protected OdbcHandle(ODBC32.SQL_HANDLE handleType, OdbcHandle parentHandle) : base(IntPtr.Zero, true)
{
this._handleType = handleType;
bool success = false;
ODBC32.RetCode sUCCESS = ODBC32.RetCode.SUCCESS;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
switch (handleType)
{
case ODBC32.SQL_HANDLE.ENV:
sUCCESS = UnsafeNativeMethods.SQLAllocHandle(handleType, IntPtr.Zero, out this.handle);
goto Label_0099;
case ODBC32.SQL_HANDLE.DBC:
case ODBC32.SQL_HANDLE.STMT:
parentHandle.DangerousAddRef(ref success);
sUCCESS = UnsafeNativeMethods.SQLAllocHandle(handleType, parentHandle, out this.handle);
goto Label_0099;
}
}
finally
{
if (success)
{
switch (handleType)
{
case ODBC32.SQL_HANDLE.DBC:
case ODBC32.SQL_HANDLE.STMT:
if (!(IntPtr.Zero != base.handle))
{
goto Label_0092;
}
this._parentHandle = parentHandle;
break;
}
}
goto Label_0098;
Label_0092:
parentHandle.DangerousRelease();
Label_0098 :;
}
Label_0099 :
Bid.TraceSqlReturn("<odbc.SQLAllocHandle|API|ODBC|RET> %08X{SQLRETURN}\n", sUCCESS);
if ((ADP.PtrZero == base.handle) || (sUCCESS != ODBC32.RetCode.SUCCESS))
{
throw ODBC.CantAllocateEnvironmentHandle(sUCCESS);
}
}
protected OdbcHandle(ODBC32.SQL_HANDLE handleType, OdbcHandle parentHandle) : base(IntPtr.Zero, true)
{
_handleType = handleType;
bool mustRelease = false;
ODBC32.RetCode retcode = ODBC32.RetCode.SUCCESS;
// using ConstrainedRegions to make the native ODBC call and AddRef the parent
RuntimeHelpers.PrepareConstrainedRegions();
try
{
// validate handleType
switch (handleType)
{
case ODBC32.SQL_HANDLE.ENV:
Debug.Assert(null == parentHandle, "did not expect a parent handle");
retcode = Interop.Odbc.SQLAllocHandle(handleType, IntPtr.Zero, out base.handle);
break;
case ODBC32.SQL_HANDLE.DBC:
case ODBC32.SQL_HANDLE.STMT:
// must addref before calling native so it won't be released just after
Debug.Assert(null != parentHandle, "expected a parent handle"); // safehandle can't be null
parentHandle.DangerousAddRef(ref mustRelease);
retcode = Interop.Odbc.SQLAllocHandle(handleType, parentHandle, out base.handle);
break;
// case ODBC32.SQL_HANDLE.DESC:
default:
Debug.Fail("unexpected handleType");
break;
}
}
finally
{
if (mustRelease)
{
switch (handleType)
{
case ODBC32.SQL_HANDLE.DBC:
case ODBC32.SQL_HANDLE.STMT:
if (IntPtr.Zero != base.handle)
{
// must assign _parentHandle after a handle is actually created
// since ReleaseHandle will only call DangerousRelease if a handle exists
_parentHandle = parentHandle;
}
else
{
// without a handle, ReleaseHandle may not be called
parentHandle.DangerousRelease();
}
break;
}
}
}
if ((ADP.PtrZero == base.handle) || (ODBC32.RetCode.SUCCESS != retcode))
{
//
throw ODBC.CantAllocateEnvironmentHandle(retcode);
}
}