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• How to monitor MySQL query errors, timeouts and logon attempts?

  - by Abel

  While setting up a third party closed source CMS (Sitefinity) the setup doesn't create all tables and procedures necessary to run it. The software lacks a logging system itself and it made me wonder: could I trace and monitor failing SQL statements from MySQL? This serves more than only the purpose of solving my issue with Sitefinity. More often I wonder what's send to the MySQL server, not wanting to dive into the software products or setup a debugging environment etc. I tried JetProfiler (only performance) and looked through a few others, but although they monitor a lot, they don't monitor query failures, timeouts or logon attempts. Does anyone know a profiler, tracer, monitoring tool, commercial or free, that can show me this information?

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• Will this LINQ-TO-SQL query fetch all records from the table ?

  - by Puneet Dudeja

  public long GetNewCRN() { return ((from c in DataContext.GetTable<Cust_Master>() select c.CUSTSERH_CRN).Max() + 1); } Will this Linq to Sql query fetch all records from the table first and then select the maximum of the column ? If yes, then isn't it a bad idea using linq to sql instead of normal SqlCommand ? Or is there any other way of doing it in linq to sql ? When I attach Console.Out, I see nothing(command prompt does not even open). But when I include following:- context.Log = new System.IO.StreamWriter("d:\\abcd.txt"); I get an error, that "The process can not access the file because it is being used by another process" and that process is "w3wp.exe". How can I see the sql commands being executed by DataContext then ?

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• In MongoDB, how can I replicate this simple query using map/reduce in ruby?

  - by Matthew Rathbone

  Hi, So using the regular MongoDB library in Ruby I have the following query to find average filesize across a set of 5001 documents: avg = 0 total = collection.count() Rails.logger.info "#{total} asset creation stats in the system" collection.find().each {|row| avg += (row["filesize"] * (1/total.to_f)) if row["filesize"]} Its pretty simple, so I'm trying to do the same using map/reduce as a learning exercise. This is what I came up with: map = 'function(){emit("filesizes", {size: this.filesize, num: 1});}' reduce = 'function(k, vals){ var result = {size: 0, num: 0}; for(var x in vals) { var new_total = result.num + vals[x].num; result.num = new_total result.size = result.size + (vals[x].size * (vals[x].num / new_total)); } return result; }' @results = collection.map_reduce(map, reduce) However the two queries come back with two different results! What am I doing wrong?

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• How can I pass query string variables with NavigationService.Navigate?

  - by Mike Hildner

  Greetings, Searched for this, but no luck. I'm attempting to pass query string variables (and then retrieve them) in my Silverlight 4 app. First I tried this this.NavigationService.Navigate(new Uri("/LoanProductionRegion?Elvis=Alive&ImHungry=true", UriKind.Relative)); But HtmlPage.Document.QueryString doesn't pick them up because they come after the anchor (the full url looks like http://localhost:1076/Dashboard.SLTestPage.aspx#/LoanProductionRegion?Elvis=Alive&ImHungry=true). I tried to put the vars in front, such as this.NavigationService.Navigate(new Uri("?Elvis=Alive&ImHungry=true/LoanProductionRegion", UriKind.Relative)); this.NavigationService.Navigate(new Uri("/?Elvis=Alive&ImHungry=true/LoanProductionRegion", UriKind.Relative)); But both result in a "Page not found" error. Anyone know how to achieve what I'm after?

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• Dropdown in Access 2007 parameter query. Why not working

  - by waanders

  Hello, I want a Access parameter query to ask an user for a value (a location in this case). When I type [Enter location] in the Criteria field it works fine: I get a dialog box (Enter Parameter Value) with a textbox and my text (Enter Location). So far, so good. This works (the result also). But now I want a dropdown/combobox (instead of a textbox ) for the user to pick a location. I made a form and type Forms![Form1]![CmbLocation] in the Criteria field. Like this: http://office.microsoft.com/en-us/access/HA011170771033.aspx But I still get a textbox (with the reference as textlabel). What am I doing wrong? Has anybody any advice?

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• Get the last N rows in the database in order?

