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• Is there a best practice for maintaining history in a database?

  - by Pete

  I don't do database work that often so this is totally unfamiliar territory for me. I have a table with a bunch of records that users can update. However, I now want to keep a history of their changes just in case they want to rollback. Rollback in this case is not the db rollback but more like revert changes two weeks later when they realized that they made a mistake. The distinction being that I can't have a transaction do the job. Is the current practice to use a separate table, or just a flag in the current table? It's a small database, 5 tables each with < 6 columns, < 1000 rows total.

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• Simple 'database' in c++

  - by DevAno1

  Hello. My task was to create pseudodatabase in c++. There are 3 tables given, that store name(char*), age(int), and sex (bool). Write a program allowing to : - add new data to the tables - show all records - sort tables with criteria : - name increasing/decreasing - age increasing/decreasing - sex Using function templates is a must. Also size of arrays must be variable, depending on the amount of records. I have some code but there are still problems there. Here's what I have: Function tabSize() for returning size of array. But currently it returns size of pointer I guess : #include <iostream> using namespace std; template<typename TYPE> int tabSize(TYPE *T) { int size = 0; size = sizeof(T) / sizeof(T[0]); return size; } How to make it return size of array, not its pointer ? Next the most important : add() for adding new elements. Inside first I get the size of array (but hence it returns value of pointer, and not size it's of no use now :/). Then I think I must check if TYPE of data is char. Or am I wrong ? // add(newElement, table) template<typename TYPE> TYPE add(TYPE L, TYPE *T) { int s = tabSize(T); //here check if TYPE = char. If yes, get the length of the new name int len = 0; while (L[len] != '\0') { len++; } //current length of table int tabLen = 0; while (T[tabLen] != '\0') { tabLen++; } //if TYPE is char //if current length of table + length of new element exceeds table size create new table if(len + tabLen > s) { int newLen = len + tabLen; TYPE newTab = new [newLen]; for(int j=0; j < newLen; j++ ){ if(j == tabLen -1){ for(int k = 0; k < len; k++){ newTab[k] = } } else { newTab[j] = T[j]; } } } //else check if tabLen + 1 is greater than s. If yes enlarge table by 1. } Am I thinking correct here ? Last functions show() is correct I guess : template<typename TYPE> TYPE show(TYPE *L) { int len = 0; while (L[len] == '\0') { len++; } for(int i=0; i<len; i++) { cout << L[i] << endl; } } and problem with sort() is as follows : Ho can I influence if sorting is decreasing or increasing ? I'm using bubble sort here. template<typename TYPE> TYPE sort(TYPE *L, int sort) { int s = tabSize(L); int len = 0; while (L[len] == '\0') { len++; } //add control increasing/decreasing sort int i,j; for(i=0;i<len;i++) { for(j=0;j<i;j++) { if(L[i]>L[j]) { int temp=L[i]; L[i]=L[j]; L[j]=temp; } } } } And main function to run it : int main() { int sort=0; //0 increasing, 1 decreasing char * name[100]; int age[10]; bool sex[10]; char c[] = "Tom"; name[0] = "John"; name[1] = "Mike"; cout << add(c, name) << endl; system("pause"); return 0; }

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• Create a complex SQL query?

  - by mazzzzz

  Hey guys, I have a program that allows me to run queries against a large database. I have two tables that are important right now, Deposits and withdraws. Each contains a history of every user. I need to take each table, add up every deposit and withdraws (per user), then subtract the withdraws from the deposits. I then need to return every user whos result is negative (aka they withdrew more then they deposited). Is this possible in one query? Example: Deposit Table: |ID|UserName|Amount| |1 | Use1 |100.00| |2 | Use1 |50.00 | |3 | Use2 |25.00 | |4 | Use1 | 5.00 | WithDraw Table: |ID|UserName|Amount| |2 | Use2 | 5.00 | |1 | Use1 |100.00| |4 | Use1 | 5.00 | |3 | Use2 |25.00 | So then the result would output: |OverWithdrawers| | Use2 | Is this possible (I sure don't know how to do it)? Thanks for any help, Max

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• Declare global variables for a batch of execution statements - sql server 2005

  - by Shrewd Demon

  hi, i have an SQL statement wherein i am trying to update the table on the client's machine. the sql statement is as follows: BEGIN TRANSACTION DECLARE @CreatedBy INT SELECT @CreatedBy = [User_Id] FROM Users WHERE UserName = 'Administrator' --//////////////////////////////////////////////////////////////////// --//////////////////////////////////////////////////////////////////// PRINT @CreatedBy --(Works fine here and shows me the output) PRINT N'Rebuilding [dbo].[Some_Master]' ALTER TABLE [dbo].[Some_Master] ADD [CreatedBy] [BIGINT] NULL, [Reason] [VARCHAR](200) NULL GO PRINT @CreatedBy --(does not work here and throws me an error) PRINT N'Updating data in [Some_Master] table' UPDATE Some_Master SET CreatedBy = @CreatedBy COMMIT TRANSACTION but i am getting the following error: Must declare the scalar variable "@CreatedBy". Now i have observed if i write the Print statement above the alter command it works fine and shows me its value, but if i try to print the value after the Alter command it throws me the error i specified above. I dont know why ?? please help! Thank you

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• Show data relationship in gridview with dropdownlist or similar?

