Обсуждение: Need help with CASE statement in Function
<div class="Section1"><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial">Dear friends,</span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial">I am a new user to postgreSQL and really need help to solve my “stupid ?” problem.</span></font><p class="MsoNormal"><fontface="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial">I have created function with 4 arguments like this :</span></font><p class="MsoNormal"><font face="Arial"size="2"><span style="font-size:10.0pt; font-family:Arial"> </span></font><p class="MsoNormal"><font face="Courier New" size="2"><span style="font-size:10.0pt; font-family:"Courier New"">CREATE OR REPLACE FUNCTION "public"."fHistoryCard" (begdate date, enddate date, ProductID varchar,storeID varchar) RETURNS SETOF "public"."tbltrans" AS</span></font><p class="MsoNormal"><font face="Courier New"size="2"><span style="font-size:10.0pt; font-family:"Courier New"">$body$</span></font><p class="MsoNormal"><font face="Courier New" size="2"><span style="font-size:10.0pt; font-family:"Courier New"">/* New function body */</span></font><p class="MsoNormal"><font face="Courier New" size="2"><spanstyle="font-size:10.0pt; font-family:"Courier New""> </span></font><p class="MsoNormal"><font face="Courier New" size="2"><span style="font-size:10.0pt; font-family:"Courier New"">select * from tbltrans</span></font><p class="MsoNormal"><font face="Courier New" size="2"><spanstyle="font-size:10.0pt; font-family:"Courier New"">where tbltrans."Date” between $1 and $2</span></font><p class="MsoNormal"><font face="CourierNew" size="2"><span style="font-size:10.0pt; font-family:"Courier New"">and upper(tbltrans."ProductID")=upper($3)</span></font><p class="MsoNormal"><b><font face="CourierNew" size="2"><span style="font-size: 10.0pt;font-family:"Courier New";font-weight:bold">and tbltrans."StoreID"=$4</span></font></b><p class="MsoNormal"><fontface="Courier New" size="2"><span style="font-size:10.0pt; font-family:"Courier New"">order by tbltrans."Tanggal";</span></font><p class="MsoNormal"><font face="Courier New" size="2"><spanstyle="font-size:10.0pt; font-family:"Courier New"">$body$</span></font><p class="MsoNormal"><font face="Courier New" size="2"><span style="font-size:10.0pt; font-family:"Courier New"">LANGUAGE 'sql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;</span></font><p class="MsoNormal"><fontface="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial">---------------------</span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial">My Question is : How to make argument 4 optional ? When IS NULL the function will show all transactionbetween date $1 and $2 and product ID=$3 </span></font><p class="MsoNormal"><font face="Arial" size="2"><spanstyle="font-size:10.0pt; font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial">But when $4 is not null then the fucntion will show all transaction between date $1 and $2 and productID=$3 AND STOREID=$4.</span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial">I really appreciate any suggestions.</span></font><p class="MsoNormal"><font face="Arial" size="2"><spanstyle="font-size:10.0pt; font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial">Thanks a lot.</span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial">Hengky</span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt; font-family:Arial"> </span></font></div>
On 10/3/07, Hengky Lie <hengkyliwandouw@gmail.com> wrote: > Dear friends, > I am a new user to postgreSQL and really need help to solve my "stupid ?" > problem. > > I have created function with 4 arguments like this : > > CREATE OR REPLACE FUNCTION "public"."fHistoryCard" (begdate date, enddate > date, ProductID varchar, storeID varchar) RETURNS SETOF "public"."tbltrans" > AS > > $body$ > /* New function body */ > select * from tbltrans > where tbltrans."Date" between $1 and $2 > and upper(tbltrans."ProductID")=upper($3) > and tbltrans."StoreID"=$4 > order by tbltrans."Tanggal"; > $body$ > > LANGUAGE 'sql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER; > --------------------- > My Question is : How to make argument 4 optional ? When IS NULL the function > will show all transaction between date $1 and $2 and product ID=$3 > But when $4 is not null then the fucntion will show all transaction between > date $1 and $2 and product ID=$3 AND STOREID=$4. Try something like: CREATE OR REPLACE FUNCTION "public"."fHistoryCard" (begdate date, enddate date, ProductID varchar, storeID varchar) RETURNS SETOF "public"."tbltrans" AS $body$ /* New function body */ SELECT * FROM tbltrans WHERE tbltrans."Date" between $1 and $2 AND upper(tbltrans."ProductID")=upper($3) AND ($4 IS NULL OR tbltrans."StoreID"=$4) ORDER BY tbltrans."Tanggal"; $body$ LANGUAGE 'sql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER; In other words, change:tbltrans."StoreID"=$4 into($4 IS NULL OR tbltrans."StoreID"=$4) Haven't tested it, but should work fine. Regards, Dawid
--- Hengky Lie <hengkyliwandouw@gmail.com> wrote: > My Question is : How to make argument 4 optional ? When IS NULL the function > will show all transaction between date $1 and $2 and product ID=$3 Could you simply overload your function by having two functions? One with arguement 4 and one without? Regards, Richard Broersma Jr.