Database

31-Jan-03 5:18

Hello

I have som problem i hope you could help me with

First of al:
My computer name JIMMY-217
I have installd Mysql on my local computer and done no changes to it(it is running)

I have installd the SQL Server Service Manager, and its running(but i dont know where the sql files i located or how to change them).

I have the MyODBC installd(working)

My problem is to get connected with MySQL servern in C#.

I have tryed on the foolowing ways

closed the SQL Server Service Manager and only have the MySql(WinMySQLAdmin) running

this is the connection code:

SqlConnection dataConnection = new SqlConnection();<br />
dataConnection.ConnectionString = "Integrated Security=true;Initial Catalog = mysql; Data Source=localhost"; <br />
		<br />
dataConnection.Open();

But i get the Following error:
Cannot open database requested in login 'mysql'

mysql is a database that is i in the mysql server from start as example or somthing, if this is wrong how do i type to get the correct connection(adress)

I have tryed this turtorial(http://www.devarticles.com/art/1/250) and got it working with the Access file, but not with the SQL server.

If i start up the SQL Server Service Manager and make som changes for example
(Initial Catalog = Northwind), then it will connect to this server but it will say that it cant find the database, but this is not so inportant i think, the main thing is to get the connection to MySQL servern to work.

I hope you got som ides on this problem Big Grin | :-D

I have on more problem, in the mysql(WinMySQLAdmin) -> databases i cant get teh creat and delete commands, i think it has somthing to do with the login, i have to login on root or somthing, but how do i login with a diffrent user? i have tryd to change the my.ini but this didnt help.

Best Regards

Jimmy

Daniel Turini31-Jan-03 5:38

Daniel Turini

31-Jan-03 5:38

The SqlConnection from the System.Data.SqlClient is for connecting to a MS SQL Server. If you are trying connect to your MySql, try a OLEDB provider and use the OleDbConnection class.
Other way is by using the ODBC.NET library from MS.

I see dumb people

Snowjim31-Jan-03 6:36

31-Jan-03 6:36

Thanks for the help

I Think this code is right but i need to connect it to MySql.

OleDbConnection Myconnection = null; <br />
OleDbDataReader dbReader = null; <br />
<br />
Myconnection = new OleDbConnection (@"Provider=Microsoft.Jet.OLEDB.4.0; User Id=; Password=; Data Source=C:\familyTree.mdb"); <br />
Myconnection.Open();

I dont know how to change this code so it will work with mysql(have look along time)

I know that i have to change the User Id and pass to one that can loggon to the SQL server, but what do i change the Data Source to? (my computer name is JIMMY-217, but i dont know how to get the right adress to connect)
Then the first((@"Provider=Microsoft.Jet.OLEDB.4.0;) i probely have to change to.

Hope you have an ide on this

Best regards

Jimmy

kaschimer31-Jan-03 6:54

kaschimer

31-Jan-03 6:54

In addition to what has already been posted, you might want to try the tool at this link:

http://www.devhood.com/tools/tool_details.aspx?tool_id=655[^]

It seems to be a fully-managed provider for MySQL. I haven't tried it myself, but I did download the personal version (free). If you want to deploy it in a product or "real" application, it costs a little, but you get more features such as transactions, connection pooling, etc.

As was mentioned before, the SqlClient classes are designed specifically for MS SQL Server.

RabidK

Snowjim31-Jan-03 6:58

31-Jan-03 6:58

But cant i use OLE DB to connect to MYSQL
if i can how will the connection line look like

//Jimmy

David Salter1-Feb-03 10:18

1-Feb-03 10:18

I don't think you can use the OLEDB connection for MySQL.

Use ODBC.NET, it works just fine.

Dave.

Snowjim1-Feb-03 12:11

1-Feb-03 12:11

I have manage to connect to my local mysql database with this code

System.Data.OleDb.OleDbConnection con;<br />
con=new System.Data.OleDb.OleDbConnection("");<br />
con.ConnectionString="Provider=MySQLProv;Data Source=mysql;";<br />
			<br />
<br />
try<br />
{<br />
	con.Open();<br />
	if (con.State==ConnectionState.Open) MessageBox.Show("Connection to MySQL opened through OLE DB Provider");<br />
	con.Close();<br />
}<br />
catch(Exception ex)<br />
{<br />
	MessageBox.Show(ex.Message);<br />
}

How do i do to delete, change, read etc in this database, and how do i send mySQL commands with this? Do i realy have to use ODBC.NET to this?

I have installed ODBC.NET but it simes like the C# dont find the namespace using Microsoft.Data.Odbc

David Salter1-Feb-03 12:49

1-Feb-03 12:49

Have a look at the OleDbDataReader and OleDbCommand classes. These allow you to execute SQL against the database.

