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# pg_unescape_bytea

(no version information, might be only in CVS)

pg_unescape_bytea -- Escape binary for bytea type

## Description

string pg_unescape_bytea ( string data)

pg_unescape_bytea() unescapes string from bytea datatype. It returns unescaped string (binary).

> 注意 When you SELECT bytea type, PostgreSQL returns octal byte value prefixed by \ (e.g. \032). Users are supposed to convert back to binary format by yourself.

> This function requires PostgreSQL 7.2 or later. With PostgreSQL 7.2.0 and 7.2.1, bytea type must be casted when you enable multi-byte support. i.e. `INSERT INTO test_table (image) VALUES ('$image_escaped'::bytea);` PostgreSQL 7.2.2 or later does not need cast. Exception is when client and backend character encoding does not match, there may be multi-byte stream error. User must cast to bytea to avoid this error.

See also pg_escape_bytea() and pg_escape_string()

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