HP 3000 Manuals HP 3000 Manuals
Summary of Commands to Change Data Items DBChange Plus has several commands for changing data items in the database. Some deal with several types of data item changes; others are specific to data item security. For example, the CHANGE ITEM command deals with changes to the attributes and security of a data item and the order that the data item appears in the data item list; while CHANGE ITEMSECURITY only deals with data item security. If you are making several types of changes to a data item, such as subitem count, data type, and length, then CHANGE ITEM is a more efficient command. However, if you are making only security changes to a data item, then CHANGE ITEMSECURITY is a better choice. This chapter covers only those commands that deal with several types of changes to a data item. For more information about how to use commands that deal specifically with security, refer to chapter 7, "Changing Database Security." Table 4-1 alphabetically lists all the commands that involve changes to data items and summarizes their functions.
NOTE * Before invoking any of the following commands, you must log on to the system as the database creator, run the DBCPLUS program, and specify the database that you want to restructure. Refer to chapter 1, "Introduction to DBChange Plus." * The commands are not actually applied until the DBAPLUS program is used. Refer to chapter 9, "Applying Changes to the Database Structure."
Table 4-1. Summary of Commands to Change Data Items ----------------------------------------------------------------------------------------------- | | | | | Command | Keyword | Description | | | | | ----------------------------------------------------------------------------------------------- | | | | | ADD | ITEM | Adds a data item to the database. | | | | | ----------------------------------------------------------------------------------------------- | | | | | CHANGE | ATTRIBUTE | Changes the subitem count, type, and/or length | | | | of a data item. | | | | | | | ITEM | Changes the subitem count, type, length, | | | | security, and/or order of a data item. | | | | | | | ITEMSECURITY | Changes user class access to a data item | | | | (security command only). | | | | | ----------------------------------------------------------------------------------------------- | | | | | DELETE | ITEM | Deletes a data item and its fields and | | | | associated paths from the database. | | | | | | | ITEMSECURITY | Deletes all security specifications from a data | | | | item (security command only). | | | | | ----------------------------------------------------------------------------------------------- | | | | | RECOVER | ITEM | Cancels a data item deletion. | | | | | ----------------------------------------------------------------------------------------------- | | | | | RENAME | ITEM | Renames a data item. | | | | | ----------------------------------------------------------------------------------------------- | | | | | REORDER | ITEM | Reorders the sequence in which the data item | | | | resides in the database. | | | | | -----------------------------------------------------------------------------------------------