SIMPLE DATABASE QUESTION

How do we know which type of drivers we are using
suppose we r using mysql then which type of driver we are using type1,2,3,4

How do we know which type of drivers we are using
suppose we r using mysql then which type of driver we
are using type1,2,3,4Just put the mysql driver JAR in your classpath. MySQLConnector/J is a type-4 driver.

Similar Messages

SIMPLE Database Design Problem !

Mapping is a big problem for many complex applications.
So what happens if we put all the tables into one table called ENTITY?
I have more than 300 attributeTypes.And there will be lots of null values in the records of that single table as every entityType uses the same table.
Other than wasting space if I put a clustered index on my entityType coloumn in that table.What kind of performance penalties to I get?
Definition of the table
ENTITY
EntityID > uniqueidentifier
EntityType > Tells the entityTypeName
Name >
LastName >
CompanyName > 300 attributeTypes
OppurtunityPeriod >
PS:There is also another table called RELATION that points the relations between entities.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
check the coloumn with WHERE _entityType='PERSON'
as there is is clustered index on entityType...there
is NO performance decrease.
there is also a clustered index on RELATION table on
relationType
when we say WHERE _entityType ='PERSON' or
WHERE relationType='CONTACTMECHANISM'.
it scans the clustered index first.it acts like a
table as it is physically ordered.I was thinking in terms of using several conditions in the same select, such as
WHERE _entityType ='PERSON'
AND LastName LIKE 'A%' In your case you have to use at least two indices, and since your clustered index comes first ...
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Have you ever thought of using constraints in your
modell? How would you realize those?
...in fact we did.We have arranged the generic object
model in an object database.The knowledge information
is held in the object database.So your relational database is used only as a "simple" storage, everything has go through your object database.
But the data schema is held in the RDBMS with code
generation that creates a schema to hold data.If you think that this approach makes sense, why not.
But in able to have a efficent mapping and a good
performance we have thought about building only one
table.The problem is we know we are losing some space
but the thing is harddisk is much cheaper than RAM
and CPU.So our trade off concerated on the storage
cost.But I still wonder if there is a point that I
have missed in terms performance?Just test your approach by using sufficiently data - only you know how many records you have to store in your modell.
PS: it is not wise effective using generic object
models also in object databases as CPU cost is a lot
when u are holding the data.I don't know if I'd have taken your approach - using two database systems to hold data and business logic.
PS2: RDBMS is a value based system where object
databases are identity based.we are trying to be in
the gray area of both worlds.Like I wrote: if your approach works and scales to the required size, why not? I would assume that you did a load test with your approach.
What I would question though is that your discussing a "SIMPLE Database Design" problem. I don't see anything simple in your approach when it comes to implementation.
C.

Simple database app.

I know there have been loads of questions about simple database apps, but I wanted to ask if anyone could recommend something specific:
Every month I receive an Excel spreadsheet of data (a membership list) for my organisation. It is basically a list of members' contact details and a few other bits of data. Up until now I have been using FileMaker 8.5 but the problems with Leopard are the last straw; it seems a vastly overpriced solution for what I actually need.
All I need is to be able to create reports of members, search the database and ocassionally print some address labels for mailouts. Obviously FileMaker is capable of doing this, but it's too expensive and I use only the basic features. It seems crazy for a small office like mine to have to pay over the odds for this; I know FileMaker is capable of much more and hence the cost, but I was looking for an alternative.
Is there anything that would be suited to my needs?
Thanks in advance!

Hi Harry !
if your data simply contacts and a few bit more, what about AddressBook.app ? I know, that it is not much confortable to import/export but for Contacts is good (&Inclusive).
I don't know when the OpenOffice developers will make a bigger update for Leo, perhaps the current version will work too. Try it: http://porting.openoffice.org/mac/download/index.html (135MB)
Ciao
Massimo

Help with Designing a Simple Database

I am currently working on a designing problem I would appreciate if someone could review my solution.
The Problem:
I need to create a simple database that contains the following entries�
First Name //mandatory
Last Name //mandatory
Date of Birth //mandatory
Hobbies //there could be anywhere from 0 to infinite amount of hobbies
Type of actions that I need to perform on the database�
Add, delete, and modify and entry
Below are a two design solutions I came up with�
For both solutions I am going to create two text files. One of the text files called profiles.txt will contain the following fields on each line�
Id, First Name, Last Name, Date of Birth
//the Id field in this text file will be the primary key so you will not see the Id duplicated
The other text file called hobbies.txt will contain the following fields on each line�
Id, hobby
//the Id field can be duplicated in this text file so a person can be linked to zero or several hobbies
Now what differs between my solutions is how I am going to read this data into my program�
Solution 1) When you start the program it will read the profiles.txt into a linked list. After that is finished the program will then load the hobbies into several linked list that the profiles linked list will point to. So basically each person will have a linked list of hobbies associated with him or her.
Problem I see with this solution is that if there were 200 million people contained in the profiles.txt would my program crash since the computer would not have enough memory to load all of those names?
Solution 2) Instead of loading the data at the start of the program the data will stay in the text files. So when someone does a search it will open the text file and search for the entry.
Problem with this solution is it would be hard to delete and modify names (would I have to rewrite the text file every time I do a change?). Would a good fix to this problem be creating a separate text file to keep track of any changes or deletions I do and once in a while do a database maintenance?
So a review of my questions is�
1)     Would my program crash if I had 200 million entries if I use my solution 1?
2)     Is my solution 2 possible without being incredibly slow or complicated?
3)     Is there another way of doing this I have not thought of?

