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• Delphi and mysql - Unable to connent to server..maybe custom connection reqd

  - by Steve

  I am coding an application for my company wherein i want to parse the results of a mysql query and display them in my application but i am facing a problem conecting to the database. the ip address of the server is : 172.30.192.20 and before i can ping it i have to add route on my pc something like this route add 172.30.192.0 mask 255.255.255.0 172.30.192.56 where 172.30.192.56 is the gateway Now whenever i try to connect 172.30.192.20 which is where the sql server is running my appplication instead connects to 172.30.192.56 i am coding the application in delphi and have used TmySQL After this didnt workout i tried an application called SQLwave. I just entered the server ip address and was able to connect to the database without any problems. it seems sqlwave uses mydac which is why even i tried using it but using the default connection options and setting i was still not able to connect. it seems sqlwave uses a custom connection using mydac i just want to know whats going wrong with my connection

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• SQL Outer joins

  - by dsquaredtech

  Three tables courses,registration,students columns in students firstname,lastname,studentid,major,admitdate,graddate,gender,dob columns in registration courseid,studentid columns in courses coursenumber,coursename,credits select statement I need to modify select lastname as 'Last Name',sum(credits) as 'Credits Registered For' from students as s inner join registration as r on s.studentid = r.studentid inner join courses as c on c.coursenumber = c.courseid group by last name; the question on the lab is... Modify the previous query to show all students, even if they have not registered for a class. You should have 14 rows. Students who are not registered will show NULL in output. I know this requires outer join of some sort but I'm not fully grasping these joins i've read multiple posts on here and other sites but can't seem figure it out.

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• Rails: What's the suggested approach to retrieve xml from an outside source

  - by Syrahn

  Rails newbie (though long time programmer) here. I'm writing an test app that retrieves data from several outside sources (think Twitter, RSS feeds, etc.) and under certain circumstances, it stores that data in a db (or presents it to the user). The data model and the views are trivial. What I'm having difficulty with is making the actual xml HTTP call to the outside source and deserialize the xml response so I can query/use it in my controller/helper. What library/gem should I use to accomplish this? I tried looking this up around the net, but only came up with some article from 2006 which, knowing how fast Rails has developed, might well be completely deprecated. Your help is much appreciated.

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• ASP.Net Gridview, How to activate Edit Mode based on ID (DataKey)

  - by Jon P

  I have a page, lets call it SourceTypes.aspx, that has a a GridView that is displaying a list of Source Types. Part of the GridView is a DataKey, SourceTypeID. If source TypeID is passed to the page via a query sting, how to I put the Gridview into Edit mode for the appropriate row based on the SourceTypeID? The GridView is bound to a SQlDataSource object. I have a feeling I am going to kick myself when the answer appears!! I have looked at Putting a gridview row in edit mode programmatically but it is some what lacking in specifics

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• the way to get a value from a hidden type correctly

  - by kawtousse

  hey, in a html table i construct in each row an edit buttton like the following: retour.append("<input type=\"hidden\" id=\"id_"+nomTab+"_"+compteur+"\" value=\""+object.getIdDailyTimeSheet()+"\" name=\"hd_"+compteur+"\" />"); this is the hidden type then i do the following: retour.append("<button id=edit name=edit type=button onClick= editarow()>"); retour.append("<img src=edit.gif />"); retour.append("</button>"); retour.append("</td>"); here i am using the hidden type to differenciate between my rows with it. Now I am trying to get the parameter called here: value=\""+object.getIdDailyTimeSheet() in my servlet to do an update query based on the IdDailyTimeSheet. I didn't untill know find the way to get this value every time i click the edit button (i do its submit with the javascript). thanks for help.

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• Can I stagger UpdatePanel updates in .NET?

  - by cusimar9

  I have a situation in which I select an account and I want to bring back its details. This is a single UpdatePanel round trip and its quite quick. In addition, I need to bring back some transactional information which is from a much bigger table and takes a couple of seconds for the query to come back. Ideally, I would like to put this into a second update panel and update this additional information once it has been received, but after the first update panel has updated i.e. the user sees: Change account See account details (almost instant) See transactional info (2 seconds later) The only way I can think of doing this is to use javascript to cause a SECOND postback once the account details have been retrieved to get the transaction information. Is there a better way?

