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  • Problem with write query

    - by phenevo
    Hi, I've got collection of geo objects in database: There are four Tables: Countries Regions Provinces Cities Cities has inter alia ProvinceCode Provinces has inter alia regionCode Regions has inter alia CountryCode And there is fifth Table: Descriptions ObjectCode ObjectType(country, region, province, city) Description. How to get from Descriptions table, all descriptions from objects which are in the definite country ??

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  • C# Communication between threads.

    - by GT
    Hi, I am using .NET 3.5 and am trying to wrap my head around a problem (not being a supreme threading expert bear with me). I have a windows service which has a very intensive process that is always running, I have put this process onto a separate thread so that the main thread of my service can handle operational tasks - i.e., service audit cycles, handling configuration changes, etc, etc. I'm starting the thread via the typical ThreadStart to a method which kicks the process off - call it workerthread. On this workerthread I am sending data to another server, as is expected the server reboots every now and again and connection is lost and I need to re-establish the connection (I am notified by the lost of connection via an event). From here I do my reconnect logic and I am back in and running, however what I easily started to notice to happen was that I was creating this worker thread over and over again each time (not what I want). Now I could kill the workerthread when I lose the connection and start a new one but this seems like a waste of resources. What I really want to do, is marshal the call (i.e., my thread start method) back to the thread that is still in memory although not doing anything. Please post any examples or docs you have that would be of use. Thanks.

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  • i don't solve "must declare a body because it is not marked abstract, extern, or partial" problem?

    - by programmerist
    How can i solve "must declare a body because it is not marked abstract, extern, or partial". This problem. Can you show me some advices? Full Error message is about Save, Update, Delete, Select events... Full message sample : GenoTip.DAL._AccessorForSQL.Save(string, System.Collections.Specialized.ListDictionary, System.Data.CommandType)' must declare a body because it is not marked abstract, extern, or partial This error also return in Update, Delete, Select... public abstract class _AccessorForSQL { public virtual bool Save(string sp, ListDictionary ld, CommandType cmdType); public virtual bool Update(); public virtual bool Delete(); public virtual DataSet Select(); } class GenAccessor : _AccessorForSQL { DataSet ds; DataTable dt; public override bool Save(string sp, ListDictionary ld, CommandType cmdType) { SqlConnection con = null; SqlCommand cmd = null; SqlDataReader dr = null; try { con = GetConnection(); cmd = new SqlCommand(sp, con); con.Open(); cmd.CommandType = cmdType; foreach (string ky in ld.Keys) { cmd.Parameters.AddWithValue(ky, ld[ky]); } dr = cmd.ExecuteReader(); ds = new DataSet(); dt = new DataTable(); ds.Tables.Add(dt); ds.Load(dr, LoadOption.OverwriteChanges, dt); } catch (Exception exp) { HttpContext.Current.Trace.Warn("Error in GetCustomerByID()", exp.Message, exp); } finally { if (dr != null) dr.Close(); if (con != null) con.Close(); } return (ds.Tables[0].Rows.Count 0) ? true : false; } public override bool Update() { return true; } public override bool Delete() { return true; } public override DataSet Select() { DataSet dst = new DataSet(); return dst; } private static SqlConnection GetConnection() { string connStr = WebConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; SqlConnection conn = new SqlConnection(connStr); return conn; }

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  • Relational database queestion with php.

    - by Oliver Bayes-Shelton
    Hi, Not really a coding question more a little help with my idea of a Relational database. If I have 3 tables in a SQL database. In my php script I basically query the companies which are in industry "a" and then insert a row into a seperate table with their details such as companyId , companyName etc is that a type of Relational database ? I have explained it in a simple way so we don't get confused what I am trying to say.

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  • Storing Preferences/One-to-One Relationships in Database

    - by LnDCobra
    What is the best way to store settings for certain objects in my database? Method one: Using a single table Table: Company {CompanyID, CompanyName, AutoEmail, AutoEmailAddress, AutoPrint, AutoPrintPrinter} Method two: Using two tables Table Company {CompanyID, COmpanyName} Table2 CompanySettings{CompanyID, utoEmail, AutoEmailAddress, AutoPrint, AutoPrintPrinter}

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  • What are some strategies for maintaining a common database schema with a team of developers and no D