I think having one option will do. Now the problem with this text file thing is that, we'll hve to read every information into memory if we are running a test driver for the program and then work on the information in memory.
After the program closes, whatever changes we made to this data in memory shd be written to file so we need to find a way of writing the data from memory to overwrite the file. I hope you kinda get what i'm talking abt.
the database will consist of information like this
String firstName
String lastName
String DOB
ArrayList / Vector Hobbies
Now, we kinda want to declare a class with with all these information as data fields ok.
so let's say
public class Try{
String firstName
String lastName
String DOB
ArrayList / Vector Hobbies
and then create an instance of this class in the driver
which will be an ArrayList of this class or something so each index of this class ArrayList will hve it's unique data information from the file we read in but again, this is kinda working in memory right.
After doing all we have to do, we want to write back to file all the changes we made to the data in memory. That's where we are kinda stuck right now.
A member of the group was suggesting we call whatever functions to work on the txt file which will mean we'll hve to re-write each time we call a function to operate on it and all that stuff. This is a slow process.
will be glad if anybody out there will have a better way to implement this. Thanks a lot.

Looking for a simple database app.

I have an Excel sheet that i use to store simple database data. Like a flat file database with only 4 columns, no relations, no calculations, just data storage.
I don't want to download and install over a 100Mb of OpenOffice or NeoOffice just to be able to see my Excel sheet so i was thinking at converting it to a simple cardfiler-like database.
Guess what? There are no simple databases for the Mac! There is OpenOffice and NeoOffice and there is FileMaker. But no simple, small, configurable card-filer. I checked VersionTracker, IUseThis, but i cannot find anything.
That makes me think that it already needs to be available on the standard installed apps (please say that i'm right) and i just don't see it.
Any suggestions? Any help? Am i really missing the point here?
Thanks all!
Ton.

Haven't looked at Wallet. Looked at iData, but that is payware now. I'm trying now woth OmniOutliner which seems to look ok.
Ton.

Simple/silly question: how do I set/change default font/color for outgoing mail messages?

Simple/silly question: how do I set/change default font/color for outgoing mail messages?

Just a suggestion..........
Download Thunderbird. Easier to use when it comes to what you want to do w/your emails.

Very simple database require

Hi
I'm looking for a very simple database solution. I have some very large .csv files that I need to query against before importing to Excel. Filemaker, etc. is over the top for what I need. Any ideas?
Thanks.
PowerPC G5 Mac OS X (10.4.6)

Welcome to Apple Discussions!
You could use a script that converts CSV to Appleworks:
http://www.tandb.com.au/appleworks/import/
And then export from Appleworks to Excel.
I know the PowerMac G5 doesn't come with Appleworks, but it is a quarter of the price of Filemaker Pro.
Maybe the authors of the script could help you.

A very simple database system with JSON

If we need to store some data in a database, but without the need of advanced SQL features, can we use this scheme (written here in Javascript / node.js) :
// the DB will be in RAM !
var myDb = {};
// read DB from disk if file exists
try { myDb = JSON.parse(fs.readFileSync(DBFILENAME)); } catch(e) { }
// serialize to disk every minute or when process terminates
function serialize() { fs.writeFile('./myDb.json', JSON.stringify(myDb)); }
setInterval(serialize, 60 * 1000);
process.on('SIGTERM', serialize); process.on('SIGINT', serialize);
myDb['record1'] = 'foo';
myDb['record2'] = 'bar';
See
the longer version here as a gist (8 lines of code).
1) Does this DB practice have a name? Is it really so bad? Is it possible to use such a
10-lines-of-code DB system, even in production of websites that have a < 1 GB database ?
2) Scalability: until which size would this system work without performance problems?
i.e. would it work until 2GB of data on a a normal Linux server with 4GB RAM? Or would there be real performance problems?
Note: a minute seems enough to write a 2GB data to disk... Of course I admit it is 100% non-optimized, we could add
diff feature between n-1th and nth writing to disk...
3) Search: can I use ready-to-use tools to do some search in such a "simple" database? Lucene, ElasticSearch, Sphinx, etc. something else?

