dbcache.h

bonddb 是一个源于PostgreSQL封装包的对象。它是一个由C/C++编写的快速数据提取层应用软件

#ifndef dbcache_h
#define dbcache_h

#include "dbheader.h"

/**
 * Caching module.
 *
 * All this code resided in both dbtoliet and dbuniqueid but i brought the code into
 * here so dbuniqueid and dbtoliet can concentrate with what they do best.
 * DbCache attempts to act as both reading and writing cache for records.
 * It is also used for filtering purposes.
 */

struct DbCache
   {
   /* gchar* list of fields, NULL's will be present for those not retrieved or set etc */
   gchar **value;
   /* flags for data */
   gchar *flags;
   /* width of data */
   gint num;
   /* this is the row it refers to */
   gint origrow;
   /* UniqueId of this row */
   DbUniqueId *id;
   /* Filtering and sorting */
   DbFilter *filter;
   /* state of the row, whether its for reading or writing */
   enum
   {
      OBJ_READ,
      OBJ_EDITREAD,
      OBJ_NEW,
      OBJ_EDITNEW
   }
   state;
   /* has the row been changed in anyway */
   gboolean changed;
   };

/** State defintion:
 *
 * OBJ_READ is a space filler. hmmm . 
 * OBJ_EDITREAD is that the object was read in and then edited. 
 * OBJ_NEW means that its a completely new object.
 * OBJ_EDITNEW means you just edited a freshly new object that was written back to db.
 */
gint db_cache_cleanup(Object *obj);
DbCache * db_cache_moveto(Object *obj);
DbCache * db_cache_isincache(Object * obj);
gint db_cache_delete(Object * obj);

gint db_cache_getvalue(Object * obj, DbCache * cache, gchar * field, gchar * table, gchar ** value);
gint db_cache_setvalue(Object * obj, DbCache * cache, gchar * field, gchar * table, gchar * value);
gint db_cache_updateid(Object * obj, DbUniqueId * id, DbCache *cache);

void db_cache_debug(Object *obj);

gboolean db_cache_hascache(Object *obj, int i);

#endif