VSAM文件纪录的浏览:
对VSAM文件可以从头开始，依次查询各条纪录，这要用到4条CICS命令：STARTBR, READNEXT, READPREV, ENDBR, 依次为开始浏览，读下
条纪录，读前条纪录和结束浏览命令。
这些命令使用的选项含义与READ命令大致相同，但增加了一条REQID，这个选项用来使程序能对一个文件同时发动多个查询，各个查询可
以有不同的当前位置。在STARTBR时，返回打开的浏览的REQID，在后面的命令中使用REQID指明进行那个浏览的操作。程序通过检查命令
的返回码来判断文件结束等情况。
STARTBR FILE('SBVSAM2') RIDFLD(&KEY)
STATUS: ABOUT TO EXECUTE COMMAND NAME=
EXEC CICS STARTBR
FILE( 'SBVSAM2 ' )
< SYSID() >
RIDFLD( 'CITI' )
< KEYLENGTH() < GENERIC > >
< REQID( +00000 ) >
< RBA | RRN | DEBREC | DEBKEY >
< GTEQ | EQUAL >
PF 1 HELP 2 HEX 3 END 4 EIB 5 VAR 6 USER 7 SBH 8 SFH 9 MSG 10 SB 11 SF
READNEXT FILE('SBVSAM2') RIDFLD(&KEY)
STATUS: ABOUT TO EXECUTE COMMAND NAME=
EXEC CICS READNEXT
FILE( 'SBVSAM2 ' )
< SYSID() >
( SET() | INTO() )
< LENGTH() >
RIDFLD( 'CITI' )
< KEYLENGTH() >
< REQID( +00000 ) >
< RBA | RRN >
< UNCOMMITTED | CONSISTENT | REPEATABLE | UPDATE TOKEN() >
< NOSUSPEND >
PF 1 HELP 2 HEX 3 END 4 EIB 5 VAR 6 USER 7 SBH 8 SFH 9 MSG 10 SB 11 SF
READNEXT FILE('SBVSAM2') RIDFLD(&KEY)
STATUS: COMMAND EXECUTION COMPLETE NAME=
EXEC CICS READNEXT
FILE( 'SBVSAM2 ' )
< SYSID() >
( SET() | INTO( 'ISSC BALAACCMF39778173' ) )
< LENGTH( +00023 ) >
RIDFLD( 'ISSC' )
< KEYLENGTH() >
< REQID( +00000 ) >
< RBA | RRN >
< UNCOMMITTED | CONSISTENT | REPEATABLE | UPDATE TOKEN() >
< NOSUSPEND >
RESPONSE: NORMAL EIBRESP=+0000000000 EIBRESP2=+0000000000
READNEXT FILE('SBVSAM2') RIDFLD(&KEY)
STATUS: COMMAND EXECUTION COMPLETE NAME=
EXEC CICS READNEXT
FILE( 'SBVSAM2 ' )
< SYSID() >
( SET() | INTO( '' ) )
< LENGTH( +00000 ) >
RIDFLD( 'ISSC' )
< KEYLENGTH() >
< REQID( +00000 ) >
< RBA | RRN >
< UNCOMMITTED | CONSISTENT | REPEATABLE | UPDATE TOKEN() >
< NOSUSPEND >
RESPONSE: ENDFILE EIBRESP=+0000000020 EIBRESP2=+0000000090
PF 1 HELP 2 HEX 3 END 4 EIB 5 VAR 6 USER 7 SBH 8 SFH 9 MSG 10 SB 11 SF
READPREV FILE('SBVSAM2') RIDFLD(&KEY)
STATUS: ABOUT TO EXECUTE COMMAND NAME=
EXEC CICS READPREV
FILE( 'SBVSAM2 ' )
< SYSID() >
( SET() | INTO() )
< LENGTH() >
RIDFLD( 'ISSC' )
< KEYLENGTH() >
< REQID( +00000 ) >
< RBA | RRN >