Nothing is wrong with this for development. If it has a name, I suppose it would be a mock database. It is not uncommon to create a mock database that can emulate very basic functionality. You have the added advantage that you start from a scratch
database each and everytime, thus you know that your program would work also for a potential empty nosql database for the same reason.
However this is not a reasonable permanent solution by any means.
Most programmers, due to the small overhead, will simply go ahead and make it work with a nosql database. It may take slightly longer, you are also programming directly to work in production and not being forced to adapt your program and test it beforehand.
Scalability is a non-issue because you're always working in development. If you crash your own computer, it is not that big of a deal. The limit of such a database would be only that of your RAM (or the RAM of the computer running the server), however I
think you'd find that you'll find that the program gets very slow before you even reach the point when your program will crash.
Perhaps you could adapt some searching mechanism for the mock database, but if you're going to go through the trouble, just go ahead and use a proper nosql database. If you literally lose more than 1 hour working on this mock database, then you've wasted
time.

4 Simple Flash Questions that Are Stumping Me!

What is the Frame Rate for Web Animations
Q1. I am making an animation which will be played on the web. What is the default frame rate (fps) of Flash CS5? And what is the frame rate of for web?
Q2. My animation needs to be 30 seconds long. So at 15 fps that would mean I need to use 600 frames in Flash?
How Do I Mask everything so all I see is the Content on the Stage?
I have a wide image that extends past my movies stage size so when I preview my movie the image is visible. How do I mask out anything that extends past my movies window size? I believe I can create a layer named "mask" and place it above all other layers, but I forget how to make the mask. Any help is appreciated.
How to Fade a Graphic
I have a graphic element (some type) and I want it to fade from 0% to 100%. In older versions of Flash I could just select the symbol and then set it's alpha value to 0%, move a few keyframes and then set the alpha to 100%. Voila! but now it doesn't seem to work that way. How can I do this in CS5?

Ned, it says 24 fps which means there is 24 frames per second so each 24 frames is 1 second.
Date: Fri, 4 Nov 2011 05:35:16 -0600
From: [email protected]
To: [email protected]
Subject: 4 Simple Flash Questions that Are Stumping Me!
    Re: 4 Simple Flash Questions that Are Stumping Me!
    created by Ned Murphy in Flash Pro - General - View the full discussion
1 You can create your character as a movieclip and copy/paste that movieclip from one file to another. 2. One way to create a movieclip is to copy all the frame of the animation's timeline (select them all, right click the selection, choose Copy Frames), then create a new movieclip symbol (Insert -> New Symbol...etc) right click on its only keyframe and chhose Paste Frames. THat will put all the layers and frames you copied into the movieclip The only way to come close to being certain about the timing of you animation is to use code to keep track of the time, something like getTimer().. The frame rate that a file plays at is not a reliable means of dictating the time it takes due to a variety of factors which include the amount of content you are trying to process and performance limits of the user's machine.
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Simple performance question

Simple performance question. the simplest way possible, assume
I have a int[][][][][] matrix, and a boolean add. The array is several dimensions long.
When add is true, I must add a constant value to each element in the array.
When add is false, I must subtract a constant value to each element in the array.
Assume this is very hot code, i.e. it is called very often. How expensive is the condition checking? I present the two scenarios.
private void process(){
for (int i=0;i<dimension1;i++)
for (int ii=0;ii<dimension1;ii++)
for (int iii=0;iii<dimension1;iii++)
    for (int iiii=0;iiii<dimension1;iiii++)
         if (add)
         matrix[i][ii][iii][...] += constant;
         else
         matrix[i][ii][iii][...] -= constant;
private void process(){
if (add)
for (int i=0;i<dimension1;i++)
for (int ii=0;ii<dimension1;ii++)
for (int iii=0;iii<dimension1;iii++)
    for (int iiii=0;iiii<dimension1;iiii++)
         matrix[i][ii][iii][...] += constant;
else
for (int i=0;i<dimension1;i++)
for (int ii=0;ii<dimension1;ii++)
for (int iii=0;iii<dimension1;iii++)
    for (int iiii=0;iiii<dimension1;iiii++)
       matrix[i][ii][iii][...] -= constant;
}Is the second scenario worth a significant performance boost? Without understanding how the compilers generates executable code, it seems that in the first case, n^d conditions are checked, whereas in the second, only 1. It is however, less elegant, but I am willing to do it for a significant improvement.

erjoalgo wrote:
I guess my real question is, will the compiler optimize the condition check out when it realizes the boolean value will not change through these iterations, and if it does not, is it worth doing that micro optimization?Almost certainly not; the main reason being that
matrix[i][ii][iii][...] +/-= constantis liable to take many times longer than the condition check, and you can't avoid it. That said, Mel's suggestion is probably the best.
but I will follow amickr advice and not worry about it.Good idea. Saves you getting flamed with all the quotes about premature optimization.
Winston

Simple database server

For school i need to develop an application.
Can anyone help me with a simple database server? I want to read data from my database.
Database: a simple employers table
I want to request for example all employers firstname.
How can i build the server?
How can i make the connection with the database?
Are there tutorials or examples?
Please help.
Thanks in advance.

