* Assign an integer id to every row in the ValidPaths table in order

  to make the Refs table more space-efficient.  For instance, this
  reduces the size of the database on my laptop from 93 MiB to 18
  MiB.  (It was 72 MiB with the old schema on an ext3 disk with a 1
  KiB block size.)

1 files changed, 16 insertions, 2 deletions

diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index 55637dd859..03c5d76b37 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -1229,6 +1229,8 @@ void LocalStore::upgradeStore6()
     
     if (sqlite3_exec(db, "begin;", 0, 0, 0) != SQLITE_OK)
         throw SQLiteError(db, "running `begin' command");
+
+    std::map<Path, sqlite3_int64> pathToId;
     
     foreach (PathSet::iterator, i, validPaths) {
         ValidPathInfo info = queryPathInfo(*i, true);
@@ -1245,12 +1247,24 @@ void LocalStore::upgradeStore6()
         if (sqlite3_step(registerStmt) != SQLITE_DONE)
             throw SQLiteError(db, "registering valid path in database");
 
+        pathToId[*i] = sqlite3_last_insert_rowid(db);
+
+        std::cerr << ".";
+    }
+
+    std::cerr << "|";
+    
+    foreach (PathSet::iterator, i, validPaths) {
+        ValidPathInfo info = queryPathInfo(*i, true);
+        
         foreach (PathSet::iterator, j, info.references) {
             if (sqlite3_reset(addRefStmt) != SQLITE_OK)
                 throw SQLiteError(db, "resetting statement");
-            if (sqlite3_bind_text(addRefStmt, 1, i->c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
+            if (sqlite3_bind_int(addRefStmt, 1, pathToId[*i]) != SQLITE_OK)
                 throw SQLiteError(db, "binding argument 1");
-            if (sqlite3_bind_text(addRefStmt, 2, j->c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
+            if (pathToId.find(*j) == pathToId.end())
+                throw Error(format("path `%1%' referenced by `%2%' is invalid") % *j % *i);
+            if (sqlite3_bind_int(addRefStmt, 2, pathToId[*j]) != SQLITE_OK)
                 throw SQLiteError(db, "binding argument 2");
             if (sqlite3_step(addRefStmt) != SQLITE_DONE)
                 throw SQLiteError(db, "adding reference to database");