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  • Using memtables in sql. When is it reasonable and is it safe?

    - by Spiros
    I was just reading an update from a friend's project, mentioning the use of memtables to store data temporatily and then flush to a table on disk. Up to now, I have never faced a situation where I would use a memtable, or a situation where I would think the use of a mem table would be beneficial; so I wonder, when would someone use mem tables? what makes a memtable (appart from access speed) a reasonable choice? and how safe is it, even for temp data? there is always the limitation of available physical memory.

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  • Will MyISAM type tables work better than InnoDB for large numbers of columns?

    - by Ethan
    I have a MySQL InnoDB table with 238 columns. 56 of them are TEXT type, 27 are VARCHAR(255). I am getting MySQL error 139 when users insert data sometimes. After research I found that I'm probably running into InnoDB row size/column size/column count limitations. (I'm putting it that way because the specific limits among those three things are interdependent.) Docs on InnoDB give an idea of the limits. If I switch this table to MyISAM is it likely to solve the problem? I understand the maximum row size of 65,535 bytes. I think I'm hitting InnoDB's additional 8000 byte limit somehow. Switching to PostgreSQL is also a remote option, but would take much longer.

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  • RoR function help

    - by Aviatrix
    Can someone write a function for me on RoR , i simply don't have the time to study Ruby and RoR for just one time use. The function should do the following things : 1) have an array with variables 2) for each variable in the array execute 4-5 other functions get the results and insert them in another table in the same DB table name - refined CityName varchar Subdomain varchar = the varriable in the array Nearby text State varchar ZipCodes text AreaCodes text Some of the functions return arrays. i will really apreciate the help ! Thanks in advance.

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  • LINQ DataLoadOptions - Retrieval of data via Fulltext/Broken Foreign Key Relationship

    - by Alex
    I've hit a brick wall: I have an SQL Function: FUNCTION [dbo].[ContactsFTS] (@searchtext nvarchar(4000)) RETURNS TABLE AS RETURN SELECT * FROM Contacts INNER JOIN CONTAINSTABLE(Contacts, *, @searchtext) AS KEY_TBL ON Contacts.Id = KEY_TBL.[KEY] which I am calling via LINQ public IQueryable<ContactsFTSResult> SearchByFullText(String searchText) { return db.ContactsFTS(searchText); } I am projecting the ContactsFTSResult collection into a List<Contact> which is then given to my viewmodel. Here is the problem: My Contacts table (and therefore the Contact object created via LINQ to SQL) has multiple FK relationships to other information, such as Contact.BillingAddressId is an FK to an Address.Id. That information is missing after I do the fulltext search (e.g. if I try to access Contact.BillingAddress it is null). Can I add this information somehow via DataLoadOptions? I tried LoadWith<Contact>(c => c.BillingAddress) but this doesn't work, I assume because of the fact that I'm calling the function instead of doing the whole query via LINQ.

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  • How to create a backup from SqlAlchemy?

    - by swilliams
    I'm writing a Pylons app, and am trying to create a simple backup system where every table is serialized and tarred up into a single file for an administrator to download, and use to restore the app should something bad happen. I can serialize my table data just fine using the SqlAlchemy serializer, and I can deserialize it fine as well, but I can't figure out how to commit those changes back to the database. In order to serialize my data I am doing this: from myproject.model.meta import Session from sqlalchemy.ext.serializer import loads, dumps q = Session.query(MyTable) serialized_data = dumps(q.all()) In order to test things out, I go ahead and truncation MyTable, and then attempt to restore using serialized_data: from myproject.model import meta restore_q = loads(serialized_data, meta.metadata, Session) This doesn't seem to do anything... I've tried calling a Session.commit after the fact, individually walking through all the objects in restore_q and adding them, but nothing seems to work. What am I missing? Or is there a better way to do what I'm aiming for? I don't want to shell out and directly touch the database, since SqlAlchemy supports different database engines.

