public long Erase(long offset, long amount)
{
this.AssertObjectNotDisposed();
if (this.IsNull)
{
throw System.Data.Common.ADP.LobWriteInvalidOnNull();
}
this.AssertAmountIsValid(amount, "amount");
this.AssertAmountIsEven(offset, "offset");
this.AssertPositionIsValid();
this.AssertConnectionIsOpen();
this.AssertTransactionExists();
if ((offset < 0L) || (offset >= 0xffffffffL))
{
return(0L);
}
uint num4 = (uint)this.AdjustOffsetToOracle(amount);
uint num3 = ((uint)this.AdjustOffsetToOracle(offset)) + 1;
int rc = TracedNativeMethods.OCILobErase(this.ServiceContextHandle, this.ErrorHandle, this.Descriptor, ref num4, num3);
if (rc != 0)
{
this.Connection.CheckError(this.ErrorHandle, rc);
}
return(this.AdjustOracleToOffset((long)num4));
}
/// <include file='doc\OracleLob.uex' path='docs/doc[@for="OracleLob.Erase2"]/*' />
public long Erase(
long offset,
long amount
)
{
AssertObjectNotDisposed();
if (IsNull)
{
throw ADP.LobWriteInvalidOnNull();
}
AssertAmountIsValid(amount, "amount");
AssertAmountIsEven(offset, "offset");
AssertPositionIsValid();
AssertConnectionIsOpen();
AssertTransactionExists();
if (offset < 0 || offset >= (long)UInt32.MaxValue) // MDAC 82575
{
return(0);
}
UInt32 eraseAmount = (UInt32)AdjustOffsetToOracle(amount);
UInt32 eraseOffset = (UInt32)AdjustOffsetToOracle(offset) + 1; // Oracle is 1 based, we are zero based.
EnsureBuffering(false);
// Erase (zero or space fill) bytes from the specified offset
int rc = TracedNativeMethods.OCILobErase(
ServiceContextHandle,
ErrorHandle,
Descriptor,
ref eraseAmount,
eraseOffset
);
if (0 != rc)
{
Connection.CheckError(ErrorHandle, rc);
}
long bytesErased = AdjustOracleToOffset(eraseAmount);
return(bytesErased);
}
