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• SELECT SUM returns a row when there are no records

  - by Jose L Martinez-Avial

  Hi, I'm finding some problems with a query that returns the sum of a field from a table for all the records that meet certain conditions. I expected to receive a "No records found' when there were no records, but instead I'm receiving a null result. SQL> SELECT * FROM DUAL WHERE 1=2; no rows selected SQL> SELECT SUM(dummy) FROM DUAL WHERE 1=2; SUM(DUMMY) ---------- SQL> Is there any way to not receive any record in that case?

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• GAE datastore eager loading in python api

  - by tomus

  I have two models in relation one-to-many: class Question(db.Model): questionText = db.StringProperty(multiline=False) class Answer(db.Model): answerText = db.StringProperty(multiline=False) question = db.ReferenceProperty(Question, collection_name='answers') I have front-end implemented in Flex and use pyamf to load data. When i try to load all answers with related questions all works as desired and I can access field answer.question however in case of loading questions (e.g. by Questions.all() ), 'question.answers' remains empty/null (though on server/python side I can revise question.answers without problem - probably after lazy-loading). So is it possible to load all questions along with answers ? (I know this is possible in JPA Java api but what about python ?) Shoud I use additional setting, GQL query or django framework to make it work ?

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• Java or php tree structure problem

  - by agazerboy

  Hi All, I have all my data in my database. It has following 4 columns id source_clust target_clust result_clust 1 7 72 649 2 9 572 650 3 649 454 651 4 32 650 435 This data is like tree structure. source_clust and target_clust generate target_clust. target_clust can be source_clust or target_clust to make a new target_clust. Is there any php function or class that I can use to generate tree structure for my data???? I see this MySql site they are doing exactly what I need but I couldn't find how to implement that query in my data. Thanks ! Edited Is there any way in java to do it? if we have same data in array ??

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• Qooxdoo REST JSON request problem - unexpected token and then timeout

  - by freiksenet

  Hello! I am learning Qooxdoo framework and I am trying to make it work with a small Django web service. Django webservice just returns JSON data like this: { "name": "Football", "description": "The most popular sport." } Then I use the following code to query that url: var req = new qx.io.remote.Request(url, "GET", "application/json"); req.toggleCrossDomain(); req.addListener("completed", function(e) { alert(e.getContent()); }); req.send(); Unfortunately when I execute the code I get unexpected token error and then request timeouts. Uncaught SyntaxError: Unexpected token : Native.js:91013011 qx.io.remote.RequestQueue[246]: Timeout: transport 248 Native.js:91013011 qx.io.remote.RequestQueue[246]: 5036ms > 5000ms Native.js:91013013 qx.io.remote.Exchange[248]: Timeout: implementation 249 JSLint reports that this is a valid JSON, so I wonder why Qooxdoo doesn't parse it correctly.

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• Work-around for PHP5's PDO rowCount MySQL issue

  - by Steven Surowiec

  I've recently started work on a new project using PHP5 and want to use their PDO classes for it. The problem is that the MySQL PDO Driver doesn't support rowCount() so there's no way to run a query and then get the number of affected rows, or rows returned, which is a pretty big issue as far as I'm concerned. I was wondering if anyone else has dealt with this before and what you've done to work around it. Having to do a fetch() or fetchAll() to check if any rows were affected or returned seems like a hack to me, I'd rather just do $stmt-numRows() or something similar.

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• ASP.net displaying data from SQL data source

  - by c11ada

  hey all, im using linq2SQL to grab information from my SQL database, i have a gridview which shows all the top level information, in this case a list of groups (i.e admin, users and so on) when a user clicks say the admin group, i want to be able to show each member in that group, i have the following code which grabs the information from the database, DataClassesDataContext dc = new DataClassesDataContext(); GridViewRow row = GridView1.SelectedRow; var query1 = from p in dc.Users where p.groups.GroupID == Int32.Parse(row.Cells[1].Text) select new { p.Name, p.Address, p.Contact Number, p.Bio, }; i no i can use gridview again to display the results of the query, but this doesnt really look nice as it shows too much information at one, how would i go about having some sort of display which will show just one user at a time giving me the chance to click next and back ? thanks

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• Update DataBase on clicking in button, after editing gridview (not automatically saving in DB, but a

  - by gaponte69

  0 vote down star I am using GridView in asp .net and editing data with edit command field property (as we know after updating the edited row, we automatically update the database), and I want to use transactions (with begin to commit statement - including rollback) to commit this update query in database, after clicking in some button (after some events for example), not automatically to insert or update the edited data from grid directly to the DB...so I want to save them somewhere temporary (even many edited rows - not just one row) and then to confirm the transaction - to update the real tables in database... Any suggestions are welcomed... I've used some good links, but very helpful, like: http://www.asp.net/learn/data-access/tutorial-63-cs.aspx http://www.asp.net/learn/data-access/tutorial-66-cs.aspx etc... etc...