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  • PHP: Strange behaviour while calling custom php functions

    - by baltusaj
    I am facing a strange behavior while coding in PHP with Flex. Let me explain the situation: I have two funcions lets say: populateTable() //puts some data in a table made with flex createXML() //creates an xml file which is used by Fusion Charts to create a chart Now, if i call populateTable() alone, the table gets populated with data but if i call it with createXML(), the table doesn't get populated but createXML() does it's work i.e. creates an xml file. Even if i run following code, only xml file gets generated but table remains empty whereas i called populateTable() before createXML(). Any idea what may be going wrong? MXML Part <mx:HTTPService id="userRequest" url="request.php" method="POST" resultFormat="e4x"> <mx:request xmlns=""> <getResult>send</getResult> </mx:request> and <mx:DataGrid id="dgUserRequest" dataProvider="{userRequest.lastResult.user}" x="28.5" y="36" width="525" height="250" > <mx:columns> <mx:DataGridColumn headerText="No." dataField="no" /> <mx:DataGridColumn headerText="Name" dataField="name"/> <mx:DataGridColumn headerText="Age" dataField="age"/> </mx:columns> PHP Part <?php //-------------------------------------------------------------------------- function initialize($username,$password,$database) //-------------------------------------------------------------------------- { # Connect to the database $link = mysql_connect("localhost", $username,$password); if (!$link) { die('Could not connected to the database : ' . mysql_error()); } # Select the database $db_selected = mysql_select_db($database, $link); if (!$db_selected) { die ('Could not select the DB : ' . mysql_error()); } // populateTable(); createXML(); # Close database connection } //-------------------------------------------------------------------------- populateTable() //-------------------------------------------------------------------------- { if($_POST['getResult'] == 'send') { $Result = mysql_query("SELECT * FROM session" ); $Return = "<Users>"; $no = 1; while ( $row = mysql_fetch_object( $Result ) ) { $Return .= "<user><no>".$no."</no><name>".$row->name."</name><age>".$row->age."</age><salary>". $row->salary."</salary></session>"; $no=$no+1; $Return .= "</Users>"; mysql_free_result( $Result ); print ($Return); } //-------------------------------------------------------------------------- createXML() //-------------------------------------------------------------------------- { $users=array ( "0"=>array("",0), "1"=>array("Obama",0), "2"=>array("Zardari",0), "3"=>array("Imran Khan",0), "4"=>array("Ahmadenijad",0) ); $selectedUsers=array(1,4); //this means only obama and ahmadenijad are selected and the xml file will contain info related to them only //Extracting salaries of selected users $size=count($users); for($i = 0; $i<$size; $i++) { //initialize temp which will calculate total throughput for each protocol separately $salary = 0; $result = mysql_query("SELECT salary FROM userInfo where name='$users[$selectedUsers[$i]][0]'"); $row = mysql_fetch_array($result)) $salary = $row['salary']; } $users[$selectedUsers[$i]][1]=$salary; } //creating XML string $chartContent = "<chart caption=\"Users Vs Salaries\" formatNumberScale=\"0\" pieSliceDepth=\"30\" startingAngle=\"125\">"; for($i=0;$i<$size;$i++) { $chartContent .= "<set label=\"".$users[$selectedUsers[$i]][0]."\" value=\"".$users[$selectedUsers[$i]][1]."\"/>"; } $chartContent .= "<styles>" . "<definition>" . "<style type=\"font\" name=\"CaptionFont\" size=\"16\" color=\"666666\"/>" . "<style type=\"font\" name=\"SubCaptionFont\" bold=\"0\"/>" . "</definition>" . "<application>" . "<apply toObject=\"caption\" styles=\"CaptionFont\"/>" . "<apply toObject=\"SubCaption\" styles=\"SubCaptionFont\"/>" . "</application>" . "</styles>" . "</chart>"; $file_handle = fopen('ChartData.xml','w'); fwrite($file_handle,$chartContent); fclose($file_handle); } initialize("root","","hiddenpeak"); ?>

