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  • What are appropriate ways to represent relationships between people in a database table?

    - by Emilio
    I've got a table of people - an ID primary key and a name. In my application, people can have 0 or more real-world relationships with other people, so Jack might "work for" Jane and Tom might "replace" Tony and Bob might "be an employee of" Rob and Bob might also "be married to" Mary. What's the best way to represent this in the database? A many to many intersect table? A series of self joins? A relationship table with one row per relationship pair and type, where I insert records for the relationship in both directions?

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  • Convert a MSSQL database to MYSQL database

    - by soldieraman
    Alright so I want to convert an already exist MSSQL database (2005) to a MYSQL database. There is nothing extraordinary to be done The only things I need to achieve is Recreate the tables Transfer data Relationships would be nice but not necessary No views, no sprocs, no functions. Any easy way to do this. Also do you know of any DST (Database Synchronization Tool) which would let me do MSSQL to MYSQL MYSQL to MYSQL MSSQL to MSSQL (I know there is SQL Delta for this)

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  • Command line import of database using latin1 encoding

    - by chrisjlee
    I'm using a particular cloud hosting solution (one which i won't name) and they don't provide ssh access so i'm at a whim on how the database is dumped. I downloaded the dump which is packed into a tar.gz file. I discover that this file utilizes latin1 encoding. Which i don't get to specify the encoding for the host i'm using because i don't have SSH access or DB access. I try to import it via command line for my local development environment (mysql -uroot foodb < file.db) like i usually do with other databases but am having problems. Is it possible to import a database via command line by specifying which encoding (preferably latin1) before importing it? Or do i have to convert it to UTF8?

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  • how does object programming work?

    - by venom
    Hello, I am not sure about some things in oop. If I have Class1, which has some private field, for example private Field field1, and make getField1(){return field1;} then I have some class with constructor public Class2(Field field){someMethod(field);} And then I call constructor of Class2 in Class3 like: Class2 cl = new Class2(instanceOfClass1.getField1()); And now the question: Am I working with field1 of instanceOfClass1 in "someMethod(field)"?

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  • Optimising Database Calls

    - by Dwaine Bailey
    I have a database that is filled with information for films, which is (in turn) read in to the database from an XML file on a webserver. What happens is the following: Gather/Parse XML and store film info as objects Begin Statement For every film object we found: Check to see if record for film exists in database If no film record, write data for film Commit Statement Currently I just test for the existence of a film using (the very basic): SELECT film_title FROM film WHERE film_id = ? If that returns a row, then the film exists, if not then I need to add it... The only problem is, is that there are many many hundreds of records in the database (lots of films!) and because it has to check for the existence of a film in the database before it can write it, the whole process ends up taking quite a while (about 27 seconds for 210 films) Is there a more efficient method of doing this, or just any suggestions in general? Programming Language is Objective-C, database is in sqlite3 Thanks, Dwaine

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  • Object reference error even when object is not null

    - by Shrewd Demon
    hi, i have an application wherein i have incorporate a "Remember Me" feature for the login screen. I do this by creating a cookie when the user logs in for the first time, so next time when the user visits the site i get the cookie and load the user information. i have written the code for loading user information in a common class in the App_Code folder...and all my pages inherit from this class. code for loading the user info is as follows: public static void LoadUserDetails(string emailId) { UsersEnt currentUser = UsersBL.LoadUserInfo(emailId); if (currentUser != null) HttpContext.Current.Session["CurrentUser"] = currentUser; } Now the problem is i get an "Object reference" error when i try to store the currentUser object in the session variable (even though the currentUser object is not null). However the password property in the currentUser object is null. Am i getting the error because of this...or is there some other reason?? thank you

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  • property not updating in object when page is posted

