Creating A Common ADO Class For Database Access
Mar 28, 2007
I have been using the .NET Enterprise Library for DataAccess patterns for some time now. I'm going back to a bunch of old legacy ADO code written in VB6/VB5 and would like to try and create the same "centralized" class that all of my code can instantiate and call to open database objects, call stored procedures, etc.
Does anyone know of any samples of papers which might describe this?
Thanks very much,
...Andrew
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Mar 13, 2007
Hi
I am trying to create an access database (vb 2005). The code sample below works fine if I create the database without specifying a username and password (values left blank). However if these are specified an exception is thrown. Any help/suggestions would be appreciated.
Try
Dim cat As Catalog = New Catalog()
cat.Create("Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=C:Seans VBAppGeneratorSystemAppGen.mdb;" & _
"Jet OLEDB:Engine Type=5;" & _
"User Id=user;" & _
"Password=pass;")
Console.WriteLine("Database Created Successfully")
cat = Nothing
Catch ex As Exception
Console.WriteLine("Failed to create database")
End Try
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Mar 17, 2008
Hi,
How do I create a user that has full access to a database using only SQL statements?
I've create very basic database called "sampledb".
Then I've done:
CREATE LOGIN sampleuser WITH PASSWORD = '123sampleuser', DEFAULT_DATABASE = sampledb;
USE sampledb;
CREATE sampleuser FOR LOGIN sampleuser WITH DEFAULT_SCHEMA = 'db_owner';
Then I logon to SQL server express 2005 management studio using this user, first of all I do not see the sampledb database listed under "databases" even though it is selected in the "available databases" toolbar (how do I list it there? Because going through "attach..." tells me I do not have the privileges to browse for the database to attach).
I then open up a new query (sampledb is selected), and type (products is one of the table in sampledb):
select * from products;
And I get:
Msg 229, Level 14, State 5, Line 1
The SELECT permission was denied on the object 'Products', database 'sampledb', schema 'dbo'.
Shouldn't the chosen schema (db_owner) give me the right to do this? And how do I fix this from the query window (without going through the GUI, just using SQL statements)? And how do I list sampledb under the databases when I log in as this user?
Thank you!
-Yannick
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Sep 10, 2014
We are running SQL Server 2012 on Windows 2008 Server. In one database, we would like to create a view which access objects in another database without giving the user permissions to the underlying base tables in the other database. The ownership chain is broken in this case. Can this be accomplished (considering the ownership chain is broken)? If so, what is the easiest method to accomplish this task? Or
Example 1 (Works):
In DB1:
--UserA selects from Schema1.View1 (which access tables in DB2).
In DB2:
--UserA exists with select permissions on the base tables accessed by Schema1.View1 (in DB1).
Example 2 (trying to accomplish):
In DB1:
--UserA selects from Schema1.View1 (which access tables in DB2).
In DB2:
--UserA exists (or may not exists) with NO permissions on the base tables accessed by Schema1.View1 (in DB1).
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Jan 2, 2007
Hi,
for some reasons, I have to get access to the TaskHost during validation and execution. For example, I wanna know, if my task is within a container or not (parent is Sequence).
For the UI during design time, there is the TaskHost parameter. What about the execution time or during validation?
Any hints?
Thanks.
Thorsten
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Feb 2, 2007
Hi, I'm using Reporting Services on my website and for some reports, i get the timeout error after 30 secs.
I declared my object using the Reporting tools and I am using ObjectDataSource.
My report is declared in my aspx page:
<rsweb:reportviewer id="ReportViewer1" runat="server" font-names="Verdana" font-size="8pt" Width="100%" Height="600px">
My ObjectDataSource is declared in my aspx page under my report tag:
<asp:ObjectDataSource ID="ObjectDataSource" runat="server" OldValuesParameterFormatString="original_{0}" SelectMethod="GetData" TypeName="ReportsTableAdapters.ViewingTotalsTableAdapter">
My TableAdapter is declare in my Reports.xsd file:
<TableAdapter BaseClass="System.ComponentModel.Component" DataAccessorModifier="AutoLayout, AnsiClass, Class, Public" DataAccessorName="ViewingTotalsTableAdapter" GeneratorDataComponentClassName="ViewingTotalsTableAdapter" Name="ViewingTotals" UserDataComponentName="ViewingTotalsTableAdapter">
I am trying to access the TableAdapter object from my WebPage Class on the Page_Load event , so I can modify the Command.CommandTimeout. Unfortunately, I cannot find a way to have access to the TableAdater object.
