diff --git a/src/db_mysql.nim b/src/db_mysql.nim
index d57e8d6416..37bea45b42 100644
--- a/src/db_mysql.nim
+++ b/src/db_mysql.nim
@@ -57,7 +57,8 @@ when false:
       binding: seq[MYSQL_BIND]
     discard mysql_stmt_close(stmt)
 
-proc dbQuote(s: string): string =
+proc dbQuote*(s: string): string =
+  ## DB quotes the string.
   result = "'"
   for c in items(s):
     if c == '\'': add(result, "''")
@@ -69,7 +70,10 @@ proc dbFormat(formatstr: TSqlQuery, args: varargs[string]): string =
   var a = 0
   for c in items(string(formatstr)):
     if c == '?':
-      add(result, dbQuote(args[a]))
+      if args[a] == nil:
+        add(result, "NULL")
+      else:
+        add(result, dbQuote(args[a]))
       inc(a)
     else: 
       add(result, c)
@@ -115,7 +119,10 @@ iterator fastRows*(db: TDbConn, query: TSqlQuery,
       if row == nil: break
       for i in 0..L-1: 
         setLen(result[i], 0)
-        add(result[i], row[i])
+        if row[i] == nil:
+          result[i] = nil
+        else:
+          add(result[i], row[i])
       yield result
     properFreeResult(sqlres, row)
 
@@ -132,7 +139,10 @@ proc getRow*(db: TDbConn, query: TSqlQuery,
     if row != nil: 
       for i in 0..L-1: 
         setLen(result[i], 0)
-        add(result[i], row[i])
+        if row[i] == nil:
+          result[i] = nil
+        else:
+          add(result[i], row[i])
     properFreeResult(sqlres, row)
 
 proc getAllRows*(db: TDbConn, query: TSqlQuery, 
@@ -150,7 +160,11 @@ proc getAllRows*(db: TDbConn, query: TSqlQuery,
       if row == nil: break
       setLen(result, j+1)
       newSeq(result[j], L)
-      for i in 0..L-1: result[j][i] = $row[i]
+      for i in 0..L-1:
+        if row[i] == nil:
+          result[j][i] = nil
+        else:
+          result[j][i] = $row[i]
       inc(j)
     mysql.freeResult(sqlres)