DBOPEN

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#include <sys/types.h>
#include <limits.h>
#include <db.h>

DB *
dbopen(const char *file, int flags, int mode, DBTYPE type,


     const void *openinfo);

ÀâÌÀ

dbopen ¤Ï file ¤òÆɤ߹þ¤ß (Æɤ߽ñ¤­) ¤¹¤ë¤¿¤á¤Ë¥ª¡¼¥×¥ó¤¹¤ë¡£ file ¥Ñ¥é¥á¡¼¥¿¤ò NULL ¤Ë¤¹¤ì¤Ð¡¢ ¥Ç¥£¥¹¥¯¾å¤ËÊݸ¤·¤¿¤¯¤Ê¤¤¥Õ¥¡¥¤¥ë¤òºî¤ë¤³¤È¤â¤Ç¤­¤ë¡£

flags ¤È mode °ú¿ô ¤Ï open(2) ¥ë¡¼¥Á¥ó¤Ç»ØÄꤹ¤ë¤Î¤ÈƱÍͤǤ¢¤ë¡£¤¿¤À¤· O_CREAT, O_EXCL, O_EXLOCK, O_NONBLOCK, O_RDONLY, O_RDWR, O_SHLOCK ¤È O_TRUNC ¥Õ¥é¥°¤À¤±¤¬°ÕÌ£¤ò»ý¤Ä¡£ (Ãí°Õ: O_WRONLY ¤Ç¥Ç¡¼¥¿¥Ù¡¼¥¹¥Õ¥¡¥¤¥ë¤ò³«¤¯»ö¤Ï½ÐÍè¤Ê¤¤)

type °ú¿ô¤Ï DBTYPE ·¿¤Ç¤¢¤ë (¥¤¥ó¥¯¥ë¡¼¥É¥Õ¥¡¥¤¥ë <db.h> ¤ÇÄêµÁ¤µ¤ì¤Æ¤¤¤ë)¡£ DB_BTREE, DB_HASH, DB_RECNO ¤Î¤¤¤º¤ì¤«¤ò¥»¥Ã¥È¤Ç¤­¤ë¡£

openinfo °ú¿ô¤Ï¥¢¥¯¥»¥¹¥á¥½¥Ã¥É¤Ë¸ÇÍ­¤Ê¹½Â¤ÂΤؤΥݥ¤¥ó¥¿¤Ç¤¢¤ë¡£ ¤½¤ì¤¾¤ì¤Î¹½Â¤ÂΤ˴ؤ·¤Æ¤Ï³Æ¥¢¥¯¥»¥¹¥á¥½¥Ã¥É¤Î ¥Þ¥Ë¥å¥¢¥ë¥Ú¡¼¥¸¤Ëµ­½Ò¤µ¤ì¤Æ¤¤¤ë¡£ openinfo ¤¬ NULL ¤Î¾ì¹ç¡¢¤½¤ì¤¾¤ì¤Î¥¢¥¯¥»¥¹¥á¥½¥Ã¥É¤È¥·¥¹¥Æ¥à¤È¤ËŬ¹ç¤·¤¿ ¥Ç¥Õ¥©¥ë¥È¤¬ÍѤ¤¤é¤ì¤ë¡£

dbopen ¤Ï¡¢À®¸ù¤·¤¿¾ì¹ç DB ¹½Â¤ÂΤؤΥݥ¤¥ó¥¿¤ò¡¢¥¨¥é¡¼¤Î¾ì¹ç NULL ¤òÊÖ¤¹¡£ DB ¹½Â¤ÂÎ¤Ï <db.h> ¥¤¥ó¥¯¥ë¡¼¥É¥Õ¥¡¥¤¥ë¤ÎÃæ¤ÇÄêµÁ¤µ¤ì¤Æ¤ª¤ê¡¢ ¾¯¤Ê¤¯¤È¤â°Ê²¼¤Î¤è¤¦¤Ê¥Õ¥£¡¼¥ë¥É¤ò»ý¤Ã¤Æ¤¤¤ë¡£

typedef struct {
DBTYPE type;
int (*close)(const DB *db);
int (*del)(const DB *db, const DBT *key, u_int flags);
int (*fd)(const DB *db);
int (*get)(const DB *db, DBT *key, DBT *data, u_int flags);
int (*put)(const DB *db, DBT *key, const DBT *data,


     u_int flags);
int (*sync)(const DB *db, u_int flags);
int (*seq)(const DB *db, DBT *key, DBT *data, u_int flags);

} DB;

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type

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close

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del

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flag °ú¿ô¤Ï¼¡¤ÎÃͤ¬¥»¥Ã¥È¤Ç¤­¤ë¡£

R_CURSOR

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delete ¥ë¡¼¥Á¥ó¤Ï¥¨¥é¡¼¤Î¾ì¹ç -1 ¤òÊÖ¤·( errno ¤ò¥»¥Ã¥È¤¹¤ë)¡¢À®¸ù¤¹¤ë¤È 0 ¤òÊÖ¤¹¡£¤Þ¤¿»ØÄê¤Î key ¤¬¥Õ¥¡¥¤¥ëÃæ¤Ë̵¤¤¾ì¹ç 1 ¤òÊÖ¤¹¡£

fd

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get

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put

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flag °ú¿ô¤Ë¤Ï¼¡¤ÎÃͤΤ¦¤Á¤Î¤É¤ì¤«°ì¤Ä¤¬¥»¥Ã¥È¤Ç¤­¤ë¡£

R_CURSOR

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R_IAFTER

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R_IBEFORE

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R_NOOVERWRITE

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seq

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R_CURSOR

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R_NEXT

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sync

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typedef struct {

void *data;
size_t size;

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data

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size

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fd ¥ë¡¼¥Á¥ó¤Ï¥á¥â¥êÆâ¥Ç¡¼¥¿¥Ù¡¼¥¹¤ËÂФ·¼ºÇÔ¤¹¤ë¤È errno ¤Ë ENOENT ¤ò¥»¥Ã¥È¤¹¤ë¡£

sync ¥ë¡¼¥Á¥ó¤Ï¼ºÇÔ¤¹¤ë¤È¥é¥¤¥Ö¥é¥ê¥ë¡¼¥Á¥ó fsync(2) ¤Ç»ØÄꤵ¤ì¤Æ¤¤¤ë¥¨¥é¡¼¤Ë±þ¤¸¤¿ errno ¤ò¥»¥Ã¥È¤¹¤ë¡£  

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LIBTP: Portable, Modular Transactions for UNIX, Margo Seltzer, Michael Olson, USENIX proceedings, Winter 1992.  

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