# odbc_binmode

(PHP 4, PHP 5, PHP 7)

odbc_binmode — Handling of binary column data

### 说明

odbc_binmode ( resource `$result_id` , int `$mode` ) : bool

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`。