Anyone has any suggestion ?
Thanks,
Richard
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Nov 16, 2007
I'm trying to use the Data Access Application block, and am having some issues with configuration. I am using it in a class library, and it seems that with v 3 you need to configure the DAAB first, making changes to the configuration file. However, in a class library, I do not seem to have the web.config or app.config file to change. So where do I need to store the configuration settings?
Thanks,
Paul
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Jul 23, 2005
Using SQL against a DB2 table the 'with' key word is used todynamically create a temporary table with an SQL statement that isretained for the duration of that SQL statement.What is the equivalent to the SQL 'with' using TSQL? If there is notone, what is the TSQL solution to creating a temporary table that isassociated with an SQL statement? Examples would be appreciated.Thank you!!
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Feb 21, 2008
Hai Guys,
I have a doubt Regarding SqlDataReader
i can able to create object to Sqlconnection,Sqlcomand etc...
but i am unable to create object for SqlDataReader ?
Logically i understand that SqldataReader a way of reading a forward-only stream of rows from a SQL Server database. This class cannot be inherited.
sqlDatareader belongs to which class is it sealed or static class?
can we create own class like SqldataReader .......
Reply Me ...... if any one know the answer..............
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Feb 1, 2008
Does any one inherit SqlDatasource class?
I treid it as :
public class MYDataSource : System.Web.UI.WebControls.SqlDataSource
{public MYDataSource(){
}
}
Debugger dont give any error or warning when i buld project. But when i use it in a page Visual studio is crashed.
Can any one help me ?
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May 19, 2006
I had just installed SQL 2005 dev on my laptop and got an error message when I tried to create a package using the BI IDE. I received the same error using VS2005 IDE. But the project was created regardless without any packages. When I tried to create a new package in the project, I received the same error again, but with an option to view the error details.
Following is the text of the error details:
TITLE: Microsoft Visual Studio
------------------------------
Error creating package
------------------------------
ADDITIONAL INFORMATION:
Failed to save package file "C:Documents and SettingsmyoungbloodLocal SettingsTemp mpD4B.tmp" with error 0x80040154 "Class not registered".
------------------------------
Failed to save package file "C:Documents and SettingsmyoungbloodLocal SettingsTemp mpD4B.tmp" with error 0x80040154 "Class not registered".
------------------------------
BUTTONS:
OK
------------------------------
I found a similar post that suggested that they try the following:
regsvr32 msxml3.dll
regsvr32 msxml4.dll
regsvr32 msxml6.dll
But msxml6.dll could not be found.
I did get a copy of this file from a coworker, and after copying it and registering it, I was able to add a package to the project.
My concern now is what is the likelyhood of this being the only file missing from the installation.
I'm wondering if I should reinstall, or (if it exists) do a repair on the installation.
Thanks.
Marshall
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Apr 20, 2007
I am using the 3-tiered architecture design (presentation, business laws, and data acess layers). I am stuck on how to send the image the user selects in the upload file control to the BLL and then to the DAL because the DAL does all the inserts into the database. I would like to be able to check the file type in the BLL to make sure the file being uploaded is indeed a picture. Is there a way I can send the location of the file to the BLL, check the filetype, then upload the file and have the DAL insert the image into the database? I have seen examples where people use streams to upload the file directly from their presentation layer, but I would like to keep everything seperated in the three classes if possible. I also wasn't sure what variable type the image would be in the function in the BLL that receive the image from the PL. If there are any examples or tips anyone can give me that would be appreciated.
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Jan 28, 2008
Hello,
I would like to deploy a per-machine Express database as part of my VS2005 C# desktop application. The deployment must work with both XP and Vista from the same setup files. I'm not using One-Click installation. I don't want my users to have to configure Express with the Surface Area Configuration tool.
Since the database cannot go in C:Program Files because of Vista ACL issues, I am using COMMONAPPDATACompanyNameAppName as the install path for the database and other user writable application files. In XP this expands to C:Documents and SettingsAll UsersApplication DataCompanyNameAppName and in Vista it is C:ProgramDataCompanyNameAppName. Neither of these paths have write privileges for unprivileged users, so the install program needs to change the write permissions at install time. Right now I am using SetACL ( http://setacl.sourceforge.net/ ), to do that and the install goes fine with write permissions on the companyName folder and it's children for all users.
