more

source/libs/tdb/src/db/btree.c

@@ -16,6 +16,7 @@
 #include "tdbInt.h"
 
 struct SBTree {
+  pgno_t rootPage;
   // TODO
 };
 

source/libs/tdb/src/db/pgcache.c

@@ -123,7 +123,9 @@ int pgCacheClose(SPgCache *pPgCache) {
 }
 
 SPage *pgCacheFetch(SPgCache *pPgCache, pgid_t pgid) {
-  // TODO
+  SPage *pPage;
+
+  // 1. Check if the page is cached
   return NULL;
 }
 

source/libs/tdb/src/db/pgfile.c

@@ -67,12 +67,22 @@ int pgFileClose(SPgFile *pPgFile) {
 }
 
 SPage *pgFileFetch(SPgFile *pPgFile, pgno_t pgno) {
-  // TODO
-  return NULL;
+  SPgCache *pPgCache;
+  SPage *   pPage;
+  pgid_t    pgid;
+
+  pPgCache = pPgFile->pPgCache;
+  pPage = NULL;
+  memcpy(pgid.fileid, pPgFile->fileid, TDB_FILE_ID_LEN);
+  pgid.pgno = pgno;
+
+  pPage = pgCacheFetch(pPgCache, pgid);
+
+  return pPage;
 }
 
 int pgFileRelease(SPage *pPage) {
-  // TODO
+  pgCacheRelease(pPage);
   return 0;
 }