Disconnected Data Store Options

Oct 4, 2007

I have a .Net database application that we've successfully deployed in a connected environment. Now we have a client that has the need to store data on a central SQL Server and publish that data out to tablet PC's that will be able to disconnect from the central SQL Server. At some point those tablet PC's will come back in and connect to the central server via VPN and will need to push their changes back to the server. Some fundamental questions:

1) Am I correct in assuming that replication is the best way to accomplish this?

If so,

2) Which replication type sounds appropriate to the above scenario?

3) Am I correct in assuming that the tablet PC's will need some version of SQL Server to support editing of the data in the disconnected state?


My perhaps incorrect first take on this was that we could use a licensed SQL Server on the central server and SQL Server Express as a replication subscriber on the tablet PC's.

Any guidance greatly appreciated!

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Dropdown Other Options..how To Store?

Jun 2, 2005

Hi
Often we come across a form with a dropdown list (populated from a lookup table) with "Other" option as well. When user selected "Other" option a textbox appears where he can specify new option(This option is not to be added to master lookup table).

What is the best way to store it in database?
I have 2 columns (A and B). 'A' contains Lookup ID if some option other than "Other" is selected, else 'A' has NULL and 'B' field contains the text of Textbox.

But while reporting I face problems as in a report the selected option text (either 'A' or 'B') has to be shown under one column only but SELECT A,B results in 2 columns.

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Hi,

We have two disconnected tables as shown below.
Table A Table B
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Values 1 x S 3 xO e e S
2 XR S 4 UI re er S
9 YU w re S

8 OP we we S


We want to display the data from table A and table B as below.



Class_No Class_Name State Calss_NO Cola ColB ColC State

1 x S 3 xo e e S
2 XR S 4 UI re er S
9 YU w re S
8 OP we we S

Can it be done ? What should be sql query.

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Hi ...

This is a C++ / ADO / SQL question. Maybe not the right forum but I am guessing there are some programmers out there ...

I am trying to use ADO disconnected recordset to insert data into a sql table. I am using AddNew(vField, vValue) with UpdateBatch(). The code below does not throw any exceptions ... but does not add data to the table.

Any comments are appreciated,
Thanks,
Chris

void CTestApp::TestDatabaseUpdateBatch1a(void)
{
int nDataCount = 0;
long nIndex = 0;
long nIndex2 = 0;

CString csMessage;
CString csErrorMessage;
CString csTemp;
CString csSQL;

BOOL bIsOpen;
BOOL bIsEmpty;

long nCount = 0;
int nTemp = 0;
int nLimit = 0;

int nTempInt = 0;
long nTempLong = 0;
double nTempDouble = 0;

HRESULT hResult;

SYSTEMTIME st;


int i = 0;

string strTemp;

_variant_t sval;

_variant_t vNull;
vNull.vt = VT_ERROR;
vNull.scode = DISP_E_PARAMNOTFOUND;

COleSafeArray colesaFieldList;
COleSafeArray colesaDataList;

vector<COleSafeArray> *pvecDataList;

pvecDataList = new vector<COleSafeArray>;


COleDateTime oledtCurrentDate = COleDateTime::GetCurrentTime();

// Convert the OleDateTime to the varient
// COleVariant vCurrentDateTime(oledtCurrentDate);
COleVariant vCurrentDateTime;

CMxTextParse *pMxTextParse = NULL;

CMainFrame *pMainFrame = (CMainFrame *)AfxGetMainWnd();
CFrameWnd* pChild = pMainFrame->GetActiveFrame();
CTestMeteorlogixView* pView = (CTestMeteorlogixView*)pChild->GetActiveView();

pView->WriteLog("Start TestDatabaseUpdateBatch1a.");
pView->WriteLog("Load table using AddNew() and UpdateBatch().");


// Define ADO connection pointers
_ConnectionPtr pConnection = NULL;
_RecordsetPtr pRecordset = NULL;

try
{
// When we open the application we will open the ADO connection
pConnection.CreateInstance(__uuidof(Connection));

