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• Chain of Responsibility Pattern: is it a good practice to have interdependent handlers?

  - by wei

  I have this scenario: I have a chain of query handlers, the first is to query the cache, if the cache can't answer it or the answer is stale, then hit a database, if it can't find the answer or the answer is stale again, then query a remote web service. But I am not sure if this is the right way to use this pattern, since the work flow is pretty much fixed, and the cache and database handlers depend on the next step's return result to refresh its records.

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• SQL select from data in query where this data is not already in the database?

  - by Michael

  I want to check my database for records that I already have recorded before making a webservice call. Here is what I imagine the query to look like, I just can't seem to figure out the syntax. SELECT FROM (1,2,3,4) WHERE id NOT IN table.id Is there a way to do this? What is a query like this called?

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• Displaying Longitude and Latitude values stored in a SQLite db as a Route on a MapView in Android (N

  - by LordSnoutimus

  I am currently in the process of creating an application that records current location of a mobile device in intervals, displaying the route as a coloured line on the device in real-time. At the same time the application is storing the longitude and latitude in a SQLite database as I want the user to be able to bring up that specific route again. The route has a primary key and each waypoint is linked to that route by a foreign key. What would be the easiest way to display the saved route on the map?.

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• Is there a better way to retrieve unique ID upon INSERT?

  - by Andy

  Hi, I am using the following MS SQL statement to insert records and return the unique auto-inc ID value all in one shot. Wonder if there is a simpler/faster/better way to do it? SET NOCOUNT ON; DECLARE @res table (ID bigint); INSERT INTO [Titles] ([Name],[Timestamp],[Title]) OUTPUT INSERTED.ID INTO @res VALUES ('Name','23 aug 2010','this is a title'); SELECT [ID] FROM @res;

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• SQL server partitioning

  - by durilai

  I have a table that has millions of records and we are looking at implementing table partitioning. Looking at it we have a foreign key "GroupID" that we would like to partition on. Is this possible? The Group will have more entries added to it, so as new GroupID's are added can the partition's be made dynamically?

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• Why this query is so slow?

  - by Silver Light

  This query appears in mysql slow query log: it takes 11 seconds. INSERT INTO record_visits ( record_id, visit_day ) VALUES ( '567', NOW() ); The table has 501043 records and it's structure looks like this: CREATE TABLE IF NOT EXISTS `record_visits` ( `id` int(11) NOT NULL AUTO_INCREMENT, `record_id` int(11) DEFAULT NULL, `visit_day` date DEFAULT NULL, `visit_cnt` bigint(20) DEFAULT '1', PRIMARY KEY (`id`), UNIQUE KEY `record_id_visit_day` (`record_id`,`visit_day`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 ; What could be wrong? Why this INSERT takes so long?

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• How I can Optimize this mySQL transaction within java code?

  - by worldpython

  Dear All, I am new to MySql database. I've large table(ID,...). I select ID frequently with java code and.And that make a heavy load on transaction select from tableName where ID=someID notes: 1.Database could be 100,000 records 2.I can't cache result 3.ID is a primary key 4.I try to optimize time needed to return result from query. Any ideas for optimization ? thanks in advance

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• where can I get these kind of exercises to solve?

  - by flash

  Recently I did a Java programming exercise successfully which was sent by a recruiting firm, The problem statement goes like this 'There are two text files FI(records abt files and directory information) and FS(containing blocks of data) which represent a file Index and file System respectively and I was supposed to write a static read method in a class which will read the file from the FS depending upon the path string provided using FI' My question is where can I get these kind of exercises to solve, the complexity should be above average to tough.

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• Gestion del vencimiento de listas y documentos en sharePoint

  - by vizcaynot

  Hello: Can I do the following with SharePoint 2007: 1) Create lists (records) and document libraries with content that is in force for a certain amount of days and after that, they automatically expire? How? 2) When searching for words in a SharePoint site where there are lists and documents, SharePoint displays results similar to Google, would it be possible that Sharepoint tell me what documents are no longer current? How? Thank you very much.

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• How to select a random record from a MySQL database?

  - by Bruce

  I am using the following query to select 1 random record - SELECT name FROM table WHERE id >= (SELECT FLOOR( MAX(id) * RAND()) FROM table ) ORDER BY id LIMIT 1 but it gives me the same set of records every time I call it. How do I get better random record?

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• MySQL DATE_FORMAT comparison to CURDATE() query...

  - by Crazy Serb

  Hey guys, I am just trying to pull all the records from my database who have a rec_date (varchar) stored as m/d/Y and are expired (as in, less than curdate()), and this call isn't giving me what I want: SELECT member_id, status, DATE_FORMAT(STR_TO_DATE(rec_date, '%m/%d/%Y'), '%Y-%m-%d') AS rec FROM members WHERE rec_date CURDATE() AND status = '1' I'm obviously doing something wrong, so can you help? Thanks.

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• Python: Comparing specific columns in two csv files

  - by coder999

  Say that I have two CSV files (file1 and file2) with contents as shown below: file1: fred,43,Male,"23,45",blue,"1, bedrock avenue" file2: fred,39,Male,"23,45",blue,"1, bedrock avenue" I would like to compare these two CSV records to see if columns 0,2,3,4, and 5 are the same. I don't care about column 1. What's the most pythonic way of doing this? EDIT: Some example code would be appreciated.

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• Spring Web Flow

  - by cedric

  hi. I am really having a problem about what to use as an alternative for web flow. I have read that not all functionalities should be handled by web flow. Only those which needs complex xstate management. For those easy stuffs like just login, editing or deleting records what will I use as an alternative for web flow?

