How can I make an init.sql script run when using Docker with Postgresql? - postgresql

Question

I'm trying to run docker and postgresql. To do this, I have such a docker-compose.
version: '3'
services:
postgres:
image: postgres:12
restart: always
networks:
- backend
ports:
- '5432:5432'
volumes:
- ./db_data:/var/lib/postgresql/data
- ./app/config/init.sql:/docker-entrypoint-initdb.d/create_tables.sql
env_file:
- ./app/config/.env
healthcheck:
test: [ "CMD", "pg_isready", "-q", "-d", "devdb", "-U", "postgres" ]
timeout: 45s
interval: 10s
retries: 10
app:
build: app
ports:
- 3200:3200
networks:
- backend
depends_on:
postgres:
condition: service_healthy
volumes:
db_data:
networks:
backend:
driver: bridge
now I'm creating an init.sql file:
app/config/init.sql
CREATE TABLE todos(
id SERIAL PRIMARY KEY NOT NULL,
title VARCHAR NOT NULL,
description VARCHAR NOT NULL,
creating_time timestamp
);
I use the pgx driver to communicate with Postgresql:
insertQuery string = `INSERT INTO todos(title, description, creating_time) VALUES($1, $2, $3)`
dbUrl := fmt.Sprintf("postgres://%s:%s#%s:5432/%s", connInfo.User, connInfo.Password, connInfo.Host, connInfo.DBName)
db, errDB := pgxpool.Connect(context.Background(), dbUrl)
if errDB != nil {
fmt.Println(errDB)
}
conn, err := db.Acquire(context.Background())
if err != nil {
fmt.Errorf("Unable to acquire a database connection: %v\n", err)
}
defer conn.Release()
datetime := time.Now()
dt := datetime.Format(time.RFC3339)
_, err = db.Exec(context.Background(), insertQuery, "todo.Title", "todo.Description", dt)
if err != nil {
fmt.Println(err)
}
And when the container starts, everything goes fine until it comes to executing the request.
Then I get an error relation "todos" does not exist at character 13
I've never done this before, so I can't figure out what's wrong.The connection to the database is normal, since it does not issue an error, but for some reason the script for creating the table is not executed.I will be glad to help how to solve this problem.

Answer 1

how's going?
This entry point that you're configure would work only if does not exists any database configured. As you can see here. The main objective of this entry point is configure the database to be used, once this is already made does not make sense executing again.
My suggestion to you is use this lib. It is pretty straightforward to use it. If you want to, I can share some examples.
Please let me know if this helped you.