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  • LINQ weak relation between tables

    - by cleric
    I have two tables with a weak relation. I need get a text value from one table using a key from another. I am using the following C# LINQ code: City = rea.tRealEstateContact.tPostnumre != null ? rea.tRealEstateContact.tPostnumre.Bynavn : string.Empty But when the key cannot be found in the table 1(tPostnumre), an exception is thrown. How should I do this?

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  • How to refresh linked tables in an Access mdb when ODBC changes

    - by beta tester ben
    I can create an Access mdb and add a linked table to an Sql Server database via ODBC. If I change the Sql Server that the ODBC is connecting to with the ODBC control panel applet the mdb still connects to the original Sql Server until Access is restarted. Is there a way to relink these linked server tables without restarting Access? EDIT: I would like to do this in code

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  • HTML email: tables or divs?

    - by j-man86
    Does the HTML/CSS for an html email newsletter need to be in table format, or can I use DIVs with equal assurance it will display well cross email-client? I've downloaded a number of templates to see how they're done, upon which to base my own, and they all seem to use tables. Any insight much appreciated, thanks!

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  • Implementing database redundancy with sharded tables

    - by ensnare
    We're looking to implement load balancing by horizontally sharding our tables across a cluster of servers. What are some options to implement live redundancy should a server fail? Would it be effective to do (2) INSERTS instead of one ... one to the target shard, and another to a secondary shard which could be accessed should the primary shard not respond? Or is there a better way? Thanks.

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  • sql sum data from multiple tables

    - by Iulian
    I have 2 tables AP and INV where both have the columns [PROJECT] and [Value]. I want a query to return something like this : PROJECT | SUM_AP | SUM_INV I came up with the code below but it's returning the wrong results ( sum is wrong ). SELECT SUM(AP.Value) AS SUM_AP, SUM(INV.Value) AS SUM_INV FROM AP INNER JOIN INV ON (AP.[PROJECT] =INV.[PROJECT]) WHERE AP.[PROJECT] = 'XXXXX' GROUP BY AP.[PROJECT]

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  • sorting two tables (full join)

    - by Ruslan
    i'm joining tables like: select * from tableA a full join tableB b on a.id = b.id But the output should be: row without null fields row with null fields in tableB row with null fields in tableA Like: a.id a.name b.id b.name 5 Peter 5 Jones 2 Steven 2 Pareker 6 Paul null null 4 Ivan null null null null 1 Smith null null 3 Parker

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  • Updating multiple tables at the same time in Linq-to-SQL

    - by kiran
    How do I update two tables at the same time using Linq-to-SQL? var z = from a in db.Products join b in db.ProductSubcategories on a.ProductSubcategoryID equals b.ProductSubcategoryID join d in db.ProductCategories on b.ProductCategoryID equals d.ProductCategoryID select new { ProductName = a.Name, ProductCategory = d.Name, ProductSubCategory = b.Name, Cost = a.StandardCost, discontinuedDate = a.DiscontinuedDate, ProductId=a.ProductID };

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  • Correlated SQL Join Query from multiple tables