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• sql-server: how can I list distinct value of table in a single row, separated by comma

  - by RedsDevils

  I have the following Table: CREATE TABLE TEMP (ID INT,SEGMENT CHAR(1),SEGOFF INT,CHECKED SMALLDATETIME) INSERT INTO TEMP VALUES (1,'A',0,'2009-05-01') INSERT INTO TEMP VALUES (2,'B',1,'2009-05-01') INSERT INTO TEMP VALUES (3,'C',0,'2009-05-01') INSERT INTO TEMP VALUES (4,'A',0,'2009-05-02') INSERT INTO TEMP VALUES (5,'B',2,'2009-05-02') INSERT INTO TEMP VALUES (6,'C',1,'2009-05-02') INSERT INTO TEMP VALUES (7,'A',1,'2009-05-03') INSERT INTO TEMP VALUES (8,'B',0,'2009-05-03') INSERT INTO TEMP VALUES (9,'C',2,'2009-05-03') I would like to show Distinct SEGEMENT in Single row separated by comma (e.g: A,B,C) I try as Follow: DECLARE @SEGMENTList varchar(100) SELECT @SEGMENTList = COALESCE(@SEGMENTList + ', ', '') + SEGMENT FROM TEST SELECT @SEGMENTList It shows A, B, C, A, B, C, A, B, C What do I need to change my query? Thanks all!

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• InnoDB "Column count doesn't match value count at row 1"

  - by Webnet

  I'm having issues with a table. I'm using the following to create my insert query... $validatedData = array(); foreach ($post as $key => $value) { if ($key != 'submit' && $key != 'dz_tos' && $key != 'dz_billShip') { $validatedData[$key] = filter_var($value, FILTER_SANITIZE_STRING); } } mysql_query("INSERT INTO dz_users(".implode(array_keys($validatedData), ',').", dz_access_level) VALUES(\"".implode($validatedData, '\",\"')."\", 1)"); So every column has a value to match it. The problem is that I'm getting the SQL error: Column count doesn’t match value count at row 1 The database is an innoDB and all columns are varChar/Char except for the ID field which is an auto increment primary key.

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• Use AJAX to load webpage content into DIV

  - by arik-so

  Hello. I have a text field. When I type something into than text field, I want to load stuff into the DIV below. That's my code equivalent: <input type="text" onkeyup="/* I am not sure, how it's done, but I'll just write: */ document.getElementById('search_results').innerHTML = getContents('search.php?query='+this.value);" /><br/> <div id="search_results"></div> Hope you can help. Thanks in advance! EDIT: I would appreciate it if the solution did not involve using jQuery - as long as it's possible.

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• Finding parents where child collection does not contain an item with a specific property value

  - by Colin Bowern

  I am trying to get a list of parents where the child collection does not contain an item of a specific type. The LINQ equivalent would be something like: dataset.Where(x => x.Items.FirstOrDefault(y => y.Type.Code == "ABC") == null) The object model is Parent Child (Items) Type Code If Parent is my aggregate root, how would I model this in NHibernate criteria/query? Here's my first attempt: var results = session.CreateCriteria<Parent>() .CreateCriteria("Items") .CreateCriteria("Type") .Add(Restrictions.Not(Restrictions.Eq("Code", "ABC"))) .SetResultTransformer(Transformers.DistinctRootEntity) .List<Parent>(); This doesn't seem to return the right entities - it just returns them all.

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• generate unix timestamp from last time

  - by Nazmin

  hi guys, suppose i have one column in mysql database which is stated last time one equipment is up in h:i:s format (ex: 00:05:11) or 1d21h, means that the equipment is on since 5 min before, what is the best method i can convert this to unix timestamp, say if using php script how? or direct convert last unix timestamp using mysql function query. actually, i want to calculate for start time for this equipment uptime in unix timestamp where i have one column in mysql startcapture that will be deducted with last column to get start time. so starttime = startcapture - last (this last time that has to convert to unix timestamp based on now() - h:i:s ). but the problem is sometimes the format change from h:i:s to ex: 1d22h, if h:i:s means the equipment is up since ex: 00:05:11 min before and if 1d22h means the equipment already up 1 day 22 hours before. so the main things here is to convert last column to appropriate unix timestamp. please help guys, asap.

