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Pls guys, i wrote some code which is supposed to be installed on other computers. but when i finished, it could only run on my system, and generates SQL database errors when installed on other systems. the code was written in C#, i used the sql compact server that comes with visual studio 2008.this is how i wrote the connection string:
private static string connectionString()
{
string conString = @"Data Source=|DataDirectory|\electionsoft.sdf;Password=emejulu.4190;Persist Security Info=True";
return conString;
}
private void openConnection()
{
if(con.State == ConnectionState.Closed)
con.Open();
}
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What errors? What OS on the target?
Did you actually set the DataDirectory value somewhere? (Or did you forget to do that like I forgot to do that a while back?)
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The OS i'm using is Win7. How do i set the DataDirectory value
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Put this somewhere where it will run before doing any database stuff:
AppDomain.CurrentDomain.SetData("DataDirectory", System.Environment.GetFolderPath(System.Environment.SpecialFolder.CommonApplicationData));
Depending on whether you're installing for "everyone" or for each individual user, choose the CommonApplicationData or LocalApplicationData "SpecialFolder" there at the end.
And, of course, that's where the database file has to sit. (which makes debugging from within Visual Studio a pain in the butt.)
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Emejulu JVT wrote: Source=|DataDirectory|\electionsoft.sdf
Where does the 'DataDirectory' get put at? It's likely to be a permissions issue on Vista / Windows 7 if this is in the program files directory. Just guessing here as the actual error message was not included in the post.
Common sense is admitting there is cause and effect and that you can exert some control over what you understand.
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Hi,
I downloaded 'SSCERuntime_x64-ENU.exe' from http://www.microsoft.com/download/en/details.aspx?id=17876 but when I go in Visual Studio 2010 to Add Connection I only see Microsoft SQL Server Compact 3.5 and nothing for v4.
Am I missing something? Is there another download I should install? The system is Win7, 64bit.
Thanks in advance.
modified on Thursday, August 25, 2011 3:11 PM
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Hi I use this
ALTER TABLE table_name
ADD column_name datatype to add column in table. How to use Alter Query to add column in query? I use MS Access 2003.
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You can't add it.
Depends on what you mean by 'query'.
In terms of procs you must replace the proc either by using 'replace' or 'drop' and 'create'. Which one depends on the database.
If the query is other code then the code must be updated.
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for example I have 1 query in who participate 3 columns in 2 table and I want to add 1 column in first table and column in query will be 4. I want do this with code.
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ivo75 wrote: I want to add 1 column in first table and column in query will be 4.
As jschell indicated, you will need to use an alter statement to replace the existing view with a new one.
Here is a site that has more detail about how you alter a veiw in Access (I didn't think it was posible, but then I havent worked with MS Access since 1997)
http://allenbrowne.com/func-DDL.html[^]
Common sense is admitting there is cause and effect and that you can exert some control over what you understand.
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ivo75 wrote:
for example I have 1 query in who participate 3
columns in 2 table and I want to add 1 column in first table and column in query
will be 4. I want do this with code.
Not sure I understand what you are saying.
However you appear to be referring to that you now have the following:
select t.a, t.b, t.c from...
And you want the following:
select t.a, t.b, t.c, t.d from...
The problem with that is that SOMETHING is using the first query. And it is not going to magically use the second one. At best (depending on a number of things) it will simply do nothing at all. At worse something will fail in a way that makes it difficult to determine what happened.
So the best case has no impact - so no point in trying to change it.
In the worst case many things fail - so not point in trying to change it.
Thus it follows, what you think that you want to do will NOT work.
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alter exists column datatype.
alter table tblname
alter column columnname datatype(variablesize)
or
add new column................
alter table tblname
add columnname datatype(variablesize)
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For an existing Access database holding around 100 queries, I'm looking for a comfortable way to export the actual SQL statements that represent those queries; ideally I'd like some (C#) code that generates a DataTable, with columns queryName and SqlStatement. Alternatively, a command or script that tells Access to create a text file holding such information. Or some magical SQL snippet that creates a new table in the database itself.
To be perfectly clear, I need the SQL statements, not the results of the queries themselves. And I'll need to run it a couple of times in the next few months, so I don't plan on doing it manually, one by one!
Luc Pattyn [My Articles] Nil Volentibus Arduum
modified on Wednesday, August 24, 2011 10:12 AM
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This[^] is not exactly what you requested, but might prove a useful starting point.
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Thanks a lot, I got it working right away.
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Thanks for the quick response. I managed to solve my little problem with the first reply I got.
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Problem solved, using "good" old DAO from C# isn't that hard after all, and all that was required is this:
public override void GetQueries() {
DAO._DBEngine dbEng=new DAO.DBEngineClass();
DAO.Workspace ws = dbEng.CreateWorkspace("", "admin", "", DAO.WorkspaceTypeEnum.dbUseJet);
DAO.Database db = ws.OpenDatabase(File, false, false, "");
foreach(DAO.QueryDef q in db.QueryDefs) {
env.log(0, q.Name+" = "+q.SQL);
}
}
Thanks for all the input!
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Luc Pattyn wrote: DAO
WOW! That brings back memorys...Not entirly good ones but still
Common sense is admitting there is cause and effect and that you can exert some control over what you understand.
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Luc Pattyn wrote: DAO
Ahhhhh!!!! Good old DAO
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I'm not a big fan of Oracle and am quite happy to delegate the coding of the more complex stored procedures to others. Because of this lack of knowledge I need some opinions.
When building a SP is it reasonable to create a series of strings and then EXECUTE IMMEDIATE to load the results into a temp table.
The proc is complex and there are a number of steps so the temp table is valid but I have problems with the use of concatenated strings. I would think this would negate any benefit from compiling the proc as this would on validate the concatenation of the strings and not their content.
Never underestimate the power of human stupidity
RAH
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EXECUTE IMMEDIATE is a generally accepted method of coding dynamic sql in PLSql.
I use this methodology and have not had any issues - yes it can take a bit to get the concatenation of quotes etc correct - however in the end this works fine.
If you are concerned about the content of the queries you could put the queries into a meta table and pull the queries in and build your dynamic sql at runtime.
Continuous effort - not strength or intelligence - is the key to unlocking our potential.(Winston Churchill)
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My point is that I don't think EVERY query should be dynamic sql. It has it's place but not for every single query.
Never underestimate the power of human stupidity
RAH
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I completely agree 
Continuous effort - not strength or intelligence - is the key to unlocking our potential.(Winston Churchill)
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Not that this helps but...
I didn't know Oracle supported stored procedures, when I had to use it (1996-2001, Oracle 6?), we never used stored procedures, only PRO*C. And it was good. 
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