DB/Reporting :: .Net/Oracle Application Best Design When Building Sql Command Parameters
Oct 2, 2009
Currently working on a web-service with Oracle10g as back-end. Here is my problem.
1. The table I need to populate has 100 columns. I have no control over the design of the table.
2. I wanted to use the "deriveparameters" method of OracleCommandBuilder, but found out that this is "costly" in terms of performance. What I initially planned to do was to derive the parameters from an open connection, close the connection, then maybe cache the parameters obtained but I don't know if this is possible.
I am unsure how big of a hit the performance will get if I continue using the "deriveparameters" method WITHOUT caching the parameters driven. The environment is as follows
-intranet
-around 2000 users
-users spread out in different parts of the country
I am not familiar where they will put the web pages of the application, the web service and the database. I don't know if they'll be putting it in different servers or on one server, but that's something we cannot control too, that's why I am looking for the best approach.
I just don't want to hard-code all that parameters and if, for instance, we need to change some properties/parameters, it will be a pain to maintain the code. It would be nice if someone here can point a way to automate the whole thing w/o the performance of the system taking a hit.
I'm connecting succesfully to an Oracle 10g DB with an the Microsoft ODBC for Oracle driver.Regular queries without parameters work fine, but parameterized queries act as if the parameters aren't getting passed in.ex.
--this works fine
Select * from tbl1 where column1 = 'test'
--this doesn't
select * from tbl1 where column1 = ? --odbc string parameter 'test'
I have a search function de build.We are using pure ASP.NET w VB.NET We have multiple DropDownLists and we're building a search query with whatever was selected in those DDLs. My question is, how can I handle the blank values (unselected dropdownlist values) with the SQL Query ? I'm using AND operators in the query so if anything is blank it'll fail the search. If the dropdownlist has no selected value, i don't want the value to be part of the search. It would be easy to code with just 2-3 parameters, but we're looking thru at least 10 items and doing a SWITCH CASE or multiple IFs would soon become mayhem.
I will try and explain my problem as simply as I can
I have an Oracle database (external app) that contains a number of tables that I need to get data from, however I also have an SQL database that contains a number of tables that my app is using.
e.g. Oracle Table name PD_112
Structure:
CODE:
What I want to do is get all the data from the Oracle table to display in a list control however I want the values in the DISP_ID column of the Oracle table to be change to the corrosponding DESC values from the DispTbl e.g. 5 from the Oracle table would display Piping instead of 5.
I know how to do this if both the tables where in one database system e.g. Oracle or SQL, however I am not sure the best why to do this when the tables are in 2 different data sources.
Below is the code for doing this in the same datasource:
I have an Oracle database (external app) that contains a number of tables that I need to get data from, however I also have an SQL database that contains a number of tables that my app is using.
With a 1-many relation. Ok, I have constructed the schema, and now I want to make the appropriate forms in which a user would scroll for a customer and then by pressing a button, a new form would appear showing all the orders that he has made.
I am interested in the way of building two forms that would have a one to many relation. That is basically what I would like to know. Also, Do you have any good book to suggest in order to create a real world app, in VB2008, Emphasizing in data-binding and connecting controls with underlying DB, one to many forms, searching etc.
Im writing a simple VB program that connects to an oracle DB which retreives and inserts data to a table I created.[code].....
I want to be able to search through a table I have created to store all the information.Rather than just searching for one variable which would be easy to do, I want to give the user the option to filter out the search from the form.So say the user hits "Find", they would be given access to 10 comboboxes, they would select the information they want to search for (They do not have to select every box) and then click "Do Find".Then the form would display all the results of the query in the form.
I have the following code in a VB .NET application. I am trying to update columns in an Oracle table with data with SQL data. When I run the application, I get (ORA-00933: SQL command not properly ended) for the 'or_cmd_3.ExecuteNonQuery()' line.
If I strip out the code and run it in TOAD or SQL Developer, replacing the temp varialve with some bogus data it updates fine. What am I missing?
ElseIf (oracle_summary_temp = ueio_tmpALM_Summary) And (oracle_request_ID_temp = ueio_tmpALM_ID) And added_to_alm = "1" AndAlso ({"Deferred", "Rejected", "Closed"}.Contains(ueio_tmpALM_Status)) Then Dim update_oracle As String = Nothing
I'm developing a form with usercontrols which have to be edited during disign.The project has a connectionstring in de my.settings.The usercontrol has a property which is also called connectionstring.Now, I want to pass the project connectionstring to the usercontrol connectionstring, when the usercontrol is dragged to a form. (All during design)
I have a stored procedure on an oracle database called : GET_HVE_PACKAGE_VERSIONS This basically calls versions of PLSQL packages as stores the versions into a table. I am having big problems trying to call this procedure. I have tried everything. I am currently able to create and update etc etc using the executeNonQuery method and I thought that I would be able to call a procedure them same way, obviously not
the whole project depends on me being able to call procedures against the database.