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  • SQL CHECK constraint issues

    - by blahblah
    I'm using SQL Server 2008 and I have a table with three columns: Length, StartTime and EndTime. I want to make a CHECK constraint on this table which says that: if Length == NULL then StartTime <> NULL and EndTime <> NULL else StartTime == NULL and EndTime == NULL I've begun to try things like this: Length == NULL AND StartTime <> NULL AND EndTime <> NULL Obviously this is not enough, but even this simple expression will not validate. I get the error: "Error validating 'CK_Test_Length_Or_Time'. Do you want to edit the constraint?" Any ideas on how to go about doing this?

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  • Identity column SQL Server 2005 inserting same value twice

    - by DannykPowell
    I have a stored procedure that inserts into a table (where there is an identity column that is not the primary key- the PK is inserted initially using the date/time to generate a unique value). We then use SCOPEIDENTITY() to get the value inserted, then there is some logic to generate the primary key field value based on this value, which is then updated back to the table. In some situations the stored procedure is called simultaneously by more than one process, resulting in "Violation of PRIMARY KEY constraint..." errors. This would seem to indicate that the identity column is allowing the same number to be inserted for more than one record. First question- how is this possible? Second question- how to stop it...there's no error handling currently so I'm going to add some try/ catch logic- but would like to understand the problem fully to deal with properly

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  • Show/Hide button (text) for Accordion

    - by Kevin
    Have an accordion with a "view" button to open close the accordion panel (using jQuery Tools), but I would like to have dynamic text that says "show/hide" depending on the state... Here is the code for the accordion in asp.NET <div id="accordion"> <% foreach (var eventModel in ViewModel) { %> <% var isNewMonth = eventModel.Date.Month != previousMonth; %> <% if (isNewMonth && previousMonth > 0) { %></table></div><% } %> <% previousMonth = eventModel.Date.Month; %> <% if (isNewMonth) { %> <h2><%= string.Concat(eventModel.Date.ToString("MMMM"), " ", eventModel.Date.Year) %> <span style="float:right;"><a href="#" class="button blue small">View</a></span></h2> <div class="pane" style="display:block"> <table id="listTable" width="100%" cellpadding="3" cellspacing="0" border="0"> <tr align="left" valign="top"><th align="left" valign="top">Date</th><th align="left" valign="top">Event</th><th align="left" valign="top">Event Type</th></tr> <% } %> <tr align="left" valign="top"><td align="left" valign="top"><b><span id="date" style="float:left;"> <%= string.Concat(eventModel.Date.ToString("MMMM"), " ", eventModel.Date.Day, " </span><span id='day' style='float:left'>" + eventModel.Date.DayOfWeek + "</span> ")%></b></td><td align="left" valign="top" ><%= Html.ActionLink(eventModel.Name.Truncate(40), "event", "register", new { id = eventModel.Id }, null)%></td><td align="left" valign="top"><%= string.Concat(" ", eventModel.Sport)%></td></tr> <% } %> <% if (ViewModel.Count > 0) { %></table></div><% } %> </div> Here is the initialization script using jQuery: $(function() { $("#accordion").tabs("#accordion div.pane", {tabs: 'h2', effect: 'slide', initialIndex: 0}); $(".small").click(function() { moveToTop(); }); });

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  • PostgreSQL - disabling constraints

    - by azp74
    I have a table with approx 5 million rows which has a fk constraint referencing the primary key of another table (also approx 5 million rows). I need to delete about 75000 rows from both tables. I know that if I try doing this with the fk constraint enabled it's going to take an unacceptable amount of time. Coming from an Oracle background my first thought was to disable the constraint, do the delete & then reenable the constraint. PostGres appears to let me disable constraint triggers if I am a super user (I'm not, but I am logging in as the user that owns/created the objects) but that doesn't seem to be quite what I want. The other option is to drop the constraint and then reinstate it. I'm worried that rebuilding the constraint is going to take ages given the size of my tables. Any thoughts?