I'd say Hypersonic SQL (HSQLDB) is your simplest bet; easy to setup and no software installation required because it is a pure java database. All you need to know is on their website:
http://hsqldb.org/

A few simple Logic questions...please help.

I have a few probably simple Logic questions, that are nonetheless frustrating me, wondering if someone could help me out.
1. I run Logic 8, all of the sounds that came with logic seem to work except organ sounds. I can't trigger any organ sounds (MIDI) on Logic, they won't play. I have a Yamaha Motif as my midi controller.
Any idea why?
2. I've starting running into a situation where I will record a MIDI track, the notes are recorded but they won't playback. The only track effected is the one that was just recorded. All other midi tracks playback.
I have to cut the track, usually go out of Logic and back in, re record for it to playback properly. Any idea why this may be happening?
3. How important is it to update to Logic 9. Are there any disadvantages down the road if I don't upgrade. If I purchase the $200 upgrade, do I get a package of discs and material, or it just a web download.
Any help is appreciated!
Colin

seeren wrote:
Data Stream Studio wrote:
3) You get a full set of disks and manuals.
They're including manuals now?
I think his referring to the booklets ...on how to install etc
It would be great to see printed manuals though ...I love books especially Logic/Audio related !!
A

Basic Clone database question

hi all,
I have very basic clone database question
If i create database A and clone database B using A...
I want to know that any operation done on A will be automatically done on Cloned database B.
Hope u understand
Thanks,
Neerav

hi all,Hi Neerav
I have very basic clone database question
If i create database A and clone database B using A...
I want to know that any operation done on A will be automatically done on Cloned database B.Oops....Now you're asking about rocket science. Sorry, I don't know.
I know about some basics:
Streams or Replication--> Which can give you data on B in read-write mode.
DR--> For safeguarding your database and B will work as DR solution.
Hope u understandNo, please make us understand.
Regards,
S.K.

Simple Quick Question

wrong section, post was moved.
Message was edited by:
Rob17

you titled "simple quick question"...
.. complicated to answer..
a) the TermsOfUse of the iTS don't allow any processing of purchased files, these are "copy protected"..
b) iM has a voice-over function..
c) iM is a video-edit app.. easy to use... just learn to handle it...
d) iM allows to "extract" audio (=muting the original audio, adding your own..)
e) to learn iM, spend some time here: http://www.apple.com/ilife/tutorials/imovie/index.html
f) use pencil and paper first! WRITE and scribble, what shall happen when in your movie/parody... make a script, draw a storyboard .. THEN launch iM.. in other words: think first, then edit.. iM is just a tool, it does not "create"... Picasso needed a papertowel and half a stencil to create art....
g) to get comfortable with iM, start with your own, small, short (3min!) project... import some stills, edit them, add a funny voice-over, add sounds, add music... good? make a bigger one...
h) .. in our Lecture II, we teach you how to import shows from TV, youtube, wherever..
standard disclaimer:
be nice to ©opyrights ...

Simple query question

hi all,
I have a XMLType table with one column - I have presently one row, in my column xmlsitedata I have stored one large xml file.The schema definition is given below:
<?xml version="1.0" encoding="UTF-8" ?>
- <xs:schema elementFormDefault="qualified" attributeFormDefault="unqualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
- <xs:element name="siteList">
- <xs:complexType>
- <xs:sequence>
<xs:element name="site" type="siteType" minOccurs="0" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:element>
- <xs:complexType name="siteType">
- <xs:sequence>
<xs:element name="nameEn" type="xs:string" />
<xs:element name="nameFr" type="xs:string" />
</xs:sequence>
<xs:attribute name="code" type="xs:string" />
</xs:complexType>
</xs:schema>
I have executed the query below:
select x.XMLSITEDATA.extract('/siteList/site/nameEn/text()').getCLOBVal() "stName" from wsitelist x;
and I get all english names of some 200 locations, however, there is 1 row selected and all names show up on one row. How do I split them into 200 or whatever rows?
Thanks,
Kowalsky

Have a look at the answer provided in the following thread.
very simple XML question
This may solve your problem.
use xmlsequence.
Alvinder

SIMPLE DATABASE QUESTION

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