    - by SooDesuNe
    I have two tables like the ones below. I need to find what exchangeRate was in effect at the dateOfPurchase. I've tried some correlated sub queries, but I'm having difficulty getting the correlated record to be used in the sub queries. I expect a solution will need to follow this basic outline: SELECT only the exchangeRates for the applicable countryCode From 1. SELECT the newest exchangeRate less than the dateOfPurchase Fill in the query table with all the fields from 2. and the purchasesTable. My Tables: purchasesTable: > dateOfPurchase | costOfPurchase | countryOfPurchase > 29-March-2010 | 20.00 | EUR > 29-March-2010 | 3000 | JPN > 30-March-2010 | 50.00 | EUR > 30-March-2010 | 3000 | JPN > 30-March-2010 | 2000 | JPN > 31-March-2010 | 100.00 | EUR > 31-March-2010 | 125.00 | EUR > 31-March-2010 | 2000 | JPN > 31-March-2010 | 2400 | JPN costOfPurchase is in whatever the local currency is for a given countryCode exchangeRateTable > effectiveDate | countryCode | exchangeRate > 29-March-2010 | JPN | 90 > 29-March-2010 | EUR | 1.75 > 30-March-2010 | JPN | 92 > 31-March-2010 | JPN | 91 The results of the query that I'm looking for: > dateOfPurchase | costOfPurchase | countryOfPurchase | exchangeRate > 29-March-2010 | 20.00 | EUR | 1.75 > 29-March-2010 | 3000 | JPN | 90 > 30-March-2010 | 50.00 | EUR | 1.75 > 30-March-2010 | 3000 | JPN | 92 > 30-March-2010 | 2000 | JPN | 92 > 31-March-2010 | 100.00 | EUR | 1.75 > 31-March-2010 | 125.00 | EUR | 1.75 > 31-March-2010 | 2000 | JPN | 91 > 31-March-2010 | 2400 | JPN | 91 So for example in the results, the exchange rate, in effect for EUR on 31-March was 1.75. I'm using Access, but a MySQL answer would be fine too. UPDATE: Modification to Allan's answer: SELECT dateOfPurchase, costOfPurchase, countryOfPurchase, exchangeRate FROM purchasesTable p LEFT OUTER JOIN (SELECT e1.exchangeRate, e1.countryCode, e1.effectiveDate, min(e2.effectiveDate) AS enddate FROM exchangeRateTable e1 LEFT OUTER JOIN exchangeRateTable e2 ON e1.effectiveDate < e2.effectiveDate AND e1.countryCode = e2.countryCode GROUP BY e1.exchangeRate, e1.countryCode, e1.effectiveDate) e ON p.dateOfPurchase >= e.effectiveDate AND (p.dateOfPurchase < e.enddate OR e.enddate is null) AND p.countryOfPurchase = e.countryCode I had to make a couple small changes.

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  • CakePHP Test Fixtures Drop My Tables Permanently After Running A Test Case

    - by Frank
    I'm not sure what I've done wrong in my CakePHP unit test configuration. Every time I run a test case, the model tables associated with my fixtures are missing form my test database. After running an individual test case I have to re-import my database tables using phpMyAdmin. Here are the relevant files: This is the class I'm trying to test comment.php. This table is dropped after the test. App::import('Sanitize'); class Comment extends AppModel{ public $name = 'Comment'; public $actsAs = array('Tree'); public $belongsTo = array('User' => array('fields'=>array('id', 'username'))); public $validate = array( 'text' = array( 'rule' =array('between', 1, 4000), 'required' ='true', 'allowEmpty'='false', 'message' = "You can't leave your comment text empty!") ); database.php class DATABASE_CONFIG { var $default = array( 'driver' = 'mysql', 'persistent' = false, 'host' = 'project.db', 'login' = 'projectman', 'password' = 'projectpassword', 'database' = 'projectdb', 'prefix' = '' ); var $test = array( 'driver' = 'mysql', 'persistent' = false, 'host' = 'project.db', 'login' = 'projectman', 'password' = 'projectpassword', 'database' = 'testprojectdb', 'prefix' = '' ); } My comment.test.php file. This is the table that keeps getting dropped. <?php App::import('Model', 'Comment'); class CommentTestCase extends CakeTestCase { public $fixtures = array('app.comment', 'app.user'); function start(){ $this-Comment =& ClassRegistry::init('Comment'); $this-Comment-useDbConfig = 'test_suite'; } This is my comment_fixture.php class: <?php class CommentFixture extends CakeTestFixture { var $name = "Comment"; var $import = 'Comment'; } And just in case, here is a typical test method in the CommentTestCase class function testMsgNotificationUserComment(){ $user_id = '1'; $submission_id = '1'; $parent_id = $this-Comment-commentOnModel('Submission', $submission_id, '0', $user_id, "Says: A"); $other_user_id = '2'; $msg_id = $this-Comment-commentOnModel('Submission', $submission_id, $parent_id, $other_user_id, "Says: B"); $expected = array(array('Comment'=array('id'=$msg_id, 'text'="Says: B", 'submission_id'=$submission_id, 'topic_id'='0', 'ack'='0'))); $result = $this-Comment-getMessages($user_id); $this-assertEqual($result, $expected); } I've been dealing with this for a day now and I'm starting to be put off by CakePHP's unit testing. In addition to this issue -- Servral times now I've had data inserted into by 'default' database configuration after running tests! What's going on with my configuration?!

