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• How to recalculate primary index?

  - by JohnM2

  I have table in mysql database with autoincrement PRIMARY KEY. On regular basis rows in this table are being deleted an added. So the result is that value of PK of the latest row is growing very fast, but there is not so much rows in this table. What I want to do is to "recalculate" PK in this way, that the first row has PK = 1, second PK = 2 and so on. There are no external dependencies on PK of this table so it would be "safe". Is there anyway it can be done using only mysql queries/tools? Or I have to do it from my code?

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• How to strore Java Date to Mysql datetime...?

  - by user275843

  can any body tell me how can i store Java Date to Mysql datetime...? when i am trying to do so...only date is stored and time remain 00:00:00 in mysql date stores like this... 2009-09-22 00:00:00 i want not only date but also time...like 2009-09-22 08:08:11 please help me.... EDIT---- i am using JPA(Hibernate) with spring mydomain classes uses java.util.Date but i have created tables using handwritten queries... this is my create statement CREATE TABLE ContactUs (id BIGINT auto_increment, userName VARCHAR(30), email VARCHAR(50), subject VARCHAR(100), message VARCHAR(1024), messageType VARCHAR(15), contactUsTime datetime, primary key(id))TYPE=InnoDB;

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• C++ associative array with arbitrary types for values

  - by Gerald Kaszuba

  What is the best way to have an associative array with arbitrary value types for each key in C++? Currently my plan is to create a "value" class with member variables of the types I will be expecting. For example: class Value { int iValue; Value(int v) { iValue = v; } std::string sValue; Value(std::string v) { sValue = v; } SomeClass *cValue; Value(SomeClass *v) { cValue = c; } }; std::map<std::string, Value> table; A downside with this is you have to know the type when accessing the "Value". i.e.: table["something"] = Value(5); SomeClass *s = table["something"].cValue; // broken pointer Also the more types that are put in Value, the more bloated the array will be. Any better suggestions?

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• What features of Scala cannot be translated to Java?

  - by Paul

  The Scala compiler compiles direct to Java byte code (or .NET CIL). Some of the features of Scala could be re-done in Java straightforwardly (e.g. simple for comprehensions, classes, translating anonymous/inner functionc etc). What are the features that cannot be translated that way? That is presumably mostly of academic interest. More usefully, perhaps, what are the key features or idioms of Scala that YOU use that cannot be easily represented in Java? Are there any the other way about? Things that can be done straightforwardly in Java that have no straightforward equivalent in Scala? Idioms in Java that don't translate?

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• Mapping tables from an existing database to an object -- is Hibernate suited?

  - by Bernhard V

  Hello! I've got some tables in an existing database and I want to map them to a Java object. Actually it's one table that contains the main information an some other tables that reference to such a table entry with a foreign key. I don't want to store objects in the database, I only want to read from it. The program should not be allowed to apply any changes to the underlying database. Currently I read from the database with 5 JDBC sql queries and set the results then on an object. I'm now looking for a less code intensive way. Another goal is the learning aspect. Is Hibernate suitable for this task, or is there another ORM framework that better fits my requirement?

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• Cannot commit in sqlite using a wrapper

  - by user271753

  - (IBAction)SetupButtonPressed:(id)sender { Sqlite *sqlite = [[Sqlite alloc] init]; NSString *writableDBPath = [[NSBundle mainBundle]pathForResource:@"Money"ofType:@"sqlite"]; if (![sqlite open:writableDBPath]) return; [sqlite executeNonQuery:@"CREATE TABLE test (key TEXT NOT NULL, num INTEGER, value TEXT);"]; } Hey guys the above code runs at first but the next time , the table does not exists in the database ! I am using http://th30z.netsons.org/2008/11/objective-c-sqlite-wrapper/ what am I doing wrong ? Or could you please suggest me a really simple tutorial for core data ?

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• MaximumErrorCount has now effect

  - by Rob Bowman

  Hi I'm quite new to SSIS - using 2008 version. I have a job that uses a few data flow tasks. On the third one I'm getting a primary key violation on the last row that it needs to insert, but only sometimes! I'd like to ignore this problem for now and let the job continue. I have set the MaximumErrorCount property to 10 for the DataFlowTaks, the SequenceContainer and for the Package but still taks fails and this causes the package to stop. Could anyone please advise how I can get the package to ignore the error? Thanks Rob.