If you want to use ODBC.NET, you need to add a reference to it in visual studio. If you've got it to connect with OleDB however, theres not much advantage in using ODBC.

Dave.

Snowjim1-Feb-03 12:58

1-Feb-03 12:58

I am using MyOLEDB

Im realy comfused about al this diffrent connections(OLE DB, ODBC etc), maby you got a linkg about this?

Snowjim1-Feb-03 14:40

1-Feb-03 14:40

Hello again, now i have get the code to work, it shows the stuf in the mysql server in to a form in C#.

{<br />
	IDataReader reader;<br />
	IDbCommand cmd;<br />
	System.Data.OleDb.OleDbConnection con;<br />
	con=new System.Data.OleDb.OleDbConnection("");<br />
			con.ConnectionString="server=localhost;Provider=MySQLProv;Data Source=database;";<br />
<br />
	try<br />
	{<br />
		con.Open();<br />
		if (con.State==ConnectionState.Open)<br />
		{<br />
			cmd = con.CreateCommand();<br />
			cmd.CommandText = "UPDATE humans SET Name = 'Nisse'  WHERE id = '3'";<br />
			cmd.ExecuteNonQuery();<br />
			cmd.CommandText = "SELECT * FROM humans";<br />
			reader = cmd.ExecuteReader();<br />
<br />
			while (reader.Read())<br />
			{<br />
				lb.Items.Add(reader.GetString(1) + "  " + reader.GetString(2));<br />
			}<br />
			MessageBox.Show("Connection to MySQL opened through OLE DB Provider");<br />
			con.Close();<br />
			}<br />
		}<br />
		catch(Exception ex)<br />
		{<br />
		MessageBox.Show(ex.Message);<br />
		}<br />
	}<br />
<br />
}

But as you se i am trying to update the mysql data base. This does not work i get the following error DB_ERRORSINCOMMAND(0x80040E14)

Do you got a ide of why i get this error?

David Salter2-Feb-03 11:41

2-Feb-03 11:41

Snowjim wrote:
cmd.CommandText = "UPDATE humans SET Name = 'Nisse' WHERE id = '3'";

Is it because you have quotes around the 3?

Should it read:

cmd.CommandText = "UPDATE humans SET Name = 'Nisse' WHERE id = 3";

Dave

David Salter2-Feb-03 11:49

Timestamp and long problem in access

2-Feb-03 11:49

MyOleDB will only connect to MySQL.

OLEDB and ODBC will connect to a variety of databases. ODBC probably will connect to more because it can use normal ODBC drivers which have been around for a longer time.

If your app only has to work with only one database, then it doesn't really matter which you use.

Each of them have practically the same API so there isn't much in it programming wise.

Dave.

leppie30-Jan-03 23:12

30-Jan-03 23:12

Hi all

I wanna make a timestamp field in access, so I chose to use a DateTime field, but it appears .NET inserts only the date part of the value, no time part. So I decide to use a long integer instead (DateTime.ToFileTime()), but .NET (OleDBAdapter) sees this only as an int whether the field is a long integer or a normal integer.

WHat must I do?

CHeers Smile | :)

Who is this miscrosoft, and what devilish plans have they for us?

Bernhard Hofmann31-Jan-03 1:40

Bernhard Hofmann

31-Jan-03 1:40

If you're inserting records, a simple way is to not insert a value, but let Access insert it for you. So create the datetime column, set it's default value to "Now()" in Access, and leave it out of your insert statement!

leppie31-Jan-03 4:16

31-Jan-03 4:16

Bernhard Hofmann wrote:
set it's default value to "Now()" in Access, and leave it out of your insert statement!

Exactly what I ended up doing Smile | :)

Thanks anyways.

Who is this miscrosoft, and what devilish plans have they for us?

leppie31-Jan-03 23:18

31-Jan-03 23:18

Bernhard Hofmann wrote:
If you're inserting records, a simple way is to not insert a value, but let Access insert it for you. So create the datetime column, set it's default value to "Now()" in Access, and leave it out of your insert statement!

Thats all nice and well, but what about my SELECT statement now? Same problem... Frown | :(

Who is this miscrosoft, and what devilish plans have they for us?

Bernhard Hofmann3-Feb-03 5:18

Bernhard Hofmann

3-Feb-03 5:18

Hi
From what I've read, you should be using the Date OleDbType (DBTYPE_DATE), which "maps" to a System.DateTime. The DBTYPE_DATE is a double, with

"The whole portion is the number of days since December 30, 1899, while the fractional portion is a fraction of a day." - MSDN Library

What programming language?

(BTW: Nice DUMeter)

leppie3-Feb-03 6:10