    - by Mahmoud Abdelkader
    I'm curious about how others have approached the problem of maintaining and synchronizing database changes across many (10+) developers without a DBA? What I mean, basically, is that if someone wants to make a change to the database, what are some strategies to doing that? (i.e. I've created a 'Car' model and now I want to apply the appropriate DDL to the database, etc..) We're primarily a Python shop and our ORM is SQLAlchemy. Previously, we had written our models in such a way to create the models using our ORM, but we recently ditched this because: We couldn't track changes using the ORM The state of the ORM wasn't in sync with the database (e.g. lots of differences primarily related to indexes and unique constraints) There was no way to audit database changes unless the developer documented the database change via email to the team. Our solution to this problem was to basically have a "gatekeeper" individual who checks every change into the database and applies all accepted database changes to an accepted_db_changes.sql file, whereby the developers who need to make any database changes put their requests into a proposed_db_changes.sql file. We check this file in, and, when it's updated, we all apply the change to our personal database on our development machine. We don't create indexes or constraints on the models, they are applied explicitly on the database. I would like to know what are some strategies to maintain database schemas and if ours is seems reasonable. Thanks!

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  • For eBook which control i should use and how to start

    - by Aamir Khurshid
    Hi , i want to develop such an application through which i can read book ,currently i am using the Richtextbox in flow document,i dont want to use the scroll ,i prefer the navigation style i.e prev page next page start and end ,book may contains images tables so and so ,and how do i import books in my application How can i achieve? Regards, Aamir

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  • Django Admin Form for Many to many relationship

    - by Anand
    I have a many to many relationship between 2 tables Users an Domains. I have defined this relationship in the Domains class. So in the admin interface I see the Users when I am viewing Domains. But I do not see Domains when I am viewing Users. How can I achieve this.

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  • Reed-Solomon encoder for embedded application (memory-efficient)

    - by bjarkef
    Hi I am looking for a very memory-efficient (like max. 500 bytes of memory for lookup tables etc.) implementation of a Reed-Solomon encoder for use in an embedded application? I am interested in coding blocks of 10 bytes with 5 bytes of parity. Speed is of little importance. Do you know any freely available implementations that I can use for this purpose? Thanks in advance.

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  • Azure Membership UI

    - by Andres
    Using AspProviders (TableStorageMembershipProvider etc) from Microsoft WCF Azure Samples. It is WCF Service Web Role, and in Azure Storage Explorer I can see Membership, Roles and Session tables appearing nicely when I try to connect. But is there any exisiting code to manage Membership and Roles? Some ASPX pages I guess, something like this for plain old ASP.NET, but more modern and Azure-tested hopefully? Thanks, Andres

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  • Any way to change Phppgadmin view order of columns without changing underlying db

    - by nick
    Hey everyone, Is there any way to change the order of the columns phppgadmin views when browsing tables without having to change the underlying db? I have a few columns that I want seperated by heaps of unimportant ones and then a few more important ones at the end. The problem is that the important ones on the right are way of the screen so its hard to check visually if data has been inputed correctly. Cheers

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  • C# and NpgsqlDataAdapter returning a single string instead of a data table

    - by tme321
    I have a postgresql db and a C# application to access it. I'm having a strange error with values I return from a NpgsqlDataAdapter.Fill command into a DataSet. I've got this code: NpgsqlCommand n = new NpgsqlCommand(); n.Connection = connector; // a class member NpgsqlConnection DataSet ds = new DataSet(); DataTable dt = new DataTable(); // DBTablesRef are just constants declared for // the db table names and columns ArrayList cols = new ArrayList(); cols.Add(DBTablesRef.all); //all is just * ArrayList idCol = new ArrayList(); idCol.Add(DBTablesRef.revIssID); ArrayList idVal = new ArrayList(); idVal.Add(idNum); // a function parameter // Select builder and Where builder are just small // functions that return an sql statement based // on the parameters. n is passed to the where // builder because the builder uses named // parameters and sets them in the NpgsqlCommand // passed in String select = SelectBuilder(DBTablesRef.revTableName, cols) + WhereBuilder(n,idCol, idVal); n.CommandText = select; try { NpgsqlDataAdapter da = new NpgsqlDataAdapter(n); ds.Reset(); // filling DataSet with result from NpgsqlDataAdapter da.Fill(ds); // C# DataSet takes multiple tables, but only the first is used here dt = ds.Tables[0]; } catch (Exception e) { Console.WriteLine(e.ToString()); } So my problem is this: the above code works perfectly, just like I want it to. However, if instead of doing a select on all (*) if I try to name individual columns to return from the query I get the information I asked for, but rather than being split up into seperate entries in the data table I get a string in the first index of the data table that looked something like: "(0,5,false,Bob Smith,7)" And the data is correct, I would be expecting 0, then 5, then a boolean, then some text etc. But I would (obviously) prefer it to not be returned as just one big string. Anyone know why if I do a select on * I get a datatable as expected, but if I do a select on specific columns I get a data table with one entry that is the string of the values I'm asking for?

