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  • How to concatenate text on existing database entry?

    - by Starx
    I have a table, whose fields are id, name, link the link holds the name of the page like "link" = "index.php". Now I want to update this field and add "page=" in front of "index.php". Using this method I would like to update every entry in my table. My desired SQL syntax need to be something like this UPDATE mytable set link= 'page=' + <existing value of link> WHERE 1; I am using 'WHERE 1;' to denote every row. Anyone know how to accomplish this?

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  • Should I use a huge composite primary key or just a unique id?

    - by Jack
    I have been trying to do web scraping of a particular site and storing the results in a database. My original assumptions about the data allowed a schema where I could use fairly reasonable composite primary keys (usually containing only 2 or 3 fields) but as time went on, I realized that my original assumptions about the data were wrong and my primary keys were not as unique as I thought they were, so I have slowly been expanding them to contain more and more fields. In fact, I have recently come to believe that their database has no constraints whatsoever. Just today, I have finally expanded my a primary key for one of my tables to contain every field in that table and I thought now would be a good time to ask: is it better to add an auto-incrementing column that is just a unique id or just leave a composite primary key on the entire table?

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  • sql unite fields to one result

    - by none
    i know this is a "not build in" or "the way dba thinks" but a programmer aproach , How could one request from 3 fields to get the one that is not null, into a result filed. lets say we have a table with f1,f2,f3,f4,f5. lets say f2,f3,f4 are the same type. lets say the content of the table be tupples of (key1,null,null,value1,value2) (key2,null,value3,value4,value5) (key3,null,null,null,value6) now if we return the first tupple then we get (key1) we get (key1,value1,value2) if we ask for key2 we get (key1,value3,value5) if we ask for key3 we get (key1,null,value6) how is it possible to get the fields in the priority of if you have value in f2, then its set into the returned field, only then if we have value in f3 then its set into the middle returned field, only then if we have value in f4 then its set into the middle returned field the main goal is to get the result into a sigel feild and prevent the overhead work needed at the result end.

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  • Is it possible to create an enum whose instance can't be created but can be used for readonly purpos

    - by Shantanu Gupta
    I created an enum where I stored some table names. I want it to be used to get the name of the table like ds.Tables[BGuestInfo.TableName.L_GUEST_TYPE.ToString()]. public class a { public enum TableName : byte { L_GUEST_TYPE = 0 ,L_AGE_GROUP = 1 ,M_COMPANY = 2 ,L_COUNTRY = 3 ,L_EYE_COLOR = 4 ,L_GENDER = 5 ,L_HAIR_COLOR = 6 ,L_STATE_PROVINCE = 7 ,L_STATUS = 8 ,L_TITLE = 9 ,M_TOWER = 10 ,L_CITY = 11 ,L_REGISTER_TYPE = 12 } } class b { a.TableName x; //trying to restrict this ds.Tables[a.TableName.L_GUEST_TYPE] //accessible and can be used like this } This is my enum. Now I have not created any instance of this enum so that no one can use it for other than read only purpose. For this enum to be accessible in outer classes as well I have to make it public which means some outer class can create its object as well. So what can i do so as to restrict its instance creation.

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  • Need to get all referrals ID with using MYSQL

    - by Fero
    Hi all, I having a referral table like below. > id referredByID referrerID > > 1001 1 2 > > 1002 2 3 > > 1003 2 4 > > 1004 5 7 From the above table structure i need to get the users whom i referred and the users whom are referred by their referrals. For Example: I am referredByID-1 I referred the ID - 2 Now the ID - 2 referred ID -3 And in the same case ID-2 referred ID - 4 Now my output needs to be look like: Referrals Done By Me: id - 2 id - 3 id - 4 How can this be done using MYSQL. Any help will be appreciated.. Thanks in advance...

