Post on 21-Jan-2016
description
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ABAP Tables
Northern Arizona University
College of Business
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Database tables
To reference a database table inside an ABAP program the Tables identifier must be used.
Tables:
Sflight .
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Records - Revisited
Data:
Begin of Flight_Record ,
Carrid Like Sflight-Carrid ,
Connid Like Sflight-Connid ,
End of Flight_Record .
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Internal Tables
Data:
Begin of INT_Demo Occurs 100 ,
Carrid Like Sflight-Carrid ,
Connid Like Sflight-Connid ,
End of INT_Demo .
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Internal Tables
Data:
Begin of INT_Demo Occurs 100 ,
Include Structure Sflight ,
End of INT_Demo .
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Internal Table Structure
Header
Items
Header
Items
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Header Record
The header record is a temporary holding area.
The header contains data before it is written to the internal table (append).
The header contains data after an item has been read.
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Item Records
The item records are the internal table.
All usage of the items are via the header record.
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Selecting from an External Table
Select * from Sflight into Flight_Record.
Select Carrid Connid from Sflight into Flight_Record.
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Moving from the record to the header of the internal table.
Move:
Flight_Record-Carrid to INT_Demo-Carrid ,
Flight_Record-Connid to INT_Demo-Connid .
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Appending records from the header to the items.
Append INT_Demo.
The contents of the header record are added to the end of the items.
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Clearing the Header
Clear INT_Demo.
The Clear statement clears the header only, not the items.
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Clearing the Items
Refresh INT_Demo.
The Refresh statement purges the internal table of all data, but not the header.
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Sorting the Internal Table
Sort INT_Demo by Carrid Ascending SeatsOcc Descending .
Up to 50 fields can be sorted .
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Determining the number of items
Data: W_Lines type I ,
W_Cnt type I .
Describe INT_Demo Lines W_Lines .
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Looping through the table
While W_Cnt < W_Lines .
W_Cnt = W_Cnt + 1 .
Read Table INT_Demo Index W_Cnt .
. . . . . . .
EndWhile .
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Field Strings (Record)
Data:
Begin of INT_Key ,
City(10) type C ,
State(2) type C ,
End of INT_Key .
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Read with Key
Move ‘Flagstaff’ to City .
Move ‘AZ’ to State .
Read Table INT_Demo
with Key INT_Key .
Read Table INT_Demo
with Key INT_Key Binary Search .
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Loop At
Loop At INT_Demo .
whatever .
EndLoop .
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Loop At Where
Loop At INT_Demo Where condition .
whatever .
EndLoop .
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Modifying an item
Loop At INT_Demo .
(modify the header field(s)).
Modify INT_Demo Index sy-tabix .
Clear INT_Demo .
EndLoop .
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Deleting an item
Loop At INT_Demo .
If whatever .
Delete INT_Demo Index sy-tabix .
EndIf .
Clear INT_Demo.
EndLoop .