @ Return
Protected Boolean isobjectcachedbyid () {return false ;}
* Insert an object to a database table
* @ Return
*/
Public long save (){
If (GETID ()> 0)
_ Insertobject (this );
Else
Setid (_ insertobject (this ));
If (this. isobjectcachedbyid ())
Cachemanager. evict (cacheregion (), obj_count_cache_key );
Return GETID ();
* Delete an object based on the id Primary Key
* @ Return
*/Http://www.huiyi8.com/jiaoben/
Public Boolean Delete () {webpage special effect code
Boolean DR = evict (queryhelper. Update ("delete from" + tablename () + "where id =? ", GETID () = 1 );
If (DR)
Cachemanager. evict (cacheregion (), obj_count_cache_key );
Return Dr;
* Determines whether to clear the object cache based on the condition.
* @ Param er
* @ Return
*/
Public Boolean evict (Boolean ER ){
If (ER & isobjectcachedbyid ())
Cachemanager. evict (cacheregion (), GETID ());
Return er;
* Clear the object cache of the specified Primary Key
* @ Param obj_id
*/
Protected void evict (long obj_id ){
Cachemanager. evict (cacheregion (), obj_id );
Public pojo get (Java. Math. biginteger ID ){
If (ID = NULL) return NULL;
Return get (Id. longvalue ());
* Read the object details based on the primary key and automatically determine whether the cache is required based on the preset method.
* @ Param ID
* @ Return
@ Suppresswarnings ("unchecked ")
Public <t extends pojo> t get (long ID ){
If (ID <= 0) return NULL;
String SQL = "select * from" + tablename () + "where id =? ";
Boolean cached = isobjectcachedbyid ();
Return (t) queryhelper. read_cache (getclass (), cached? Cacheregion (): NULL, ID, SQL, ID );
Public list <? Extends pojo> batchget (list <long> IDs ){
If (IDs = NULL | IDs. Size () = 0)
Return NULL;
Stringbuilder SQL = new stringbuilder ("select * from" + tablename () + "where ID in (");
For (INT I = 1; I <= IDs. Size (); I ++ ){
SQL. append ('? ');
If (I <IDs. Size ())
SQL. append (',');
SQL. append (')');
List <? Extends pojo> beans = queryhelper. Query (getclass (), SQL. tostring (), IDs. toarray (new object [IDs. Size ()]);
If (isobjectcachedbyid ()){
For (Object Bean: Beans ){
Cachemanager. Set (cacheregion (), (pojo) bean). GETID (), (serializable) bean );
Return beans;
* Count the total number of records of this object
* @ Return
*/
Public int totalcount (){
If (this. isobjectcachedbyid ())
Return (INT) queryhelper. stat_cache (cacheregion (), obj_count_cache_key, "select count (*) from" + tablename ());
Return (INT) queryhelper. Stat ("select count (*) from" + tablename ());
* Load projects in batches
* @ Param PIDs
* @ Return
*/
@ Suppresswarnings ("rawtypes ")
Public list loadlist (list <long> p_pids ){
If (p_pids = NULL)
Return NULL;
Final list <long> PIDs = new arraylist <long> (p_pids.size ());
For (number OBJ: p_pids ){
PIDs. Add (obj. longvalue ());
}
String cache = This. cacheregion ();
List <pojo> prjs = new arraylist <pojo> (PIDS. size () {for (INT I = 0; I <PIDs. size (); I ++) add (null );}};
List <long> no_cache_ids = new arraylist <long> ();
For (INT I = 0; I <PIDs. Size (); I ++ ){
Long pid = PIDs. Get (I );
Pojo OBJ = (pojo) cachemanager. Get (cache, pid );

If (OBJ! = NULL)
Prjs. Set (I, OBJ );
Else {
No_cache_ids.add (PID );
If (no_cache_ids.size ()> 0 ){
List <? Extends pojo> no_cache_prjs = batchget (no_cache_ids );
If (no_cache_prjs! = NULL)
For (pojo OBJ: no_cache_prjs ){
Prjs. Set (PIDS. indexof (obj. GETID (), OBJ );
No_cache_ids = NULL;
// Check users
If (prjs! = NULL & isautoloaduser ()){
List <long> no_cache_userids = new arraylist <long> ();
String user_cache = user. instance. cacheregion ();
For (pojo: prjs ){
If (pojo = NULL)
Continue;
Long userid = pojo. getautoloaduser ();
If (userid> 0 &&! No_cache_userids.contains (userid )){
Pojo user = (pojo) cachemanager. Get (user_cache, userid );
If (user = NULL ){
No_cache_userids.add (userid );
If (no_cache_userids.size ()> 0)
User. instance. batchget (no_cache_userids );

No_cache_userids = NULL;
Return prjs;
Protected Boolean isautoloaduser () {return false ;}
Protected long getautoloaduser () {return 0l ;}
* Insert an object
* @ Param OBJ
* @ Return returns the primary key of the inserted object.
*/

Private Static long _ insertobject (pojo OBJ ){
Map <string, Object> pojo_bean = obj. listinsertablefields ();
String [] fields = pojo_bean.keyset (). toarray (New String [pojo_bean.size ()]);
Stringbuilder SQL = new stringbuilder ("insert ");
SQL. append (obj. tablename ());
SQL. append ('(');
For (INT I = 0; I <fields. length; I ++ ){
If (I> 0) SQL. append (',');
SQL. append (fields [I]);
}
SQL. append (") values (");
For (INT I = 0; I <fields. length; I ++ ){
If (I> 0) SQL. append (',');
SQL. append ('? ');
}
SQL. append (')');
Preparedstatement PS = NULL;
Resultset rs = NULL;
Try {
PS = queryhelper. getconnection (). preparestatement (SQL. tostring (), preparedstatement. return_generated_keys );
For (INT I = 0; I <fields. length; I ++ ){
PS. setobject (I + 1, pojo_bean.get (fields [I]);
}
Ps.exe cuteupdate ();
Rs = ps. getgeneratedkeys ();
Return Rs. Next ()? Rs. getlong (1):-1;
} Catch (sqlexception e ){
Throw new dbexception (E );
} Finally {
Dbutils. closequietly (RS );
Dbutils. closequietly (PS );
SQL = NULL;
Fields = NULL;
Pojo_bean = NULL;
}
}

/**
* Lists the Domain sets to be inserted into the database. Subclass can override this method.
* @ Return
*/
@ Suppresswarnings ("unchecked ")
Protected Map <string, Object> listinsertablefields (){
Try {
Map <string, Object> props = beanutils. Describe (this );
If (GETID () <= 0)
Props. Remove ("ID ");
Props. Remove ("class ");
Return props;
} Catch (exception e ){
Throw new runtimeexception ("exception when fetching fields of" + this );
@ Override
Public Boolean equals (Object OBJ ){
If (OBJ = NULL) return false;
If (OBJ = This) return true;
// Different subclasses are not equal even if the IDs are the same
If (! Getclass (). Equals (obj. getclass ()))
Return false;
Pojo WB = (pojo) OBJ;
Return WB. GETID () = GETID ();
}