  - by Anders Svensson

  I have data coming from two tables with a foreign key relationship - one User table containing users of the web application, and one Page table containing details about pages visited by each user. I would like to be able to view these data in a gridview or the like on a page. It's easy enough to just show the User table data like so (I'm using the Entity Framework and LINQ): UserDBEntities context = new UserDBEntities(); GridView1.DataSource = from user in context.UserSet select new { user.Ip, user.Count, user.Description, user.Referer }; GridView1.DataBind(); But how can I show the Page details? I'm not bent on any particular way of showing it, but the only idea I've been able to come up with is to have a dropdown list for each user in a column. But I can't figure out how to get the page data into such a dropdown list. The tables are associated with the primary/foreign key UserID. Any ideas would be welcome (dropdownlist solution or other)!

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• How to access data binding object in aspx page in ASP.NET?

  - by weilin8

  I am trying to hide or show a certain section of my table depending on the value of a property in my binding object(s). public class Class1 { public bool Display { get; set; } } In ASP.NET MVC, I can just do the following (assuming that Class1 is the model that binds to the page.) <table> <tr>Row 1</tr> <tr>Row 2</tr> <% if(Model.Display) { %> <tr>Row 3</tr> <tr>Row 4</tr> <% } %> </table> How can I achieve the same behavior in transitional ASP.NET? That "Model" variable is not available. How do I retrieve the data binding object? Thanks.

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• How to map a search object to a class with more fields with JPA annotations

  - by Moli

  Hi all, I'm a newbie with JPA. I need to map a search object to a table. The search object has only and id, name. The big object has more fileds id, name, adress and more. I use this as big object view plaincopy to clipboardprint? I use this as big object @Entity @Table(name="users") public class User { @Id @GeneratedValue(strategy = GenerationType.AUTO) private long id; private String name; private String adress; private String keywords; } //this is my search object @XXX public class UserSearch { @Id @GeneratedValue(strategy = GenerationType.AUTO) private long id; private String name; } What annotations I need to use to map the search object to the table users? I'm using spring+struts2+hibernate+JPA. Help is appreciated! Thanks!

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• How to search for a specific word in a row in MYSQL?

  - by user220755

  I have a row that has keywords in this way (keyword1, keyword2, keyword3) separated by commas as shown. When a user signs in, you know that he wants information about (keyword1, keyword3). Now, I have another table that has bunch of information related to different keywords, this table has a row called (keywords) which indicates if this information is suitable for which keyword. How do I render for the user the information he needs depending on the keywords. In other words, if the user wants information about (keyword3, keyword1) how do I go to the (information) table and find all the information that has the word (keyword1) or the word (keyword3) in the row (keyword)? Sorry if this is complicated (my explanation) but I tried my best to explain it. Thank you in advance :)

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• How to read changed values with native query during one transaction? (Spring and JPA)

  - by knarf1983

  We have container transaction with Spring and JPA (Hibernate). I need to make an update on a table to "flag" some rows via native statements. Then we insert some rows via EntityManager from JPATemplate to this table. After that, we need to calculate changes in the table via native statement (with Oracle's union and minus, complex groups...) I see that changes from step 1 and 2 are not commited and thats why the statement from 3 fails. I already tried with transaction propagation REQUIRES_NEW, EntityManager.flush... Didn't work. 1) update SOMETABLE acolumn = somevalue (native) 2) persist some values into SOMETABLE (via entity manager) 3) select values from SOMETABLE Is there a possibility to read the changes from step 1 and 2 in step 3?

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• Ruby on Rails: Best way to save search queries in a database

  - by Adam Templeton

  For a RoR app I'm helping develop, I need to save all search queries in a database so I can analyze them later. My plan right now is to create a Result model and table, and just save each search query's text in that table, along with a user's ID, the time, etc. However, the app has about 15,000 users, so I'm afraid the single table approach won't be super efficient when it comes time to parse that data. (The database is setup via MySQL, if that factors in at all.) Am I just being paranoid? Is there a Ruby gem that handles this sort of thing, or a better approach I could take? Any input would be appreciated.

