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CRecordset update record causing assertion failure

Posted on 2004-08-25
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Last Modified: 2013-11-20
Dear:
I have problem when try to update a record using CRecordset , that when make
TRY ...CATCH and error message said [Recordset is Readonly],
what I did i build MFC Application then , I added new Class derived from
CRecordset and did the following code inside OnInitDialogue:

CClients dbRecord;// CClient my derived class from CRecordset
dbRecord.Edit();//here Debug assertion failure occurred;
dbRecord.m_Address = "FL";
...
....
..
dbRecord.Update();

any ideas?


Regards

0
Comment
Question by:raed_hasan
  • 3
5 Comments
 
LVL 44

Expert Comment

by:AndyAinscow
ID: 11893626
You posted the answer yourself.
error message said [Recordset is Readonly]

you CAN'T edit a readonly recordset.
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LVL 44

Expert Comment

by:AndyAinscow
ID: 11893696
Is your recordset based on a query?  If yes then your query may not be editable (groups/sums information, joins to other tables, there are a number of reasons why it might not be editable).

Is the database itself readonly?  Do you only have read allowances to the table in the database?  Is the database on a drive/directory you don't have write permissions for?
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LVL 2

Author Comment

by:raed_hasan
ID: 11899717
Ok, but what i need is how to disable Readonly property in CRecordset cause , i did the following code:

CDatabase dbConnection;
dbConnection.OpenEx("DSN=TestDB;uid=sa;pwd=");

//dbConnection.Open("ODBC;DSN=SQL Server;UID=sa;PWD=");
CRecordset dbRecord(&dbConnection);
//SQL Select Statement
char  Sql[1024] = "UPDATE Clients SET Counter = 1 WHERE ClientID = '";
strcat(Sql,"000000000402");
strcat(Sql,"'");
TRY
{
     dbRecord.Open(CRecordset::snapshot,Sql,CRecordset::none);//Assertion Failure here
    //in Assertion Message Box ( File Name : dbCore.cpp) (Line: 3282)


}
CATCH(CDBException,e)
{
      char s[256]="\0";
      strcpy(s,e->m_strError);

}
END_CATCH



Regards
0
 
LVL 44

Accepted Solution

by:
AndyAinscow earned 90 total points
ID: 11900103
The SQL statement begins with UPDATE - that is a command to manipulate the contents of a table/query.  It is NOT used to return records.  A statement like that is typically used as follows

dbConnection.ExecuteSQL(Sql);
0
 

Expert Comment

by:rpatna
ID: 11900750
try this:
CDatabase      database;

if(!database.Open(_T(<dsnName>),FALSE,FALSE,_T("ODBC;")))
{
      return 0;      // if DataBase not opened
}
CRecordset      recSet(&database);
CString            sqlCmd;
sqlCmd      =      "SELECT * ";
sqlCmd  +=      "FROM BIT_SYNC WHERE SetupName = ";
sqlCmd      +=      "'";
sqlCmd      +=  setupName;
sqlCmd      +=      "'";
if(!recSet.Open( CRecordset::forwardOnly,_T( sqlCmd ) ))
{
      if (database.IsOpen())
             database.Close();
             return FALSE;
}
CDBVariant      dbVariant;
while( !recSet.IsEOF( ) )
{
index = 1;
recSet.GetFieldValue( index++, dbVariant );
rBitSyncData->source = dbVariant.m_chVal;
. . .

}
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