I saw that most of the time researching about database I notice that most people use ADODB in connecting to database. What my teacher use is that she uses ADODC in connecting to database.
I find it frustrating to search some examples about ADODC and how to use it because most people use ADODB.
Why do they prefer ADODB than ADODC?
What happen if they use ADODC than ADODB?
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Question says it all. I've done plenty of googling, but I can only find tooling for reading database queries into arrow tables, not the inverse. The closest thing I found was the TurboDC Project, which claimed in 2017 that
"Arrow support will be extended to cover the reverse direction of data flow, so that Python users can quickly insert Arrow tables into relational databases."
But as far as I can tell that hasn't happened. For our use case, we would be streaming arrow tables to a java service that would then write those tables to a database connection via JDBC.
Does anyone know of a tool or approach that we could use here?
I'm writing a C# Applications Solution v11.2 using eXpressApp Framework from DevExpress and the first thing I would like to do is make the 2 apps (web & win) connect to an Oracle Database without using the Oracle Client.
In my other projects I have used DevArt's dotConnect tool, which is great by the way (works without needing any Oracle Client installed).
I wonder if someone has tried this, 'cuz I just can't get it work. From what I read from the forums, I think that eXpress Framework doesn't recognize dotConnect's OracleConnection, or that I have to write my own XPO provider.. ?!
Please help!
Thanks!
One of the approaches to accomplishing this task is to create a custom XPO connection provider. This class will be a descendant of one of the standard connection providers listed in the Database Systems Supported by XPO help topic. I believe the following KB article should helps.
I need to develop a program that must delete and insert data into an Oracle database. Is it possible to use LINQ to SQL with Oracle?
For development I use MS SQL server but it will be a Oracle database in production. What do you recommend?
Officially No. Linq to SQL was originally build with the ability to swap out the data provider to allow connections to other databases, but they disabled this functionality in the released versions to encourage people to use more stable and supported data access layers (like EF). The recommended approach is to use Entity Framework if you want to switch between SQL and Oracle.
Also, Patrick is very right, make sure you are developing and testing against the same database platform you are going to use in production, there is a world of difference in how they operate. Sure, you should be able to abstract it away to not care about whether you are using SQL or Oracle, but that is almost never really the case.
No, you can't. Although LINQ to SQL was initialy designed with multi-database support in mind (you can see this when looking at the code using .NET Reflector) using a provider model, this model was never made public and Microsoft has no intensions in adding multi-database support to LINQ to SQL.
If you need multi-database support, please use Entity Framework.
No, LINQ-to-SQL doesn't support Oracle. Internally, the project had support for multiple back-ends, but this never made it into the final public release. I believe LINQ-to-Entities supports other databases.
As a predefined conditions I have multiple database sources to deal with.
Also I have a UDT – user defined types objects in part of this databases ( the UDT’s also have children inside) .
As a methodology I am a believer of using the ORM-object relational mapping to connect to DB’s .
In the past I’ve successfully implemented Fluent NHibernate library to connect to Oracle.
I’ve found a workaround for the Multiple Databases , even though the solution may be more elegant in future.
Nevertheless , I still can’t find a solution for mapping the UDT’s .
I think that it should be something like implementation of IUserType or ICompositeUserType .
If there is a known framework presenting option for a full ORM , including UDT’s handle it also can be a solution in our case.
I’ve checked out the EF of oracle (that is very premature) and also DevArt (that doesn’t handle UDT’s) as a possible solutions.
The ODP.Net is the only possible way right now and it’s not too friendly for the developers to use – no LINQ support , no context to begin with.
If you or any of your colleagues can help with some samples of the implementation of this kind of mapping it will be very appreciated.
I feel your pain, working with ODP.NET is not a pleasant experience at all. DevArt dotConnect supports UDT's. DevArt Objects documentation
I can connect with the DataContext to the Oracle database however I get errors in running the query against the oracle database. I looked at the SQL generated and it is for MSSQL and not Oracle PSQL.
Does anybody know of a decent easy to use wrapper to use LINQ against an Oracle Database?
No, LINQ to SQL is very much MS SQL only - think of it as a client driver.
Microsoft is/was helping Oracle and DataDirect develop providers for Oracle and other non-MS database servers.
We use the OraDirect driver from Devart. It includes ADO.NET Entity framework support. You can download a trial version here. You may then use LINQ to entities or entity SQL on top of this.
The pricing of this is quite developer friendly, you pay per developer seat and you may use it however you like.
Another big advantage of this driver is that you can use it without installing an Oracle client, this is a big plus and worth the price alone.
#Greg: We evaluated the datadirect drivers as well, but the performance was poor and cost astronomical.
Edit: It seems DevArt announced a beta with LINQ support recently
One thing you might look into is that there is now LINQ to Entities, which leverages the MS Entity Framework, which I believe is DB agnostic. I'm still looking into how it works myself, but if you could create an ADO.NET Data Entity that interfaces with Oracle, you could then use LINQ against that Entity.
There's also Lightspeed which has a per-organization (not per-developer) license scheme and seems to have a pretty solid documentation library and a free trial version (up to 8 entities). I'm checking this out presently.
After a long search I found DbLinq and should do the trick. I am going to try it myself. I came across your question because I was searching for the same solution. Hope it helps.
Do look at Linq to entities though. I have a datareader populate a collection of objects that are mapped to the oracle table. I can use linq to query that collection in very powerful, simple, and easy ways. I love it. Highly recommend.
Try Devart LinqConnect. This product allows you to work with Oracle, etc.
Why not try ALinq ？ http://www.alinq.org
Look in codeplex:
Linq To Oracle project
Not an easy way, at least until a good provider is produced.
Really MS should provide at least an OLEDB Linq provider. After all, Linq to Sql is basically an implementation of IQueryable with designer support.
Another cross-database solution that works fairly well across Oracle, SQLite, MySQL and SQL Server is eXpress Persistent Objects