How To Read A Single Row In A Strongly Types Dataset?
Mar 5, 2007
I'm using strongly typed datasets in my first ASP.NET 2.0 web application. I come from ASP Classic, not an earlier version of .NET, and feel like I'm in another world. I'm slowly getting my head around datasets, but one thing I can't find any information on is how to read the data in a single record?
I'm not talking about for next loops, or accessing row information as a repeater or other control is filled. I'm talking about reading the data returned by a method that returns a table containing a single record. This is what I have:
Dim BookAdapter As New BooksTableAdapters.BooksBBTableAdapter
Dim organizations As Books.BooksBBDataTable
Dim organization As Books.BooksBBRow
Dim sDropOff As String
Dim sOrganization As String
Dim sContact
For Each organization In organizations
If organization.DropOff = 1 Then
sDropOff = "True"
Else
sDropOff = "False"
End If
sOrganization = organization.Organization
sContact = organization.ContactName
Next
I'm using the FOR NEXT, but this is silly since I only have one record. GetDataByOneBook(sBookID) does exactly what is says, it returns a single book with a specific bookID.
Not only is this silly, it doesn't work. Using sContact as an example, it's Dim'd as a string. In the FOR NEXT loop, organization.ContactName has the right value, and it appears to be assigned to sContact correctly, but when I try to use sContact in sBody, I get an error saying that sContact has been used before it is assigned a value. Maybe the variables lose their scope outside the loop? Maybe I could get around this by building sBody inside the loop, but there has to be a better way!
Diane
When I insert the fields using parameters, the params look like this: paramValues(10) = New SqlParameter("@RegHrs", SqlDbType.Decimal) paramValues(11) = New SqlParameter("@OTHrs", SqlDbType.Decimal) paramValues(12) = New SqlParameter("@TotHrs", SqlDbType.Decimal)
The fields in the SQL table are defined as: RegHrs - decimal (9,2) OTHrs - decimal (9,2) TotHrs - decimal (9,2)
Before I insert the row (from w/in the VB code), I stop the code and verify that the values being placed into the params are: 5.85 0 5.85
After the SQL insertion, the values w/in the SQL Table contain: 6 0 6
Like the subject says, I'm using strongly typed datasets. I'm using to designer to create the datasets and the methods. I can select and insert, but I can't update or delete. I right click on the adapter bar and select Add Query. I sleect 'Use SQL Statements'I select 'Update' (or 'Delete')I get a sql statement pane containing the word 'Update' ('Delete') and asking 'What data should the table load?'I can click on next, but anything else gives me errors. I'd list them, but I'm clearly doing something wrong and it's probably obvious. Diane
I'm need to use typed Dataset with CLR UDT, but when I'm trying to create TableAdapter in Dataset designer, I'm gettng error message: User-defined data types are not supported in DataSet designer
with the help of the following code am able to read the text file now i need to insert values to the datatable in dataset can anybody help me on this regard
how shall i spilt them and add each value to two fields of the datatable
for example i have the fields in text file as Username1:Password1 Username2:Password2 etc i need to add the username seperatelt to a field called username in table and password in password field of the datatable an example with code would be better and helpful
I created a report using RS with a SQL stored procedure (with date range parameters and a cursor to build the data) as the data source. When I execute the proc in SQL it returns over 300 records. When i go the the data tab on my report view the data, the proc and the preview only returns the first row. What am i doing wrong? I am new to RS.
I want to display the total no. of Addition, Removals and Relocations during the past 3 months in a paticular Area.
I have written the query for this.
select q.[areaname] as Area,
classCount as TotalCount, ReqType
from ( select a.areano,
a.classCount, ReqType
from ( select areano,
count(*) as classCount, reqdtls as ReqType
from WebSummit
join RequestType
on WebSummit.reqid = RequestType.reqid
where date_created >= dateadd(mm, -3, getdate())
group by areano, reqdtls
) a
join WebSummit b
on a.areano = b.areano
group by a.areano,
a.classCount, ReqType
) p
join Area q
on p.areano = q.areano
The query works fine and has been tested. Now I want to display this in chart format.