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  • MySQL Multiple "AND" Query

    - by Mark J
    I have a table with 2 columns (see below). A member can have multiple responses to a question RESPONSES --------- member_id INT response_id INT SAMPLE DATA member_id -- response_id 1 -- 3 1 -- 5 2 -- 1 2 -- 5 2 -- 9 3 -- 1 3 -- 5 3 -- 6 What I need to do is query the table for member that meet ALL response criteria. For example I need to select all members that have a response_id of 1 AND 5. I am using the following query: SELECT DISTINCT member_id FROM responses WHERE response_id = 1 AND response_id = 5. I would expect to get back member_id's 2,3. However I am getting nothing returned. I used EXPLAIN and it shows there is an error in my where query. What am I doing wrong? Also, is there a function similar to IN where all the criteria must be met in order to return true? Thanks for your help.

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  • PHP fetch all Twitter Followers and compare them to friends

    - by ArneRie
    Hi, iam looking for performant way to do the following: User login Fetch all Friends from Twitter Fetch all Followers from Twitter Display all Friends wich aren't Followers The Problem: How to do this in a performant way? An user can have up to 2 Million Friends or Followers. In the moment im Storing both inside an sqllite table an compare them through an loop. When the user comes back the table is cleared and process starts again. This works finde on 100 - 1000 Friends.. but will be tricky with 500000 Friends. I cant cache the lists because they can change every moment.. Does someone knows a good way to handle such big amount of data?

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  • Sending mail from html through php will return to php page. It should be in the same contact form. How to do it?

    - by Ershad
    Hi, I have a html page with all images and other text. Below i have the contact form. i am new to php. I have used php to send mail. But when i click on send button,it is going to backend.php. And i have a blank page. What i need is it should in the same page. I have done some javascript to show and hide div's. With this i am showing a thank u msg in the same page. But i dont want to redirect browser to show it is going to backend.php.TO be in the same page i have redirected php to another window. My code is - backend.php <?php if($_POST['message']) { $body = "Name: ".$_POST['name']; $body .= "<br>Email: ".$_POST['email']; $body .= "<br>Phone/Mobile: ".$_POST['phone'] $body .= "<br>Address: ".$_POST['address'] $body .= "<br>Message: ".$_POST['msg'] if(mail("[email protected]","Subjects",$body)) echo 'true'; else echo 'false;'; } ?> form code - <form onsubmit="return validateFormOnSubmit(this)" action="backend.php" method="post" target="_blank"> <table align="left"> <tbody> <tr> <td align="left"><label for="name">Enter your name:</label> <label style="color:red;display:none;font-size:18px;" Id="namestar">*</label></td> </tr> <tr><td align="left"><input Id="name" name="name" style="width:515px;" size="35" maxlength="50" type="text"></td></tr> <tr ><td height="12px"/></tr> <tr> <td align="left"><label for="email">Email Address:</label> <label style="color:red;display:none;font-size:18px;" Id="emailstar">*</label></td> </tr> <tr><td align="left"><input Id="email" name="email" style="width:515px;" type="text"></td></tr> <tr><td height="12px"/></tr> <tr> <td align="left"><label for="phone">Phone/Mobile:</label><label style="color:red;font-size:18px;display:none;" Id="phonestar">*</label></td> </tr> <tr><td align="left"><input Id="phone" name="phone" style="width:515px;" type="text"></td></tr> <tr><td height="12px"/></tr> <tr> <td align="left"><label for="address">Your Address:</label><label style="color:red;font-size:18px;display:none;" Id="addressstar">*</label></td> </tr> <tr><td align="left"><input id="address" name="address" style="width:515px;" type="text"></td></tr> <tr><td height="12px"/></tr> <tr> <td align="left"><label for="msg">Enter Your Comments / Suggestions / Enquiries</label><label style="color:red;font-size:18px;display:none;" Id="messagestar">*</label></td> </tr> <tr><td align="left"><textarea id="msg" name="msg" style="width:515px;height:100px;" type="text"></textarea></td></tr> <tr><td height="12px"/></tr> <tr> <td align="right"><table align="left"> <tbody> <tr > <td style="width:160px;"/> <td style="width:250px;" ><label Id="mandatory" style="display:none;color:red;" >* Mandatory fields</label></td> <td ><input type="submit" name="send" value="send" /></td><td > <input type="reset" name="reset" value="reset" onclick="resetAll()" /></td></tr> </tbody> </table> </td> </tr> </tbody> </table>

