Created by Jerry Wang, last modified on Apr 22, 2014

Function group IB_CRM_API里定义了一个类型为int的全局变量handle, 其作用是作为一个指向internal read / write buffer的pointer。

write / read buffer定义在下列的function group里:

使用下列report 测试:

PARAMETERS: id TYPE ibib-ibase OBLIGATORY DEFAULT '13835'.

DATA: ls_header      TYPE ibap_head1,
      lt_struc_tab   TYPE ibap_struc1_tab,
      ls_line        LIKE LINE OF lt_struc_tab,
      ls_comp        TYPE ibap_dat1,
      ls_comp_detail TYPE ibap_comp2.

ls_header-ibase = id.
CALL FUNCTION 'CRM_IBASE_GET_DETAIL'
  EXPORTING
    i_ibase_head      = ls_header
  IMPORTING
    e_struc_ibase_tab = lt_struc_tab
  EXCEPTIONS
    not_specified     = 1
    doesnt_exist      = 2
    no_authority      = 3.

CHECK sy-subrc = 0.

LOOP AT lt_struc_tab INTO ls_line.
  WRITE: / 'Component ID: ' , ls_line-instance COLOR COL_NEGATIVE.
  ls_comp-ibase = id.
  ls_comp-instance = ls_line-instance.
  CALL FUNCTION 'CRM_IBASE_COMP_GET_DETAIL'
    EXPORTING
      i_comp        = ls_comp
    IMPORTING
      e_comp_det    = ls_comp_detail
    EXCEPTIONS
      not_specified = 1
      doesnt_exist  = 2
      no_authority  = 3.

WRITE: / 'Component Description:' , ls_comp_detail-descr COLOR COL_POSITIVE.

ENDLOOP.

UI上有一个root IBASE 13835，里面包含13836和13837两个IBASE component。

在使用CRM_IBASE_GET_DETAIL获取IBASE detail时，首先要获得一个handler，其value 为1:

首先去IBIBHANDLE_TAB buffer table里的write buffer IBIB_PROC_TAB 尝试读取指定的IBASE信息，

读取失败，再尝试read buffer，仍然失败:

最后从DB table IBIB取值，然后将读取出的信息写入read buffer:

对于读取IBASE hierarchy的逻辑同理:

采用buffer class读取instance信息:

双击c_wa-r_engine->struc->G_R_STRUC_BUF查看read buffer和write buffer:

可以发现在read scenario里read buffer被填充，而write buffer为空:

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