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• Select dynamic string has a different value when referenced in Where clause

  - by David

  I dynamically select a string built using another string. So, if string1='David Banner', then MyDynamicString should be 'DBanne' Select ... , Left( left((select top 1 strval from dbo.SPLIT(string1,' ')) //first word ,1) //first character + (select top 1 strval from dbo.SPLIT(string1,' ') //second word where strval not in (select top 1 strval from dbo.SPLIT(string1,' '))) ,6) //1st character of 1st word, followed by up to 5 characters of second word [MyDynamicString] ,... From table1 Join table2 on table1pkey=table2fkey Where MyDynamicString <> table2.someotherfield I know table2.someotherfield is not equal to the dynamic string. However, when I replace MyDynamicString in the Where clause with the full left(left(etc.. function, it works as expected. Can I not reference this string later in the query? Do I have to build it using the left(left(etc.. function each time in the where clause?

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• How to Filter more than one field using WPF AutoCompleteBox

  - by Drew

  i am trying to customize the suggestions on the AutoCompleteBox in the WPF Tool kit. Right now i have a last name field which when the user enters characters a query runs that retrieves the top 10 records based on that last name. i would also like to filter by first name, i tried splitting out the comma and searching by the last name and the characters entered in the first name. however, as soon as a space or comma is entered into the autocompletebox, the suggest functionality stops working, which I believe is because the ValueMemberPath property is set to be last name. Is there a work around for this, or a way to modify the ValueMemberPath to handle multiple values? Thanks!

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• BigDecimal precision not persisted with javax.persistence annotations

  - by dkaczynski

  I am using the javax.persistence API and Hibernate to create annotations and persist entities and their attributes in an Oracle 11g Express database. I have the following attribute in an entity: @Column(precision = 12, scale = 9) private BigDecimal weightedScore; The goal is to persist a decimal value with a maximum of 12 digits and a maximum of 9 of those digits to the right of the decimal place. After calculating the weightedScore, the result is 0.1234, but once I commit the entity with the Oracle database, the value displays as 0.12. I can see this by either by using an EntityManager object to query the entry or by viewing it directly in the Oracle Application Express (Apex) interface in a web browser. How should I annotate my BigDecimal attribute so that the precision is persisted correctly? Note: We use an in-memory HSQL database to run our unit tests, and it does not experience the issue with the lack of precision, with or without the @Column annotation.

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• Finding duplicate values in a SQL table - ADVANCED

  - by Alex

  It's easy to find duplicates with one field SELECT name, COUNT(email) FROM users GROUP BY email HAVING ( COUNT(email) > 1 ) So if we have a table ID NAME EMAIL 1 John [email protected] 2 Sam [email protected] 3 Tom [email protected] 4 Bob [email protected] 5 Tom [email protected] This query will give us John, Sam, Tom, Tom because they all have the same e-mails. But what I want, is to get duplicates with the same e-mails and names. I want to get Tom, Tom. I made a mistake, and allowed to insert duplicate name and e-mail values. Now I need to remove/change the duplicates. But I need to find them first.

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• Need some clarification on Bankers Algorithm

  - by Moonshield

  Hi, just a quick query about safe/unsafe states in Dijkstra's Banker's algorithm... If one of the processes in the snapshot of the system (for example the one below) already has all of its needs fulfilled and there are not sufficient resources available to fulfil the needs of any of the other processes, is the system in a safe state? I know normally we assume that once a process receives its required resources it will terminate soon after and return all resources, but is this assumption factored in when we calculate the state of the system? Allocated Maximum Available | A | B | A | B A | B ---+---+--- ---+---+--- ---+--- P1 | 1 | 2 P1 | 1 | 2 1 | 3 P2 | 5 | 3 P2 | 7 | 8

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• INNER JOIN vs LEFT JOIN performance in SQL Server

  - by Ekkapop

  I've created SQL command that use INNER JOIN for 9 tables, anyway this command take a very long time (more than five minutes). So my folk suggest me to change INNER JOIN to LEFT JOIN because the performance of LEFT JOIN is better, at first time its despite what I know. After I changed, the speed of query is significantly improve. I want to know why LEFT JOIN is faster than INNER JOIN? My SQL command look like below: SELECT * FROM A INNER JOIN B ON ... INNER JOIN C ON ... INNER JOIN D and so no

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• php multiple select drop down

  - by Chocho

  here is my mysql and php code layout: -i have 3 tables -tableA stores unique "person" information -tableB stores unique "places" information -tableC stores not unique information about a person and places they have "beenTo". here is how i layed out my form: -one big form to insert into "person" tableA; "beenTo" tableC in the form, a person mulitple selects "places" which get inserted into "beenTo" my question is, when i am editing a "person" how do i display what the user has already selected to appear on my multiple select options drop down menu? my drop down menu at the moment query "places" table and displays it in a multiple select drop down menu. its easier when a person have beenTo one place, the problem arrises when there is more than one "beenTo" places? any ideas. thanks

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• Detecting first time login of user into application (Google Appengine)

  - by Jake

  My app requires users to login using their google account. I have this set in my App.yamp file: url: /user/.* script: user.py login: required Now when any user tries to access files under /user/secret.py he will need to authenticate via google, which will redirect the user back to /user/secret.py after successful authentication. Now the problem I am facing is when the user is redirected back to the app, I cannot be sure if this is the first time the user has logged in or is it a regular user to my site who has come back again from just the user object which google passes using users.get_current_user() . I thus need to maintain state in the datastore to check if the user already exists or not everytime. If he does not exist i need to create a new entry with other application specific settings. My question is: Is there some easier way to handle this? without having to query the datastore to figure if this is a first time user or a regular one?