  - by Kristopher

  Let's say I have the following database table: record_id | record_date | record_value -----------+-------------+-------------- 1 | 2010-05-01 | 195.00 2 | 2010-07-01 | 185.00 3 | 2010-09-01 | 175.00 4 | 2010-05-01 | 189.00 5 | 2010-06-01 | 185.00 6 | 2010-07-01 | 180.00 7 | 2010-08-01 | 175.00 8 | 2010-09-01 | 170.00 9 | 2010-10-01 | 165.00 I want to grab the last 5 rows with the data ordered by record_date ASC. This is easy to do with: SELECT * FROM mytable ORDER BY record_date ASC LIMIT 5 OFFSET 4 Which would give me: record_id | record_date | record_value -----------+-------------+-------------- 6 | 2010-07-01 | 180.00 7 | 2010-08-01 | 175.00 3 | 2010-09-01 | 175.00 8 | 2010-09-01 | 170.00 9 | 2010-10-01 | 165.00 But how do I do this when I don't know how many records there are and can't compute the magic number of 4? I've tried this query, but if there are less than 5 records, it results in a negative OFFSET, which is invalid: SELECT * FROM mytable ORDER BY record_date ASC LIMIT 5 OFFSET (SELECT COUNT(*) FROM mytable) - 5; So how do I accomplish this?

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• How do I request a single random row from a force.com database in SOQL?

  - by Ollie C

  Total row-count is in the range 10k-100k rows. Can I use RAND() on force.com? Unfortunately although all the rows have a unique numeric identifier, there are many gaps, and I'd often want to select a random row from a filtered subset anyway. I suspect there's no particularly efficient way to do this, but is it possible at all? Ultimately all I want to do is to extract one row from a table (or a subset based on specific filter criteria) at random. If force.com doesn't let me select a random row, then can I query the rows to select from, and assign sequential IDs to all the rows, say 1-1,035, and then select a random number in that range locally, say 349, and then get row 349?

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• How can I pull data from a SQL Database that spans an academic year?

  - by Eric Reynolds

  Basically, I want to pull data from August to May for a given set of dates. Using the between operator works as long as I do not cross the year marker (i.e. BETWEEN 8 AND 12 works -- BETWEEN 8 AND 5 does not). Is there any way to pull this data? Here is the SQL Query I wrote: SELECT count(*), MONTH(DateTime) FROM Downloads WHERE YEAR(DateTime) BETWEEN 2009 AND 2010 AND MONTH(DateTime) BETWEEN 8 AND 5 GROUP BY MONTH(DateTime) ORDER BY MONTH(DateTime)" Any help is appreciated. Thanks, Eric R.

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• Zip Code to City/State and vice-versa in a database?

  - by Simucal

  I'm new to SQL and relational databases and I have what I would imagine is a common problem. I'm making a website and when each user submits a post they have to provide a location in either a zip code or a City/State. What is the best practice for handling this? Do I simply create a Zip Code and City and State table and query against them or are there ready made solutions for handling this? I'm using SQL Server 2005 if it makes a difference. I need to be able to retrieve a zip code given a city/state or I need to be able to spit out the city state given a zip code.

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• Query takes time on comparing non numeric data of two tables, how to optimize it?

  - by Muhammad Kashif Nadeem

  I have two DBs. The 1st db has CallsRecords table and 2nd db has Contacts table, both are on SQL Server 2005. Below is the sample of two tables. Contact table has 1,50,000 records CallsRecords has 75,000 records Indexes on CallsRecords: CallFrom CallTo PickUP Indexes on Contacts: PhoneNumber I am using this query to find matches but it take more than 7 minutes. SELECT * FROM CallsRecords r INNER JOIN Contact c ON r.CallFrom = c.PhoneNumber OR r.CallTo = c.PhoneNumber OR r.PickUp = c.PhoneNumber In Estimated execution plan inner join cost 95% Any help to optimize it.

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• how to add column in SQL Query that incl. LEFT OUTER JOIN

  - by radbyx

  I have this Query: SELECT p.ProductName, dt.MaxTimeStamp, p.Responsible FROM Product p LEFT JOIN (SELECT ProductID, MAX(TimeStamp) AS MaxTimeStamp FROM StateLog WHERE State = 0 GROUP BY ProductID, Status) dt ON p.ProductID = dt.ProductID ORDER BY p.ProductName; It works like it should, but now I need to SELECT "State" out too. The tricky part is, that I only want the lastest "TimeStamp" where "State" was false. But now I also need the "State" for the lastest "TimeStamp". I tried this: SELECT p.ProductName, dt.State, dt.MaxTimeStamp, p.Responsible FROM Product p LEFT JOIN (SELECT ProductID, MAX(TimeStamp) AS MaxTimeStamp, State FROM StateLog WHERE State = 0 GROUP BY ProductID, Status) dt ON p.ProductID =dt.ProductID ORDER BY p.ProductName; But it didn't work, because it gave me the "State" for the lastest "TimeStamp". So I hope there is some clever heads out there that can help me. I'm guessing that this is either very simple or very hard to solve.