I have a copy Oracle 11g which is now fully installed. Will it work with Visual Basic Express 2008 or just Visual Studio 2008 Professional? I have both Visual Basic Express 2008 and Visual Studio 2008 Professional. I really would like to know if it works with Visual Basic Express 2008.
I recently upgraded my system to Windows 7 64bit and ever since then I have had nothing but issues with my code attempting to access an Oracle database. I was using msdaora for my connection string however that does not work in 64bit. I changed over to OraOLEDB.Oracle which everything I can find on Google says to use however it fails every time. I have installed Oracle 11g 2 times now and even tried reinstalling VB.net 2010 and still no luck.
I am designing a system for our sales team to enter their sales expenses. I have designed an input form and need some advise on what exactly I should store in the expenses table VS lookup from the employee table.
First, the form has a text box where the user must enter their EmployeeID. Management asked for a text box VS a combo box because they do not want users looking at each others expenses. The form has a search feature where by after you enter your employee number, it will look for an existing expense ticket first before allowing you to create a new one. Anyway, here are some of the decisions I have to make.
When the user enters their employee number, I would like to display their employee name. The EmployeeID is saved in the Expense table but should I also store the name in the expsense table? If I do save it, it's duplication of data, if I do not, I have to look it up each time the record is loaded. But is there a point storing the name long term? Does this qualify as related data? If I was to perform some reporting, could this cause a problem if an employee changes their name etc.
The expense data is spread over 2 tables, the first for the header details including employeeID, expense date and Expense ID etc. The second table contains the expense lines information. Amount, customer, category etc. My next question is when the employee chooses an expense category, there is an associated general Ledger code with that category. Again, the expense category data is stored in a table. When the user chooses the expense category, should I store the categoryID or store the values associated with the ID (GLAcct, CategoryDescription etc.) Does this qualify as related data or should lookup values always be duplicated in the master table? It is possible that over time, the GL accounts associated with the Expense categories could change. So for accuracy purposes, should they be stored in the expense lines table?
I have been working on this all day and still haven't had any luck at getting it to work. I am using the SqlDataReader Object to retrieve data. I am using the code below to send a value to the stored procedure.The problem is that the value is sent enclosed in quotes so I dont get any data back. I have tried using .text.replace("""","")
I have a connection to a MS SQL database, which I understand is capable of handling multiple SQL statements in one Execution, ie
Code: Using cmdExe As New System.Data.SqlClient.SqlCommand sSQL = "Delete * from mytable where UniqueID=123;Insert into mytable (UniqueID, Field) values (123, 'something')" cmdExe.CommandText = strSingleSQLLine cmdExe.ExecuteNonQuery() End Using
will delete from "mytable" and insert a new record all at once. This is great, but I want to expand upon that to use parameters because using string concatenation in my SQL queries is a bad idea. Now my question is this. If I add a parameter which is used in multiple SQL statements, do I have to add the parameter VALUE twice to the command object? ie, will the following code work?
Code: Using cmdExe As New System.Data.SqlClient.SqlCommand sSQL = "Delete * from mytable where UniqueID=@uniqueID;Insert into mytable (UniqueID, Field) values (@uniqueID, 'something')" cmdExe.Parameters.AddWithValue("@uniqueID", 123)
[code]....
There are two questions here actually...can I add the parameters before setting the command text, and do I have to add the same parameter over and over again?
i am running a dos command. now i created checkboxes to add parameters to the command. [code] but it only gives me a 1 or 0 but i want the parameter -h, -t, -v when the checkbox is checeked.
I am passing some comma separated parameters to console Application. I want to split those string for that I have written below script but it is giving error .
I am trying to setup a variable in VB, which will execute a shell command (autostatus.exe) with a parameter (-j JobName), and later display the output of the said variable. The code thus far is...
Dim JobName Dim JobStatus JobName = "asysr11_set_global_var_2day" JobStatus = ShellExecute("autostatus.exe", -j, JobName)
What is the easiest way to achieve this? Currently, the above code returns error message "line:4, Type mismatch: 'ShellExecute', code: 800A000D"
I'm getting this error, Update error: No value given for one or more required parameters, which seems to indicate a variable is not making it to Access or is empty. My procedure is meant to update a product record in the database.
Code: Private Sub btnChange_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnChange.Click Dim cmdOrderEntry As OleDb.OleDbCommand Dim strSQL As String
Am using VB.net 2005, and I've created columns for the datagridview at design time. But when I run the code the fill method of the DataAdapter, the columns I created are not filled with data, but automatically generated columns appear. How can the columns I created at design time be filled with data?
In a program I am creating, i want to let the user add and remove fields on an entity, lets say "people". So I have a table named "People", with ID and Name columns. Now, I want to let the user choose "add field" in a webpage, define for instance "email" field, and then use "ALTER TABLE" from the codebehind to create the new field in the table. What I want to know is: is this recommended? It seems like a simple way to do this, but since I have never seen any other programs doing it like this (Using ALTER TABLE statements from codebehind in a live environment) - and since it changes the design of the DB -
