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powercenter學(xué)習(xí)總結(jié)(存儲(chǔ)版)

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【正文】 ement的父元素.l Normalized類型的可以有相同的view root.l A view cannot contain manytomany relationshipsl Two views can have the same view row in an XML source or XML Parser transformation. l The view row element must be the lowest multipleoccurring element in the view. A view cannot contain manytomany relationships.l If you add a multipleoccurring element to a view with no other multipleoccurring element, you change the view row to the new element by default. If the view already has a multipleoccurring element, you cannot add another multipleoccurring element.l You do not need to specify a view row when you create an empty view. However, as soon as you add a column to the view, the Designer creates the view row. This is true even if you add just the primary key. l You can change a view row at a later time, but you cannot change a view root unless there are no schema ponents in the view. l You can specify a view row that consists of a pivoted element, such as:Product/Order[2]/Customer 7. Pivoting Columns(列旋轉(zhuǎn)) 可以實(shí)現(xiàn)多行轉(zhuǎn)成一列,比如 Using MultipleLevel Pivots(多層旋轉(zhuǎn))STORE Realtime processing. 可以傳遞BLOBs Data from messaging systems.CUSTNAMEThe XPath STORE/PRODUCT[2]/ORDER[1]/ORDERNAME refers to the ordername for the first order for the second product in the store. The XPath STORE/PRODUCT[2]/ORDER/CUSTOMER[1]refers to the first customer for all orders of the second product. 8. XML SQ的一些注意事項(xiàng) 同個(gè)SQ的兩個(gè)組不能直接link進(jìn)入同個(gè)Target,需中間做些改變,比如Join后 外的TF 可以手動(dòng)修改PK的值. 兩個(gè)Group進(jìn)入Joiner之前必須把Joiner的inputsort Synchronizing XML Definitions可以刷新XML Source的定義XML MidStream作用:用于抽取和產(chǎn)生XML使用簡介:9. XML Parser transformation. The XML Parser transformation reads XML from one input port and outputs data to one or more groups.10. XML Generator transformation. The XML Generator transformation reads data from one or more sources and generates XML. The XML Generator transformation has a single output port. 2. XML transformations 支持以下功能:ORDER+]View Rows的使用原則:View Row就是你要顯示的那個(gè)元素,比如一個(gè)雇員有許多電話與薪水,但是你把薪水設(shè)置為View Row則你只能選擇一個(gè)電話號(hào)碼。Part3. 相同之處a) 不能使用PL/SQL,TSQL等DBMS專用語言.b) 無CodePage指定則使用服務(wù)器c) 不支持目標(biāo)表有Triggerd) 支持輸入輸出功能,輸出端口一般在輸入端口自動(dòng)加后綴_output4. 不同之處a) SM支持用分號(hào)分割多個(gè)語句,可以同行執(zhí)行,QM的傳入端口模式下則不支持.,如果是直接在TF Query 寫語句就可以.b) QM支持綁定變量,SM不支持。比如可以把session 執(zhí)行的時(shí)間寫入到某些地方,獲取執(zhí)行電腦的ip地址等用處. Strategy1. Powercenter的更新策略包括兩個(gè)方面:A. 在Mapping中:用Update Strategy Transformation標(biāo)識(shí)行為Insert,Update,Delete或者Reject;B. 在Session中:配置Treat source row as 屬性(Insert,Update,Delete或者Data driven),配置Target的屬性(Insert,Update [as Update](只是更新) | [as Insert](把更新視為新增) | [else Insert](先更新,更新不到則新增) ,Delete,Truncate target table option);2. 在Update Strategy Expression中可以輸入常量(DD_INSERT, DD_UPDATE, DD_DELETE, DD_REJECT)或者數(shù)字值 (0,1,2,3),其它數(shù)字值被解析為0,可以用IIF或者DECODE函數(shù)構(gòu)建邏輯表達(dá)式來區(qū)別每一行的更新策略;3. Forward Rejected Rows:勾選時(shí)被Rejected的行會(huì)存入對(duì)應(yīng)Target配置的Reject文件中去,不選時(shí),可能會(huì)寫入Session Log中去,根椐當(dāng)前Transformation的Tracing Level的屬性來決定;如果在會(huì)話屬性中配置了出錯(cuò)行日志屬性,則不會(huì)生成Reject文件;1. 用來執(zhí)行單行計(jì)算,在計(jì)算表達(dá)式中,可以使用輸入端口,輸入/輸出端口,可以使用函數(shù)以及非連接的Lookup,也可以使用變量端口;2. 數(shù)據(jù)來源只能一個(gè)1. Lookup根椐輸入值從數(shù)據(jù)庫或者平面文件中查找數(shù)據(jù);2. Lookup分為連接型和非連接型的:A. 連接型的可以傳送多個(gè)返回值給其它的Transformation,非連接型的只能有一個(gè)返回端口,在表達(dá)式中用Lookup函數(shù)(:LKP())來調(diào)用;B. 連接型的可以利用到默認(rèn)值,當(dāng)沒有匹配記錄時(shí),非連接型的總是返回空;3. Lookup可以配置成使用CACHE,對(duì)平面文件這項(xiàng)必選,Informatica Server在條件欄位上建立索引CACHE,在其它欄位
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