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  • Schema qualified tables with SQLAlchemy, SQLite and Postgresql?

    - by Chris Reid
    I have a Pylons project and a SQLAlchemy model that implements schema qualified tables: class Hockey(Base): __tablename__ = "hockey" __table_args__ = {'schema':'winter'} hockey_id = sa.Column(sa.types.Integer, sa.Sequence('score_id_seq', optional=True), primary_key=True) baseball_id = sa.Column(sa.types.Integer, sa.ForeignKey('summer.baseball.baseball_id')) This code works great with Postgresql but fails when using SQLite on table and foreign key names (due to SQLite's lack of schema support) sqlalchemy.exc.OperationalError: (OperationalError) unknown database "winter" 'PRAGMA "winter".table_info("hockey")' () I'd like to continue using SQLite for dev and testing. Is there a way of have this fail gracefully on SQLite?

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  • Fuzzy match two hash tables?

    - by alex
    Hi, I'm looking for ideas on how to best match two hash tables containing string key/value pairs. Here's the actual problem I'm facing: I have structured data coming in which is imported into the database. I need to UPDATE records which are already in the DB, however, it's possible that ANY value in the source can change, therefore I don't have a reliable ID. I'm thinking of fuzzy matching two rows, source and DB and make an "educated" guess if it should be updated and inserted. Any ideas would be greatly appreciated.

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  • C# code for viewev tables

    - by simon
    Can somebody write me a code, how to view data from tables in c# (using select statement)? I tried it myself and posted the code here, but i didn't get it right. Please help!

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  • Can ActiveRecord create tables outside of a migration?

    - by Munkymorgy
    I am working on a non Rails web app, so no migrations script by default. The Sequel ORM lets me create tables easily in a script: #!/usr/bin/env ruby require 'rubygems' require 'sequel' ## Connect to the database DB = Sequel.sqlite('./ex1.db') unless DB.table_exists? :posts DB.create_table :posts do primary_key :id varchar :title text :body end end Is there a way todo this with ActiveRecord outside of migrations?

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  • full text search on multiple fields in diferrent tables

    - by crisgomez
    Hi, I want to create a a full text search usng ms sql 2005. here is the structure of my table User-contains fields of Id, fname,lname,email,alternativeemail Attachment-contains fields of id, name,category,filenameorurl Certification-contains of fileds of id, title,school,sdate,edate EducationalBackground-contain of fields of, id,qualification,sdate,edate,school,fieldofstudy EmploymentDetails-contain of fields position, positionlevelid,specializationid,description now the relationship of user to the other table is one to many relationship. now how can I create an effective query to have quick full text search and return the values of the different tables?any help please

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  • Should I include user_id in multiple tables?

    - by Drarok
    I'm at the planning stages of a multi-user application where each user will only have access their own data. There'll be a few tables that relate to each other, so I could use JOINs to ensure they're accessing only their data, but should I include user_id in each table? Would this be faster? It would certainly make some of the queries easier in the long run. Thanks!

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  • Gtk+ Tables for Layout - Good or Bad?

    - by wag2639
    Hi, I'm just starting to play around with GTK+ and I wanted to stop bad habits before they happen. I see that GTK+ seems to be a little based in HTML/CSS and I was wondering if there are any reasons to avoid using tables for layout.

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  • SQL Select * from multiple tables

    - by zaf
    Using PHP/PDO is it possible to use a wildcard for the columns when a select is done on multiple tables and the returned array keys are fully qualified to avoid column name clash? example: SELECT * from table1, table2; gives: Array keys are 'table1.id', 'table2.id', 'table1.name' etc. I tried "SELECT table1.*,table2.* ..." but the returned array keys were not fully qualified so columns with the same name clashed and were overwritten.

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  • Partitioning mySQL tables that has foreign keys?

    - by Industrial
    Hi! What would be an appropriate way to do this, since mySQL obviously doesnt enjoy this. To leave either partitioning or the foreign keys out from the database design would not seem like a good idea to me. I'll guess that there is a workaround for this? Update 03/24: http://opendba.blogspot.com/2008/10/mysql-partitioned-tables-with-trigger.html http://stackoverflow.com/questions/1537219/how-to-handle-foreign-key-while-partitioning Thanks!

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