// Replace Data Source value with your server name.
bstr_t bstrConnect("Provider='sqloledb';Data Source='SQLDEV';"
"Initial Catalog='AlphaNumericData';"
"User Id=cmacgowan;Password=cmacgowan");

// Open the ado connection
pConnection->Open(bstrConnect,"","",adConnectUnspecified);

// Create an instance of the database
pRecordset.CreateInstance(__uuidof(Recordset));

// Select the correct sql string. Note that we are creating an
// empty string by doing a select on the primary key. We are only
// doing inserts and we do not want to bring data back from the
// server

csSQL = "SELECT * FROM dbo.AAMacgowanTest WHERE RecordId IS NULL";
// csSQL = "SELECT * FROM dbo.DICastRaw1Hr";


pRecordset->PutRefActiveConnection(pConnection);
pRecordset->CursorLocation = adUseClient;


pRecordset->Open(csSQL.AllocSysString(), vNull, adOpenStatic, adLockOptimistic, -1);

// Test to see if the recordset is connected
if(pRecordset->GetState() != adStateClosed)
{
// The recordset is connected, we will see if we are
// at the end

if((pRecordset->BOF) && (pRecordset->GetadoEOF()))
{
// The recordset is empty
bIsEmpty = false;
}


if(pRecordset->GetadoEOF())
{
bIsOpen = false;
}
else
{
// disconnect the database
pRecordset->PutRefActiveConnection(NULL);
}
}


// disconnect the database
// pRecordset->PutRefActiveConnection(NULL);

// Disassociate the connection from the recordset.
pRecordset->PutRefActiveConnection(NULL);

// Set the count
nCount = 1;

// now we will scroll through the file
while(nCount > 0)
{
nCount--;

nDataCount = 10;

// test that we got some data
if (nDataCount >= 0)
{
// Start the insert process
// m_pRecordset->AddNew();

COleSafeArray warningList;
//int index, listIndex = -1, bitIndex; // indexing variables
// long lowIndex, highIndex, arrayIndex[2];

VARIANT vFieldList[25];
VARIANT vValueList[25];

int nFieldIndex = 0;
int nValueIndex = 0;


// Setup the fields
vFieldList[nFieldIndex].vt = VT_BSTR;
vFieldList[nFieldIndex].bstrVal = ::SysAllocString(L"Name");
nFieldIndex++;

vFieldList[nFieldIndex].vt = VT_BSTR;
vFieldList[nFieldIndex].bstrVal = ::SysAllocString(L"Section");
nFieldIndex++;

vFieldList[nFieldIndex].vt = VT_BSTR;
vFieldList[nFieldIndex].bstrVal = ::SysAllocString(L"Code");
nFieldIndex++;

vFieldList[nFieldIndex].vt = VT_BSTR;
vFieldList[nFieldIndex].bstrVal = ::SysAllocString(L"Latitude");
nFieldIndex++;

vFieldList[nFieldIndex].vt = VT_BSTR;
vFieldList[nFieldIndex].bstrVal = ::SysAllocString(L"Longitude");
nFieldIndex++;


pView->WriteLog("Set data using AddNew() ...");

// COleDateTime is a wrapper for VARIANT's DATE type. COleVariant is
// a wrapper for VARIANTs themselves. If you need to create a
// variant, you can say:
COleDateTime oledtCurrentDate2 = COleDateTime::GetCurrentTime();

// Convert the OleDateTime to the varient
COleVariant vCurrentDateTime2(oledtCurrentDate2);

//Set the DATE variant data type.
memset(&st, 0, sizeof(SYSTEMTIME));
st.wYear = 2000;
st.wMonth = 1;
st.wDay = 1;
st.wHour = 12;

// vect is a vector of COleSafeArrays containing the records
for(i = 0; i < 10; i++)
{