< UNCOMMITTED | CONSISTENT | REPEATABLE | UPDATE TOKEN() >
< NOSUSPEND >
PF 1 HELP 2 HEX 3 END 4 EIB 5 VAR 6 USER 7 SBH 8 SFH 9 MSG 10 SB 11 SF
READPREV FILE('SBVSAM2') RIDFLD(&KEY)
STATUS: COMMAND EXECUTION COMPLETE NAME=
EXEC CICS READPREV
FILE( 'SBVSAM2 ' )
< SYSID() >
( SET() | INTO( 'ISSC BALAACCMF39778173' ) )
< LENGTH( +00023 ) >
RIDFLD( 'ISSC' )
< KEYLENGTH() >
< REQID( +00000 ) >
< RBA | RRN >
< UNCOMMITTED | CONSISTENT | REPEATABLE | UPDATE TOKEN() >
< NOSUSPEND >
RESPONSE: NORMAL EIBRESP=+0000000000 EIBRESP2=+0000000000
PF 1 HELP 2 HEX 3 END 4 EIB 5 VAR 6 USER 7 SBH 8 SFH 9 MSG 10 SB 11 SF
VSAM文件纪录更新:
CICS使用REWRITE命令来更改数据，REWRITE命令一定要跟在一个READ UPDATE命令之后，而且KSDS的KEY是不能改变的。REWRITE命令
的选项前面都介绍过了，它的异常情况也与READ大致相同，但多了以下几项：
LENGERR：写入纪录的长度没有指定或太长
NOSPACE： 文件空间不足，可能的原因是文件中变长纪录长度增加了
INVREQ： 多由以下原因造成：在REWITE一个记录前，没有运行过READ UPDATE命令
ILLOGIC： 其他VSAM文件操作错误。这种情况下可以通过检测EIBRCODE字段来判断错误种类：在EIBRCODE中，第二个字节为VSAM
错误码。具体代码可以到VSAM代码手册中查询。
READ FILE('SBVSAM2') RIDFLD('ISSC') UPDATE
STATUS: ABOUT TO EXECUTE COMMAND NAME=
EXEC CICS READ
FILE( 'SBVSAM2 ' )
< SYSID() >
( SET() | INTO() )
< LENGTH() >
RIDFLD( 'ISSC' )
< KEYLENGTH() < GENERIC > >
< RBA | RRN | DEBREC | DEBKEY >
< GTEQ | EQUAL >
< UNCOMMITTED | CONSISTENT | REPEATABLE | UPDATE < TOKEN() > >
< NOSUSPEND >
PF 1 HELP 2 HEX 3 END 4 EIB 5 VAR 6 USER 7 SBH 8 SFH 9 MSG 10 SB 11 SF
REWRITE FILE('SBVSAM2') FROM('ISSC BALAACCMF39778173')
STATUS: ABOUT TO EXECUTE COMMAND NAME=
EXEC CICS REWRITE
FILE( 'SBVSAM2 ' )
< SYSID() >
FROM( 'ISSC BALAACCMF39778173' )
< LENGTH( +00023 ) >
< TOKEN() >
< NOSUSPEND >
PF 1 HELP 2 HEX 3 END 4 EIB 5 VAR 6 USER 7 SBH 8 SFH 9 MSG 10 SB 11 SF
REWRITE FILE('SBVSAM2') FROM('ISSC BALAACCMF39778173')
STATUS: COMMAND EXECUTION COMPLETE NAME=
EXEC CICS REWRITE
FILE( 'SBVSAM2 ' )
< SYSID() >
FROM( 'ISSC BALAACCMF39778173' )
< LENGTH( +00023 ) >
< TOKEN() >
< NOSUSPEND >
RESPONSE: NORMAL EIBRESP=+0000000000 EIBRESP2=+0000000000
PF 1 HELP 2 HEX 3 END 4 EIB 5 VAR 6 USER 7 SBH 8 SFH 9 MSG 10 SB 11 SF
ENDBR FILE('SBVSAM2')
STATUS: COMMAND EXECUTION COMPLETE NAME=
