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Documentation
/ SQL
/ Functions
Blob Functions
This section describes functions and operators for examining and manipulating BLOB values.
| Name | Description |
|---|---|
blob || blob |
BLOB concatenation. |
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. |
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. |
blob || blob
| Description | BLOB concatenation. |
| Example | '\xAA'::BLOB || '\xBB'::BLOB |
| Result | \xAA\xBB |
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 |
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 |