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• Can I use a MySQL PREPARE statement in a function to create a query with a variable table name

  - by aHunter

  I want to create a function that has a select query inside that can be used against multiple database tables but I can not use a variable as the table name. Can I get around this using a PREPARE statement in the function? An Example: FUNCTION `TESTFUNC`(dbTable VARCHAR(25)) RETURNS bigint(20) BEGIN DECLARE datereg DATETIME; DECLARE stmt VARCHAR(255); SET stmt := concat( 'SELECT dateT FROM', dbTable, 'ORDER BY dateT DESC LIMIT 1'); PREPARE stmt FROM @stmt; EXECUTE stmt; RETURN dateT; END $$ Thanks in advance for any input.

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• Is there a way to query if array field contains a certain value in Doctrine2?

  - by dpimka

  Starting out with Symfony2 + Doctrine. I have a table with User objects (fos_user), for which my schema contains a roles column of an 'array' type. Doctrine saves fields of this type by serializing them from php 'array' to 'longtext' (in mysql's case). So let's say I have the following users saved into DB: **User1**: array(ROLE_ADMIN, ROLE_CUSTOM1) **User2**: array(ROLE_ADMIN, ROLE_CUSTOM2) **User3**: array(ROLE_CUSTOM2) Now in my controller I want to select all users with ROLE_ADMIN set. Is there a way to write a DQL query which would directly return me User1 and User2? Or do I need to fetch all users to have Doctrine to unserialize roles column and then for each of them do in_array('ROLE_ADMIN', $user-getRoles())? I have searched the DQL part of the manual, but so far did not find anything similar to my needs...

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• Ruby w/ Postgres & Sinatra - Query won't order right with parameter??

  - by alleywayjack

  So I set a variable in my main ruby file that's handling all my post and get requests and then use ERB templates to actually show the pages. I pass the database handler itself into the erb templates, and then run a query in the template to get all (for this example) grants. In my main ruby file: grants_main_order = "id_num" get '/grants' do erb :grants, :locals => {:db=>db, :order=>grants_main_order, :message=>params[:message]} end In the erb template: db = locals[:db] getGrants = db.exec("SELECT * FROM grants ORDER BY $1", [locals[:order]]) This produces some very random ordering, however if I replace the $1 with id_num, it works as it should. Is this a typing issue? How can I fix this? Using string replacement with #{locals[:order]} also gives funky results.

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• Multiple Scripts With the Same MySQL Query Running At Once => Will There Be Interference?

  - by walden

  I want to have multiple scripts running from cron at the same time. They will all update, say, 500 rows with a unique status ID for that particular script to use. If each script grabs the same type of rows to update, and the scripts run at once, will there be interference between the queries run at the same time? For example, using this query: UPDATE table SET status = <unique script ID> WHERE status = 0 LIMIT 500 Will I get the same rows updating more than once? I'm trying to get each script to get unique rows. I was thinking of using sleep() to make the queries run at different times, but I'm not sure if that's necessary. Thanks.

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• How to programmatically fetch posts matching a search query in WordPress?

  - by Alan Bellows

  In my plugin code I would like to perform a WP_Query (or similar) which returns all posts matching a given query string, as if the user typed that same string into the WordPress search form. Perhaps I'm just being dense, but I cannot seem to find a way to do so. I would expect to have a special parameter for WP_Query, such as matching, but I see no evidence of one. I'll start going through the WordPress codebase to see how it's done internally, and I'll post the answer here if I find it. I just thought someone might happen to know offhand.

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• How do I pass a Yahoo Pipes item into a YQL query?

  - by Joe Shaw

  One common thing to want to do in the Yahoo Pipes YQL element is pass in a Pipes value to the YQL query. For example: select * from html.tostring where url='<someurl>' and xpath='//div[@id="foo"]' and you want to pass in a dynamic value for <someurl>. Let's say that it's an RSS feed item's URL called item.link. Attempting to simply replace the quoted someurl with item.link gives you this error: Invalid identifier item.link. me is the only supported identifier in this context How can I pass this value in?

