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• How do you make long SQL invoked from other code readable?

  - by Artem

  This is a very open question, but I think it can be very beneficial for SQL readability. So you have a Java program, and you are trying to call a monster SQL statement from it, with many subqueries and joins. The starting point for my question is a string constant like this: static string MONSTER_STATEMENT = "SELECT " + " fields" + "WHERE "+ " fieldA = (SELECT a FROM TableC) " + "AND fieldB IN (%s)" + "AND fieldC = %d " + "FROM " " tableA INNER JOIN tableB ON ..."; It later gets filled using String.format and executed. What are you tricks for making this kind of stuff readable? Do you separate your inner joins. Do you indent the SQL itself inside the string? Where do you put the comments? Please share all of the tricks in your arsenal.

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• In Python, is it better to use list comprehensions or for-each loops?

  - by froadie

  Which of the following is better to use and why? Method 1: for k, v in os.environ.items() print "%s=%s" % (k, v) Method 2: print "\n".join(["%s=%s" % (k, v) for k,v in os.environ.items()]) I tend to lead towards the first as more understandable, but that might just be because I'm new to Python and list comprehensions are still somewhat foreign to me. Is the second way considered more Pythonic? I'm assuming there's no performance difference, but I may be wrong. What would be the advantages and disadvantages of these 2 techniques? (Code taken from Dive into Python)

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• INSERT INTO ... SELECT ... vs dumping/loading a file in MySQL

  - by Daniel Huckstep

  What are the implications of using a INSERT INTO foo ... SELECT FROM bar JOIN baz ... style insert statement versus using the same SELECT statement to dump (bar, baz) to a file, and then insert into foo by loading the file? In my messing around, I haven't seen a huge difference. I would assume the former would use more memory, but the machine that this runs on has 8GB of RAM, and I never even see it go past half used. Are there any huge (or long term) performance implications that I'm not seeing? Advantages/disadvantages of either?

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• You can't specify target table 'b' for update in FROM clause

  - by elo

  I need to know where did i do wrong in this sql statement. I try to find solution in previous threads with similar problem but none can solve my problem. so i think maybe my statement is actually wrong. update table1 b left join table2 m on b.ICNO=m.ICNO set b.SalMoveMth = '01' where m.Status!='6' and (DATE_FORMAT(startDateSand,'%m')='10' or DATE_FORMAT(startDateSand,'%m')='11' or DATE_FORMAT(startDateSand,'%m')='12') and ((select SalMoveMth from table1 where ICNO=table2.ICNO order by SalMoveMthStDt desc limit 1)!='10'). Thank You.

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• C++ and virtual methods overriding

  - by silent

  Sorry for this stupid question, but I can't find an answer by myself, I'm too new in C++ :( class DBObject : public QObject { ... protected: virtual QString tableName() { return ""; }; }; class DBUserObject : public DBObject { ... protected: virtual QString tableName() { return "profiles"; }; }; And I have this code in parent: bool DBObject::load(quint32 id) { QString query = QString("select %1 from %2 where id = :id") .arg(fieldList().join(",")) .arg(tableName()); <--- here is trouble ... } So I'm trying to execute: DBUserObject user; user.load(3); But in result I have a query with empty table name cause tableName() method returns empty string. Why not "profiles"?

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• The member [class] has no supported translation to SQL

  - by Code Sherpa

  Hi, I am getting the following error: Error Message:The member 'Company.ProductCore.Core.Domain.Account.Email' has no supported translation to SQL. My method looks like this: public Account GetAccountByEmail(string email) { Account account; using (WorkbookDataContext dc = _conn.GetContext()) { account = ( from a in dc.Accounts join em in dc.Emails on a.AccountId equals em.AccountId where a.Email.EmailAddress == email select a).FirstOrDefault(); } return account; } My Account class has a getter / setter that exposes Email: public Email Email { get { return _email; } set { _email = value; } } And my Email is a LINQ object. I have a feeling that the problem is that I am using a LINQ object for me Email property? I am new to LINQ and am not really sure why this is happening. Help appreciated, thanks...