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• Help me construct this Linq statement

  - by Geoffrey

  There should be a simple Linq query for what I'm trying to accomplish, but I'm producing some ugly code. I have two tables, one of issues and another of issue status. There is a one-to-many relationship between issue and issue status. When an issue is created an IssueStatus is also created with the status field set to "Open" when it is closed, another IssueStatus is created with the status field set to "Closed" ... but issues can be re-opened. It seems like I should be able to write something like this: public static List<Issue> FindOpenIssues(this IList<Issue> issues) { return ( from issue in issues from issueStatus in issue.issueStatus.OrderBy(x=>x.CreatedOn).Single() where issueStatus.Status == "Open" select issue ).ToList(); } This obviously fails, but there must be a clean way to do this? Thanks!

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• how to make a simple database app in android?

  - by Iakovl

  i am not an android developer, prefer C# but i want to play with andorid a bit since i have a android device, apologize in advance for it. i want to make a simple app in android with the basic CRUD functions (create, read, update and delete) while the basic option is to use SQLiteOpenHelper i've seen DAO generators (like greenDAO) that make life more simple as i see it. so the first question is what DAOgenerator to use (if it all)? next is how to properly show it, while i know i need listview i still don't figure out exactly how to bind the database to it and to the querys i'll make for proper display each time i make a new query from a "search" screen, to the main "list display" screen

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• How do you insert new entries into an Access db table through an ASP.net website?

  - by CGF

  I need to insert new records into an Access database. I'm using Visual Studio 2008 and firstly create a asp.net website. I can connect to the information in Access databse using dataview or gridview and can query a particular entry (ie. Proposal No. -brings up all details linking to that proposal). I can then edit the details of that proposal and this would update the Access Db. What I need to do is to have a form that simply enters new details for a new customer. ie. Enter name [__] Enter Adress[__]. Then for this to update the database. By using the gridview or dataview I am able to view all fields that exist in the table and edit them. Is there a way that I can get a blank gridview/dataview template (which includes all the fields in the table) and fill it out to then update the database? Thanks

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• Mysql SELECT with an OR across 2 columns

  - by Haroldo

  I'm creating a 'similar items' link table. i have a 2 column table. both columns contains product ids. The table is showing that these items are similar. However ids in the left column are more valuable. Say i want to select similar items to product '125b'. i only want 3 similar items to 125b. If there are any instances of 125b in col1 I would prefer these to finding 125b in col2. so i need a select statement along the lines of SELECT * FROM similar_items WHERE col_1={$id} OR col_2={$id} ORDER BY column(?) LIMIT 3 i do not want to do 2 separate queries ( ie query 2 if count(query1) <3 )

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• How can I handle this kind of exceptions (in Doctrine)

  - by ppavlovic

  Can you tell me how can I handle this kind of exceptions: Fatal error: Uncaught exception 'Doctrine_Connection_Exception' with message 'PDO Connection Error: SQLSTATE[HY000] [2013] Lost connection to MySQL server at 'reading initial communication packet', system error: 110' in ... It happens when connection with MySQL is lost during query. I need to handle this exception so I can show 500 error page so the crawlers do not cache page, and to redirect user to appropriate "Try again" page. P.S. I have a lot's of code, so I can not go trough all code to put try/catch block. I need something simple and yet effective.

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• Best approach to store username & password

  - by Zerotoinfinite

  Hi All, I have created a site in asp.net 3.5 & my query is this that I have only 2 or 3 login Id (user) who can login to my website, then what would be the better way to save the login details. What I know I am writing below, please let me know which would be the correct approach to achieve this also if their is any nice approach to get this done: 1: to save username and password in web.config file 2: to create a text file in directory and modify it 3: To use form authentication Please let me know the approach I can use to solve it. thanks in advance P.S. : I have to create only 2-3 users, or in future may be 1-2 more, that's it.

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• MySQL Group Results by day using timestamp

  - by Webnet

  I need to take the following query and pull the total order counts and sum of the orders grouped by day. I'm storing everything using timestamps. SELECT COUNT(id) as order_count, SUM(price + shipping_price) as order_sum, DAY(FROM_UNIXTIME(created)) as day FROM `order` WHERE '.implode(' AND ', $where).' I need to group by DAY but when I do for this past weekend's sales it takes my order_count and makes it 1 instead of 3. How can I pull the above values grouped by day? NOTE: The implode is used ONLY to define the time period (WHERE created = TIMESTAMP AND <= TIMESTAMP)

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• Use AJAX to check for a new message

  - by Luke

  Quite simply, I need to alert the end user when they have a new private message. From a combination of research and other opinion, I realise I need to use AJAX for this. The mysql query would be SELECT id FROM tbl_messages WHERE to_viewed = 1 So when someone sends a message, I want an alert to popup on the screen to inform the user without a page reload. I have absolutely no idea what I am doing, but know what I want. Really need help with this, AJAX is definitely something I want to improve as it opens up greater possibilities! Thanks

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• MySQL UPDATE WHERE IN for each listed value separately?

