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Connect with Go

This example connects to PostgreSQL® service from Go, making use of the pg library.

Variables

These are the placeholders you will need to replace in the code sample:

VariableDescription
POSTGRESQL_URIURL for PostgreSQL connection, from the service overview page

Prerequisites

For this example you will need:

  • The Go pq library:

    go get github.com/lib/pq
  • Download CA certificates from the service overview page, this example assumes it is in a local file called ca.pem.

Code

Add the following to main.go and replace the placeholder with the PostgreSQL URI:

package main

import (
"database/sql"
"fmt"
"log"
"net/url"

_ "github.com/lib/pq"
)

func main() {
serviceURI := "POSTGRESQL_URI"

conn, _ := url.Parse(serviceURI)
conn.RawQuery = "sslmode=verify-ca;sslrootcert=ca.pem"

db, err := sql.Open("postgres", conn.String())

if err != nil {
log.Fatal(err)
}
defer db.Close()

rows, err := db.Query("SELECT version()")
if err != nil {
panic(err)
}

for rows.Next() {
var result string
err = rows.Scan(&result)
if err != nil {
panic(err)
}
fmt.Printf("Version: %s\n", result)
}
}

This code creates a PostgreSQL client and opens a connection to the database. Then runs a query checking the database version and prints the response

note

This example replaces the query string parameter to specify sslmode=verify-ca to make sure that the SSL certificate is verified, and adds the location of the cert.

To run the code:

go run main.go

If the script runs successfully, the outputs should be the PostgreSQL version running in your service like:

Version: PostgreSQL 13.3 on x86_64-pc-linux-gnu, compiled by gcc, a 68c5366192 p 6520304dc1, 64-bit