The display should be in a chart format, one for each area showing a bar for each RequestType.
I have placed "TotalCount" in the Data Fields section and ReqType in Category fields. How do I use the Filter to set an expression so that it displays the data in a seperate chart for each Area.
I tried using =Fields!Area.Value and set it to Area1 to display only Area1 values, however the preview shows nothing.
hi, i am having 2 columns in a table in a dataset. i want to add those two columns and bind the resultant total as a single column to the datagrid. is it possible. if yes, how o acheive this? please help me. thanks in advance. muppidi.
I'm retreiving data from a SAP BW data source. In the dataset designer I can build a query that returns a single value, the data returns successfully in the designer. When I switch to the layout mode I can place the field of the datset in table / matrix / textbox. However when i switch to preview mode or deploy the report and try to see them in Report Manager the report fails to render with the following message:
Query Execution Failed for dataset 'XXX'
These columns don't currently have unique values.
Its a single cell datset?!?!
I can successfully retreive data from other SAP Infocubes and queries. I also cannot replicate the error using a SQL Server datasource. The stack trace error looks like this:
w3wp!processing!6!5/9/2007-16:57:41:: e ERROR: Throwing Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: Query execution failed for data set 'DataSet1'., ; Info: Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: Query execution failed for data set 'DataSet1'. ---> System.ArgumentException: These columns don't currently have unique values. at System.Data.ConstraintCollection.AddUniqueConstraint(UniqueConstraint constraint) at System.Data.ConstraintCollection.Add(Constraint constraint, Boolean addUniqueWhenAddingForeign) at System.Data.DataTable.set_PrimaryKey(DataColumn[] value) at Microsoft.ReportingServices.XmlaClient.CubeMetadataCache.CreatePrimaryKeys(DataTable table, InternalObjectType objectType) at Microsoft.ReportingServices.XmlaClient.CubeMetadataCache.Populate(InternalObjectType objectType) at Microsoft.ReportingServices.XmlaClient.CubeMetadataCache.Microsoft.ReportingServices.XmlaClient.IMetadataCache.Populate(InternalObjectType objectType) at Microsoft.ReportingServices.XmlaClient.ObjectMetadataCache.Microsoft.ReportingServices.XmlaClient.IObjectCache.Populate() at Microsoft.ReportingServices.XmlaClient.CacheBasedFilteredCollection.PopulateCollection() at Microsoft.ReportingServices.XmlaClient.DimensionPropertyCollectionInternal.Find(String index) at Microsoft.ReportingServices.XmlaClient.DimensionPropertyCollection.Find(String index) at Microsoft.ReportingServices.DataExtensions.SapBw.DataReader.FindOptionalPropertyName(String internalColumnName, CubeDef cube, Boolean fIsYukonSP1) at Microsoft.ReportingServices.DataExtensions.SapBw.DataReader.GenerateColumnInformation(CubeDef cube, Boolean fIsYukonSP1) at Microsoft.ReportingServices.DataExtensions.SapBw.DataReader..ctor(AdomdDataReader dataReader, CubeDef cube) at Microsoft.ReportingServices.DataExtensions.SapBw.SapBwCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RuntimeDataSetNode.RunDataSetQuery()
Any ideas why this happening and how I can get around it?
Thanks
Sanjay
ps Why would you want to put a unique constraint on a read only single table dataset?
I want to design a report in which it will contain fields derived from 2 different stored procedures. I understand a 'table' can display data from a single dataset. How can i bind these two stored procedures into a single dataset so as when i click on the table and use its property 'DataSetName', to be able to select the dataset which holds all columns from stored proc 1 and stored proc 2. How can i link multible tables ( multible stored procedures with different column names in each one) into a single dataset to feed the report?