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  • Ajax AsyncFileUpload contains Filename Every time

    - by Kartik Patel
    I have used the Ajax AsyncFileUpload.I have three field. 1.Name 2.Asynchronous File Upload 3.Description 4.Save buttton when I click on Save new Record created.after creating new record when i enter all above details except select the Asynchronous File Upload.However when i click on Save button the Asynchronous File Upload contains the before Asynchronous upload File Name inspite of i didnt select the File from File Upload...How its possible getting confused.. My code is like this i have used master page. <asp:Content ID="Content2" ContentPlaceHolderID="body" runat="server"> <script type="text/javascript" language="javascript"> function UploadComplete() { document.getElementById('<%=lblmsg.ClientID %>').innerHTML = "Image Uploaded Successfully."; } function UploadError() { document.getElementById('<%=lblmsg.ClientID %>').innerHTML = "Image Upload Failed."; } </script> <table> <tr> <td colspan="2"> <h1 style="color: #008000"> Add Project Details</h1> </td> </tr> <tr> <td align="left"> <asp:Label ID="lblProjectName" runat="server" Text="Project Name" Font-Bold="true"></asp:Label> </td> <td align="left"> <asp:TextBox ID="txtProjectName" runat="server" MaxLength="50" Width="150px" ValidationGroup="Save"></asp:TextBox> <asp:RequiredFieldValidator ID="rfvprojectname" runat="server" Text="Project Name is Required." ErrorMessage="Project Name is Required." ControlToValidate="txtProjectName" ForeColor="Red" ValidationGroup="Save"></asp:RequiredFieldValidator> </td> </tr> <tr> <td colspan="2"> </td> </tr> <tr> <td align="left"> <asp:Label ID="lblselectimage" runat="server" Text="Select Image" Font-Bold="true"></asp:Label> </td> <td align="left"> <table> <tr> <td> <cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"> </cc1:ToolkitScriptManager> <cc1:AsyncFileUpload ID="AsyncFileUpload1" runat="server" OnClientUploadComplete="UploadComplete" OnClientUploadError="UploadError" CompleteBackColor="White" Width="350px" UploaderStyle="Traditional" UploadingBackColor="#CCFFFF" ThrobberID="imgLoad" OnUploadedComplete="fileuploadComplete" ClientIDMode="AutoID" EnableViewState="true"/> </td> <td> <asp:Image ID="imgUpload" runat="server" Width="50px" Height="50px" /> </td> </tr> </table> </td> </tr> <tr> <td> </td> <td> <asp:Image ID="imgLoad" runat="server" ImageUrl="~/Images/loading-gif-animation.gif" Width="50px" Height="50px" /> <asp:Label ID="lblmsg" runat="server" ForeColor="Blue" Font-Bold="true"></asp:Label> </td> </tr> <tr> <td align="left"> <asp:Label ID="lblDescription" runat="server" Text="Description" Font-Bold="true"></asp:Label> </td> <td align="left"> <asp:TextBox ID="txtDescription" runat="server" MaxLength="1000" Width="300" TextMode="MultiLine" ValidationGroup="Save" Height="100px"></asp:TextBox> <asp:RequiredFieldValidator ID="RfvtxtDescription" runat="server" Text="Project Description is Required." ErrorMessage="Project Description is Required." ControlToValidate="txtDescription" ForeColor="Red" ValidationGroup="Save"></asp:RequiredFieldValidator> </td> </tr> <tr> <td> </td> <td align="left"> <asp:ImageButton ID="btnsave" runat="server" ImageUrl="~/Images/Save.jpg" OnClick="btnSave_Click" Height="37px" ValidationGroup="Save" /> </td> </tr> </table>

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  • Execution Plan Optimization when where clause is removed then added back

