(PHP 4, PHP 5, PHP 7)
odbc_binmode — Handling of binary column data
$result_id
, int $mode
)Enables handling of binary column data. ODBC SQL types affected are BINARY, VARBINARY, and LONGVARBINARY.
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".
| binmode | longreadlen | result |
|---|---|---|
ODBC_BINMODE_PASSTHRU |
0 | passthru |
ODBC_BINMODE_RETURN |
0 | passthru |
ODBC_BINMODE_CONVERT |
0 | passthru |
ODBC_BINMODE_PASSTHRU |
0 | passthru |
ODBC_BINMODE_PASSTHRU |
>0 | passthru |
ODBC_BINMODE_RETURN |
>0 | return as is |
ODBC_BINMODE_CONVERT |
>0 | return as char |
If odbc_fetch_into() is used, passthru means that an empty string is returned for these columns.
result_idThe result identifier.
If result_id is 0, the
settings apply as default for new results.
Note: Default for longreadlen is 4096 and
modedefaults to ODBC_BINMODE_RETURN. Handling of binary long columns is also affected by odbc_longreadlen().
mode
Possible values for mode are:
ODBC_BINMODE_PASSTHRU: Passthru BINARY data
ODBC_BINMODE_RETURN: Return as is
ODBC_BINMODE_CONVERT: Convert to char and return
成功时返回 TRUE， 或者在失败时返回 FALSE。