I am creating a C# assembly for MS SQL Server 2005 for encryption/decryption.
I need to query the database in this assembly, and was wondering what the preferred method of connecting to the database is? I believe we would not want to have a username/password in the connection string.
Since the assembly is registered in MS SQL does it have some sort of quick way to access data in the database?
I'm a little bit of a newb as it related to Integrated Security or Trusted Connections.
You can use the following connection string when using CLR stored procedures:
using(SqlConnection connection = new SqlConnection("context connection=true"))
{
// ..
}
Related
I have the version 9.1.131.0.
I want to connect to a Oracle 12 DB with a Service Name.
I have the login, pw, server, but it seems i can't add a service name or port to OracleConnectionStringBuilder.
How do i connect to my db with a service name?
I can make it happen with Oracle.ManagedDataAccess but due to performance issues i want to test if the Devart Driver is working better.
kind regards
Try SID instead of Service Name. I found this one: Using Direct Mode
SID** System identifier (Global Database Name)
** The Service Name connection string parameter can be used instead of SID, but in the Direct Mode you can connect only to one database instance (RAC isn't supported).
For me this works:
var str = new DbConnectionStringBuilder(false);
str.Add("Data Source", db);
str.Add("User ID", user);
str.Add("Password", pw);
var con = new Devart.Data.Oracle.OracleConnection(str.ConnectionString);
con.Open();
You can also put full connection string as data source instead of retrieving the alias from tnsnames.ora file, e.g.
string db = "(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST={host})(PORT=1521))(CONNECT_DATA=(SERVICE_NAME={serviceName})))";
str.Add("Data Source", db);
So this is my conclusion:
Since I don't want my users to install the Oracle Client or a install package more than 10 MB, the Devart dotConnect Express for Oracle will not work.
Quote from exception:
"Express Edition doesn't support Direct mode. Do not use Direct parameter of connection string. Refer to dotConnect for Oracle editions matrix."
Thanks for the help.
Kind regards
I'm currently working on a wpf application where I tried to create a database.
I used data sources > add new datasource > dataset and copied the query string for its properties, but it is giving me the following exception:
What might be the problem? This is a local database... and when I click on the test connection button it writes "test connection succeeded"
Thanks
You are connecting to an SDF file. This means that you are using Sql Server Compact, not the full fledged Sql Server.
The classes to be used are named
SqlCeConnection
SqlCeCommand
The one you are using (SqlConnection) cannot understand the connection string used for a Sql Server Compact
Of course you need to add the reference to the assembly and the appropriate using directives
Assembly: System.Data.SqlServerCe.dll
using System.Data.SqlServerCe;
....
You are using a SqlConnection rather than the SqlCeConnection that you require. SqlConnection is for connecting directly to a "real" sql server.
Take a look at the MSDN for more information.
I created a new database using SQL Server 2008 R2 by using the Management Studio. The connection says (local) and I am using Windows Authentication (though I installed with mixed mode).
My questions are:
How do I connect to the DB via my C# application -
The only time I ever have done this before I just used VS Menu > Tools > Connect to DB and the drop down saw my database and connected, then right clicked on it and grabbed the connection string for use in connecting. However I'm thinking because its (local) I don't have that option.
As per Q#1 I am assuming the database file is being stored somewhere locally - I am wondering how to find that location and how I can include it with my application
Edit** Per comment: VSMenu-> View-> Server Explorer and then use add connection to connect to your local SQL Server instance and then use the database you created from the databases dropdown, and from advance settings copy the connection string created by the connection dialog
This is what I am looking for but I am missing the step during "add connection" where do I find my SQL Server I created locally? As mentioned before I have no idea where it is stored or how to find it
MSDN has an example in the SQLConnection documentation
using (var connection = new SqlConnection(connectionString))
using (var command = new SqlCommand(queryString, connection))
{
command.Connection.Open();
command.ExecuteNonQuery();
}
You can then optionally use a SqlDataAdapter.
You need to use ADO.NET, which is comprised of a connection object (SqlConnection), command object (SqlCommand), parameters objects (SqlParameter) and data sets (DataSet) or data readers (SqlDataReader).
Read A Beginner's Tutorial for Understanding ADO.NET.
I have a SQL CLR stored procedure written in c# (.NET4). Its purpose is to allow a trigger on a table in a SQL Server 2012 database to call a web service which then processes the data in that table.
However, there are several different databases which will all have triggers using this assembly. My web service needs to know which database is triggered the call to it in order to know where to get the data from.
I could simply add a parameter to my stored procedure but I want to keep things simple from the database side. Is there any way, in .NET, to obtain information about the database to which the assembly is attached?
Aah, found one:
This still opens a context connection to the database, but it's about the only way I can see.
using (SqlConnection conn = new SqlConnection("context connection=true"))
{
conn.Open();
string dbName = conn.Database
}
That's from an MSDN article. Also, the MSDN article on Context Connection.
I'm creating a very basic CRUD desktop winforms application in C#/.NET 4.0.
Letting Visual Studio auto-generate the fields for the table I'd like to perform my CRUD operations on works just fine, but I'm running into problems when I try and interact with it manually with my own SQL queries.
The auto-generated fields are using the connection string:
Data Source=|DataDirectory|\Data Analysis.sdf
If I try and do:
SqlConnection conn = new SqlConnection(#"Data Source=|DataDirectory|\Data Analysis.sdf");
conn.Open();
It just hangs. What am I missing?
That's a connection string for a SQL Server Compact Edition (CE) database (everything stored inside a single .sdf file) - is that what you're using?
If so : in that case, you'd have to use SqlCeConnection (not a SqlConnection - that's for "grown-up" SQL Server version - not CE)
Maybe try adding some more options to the connection string:
Persist Security Info=False;
File Mode=shared read;
Believe you've specified a relative path to the .sdf file, where you might need to get the executable's runtime folder from System.Environment.CurrentDirectory and prepend it to the filename.