63 lines
2.8 KiB
Haskell
63 lines
2.8 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE RecordWildCards #-}
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{-# LANGUAGE CPP #-}
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{-# LANGUAGE PatternSynonyms #-}
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module Ringo.Generator.Populate.Dimension (dimensionTablePopulateSQL) where
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#if MIN_VERSION_base(4,8,0)
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#else
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import Control.Applicative ((<$>))
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#endif
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import Control.Monad.Reader (Reader, asks)
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import Database.HsSqlPpp.Syntax (Statement, QueryExpr(..), Distinct(..), makeSelect, JoinType(..))
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import Data.Maybe (fromJust)
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import Data.Text (Text)
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import Ringo.Extractor.Internal
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import Ringo.Generator.Internal
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import Ringo.Generator.Sql
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import Ringo.Types
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dimensionTablePopulateSQL :: TablePopulationMode -> Fact -> TableName -> Reader Env Text
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dimensionTablePopulateSQL popMode fact dimTableName =
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ppStatement <$> dimensionTablePopulateStmt popMode fact dimTableName
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dimensionTablePopulateStmt :: TablePopulationMode -> Fact -> TableName -> Reader Env Statement
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dimensionTablePopulateStmt popMode fact dimTableName = do
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Settings {..} <- asks envSettings
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tables <- asks envTables
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defaults <- asks envTypeDefaults
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let factTable = fromJust $ findTable (factTableName fact) tables
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colMapping = dimColumnMapping settingDimPrefix fact dimTableName
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selectCols = [ flip sia (nmc cName) $ coalesceColumn defaults (factTableName fact) col
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| (_, cName) <- colMapping
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, let col = fromJust . findColumn cName $ tableColumns factTable ]
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timeCol = head ([ cName | DimTimeV cName <- factColumns fact ] :: [ColumnName])
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isNotNullC = parens . foldBinop "or" . map (postop "isnotnull" . ei . snd) $ colMapping
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selectWhereC = Just . foldBinop "and" $
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[ isNotNullC, binop "<" (ei timeCol) placeholder ] ++
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[ binop ">=" (ei timeCol) placeholder | popMode == IncrementalPopulation ]
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selectC = makeSelect
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{ selDistinct = Distinct
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, selSelectList = sl selectCols
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, selTref = [tref $ factTableName fact]
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, selWhere = selectWhereC
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}
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iTableName = suffixTableName popMode settingTableNameSuffixTemplate dimTableName
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insertC = insert iTableName (map fst colMapping) $ case popMode of
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FullPopulation -> selectC
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IncrementalPopulation -> let alias = "x" in
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makeSelect
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{ selSelectList = sl [si $ qstar alias]
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, selTref =
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[ tjoin (subtrefa alias selectC) LeftOuter (tref dimTableName) . Just $
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foldBinop "and" [ binop "=" (eqi dimTableName c1) (eqi alias c2) | (c1, c2) <- colMapping ] ]
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, selWhere =
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Just . foldBinop "and" . map (postop "isnull" . eqi dimTableName . fst) $ colMapping
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}
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return insertC
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