    - by nmushov
    I have a stored procedure that uses a table valued function which executes in 9 seconds. If I alter the table valued function and remove the where clause, the stored procedure executes in 3 seconds. If I add the where clause back, the query still executes in 3 seconds. I took a look at the execution plans and it appears that after I remove the where clause, the execution plan includes parallelism and the scan count for 2 of my tables drops for 50000 and 65000 down to 5 and 3. After I add the where clause back, the optimized execution plan still runs unless I run DBCC FREEPROCCACHE. Questions 1. Why would SQL Server start using the optimized execution plan for both queries only when I first remove the where clause? Is there a way to force SQL Server to use this execution plan? Also, this is a paramaterized all-in-one query that uses the (Parameter is null or Parameter) in the where clause, which I believe is bad for performance. RETURNS TABLE AS RETURN ( SELECT TOP (@PageNumber * @PageSize) CASE WHEN @SortOrder = 'Expensive' THEN ROW_NUMBER() OVER (ORDER BY SellingPrice DESC) WHEN @SortOrder = 'Inexpensive' THEN ROW_NUMBER() OVER (ORDER BY SellingPrice ASC) WHEN @SortOrder = 'LowMiles' THEN ROW_NUMBER() OVER (ORDER BY Mileage ASC) WHEN @SortOrder = 'HighMiles' THEN ROW_NUMBER() OVER (ORDER BY Mileage DESC) WHEN @SortOrder = 'Closest' THEN ROW_NUMBER() OVER (ORDER BY P1.Distance ASC) WHEN @SortOrder = 'Newest' THEN ROW_NUMBER() OVER (ORDER BY [Year] DESC) WHEN @SortOrder = 'Oldest' THEN ROW_NUMBER() OVER (ORDER BY [Year] ASC) ELSE ROW_NUMBER() OVER (ORDER BY InventoryID ASC) END as rn, P1.InventoryID, P1.SellingPrice, P1.Distance, P1.Mileage, Count(*) OVER () RESULT_COUNT, dimCarStatus.[year] FROM (SELECT InventoryID, SellingPrice, Zip.Distance, Mileage, ColorKey, CarStatusKey, CarKey FROM facInventory JOIN @ZipCodes Zip ON Zip.DealerKey = facInventory.DealerKey) as P1 JOIN dimColor ON dimColor.ColorKey = P1.ColorKey JOIN dimCarStatus ON dimCarStatus.CarStatusKey = P1.CarStatusKey JOIN dimCar ON dimCar.CarKey = P1.CarKey WHERE (@ExteriorColor is NULL OR dimColor.ExteriorColor like @ExteriorColor) AND (@InteriorColor is NULL OR dimColor.InteriorColor like @InteriorColor) AND (@Condition is NULL OR dimCarStatus.Condition like @Condition) AND (@Year is NULL OR dimCarStatus.[Year] like @Year) AND (@Certified is NULL OR dimCarStatus.Certified like @Certified) AND (@Make is NULL OR dimCar.Make like @Make) AND (@ModelCategory is NULL OR dimCar.ModelCategory like @ModelCategory) AND (@Model is NULL OR dimCar.Model like @Model) AND (@Trim is NULL OR dimCar.Trim like @Trim) AND (@BodyType is NULL OR dimCar.BodyType like @BodyType) AND (@VehicleTypeCode is NULL OR dimCar.VehicleTypeCode like @VehicleTypeCode) AND (@MinPrice is NULL OR P1.SellingPrice >= @MinPrice) AND (@MaxPrice is NULL OR P1.SellingPrice < @MaxPrice) AND (@Mileage is NULL OR P1.Mileage < @Mileage) ORDER BY CASE WHEN @SortOrder = 'Expensive' THEN -SellingPrice WHEN @SortOrder = 'Inexpensive' THEN SellingPrice WHEN @SortOrder = 'LowMiles' THEN Mileage WHEN @SortOrder = 'HighMiles' THEN -Mileage WHEN @SortOrder = 'Closest' THEN P1.Distance WHEN @SortOrder = 'Newest' THEN -[YEAR] WHEN @SortOrder = 'Oldest' THEN [YEAR] ELSE InventoryID END )