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• SQL: How to use a column that was just added

  - by sbenderli

  I am trying to add 2 columns and then I would like to set some values to them but I get a compile-error saying the column does not exist. I am using the following script: IF NOT EXISTS (select column_name from INFORMATION_SCHEMA.columns where table_name = 'SYSTM_FRM' and column_name = 'SF_Ip_TXT') ALTER TABLE SYSTM_FRM add SF_Ip_TXT NVARCHAR(20) IF NOT EXISTS (select column_name from INFORMATION_SCHEMA.columns where table_name = 'SYSTM_FRM' and column_name = 'SF_Port_NUM') ALTER TABLE SYSTM_FRM add SF_Port_NUM int Update dbo.SYSTM_FRM SET dbo.SYSTM_FRM.SF_Ip_TXT = dbo.FRM.FRM_Ip_TXT, dbo.SYSTM_FRM.SF_Port_NUM = dbo.FRM.FRM_Port_NUM FROM dbo.FRM INNER JOIN dbo.SYSTM_FRM ON dbo.FRM.FRM_RCRD_NUM = dbo.SYSTM_FRM.SF_FrameRecord_NUM Is there any way to use a column that I am adding in the same script?

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• Object for storing strings in Python

  - by evg

  class MyWriter: def __init__(self, stdout): self.stdout = stdout self.dumps = [] def write(self, text): self.stdout.write(smart_unicode(text).encode('cp1251')) self.dumps.append(text) def close(self): self.stdout.close() writer = MyWriter(sys.stdout) save = sys.stdout sys.stdout = writer I use self.dumps list to store data obtained from prints. Is there a more convenient object for storing string lines in memory? Ideally I want dump it to one big string. I can get it like this "\n".join(self.dumps) from code above. May be it's better to just concatenate strings - self.dumps += text?

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• Waiting for a submitted job to finish in Oracle PL/SQL?

  - by vicjugador

  I'm looking for the equivalent of Java's thread.join() in PL/SQL. I.e. I want to kick off a number of jobs (threads), and then wait for them to finish. How is this possible in PL/SQL? I'm thinking of using dbms_job.submit (I know it's deprecated). dbms_scheduler is also an alternative. My code: DECLARE jobno1 number; jobno2 number; BEGIN dbms_job.submit(jobno1,'begin dbms_lock.sleep(10); dbms_output.put_line(''job 1 exit'');end;'); dbms_job.submit(jobno2,'begin dbms_lock.sleep(10); dbms_output.put_line(''job 2 exit'');end;'); dbms_job.run(jobno1); dbms_job.run(jobno2); //Need code to Wait for jobno1 to finish //Need code to Wait for jobno2 to finish END;

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• php and SQL_CALC_FOUND_ROWS

  - by Lizard

  I am trying to add the SQL_CALC_FOUND_ROWS into a query (Please note this isn't for pagination) please note I am trying to add this to a cakePHP query the code I currently have is below: return $this->find('all', array( 'conditions' => $conditions, 'fields'=>array('SQL_CALC_FOUND_ROWS','Category.*','COUNT(`Entity`.`id`) as `entity_count`'), 'joins' => array('LEFT JOIN `entities` AS Entity ON `Entity`.`category_id` = `Category`.`id`'), 'group' => '`Category`.`id`', 'order' => $sort, 'limit'=>$params['limit'], 'offset'=>$params['start'], 'contain' => array('Domain' => array('fields' => array('title'))) )); Note the 'fields'=>array('SQL_CALC_FOUND_ROWS',' this obviously doesn't work as It tries to apply the SQL_CALC_FOUND_ROWS to the table e.g. SELECTCategory.SQL_CALC_FOUND_ROWS, Is there anyway of doing this? Any help would be greatly appreciated, thanks.

