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Blob Functions

This section describes functions and operators for examining and manipulating BLOB values.

Name Description
blob || blob BLOB concatenation.
base64(blob) Converts a blob to a base64 encoded string.
decode(blob) Converts blob to VARCHAR. Fails if blob is not valid UTF-8.
encode(string) Converts the string to BLOB. Converts UTF-8 characters into literal encoding.
from_base64(string) Converts a base64 encoded string to a character string (BLOB).
from_binary(value) Converts a value from binary representation to a blob.
from_hex(value) Converts a value from hexadecimal representation to a blob.
hex(blob) Converts blob to VARCHAR using hexadecimal encoding.
octet_length(blob) Number of bytes in blob.
read_blob(source) Returns the content from source (a filename, a list of filenames, or a glob pattern) as a BLOB. See the read_blob guide for more details.
to_base64(blob) Converts a blob to a base64 encoded string.
to_hex(blob) Converts blob to VARCHAR using hexadecimal encoding.
unbin(value) Converts a value from binary representation to a blob.
unhex(value) Converts a value from hexadecimal representation to a blob.

blob || blob

Description BLOB concatenation.
Example '\xAA'::BLOB || '\xBB'::BLOB
Result \xAA\xBB

base64(blob)

Description Converts a blob to a base64 encoded string.
Example base64('A'::BLOB)
Result QQ==

decode(blob)

Description Convert blob to VARCHAR. Fails if blob is not valid UTF-8.
Example decode('\xC3\xBC'::BLOB)
Result ü

encode(string)

Description Converts the string to BLOB. Converts UTF-8 characters into literal encoding.
Example encode('my_string_with_ü')
Result my_string_with_\xC3\xBC

from_base64(string)

Description Converts a base64 encoded string to a character string (BLOB).
Example from_base64('QQ==')
Result A

from_binary(value)

Description Converts a value from binary representation to a blob.
Example unbin('0110')
Result \x06

from_hex(value)

Description Converts a value from hexadecimal representation to a blob.
Example unhex('2A')
Result *

hex(blob)

Description Converts blob to VARCHAR using hexadecimal encoding.
Example hex('\xAA\xBB'::BLOB)
Result AABB

octet_length(blob)

Description Number of bytes in blob.
Example octet_length('\xAA\xBB'::BLOB)
Result 2

read_blob(source)

Description Returns the content from source (a filename, a list of filenames, or a glob pattern) as a BLOB. See the read_blob guide for more details.
Example read_blob('hello.bin')
Result hello\x0A

to_base64(blob)

Description Converts a blob to a base64 encoded string.
Example base64('A'::BLOB)
Result QQ==

to_hex(blob)

Description Converts blob to VARCHAR using hexadecimal encoding.
Example hex('\xAA\xBB'::BLOB)
Result AABB

unbin(value)

Description Converts a value from binary representation to a blob.
Example unbin('0110')
Result \x06

unhex(value)

Description Converts a value from hexadecimal representation to a blob.
Example unhex('2A')
Result *
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