But I can't connect to the mdf file in my COMMONAPPDATACompanyNameAppName folder. If I am the administrator/installer it works fine, but as an unprivileged user I get different errors, but mostly "Could not login user ...". For debugging, I have also tried installing the database in the "AppFolder" directory (which for my app in both Vista and XP is C:Program FilesCompanyNameAppName) and using "User Instance=true" in the connection string, and the connection is made but (at least on XP) the unprivileged user cannot write to the database because the folder lacks write privileges for that user.
I suppose one thing I could do would be to change the folder/file permissions in the AppFolder, but I am reluctant to do that because I have read that Microsoft does not guarantee that the "Compatibility" feature in Vista for the Program Files directory will be available in future releases/service packs.
So is there a way to do a simple installation/db connection for a per-machine database located in a COMMONAPPDATA path?
Thanks for your help.
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Nov 13, 2007
I have a C# application, and I need to store instances of various class objects in a database. For Example:
myClass oMyClass = new myClass(args);
oMyClass.Property1 = something;
oMyClass.Property2 = something;
Now I need to store the oMyClass object in the database for later use, at which point I would get it out of the database, cast it back to myClass, and be able to acess its properties, etc. My problem is that the classes that I am working with are not serializable, so I cannot store the objects as XML. Does anyone have an example of doing this programmatically with C# and ADO.NET. I am assuming that I would have to store it in a vabinary column, but how do I get it in there. Any help would be greatly appreciated. Thanks.
Thomas
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Jul 16, 2015
Any tool, script, procedure, or otherwise that will solve this problem?
CREATE TABLE [Table 1] (
Id varchar,
TableTwoId varchar,
OtherData varchar )
CREATE TABLE [Table 2] (
Id varchar,
MoreData varchar )
What is the link between these two tables?
I have databases that have zero keys defined, no foreign key constraints, no unique value constraints. I cannot assume that an Identity column is the Id. The end game is be able to output that [Table 1].[TableTwoId] = [Table 2].[Id] but cannot assume that all linkage in the database will be as simple as saying "if the field name contains a table name + Id then it is the Id in that table."
Currently have written a script that will cycle through all columns and start identifying keys in singular tables based on the distinctness of the values in each column (i.e. Column1 is 99% distinct so is the unique value). It will also combine columns if the linkage is the combination of one or more columns from Table 1 = the same number of columns in Table 2. This takes a long time, and it somewhat unreliable as IDENTITY columns may seem to relate to one another when they don't.
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Jul 17, 2015
CREATE TABLE [Table 1] (
Id varchar,
TableTwoId varchar,
OtherData varchar )
CREATE TABLE [Table 2] (
Id varchar,
MoreData varchar )
What is the link between these two tables?
I have databases that have zero keys defined, no foreign key constraints, no unique value constraints. I cannot assume that an Identity column is the Id. The end game is be able to output that [Table 1].[TableTwoId] = [Table 2].[Id] but cannot assume that all linkage in the database will be as simple as saying "if the field name contains a table name + Id then it is the Id in that table."
Currently have written a script that will cycle through all columns and start identifying keys in singular tables based on the distinctness of the values in each column (i.e. Column1 is 99% distinct so is the unique value). It will also combine columns if the linkage is the combination of one or more columns from Table 1 = the same number of columns in Table 2. This takes a long time, and it somewhat unreliable as IDENTITY columns may seem to relate to one another when they don't.
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Jan 17, 2007
I have a SQL database table with all languages used in my application.
I would like to use an enum or constant class with all the languages, so every developer of the app sees directly what languages are available.
Can this be done?
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Aug 1, 2005
We recently upgraded our SQL Server 2000 to SP4 and are now getting the following error whenever we try to open up Site Diagrams.
An unexpected error happened during this operation. [MS Visual Database Tools] - Invalid class string.
This is very frustrating since I can't easily edit my database relationships or see my ER diagram.
Any ideas how to fix this?
Thanks
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Aug 15, 2006
Good Morning..
We're having a heck of a good time trying to implement our first CDE project in SSRS 2005.
In our SDE class library we have included an App.Config file where we want to store configuration settings..
Trouble is that when we view the configuration settings or connection string settings in debug mode, they're not being read for some reason..
