brt cursor get both feature

git-svn-id: file:///svn/tokudb@301 c7de825b-a66e-492c-adef-691d508d4ae1

newbrt/brt.h

@@ -30,7 +30,7 @@ int show_brt_blocknumbers(BRT);
 
 typedef struct brt_cursor *BRT_CURSOR;
 int brt_cursor (BRT, BRT_CURSOR*);
-int brt_c_get (BRT_CURSOR cursor, DBT *kbt, DBT *vbt, int brtc_flags);
+int brt_cursor_get (BRT_CURSOR cursor, DBT *kbt, DBT *vbt, int brtc_flags, DB *db);
 int brt_cursor_delete(BRT_CURSOR cursor, int flags);
 int brt_cursor_close (BRT_CURSOR curs);
 

newbrt/pma.c

@@ -442,7 +442,7 @@ int pma_cursor_set_position_next (PMA_CURSOR c) {
     return DB_NOTFOUND;
 }
 
-int pma_cget_current (PMA_CURSOR c, DBT *key, DBT *val) {
+int pma_cursor_get_current(PMA_CURSOR c, DBT *key, DBT *val) {
     if (c->position == -1)
         return DB_NOTFOUND;
     PMA pma = c->pma;
@@ -458,16 +458,37 @@ int pma_cursor_set_key(PMA_CURSOR c, DBT *key, DB *db) {
     PMA pma = c->pma;
     int here = pmainternal_find(pma, key, db);
     assert(0<=here ); assert(here<=pma_index_limit(pma));
-    if (here==pma_index_limit(pma)) 
-        return DB_NOTFOUND;
+    int r = DB_NOTFOUND;
+    if (here < pma->N) {
         DBT k2;
         struct kv_pair *pair = pma->pairs[here];
-    if (kv_pair_valid(pair) && pma->compare_fun(db, key, fill_dbt(&k2, kv_pair_key(pair), kv_pair_keylen(pair)))==0) {
+        if (kv_pair_valid(pair) && 
+            pma->compare_fun(db, key, fill_dbt(&k2, kv_pair_key(pair), kv_pair_keylen(pair)))==0) {
             __pma_delete_resume(c->pma, c->position);
             c->position = here;
-        return 0;
-    } else
-        return DB_NOTFOUND;
+            r = 0;
+        }
+    } 
+    return r;
+}
+
+int pma_cursor_set_both(PMA_CURSOR c, DBT *key, DBT *val, DB *db) {
+    PMA pma = c->pma;
+    int here = pmainternal_find(pma, key, db);
+    assert(0<=here ); assert(here<=pma_index_limit(pma));
+    int r = DB_NOTFOUND;
+    if (here < pma->N) {
+        DBT k2, v2;
+        struct kv_pair *pair = pma->pairs[here];
+        if (kv_pair_valid(pair) && 
+            pma->compare_fun(db, key, fill_dbt(&k2, kv_pair_key(pair), kv_pair_keylen(pair))) == 0 &&
+            pma->compare_fun(db, val, fill_dbt(&v2, kv_pair_val(pair), kv_pair_vallen(pair))) == 0) {
+            __pma_delete_resume(c->pma, c->position);
+            c->position = here;
+            r = 0;
+        }
+    } 
+    return r;
 }
 
 int pma_cursor_set_range(PMA_CURSOR c, DBT *key, DB *db) {
@@ -476,51 +497,36 @@ int pma_cursor_set_range(PMA_CURSOR c, DBT *key, DB *db) {
     assert(0<=here ); assert(here<=pma_index_limit(pma));
 
     /* find the first valid pair where key[here] >= key */
+    int r = DB_NOTFOUND;
     while (here < pma->N) {
         struct kv_pair *pair = pma->pairs[here];
         if (kv_pair_valid(pair)) {
             __pma_delete_resume(c->pma, c->position);
             c->position = here;
-            return 0;
+            r = 0;
+            break;
         }
         here += 1;
     }
-
-    return DB_NOTFOUND;
+    return r;
 }
 
 int pma_cursor_delete_under(PMA_CURSOR c, int *kvsize) {
     int r = DB_NOTFOUND;
-
     if (c->position >= 0) {
         PMA pma = c->pma;
         assert(c->position < pma->N);
         struct kv_pair *kv = pma->pairs[c->position];
         if (kv_pair_valid(kv)) {
-            if (kvsize) *kvsize = kv_pair_keylen(kv) + kv_pair_vallen(kv);
+            if (kvsize) 
+                *kvsize = kv_pair_keylen(kv) + kv_pair_vallen(kv);
             pma->pairs[c->position] = kv_pair_set_deleted(kv);
             r = 0;
         }
     }
-
     return r;
 }
 