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• MySQL - Find entries that refer to a specified index.

  - by Conor H

  Hi, So I have a booking system where I have a 'lesson_type' table with 'lesson_type_id' as PK. I have a constraint in place here so I can't delete a lesson_type if there are bookings made for that lesson_type. I would like to be able to determine if this lesson_type_id is being referred to by any entries in the bookings table (or any other table for that matter) so I can notify the user gracefully. i.e. not have a mysql error be thrown when they try and delete a record. What kind of query would I use for this? Thanks.

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• Sqlalchemy: Many to Many relationship error

  - by 1001010101

  Dear everyone, I am following the Many to many relationship described on http://www.sqlalchemy.org/docs/mappers.html#many-to-many #This is actually a VIEW tb_mapping_uGroups_uProducts = Table( 'mapping_uGroups_uProducts', metadata, Column('upID', Integer, ForeignKey('uProductsInfo.upID')), Column('ugID', Integer, ForeignKey('uGroupsInfo.ugID')) ) tb_uProducts = Table( 'uProductsInfo', metadata, Column('upID', Integer, primary_key=True) ) mapper( UnifiedProduct, tb_uProducts) tb_uGroupsInfo = Table( 'uGroupsInfo', metadata, Column('ugID', Integer, primary_key=True) ) mapper( UnifiedGroup, tb_uGroupsInfo, properties={ 'unifiedProducts': relation(UnifiedProduct, secondary=tb_mapping_uGroups_uProducts, backref="unifiedGroups") }) where the relationship between uProduct and uGroup are N:M. When I run the following sess.query(UnifiedProduct).join(UnifiedGroup).distinct()[:10] I am getting the error: sqlalchemy.exc.ArgumentError: Can't find any foreign key relationships between 'uProductsInfo' and 'uGroupsInfo' What am I doing wrong?

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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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• Ensuring uniqueness on a varchar greater than 255 in MYSQL/InnoDB

  - by Vijay Boyapati

  I have a table which contains HTML entries for news pages. When I initially designed it I used URL as the primary key. I've learned the error of my ways because left-joining is super slow. So I want to redesign the table with an integer (id) primary key, but still keep the rows unique based on the URL. The problem is that I've found URLs longer than 255 characters, and MySQL isn't letting my create a key on the URL. I'm using an InnoDB/UTF8 table. From what I understand it's using multiple bytes per character with a limit of 766 bytes for the key (in InnoDB). I would really love suggestions on an elegant way of keeping the rows unique based on URL, while using an integer primary key. Thanks!

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• Two DomainContext or data sources with WCF RIA - Silverlight page

  - by Mayur Kotlikar

  I am writting a Silverlight Business Application with WCF RIA link. I have 2 databases on same SQL server, Public and Private. The Public database contains a table which is mostly for public access level, like "user" table which has basic user information The Private database contains a table which has "private" information, user bank transactions etc I created 2 ADO.Net entity models, one each for Private and Public database and selected the tables. I also created 2 different domain context services On on Silverlight page, I need to get information from the tables that are across 2 databases, Private and Public as described above. How do I achieve this? I am thinking of some kind of a wrapper that internally gets data from domain services. Whats the best approach?

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• Sorting records datewise in datatable.

  - by Harikrishna

  I have datatable and I am storing the records in that datatable. Now one of the column in the datatable is type of DateTime.That column I added by code Table.Columns.Add(new DataColumn("TradingDate",System.Type.GetType("System.DateTime"))); Now I want to sort the records datewise in ascending order. I have used following code but the records are not sorted. DataView view = new DataView(Table); view.Sort = "TradingDate ASC"; dataGridView1.DataSource=view.Table; But records are not sorted so how to do it ?

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• full-text property change on column

  - by matt99

  Hello, i'm trying to modify a property of a column (in sql server 2008 r2) which is of xml data type. I want set (Is full-text indexed) to yes, but after I do this and try to save changes, i get an error: 'Abc' table - Unable to modify table. Column: B is not full-text searchable. Column B is not the column I'm modyfing, but it's content is based on the modified xml column (it takes a value from one element in xml). Weird thing is that column B is full-text indexed (in table designer). Any ideas why i cannot apply changes to the xml column?

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• jQuery infinite loop w/ tablesorter

  - by Wells

  Got myself in a funny situation: page has three tables. Using sortEnd, any time you sort one table, it sorts the other three. However, since I bound sortEnd to the function that does the sorting, you get a infinite loop of sorting/resorting. It looks like: $("table.tablesorter").tablesorter({widgets: ['zebra']}).bind("sortEnd", function() { $(this).find("th.headerSortDown,.headerSortUp").each(function(i) { index = $(this).attr("cellIndex"); order = ($(this).is(".headerSortDown")) ? 1 : 0; $("table.tablesorter").tablesorter({sortList: [[index,order]]}); }); }); Any tips on how to clean this up?

