(ODBC SQL types affected: BINARY, VARBINARY,
LONGVARBINARY)
ODBC_BINMODE_PASSTHRU: Passthru BINARY data
ODBC_BINMODE_RETURN: Return as is
ODBC_BINMODE_CONVERT: Convert to char and return
When binary SQL data is converted to character C data,
each byte (8 bits) of source data is represented as two ASCII
characters. These characters are the ASCII character
representation of the number in its hexadecimal form. For
example, a binary 00000001 is converted to "01" and a binary 11111111 is converted to "FF".
If odbc_fetch_into() is used, passthru means
that an empty string is returned for these columns.
If result_id is 0, the settings apply as default for new
results.
注: Default for longreadlen is 4096 and binmode defaults to ODBC_BINMODE_RETURN. Handling of binary long columns is also affected by odbc_longreadlen()