gdbm with c programmin Books & Tutorial. Post: 302697385

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Top Forums Programming gdbm with c programmin Books & Tutorial. Post 302697385 by DGPickett on Thursday 6th of September 2012 04:52:33 PM

09-06-2012

Registered User

It is good to know relational databases, generally, and SQL, and simpler C/C++/JAVA APIs, before diving into the combination. The APIs are more orderly in C++/JAVA, while C APIs run on assumptions and man pages. Starting with a simple API to learn C/C++/JAVA is a good start, before going into complex APIs.

Generally, gdbm allows you to create container objects with hash based search. Ther are many different container types. They all act much like a RDBMS table with one index only. You can index data a second way by creating a second, indexing container to search using a different key. Data storage can be by pointer outside the containers, so two containers can point to the same row or tuple of data. However, you need reverse pointers in the data so a delete on one key can delete in the other container, too.

Besides hash, which is great for fast random lookup but requires some configuration for size, there is linear-hash, tree, unsorted, array, linked-list (one way or forward-backward) containers, each with different advantages. Trees are always sorted and tolerate all amounts of data well without configuration. Unsorted linked list is very fast to insert and slow to query, update, delete specific item. Hash has a patterened disorder when examining all items.

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LEARN ABOUT LINUX

prtfru

prtfru(1M)						  System Administration Commands						prtfru(1M)

NAME

       prtfru - print FRUID-specific information about the FRUs on a system or domain

SYNOPSIS

       /usr/sbin/prtfru  [-d] | [-clx] [container]

DESCRIPTION

       The  prtfru  utility is used to obtain FRUID data from the system or domain. Its output is that of a tree structure echoing the path in the
       FRU (Field-Replaceable Unit) tree to each container. When  a container is found, the data from that container is  printed  in  a  tree-like
       structure as well.

       prtfru  without	any arguments will print the FRU hierarchy and all of the FRUID container data. prtfru prints to stdout which may be redi-
       rected to a file.

OPTIONS

       The following options are supported:

       -c	Prints only the containers and their data. This option does not print the FRU tree hierarchy.

       -d	Prints a DTD for the current registry to stdout.

       -l	Prints only the FRU tree hierarchy. This option does not print the container data.

       -x	Prints in XML format with a system identifier (SYSTEM) of prtfrureg.dtd.

       Options -c and -l can be used together to obtain a list of the containers.

OPERANDS

       The folowing operand is supported:

       container       The name of a particular container in the FRU hierarchy, that is, either the name or path/name of a container as  displayed
		       in the -l option.

EXIT STATUS

       The following exit values are returned:

       0	All information was found and printed successfully.

       >0	An error has occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWfruid 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       fruadm(1M), attributes(5)

SunOS 5.10							    30 May 2002 							prtfru(1M)