PHP. Руководство по PHP. 2005
odbc_binmode
odbc_binmode
Description
bool odbc_binmode (resource result_id, int mode)(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 111 is
converted to "FF".
Таблица 1. LONGVARBINARY handling
| 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.
If result_id is 0, the
settings apply as default for new results.
Замечание:
Default for longreadlen is 4096 and binmode
defaults to ODBC_BINMODE_RETURN. Handling
of binary long columns is also affected by
odbc_autocommit
odbc_close_all
