Re: MSSQL to PostgreSQL - Issue trying to generate unique ID using actual date - Mailing list pgsql-sql

On 3/17/2010 9:52 AM, Ignacio Balcarce wrote: <blockquote
cite="mid:000001cac5e1$8851dbe0$98f593a0$@balcarce@vivatia.com"type="cite"><style>
 
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--> </style><div class="Section1"><p class="MsoNormal"><span lang="EN-US">Hi all,</span><p class="MsoNormal"><span
lang="EN-US"> </span><pclass="MsoNormal"><span lang="EN-US">I am facing a problem trying to convert from MSSQL
procedureto PostgreSQL function. </span><p class="MsoNormal"><span lang="EN-US"> </span><p class="MsoNormal"
style=""><spanlang="EN-US" style="font-size: 10pt; font-family: "Courier New"; color: blue;">CREATE</span><span
lang="EN-US"style="font-size: 10pt; font-family: "Courier New";"> <span style="color: blue;">PROCEDURE</span> dbo<span
style="color:gray;">.</span>THUBAN_SP_GENERATEID</span><p class="MsoNormal" style=""><span lang="EN-US"
style="font-size:10pt; font-family: "Courier New";"> </span><p class="MsoNormal" style=""><span lang="EN-US"
style="font-size:10pt; font-family: "Courier New";">         @NEWID <span style="color: blue;">VARCHAR</span><span
style="color:gray;">(</span>20<span style="color: gray;">)</span>  <span style="color: blue;">OUTPUT</span></span><p
class="MsoNormal"style=""><span lang="EN-US" style="font-size: 10pt; font-family: "Courier New"; color:
blue;">AS</span><pclass="MsoNormal" style=""><span lang="EN-US" style="font-size: 10pt; font-family: "Courier New";
color:blue;"> </span><p class="MsoNormal" style=""><span lang="EN-US" style="font-size: 10pt; font-family: "Courier
New";color: blue;"> </span><p class="MsoNormal" style=""><span lang="EN-US" style="font-size: 10pt; font-family:
"CourierNew"; color: blue;"> </span><p class="MsoNormal" style=""><span lang="EN-US" style="font-size: 10pt;
font-family:"Courier New"; color: blue;"> </span><p class="MsoNormal" style=""><span lang="EN-US" style="font-size:
10pt;font-family: "Courier New";">        <span style="color: blue;">SET</span> @NEWID <span style="color:
gray;">=</span><span style="color: gray;">(</span></span><p class="MsoNormal" style=""><span lang="EN-US"
style="font-size:10pt; font-family: "Courier New";">                        <span style="color: blue;">SELECT</span>
<spanstyle="color: fuchsia;">REPLACE</span><span style="color: gray;">(</span><span style="color:
fuchsia;">SUBSTRING</span><spanstyle="color: gray;">(</span><span style="color: fuchsia;">CONVERT</span><span
style="color:gray;">(</span><span style="color: blue;">CHAR</span><span style="color: gray;">(</span>10<span
style="color:gray;">),</span><span style="color: fuchsia;">GETDATE</span><span style="color: gray;">(),</span>20 <span
style="color:gray;">),</span>1<span style="color: gray;">,</span>10<span style="color: gray;">),</span><span
style="color:red;">'-'</span><span style="color: gray;">,</span><span style="color: red;">''</span><span style="color:
gray;">)</span></span><pclass="MsoNormal" style=""><span lang="EN-US" style="font-size: 10pt; font-family: "Courier
New";">                               <span style="color: gray;">+</span> <span style="color:
fuchsia;">CAST</span><spanstyle="color: gray;">(</span><span style="color: fuchsia;">REPLICATE</span><span
style="color:gray;">(</span>0<span style="color: gray;">,</span>8<span style="color: gray;">-</span><span style="color:
fuchsia;">LEN</span><span style="color: gray;">(</span><span style="color: fuchsia;">ISNULL</span><span style="color:
gray;">(</span><spanstyle="color: fuchsia;">CAST</span><span style="color: gray;">(</span><span style="color:
fuchsia;">SUBSTRING</span><spanstyle="color: gray;">(</span><span style="color: fuchsia;">MAX</span><span style="color:
gray;">(</span>SEQ_ID<spanstyle="color: gray;">),</span>9<span style="color: gray;">,</span>8<span style="color:
gray;">)</span><span style="color: blue;">AS</span></span><p class="MsoNormal" style=""><span lang="EN-US"
style="font-size:10pt; font-family: "Courier New";">INTEGER<span style="color: gray;">),</span>0<span style="color:
gray;">)</span><span style="color: gray;">+</span> 1<span style="color: gray;">))</span> <span style="color:
blue;">AS</span><span style="color: blue;">VARCHAR</span><span style="color: gray;">)</span></span><p class="MsoNormal"
style=""><spanlang="EN-US" style="font-size: 10pt; font-family: "Courier New";">                                       
<spanstyle="color: gray;">+</span> <span style="color: fuchsia;">CAST</span><span style="color: gray;">(</span><span
style="color:fuchsia;">ISNULL</span><span style="color: gray;">(</span><span style="color: fuchsia;">CAST</span><span
style="color:gray;">(</span><span style="color: fuchsia;">SUBSTRING</span><span style="color: gray;">(</span><span
