Inserting text string with hex into PostgreSQL as a bytea

Question

I have a text file with several strings of hex in it:

013d7d16d7ad4fefb61bd95b765c8ceb
007687fc64b746569616414b78c81ef1

I would like to sto

Answer 1

The Ruby Way

I recently needed to read/write binary data from/to Postgres, but via Ruby. Here's how I did it using the Pg library.

Although not strictly Postgres-specific, I thought I'd include this Ruby-centric answer for reference.

Postgres DB Setup

require 'pg'
DB = PG::Connection.new(host: 'localhost', dbname:'test')
DB.exec "CREATE TABLE mytable (testcol BYTEA)"
BINARY = 1

Insert Binary Data

sql = "INSERT INTO mytable (testcol) VALUES ($1)"
param = {value: binary_data, format: BINARY}
DB.exec_params(sql, [param]) {|res| res.cmd_tuples == 1 }

Select Binary Data

sql = "SELECT testcol FROM mytable LIMIT 1"
DB.exec_params(sql, [], BINARY) {|res| res.getvalue(0,0) }