odbc_binmode
(PHP 4, PHP 5)
odbc_binmode — Handling of binary column data
说明
bool odbc_binmode ( resource $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.
参数
- result_id
-
The result identifier.
If result_id is 0, the settings apply as default for new results.
Note: Default for longreadlen is 4096 and mode defaults 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
返回值
成功时返回 TRUE， 或者在失败时返回 FALSE.