  - by Tom

  Hi, I've got the following type of SQL: UPDATE photo AS f LEFT JOIN car AS c ON f.car_id=c.car_id SET f.photo_status=1 , c.photo_count=c.photo_count+1 WHERE f.photo_id IN ($ids) Basically, two tables (car & photo) are related. The list in $ids contains unique photo ids, such as (34, 87, 98, 12). With the query, I'm setting the status of each photo in that list to "1" in the photo table and simultaneously incrementing the photo count in the car table for the car at hand. It works but there's one snag: Because the list can contain multiple photo ids that relate to the same car, the photo count only ever gets incremented once. If the list had 10 photos associated with the same car, photo_count would become 1 .... whereas I'd like to increment it to 10. Is there a way to make the incrementation occur for each photo individually through the join, as opposed to MySQL overthinking it for me? I hope the above makes sense. Thanks.

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• javascript / jQuery variable problem (possibly caching issue)

  - by waitinforatrain

  Standard AJAX query with jQuery: var globalTitle = ""; var pages = ["a", "b", "c"]; for (var i = 0; i < pages.length; i++) { createpage(pages[i]); } function createpage(title) { globalTitle=title; console.log (globalTitle); //All looks good here $.ajax({ url: "createpage.php?id=" + title, context: document.body, success: success }); } The success() function uses globaltitle which is why I had to declare it global. In the success() function though console.log (globalTitle); constantly gives me "a". It's like the variable is assigned but is then cached every time success() is called. Happens in FF 4 and Chrome 8. Any thoughts?

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• Creating a multi-row "table" as part of a SELECT

  - by Chad Birch

  I'm not really sure how to describe my question (thus the awful title), but it's related to this recent question. The problem would be easily solved if there was some way for me to create a "table" with 4 rows as part of my SELECT (to use with NOT IN or MINUS). What I mean is, I can do this: SELECT 1, 2, 3, 4; And will receive one row from the database: | 1 | 2 | 3 | 4 | But is there any way to receive the following (without using UNION, I don't really want a query that's potentially thousands of lines long with a long list)? | 1 | | 2 | | 3 | | 4 |

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• In Django, using __init__() method of non-abstract parent model to record class name of child model

  - by k-g-f

  In my Django project, I have a non-abstract parent model defined as follows: class Parent(models.Model): classType = models.CharField(editable=False,max_length=50) and, say, two children models defined as follows: class ChildA(Parent): parent = models.OneToOneField(Parent,parent_link=True) class ChildB(Parent): parent = models.OneToOneField(Parent,parent_link=True) Each time I create an instance of ChildA or of ChildB, I'd like the classType attribute to be set to the strings "ChildA" or "ChildB" respectively. What I have done is added an _ _ init_ _() method to Parent as follows: class Parent(models.Model): classType = models.CharField(editable=False,max_length=50) def __init__(self,*args,**kwargs): super(Parent,self).__init__(*args,**kwargs) self.classType = self.__class__.__name__ Is there a better way to implement and achieve my desired result? One downside of this implementation is that when I have an instance of the Parent, say "parent", and I want to get the type of the child object linked with "parent", calling "parent.classType" gives me "Parent". In order to get the appropriate "ChildA" or "ChildB" value, I need to write a "_getClassType()" method to wrap a custom sql query.

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• Most efficient way to Update with Linq2Sql

  - by pranay

  can I update my employee record as given in below function or i have to make query of employee collection first and than i update data public int updateEmployee(App3_EMPLOYEE employee) { DBContextDataContext db = new DBContextDataContext(); db.App3_EMPLOYEEs.Attach(employee); db.SubmitChanges(); return employee.PKEY; } or i have to do this public int updateEmployee(App3_EMPLOYEE employee) { DBContextDataContext db = new DBContextDataContext(); App3_EMPLOYEE emp = db.App3_EMPLOYEEs.Single(e => e.PKEY == employee.PKEY); db.App3_EMPLOYEEs.Attach(employee,emp); db.SubmitChanges(); return employee.PKEY; } But i dont want to use second option is there any efficient way to update data

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• How to schedule hundreds of thousands of tasks?