-#if 0
-int pma_cget_first (PMA_CURSOR c, YBT *key, YBT *val) {
-    PMA pma=c->pma;
-    c->position=0;
-    if (pma->n_pairs_present==0) return DB_NOTFOUND;
-    while (pma->pairs[c->position].key==0 && c->position<pma->N) {
-	c->position++;
-    }
-    assert(c->position<pma->N && pma->pairs[c->position].key!=0);
-    ybt_set_value(key, pma->pairs[c->position].key, pma->pairs[c->position].keylen, &c->skey);
-    ybt_set_value(val, pma->pairs[c->position].val, pma->pairs[c->position].vallen, &c->sval);
-    return 0;
-}
-#endif
-
 int pma_cursor_free (PMA_CURSOR *cursp) {
     PMA_CURSOR curs=*cursp;
     PMA pma = curs->pma;

newbrt/pma.h

@@ -71,26 +71,26 @@ int pma_bulk_insert(PMA pma, DBT *keys, DBT *vals, int n_newpairs);
 int pma_cursor (PMA, PMA_CURSOR *);
 int pma_cursor_free (PMA_CURSOR*);
 
-/*
- * get the pma that a pma cursor is bound to
- *
- * c - the pma cursor
- * pma - the pma that the cursor is bound to
- */
+/* get the pma that a pma cursor is bound to */
 int pma_cursor_get_pma(PMA_CURSOR c, PMA *pma);
 int pma_cursor_set_position_last (PMA_CURSOR c);
 int pma_cursor_set_position_first (PMA_CURSOR c);
 int pma_cursor_set_position_next (PMA_CURSOR c); /* Requires the cursor is init'd.  Returns DB_NOTFOUND if we fall off the end. */
 int pma_cursor_set_position_prev (PMA_CURSOR c);
-int pma_cget_current (PMA_CURSOR c, DBT *key, DBT *val);
 
-/* set the cursor by key */
+/* get the key and data under the cursor */
+int pma_cursor_get_current(PMA_CURSOR c, DBT *key, DBT *val);
+
+/* set the cursor to the matching key and value pair */
+int pma_cursor_set_both(PMA_CURSOR c, DBT *key, DBT *val, DB *db);
+
+/* move the cursor to the kv pair matching the key */
 int pma_cursor_set_key(PMA_CURSOR c, DBT *key, DB *db);
 
-/* set the cursor to the smallest key >= requested key */
+/* set the cursor to the smallest key in the pma >= key */
 int pma_cursor_set_range(PMA_CURSOR c, DBT *key, DB *db);
 
-/* delete the key under the cursor */
+/* delete the key value pair under the cursor, return the size of the pair */
 int pma_cursor_delete_under(PMA_CURSOR c, int *kvsize);
 
 /* get the last key and value in the pma */
@@ -117,7 +117,7 @@ void pma_iterate (PMA, void(*)(bytevec,ITEMLEN,bytevec,ITEMLEN, void*), void*);
       ITEMLEN datalenvar = pmanode_vallen(table, __i);                 \
       body;                                                            \
 } } })
-#endif
 
 int keycompare (bytevec key1, ITEMLEN key1len, bytevec key2, ITEMLEN key2len);
 
+#endif

src/Makefile

 CFLAGS = -W -Wall -Wno-unused -g -fPIC
 CPPFLAGS = -I../include -I../newbrt
+
 install: libdb.so
 	cp libdb.so ../lib/
+
+clean:
+	rm -rf *.so *.o
+
 ydb.o: ../include/db.h ../newbrt/cachetable.h
 DBBINS = ydb.o ../newbrt/brt.o ../newbrt/brt-serialize.o ../newbrt/cachetable.o ../newbrt/hashtable.o ../newbrt/header-io.o ../newbrt/key.o ../newbrt/memory.o ../newbrt/pma.o ../newbrt/ybt.o
 libdb.so: $(DBBINS)

src/ydb.c

@@ -260,7 +260,7 @@ struct __toku_dbc_internal {
 };
 			  
 int __toku_c_get (DBC *c, DBT *key, DBT *data, u_int32_t flag) {
-    int r = brt_c_get(c->i->c, key, data, flag);
+    int r = brt_cursor_get(c->i->c, key, data, flag, c->i->db);
     return r;
 }