Adding an existing value?
Hi guys,.
I am new to Berkeley DB. I was wondering if there is a way to add to an existing value in the comic book. In my application, the value is in the form of link-list (which is converted to DataEntry). On each update, I would like to add to it and then write it to the disk. I am currently using Berkeley DB in synchronous mode. So, whenever I do an update, the integer value is read into memory and then update is made and this great updated value is written to the disk. It takes a lot of time. Is there a way by which just change can be added to the list? There is the flag Db.DB_APPEND in com.sleepycat.db. * (Berkeley DB standard), but is there something similar in Berkeley DB Java Edition?
BDB - I is based on what we call architecture "structured file newspaper." This does not allow updates on data; each update of a record creates a new version of record, which is added at the end of a log file (a "cleaner" internal module is responsible for disposing of older versions to recover disk space). There are advantages and disadvantages of this architecture, but it is what it is.
For your case, the best approach may be to store list items in separate records in a DB "duplicates". Records in a DB duplicates have, conceptually, 2 keys, a primary and a secondary key, and they are sorted first by their primary key, and then by their secondary key. In addition, the entire records are stored in the nodes of a BTree. Thus, consecutive records are stored physically next to each other as long as they fit into the same BTree node. This provides a degree of the locality. In your case, the primary key is the id of the list, and assuming that the lists are only added, the secondary key could be the position of the record in the list. Note that secondary keys are not explicitly exposed to the API. You implicitly declare them by providing a "comparator" class to compare parts of the value of the (primary) key/value pairs.
For other databases, many of the more traditional RDBMS provide support "-" LOB (large object), which, I believe, can do what you want (of course, internally, the LOB can also be broken up into several segments). I don't know if the most recent NoSQL databases offer such capabilities.
Best,
Markos.
Tags: Database
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@allocate to be distributed by linearly adding to existing values?
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(Translation :) expected type [NUMBER] found [EMPTY]
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DIFFICULTY (' 21 ',' e080201 ', 'HSP_InputValue', 'FY11","Local","Run business","Run garden en Programa")
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So the problem is, apparently, that I can not make a distribution of value added to the existing.
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Agnete
Published by: Agnete on October 11, 2012 14:12I do not use the allocate function very often and have never encountered this. Failure to allow you to add the benefit to herself, I could think of two ways around it. You have a member that is used only for the results of the assignment, and then add that to the Member.
DIFFICULTY (' 21 ',' e080201 ', 'HSP_InputValue', 'FY11","Local","Run business","Run garden en Programa")
"MontoTMP"=@ALLOCATE (26000 * 1000, Jan: Feb, Monto, propagation, SKIPNONE, roundAmt, -3, errorsToHigh);
"Monto"="MontoTMP" + "Monto"
ENDFIX;I don't use very often variables, but this could be a good use of one. If it will work for you, you wouldn't have to have a useless member.
var varAllocation;
DIFFICULTY (' 21 ',' e080201 ', 'HSP_InputValue', 'FY11","Local","Run business","Run garden en Programa")
varAllocation =@ALLOCATE (26000 * 1000, Jan: Feb, Monto, propagation, SKIPNONE, roundAmt, -3, errorsToHigh);
"Monto" = varAllocation + "Monto"
ENDFIX;Good luck with a solution!
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Kyle Goodfriend
http://www.in2hyperion.com
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user756931 wrote:
Please update your forum profile with a real handle instead of 'user756931 '.
I have an apex page that I want to use the same page for different tabs except that the query condition changes.
Lets say, I have 3 tabs - Finance, sales, Marketing.
I have a page which requests for the list of employees in a specific area (finance, sales, Marketing).
I will eventually have 3 different types of queries, as below. The only change between them is the area.
SELECT name, salary from employee where area = 'funding '.
SELECT name, salary from employee where area = "sales";
SELECT name, salary from employees where area = 'Marketing ';
Is it possible to make my query in the following way to ensure that I get the TAB_ID of the value of the tab that I store.
SELECT name, salary from employees where area is TAB_ID;
What is the way to store one or more values of the TAB and use them in queries for a page.
Assuming that by "tabs" you mean standard tabs and that the page contains a report of the region, so there is no way to do out of the box. Try to apply it using the standard tabs would hit two major obstacles:
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