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• i need to do a view in sql that returns the latest invoice date for each company

  - by dave haughton

  hi, i have a company table that is dbo.companies and has companyId as a column. I also have an invoice table that is dbo.invoices with invoicecompanyId column (which is the same as the companyId on the other table) and it also has a column called invoicedate. What i am mtrying to achieve is a view of each companyid with the corresponding latest invoice date for all the companies i have. i have done the following but i dont know how to filter for the latest invoice, it returns all invoices from all companies and i need latest invoice for all companies SELECT TOP (100) PERCENT 'A' + SUBSTRING('000000', 1, 6 - LEN(CAST(dbo.companies.companyId AS varchar(10)))) + CAST(dbo.companies.companyId AS varchar(10)) AS Client_ID, dbo.invoices.invoiceDate AS S_Inv_Date FROM dbo.invoices INNER JOIN dbo.companies ON dbo.invoices.invoiceCompanyId = dbo.companies.companyId ORDER BY Client_ID can you help please ta

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• TCP Scanner Python MultiThreaded

  - by user1473508

  I'm trying to build a small tcp scanner for a netmask. The code is as follow: import socket,sys,re,struct from socket import * host = sys.argv[1] def RunScanner(host): s = socket(AF_INET, SOCK_STREAM) s.connect((host,80)) s.settimeout(0.1) String = "GET / HTTP/1.0" s.send(String) data = s.recv(1024) if data: print "host: %s have port 80 open"%(host) Slash = re.search("/", str(host)) if Slash : netR,_,Wholemask = host.partition('/') Wholemask = int(Wholemask) netR = struct.unpack("!L",inet_aton(netR))[0] for host in (inet_ntoa(struct.pack("!L", netR+n)) for n in range(0, 1<<32-Wholemask)): try: print "Doing host",host RunScanner(host) except: pass else: RunScanner(host) To launch : python script.py 10.50.23.0/24 The problem I'm having is that even with a ridiculous low settimeout value set, it takes ages to cover the 255 ip addresses since most of them are not assigned to a machine. How can i make a way faster scanner that wont get stuck if the port is close.MultiThreading ? Thanks !

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• Error occurs while using SPADE method in R

  - by Yuwon Lee

  I'm currently mining sequence patterns using SPADE algorithm in R. SPADE is included in "arulesSequence" package of R. I'm running R on my CentOS 6.3 64bit. For an exercise, I've tried an example presented in http://en.wikibooks.org/wiki/Data_Mining_Algorithms_In_R/Sequence_Mining/SPADE When I tried to do "cspade(x, parameter = list(support = 0.4), control = list(verbose = TRUE))" R says: parameter specification: support : 0.4 maxsize : 10 maxlen : 10 algorithmic control: bfstype : FALSE verbose : TRUE summary : FALSE preprocessing ... 1 partition(s), 0 MB [0.096s] mining transactions ... 0 MB [0.066s] reading sequences ...Error in asMethod(object) : 's' is not an integer vector When I try to run SPADE on my Window 7 32bit, it runs well without any error. Does anybody know why such errors occur?

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• SQL Modify question

  - by Jeff

  I need to replace a lot of values for a Table in SQL if the inactivity is greater then 30 days. I have UPDATE VERSION SET isActive = 0 WHERE customerNo = ( SELECT c.VersionNo FROM Activity b INNER JOIN VERSION c ON b.VersionNo = c.VersionNo WHERE (Months_between(sysdate, b.Activitye) > 30) ); It only works for one value though, if there is more then one returned it fails. What am I missing here? If someone could educate me on what is going on, I'd also appreciate it.

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• [Python] Help me : how i can deal with web page !

  - by Str1k3r

  hello every one... am looking for modules or functions let's me joins in id web !!!! i mean like i told python go to hotmail.com then go to signup ! how i can do that i mean how i can tell python go to hotmail.com then find some thing called signup in source page then i tell him join to him ....etc i hope you understand my idea ! ** am thinking on urllib2 .. maybe it's can do that? am just new in python

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• How to map this class in NHibernate (not FluentNHibernate)?

