Unit 8 Search Help 、 Unit 7 Views BC430 ABAP Dictionary Unit 8 Search Help 、 Unit 7 Views

1. Search Help

Input Help Requirements

Search Help 決定由哪個table或 view 找資料 (1) (2)

Search Help

Selection Method of a Search Help

Description of the Dialog Behavior

Interface of a Search Help

Search Help IMPORT (IMP)： screen上的值會作為一個限制條件，加入到 search help中 EXPORT (EXP)： 哪些欄位需要 返回值

Search Help search help 可放至 1. Table field 2. check table 3. data element

Search Help 若有好幾個search help，由左而右決定優先順序 1 2 3

Search Help 2. Collective search help： 把幾個 elementary search help 組合在一起

View as Selection Method of a Search Help

2. Views

Example: Structure of a View

(1) Join Condition 多餘的欄位

(2) Field Selection (Projection)

(3) Selection Condition

How are Tables linked to Views?

Structure of the View

Data Selection with Views (Open SQL)

Data Selection with Views You would get the same result using an Inner Join: SELECT C~CARRID C~CARRNAME P~CONNID P~CITYFROM P~CITYTO F~FLDATE F~SEATSMAX F~SEATSOCC INTO TABLE ITAB_FLIGHTS FROM ( SCARR AS C INNER JOIN SPFLI AS P ON C~CARRID = P~CARRID ) INNER JOIN SFLIGHT AS F ON F~CARRID = P~CARRID AND F~CONNID = P~CONNID WHERE CITYFROM IN SO_CITYF AND CITYTO IN SO_CITYT AND SEATSOCC < F~SEATSMAX ORDER BY C~CARRID P~CONNID F~FLDATE.

Inner and Outer Join

The Different Types and Usage of Views Database View are implement an inner join that is, only records of the primary table (selected via the join operation) for which the corresponding records of the secondary tables also exist are fetched. Maintenance View are implement an outer join Data from several tables can be summarized in a maintenance view and maintained collectively via this view. That is, the data is entered via the view and then distributed to the underlying tables by the system.

2.1 Database Views

Dynamic attachment of table fields in database views You can include entire tables in database views. In this case all the fields of the included table become fields of the view. If new fields are included in the table or existing fields are deleted, the view is automatically adjusted to this change. A new or deleted field is therefore automatically included in the view or deleted from it.

Dynamic attachment of table fields in database views

2.2 Maintenance Views Data that is distributed on more than one table often forms a logical unit (application object) The user usually is not interested in the technical implementation, such as the distribution of the data on several tables. You should be able to display, change and create the data of such an application object together. You can maintain complex application objects in a simple way using a maintenance view. The data is automatically distributed on the underlying database tables.

2.2 Maintenance Views

Maintenance view