    - by Jared
    Hi I have set a property in a constructor like so function __construct() { $this->count = count(@$_SESSION['filearray']); //count how many files in array } and using it in condition statements if($this->count > 10) //then do something but it appears the count isn't being updated when I use another method of injecting values into this 'filearray' until I refresh the page. am I doing something wrong? I thought that my constructor would detect a change had been made in the session and whenever I call $this-count I would get the current count value but it seems to be 1 step behind until I refresh the page. If this is all vague I can include my form page that has all the method calls, but this is the jist of my question, why is my property not updating and how do I fix it :) TIA

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  • search through related field for specific related object

    - by dotty
    Hay, I'm working on a simple voting system, where users can vote on a poll. My model looks like this class Poll(models.Model): question = models.CharField() votes = models.IntegerField() usersVoted = models.ManyToManyField(User) Now, i want to scan through the usersVoted field to see if a User object is in there. This User object will then be matched against a logged in User (User obj saved in a session). If the User has voted i want to be able to set a 'has_voted' field. I then want to use this field in my view. I will be using the Property() thingy inside the model to work this 'has_voted' value out. Like so def _can_vote(self): return False can_vote = property(_can_vote) Obviously it'll return a Bool. Any ideas how to search through a related field to find a specific Object?

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  • Postgres: clear entire database before re-creating / re-populating from bash script

    - by Hoff
    hi folks, I'm writing a shell script (will become a cronjob) that will: 1: dump my production database 2: import the dump into my development database Between step 1 and 2, I need to clear the development database (drop all tables?). How is this best accomplished from a shell script? So far, it looks like this: #!/bin/bash time=`date '+%Y'-'%m'-'%d'` # 1. export(dump) the current production database pg_dump -U production_db_name > /backup/dir/backup-${time}.sql # missing step: drop all tables from development database so it can be re-populated # 2. load the backup into the development database psql -U development_db_name < backup/dir/backup-${time}.sql Many thanks in advance! Martin

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  • Create an object in C# from an F# object with optional arguments

    - by Mark Pearl
    I have a object in F# as follows... type Person(?name : string) = let name = defaultArg name "" member x.Name = name I want to be able to create an instance of this object in a C# project. I have added as a reference the correct libraries to the project and can see the object via intellisense however I am not sure on the correct syntaxt to create an instance of the object. Currently I have the following in my C# project - which the compiler doesn't like... var myObj1 = new Person("mark");

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  • Cannot start Oracle XE 11gR2 Net Listener and Database on Ubuntu 13.04

    - by hydrology
    I have been following the setup step on this article for installing Oracle XE 11g R2 on Ubuntu 13.04. The environment variables PATH, ORACLE_HOME, ORACLE_SID, NLS_LANG ORACLE_BASE have all been set up correctly. simongao:~ 06:16:38$ echo $PATH /usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/simongao/adt-bundle-linux-x86_64-20130219/sdk/platform-tools:/u01/app/oracle/product/11.2.0/xe/bin simongao:~ 06:18:36$ echo $ORACLE_HOME /u01/app/oracle/product/11.2.0/xe simongao:~ 06:23:29$ echo $ORACLE_SID XE simongao:~ 06:23:35$ echo $ORACLE_BASE /u01/app/oracle simongao:~ 06:23:37$ sudo echo $LD_LIBRARY_PATH /u01/app/oracle/product/11.2.0/xe/lib simongao:~ 06:23:48$ echo $NLS_LANG /u01/app/oracle/product/11.2.0/xe/bin/nls_lang.sh However, when I try to startup the service, I receive the following error information. simongao:~ 06:18:40$ sudo service oracle-xe start Starting Oracle Net Listener. Starting Oracle Database 11g Express Edition instance. Failed to start Oracle Net Listener using /u01/app/oracle/product/11.2.0/xe/bin/tnslsnr and Oracle Express Database using /u01/app/oracle/product/11.2.0/xe/bin/sqlplus.