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  • Add Many-to-Many Entity Framework

    - by tomcamara
    I've got a question: I have 3 tables: Users Menu UserMenu UserMenu contains IdMenu and IdUser. In My DataModel Entity Framework 4.0, I'm filling my User Model and filling User.Menu (Menu is Navigation Properties) with an existing Menu of my table Menu. I have to save User and Save each related menu item in UserMenu table. I get the following exception: The ObjectStateManager does not contain an ObjectStateEntry with a reference to an object of type 'SGGED.Model.Menu'. Code Users objUser = new Users(); objUser.name = itemUsers.name.Trim(); objUser.email = itemUsers.email.Trim(); objUser.password = Util.HashString("12345"); objUser.effdt = DateTime.Now; objData.Users.AddObject(objUser); foreach (var itemMenu in itemUsers.Menu) { objData.ObjectStateManager.ChangeObjectState(itemMenu, EntityState.Unchanged); } affRows = objData.SaveChanges(); Whats the way to handle this issue? Best Regards, Miltom Camara

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  • How do I map nested generics in NHibernate

    - by Gluip
    In NHibernate you can map generics like this <class name="Units.Parameter`1[System.Int32], Units" table="parameter_int" > </class> But how can I map a class like this? Set<T> where T is a Parameter<int> like this Set<Parameter<int>> My mapping hbm.xml looking like this fails <class name="Set`1[[Units.Parameter`1[System.Int32], Units]],Units" table="settable"/> I simplified my mappings a little to get my point accross very clearly. Basically I want NHibernate to map generic class which has has generic type parameter. Want I understand from googling around is that NHibernate is not able to parse the name to the correct type in TypeNameParser.Parse() which result in the following error when adding the mapping to the configuration System.ArgumentException: Exception of type 'System.ArgumentException' was thrown. Parameter name: typeName@31 Anybody found a way around this limitation?

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  • Fulltext search not returning expected results

    - by Puneet
    I am experimenting with SQL Server full text search. I have a simple Categories table with Id as the primary key: CREATE TABLE [dbo].[Category]( [Id] [int] IDENTITY(1,1) NOT NULL, [CategoryName] [varchar](100) NOT NULL, ) My Query is: SELECT * FROM FREETEXTTABLE (Category, CategoryName, 'music') AS F INNER JOIN Category C ON F.[Key] = C.Id ORDER BY F.Rank DESC This returns me several records with the word music in them, but it does NOT return any record with word ‘musical’. Although, it can be said that the string being searched is not very big and using the LIKE operator will resolve it. I would like to use fulltext search because this simple example is going to be extended to include other tables and fileds.

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  • Is it possible for a Grails Domain to have no 'id'?

    - by firnnauriel
    Is it possible to create a table that has no 'id'? For example, this is my domain: class SnbrActVector { int nid String term double weight static mapping = { version false id generator: 'identity' } static constraints = { } } When I run this SQL statement, it fails: insert into snbr_act_vector values (5, 'term', 0.5) I checked the table and 'id' is already set to autoincrement. I'm thinking that another option is to remove the 'id' itself. Or is there another workaround for this? Please assume that it is not an option to change the givent SQL statement.

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  • MySQL Query to receive random combinations from two tables.

    - by Michael
    Alright, here is my issue, I have two tables, one named firstnames and the other named lastnames. What I am trying to do here is to find 100 of the possible combinations from these names for test data. The firstnames table has 5494 entries in a single column, and the lastnames table has 88799 entries in a single column. The only query that I have been able to come up with that has some results is: select * from (select * from firstnames order by rand()) f LEFT JOIN (select * from lastnames order by rand()) l on 1=1 limit 10; The problem with this code is that it selects 1 firstname and gives every lastname that could go with it. While this is plausible, I will have to set the limit to 500000000 in order to get all the combinations possible without having only 20 first names(and I'd rather not kill my server). However, I only need 100 random generations of entries for test data, and I will not be able to get that with this code. Can anyone please give me any advice?

