/**
Helper function. Get the next available itemId for the item.
Reads all existing ItemIds for the specified DscId, then calculates last+1
or first-1 depending on aPos. Will never return 0 as its reserved to mean
not yet persistent.
*/
TInt CDscDatabase::GetNextItemIdL(TDscPosition aPos, const TUid& aDscId) const
{
RDbView view;
CleanupClosePushL(view);
RBuf sqlCmd;
CleanupClosePushL(sqlCmd);
sqlCmd.CreateL(KSqlQueryAllItemIdsLength);
sqlCmd.Format(KSqlQueryAllItemIds, &KItemIdCol, &KItemTable,&KDscIdCol, aDscId, &KItemIdCol );
DebugPrint(sqlCmd);
User::LeaveIfError(view.Prepare(iDatabase, sqlCmd));
User::LeaveIfError(view.EvaluateAll());
CleanupStack::PopAndDestroy(&sqlCmd);
TInt nextId = 1; //add first item with id=1 and reserve 0 to mean "not yet persistent"
if (aPos==ELast && view.LastL())
{
//add at ELast: pos =max of itemId+1
view.GetL();
nextId = view.ColInt(1);
if(KMaxTInt == nextId)
{
User::Leave(KErrOverflow);
}
//increase, make sure to not use 0 as itemid in the database
nextId = (-1==nextId) ? (nextId+2) : (nextId+1);
}
else if (aPos==EFirst && view.FirstL())
{
//add at EFirst: pos=min of itemId-1
view.GetL();
nextId = view.ColInt(1);
if(KMinTInt == nextId)
{
User::Leave(KErrUnderflow);
}
//decrease, but reserve 0 to mean "not yet persistent"
nextId = (1==nextId) ? (nextId-2) : (nextId-1);
}
CleanupStack::PopAndDestroy(&view);
return nextId;
}
/**
@SYMTestCaseID SYSLIB-DBMS-CT-3407
@SYMTestCaseDesc Test for defect DEF103023 - DBMS requires ReadDeviceData and WriteDeviceData capability to read from the db.
The current test application has no capabilities at all.
"C:TestDB.DB" database is a secure shared database with:
- no "READ" polycy (no restrictions apply to the database read operations);
- "WRITE" policy with "WriteUserData" capability defined;
- "SCHEMA" policy with "NetworkServices" capability defined;
- table C has no defined securoty policy, so the database security policy will be used;
The current test application should be able to:
- begin/commit/rollback a "read-only" transaction;
But should fail if:
- begin a transaction and try to modify the database within the transaction;
This test function asserts the test cases described above.
@SYMTestPriority High
@SYMTestActions Test for defect DEF103023 - DBMS requires ReadDeviceData and WriteDeviceData capability to read from the db.
@SYMTestExpectedResults Test must not fail
@SYMDEF DEF103023
*/
void DEF103023L()
{
TheTest.Printf(_L("Begin a transaction. Read-only operations tested\n"));
TInt err = TheDb.Begin();
TEST2(err, KErrNone);
TheTest.Printf(_L("Perform some read-only operations inside the transaction\n"));
err = TheView.Prepare(TheDb, _L("SELECT * FROM C"));
TEST2(err, KErrNone);
err = TheView.EvaluateAll();
TEST2(err, KErrNone);
TInt cnt = TheView.CountL();
TEST(cnt > 0);
TBool rc = TheView.FirstL();
TEST(rc);
TheView.GetL();
TInt val = TheView.ColInt32(1);
rc = TheView.LastL();
TEST(rc);
rc = TheView.NextL();
TEST(!rc);
rc = TheView.PreviousL();
TEST(rc);
TheView.BeginningL();
TheView.EndL();
TheView.Close();
TheTest.Printf(_L("Commit a transaction\n"));
err = TheDb.Commit();
TEST2(err, KErrNone);
//
TheTest.Printf(_L("Begin a transaction. Read-only operations tested\n"));
err = TheDb.Begin();
TEST2(err, KErrNone);
err = TheView.Prepare(TheDb, _L("SELECT * FROM C"));
TEST2(err, KErrNone);
err = TheView.EvaluateAll();
TEST2(err, KErrNone);
cnt = TheView.CountL();
TEST(cnt > 0);
TheView.Close();
TheTest.Printf(_L("Rollback a transaction\n"));
TheDb.Rollback();
//
TheTest.Printf(_L("Begin a transaction. Tested operations violate the database security\n"));
err = TheDb.Begin();
TEST2(err, KErrNone);
err = TheView.Prepare(TheDb, _L("SELECT * FROM C"));
TEST2(err, KErrNone);
err = TheView.EvaluateAll();
TEST2(err, KErrNone);
rc = TheView.FirstL();
TEST(rc);
TheView.GetL();
TheTest.Printf(_L("An attempt to update a record within the transaction\n"));
TRAP(err, TheView.UpdateL());
TEST2(err, KErrPermissionDenied);
TheTest.Printf(_L("An attempt to delete a record within the transaction\n"));
TRAP(err, TheView.DeleteL());
TEST2(err, KErrPermissionDenied);
TheTest.Printf(_L("An attempt to insert a record within the transaction\n"));
TRAP(err, TheView.InsertL());
TEST2(err, KErrPermissionDenied);
TheView.Close();
TheTest.Printf(_L("An attempt to modify the database schema within the transaction\n"));
err = TheDb.Execute(_L("CREATE TABLE C2(Id INTEGER, Z INTEGER)"));
TEST2(err, KErrPermissionDenied);
TheTest.Printf(_L("An attempt to execute an INSERT statement within the transaction\n"));
err = TheDb.Execute(_L("INSERT INTO C VALUES(100)"));
TEST2(err, KErrPermissionDenied);
TheTest.Printf(_L("An attempt to modify the database within the transaction using RDbUpdate\n"));
RDbUpdate update;
err = update.Execute(TheDb, _L("INSERT INTO C VALUES(200)"));
TEST2(err, KErrPermissionDenied);
update.Close();
TheTest.Printf(_L("Rollback a transaction\n"));
TheDb.Rollback();
}