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  • How to rename database without first stopping SQL instance to flush connections

    - by John Galt
    Is there a way to force a database into single user mode so a script can be run to rename databases? I find I have to Restart the instance of SQL (to force off any connections from a web app, etc.) and then I can run this script: USE master go sp_dboption MDS, "single user", true go sp_dboption StagingMDS, "single user", true go sp_renamedb MDS, LastMonthMDS go sp_renamedb StagingMDS, MDS go sp_dboption LastMonthMDS, "single user", false go sp_dboption MDS, "single user", false go After this script runs, I can restart IIS for my web app and it can connect to the new production database. All the above works well and we've been doing this for years but now we've upgraded to SQL 2008 and the SQL2008 instance also hosts other databases that support other web apps. So, rather than using a Restart of the whole SQL instance to enable subsequent single-user mode on 2 databases, is there a less intrusive way of accomplishing this? Thanks.

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  • Timeout Error in SQL Server Database Mail Feature

    - by RedLEON
    I configured database mail profile as gmail smtp server, SSL and port 465. I didn't restart server. And this is first time to use Database Mail feature on that server. When I send a testing mail it give me this error message: The mail could not be sent to the recipients because of the mail server failure. (The operation has timed out) I tried this mail configuration with Thunderbird and I could send messages througt this SMTP. Why is SQL Server giving this eror message? I searched here but didn't find any solution.

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  • Postgres pg_dump dumps database in a different order every time

    - by behrk2
    Hello, I am writing a PHP script (which also uses linux bash commands) which will run through test cases by doing the following: I am using a PostgreSQL database (8.4.2)... 1.) Create a DB 2.) Modify the DB 3.) Store a database dump of the DB (pg_dump) 4.) Do regression testing by doing steps 1.) and 2.), and then take another database dump and compare it (diff) with the original database dump from step number 3.) However, I am finding that pg_dump will not always dump the database in the same way. It will dump things in a different order every time. Therefore, when I do a diff on the two database dumps, the comparison will result in the two files being different, when they are actually the same, just in a different order. Is there a different way I can go about doing the pg_dump? Thanks!

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  • What are performance limits of a database?

    - by Tommy
    What are some rough performance limits (read/s, write/s) for a single database server (no master-slave architecture), assuming storage on disk? How many read/s, write/s, depending on the kind of disk? (SSD vs non-SSD) , assuming simple operations (select one row by primary key, update one row, correctly indexed). I assume this limit is dependent on disk seek/write. EDIT: My question is more about getting rough metrics of the number of operations a database supports: to be able to know for example, if a new feature triggering 300 inserts/s can be supported without scaling out with additional servers.

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  • Connect android to database

    - by danny
    I am doing a school project where we need to create an android application which needs to connect to a database. the application needs to gain and store information for people's profiles on the database. But unfortunatly we are a little bit stuck at this point because there are numerous ways to link the application such as http request through apache or through the SOAP/REST protocol. But it's really hard to find good instructions or tutorials on the problem since I can't really find them. Maybe that's cause i'm probably using the wrong words on google. Unfortunately I have little relevant information. So if anyone can help me with finding relevant links to good online tutorials or howto's than those are very welcome.

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  • Storing n-grams in database in < n number of tables.

    - by kurige
    If I was writing a piece of software that attempted to predict what word a user was going to type next using the two previous words the user had typed, I would create two tables. Like so: == 1-gram table == Token | NextWord | Frequency ------+----------+----------- "I" | "like" | 15 "I" | "hate" | 20 == 2-gram table == Token | NextWord | Frequency ---------+------------+----------- "I like" | "apples" | 8 "I like" | "tomatoes" | 12 "I hate" | "tomatoes" | 20 "I hate" | "apples" | 2 Following this example implimentation the user types "I" and the software, using the above database, predicts that the next word the user is going to type is "hate". If the user does type "hate" then the software will then predict that the next word the user is going to type is "tomatoes". However, this implimentation would require a table for each additional n-gram that I choose to take into account. If I decided that I wanted to take the 5 or 6 preceding words into account when predicting the next word, then I would need 5-6 tables, and an exponentially increase in space per n-gram. What would be the best way to represent this in only one or two tables, that has no upper-limit on the number of n-grams I can support?