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  • Left outer joins that don't return all the rows from T1

    - by Summer
    Left outer joins should return at least one row from the T1 table if it matches the conditions. But what if the left outer join performs a join successfully, then finds that another criterion is not satisfied? Is there a way to get the query to return a row with T1 values and T2 values set to NULL? Here's the specific query, in which I'm trying to return a list of candidates, and the user's support for those candidates IF such support exists. SELECT c.id, c.name, s.support FROM candidates c LEFT JOIN support s on s.candidate_id = c.id WHERE c.office_id = 5059 AND c.election_id = 92 AND (s.user_id = 2 OR s.user_id IS NULL) --This line seems like the problem ORDER BY c.last_name, c.name The query joins the candidates and support table, but finds that it's a different user who supported this candidate (user_id=3, say). Then the candidate disappears entirely from the result set.

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  • how to view associated click function code

    - by llamerr
    For example, i associate following function with some element $('table#users tbody tr:first #save').click(function(){ $(this).closest('tr').remove(); }); Now, if i don't know where this function is stored, is there a way to view associated with click() code? In above example, i want a way to view that in firebug, or in another way $(this).closest('tr').remove(); If I'm writing in console following, i'm get a link to dom inspector >>> ($('table#users tbody tr:first #save').click) function() but link is for jquery library, not the code i want.

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  • Scrapping *.aspx content using Python

    - by tomato
    I'm having difficulties scrapping dynamically generated table in ASPX. Trying to scrap the gas prices from a site like these GasPrices. I can extract all the information in the gas price table (address, time submitted etc.), except for the actual gas price. Is there a way I could scrap the gas prices? i.e. somehow get a text representation of it. I'm not very familiar with ASP/ASPX - but what's being generated now is not showing up in the final HTML. I'm using Python to do the scrapping, but that's irrelevant unless there's a specific library...

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  • Scrapping *.aspx content using Python

    - by tomato
    I'm having difficulties scrapping dynamically generated table in ASPX. Trying to scrap the gas prices from a site like these GasPrices. I can extract all the information in the gas price table (address, time submitted etc.), except for the actual gas price. Is there a way I could scrap the gas prices? i.e. somehow get a text representation of it. I'm not very familiar with ASP/ASPX - but what's being generated now is not showing up in the final HTML. I'm using Python to do the scrapping, but that's irrelevant unless there's a specific library...

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  • T-SQL Self Join in combination with aggregate function

    - by Nick
    Hi, i have the following table. CREATE TABLE [dbo].[Tree]( [AutoID] [int] IDENTITY(1,1) NOT NULL, [Category] [varchar](10) NULL, [Condition] [varchar](10) NULL, [Description] [varchar](50) NULL, CONSTRAINT [PK_Tree] PRIMARY KEY CLUSTERED ( [AutoID] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] GO the data looks like this: INSERT INTO [Test].[dbo].[Tree] ([Category] ,[Condition] ,[Description]) VALUES ('1','Alpha','Type 1') INSERT INTO [Test].[dbo].[Tree] ([Category] ,[Condition] ,[Description]) VALUES ('1','Alpha','Type 1') INSERT INTO [Test].[dbo].[Tree] ([Category] ,[Condition] ,[Description]) VALUES ('2','Alpha','Type 2') INSERT INTO [Test].[dbo].[Tree] ([Category] ,[Condition] ,[Description]) VALUES ('2','Alpha','Type 2') go I try now to do the following: SELECT Category,COUNT(*) as CategoryCount FROM Tree where Condition = 'Alpha' group by Category but i wish also to get the Description for each Element. I tried several subqueries, self joins etc. i always come to the problem that the subquery cannot return more than one record. The problem is caused by a poor database design which i cannot change and i run out of ideas to get this done in a single query ;-(

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  • Split string on first two colons

    - by Mark Miller
    I would like to split a column of strings on the first two colons, but not on any subsequent colons: my.data <- read.table(text=' my.string some.data 12:34:56:78 -100 87:65:43:21 -200 a4:b6:c8888 -300 11:bb:ccccc -400 uu:vv:ww:xx -500', header = TRUE) desired.result <- read.table(text=' my.string1 my.string2 my.string3 some.data 12 34 56:78 -100 87 65 43:21 -200 a4 b6 c8888 -300 11 bb ccccc -400 uu vv ww:xx -500', header = TRUE) I have searched extensively and the following question is the closest to my current dilemma: Split on first comma in string Thank you for any suggestions. I prefer to use base R.

