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1、ABAP 基本语法学习关键语句的写法内表建立过程：1、声明一个结构体2、用声明好的结构体作为工作区，声明一个内表内表名称 like standard table of 结构体名称，内表名称 like sorted table of 结构体名称，内表名称 like harshed table of 结构体名称。后面可以用到 with 选项来进行关键字的声明。基本语法如下：DATA itab TYPE tabkind OF REF TO type | LIKE tabkind OF dobj WITH key INITIAL SIZE n WITH HEADER LINE VALUE IS INI
2、TIAL READ-ONLY.DATA rtab TYPE RANGE OF type|LIKE RANGE OF dobj INITIAL SIZE n WITH HEADER LINE VALUE IS INITIAL READ-ONLY.此语句可以定义一个范围表，在操作数据库时可以用来作为判断数据选择的条件描述。3、向内表中插入数据，插入数据可以用 insert 数据 into 内表语句或者是 append数据 to 内表语句。可以插入整个内表到另一内表 insert lines of 内表名称 into table 另一内表名称。亦可以进行累加插入：collect 数据 into 内表
3、名称。相同的数据进行累积。4、修改内表数据，利用 modify 关键字，modify 内表名称 from 数据（用结构体表示的数据） 。可以修改多行，modify 内表名称 from 数据 transporting 关键字 where 条件。5、读内表数据的几种操作方法：用 Include 来构造一个结构体INCLUDE TYPE struc_type | STRUCTURE struc AS name RENAMING WITH SUFFIX suffix.TYPES: BEGIN OF t_day, work TYPE c LENGTH 8, free TYPE c LENGTH 16,
4、END OF t_day. DATA BEGIN OF week. INCLUDE TYPE t_day AS monday RENAMING WITH SUFFIX _mon. INCLUDE TYPE t_day AS tuesday RENAMING WITH SUFFIX _tue. INCLUDE TYPE t_day AS wednesday RENAMING WITH SUFFIX _wed. DATA END OF week.可以用两种方式来访问结构体的内容：1、直接用结构体的名称来访问：week-monday-work, week-monday-free, week-tues
5、day-work2、用重新命名的后缀名字来访问：week-work_mon, week-free_mon, week-work_tue类对象的定义方式：CLASS class DEFINITION class_options. PUBLIC SECTION. components PROTECTED SECTION. components PRIVATE SECTION. components ENDCLASS.类对象的实现方式：CLASS class IMPLEMENTATION. . METHOD . . ENDMETHOD. . ENDCLASS.类对象的继承：CLASS class D
6、EFINITION LOCAL FRIENDS class1 class2 . intf1 intf2 .CLASS class DEFINITION DEFERRED PUBLIC | LOAD .PUBLIC INHERITING FROM superclass ABSTRACT FINAL CREATE PUBLIC|PROTECTED|PRIVATE SHARED MEMORY ENABLED FOR TESTING GLOBAL FRIENDS class1 class2 . intf1 intf2 .Deferred 关键字可以预先声明一个未被定义的类。类方法声明语句：METHOD
7、S meth ABSTRACT|FINAL IMPORTING parameters PREFERRED PARAMETER p EXPORTING parameters CHANGING parameters RAISING|EXCEPTIONS exc1 exc2 .METHODS meth ABSTRACT|FINAL IMPORTING parameters PREFERRED PARAMETER p RETURNING VALUE(r) typing RAISING|EXCEPTIONS exc1 exc2 .重载函数的声明方法：METHODS meth FINAL REDEFINI
8、TION。访问上级类的函数： super-meth（） 。大小写字母转换语句：TRANSLATE typ TO LOWER CASE.在 ABARP 程序中各种报错情况需要的例外类：CX_ROOT | |-CX_STATIC_CHECK | |-CX_DYNAMIC_CHECK | | | |-CX_SY_ARITHMETIC_ERROR | | | | | |-CX_SY_ZERODIVIDE | | | | | |-CX_SY_ARITHMETIC_OVERFLOW | | | | | |-CX_SY_ARG_OUT_OF_DOMAIN | | | | | |-CX_SY_PRECISIO
9、N_LOSS | | | |-CX_SY_ASSIGN_ERROR | | | | | |-CX_SY_ASSIGN_CAST_ERROR | | | | | | | |-CX_SY_ASSIGN_CAST_ILLEGAL_CAST | | | | | | | |-CX_SY_ASSIGN_CAST_UNKNOWN_TYPE | | | | | |-CX_SY_ASSIGN_OUT_OF_RANGE | | | |-CX_SY_CODEPAGE_CONVERTER_INIT | | | |-CX_SY_CONVERSION_ERROR | | | | | |-CX_SY_CONVERSION_
10、OVERFLOW | | | | | |-CX_SY_CONVERSION_NO_NUMBER | | | | | |-CX_SY_CONVERSION_CODEPAGE | | | | | |-CX_SY_CONVERSION_BASE64 | | | | | |-CX_SY_CONV_ILLEGAL_DATE_TIME | | | |-CX_SY_CREATE_ERROR | | | | | |-CX_SY_CREATE_OBJECT_ERROR | | | | | |-CX_SY_CREATE_DATA_ERROR | | | |-CX_SY_DATA_ACCESS_ERROR | |
11、| | | |-CX_SY_RANGE_OUT_OF_BOUNDS | | | | | |-CX_SY_TAB_RANGE_OUT_OF_BOUNDS | | | | | |-CX_SY_OFFSET_NOT_ALLOWED | | | |-CX_SY_DYN_CALL_ERROR | | | | | |-CX_SY_DYN_CALL_ILLEGAL_CLASS | | | | | |-CX_SY_DYN_CALL_ILLEGAL_FORM | | | | | |-CX_SY_DYN_CALL_ILLEGAL_FUNC | | | | | |-CX_SY_DYN_CALL_ILLEGAL_ME
12、THOD | | | | | |-CX_SY_DYN_CALL_PARAMETER_ERROR | | | | | |-CX_SY_DYN_CALL_EXCP_NOT_FOUND | | | | | |-CX_SY_DYN_CALL_ILLEGAL_TYPE | | | | | |-CX_SY_DYN_CALL_PARAM_MISSING | | | | | |-CX_SY_DYN_CALL_PARAM_NOT_FOUND | | | |-CX_SY_FILE_ACCESS_ERROR | | | | | |-CX_SY_FILE_AUTHORITY | | | | | |-CX_SY_FIL
13、E_CLOSE | | | | | |-CX_SY_FILE_IO | | | | | |-CX_SY_FILE_OPEN | | | | | |-CX_SY_FILE_OPEN_MODE | | | | | |-CX_SY_FILE_POSITION | | | | | |-CX_SY_FILE_TRUNCATE | | | |-CX_SY_FIND_INFINITE_LOOP | | | |-CX_SY_GEN_SOURCE_TOO_WIDE | | | |-CX_SY_IMPORT_MISMATCH_ERROR | | | | | |-CX_SY_IMPORT_FORMAT_ERROR | | | |-CX_SY_INVALID_REGEX | | | |-CX_SY_MATCHER | | | | | |-CX_SY_REGEX_TOO_COMPLEX | | | | | |-CX_SY_INVALID_REGEX | | | |-CX_SY_MOVE_CAST_ERROR | | | |-CX_SY_PROGRAM_NOT_FOUND | | | |-CX_SY_PROVIDE_EXCEPTION | | | | | |-CX_SY_PROVIDE_INTERVAL_OVERLAP | | |