I'm looking to build a report that is basically a series of line charts that is plotting a value over time. I can accomplish this one chart/dataset at a time, but I believe with 'List's this can be achieved in a more automated fashion.If I have some data similar to this:
I want the charts grouped by the Area_ID, and then each Location_Name is a Series in that chart. So in this example, I would end up with 2 charts (Areas 1 & 2), each have 2 series (Area 1: Site1, Site2 and Area 2: Site3, Site4)Is it possible to build this with a list? or do I need to structure the data differently?
I have an issue in generating the report in sql reporting services. I need to display a report in a table format. The datas of the table should be from two different sql tables. I have tried to write a stored procedure that returns two result sets from two different tables. As reporting services takes datas only from the first result set, i tried to write two different stored procedures each displays one result set. Then i have created two datasets with that two different stored procedure. Even then i cannot proceed as i was not able to use two different dataset in a single table because i was setting the datasetname to one dataset, when i try to retrieve the fields from another dataset i was able to retrieve only first and count values. Then i tried using sub reports. As sub reports for a dataregion(table) repeats for every row of the main report i was not able to fetch the correct datas. Atlast i have tried combining the query using join and wrote a single stored procedure. This stored procedure returns a single result set retrieves data from two tables satisfying the conditions. The issue i am facing with this is, the first table has only one row satisfying the condition and the second table has three rows satisfying the same condition, as i am using join query for the three rows returned by the second table the first table datas are getting duplicated for the rest of the rows in the second table. As I found using join query is the only resolution for the output which I need, and also I have to avoid the duplication of the records. Hence let me know for any solutions.
I have shown the sample datas that is duplicating which is indicated as bold. Phonenumber, Attemptdate and calloutcome are from first table and start time and endtime is from second table. As there are three different datas for the second table, first table datas are duplicated
What is the most efficient standalone .NET class that can hold a single disconnected record? The class must also retain column names, but other schema is not relevant (.NET data type is sufficient).If I understand System.Data.Common.DbDataRecord, it provides an interface on a DbDataReader, and has no storage of its own.I'm familiar with DataSet, is that the only .NET-standard class to do this? Thank you,Shannon
First I want to say thanks to the folks how have helped me over the past week or two. I'm missing a crucial piece of insight. How do I read a single piece of data from a SqlDataSource which only hold one row of data into a declared variable? string zUserName = SqlDataSource.(get the value in the row that is labeled UserName) It really doesn't matter to me whether it is an SqlDataSource or some other data container that hold the data I've selected. My goal is to be able to read some data from some predefined datasource into a declared variable. If I am approaching this problem in the wrong way any advice or article links you could give me would be grealy appreciate. Thanks, Bill
My application supports a single database connection and in the app console I can produce reports. If I include the app database in an AlwaysOn availability group with a read-intent replica will SQL automatically route the “selects” to that second instance thus offloading my application’s reporting activities or I need a separate db connection (maybe from a reporting app or cli) with a connection specifying read-only intent?
I dragged two tables into the dataset designer. And I have a query with a resultset over both of the tables (joined).Is there ANY way I can have a strongly typed datatable out of the resultset?The automatically created dataset adapters won't allow me to create a tableadapter or datatable for the joined resultset but for one single table at a time only.Any solution to that? Theoretically it should be possible since I don't "lose" any type information with a join.. why can't I have a strongly typed datatable over the resultset?The join is not very sophisticated. In fact it couldn't be any more simple.(I'm refering to my previously posted question at http://forums.asp.net/t/1220481.aspx)
I'm looking to serialize some NVP data into an XML blob. I plan to put a primary xml index on the column, but my question is, would putting an XSD on the column speed up any queries, or would it just ensure format? I know that with selective xml indices, you can do things like specify the datatype associated with the xpath which can further optimize retrieval.
I would like to ask if there will be a write and concurrency issue if i would create an online application with just one user connecting to the database, just like most open source php/mysql that can be downloaded
i.e Setup 1. I will grant a single user that will connect to a database and will be set to a config.inc.php file and then create a table users (userid, username, password) and this table will be used for the application authentication and access control.