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• Copy new records from datatable and identify changes in old records

  - by Betite

  Assume there are two tables: Remote_table and My_table. Remote_table has 6 columns: **PROJECT JOB_TYPE MONTH YEAR** HOURS IS_DELETED 134393 70 1 2013 30 0 134393 70 2 2013 50 0 134393 70 3 2013 80 0 134393 70 10 2012 10 0 134393 70 11 2012 0 0 134393 70 12 2012 15 0 My_table is a copy of remote_table. I tried to copy only the new records from the remote_table by this query: SELECT * FROM [remote_DB].[LudanProjectManager].[dbo].Remote_table EXCEPT SELECT * FROM My_table It works OK but I get a duplicate primary key exception when changes have been made on the remote_table on the hours column. Can anyone think of a way to copy only the new records from remote_table and if changes has been made on old records, to identify them and update the my_table to correspond?

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• How can I catch a change event from an HTML text field when a user clicks on a link after editing?

  - by Eric the Red

  Our webapp has a form with fields and values that change depending on values entered. Each time there is a change event on one of the form elements, we use an expensive AJAX call to update other elements on the page. This works great for selects, radio buttons and checkboxes. The issue comes in when a user adds content to a text field, and then clicks a link without taking the focus from the text field. The browser moves to a new page, and the contents of the text field are never saved. Is there an easy way to code around this? The AJAX call is too expensive to call with each key press. Here's an example of my Prototype code at the moment: $$('.productOption input.text').invoke('observe', 'change', saveChangeEvent);

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• How to speed up saving data to database over the internet?

  - by robert_d

  I am using C#, Entity Framework and SQL Server 2008 Express. I am connected to the database over the internet. What is the best method to speed up saving/updating data to database? It takes 87 seconds to save 180 records to the database. It takes only 3.5 seconds to save the same number of records to local (on the same machine) SQL Server. For every record that I save/update I check if record with this primary key exists in the database, if it doesn't exists I simply save it, if it exists I update it using ObjectContext.ApplyCurrentValues(entitySetName, currentEntity) method.

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• How to capture the value change of numericUpDown ctrl real-time in .NET?

  - by Carlos_Liu

  I have implement the ValueChanged event, but I found it will be triggered only after change the focus from numericUpDown to other control or by clicking the up/down arrow. Inputting the value in the control will not trigger ValueChanged event. What I did now is adding an KeyDown event and judge if the input value is numeric (can not include SHIFT/CTRL/ALT key); but there is another case need to be involved: the user can paste value into the numericUpDown ctrl What I need is : When I was typing numeric value (only numeric) in the numericUpDown ctrl, it will known the content has been changed; When pasted a numeric value into the ctrl, it also kowns the content changed

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• Mimic Sublime Text multiselect in Notepad++ using autohotkey

  - by capnhud

  In sublime text 2 you can multi select(cursor) lines by holding ctrl+alt+arrow key (up/down). In notepad++ you can accomplish the same thing by holding ctrl and clicking the additional lines(areas) you would like to edit. I figured I could use a autohotkey script to accomplish the same functionality. So I tried #IfWinActive, ahk_class Notepad++ ^!Down::^Click but each time that I try to load the script I get Error at Line 2 Line Text: ^Click Error: This line does not contain a recognized action the program will exit then I tried #IfWinActive, ahk_class Notepad++ ^!Down::send ^Click but that shows up as ETXClick in notepad++ What more do I need to get this script to work only for Notepad++

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• How to implement B+ Tree for file systems ?

  - by user312544

  I have a text file which contains some info on extents about all the files in the file system, like below C:\Program Files\abcd.txt 12345 100 23456 200 C:\Program Files\bcde.txt 56789 50 26746 300 ... Now i have another binary which tries to find out about extents for all the files. Now currently i am using linear search to find extent info for the files in the above mentioned text file. This is a time consuming process. Is there a better way of coding this ? Like Implementing any good data structure like BTree. If B+ Tree is used what is the key, branch factor i need to use ?