Here's our app.config file:
-------------------------------------------------------------
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
</configSections>
<appSettings>
<add key="eventLogName" value="FocusDPEEventLog" />
</appSettings>
<connectionStrings>
<add name="PassConnString" connectionString="Data Source=SOMEDATASOURSE;Persist Security Info=True;User ID=SOMEUSERNAME;Password=SOMEPASSWORD;Unicode=True"
providerName="System.Data.OracleClient" />
</connectionStrings>
</configuration>
-------------------------------------------------------------
Here's what our Immediate window Debugger is tellin' us about our configuration settings:
-------------------------------------------------------------
ConfigurationManager.AppSettings
{System.Configuration.KeyValueInternalCollection}
[System.Configuration.KeyValueInternalCollection]: {System.Configuration.KeyValueInternalCollection}
base {System.Collections.Specialized.NameObjectCollectionBase}: {System.Configuration.KeyValueInternalCollection}
AllKeys: {Dimensions:[0]}<----incorrect should be 1
ConfigurationManager.ConnectionStrings
Count = 1 <----ok, is one, but the wrong 1, see 3 lines down...
base {System.Configuration.ConfigurationElementCollection}: Count = 1
ConfigurationManager.ConnectionStrings[0]
{data source=.SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true}<--Should be PassConnString
base {System.Configuration.ConfigurationElement}: {data source=.SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true}
ConnectionString: "data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true"
Name: "LocalSqlServer"
ProviderName: "System.Data.SqlClient"
Now notice the stuff in bold...I have NO IDEA where this gosh-danged thing is reading, but it doesn't seem like it's the app.config file in our class library...
thanks..
Doug
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Feb 1, 2007
Hi all,
I am using C# for ASP.NEt 2003.
I would like to know if there is any easy method to update a database with about 100 fields in it.
At present, I pass all the values of the controls on the web form to the stored procedure as parameters like :-
myCommand.Parameters.Add("@CustomerID", SqlDbType.Int).Value = txtCustomerID.text
Like this, I add all 100 parameters.
Is there any easy method to do it using a class or any other methods?
Thanking you in advance,
Tomy
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Feb 16, 2005
what is the best way to create a MS SQL 2000 database from an existing MS ACCESS 2003 database
with all datas in it ?
thank you
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Feb 25, 2004
I'm currently writing a web application in Coldfusion which uses a Access 2000 db. I can create tables in SQL ok but am having problems with the Autonumber type. Any ideas?
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Mar 1, 2006
I am trying to create a MS Access datasource to use it in a IS dataflow. I've done the following things:
1.I've created an ODBC datasource - System DSN, pointing to the Access database.
2.I've created an ODBC connection manager pointing to the ODBS datasource that I created in the previous step.
3.I've created a DataReader Source that uses as its Connection Manager the connection manager that I created in the previous step.
I get the following error message: "Cannot acquire a managed connection from the run-time connection manager." What can I do to solve this error?
Pedro Martins
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Aug 17, 2000
We have been asked to look into using stored procedures with SQL Server 7.0 as a way to speed up a clients site. 99% of all the articles I have read along with all the books all say Stored Procedure should be used whenever possible as opposed to putting the SQL in your ASP script. However one of my colleagues has been speaking to Microsoft and they said that that they were surprised that our client wanted to use Stored Procedures as this was the old method of database access and that now he should really consider using COM objects for data access as itis much faster. Has anyone got any views on this or know of any good aticles regarding this matter ?
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Mar 10, 2008
Hello, everybody.
In my web application, i'm using 2 tabels; Users(Username(PK), Pwd, Name, Deptid(FK)) n Dept(Deptid(PK), Deptname)).
For creating a Data Access Layer 4 my project, I added dataset as new item n followed the wizard 2 create the required functions.
I have a function GetUser(@uname, @pwd), which takes username n password as input. M using this for authentication purpose.
While executing it poping an ConstrainException.
Plz help me out.
I've tried 2 as clear as possible here. OR u may ask me any other questions for clear picture of the scenario.
Thanks and Regards,
Sankar.
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Jun 11, 2008
I request you plz tell how to create Data Access Layer. I mean DataAccess.dll. So that I can call stored procedure from dataaccess.dll as below.
DataAccess.SqlHelper.ExecuteDataset(DataAccess.DSN.Connection("DBConnectionString"), CommandType.StoredProcedure, "SP_GetEmpIds");
I request you how can I add this stored procedures to DataAccess.dll and function. I am not having any idea in this area. I request you plz give me some suggestions to work with task.
