diff options
Diffstat (limited to 'lib/gitlab/database/date_time.rb')
| -rw-r--r-- | lib/gitlab/database/date_time.rb | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/lib/gitlab/database/date_time.rb b/lib/gitlab/database/date_time.rb new file mode 100644 index 00000000000..b6a89f715fd --- /dev/null +++ b/lib/gitlab/database/date_time.rb @@ -0,0 +1,27 @@ +module Gitlab + module Database + module DateTime + # Find the first of the `end_time_attrs` that isn't `NULL`. Subtract from it + # the first of the `start_time_attrs` that isn't NULL. `SELECT` the resulting interval + # along with an alias specified by the `as` parameter. + # + # Note: For MySQL, the interval is returned in seconds. + # For PostgreSQL, the interval is returned as an INTERVAL type. + def subtract_datetimes(query_so_far, end_time_attrs, start_time_attrs, as) + diff_fn = if Gitlab::Database.postgresql? + Arel::Nodes::Subtraction.new( + Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(end_time_attrs)), + Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(start_time_attrs))) + elsif Gitlab::Database.mysql? + Arel::Nodes::NamedFunction.new( + "TIMESTAMPDIFF", + [Arel.sql('second'), + Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(start_time_attrs)), + Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(end_time_attrs))]) + end + + query_so_far.project(diff_fn.as(as)) + end + end + end +end |