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  • hosting site on one web server and accessing a database on another

    - by tombull89
    I'm fairly sure this is the right place for this question, but if not please move it to the the right site. I have a number of sites on a 1and1 package (yeah, I know...) and I also have a subdomian that belongs to a college tutor. I have been playing around with PHP and MySQL databases on the subdomian site and would like to know if it is possible to run a database driven (i.e. blog) on one of my 1and1 sites. I could upgrade my package but if I'm only going to gain database functionality I'm not sure if I want to do it. Also, as 1and1 don't use cPanel I'm wondering how the databases would be managed...but I'll worry about that when (if) the time comes. Cheers!

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  • How to Script a backup for each database on an MSSQL Engine?

    - by Geo
    We need to backup 40 databases inside an MS SQL Server Engine. We backup each database with the following script: BACKUP DATABASE [dbname1] TO DISK = N'J:\SQLBACKUPS\dbname1.bak' WITH NOFORMAT, INIT, NAME = N'dbname1-Full Database Backup', SKIP, NOREWIND, NOUNLOAD, STATS = 10 GO declare @backupSetId as int select @backupSetId = position from msdb..backupset where database_name=N'dbname1' and backup_set_id=(select max(backup_set_id) from msdb..backupset where database_name=N'dbname1' ) if @backupSetId is null begin raiserror(N'Verify failed. Backup information for database ''dbname1'' not found.', 16, 1) end RESTORE VERIFYONLY FROM DISK = N'J:\SQLBACKUPS\dbname1.bak' WITH FILE = @backupSetId, NOUNLOAD, NOREWIND GO We will like to add to the script the functionality of taking each database and replacing it in the above script. Basically a script that will create and verify each database backup from an engine. I am looking for something like this: For each database in database-list sp_backup(database) // this is the call to the script above. End For any ideas?

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  • Writing datatable to database file, one record at a time

    - by Kevin
    I want to write a C# program that will read a row from a datatable (named loadDT) and update a database file (named Forecasts.mdb). My datatable looks like this (each day's value is a number representing kilowatts usage forecast): Hour Day1 Day2 Day3 Day4 Day5 Day6 Day7 1 519 520 524 498 501 476 451 My database file looks like this: Day Hour KWForecast 1 1 519 2 1 520 3 1 524 ... and so on. Basically, I want to be able to read one row from the datatable, and then extrapolate that out to my database file, one record at a time. Each row from the datatable will result in seven records written to the database file. Any ideas on how to go about this? I can connect to my database, the connection string works, and I can update and delete from the database. I just can't wrap my head around how to do this one record at a time.

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  • Writing datatable to database file, one record at a time in C#

    - by Kevin
    Hi! I want to write a C# program that will read a row from a datatable (named loadDT) and update a database file (named Forecasts.mdb). My datatable looks like this (each day's value is a number representing kilowatts usage forecast): Hour Day1 Day2 Day3 Day4 Day5 Day6 Day7 1 519 520 524 498 501 476 451 My database file looks like this: Day Hour KWForecast 1 1 519 2 1 520 3 1 524 ... and so on. Basically, I want to be able to read one row from the datatable, and then extrapolate that out to my database file, one record at a time. Each row from the datatable will result in seven records written to the database file. Any ideas on how to go about this? I can connect to my database, the connection string works, and I can update and delete from the database. I just can't wrap my head around how to do this one record at a time. Thanks in advance for any help and advice.

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  • How do I call functions of an object inside the same object?

    - by Roly
    I have the following Javascript code add_num = { f: function(html, num) { alert(this.page); }, page : function() { return parseInt(this.gup('page')); }, gup : function(name) { name = name.replace(/[\[]/,'\\\[').replace(/[\]]/,'\\\]'); var regex = new RegExp('[\\?&]'+name+'=([^&#]*)'); var results = regex.exec(window.location.href); if(results == null) return ''; else return results[1]; } } But when I call add_num.f() what I get from alert() is the actual code of page. That is, it returns function() { return parseInt(this.gup('page')); } I was expecting a numeric value and not any code at all.

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