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• How to use MySql date_add in Nhibernate?

  - by jalchr

  This really puzzled for hours, I searched all over the internet, but got no working solution. Can someone point where the problem is ... thanks ! I created my own dialect class public class MySQLDialectExtended : MySQLDialect { public MySQLDialectExtended() { RegisterFunction("date_add_interval", new SQLFunctionTemplate(NHibernateUtil.Date, "date_add(?1, INTERVAL ?2 ?3)")); } } Then I try to use it as follows: query.Append( " ( date_add_interval(D.ApprovalDate, 1, YEAR) < current_timestamp() < date_add_interval(D.RenewalDate, -1, YEAR) )"); It fails with following exception: NHibernate.Hql.Ast.ANTLR.QuerySyntaxException : Exception of type 'Antlr.Runtime.NoViableAltException' was thrown. near line 1, column 677 where the column number is at the end of the first 'YEAR' word. Edit: here is my configuration <property name="dialect">MyCompanyName.MySQLDialectExtended, MyCompanyName</property> <property name="hbm2ddl.keywords">none</property>

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• Allowing optional variables with Rewrite Cond

  - by James Doc

  I currently have the following code: RewriteCond %{REQUEST_URI} !assets/ RewriteCond %{REQUEST_URI} !uploads/ RewriteRule ^([a-z|0-9_&;=-]+)/([a-z|0-9_&;=-]+) index.php?method=$1&value=$2 [NC,L] This works perfectly to redirect 'page/home' to 'index.php?method=page&value=home. However at some points I need to add an extra variable or two to the query string such as 'admin/useraccounts/mod/2'. When I simply tack on bits to the end of the rewrite rule it works if all the variables are 'page/home/rand/rand' or 'admin/useraccounts/mod/2', but if anything is missing such as 'page/home' I get a 404. What am I doing wrong? Many thanks.

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• How to get a list of items when using cassandra

  - by Blankman

  When using a nosql type datastore like Cassandra, how would you return a result set based on a column? e.g. SELECT * FROM Articles WHERE category='blah' ORDER BY datetime DESC is this something that you would store in a sql db and then pull the data from cassandra? Or can cassandra handle this type of query? (assuming millions of rows in a db) From what I understand, cassandra is great at key based lookups, confused if it can and should be used for getting a list of data back and paging that data also (and if it is highly performant)

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• Hibernate criteria -- alias

  - by Ignace

  Hello, I'm struggling a bit with the concept of alias in Hibernate. My situation is the following: Order @OneToMany(cascade=CascadeType.ALL,mappedBy="m_order") private Set<OrderDetail> m_details; OrderDetail @ManyToOne(cascade=CascadeType.ALL) @JoinColumn(name="product_id") private Product m_product; @ManyToOne(cascade=CascadeType.ALL) @JoinColumn(name="order_id") private Order m_order; DAO c.createAlias("m_details", "detail").createCriteria("detail.m_product").add(Expression.idEq(productId)); So I want to search every order that contains a product. However, with this query it keeps returning 0 orders and I don't really see what I'm doing wrong. Thanks!

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• SQL Average Data Based on Distance

  - by jsmith

  I'm pretty new to SQL. I have a database with records based on road/milepoints. My goal is to get an average value every 52.8 ft along the road. My related table has data every 15 ft, this table of course has a foreign key relating it to the primary table. If I wanted to pull out the average value every 52.8 ft, along a given milepost, how would I go about this? Example Data: RecID Begin_MP End_MP 100 0 0.56 RecID MP Value1 Value2 100 0 159 127.7 100 0.003 95.3 115.3 100 0.006 82.3 107 100 0.009 56.5 74.5 100 0.011 58.1 89.1 100 0.014 95.2 78.8 100 0.017 108.9 242.5 100 0.02 71.8 73.3 100 0.023 84.1 80.2 100 0.026 65.5 66.1 100 0.028 122 135.8 100 0.031 99.9 230.7 100 0.034 95.7 111.5 100 0.037 127.3 74.3 100 0.04 140.7 543.1 The first Data is an example of a Road. The second subset of data are the values I need to query out every 52.8 ft. Thank you

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