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• How to measure Silverlight or Flash control load time with Google Analytics

  - by ddehghan

  Hi everyone I have a simple silverlight page for for finding available domain names. This problem is equaly valid for a flash control as well. I use Google Analytics for monitoring the traffic. I would like to find out how long it take for users to download and render the Silverlight control. Once the java script on a page is loaded there should be a way to start a timer and then stop the timer once the Silverlight/flash control is loaded. Key points I would like to measure are: Time it takes to download the silverlight/flash control Time it takes to initialize the control Thanks

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• Accessing inter-schema tables and relations in hibernate

  - by nitesh

  There is a typical situation being faced where different tables are scattered through different schemas in Oracle database and they are related to each other (encompassing all different types of relations). How can they be represented in Hibernate using annotations as when a sessionfactory handle is created for one schema, tables in that schema can't access other related tables (foreign key relation to tables in other schema)? For a query like following, exception is thrown - "from table1 as model where model.table2Name.table2column = "+foo Exception comes as - org.hibernate.QueryException: could not resolve property: table2column of: com.test.table1 [from com.test.table1 as model where model.table2Name.table2column = 1] Here table1 and table2 are present in different schemas.

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• "No XML content. Please add a root view or layout to your document"

  - by evc

  I am trying to code a softkeyboard for 2.1 and up when I code ( see code below) in the main.xml graphical view is displays nothing and says No XML content. Please add a root view or layout to your document" I have tried to place the code in textview but still no luck I can not get the softkeyboard to show at all, its as if my code is being ignored..I have tried these two codes separately nothing works <com.example.android.softkeyboard.LatinKeyboardView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/keyboard" android:layout_alignParentBottom="true" android:layout_width="match_parent" android:layout_height="wrap_content" /> <Keyboard android:keyWidth="%10p" android:keyHeight="50px" android:horizontalGap="2px" android:verticalGap="2px" > <Row android:keyWidth="32px" > <Key android:keyLabel="A" /> ... </Row> ... </Keyboard>

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• Alternates to C++ Reference/Pointer Syntax

  - by Jon Purdy

  What languages other than C and C++ have explicit reference and pointer type qualifiers? People seem to be easily confused by the right-to-left reading order of types, where char*& is "a reference to a pointer to a character", or a "character-pointer reference"; do any languages with explicit references make use of a left-to-right reading order, such as &*char/ref ptr char? I'm working on a little language project, and legibility is one of my key concerns. It seems to me that this is one of those questions to which it's easy for a person but hard for a search engine to provide an answer. Thanks in advance!

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• Shortest command to calculate the sum of a column of output on Unix?

  - by Andrew

  I'm sure there is a quick and easy way to calculate the sum of a column of values on Unix systems (using something like awk or xargs perhaps), but writing a shell script to parse the rows line by line is the only thing that comes to mind at the moment. For example, what's the simplest way to modify the command below to compute and display the total for the SEGSZ column (70300)? ipcs -mb | head -6 IPC status from /dev/kmem as of Mon Nov 17 08:58:17 2008 T ID KEY MODE OWNER GROUP SEGSZ Shared Memory: m 0 0x411c322e --rw-rw-rw- root root 348 m 1 0x4e0c0002 --rw-rw-rw- root root 61760 m 2 0x412013f5 --rw-rw-rw- root root 8192

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• BeanUtils getPropertyOfMapBean

  - by dx-cp

  Hi, Im wondering if it is possible to get data from property which is map cotaining pairs Key-StringArray (Map) in BeanUtils library. I just simply need to access one of array elements by calling propertyName=string[0]. Current version (1.8.3) does not support indexed properties. If you look into their code you will find in class PropertyUtilsBean in method getPropertyOfMapBean: if (resolver.isIndexed(propertyName) || resolver.isMapped(propertyName)) { throw new IllegalArgumentException( "Indexed or mapped properties are not supported on" + " objects of type Map: " + propertyName); } way too bad:-( Have any of you any tip how to do it somehow differently?

