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".

**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.

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。