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Mar 5, 2006
a number of time I have come accross developers using functions like
GetProduct()
GetProductTitle()
GetProductCategory()
to get the value of the data instead of just using queries / stored procedures
I have not understood why
can you please point to some good forum messages / blogposts / articles on this ?
Whats your take on this ?
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Jan 13, 2004
I'm trying to create a linked server to an Access database that resides on a separate machine.
On my PC, I can create a link to the Access db, and view, update, add and delete data. If I create the same linked server on our production Server, I can again view, update, add and delete data. All's well so far.
If I now go back to my own PC (used for developing) I cannot access the linked server on the production machine.
The Access database is stored on a separate PC, so the I'm linking to a remote db. As I said this works fine if I'm sat in front of the PC that the linked server is created on - but not if I use a client PC to connect.
I create the linked server using the following command:
exec sp_addlinkedserver
@server = 'AccLinkedServer',
@provider = 'Microsoft.jet.OLEDB.4.0',
@srvproduct = 'OLE DB Provider for Jet',
@datasrc = '\DatabaseServerAccessDatabase.mdb'
If I run the SQL statement:
SELECT * FROM AccLinkedServer...AnyTableYouLike
I get this error:
Server: Msg 7399, Level 16, State 1, Line 1
OLE DB provider 'Microsoft.Jet.OLEDB.4.0' reported an error.
[OLE/DB provider returned message: The Microsoft Jet database engine cannot open the file '\DatabaseServerAccessDatabase.mdb'. It is already opened exclusively by another user, or you need permission to view its data.]
OLE DB error trace [OLE/DB Provider 'Microsoft.Jet.OLEDB.4.0' IDBInitialize::Initialize returned 0x80004005: ].
I've searched in the MS knowledge base, and this forum and followed all of the advice that was available, but it still won't work.
Anyone got any other advice, before I go totally insane with this.
Cheers.
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Mar 19, 2008
Hi!
This is quite weird.
When I first wanted to create assably using:CREATE ASSEMBLY hashfrom 'C:hash.dll'WITH PERMISSION_SET = EXTERNAL_ACCESS... Server returned error:CREATE ASSEMBLY failed because it could not open the physical file "C:TESTS_Run_This_In_SQL2.dll": 2(The system cannot find the file specified.).Then I tried to find file with exec Master.dbo.xp_fileexist 'C:hash.dll'File exists - falseFile is directory - falseParent directory exists - trueConclusion: Server knows that I have hard drive but cannot see the file (by the way file IS THERE 10000%,alright)
2nd TRY:Copy file to a Server PC named 'pluto' in a directory... i try to create an assably:CREATE ASSEMBLY hashfrom '\plutoProjektiECDLhash.dll'WITH PERMISSION_SET = EXTERNAL_ACCESS...SAME THING: The system cannot find the file specified.i try to find file.... SAME THING!
3rd TRY:I copy file to another Server PC, this time i try to find file first:exec Master.dbo.xp_fileexist '\Depoprojekti2ECDLSRCBackuphash.dll'IT WORKS!!! file is found!!! now everything should work....right!CREATE ASSEMBLY hashfrom '\Depoprojekti2ECDLSRCBackuphash.dll'WITH PERMISSION_SET = EXTERNAL_ACCESS.....CREATE ASSEMBLY failed because it could not open the physical file "\Depoprojekti2ECDLSRCBackuphash.dll": 5(Access is denied.).
Now this is fun.
The whole point of this is can somebody tell me what permissions I (or Management Studio or whatever) have to have in order to create an assably from dll?
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Sep 15, 2006
How do you create a link to MS Access DB in SQL Server 2005. Thanks
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Oct 26, 2000
Hi, Folks!
I'm receiving Access Violation Error when I'm trying to create a clustered index on a datetime field on a table that have around 4 million records, if I create the index nonclustered, no problem, but clustered the system raise this error!
Any help will be appreciate a lot!
Thanks in advance!
Armando Marrero
Cti. Miami
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Dec 10, 2007
Dear Readers,
Is it possible to create a query that access multiple sql express databases? Or is it possible to link a table in one database from another?
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Aug 3, 2006
I need to create graphs in access in a lick of a button all the data will be in the sql transfered from the access.
If anybody did this before ar having Idea please let me know
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