  - by JMSA

  Suppose I have a database like this: This is set up to give role-wise menu permissions. Please note that, User-table has no direct relationship with Permission-table. Then how should I map this class against the database-tables? class User { public int ID { get; set; } public string Name { get; set; } public string Username { get; set; } public string Password { get; set; } public bool? IsActive { get; set; } public IList<Role> RoleItems { get; set; } public IList<Permission> PermissionItems { get; set; } public IList<string> MenuItemKeys { get; set; } } This means, (1) Every user has some Roles. (2) Every user has some Permissions (depending on to Roles). (3) Every user has some permitted MenuItemKeys (according to Permissions). How should my User.hbm.xml look like?

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• Problem removing a dynamic form field in jquery

  - by rshivers

  I'm trying to remove a dynamic form field by click a button. It will also subtract whatever values it had from the total amount from my calculation. This is the code: function removeFormField(id) { var id = $(id).attr("name"); $('#target1').text($("#total" + id).map(function() { var currentValue = parseFloat(document.getElementById("currentTotal").value); var newValue = parseFloat($("#total" + id).text()); var newTotal = currentValue - newValue; document.getElementById("currentTotal").value = newTotal; return newTotal; }).get().join()); $(id).remove(); } Okay, it will do the subtraction portion of the code with no problem, this issue is with the last line to remove the field. If I comment out the rest of the code it will work, but not with the rest of the code. I know this is something simple, yet I can't seem to wrap my mind around it. Can someone please help?

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• deleting and reusing a temp table in a stored precedures

  - by Sheagorath

  Hi I need to SELECT INTO a temp table multiple times with a loop but I just can't do it, because after the table created( in SELECT into you can't simply drop the table at the end of the loop because you can't delete a table and create it again in the same batch. so how can I delete a table in a stored procedure and create it again? here is a snippet of where I am actualy using the temp table which is supposed to be a pivoting algorithm: WHILE @offset<@NumDays BEGIN SELECT bg.*, j.ID, j.time, j.Status INTO #TEMP1 FROM #TEMP2 AS bg left outer join PersonSchedule j on bg.PersonID = j.PersonID and bg.TimeSlotDateTime = j.TimeSlotDateTime and j.TimeSlotDateTime = @StartDate + @offset DROP TABLE #TEMP2; SELECT * INTO #TEMP2 FROM #TEMP1 DROP TABLE #TEMP1 SET @offset = @offset + 1 END

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• RoR live-search (text_field_with_auto_complete) submit.

  - by looneygrc

  I have a "Movies" and a "Actors" table and "Casts" as join-model. To be more specific "Casts" has movie_id, actor_id and rolename. I want in "Movies" form to add a live search to search through actors and a "rolename" text_field and save those to "Casts". I don't know if text_field_with_auto_complete is the right choice but i prefer not to use much javascript because i am not familiar with it. I've been searching all over the internet to find something similar to this without any result. I've manage to get it working with "@actors.each do" but it makes a very long list.

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• Handling missing data

  - by soppotare

  Say I have a simple helpdesk application which logs calls made by users. I would typically have such fields in a table relating to the call e.g. CallID, Description, CustomerID etc. I Would also have a table of customers including CustomerID, Username, Password, FullName etc. Now when a user is deleted from the customers table then the inner join between the calls table and the users table to find out historically which user logged a call would produce no results. How do people usually deal with this? Have seperate customer and useraccount tables Just disable the accounts so the data is still available Record the customers name in the calls table as a seperate field. or any other methods / suggestions?

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• SQL Server: Find Values that don't exist in a table

  - by MacAnthony

  I have a list or set of values that I would like to know which ones do not currently exist in a table. I know I can find out which ones do exist with: SELECT * FROM Table WHERE column1 IN (x,x,x,x,x) The set is the values I am checking against. Is there a way to find out which values in that set do not exist in column1? Basically, I'm looking for the inverse of the sql statement above. This is for a report, so all I need is the values that don't exist to be returned back. I have and could do this with a left join and putting the values in another table, but the values I check are always different and was hoping to find a solution that didn't involve clearing a table and inserting data first. Trying to find a better solution for me if one exists.