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  • Rails. Putting update logic in your migrations

    - by Daniel Abrahamsson
    A couple of times I've been in the situation where I've wanted to refactor the design of some model and have ended up putting update logic in migrations. However, as far as I've understood, this is not good practice (especially since you are encouraged to use your schema file for deployment, and not your migrations). How do you deal with these kind of problems? To clearify what I mean, say I have a User model. Since I thought there would only be two kinds of users, namely a "normal" user and an administrator, I chose to use a simple boolean field telling whether the user was an adminstrator or not. However, after I while I figured I needed some third kind of user, perhaps a moderator or something similar. In this case I add a UserType model (and the corresponding migration), and a second migration for removing the "admin" flag from the user table. And here comes the problem. In the "add_user_type_to_users" migration I have to map the admin flag value to a user type. Additionally, in order to do this, the user types have to exist, meaning I can not use the seeds file, but rather create the user types in the migration (also considered bad practice). Here comes some fictional code representing the situation: class CreateUserTypes < ActiveRecord::Migration def self.up create_table :user_types do |t| t.string :name, :nil => false, :unique => true end #Create basic types (can not put in seed, because of future migration dependency) UserType.create!(:name => "BASIC") UserType.create!(:name => "MODERATOR") UserType.create!(:name => "ADMINISTRATOR") end def self.down drop_table :user_types end end class AddTypeIdToUsers < ActiveRecord::Migration def self.up add_column :users, :type_id, :integer #Determine type via the admin flag basic = UserType.find_by_name("BASIC") admin = UserType.find_by_name("ADMINISTRATOR") User.all.each {|u| u.update_attribute(:type_id, (u.admin?) ? admin.id : basic.id)} #Remove the admin flag remove_column :users, :admin #Add foreign key execute "alter table users add constraint fk_user_type_id foreign key (type_id) references user_types (id)" end def self.down #Re-add the admin flag add_column :users, :admin, :boolean, :default => false #Reset the admin flag (this is the problematic update code) admin = UserType.find_by_name("ADMINISTRATOR") execute "update users set admin=true where type_id=#{admin.id}" #Remove foreign key constraint execute "alter table users drop foreign key fk_user_type_id" #Drop the type_id column remove_column :users, :type_id end end As you can see there are two problematic parts. First the row creation part in the first model, which is necessary if I would like to run all migrations in a row, then the "update" part in the second migration that maps the "admin" column to the "type_id" column. Any advice?

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  • Force redraw as resizing NSTableColumn in NSTableView?

    - by Dov
    I've implemented - (CGFloat)tableView:(NSTableView *)tableView heightOfRow:(NSInteger)row in my NSTableView's delegate to resize the height of my table's rows as the width of the leftmost column changes. The problem is that only that column redraws during the resizing (and any column that slide into view during the resize). This results in the funky visual below after resizing. What I'd like is a way to tell the table view to completely redraw while the user is resizing a column. Right now the most I've been able to figure out is calling setNeedsDisplay after it that column finishes resizing.

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  • MySQL is returning an "column ambiguous" error when it used to work before I upgraded...

    - by Ronedog
    I recently upgraded MySQL to 5.1.41. Before the upgrade the following SQL worked (or at least I thought I remembered it working...it has been a few weeks since designing this...). Now the SQL gives me an error stating that the "archived" column is ambiguous. How can I write this differently, or is there a different problem I'm not aware of? I simply want to return the "unit_id", "lease_count" (stored in another table with a unit_id that should correspond with the "a.unit_id"), and "lease_archived_count (stored in another table with a unit_id that should correspond with the "a.unit_id"). SELECT a.unit_id, (SELECT count(*) FROM o_leases WHERE unit_id = a.unit_id AND archived = 0) as lease_count, (SELECT count(*) FROM o_leases WHERE unit_id = a.unit_id AND archived = 1) as lease_archive_count FROM p_unit a, properties b, portfolio c WHERE a.property_id = b.properties_id AND b.portfolio_id = c.portfolio_id AND a.archived = 0 Thanks for your help.