Setup 2. or is it much better to grant users that will connect to the database and have the table users for access control of the application?
to further illustrate my query:
Setup 1 would be: ###################Table: Users user a@ipadd --> db1 --> userid mary --> myOnlineApp user a@ipadd --> db1 --> userid john --> myOnlineApp user a@ipadd --> db1 --> userid paul --> myOnlineApp
and Setup 2 would be: #####################Table: Users user mary@ipadd --> db1 --> userid mary --> myOnlineApp user john@ipadd --> db1 --> userid john --> myOnlineApp user paul@ipadd --> db1 --> userid paul --> myOnlineApp
will Setup 1 be enough if I will use SQL Server as database?
or Setup 2 is better user/database architecture?
This application will be online enrollment for a school with 16,000 students
very much appreciated for the feedbacks and suggestions
I'm taking a database(read-only) backup from one server and restoring it on other server. As soon as restore is done it is bringing database into single-user read-only mode.
why it is bringing the database into single user mode ?
I've been writing this stuff for a while, and can't seem to come to the conclusion of how I should be retrieving data and assigning this data to variables.
Since i'm using SQL Server, I'm convinced that I should be using the datareaders GetSqlDouble (or whatever) function, but this would mean i need my local variables to be one of the SQL types. The problem with that is, that there will have to be lots of conversions done by me to be able to use a SQL type in my application.
For instance, I have a class where i'm retrieving dates. In order to retrieve them correctly (Null values included), I need to retrieve them with GetSqlDateTime(), then when it comes time to display the date in a table, i must first check for nulls, then convert to a string. This seems to be very cumbersome. Would I be better off just using GetDateTime(), and the .ToString method, and ignoring Sql Types all together?
so, basically, how are you guys using your sql server data? with the supplied sql types, and doing all of the post-processing work manually? I feel like i'm having trouble conveying my issue...hopefully someone knows what i mean....i'd just like some direction to save trouble in the long run, since i feel like there's got to be a better way...
I have a report with multiple datasets, the first of which pulls in data based on user entered parameters (sales date range and property use codes). Dataset1 pulls property id's and other sales data from a table (2014_COST) based on the user's parameters. I have set up another table (AUDITS) that I would like to use in dataset6. This table has 3 columns (Property ID's, Sales Price and Sales Date). I would like for dataset6 to pull the Property ID's that are NOT contained in the results from dataset1. In other words, I'd like the results of dataset6 to show me the property id's that are contained in the AUDITS table but which are not being pulled into dataset1. Both tables are in the same database.
I have a small number of rows in a dataset, Table 1. There is a CLOB on a large dataset, Table 2. They join on a PK. I would like to retrieve this CLOB and add it to the data flow for Table1. In short I want to emulate the following:
Table 1: Small table without CLOB, 10 rows. Table 2: Large table with CLOB, 10,000,000 rows
select CLOB from table2 where pk = (select pk from table1)
I want this to return the CLOBs for the small number of rows in Table 1. The PK is indexed obviously so it should be a fast look up.
Table 1 and Table 2 live on different Oracle databases. How do I perform this operation efficiently in SSIS? It seems the Lookup and Merge Join wont do this.
I have a report with multiple datasets, the first of which pulls in data based on user entered parameters (sales date range and property use codes). Dataset1 pulls property id's and other sales data from a table (2014_COST) based on the user's parameters.
I have set up another table (AUDITS) that I would like to use in dataset6. This table has 3 columns (Property ID's, Sales Price and Sales Date). I would like for dataset6 to pull the Property ID's that are NOT contained in the results from dataset1. In other words, I'd like the results of dataset6 to show me the property id's that are contained in the AUDITS table but which are not being pulled into dataset1. Both tables are in the same database.
I found out the data I need for my SQL Report is already defined in a dynamic dataset on another web service. Is there a way to use web services to call another web service to get the dataset I need to generate a report? Examples would help if you have any, thanks for looking
Im exporting an ms-excel file, then I use a lookup transformation to get a field from a SQL Server 2005 table. The Lookup transformation editor, after selecting the table, shows a warning that says:
at least one mapping between a column from available input columns ans a column from available lookup columns must be defined on the columns page.
