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| author | Eugeniy Mikhailov <evgmik@gmail.com> | 2013-12-05 09:25:46 -0500 |
|---|---|---|
| committer | Eugeniy Mikhailov <evgmik@gmail.com> | 2013-12-05 09:25:46 -0500 |
| commit | f1e16fdd76c427ed5de1eb1ab7c856b81ca9fd0b (patch) | |
| tree | 4326e9e917805e44d1b9aff9a6b352d3a84ce255 | |
| parent | e15d379d45e78e33d6ee54504f538526480dbc66 (diff) | |
| download | GradeBook-f1e16fdd76c427ed5de1eb1ab7c856b81ca9fd0b.tar.gz GradeBook-f1e16fdd76c427ed5de1eb1ab7c856b81ca9fd0b.zip | |
Access to database wrapped in one transaction
This speedups weights recalculations which use a lot of update
statements. Strangely on some computers it works fast even without
enabling one transaction mode.
| -rwxr-xr-x | GradeBook.tcl | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/GradeBook.tcl b/GradeBook.tcl index 5bff792..cb7ddf4 100755 --- a/GradeBook.tcl +++ b/GradeBook.tcl @@ -86,9 +86,29 @@ if { [file exists $dbfile] && ("$coursedbfname" ne "") } { htmlHeader puts "<body>" sqlite3 db $dbfile + + # we will do everything with in one transaction + # otherwise I see performance degradation on some computers + # when there are a lot if update statements + set eval_str [concat BEGIN TRANSACTION] + set err [catch {db eval $eval_str } errStat] + if { $err } { + htmlErrorMsg $errStat + dbg "the following error happen: $errStat" msg_level_critical + } + set permission_list [ AccessGroupRights db $user ] htmlTop $permission_list ChoseAction $action $permission_list $user + + # ending transaction right before closing database + set eval_str [concat END TRANSACTION] + set err [catch {db eval $eval_str } errStat] + if { $err } { + htmlErrorMsg $errStat + dbg "the following error happen: $errStat" msg_level_critical + } + db close } else { htmlHeaderDBSelector |