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  • Daily/Weekly/Monthly Record Count Search via StoredProcedure

    - by user270960
    Using MS SQL Server.I have made a Stored Procedure naming "SP_Get_CallsLogged". I have a table named "TRN_Call", and it has one column named "CallTime" which is a DateTime. I have a web-page in my application where the User enters:- 1.StartDate (DateTime) 2.EndDate (DateTime) 3.Period(Daily/Weekly/Monthly) (varchar) (from DropDownList) I want to get the Record Count of those calls in my table *TRN_Call* on the basis of the specified Period(Daily/Weekly/Monthly) selected by user in the DropDownList. e.g. StartDate ='1/18/2010 11:10:46 AM' EndDate ='1/25/2010 01:10:46 AM' Period =Daily So the record count between these above mentioned dates(StartDate+EndDate) should come in a manner so that I can refer to those counts separately i.e. the following:- Date 1/18/2010 Records Found 5 Date 1/19/2010 Records Found 50 Date 1/20/2010 Records Found 15 Date 1/21/2010 Records Found 32 Date 1/22/2010 Records Found 12 Date 1/23/2010 Records Found 15 Date 1/24/2010 Records Found 17 Date 1/25/2010 Records Found 32 and send those Counts to the Web Application so that these counts could be listed then in the Crystal Reports.

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  • PHP multiuser login class or script

    - by FFish
    I am looking for a simple but secure login script with mySQL PHP: sessions, MD5 that I can use with my exsisting database. Cookies to store password + password recovery by email. Change login/pass. I do not need registering, I register the user myself with temp login/pass. table agents agent1 agent2 table albums album1, owner: agent1 album2, owner: agent1 album3, owner: agent2 ... login.php agent1 logs in and has access to his albums: - album1 - album2 agent1 can edit his albums: edit.php?ref=album1 but NOT edit.php?ref=album3 by changing the ?ref variable

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  • In Oracle 10g, how do I see tables in schemes other than system

    - by Yasir Arsanukaev
    In the hr schema there's a table emloyees, I can query data from it specifying it implicitly SELECT count(*) FROM hr.employees while logged in as system, but when I navigate to Home-Object Browser in the browser I can't see the table employees and other tables in other schemas. Can I manage tables in schemas other than system while logged in as system? Maybe there's some setting which enables me to group tables by schema. My Oracle Database version is 10.2.0.1 Express Edition. IIRC I could see all tables in Oracle Database 10.1.x.y. Thanks.

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  • Complicated football league Dynamic Ordering in MySQL?

    - by Dan
    I have a table 'games' for a football league as follows: date home_team_id away_team_id home_score away_score - 1 2 6 21 - 3 1 7 19 I can't figure out how to dynamically generate a list of team ID's ordered by Wins (then points for if poss)? -- I have this query which works fine when I have a $team_id but of cause then I can only do 1 team at a time, and that doesn't allow for ordering at query level ((SELECT COUNT(*) FROM `games` WHERE ((`home_score` > `away_score`) AND `home_team_id` = '.$team_id.')) + (SELECT COUNT(*) FROM `games` WHERE ((`home_score` < `away_score`) AND `away_team_id` = '.$team_id.'))) AS `wins` I wonder if i can use this with some form of GROUP, or mySQL can know the $team_id itself? I've also tried some multiple JOINs with the 'team' table but they didn't work either. Thanks, Dan

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  • A column insert or update conflicts with a rule imposed by a previous CREATE RULE statement.