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• Which MySql line is faster:

  - by Camran

  I have a classified_id variable which matches one document in a MySql table. I am currently fetching the information about that one record like this: SELECT * FROM table WHERE table.classified_id = $classified_id I wonder if there is a faster approach, for example like this: SELECT 1 FROM table WHERE table.classified_id = $classified_id Wont the last one only select 1 record, which is exactly what I need, so that it doesn't have to scan the entire table but instead stops searching for records after 1 is found? Or am I dreaming this? Thanks

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• keyboard interaction with Cocoa?

  - by mactonny

  Hey guys, I am trying do write an application(server) which receives the keyboard instructions from the client and execute them on the server end. It's more like those screen recorders which records your keyboard and mouse events and replay them. For example, you pull up a textedit on the server, type whatever you like on the client and you can see those letters on the server. I have no clues what materials I should look into, any suggestions?

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• C#:checking existing record in database Mysql

  - by Meko

  HI.I searched this question inform and I found solution to change column property Unique Index.Now If I try to insert same record cmd.ExecuteNonQuery() gives error that record exist ,but how can use this exception to give user a message that record exist and must enter new one ? I am trying to make some thing like if(cmd.ExecuteNonQuery() !=true ) { MessageBox.Show("User Exists"); } But I dont know what returns cmd.ExecuteNonQuery() ? Or I must get records using reader in table and compare them with text in Textfiel?

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• Why this search can not generate correct result?

  - by user482742

  Hi, All: Below is to find same customer and if he is in list, the number add one. If he is not in the list, just add him in the list. I use Search function to do this, but failed and generated incorrect records. It can not find the customer or the right number of customers. But if I use For..loop to iterate the list, it does well and can find the customer and add new customer in that for..loop search procedure. (I did not paste for ..loop search procedrue here). Another problem is that there is no difference between setting list.sorted true and false. It seems Search function is not correct. This search function is from an example of delphi textbook. The below is with Delphi 7. Thank you. Procedure Form1.create; begin list:=Tstringlist.create; list.sorted:=true; // Search function will generate exactly Same and Incorrect //records no matter list.sorted is set true or false. list.duplicates:=dupignore; .. end; Procedure addcustomer; var .. begin while p1.MatchAgain do begin //p1 is regular expression customer:=p1.MatchedExpression; if (search(customer)=false) then begin list.Add(customer+'=1'); end; allcustomer:=allcustomer+1; .. end; Function Tform1.search(customer: string): boolean; var fre:string; num:integer; L:integer; R:integer; M: Integer; CompareResult: Integer; found: boolean; begin result:=false; found:=false; L := 0; R := List.Count - 1; while (L <= R) and ( not found ) do begin M := (L + R) div 2; CompareResult := Comparetext(list.Names[m]), customer); if (compareresult=0) then begin fre:=list.ValueFromIndex [m]; num:=strtoint(fre); num:=num+1; list.ValueFromIndex[m]:=inttostr(num); Found := True; Result := true; exit; end else if compareresult > 0 then r := m - 1 else l := m + 1; end; end;

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• Automatically update or delete record(s) after x time in coldfusion

  - by Nich

  Hi, I've searched all over the net for this. Hope that someone's got something. How would a record in a database be updated automatically after x time n coldfusion? I know how to manually do it by writing an sql that performs an action to all records older than x time based on the timestamp. How would this be done automatically? Kind Regards, Nich

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• mysql join 3 tables and count

  - by air

  Please look at this image here is 3 tables , and out i want is uid from table1 industry from table 3 of same uid count of fid from table 2 of same uid like in the sample example output will be 2 records Thanks

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• Updating gridview using ado.net entity framework

  - by Ravi

  Hello everyone, I am trying to figure out the best way of getting the record and update in to gridview using ado.net entity framework in C#. I need implement Next & Previous button in gridview and based on pagesize i want to navigate records using Next&Back button. Any one give simple example for this context.

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• LINQ to SQL .Count takes way to much process time and decreases performances.

  - by soldieraman

  LINQ to SQL .Count takes way to much process time and decreases performances. I am doing a recursive loop and for one child (lets call it parent) I have to check the number of children under it to make a decision if it should be included or not. The Count is too slow 8 ms :( for 120 parent records. Any ideas to make it quicker.

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• How to get the exact string within the brackets in mysql

  - by sreenath

  In my mysql table a field values are as follows: table name - "clients" field name - "accent" values are - "Eastern(Northern,Southern),Scottish(East Coast)" "Eastern(South,North,Southern),Scottish(East Coast)" If I give select accent from clients where accent like '%north%' if more than 100 records not in the same order. Strings with in the brackets are not in the same order means. It will give above two values. How should i get only second value? Please help me, thanks.

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• JDBC ResultSet total rows

  - by Zeeshan

  I am implementing Paging in my application. For this i run a query and get a resultset. Now i want to get total no of records in this resultset for my paging calculation. How can i get ? i dont want to execute a extra sql which gives me total rows

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• Query having 2 Where Clause

  - by Harsha M V

  i am trying to login and want to validate username and password against the records in the database. I am not sure how to pass two Where clause public Boolean login(String username, String password) throws SQLException { Cursor mCursor = db.query(TABLE_USERS, new String[] { ID, KEY_NAME, KEY_USERNAME}, KEY_USERNAME + "=" + "'"+username+"'", KEY_PASSWORD + "=" + "'"+password+"'", null, null, null, null, null); if (mCursor.moveToFirst()) { return true; } return false; } Am getting a Syntax Error.

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• C#: Deal with xml, treeview datagridview and datatables

  - by renulren

  Hi all, I am working on a project that pulls data out of an xml files and also uses a tree-grid combination in order to display the data. For example depending on the selected treeview node, the datagridview will display only the records related to that node. What do you think it would be the appropriate approach in dealing with this? Thanks!

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