Sort Records in a User-defined Order
【Question】
PRODUCT_ID, PRODUCT_NAME
100 Nokia
200 IPhone
300 Samsung
400 LG
I want to display the records like below:
PRODUCT_ID, PRODUCT_NAME
300 Samsung
200 IPhone
100 Nokia
400 LG
【Answer】
A user-defined sorting condition is always temporary and sometime long. To handle this type of scenarios, SPL is an expert with simple and easy to understand code:
| A |
|
| 1 |
=db.query(“select * from t1”) |
| 2 |
=A1.align@s([300,200,100,400],PRODUCT_ID) |
A2: align() function sorts A1’s table sequence according to the specified order (align it to the specified sequence). A user-defined sorting condition (here [300,200,100,400]) can be an external parameter (list, for example), then A2 can be rewritten as A1.align@s(list,PRODUCT_ID).
esProc offers JDBC interface to let another program to call an SPL script in the way they call a database result set. To learn more about the invocation, refer to How to Call an SPL Script in Java.
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