  - by wehriam

  We have hundreds of thousands of tasks that need to be run at a variety of arbitrary intervals, some every hour, some every day, and so on. The tasks are resource intensive and need to be distributed across many machines. Right now tasks are stored in a database with an "execute at this time" timestamp. To find tasks that need to be executed, we query the database for jobs that are due to be executed, then update the timestamps when the task is complete. Naturally this leads to a substantial write load on the database. As far as I can tell, we are looking for something to release tasks into a queue at a set interval. (Workers could then request tasks from that queue.) What is the best way to schedule recurring tasks at scale? For what it's worth we're largely using Python, although we have no problems using components (RabbitMQ?) written in other languages.

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• is NATURAL JOIN any better than SELECT FROM WHERE in terms of performance ?

  - by ashy_32bit

  Today I got into a debate with my project manager about Cartesian products. He says a 'natural join' is somehow much better than using 'select from where' because the later cause the db engine to internally perform a Cartesian product but the former uses another approach that prevents this. As far as I know, the natural join syntax is not any different in anyway than 'select from where' in terms of performance or meaning, I mean you can use either based on your taste. SELECT * FROM table1,table2 WHERE table1.id=table2.id SELECT * FROM table1 NATURAL JOIN table2 please elaborate about the first query causing a Cartesian product but the second one being somehow more smart

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• How to map one class against multiple tables with SQLAlchemy?

  - by tote

  Lets say that I have a database structure with three tables that look like this: items - item_id - item_handle attributes - attribute_id - attribute_name item_attributes - item_attribute_id - item_id - attribute_id - attribute_value I would like to be able to do this in SQLAlchemy: item = Item('item1') item.foo = 'bar' session.add(item) session.commit() item1 = session.query(Item).filter_by(handle='item1').one() print item1.foo # => 'bar' I'm new to SQLAlchemy and I found this in the documentation (http://www.sqlalchemy.org/docs/05/mappers.html#mapping-a-class-against-multiple-tables): j = join(items, item_attributes, items.c.item_id == item_attributes.c.item_id). \ join(attributes, item_attributes.c.attribute_id == attributes.c.attribute_id) mapper(Item, j, properties={ 'item_id': [items.c.item_id, item_attributes.c.item_id], 'attribute_id': [item_attributes.c.attribute_id, attributes.c.attribute_id], }) It only adds item_id and attribute_id to Item and its not possible to add attributes to Item object. Is what I'm trying to achieve possible with SQLAlchemy? Is there a better way to structure the database to get the same behaviour of "dynamic columns"?

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• WMI instrinsic events. Resources

  - by Nickolodeon

  Hi. I subscribe to usb inserted event like this select * FROM __INSTANCECREATIONEVENT WITHIN 3 WHERE TARGETINSTANCE ISA Win32_DiskDrive After inserting usb flash it blinks every 3 seconds. This is polling interval and intrinsic events work by polling object that's in query. Now, we know these types of events may be resource expensive. (Putting value greater then 3 sometimes chokes these events and client program doesn't get notified). Are there other ways to do that, so that usb doesn't get scanned all the time? May be there some extrinsic events available? Right now the only solution I see is to unsubscribe from event above once it trigerred and resubscribe to it in __INSTANCEDELETIONEVENT handler. Hm, althought deletionevent will also poll diskdrive controllers(

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• How to convet DataTable to List on runtype with out existin class property [closed]

  - by shamim

  Work on VS2010 C#,Have one DataTable ,want to convert this DataTable to List Suppose: Table dt; On run time want to create similar field from a datatable and fill fields in List.There is no existing class for list properties. ListName=TableName List property name=Table column name List Property type=Table column type List items=Table rows Note: Recently work on EF.To fullfill my project requirement, need to give flexibility to use to input and execute ESQL at runtime .I don’t want to put this execute result on datatable or List ,want to put this result on list. List has no existing class and property,don’t want to convert DataTable on list Type:DataRow If have any query please ask,Thanks in advanced.

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• Oracle ORA-01795 error in Rails

  - by Cyborgo

  Hi, I am using Oracle as database for my Rails applications and have got some pretty intense tables. I'm trying to find the particular entries using a query like this Author.all( :conditions => { :name => names } ) I have been working SQlite all along and just migrated to Oracle which complains that IN clause has more than 1000 entries. Obvious workaround would be to break it into subclauses for which I need to write some raw sql queries. Is there anything in Rails that facilitate this?

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