style="color:fuchsia;">MAX</span><span style="color: gray;">(</span>SEQ_ID<span style="color: gray;">),</span>9<span
style="color:gray;">,</span>8<span style="color: gray;">)</span> <span style="color: blue;">AS</span> INTEGER<span
style="color:gray;">),</span>0<span style="color: gray;">)</span> <span style="color: gray;">+</span> 1  <span
style="color:blue;">AS</span></span><p class="MsoNormal" style=""><span lang="EN-US" style="font-size: 10pt;
font-family:"Courier New"; color: blue;">VARCHAR</span><span lang="EN-US" style="font-size: 10pt; font-family: "Courier
New";color: gray;">)</span><p class="MsoNormal" style=""><span lang="EN-US" style="font-size: 10pt; font-family:
"CourierNew";">                        <span style="color: blue;">FROM</span> THUBAN_SEQ</span><p class="MsoNormal"
style=""><spanlang="EN-US" style="font-size: 10pt; font-family: "Courier New";">                        <span
style="color:blue;">WHERE</span> <span style="color: fuchsia;">SUBSTRING</span><span style="color:
gray;">(</span>SEQ_ID<spanstyle="color: gray;">,</span>1<span style="color: gray;">,</span>8<span style="color:
gray;">)=</span></span><pclass="MsoNormal" style=""><span lang="EN-US" style="font-size: 10pt; font-family: "Courier
New";color: fuchsia;">REPLACE</span><span lang="EN-US" style="font-size: 10pt; font-family: "Courier New"; color:
gray;">(</span><spanlang="EN-US" style="font-size: 10pt; font-family: "Courier New"; color:
fuchsia;">SUBSTRING</span><spanlang="EN-US" style="font-size: 10pt; font-family: "Courier New"; color:
gray;">(</span><spanlang="EN-US" style="font-size: 10pt; font-family: "Courier New"; color:
fuchsia;">CONVERT</span><spanlang="EN-US" style="font-size: 10pt; font-family: "Courier New"; color:
gray;">(</span><spanlang="EN-US" style="font-size: 10pt; font-family: "Courier New"; color: blue;">CHAR</span><span
lang="EN-US"style="font-size: 10pt; font-family: "Courier New"; color: gray;">(</span><span lang="EN-US"
style="font-size:10pt; font-family: "Courier New";">10<span style="color: gray;">),</span><span style="color:
fuchsia;">GETDATE</span><spanstyle="color: gray;">(),</span>20 <span style="color: gray;">),</span>1<span style="color:
gray;">,</span>10<spanstyle="color: gray;">),</span><span style="color: red;">'-'</span><span style="color:
gray;">,</span><spanstyle="color: red;">''</span><span style="color: gray;">)</span></span><p class="MsoNormal"
style=""><spanlang="EN-US" style="font-size: 10pt; font-family: "Courier New";">                        <span
style="color:gray;">)</span></span><p class="MsoNormal" style=""><span lang="EN-US" style="font-size: 10pt;
font-family:"Courier New"; color: gray;"> </span><p class="MsoNormal" style=""><span lang="EN-US" style="font-size:
10pt;font-family: "Courier New"; color: gray;"> </span><p class="MsoNormal" style=""><span lang="EN-US"
style="font-size:10pt; font-family: "Courier New";">        <span style="color: blue;">INSERT</span> <span
style="color:blue;">INTO</span> THUBAN_SEQ <span style="color: blue;">VALUES</span> <span style="color:
gray;">(</span>@NEWID<spanstyle="color: gray;">)</span></span><p class="MsoNormal" style=""><span lang="EN-US"
style="font-size:10pt; font-family: "Courier New"; color: gray;"> </span><p class="MsoNormal" style=""><span
lang="EN-US"style="font-size: 10pt; font-family: "Courier New";">        <span style="color: blue;">SELECT</span>
@NEWID<span style="color: blue;">AS</span> ITEM_ID<span style="color: gray;">;</span></span><p class="MsoNormal"><span
style="font-size:10pt; font-family: "Courier New";">GO</span><p class="MsoNormal"><span style="font-size: 10pt;
font-family:"Courier New";"> </span><span lang="EN-US"></span></div></blockquote><br /><br /> I surprised this works in
MSSQL<br/><br /> CREATE SEQUENCE THUBAN_SEQ<br />   INCREMENT 1<br />   MINVALUE 1<br />   MAXVALUE
9223372036854775807<br/>   START 1<br />   CACHE 1;<br /><br /><br /> Now for the function to generate the ID with the
dateleading <br /><br /><p class="MsoNormal"><span lang="EN-US">CREATE OR REPLACE FUNCTION THUBAN_SP_GENERATEID()<br
/></span><spanlang="EN-US">RETURNS VARCHAR</span><p class="MsoNormal"><span lang="EN-US">AS $$<br /></span><span
lang="EN-US"></span><spanlang="EN-US">BEGIN</span><br /><br /> --now we get the next value from the thuban_seq and add
thedate to the  front.  <br /><br /> return  to_char( current_timestamp,   'MMDDYYYY')::varchar ||
nextval('THUBAN_SEQ')::varchar<br/><p class="MsoNormal"><span lang="EN-US">                </span><p
class="MsoNormal"><spanlang="EN-US">RETURN NEWID;</span><p class="MsoNormal"><span lang="EN-US">END;</span><span
lang="EN-US">$$LANGUAGE plpgsql;</span><br /><br /> If this is not what your after you need to give more information
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