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• Why do I get Bind Variable "DeliveryDate_Variable" is NOT DECLARED(Completely New TO Oracle)

  - by GigaPr

  Hi, I have the following script in Oacle I do not understand why i get Bind Variable "DeliveryDate_Variable" is NOT DECLARED Everything looks ok to me VARIABLE RollingStockTypeId_Variable NUMBER := 1; VARIABLE DeliveryDate_Variable DATE := (to_date('2010/8/25:12:00:00AM', 'yyyy/mm/dd:hh:mi:ssam')); SELECT DISTINCT rs.Id, rs.SerialNumber, rsc.Name AS Category, (SELECT COUNT(Id) from ROLLINGSTOCKS WHERE ROLLINGSTOCKCATEGORYID = rsc.id) as "Number Owened", (SELECT COUNT(rs.Id) FROM ROLLINGSTOCKS rs WHERE rs.ID NOT IN( select RollingStockId from ROLLINGSTOCK_ORDER WHERE :DeliveryDate_Variable BETWEEN DEPARTUREDATE AND DELIVERYDATE) AND rs.RollingStockCategoryId IN (Select Id from RollingStockCategories Where RollingStockTypeId = :RollingStockTypeId_Variable) AND rs.RollingStockCategoryId = rsc.Id) AS "Number Available" FROM ROLLINGSTOCKS rs JOIN RollingStockCategories rsc ON rsc.Id = rs.RollingStockCategoryId WHERE rs.ID NOT IN( select RollingStockId from ROLLINGSTOCK_ORDER WHERE :DeliveryDate_Variable BETWEEN DEPARTUREDATE AND DELIVERYDATE ) AND rs.RollingStockCategoryId IN ( Select Id from RollingStockCategories Where RollingStockTypeId = :RollingStockTypeId_Variable ) ORDER BY rsc.Name

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• Google App Engine: Difficulty with Users API (or maybe just a Python syntax problem)

  - by Rosarch

  I have a simple GAE app that includes a login/logout link. This app is running on the dev server at the moment. The base page handler gets the current user, and creates a login/logout url appropriately. It then puts this information into a _template_data dictionary, for convenience of subclasses. class BasePage(webapp.RequestHandler): _user = users.get_current_user() _login_logout_link = None if _user: _login_logout_link = users.create_logout_url('/') else: _login_logout_link = users.create_login_url('/') _template_data = {} _template_data['login_logout_link'] = _login_logout_link _template_data['user'] = _user def render(self, templateName, templateData): path = os.path.join(os.path.dirname(__file__), 'Static/Templates/%s.html' % templateName) self.response.out.write(template.render(path, templateData)) Here is one such subclass: class MainPage(BasePage): def get(self): self.render('start', self._template_data) The login/logout link is displayed fine, and going to the correct devserver login/logout page. However, it seems to have no effect - the server still seems to think the user is logged out. What am I doing wrong here?

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• Spreading dynamic with community structure

  - by YogurtFruit

  I have a data set which I hope to simulate the spreading dynamic with community structure. The steps I follow is import the data to a complex network with Networkx partition the network into some modules which are known as communities simulate the SIS model and draw plots with and without communities. Something confused me between step 2 and step 3. After partitioning, I get some communities which contains nodes number. The community numbers and nodes numbers are the only input to step 3, and how I simulate SIS with and without communities?

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• MySQL - JOINS (excepts)

  - by user2529899

  I'm trying to find 2 different result via JOINS. Table look like; SELECT id,member_id,registered_year FROM records; I can listing which members registered in 2012 and also in 2013 with; SELECT member_id FROM records a INNER JOIN records b ON a.member_id=b.member_id WHERE a.registered_year='2013' AND b.registered_year='2012'; But I can't list revers of It. How can I list which members were registered in 2012 but not in 2013? Thnx in advance.

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