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• Database design efficiency with 1 to many relationships limited 1 to 3

  - by Joe

  This is in mysql, but its a database design issue. If you have a one to many relationship, like a bank customer to bank-accounts, typically you would have the table that records the bank-account information have a foreign key that keeps track of the relationship between account and customer. Now this follows the 3rd normal form thing and is a widely accepted way of doing it. Now lets say that you are going to limit a user to only having 3 accounts. The current database implementation will support this and nothing would need to change. But another way to do this would have 3 coloms in the account table that have the id of the 3 respective accounts in them. By the way this violates 1st normal form of db design. The question is what would be the advantage and disadvantages of having the user account relationship recored in this way over the traditional?

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• SQL Server 2000, how to automate import data from excel

  - by Stan

  Say the source data comes in excel format, below is how I import the data. Converting to csv format via MS Excel Roughly find bad rows/columns by inspecting backup the table that needs to be updated in SQL Query Analyzer truncate the table (may need to drop foreign key constraint as well) import data from the revised csv file in SQL Server Enterprise Manager If there's an error like duplicate columns, I need to check the original csv and remove them I was wondering how to make this procedure more effecient in every step? I have some idea but not complete. For step 2&6, using scripts that can check automatically and print out all error row/column data. So it's easier to remove all errors once. For step 3&5, is there any way to automatically update the table without manually go through the importing steps? Could the community advise, please? Thanks.

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• Obtain all keys of a Neo4j index

  - by MattiSG

  I have a Neo4j database whose content is generated dynamically from a big dataset. All “entry points” nodes are indexed on a named index (IndexManager.forNodes(…)). I can therefore look up a particular “entry point” node. However, I would now like to enumerate all those specific nodes, but I can't know on which key they were indexed. Is there any way to enumerate all keys of a Neo4j Index? If not, what would be the best way to store those keys, a data type that is eminently non-graph-oriented? UPDATE (thanks for asking details :) ): the list would be more than 2 million entries. The main use case would be to never update it after an initialization step, but other use cases might need it, so it has to be somewhat scalable. Also, I would really prefer avoiding killing my current resilience abilities, so storing all keys at once, as opposed to adding them incrementally, would be a last-resort solution.

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• Sorting NSTableColumn contents

  - by Yahoo

  Hey, I have a problem with sorting NSTableColumn contents. In my NSTableView there are three columns: File, Size, Path. The contents are stored in NSMutableArray. Each object in this array is a NSDictionary containing three keys: file, size and path - value for each is a NSString. In Interface Builder, in each Table Column's attributes I can choose sorting options: Selector: IB entered "compare:" which I think is ok, because I compare NSStrings. Sort Key - and that's the problem I think - I don't know what to enter here. Any clues? If you've got questions about my code, please ask.

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• Generate MySQL data dump in SQL from PHP

  - by Álvaro G. Vicario

  I'm writing a PHP script to generate SQL dumps from my database for version control purposes. It already dumps the data structure by means of running the appropriate SHOW CREATE .... query. Now I want to dump data itself but I'm unsure about the best method. My requirements are: I need a record per row Rows must be sorted by primary key SQL must be valid and exact no matter the data type (integers, strings, binary data...) Dumps should be identical when data has not changed I can detect and run mysqldump as external command but that adds an extra system requirement and I need to parse the output in order to remove headers and footers with dump information I don't need (such as server version or dump date). I'd love to keep my script as simple as I can so it can be hold in an standalone file. What are my alternatives?

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• C# Reflection - How can I tell if object o is of type KeyValuePair and then cast it?

  - by Logan

  Hi All I'm currently trying to write a Dump() method from LinqPad equivalent iin C# for my own amusment. I'm moving from Java to C# and this is an exercise rather than a business requirement. I've got almost everything working except for Dumping a Dictionary. The problem is that KeyValuePair is a Value type. For most other Value types I simply call the ToString method but this is insufficient as the KeyValuePair may contain Enumerables and other objects with undesirable ToString methods. So I need to work out if it's a KeyValuePair and then cast it. In Java I could use wildcard generics for this but I don't know the equivalent in C#. Your quest, given an object o, determine if it's a KeyValuePair and call Print on its key and value. Print(object o) { ... } Thanks!

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