So I try to make a relationship in the Lookup transformation editor's column tab where I find the Available input columns and the available lookup columns but I get the following error:
The following columns cannot be mapped: [Department, DEP_CLEGALCODE] One or more columns do not have supported data types, or their data types do not match.
The field in SLQ Server is varchar(10) and the input field is a derived column transformation; I have tried different Data Types but I always have the same error.
The DataFlow is: ExcelSource --> Derived Column --> Lookup --> Flat file destination
Hi, I have a stored procedure attached below. It returns 2 rows in the SQL Management studio when I execute MyStorProc 0,28. But in my program which uses ADOHelper, it returns a dataset with tables.count=0. if I comment out the line --If @Status = 0 then it returns the rows. Obviously it does not stop in if @Status=0 even if I pass @status=0. What am I doing wrong? Any help is appreciated.
ALTER PROCEDURE [dbo].[MyStorProc]
(
@Status smallint,
@RowCount int = NULL,
@FacilityId numeric(10,0) = NULL,
@QueueID numeric (10,0)= NULL,
@VendorId numeric(10, 0) = NULL
)
AS
SET NOCOUNT ON
SET CONCAT_NULL_YIELDS_NULL OFF
If @Status = 0
BEGIN
SELECT ...... END If @Status = 1 BEGIN SELECT...... END
I'm trying to do Sharepoint DR with Log Shipping and every thing configured except one thing which is switch the WSS_Content (Standby /Read-Only) DB to be ready and Write.
I tried from
GUI or ALTER DATABASE [WSS_Content] SET READ_WRITE WITH NO_WAIT
I have two database files, one .mdf and one .ndf. The creator of these files has marked them readonly. I want to "attach" these files to a new database, but cannot do so because they are read-only. I get this message:
Server: Msg 3415, Level 16, State 2, Line 1 Database 'TestSprintLD2' is read-only or has read-only files and must be made writable before it can be upgraded.
What command(s) are needed to make these files read_write?
OBJECTIVE: I would like to read a text file from SQL Server 2000, read the text file content, and load its conntents in a RichTextBoxTHINGS I'VE DONE AND HAVE WORKING:1) I've successfully load a text file (ex: textFile.txt) in sql server database table column (with datatype Image) 2) I've also able to load the file using a Handler as below: using System;using System.Web;using System.Data.SqlClient;public class HandlerImage : IHttpHandler {string connectionString;public void ProcessRequest (HttpContext context) {connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["NWS_ScheduleSQL2000"].ConnectionString;int ImageID = Convert.ToInt32(context.Request.QueryString["id"]);SqlConnection myConnection = new SqlConnection(connectionString);string Command = "SELECT [Image], Image_Type FROM Images WHERE Image_Id=@Image_Id";SqlCommand cmd = new SqlCommand(Command, myConnection);cmd.Parameters.Add("@Image_Id", System.Data.SqlDbType.Int).Value = ImageID;SqlDataReader dr;myConnection.Open(); cmd.Prepare(); dr = cmd.ExecuteReader();if (dr.Read()){ //WRITE IMAGE TO THE BROWSERcontext.Response.ContentType = dr["Image_Type"].ToString();context.Response.BinaryWrite((byte[])dr["Image"]);}myConnection.Close();}public bool IsReusable {get {return false;}}}'>'> <a href='<%# "HandlerDocument.ashx?id=" + Eval("Doc_ID") %>'>File </a>- Click on this link, I'll be able to download or view the file WHAT I WANT TO DO, BUT HAVE PROBLEM:- I would like to be able to read CONTENT of this file and load it in a string as belowStreamReader SR = new StreamReader()SR = File.Open("File.txt");String contentText = SR.Readline();txtBox.text = contentText;BUT THIS ONLY WORK FOR files in the server.I would like to be able to read FILE CONTENTS from SQL Server.PLEASE HELP. I really appreciate it.
