Hybrid Queries (from Fraktal SAS Programming): Unterschied zwischen den Versionen

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Wolf-Dieter Batz (Diskussion | Beiträge)
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Wolf-Dieter Batz (Diskussion | Beiträge)
autoreview, Bürokraten, editor, reviewer, Administratoren
12.497 Bearbeitungen
KKeine Bearbeitungszusammenfassung
 
(12 dazwischenliegende Versionen desselben Benutzers werden nicht angezeigt)
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[[Kategorie:Zazy]]
[[Kategorie:zazy]]
{{SeitenNavigation1
|links=xx_left.png
|zurück=Libname Engine (from Fraktal SAS Programming)
|rechts=xx_right.png
|vorwärts=Passthru SQL (from Fraktal SAS Programming)
|hoch=Duck_zazy_com.png
|übersicht=DBMS Interaction (from Fraktal SAS Programming)
}}


;1st Make SAS your SQL interpreter
== What is this? ==


proc sql;
The qualifying term ''"hybrid"'' denotes to the fact that a single piece of SQL code is processed by a number of systems that are integrated by appropriate middleware in a way that system borders are not visible when looking at the code.


;2nd Connect to the DBMS using your credentials stored in [[Macro Variables]]
We will use a maximum simplified task to be coded in SQL:
* A '''SAS dataset''' shall be created
* Data for which are kept in a '''DBMS table'''
* The DBMS talks '''ANSI SQL'''
* SAS can connect to the DBMS using '''SAS/Connect software'''
* The solution uses '''Proc SQL''' from Base SAS software


connect to oracle (user="&DB_USR." password="&DB_PWD." path="&DB_PTH.");


;3rd Start your query from inside SAS with a special from clause
== Documented Code Example ==


{| class="wikitable"
|-
! Code executed
! Function performed
|-
|
proc sql;
| '''Start the SQL interpreter inside SAS'''
|-
|
connect to oracle
(user="&DB_USR."
  password="&DB_PWD."
  path="&DB_PTH."
);
| '''Open connection to the DBMS using your credentials stored in [[Symbol_Tables_(from_Fraktal_SAS_Programming)|Macro Variables]]'''
|-
| 
create table my_sas_tab as
| '''Initiate creating your SAS table using ANSI SQL code'''
|-
| 
  select *  
  select *  
   from connection to oracle
   from connection to oracle
 
| '''Start your query from inside SAS with a special from clause'''
;4th Inside brackets use DBMS specific SQL
|-
 
|
  (
  (
  select *  
  select *  
   from ops$&DB_USR..&MYTABLE.
   from ops$&DB_USR..&MYTABLE.
  )
  )
 
| '''Inside brackets use DBMS specific SQL; [[Symbol_Tables_(from_Fraktal_SAS_Programming)|Macro Variables]] are resolved before code is passed to any processing system'''
;5th Execute the query by issuing the SAS statement terminator ';'
|-
 
|
  ;
  ;
| '''Execute the query by issuing the SAS statement terminator ';''''
|-
|
disconnect from oracle;
| '''Close connection to DBMS'''
|-
|
quit;
| '''Terminate SAS SQL interpreter status'''
|}


;6th Terminate connection to DBMS
{{SeitenNavigation1
 
|links=xx_left.png
disconnect to oracle;
|zurück=Libname Engine (from Fraktal SAS Programming)
 
|rechts=xx_right.png
;7th Terminate SAS SQL processor status
|vorwärts=Passthru SQL (from Fraktal SAS Programming)
 
|hoch=Duck_zazy_com.png
quit;
|übersicht=DBMS Interaction (from Fraktal SAS Programming)
}}

Aktuelle Version vom 2. Juli 2014, 14:32 Uhr

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Übersicht

Vorwärts

What is this?

The qualifying term "hybrid" denotes to the fact that a single piece of SQL code is processed by a number of systems that are integrated by appropriate middleware in a way that system borders are not visible when looking at the code.

We will use a maximum simplified task to be coded in SQL:

  • A SAS dataset shall be created
  • Data for which are kept in a DBMS table
  • The DBMS talks ANSI SQL
  • SAS can connect to the DBMS using SAS/Connect software
  • The solution uses Proc SQL from Base SAS software


Documented Code Example

Code executed Function performed 
proc sql;
Start the SQL interpreter inside SAS 
connect to oracle 
(user="&DB_USR." 
 password="&DB_PWD." 
 path="&DB_PTH."
);
Open connection to the DBMS using your credentials stored in Macro Variables 
create table my_sas_tab as
Initiate creating your SAS table using ANSI SQL code 
select * 
  from connection to oracle
Start your query from inside SAS with a special from clause 
(
select * 
  from ops$&DB_USR..&MYTABLE.
)
Inside brackets use DBMS specific SQL; Macro Variables are resolved before code is passed to any processing system 
;
Execute the query by issuing the SAS statement terminator ';' 
disconnect from oracle;
Close connection to DBMS 
quit;
Terminate SAS SQL interpreter status

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