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  • Are conditional subqueries optimized out, if the condition is false?

    - by Tobias Schulte
    I have a table foo and a table bar, where each foo might have a bar (and a bar might belong to multiple foos). Now I need to select all foos with a bar. My sql looks like this SELECT * FROM foo f WHERE [...] AND ($param IS NULL OR (SELECT ((COUNT(*))>0) FROM bar b WHERE f.bar = b.id)) with $param being replaced at runtime. The question is: Will the subquery be executed even if param is null, or will the dbms optimize the subquery out? We are using mysql, mssql and oracle. Is there a difference between these regarding the above?

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  • MySQL: Return grouped fields where the group is not empty, effeciently

    - by Ryan Badour
    In one statement I'm trying to group rows of one table by joining to another table. I want to only get grouped rows where their grouped result is not empty. Ex. Items and Categories SELECT Category.id FROM Item, Category WHERE Category.id = Item.categoryId GROUP BY Category.id HAVING COUNT(Item.id) > 0 The above query gives me the results that I want but this is slow, since it has to count all the rows grouped by Category.id. What's a more effecient way? I was trying to do a Group By LIMIT to only retrieve one row per group. But my attempts failed horribly. Any idea how I can do this? Thanks

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  • getting the bounds of a cell in groupedtable.

    - by praseed
    hi friends... how can i get the bounds of a row in a cell in a grouped table..My intention is to adjust the table view whenever the keyboard pops up. wat i have is a groupedtable with each cell having a textfield as subview of its contentview.. how can i get the bounds of the row in a cell, whenever user taps on a particular textfield. i need the bounds of the row so that i can adjust the view whenever keyboard pops up. Pls help me to find a solution. i am new to iphone development.

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  • Django Template - Convert python list into a javascript object

    - by amcashcow
    I am working on a django / python website I have a page where I want to display a table of search results The list of results is passed in to the template as normal I also want to make this list of objects accessible to the javascript code My first solution was just create another view that returned json format. But each page load required calling the query twice. So then I tried only downloading the data using the json view and printing the table using javascript. but this is also not desirable as now the presentation layer is mixed into the javascript code. is there a way to create a javascript object from the python list as the page is rendered?

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  • How to set the pointer to the current row in the Datagridview in C#

    - by user286546
    I have a datagridview on the Windows Form in c#. I am updating and filling the table adapter on the cell event. The problem is that When I go to lower half of the datagrid which is not visible until I scroll down, as I click any cell, the table adapter is filled and updated and the pointerpoints to the very first row. Any suggestion on how to fix it. I have a ideas to record the top row of the datagridview that is visible and set the pointer to that row. But how to do it?

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  • Are Triggers Based On Queries Atomic?

    - by David
    I have a table that has a Sequence number. This sequence number will change and referencing the auto number will not work. I fear that the values of the trigger will collide. If two transactions read at the same time. I have ran simulated tests on 3 connections @ ~1 million records each and no collisions. CREATE TABLE `aut` ( `au_id` int(10) NOT NULL AUTO_INCREMENT, `au_control` int(10) DEFAULT NULL, `au_name` varchar(50) DEFAULT NULL, `did` int(10) DEFAULT NULL, PRIMARY KEY (`au_id`), KEY `Did` (`did`) ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=latin1 TRIGGER `binc_control` BEFORE INSERT ON `aut` FOR EACH ROW BEGIN SET NEW.AU_CONTROL = (SELECT COUNT(*)+1 FROM aut WHERE did = NEW.did); END;

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