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• UIPickerView in iphone

  - by Harita

  hi, i am making an application of iphone, in which i have a table view, on every row of table view i have created a button programmatically & on its click method am showing picker view. Picker view showing perfectly, on picker view's toolbar i have 2 barbuttonitem named Done & Cancel. i have added below code in Picker view's delegate method but button title is not changing with this delegate method static int _selectedRow; -(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component { NSString *title = [pickarray objectAtIndex:_selectedRow]; //[pickarray removeObjectAtIndex:_selectedRow]; [pickarray insertObject:title atIndex:_selectedRow]; [table reloadData]; } Any ideas how to show selected row title on button?

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• select columns by a concat text as columnname in oracle

  - by glaudiston

  I have a table with columns named with the number of hour of day like this: col00 NUMBER(5) col01 NUMBER(5) col02 NUMBER(5) ... col23 NUMBER(5) ...and I have another query that returns a count by hour. I want to recover the colXX value by hour.... then I can recover with "decode" or "case when..." but I want know if exists any way to recover the column by a text like this: select "col"||hour from table; in the hypothetical above example if hour is 13 then would be translated like: select col13 from table; there is any way to do this ?

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• MySQL: Selecting One Record When Others Have Same Data

  - by LoganFrederick

  I have a table of cities that all share the same area code: 367 01451 Harvard Worcester Massachusetts MA 978 Eastern 368 01452 Hubbardston Worcester Massachusetts MA 978 Eastern 369 01453 Leominster Worcester Massachusetts MA 978 Eastern The table has multiple area codes, all with multiple cities. What I'd like to do is only select one city from each area code and delete any extra cities from duplicate area codes. What would be the best query to accomplish this? I believe: http://stackoverflow.com/questions/596629/mysql4-sql-for-selecting-one-or-zero-record Is coming close to what I need but didn't quite get what/how those answers were working. Note The "978" row is the "area_code" row, table name is "zip_code".

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• Jquery convert string of one type to string array.....

  - by chandru_cp

  Consider a string which is {"Table" : [{"Bird" : "Peacock"}, {"Bird" : "Crow"}]} to this ["Peacock", "Crow"] in jquery... Is this possible? EDIT: I am doing this but didnt work... $(document).ready(function() { var obj = JSON.parse('{"Table" : [{"Bird" : "Peacock"},{"Bird" : "Crow"}]}'); myarray = []; $.each(obj.table, function(i, v) { myarray.push(v.Bird); }); $("#tags").autocomplete(myarray, { width: 138, max: 4, highlight: false, multiple: true, multipleSeparator: " ", scroll: true, scrollHeight: 300 }); });

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• select columns by a conact text as columnname in oracle

  - by glaudiston

  I have a table with columns named with the number of hour of day like this: col00 NUMBER(5) col01 NUMBER(5) col02 NUMBER(5) ... col23 NUMBER(5) ...and I have another query that returns a count by hour. I want to recover the colXX value by hour.... then I can recover with "decode" or "case when..." but I want know if exists any way to recover the column by a text like this: select "col"||hour from table; in the hypothetical above example if hour is 13 then would be translated like: select col13 from table; there is any way to do this ?

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• Archiving rows dynamically

  - by Serge

  I was wondering what would be the best solution to dynamically archive rows. For instance when a user marks a task as completed, that task needs to be archived yet still accessible. What would be the best practices for achieving this? Should I just leave it all in the same table and leave out completed tasks from the queries? I'm afraid that over time the table will become huge (1,000,000 rows in a year or less). Or should I create another table ie task_archive and query that row whenever data is needed from it? I know similar questions have been asked before but most of them where about archiving thousands of rows simultaneously, I just need to know what would be the best method (and why) to archive 1 row at a time once it's been marked completed

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• Insert consecutive numbers

  - by Markus

  Hi. I have a table A (Acons, A1, A2, A3) in which I should insert information from another table B with columns (B1, B2, B3). The Acons is a column in which should contain some consecutive numbers (it is not an identity and I cannot make it identity). I know xmin - starting the from number the sequence has to be computed. How can I insert the rows into the table A, using a single Insert statement? I tried like the following, but it didn't work: DECLARE @i AS INT; SET @i = xmin; INSERT INTO A(Acons, A1, A2, A3) SELECT @i = (Bcons = (@i + 1)), B1, B2, B3 FROM B Unfortunatelly, the above solution does not work;

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