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  • Django Foreign key queries

    - by Hulk
    In the following model: class header(models.Model): title = models.CharField(max_length = 255) created_by = models.CharField(max_length = 255) def __unicode__(self): return self.id() class criteria(models.Model): details = models.CharField(max_length = 255) headerid = models.ForeignKey(header) def __unicode__(self): return self.id() class options(models.Model): opt_details = models.CharField(max_length = 255) headerid = models.ForeignKey(header) def __unicode__(self): return self.id() If there is a row in the database for table header as Id=1, title=value-mart , createdby=CEO How do i query criteria and options tables to get all the values related to header table id=1 Also can some one please suggest a good link for queries examples, Thanks..

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  • Optimal size for Database partitions

    - by Adrian Mouat
    Hi all, I am creating a very simple, very large Postgresql database. The database will have around 10 billion rows, which means I am looking at partitioning it into several tables. However, I can't find any information on how many partitions we should break it into. I don't know what type of queries to expect as of yet, so it won't be possible to come up with a perfect partitioning scheme, but are there any rules of thumb for partition size? Cheers, Adrian.

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  • Relational database question with php.

    - by Oliver Bayes-Shelton
    Hi, Not really a coding question more a little help with my idea of a Relational database. If I have 3 tables in a SQL database. In my php script I basically query the companies which are in industry "a" and then insert a row into a separate table with their details such as companyId , companyName etc is that a type of Relational database ? I have explained it in a simple way so we don't get confused what I am trying to say.

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  • Non-relational database modeling tool?

    - by Angel Escobedo
    Hey guys, please recommend some tools you have used succesfully on DW, DataMart, BI an non-relational modeling. Example for automatic creation of snow-flake Schemas, dimensions and facts tables. Wich tools makes you sense familiarity with the diagrams and surrogates keys and it will have the option for export or connect to SQL Server 2008. Thanks

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  • PIVOT / UNPIVOT in SQL Server 2008

    - by Nev_Rahd
    Hello I got child / parent tables as below. MasterTable: MasterID, Description ChildTable ChildID, MasterID, Description. Using PIVOT / UNPIVOT how can i get result as below in single row. if (MasterID : 1 got x child records) MasterID, ChildID1, Description1, ChildID2, Description2....... ChildIDx, Descriptionx Thanks

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  • mysql unique-constraint

    - by Cypher
    I have two tables -- Variables (id, name) and Variable_Entries (id, var_id, value). I want each variable to have a unique set of entries. If I make the value entry unique then a different variable won't be able to have that same value which is not right. Is there some way to make the value column unique for identical var_id's?

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  • Dataset and SQLCe in .net 4

    - by Tyler Edwards
    I'm trying to build a SQLCe table structure dynamically using a dataset as the temporary table structure... Is there a SqlConnection string that will work with SqlCe? There used to be a SqlCeConnection...but I don't find that in the 4.0 framework? Has something replaced this? If the answer is L2S or Entity Framework...can I add columns to SqlCe tables at runtime? If so...how?

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  • DataTable DataRow Select String with Quotation Marks

    - by RBrattas
    Hi, My string include quotation mark; the select statement crash. vm_TEXT_string = "Hello 'French' People"; vm_DataTable_SELECT_string = "[MyField] = '" + vm_TEXT_string + "'"; DataRow[] o_DataRow_ARRAY_Found = vco_DataTable.Select (vm_DataTable_SELECT_string); I cannot use this statement: string filter = "[MyColumn]" + " LIKE '%" + SearchWord + "%'"; I found string format: DataRow[] oDataRow = oDataSet.Tables["HasDiseas"].Select ( string.Format ( "DName='{0}'", DiseasListBox.SelectedItem.ToString () ) ); Any suggestion to selecta string with quotation mark? Thank you, Rune

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