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• Can I use a single MySQL query to select distinct rows and then non-distinct rows if a limit hasn't

  - by Matt Rix

  I hope I'm explaining this properly, my knowledge of MySQL is quite limited. Let's say I have a table with rows that have name and shape fields. I'd like to select a bunch of rows from a table, but return all of the rows with unique shape field values first. If I have less than a certain number of rows, let's say 7, then I'd like to fill the remaining result rows with non-unique shape rows. The best way I can word it is that they're "ordered by uniqueness, and then by some other value". So, I don't want: square, square, circle, circle, rectangle, square, triangle I'd like to have: square, circle, rectangle, triangle, square, square, circle Is this possible to do using a single SQL query? I'm using MySQL with PHP, if that makes any difference. Thanks!

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• Where do I put the Current user query so as to not repeat per controller?

  - by Kevin

  I have a standard query that gets the current user object: @user = User.find_by_email(session[:email]) but I'm putting it as the first line in every single controller action which is obviously not the best way to do this. What is the best way to refactor this? Do I put this as a method in the Application controller (and if so, can you just show me a quick example)? Do I put the entire @user object into the session (has about 50 columns and some sensitive ones like is_admin)? Or is there another way to remove this kind of redundancy?

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• Why are awkward numbers and letters in my query string??

  - by Nicole

  Hi everyone!! I have a MVC website and when I execute it, the query string (url) that appears is: http://localhost:6970/(S(51aegi45qneolxa0oxwuzh55))/default.aspx what the hell is that strange combination of numbers and letters??? please help!!!!! previously i had been working with the session expires to redirect to one of my views, could be something of that?? i have added the following action filter: public override void OnActionExecuting(ActionExecutingContext filterContext) { HttpContextBase ctx = filterContext.HttpContext; // check if session is supported if (ctx.Session != null) { // check if a new session id was generated if (ctx.Session.IsNewSession) { // If it says it is a new session, but an existing cookie exists, then it must // have timed out string sessionCookie = ctx.Request.Headers["Cookie"]; if ((null != sessionCookie) && (sessionCookie.IndexOf("ASP.NET_SessionId") >= 0)) { filterContext.HttpContext.Response.Redirect("~/Error/SesionExpirada", true); } } } base.OnActionExecuting(filterContext); } but if I put it in ignore it stills add that rare thing to my urls. Please help!!! thanks

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• Having trouble comparing a range of dates entered in a form with records in a mySQL database

  - by Andrew Fox

  I have a table called schedule and a column called Date where the column type is date. In that column I have a range of dates, which is currently from 2012-11-01 to 2012-11-30. I have a small form where the user can enter a range of dates (input names from and to) and I want to be able to compare the range of dates with the dates currently in the database. This is what I have: //////////////////////////////////////////////////////// //////First set the date range that we want to use////// //////////////////////////////////////////////////////// if(isset($_POST['from']) && ($_POST['from'] != NULL)) { $startDate = $_POST['from']; } else { //Default date is Today $startDate = date("Y-m-d"); } if(isset($_POST['to']) && ($_POST['to'] != NULL)) { $endDate = $_POST['to']; } else { //Default day is one month from today $endDate = date("Y-m-d", strtotime("+1 month")); } ////////////////////////////////////////////////////////////////////////////////////// //////Next calculate the total amount of days selected above to use as a limiter////// ////////////////////////////////////////////////////////////////////////////////////// $dayStart = strtotime($startDate); $dayEnd = strtotime($endDate); $total_days = abs($dayEnd - $dayStart) / 86400 +1; echo "Start Date: " . $startDate . "<br>End Date: " . $endDate . "<br>"; echo "Day Start: " . $dayStart . "<br>Day End: " . $dayEnd . "<br>"; echo "Total Days: " . $total_days . "<br>"; //////////////////////////////////////////////////////////////////////////////////// //////Then we're going to see if the dates selected are in the schedule table////// //////////////////////////////////////////////////////////////////////////////////// //Select all of the dates currently in the schedule table between the range selected. $sql = ("SELECT Date FROM schedule WHERE Date BETWEEN '$startDate' AND '$endDate' LIMIT $total_days"); //Run a check on the query to make sure it worked. If it failed then print the error. if(!$result_date_query = $mysqli->query($sql)) { die('There was an error getting the dates from the schedule table [' . $mysqli->error . ']'); } //Set the dates to an array for future use. // $current_dates = $result_date_query->fetch_assoc(); //Loop through the results while a result is being returned. while($row = $result_date_query->fetch_assoc()) { echo "Row: " . $row['Date'] . "<br>"; echo "Start day: " . date('Y-m-d', $dayStart) . "<br>"; //Set this loop to add 1 day to the Start Date until it reaches the End Date for($i = $dayStart; $i <= $dayEnd; $i = strtotime('+1 day', $i)) { $date = date('Y-m-d',$i); echo "Loop Start day: " . date('Y-m-d', $dayStart) . "<br>"; //Run a check to see if any of the dates selected are in the schedule table. if($row['Date'] != $date) { echo "Current Date: " . $row['Date'] . "<br>"; echo "Date: " . $date . "<br>"; echo "It appears as though you've selected some dates that are not in the schedule database.<br>Please correct the issue and try again."; return; } } } //Free the result so something else can use it. $result_date_query->free(); As you can see I've added in some echo statements so I can see what is being produced. From what I can see it looks like my $row['Date'] is not incrementing and staying at the same date. I originally had it set to a variable (currently commented out) but I thought that could be causing problems. I have created the table with dates ranging from 2012-11-01 to 2012-11-15 for testing and entered all of this php code onto phpfiddle.org but I can't get the username provided to connect. Here is the link: PHP Fiddle I'll be reading through the documentation to try and figure out the user connection problem in the meantime, I would really appreciate any direction or advice you can give me.