    - by Ronnie Chester Lynwood
    hello. im working on a online game. i got some problems with inserting new data to table. im getting 2010-4-8 2:14, *** 37000, 513, [Microsoft][ODBC SQL Server Driver][SQL Server]A column insert or update conflicts with a rule imposed by a previous CREATE RULE statement. The statement was terminated. The conflict occurred in database 'KN_online', table 'ACCOUNT_CHAR', column 'strAccountID'., 261 NationSelect*** this error in logs. what does this means? how can i fix this? i've tried to delete RULE for my DB but I'm unable to delete RULE. im getting the rule 'dbo.unallowedchars' cannot be dropped because it is bounded to one or more clumn. I set all permissions right but its still not working.. thanks..

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  • How to correctly calculate address spaces?

    - by user337308
    Below is an example of a question given on my last test in a Computer Engineering course. Anyone mind explaining to me how to get the start/end addresses of each? I have listed the correct answers at the bottom... The MSP430F2410 device has an address space of 64 KB (the basic MSP430 architecture). Fill in the table below if we know the following. The first 16 bytes of the address space (starting at the address 0x0000) is reserved for special function registers (IE1, IE2, IFG1, IFG2, etc.), the next 240 bytes is reserved for 8-bit peripheral devices, and the next 256 bytes is reserved for 16-bit peripheral devices. The RAM memory capacity is 2 Kbytes and it starts at the address 0x1100. At the top of the address space is 56KB of flash memory reserved for code and interrupt vector table. What Start Address End Address Special Function Registers (16 bytes) 0x0000 0x000F 8-bit peripheral devices (240 bytes) 0x0010 0x00FF 16-bit peripheral devices (256 bytes) 0x0100 0x01FF RAM memory (2 Kbytes) 0x1100 0x18FF Flash Memory (56 Kbytes) 0x2000 0xFFFF

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  • Php PEAR, Database Abstraction & Factory Methods

    - by pws5068
    I'm interested in learning more about design practices in PHP for Database Abstraction & Factory methods. For background, my site is a special-interest social networking community currently in beta mode. Currently, I've started moving my old code for object retrieval to factory methods. However, I do feel like I'm limiting myself by keeping a lot of SQL table names and structure separated in each function/method. Questions: 1.) Is there a reason to use PEAR (or similar) if I dont anticipate switching databases? 2.) Can PEAR interface with the MySqli prepared statements I currently use? 3.) Will it help me separate table names from each method? (If no, what other design patterns might I want to research?) 4.) Will it slow down my site once I have a significantly large member base?

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  • ideas for algorithm? sorting a list randomly with emphasis on variety

    - by Steve Eisner
    I have a table of items with [ID,ATTR1,ATTR2,ATTR3]. I'd like to select about half of the items, but try to get a random result set that is NOT clustered. In other words, there's a fairly even spread of ATTR1 values, ATTR2 values, and ATTR3 values. This does NOT necessarily represent the data as a whole, in other words, the total table may be generally concentrated on certain attribute values, but I'd like to select a subset with more variety. The attributes are not inter-related, so there's not really a correlation between ATTR1 and ATTR2. Any ideas for an efficient algorithm? Thanks! I don't really even know how to search for this :)

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  • How to find the Mac address of a 'shutdown' system on local lan (is it possible?)

    - by pirates-iiita
    hello everyone, Can anyone please tell the way to find out the mac address of a system which is: Shutdown Power plugged in Connected to Lan Nic card ON. Kindly post the solution as i urgently need it in my project... thank you Update I am asking how to find out the mac address of some other system which is already shutdown.... and which is on lan.. I want to find out its mac from my system.... and to be clear... i want to tell that.. arp table can be populated by using ping .. i.e. if 172.16.3.12 is not in arp table then it can be added by just ping 172.16.3.12 but a system can be pinged only if its on ... a shutdown system can't be pinged...

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