Iterate precompute datasets

1 files changed, 11 insertions, 4 deletions

diff --git a/gn/db/mysql.scm b/gn/db/mysql.scm
index fb7093a..760e578 100644
--- a/gn/db/mysql.scm
+++ b/gn/db/mysql.scm
@@ -18,7 +18,8 @@
             get-row
             get-rows
             get-rows-apply
-            check
+            has-result?
+            ensure
             ;db-open
             ;db-query
             ;db-get-row
@@ -36,7 +37,7 @@
 (define (call-with-db thunk)
   (thunk (db-open)))
 
-(define (check db)
+(define (ensure db)
   "Use DBI-style handle to report an error. On error the program will stop."
   (match (dbi-get_status db)
     ((stat . msg) (if (= stat 0)
@@ -46,15 +47,21 @@
                        (newline)
                        (assert stat))))))
 
+(define (has-result? db)
+  "Return #t or #f if result is valid"
+  (match (dbi-get_status db)
+    ((stat . msg) (= stat 0))))
+
 (define (get-row db)
+  "Return record and #f is it was the last one"
   (dbi-get_row db))
 
 (define (get-rows db list)
   "After running dbi-query we can fetch all rows and return them as a list of records, which is an alist:
 
     (dbi-query db \"SELECT StrainId,Strain.Name FROM Strain, StrainXRef WHERE StrainXRef.StrainId = Strain.Id AND StrainXRef.InbredSetId = 1 ORDER BY StrainId;\")
-    (db-check db)
-    (display (db-get-rows db '()))
+    (ensure db)
+    (display (get-rows db '()))
 
     (((StrainId . 4) (Name . BXD1)) ((StrainId . 5) (Name . BXD2))...
 "