// Setup the data
nValueIndex = 0;
vValueList[nValueIndex].vt = VT_BSTR;
vValueList[nValueIndex].bstrVal = ::SysAllocString(L"BLUE");
nValueIndex++;

vValueList[nValueIndex].vt = VT_BSTR;
vValueList[nValueIndex].bstrVal = ::SysAllocString(L"KSTP");
nValueIndex++;

vValueList[nValueIndex].vt = VT_I4;
vValueList[nValueIndex].dblVal = 100 + nFieldIndex;
nValueIndex++;

vValueList[nValueIndex].vt = VT_R8;
vValueList[nValueIndex].dblVal = 11.11 + nFieldIndex;
nValueIndex++;

vValueList[nValueIndex].vt = VT_R8;
vValueList[nValueIndex].dblVal = 22.22 + nFieldIndex;
nValueIndex++;

// Add the record to the recordset
pRecordset->AddNew(vFieldList, vValueList);
}



pView->WriteLog("Call UpdateBatch().");

// Re-connect.
pRecordset->PutRefActiveConnection(pConnection);

// Send updates.
pRecordset->UpdateBatch(adAffectAll);

// Close the recordset and the connection
pRecordset->Close();
pConnection->Close();

}
}
}
catch(_com_error *e)
{
CString Error = e->ErrorMessage();
AfxMessageBox(e->ErrorMessage());
pView->WriteLog("Error processing TestDatabase().");
}
catch(...)
{
csMessage = "Undefined exception handled. Error message details ";

hResult = GetAdoErrorMessage(m_pConnection,
&csErrorMessage);

csMessage += csErrorMessage;
csMessage += "method: CTestMeteorlogixApp::OnTestDatabaseAdoBulkload()";

AfxMessageBox(csMessage);

}

csTemp.Format("Last Row %03d DIcastId = %s ", nIndex, strTemp.c_str());
pView->WriteLog(csTemp);

pView->WriteLog("End TestDatabaseUpdateBatch1.");

}

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The problem:
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Hello,

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------------------------------------------------------------------------
 Create Procedure spUpdatePasswordByUserId
@userName varchar(20),
@password varchar(20)
AS
Begin
Declare @userId int
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if (@userId > 0)
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------------------------------------------------------------------
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May 16, 2007

Its been almost 10 years since I have had to do work with good-old RecordSet objects...



I am filling a RecordSet with data returned from a SQL server via a stored procedure. I then set the ActiveConnection property to Nothing in order to disconnect it so I can make changes to it.



But when I try to set the value on a given row I get back a "Multiple-step operation generated errors. Check each status value" error message. My understanding is that this is indicative of trying to use the wrong datatype. I have verified that the type is correct (I am dealing with integers) so I am at a loss for what the problem could be.



Here is my code:



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rsPackages.CursorLocation = adUseClient

rsPackages.LockType = adLockBatchOptimistic



rsPackages.Open "EXECUTE stp_FetchPackageData", myConn



rsPackages.ActiveConnection = Nothing



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Hi

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It was set up as a synchronise mirror

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Hi All,

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<%
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Const adUseClient = 3

strDataBase = "somedb.mdb"

set cnTraining = server.CreateObject("ADODB.Connection")

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%>

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use [TheDB]

exec sp_addsubscription @publication = N'Pub', @subscriber = N'Web2'', @destination_db = N'TheDB', @sync_type = N'Automatic', @subscription_type = N'pull', @update_mode = N'read only'

GO



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use [TheDB]

exec sp_addpullsubscription @publisher = N'Web1', @publication = N'Pub', @publisher_db = N'TheDB', @independent_agent = N'True', @subscription_type = N'pull', @description = N'', @update_mode = N'read only', @immediate_sync = 1



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GO



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While 1=1
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- I expected this while whitout disconnect, continue.

3- The while code stopped whit this message :

Msg 64, Level 20, State 0, Line 0 A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The specified network name is no longer available.)

4- I execute again the script, And it worked in new primary.

My questions :

1- is the listener disconnected between switched primary and secondary ? OR have we data loss between switching?

2- I did some huge update on Primary that fill the Log fiel space. And in last Update I got this error :

Msg 9002, Level 17, State 2, Line 27

The transaction log for database 'Your_DB' is full due to 'LOG_BACKUP'.

Is this (Fill All space) a reason to switch primary? Or not ?

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