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C# ODBC MYSQL insert and update sql closing and openign a connection

Posted on 2011-09-24
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Last Modified: 2013-12-17
 Hi experts, have a system that can update and insert but when they are run one after the other
they throw up an error
A local variable named 'myOdbcCommand' is already defined in this scope
i understand that the object myOdbcCommand is defined twice what i want to know is how to destroy the object myOdbcCommand so if i want i can redefine it again later in the program.
i have done a myOdbcCommand.Connection.Close(); but this does not destroy the object any ideas. i litrally want to close all and then open it again in the next lines to allow me to clean up all my code before moving on



// **************************************************************
                // UPDATE RECORD
                // **************************************************************
                myInsertQuery = "UPDATE vtiger_account SET vtiger_account.accountname = 'xyz compnay' WHERE (((vtiger_account.accountid)=1264))";
                OdbcCommand myOdbcCommand = new OdbcCommand(myInsertQuery);
                myOdbcCommand.Connection = dbMySQL;
                dbMySQL.Open();
                myOdbcCommand.ExecuteNonQuery();
                myOdbcCommand.Connection.Close();

                //***************************************************************
                // INSERT RECORD
                //***************************************************************
           //     OdbcConnection myOdbcCommand = new OdbcConnection(myConnection);
                myInsertQuery = "INSERT INTO `vtiger_account` (`accountid`, `account_no`, `accountname`) VALUES('1267','ACC94','mmmmmmmmmmmm test kljkjkl1')";
                OdbcCommand myOdbcCommand = new OdbcCommand(myInsertQuery);
                myOdbcCommand.Connection = dbMySQL;
                dbMySQL.Open();
                myOdbcCommand.ExecuteNonQuery();
                myOdbcCommand.Connection.Close();
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Question by:sydneyguy
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3 Comments
 
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Accepted Solution

by:
theHollow earned 2000 total points
ID: 36592514
You cannot declare a variable with the same name twice. As far as I know, there is no way round that. I'm also not quite sure why you would like to declare it twice.

In my opinion, you have three choices.
1) Make the "Insert" and "Update" into two separate methods.
2) Declare two different namts for the "insert" and the "update" command
3) Declare the comamnd in the top and use the same variable.

OdbcCommand myOdbcCommand = null;

myUpdateQuery = "UPDATE vtiger_account SET vtiger_account.accountname = 'xyz compnay' WHERE (((vtiger_account.accountid)=1264))";
myInsertQuery = "INSERT INTO `vtiger_account` (`accountid`, `account_no`, `accountname`) VALUES('1267','ACC94','mmmmmmmmmmmm test kljkjkl1')";

myOdbcCommand = new OdbcCommand(myUpdateQuery);
myOdbcCommand.Connection = dbMySQL;
dbMySQL.Open();
myOdbcCommand.ExecuteNonQuery();
myOdbcCommand.Connection.Close();

myOdbcCommand = new OdbcCommand(myInsertQuery);
myOdbcCommand.Connection = dbMySQL;
dbMySQL.Open();
myOdbcCommand.ExecuteNonQuery();
myOdbcCommand.Connection.Close(); 

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I would cretainly make the variable "dbMySQL" more central to this code.
Because you can create a command with;
myOdbcCommand = dbMySQL.CreateCommand();

Hope it helped :-)
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Author Closing Comment

by:sydneyguy
ID: 36592552
thanks i have already broken it out into 3 methods.
how is your band going?
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LVL 4

Expert Comment

by:theHollow
ID: 36592663
Hi
The band is doing progress :-)
Feel free to check out our music @ MySpace
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