EXEC CICS ENDBR
FILE( 'SBVSAM2 ' )
< SYSID() >
< REQID( +00000 ) >
RESPONSE: NORMAL EIBRESP=+0000000000 EIBRESP2=+0000000000
PF 1 HELP 2 HEX 3 END 4 EIB 5 VAR 6 USER 7 SBH 8 SFH 9 MSG 10 SB 11 SF
添加VSAM文件纪录：
CICS使用WRITE命令来向VSAM文件写入纪录。命令选项含义与前面的介绍相同。当我们需要按键值的升序排列插入多个纪录时，须使用
MASSINSERT选项，每个WRITE命令都要包含这个选项，要终止MASSINSERT，可通过UNLOCK命令来实现。
WRITE FILE('SBVSAM2') FROM( 'ISSC BALADBDMF39778173' ) RIDFLD('ISSC')
STATUS: ABOUT TO EXECUTE COMMAND NAME=
EXEC CICS WRITE FILE( 'SBVSAM2 ' )
< SYSID() >
FROM( 'ISSC BALADBDMF39778173' )
< LENGTH( +00023 ) >
RIDFLD( 'ISSC' )
< KEYLENGTH() >
< RBA | RRN >
< MASSINSERT >
< NOSUSPEND >
PF 1 HELP 2 HEX 3 END 4 EIB 5 VAR 6 USER 7 SBH 8 SFH 9 MSG 10 SB 11 SF
WRITE FILE('SBVSAM2') FROM( 'ISSC BALADBDMF39778173' ) RIDFLD('ISSC')
STATUS: COMMAND EXECUTION COMPLETE NAME=
EXEC CICS WRITE FILE( 'SBVSAM2 ' )
< SYSID() >
FROM( 'ISSC BALADBDMF39778173' )
< LENGTH( +00023 ) >
RIDFLD( 'ISSC' )
< KEYLENGTH() >
< RBA | RRN >
< MASSINSERT >
< NOSUSPEND >
RESPONSE: NORMAL EIBRESP=+0000000000 EIBRESP2=+0000000000
PF 1 HELP 2 HEX 3 END 4 EIB 5 VAR 6 USER 7 SBH 8 SFH 9 MSG 10 SB 11 SF
删除VSAM文件纪录:
CICS使用DELETE命令来删除VSAM文件的纪录。只有KSDS和RRDS结构的VSAM文件中的纪录能被删除，这与数据的存放格式有关。ESDS文件
的纪录按进入的顺序排放，只能在文件尾增加纪录，不能删除，而且更新时不能改变长度。如果该记录在请求删除前正在被更新，那么
参数RIDFLD可以不指定，默认为当前记录。如果使用GENERIC参数，必须给定KELENGTH参数，指出KEY长度，同时NUMREC指出要删除的记
录长度，这样就可以一次删除若干条记录。
DELETE FILE('SBVSAM2') RIDFLD('ISSC')
STATUS: ABOUT TO EXECUTE COMMAND NAME=
EXEC CICS DELETE FILE( 'SBVSAM2 ' )
< SYSID() >
< TOKEN() | RIDFLD( 'ISSC' ) < KEYLENGTH() < GENERIC < NUMREC() > > > >
< RBA | RRN >
< NOSUSPEND >
PF 1 HELP 2 HEX 3 END 4 EIB 5 VAR 6 USER 7 SBH 8 SFH 9 MSG 10 SB 11 SF
DELETE FILE('SBVSAM2') RIDFLD('ISSC')
STATUS: COMMAND EXECUTION COMPLETE NAME=
EXEC CICS DELETE FILE( 'SBVSAM2 ' )
< SYSID() >
< TOKEN() | RIDFLD( 'ISSC' ) < KEYLENGTH() < GENERIC < NUMREC() > > > >
< RBA | RRN >
< NOSUSPEND >
RESPONSE: NORMAL EIBRESP=+0000000000 EIBRESP2=+0000000000
PF 1 HELP 2 HEX 3 END 4 EIB 5 VAR 6 USER 7 SBH 8 SFH 9 MSG 10 SB 11 SF