📅 最后修改于: 2020-11-22 16:36:08 🧑 作者: Mango
CICS允许我们以多种方式访问文件数据。在联机系统中，大多数文件访问是随机的，因为要处理的交易没有进行批量处理并按任何顺序排序。因此，CICS支持通常的直接访问方法-VSAM和DAM(直接访问方法)。它还允许我们使用数据库管理器访问数据。
以下是用于随机处理的命令-
| Sr.No | Commands & Description |
|---|---|
| 1 | READ
READ command reads data from a file using primary key. |
| 2 | WRITE
Write command is used to add new records to a file. |
| 3 | REWRITE
REWRITE command is used to modify a record that is already present in a file. |
| 4 | DELETE
DELETE command is used to delete a record that is present in a file. |
以下是用于顺序处理的命令-
| Sr.No | Commands & Description |
|---|---|
| 1 | STARTBR
STARTBR is known as start browse. |
| 2 | READNEXT / READPREV
When we issue a STARTBR command, it does not make the records available. |
| 3 | RESETBR
The RESETBR command allows us to reset our starting point in the middle of a browse. |
| 4 | ENDBR
When we have finished reading a file sequentially, we terminate the browse using the ENDBR command. |