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05-21-2009, 05:09 AM
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Internal table in ABAP
Fields of Internal Table
*An internal table is a run time instance. It get created when program starts execution. *It get destroyed when program terminates. it has two different parts. HeaderLine(optional) & Body(Compulsory). *Any value that comes to or goes from interanal table , that travels through headerline.\ *A related program is . *declaration. data: begin of inernaltable occurs 0, x type c, y type i, end of itab. *initializing headerline internaltable-x = 'd'. internaltable-y = 34. *storing value into internal table appene internaltable . appene internaltable . appene internaltable . *reading internal table loop at itab . write: / internaltable-x, internaltable-y. "writes to output list endloop. ABAP Tips by : Abdul Sayeed Email : sayeed_mail2005@yahoo.com Fields of Internal Tables SY-TABIX Current line of an internal table. SY-TABIX is set by the statements below, but only for index tables. The field is either not set or is set to 0 for hashed tables. APPEND sets SY-TABIX to the index of the last line of the table, that is, it contains the overall number of entries in the table. COLLECT sets SY-TABIX to the index of the existing or inserted line in the table. If the table has the type HASHED TABLE, SY-TABIX is set to 0. LOOP AT sets SY-TABIX to the index of the current line at the beginning of each loop lass. At the end of the loop, SY-TABIX is reset to the value that it had before entering the loop. It is set to 0 if the table has the type HASHED TABLE. READ TABLE sets SY-TABIX to the index of the table line read. If you use a binary search, and the system does not find a line, SY-TABIX contains the total number of lines, or one more than the total number of lines. SY-INDEX is undefined if a linear search fails to return an entry. SEARCH SY-TFILL After the statements DESCRIBE TABLE, LOOP AT, and READ TABLE, SY-TFILL contains the number of lines in the relevant internal table. SY-TLENG After the statements DESCRIBE TABLE, LOOP AT, and READ TABLE, SY-TLENG contains the length of the lines in the relevant internal table. SY-TOCCU After the statements DESCRIBE TABLE, LOOP AT, and READ TABLE, SY-TLENG contains the initial amount of memory allocated to the relevant internal table. 
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