postgresqlHow do I store binary data in a Postgresql database using the bytea data type?
The bytea
data type is a binary data type in Postgresql which allows for the storage of binary data. To store binary data using the bytea
data type, the binary data must first be converted into a hexadecimal representation of the data. This can be done with the encode
function.
For example:
SELECT encode(E'\xDEADBEEF', 'hex');
This will output "DEADBEEF"
which is the hexadecimal representation of the binary data \xDEADBEEF
.
Once the data is in hexadecimal representation, it can be inserted into a bytea
column like so:
INSERT INTO mytable (mybyteacolumn) VALUES (decode('DEADBEEF', 'hex'));
This will insert the binary data \xDEADBEEF
into the mybyteacolumn
column of the mytable
table.
To retrieve the binary data, the encode
function can be used again:
SELECT encode(mybyteacolumn, 'hex') FROM mytable;
This will output the hexadecimal representation of the binary data stored in the mybyteacolumn
column.
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