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• Does having a longer string in a SQL Like expression allow hinder or help query executing speed?

  - by Allain Lalonde

  I have a db query that'll cause a full table scan using a like clause and came upon a question I was curious about... Which of the following should run faster in Mysql or would they both run at the same speed? Benchmarking might answer it in my case, but I'd like to know the why of the answer. The column being filtered contains a couple thousand characters if that's important. SELECT * FROM users WHERE data LIKE '%=12345%' or SELECT * FROM users WHERE data LIKE '%proileId=12345%' I can come up for reasons why each of these might out perform the other, but I'm curious to know the logic.

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• How can I delete ghost database field between a special date?

  - by Chiyou

  I have a mysql table with many user input and I want to delete ghost e-mail between a special date. I use this query and it seems to work very good: DELETE u1 From tx_table u1 JOIN tx_table u2 USING (email) WHERE u1.tstamp < u2.tstamp but I want to delete between a longer time. When I add 300 it seems to delete everything in my table: DELETE u1 From tx_table u1 JOIN tx_table u2 USING (email) WHERE u1.tstamp < u2.tstamp+300. How can I add 5 minutes to the tstamp with SQL?

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• Tag filtering Query using T-SQL and Linq-to-SQL?

  - by EdenMachine

  I'm trying to figure out how to allow a user to enter in a string of tags (keywords separated by spaces) in a textbox to filter a grid of results. Here are the tables: PACKETS *PacketID Name PACKETTAGS *PacketTagID PacketID TagID Tags *TagID Name Here is the basic query without the WHERE parameters: SELECT Packets.Name, Tags.Name AS Tag, PacketTags.PacketTagID FROM Packets INNER JOIN PacketTags ON Packets.PacketID = PacketTags.PacketID INNER JOIN Tags ON PacketTags.TagID = Tags.TagID I need to filter out all the Packets that don't have tags that match any of the words BUT ALSO ONLY include the Packets that have the tags entered in the string of text (spaces separate the tags when entered into the textbox) I'm starting with the basics by figuring this out in t-SQL first but ultimately I need to be able to do this in Linq-to-SQL

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• Can I force MySQL to output results before query is completed?

  - by Gordon Royle

  I have a large MySQL table (about 750 million rows) and I just want to extract a couple of columns. SELECT id, delid FROM tbl_name; No joins or selection criteria or anything. There is an index on both fields (separately). In principle, it could just start reading the table and spitting out the values immediately, but in practice the whole system just chews up memory and basically grinds to a halt. It seems like the entire query is being executed and the output stored somewhere before ANY output is produced... I've searched on unbuffering, turning off caches etc, but just cannot find the answer. (mysqldump is almost what I want except it dumps the whole table - but at least it just starts producing output immediately)

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