Retrieves objects, one object at a time, from an ODM object class.
Object Data Manager Library (libodm.a)
struct ClassName *odm_get_obj (ClassSymbol, Criteria, ReturnData, FIRST_NEXT)
struct ClassName *odm_get_first (ClassSymbol, Criteria, ReturnData)
struct ClassName *odm_get_next (ClassSymbol, ReturnData)
CLASS_SYMBOL ClassSymbol; char *Criteria; struct ClassName *ReturnData; int FIRST_NEXT;
The odm_get_obj, odm_get_first, and odm_get_next subroutines retrieve objects from ODM object classes and return the objects into C language structures defined by the .h file produced by the odmcreate command.
The odm_get_obj, odm_get_first, and odm_get_next subroutines open and close the specified object class if the object class was not previously opened. If the object class was previously opened, the subroutines leave the object class open upon return.
|ClassSymbol||Specifies a class symbol identifier returned from an odm_open_class subroutine. If the odm_open_class subroutine has not been called, then this identifier is the ClassName_CLASS structure that was created by the odmcreate command.|
|Criteria||Specifies the string that contains the qualifying criteria for retrieval of the objects.|
|ReturnData|| Specifies the pointer to the data structure in the .h file created by the odmcreate command. The name of the structure in the .h file is ClassName. If the ReturnData parameter is null (ReturnDat
), space is allocated for the parameter and the calling application is responsible for freeing this space at a later time.
If variable length character strings (vchar) are returned, they are referenced by pointers in the ReturnData structure. Calling applications must free each vchar between each call to the odm_get subroutines; otherwise storage will be lost.
|FIRST_NEXT||Specifies whether to get the first object that matches the criteria or the next object. Valid values are:|
Upon successful completion, a pointer to the retrieved object is returned. If no match is found, null is returned. If an odm_get_obj, odm_get_first, or odm_get_next subroutine is unsuccessful, a value of -1 is returned and the odmerrno variable is set to an error code.
Failure of the odm_get_obj, odm_get_first or odm_get_next subroutine sets the odmerrno variable to one of the following error codes:
|The specified search criteria is incorrectly formed. Make sure the criteria contains only valid descriptor names and the search values are correct.|
|The specified object class does not exist. Check path name and permissions.|
|The object class cannot be opened because of the file permissions.|
|An internal consistency problem occurred. Make sure the object class is valid or contact the person responsible for the system.|
|Either the specified collection is not a valid object class collection or the collection does not contain consistent data.|
|The specified path does not exist on the file system. Make sure the path is accessible.|
|The class symbol does not identify a valid object class.|
|Cannot allocate sufficient storage. Try again later or contact the person responsible for the system.|
|Cannot open the object class. Check path name and permissions.|
|Too many object classes have been accessed. An application can only access less than 1024 object classes.|
These subroutines are part of Base Operating System (BOS) Runtime.
The odm_get_list subroutine, odm_open_class subroutine, odm_rm_by_id subroutine, odm_rm_obj subroutine.
The odmcreate command, odmget command.
List of ODM Commands and Subroutines.
For more information about qualifying criteria, see "Understanding ODM Object Searches" in AIX Version 4.3 General Programming Concepts: Writing and Debugging Programs.
See ODM Example Code and Output in AIX Version 4.3 General Programming Concepts: Writing and Debugging Programs for an example of a .h file.
Object Data Manager (ODM) Overview for Programmers in AIX Version 4.3 General Programming Concepts: Writing and Debugging Programs.