update Readme

Author: David Arevalo

.gitignore

@@ -1 +1,2 @@
+.DS_Store
 postgres-data/*

README.md

@@ -1 +1,35 @@
-# docker_postgres_with_data
+## Creating and filling a Postgres DB with Docker Compose
+
+This project create tables and fill the tables in a Postgres data base. The tables and data that create are in sql/ folder
+## ER Diagram
+The ER Diagram of DB is this
+![ER Diagram](https://github.com/jdaarevalo/docker_postgres_with_data/images/ER_Diagram.png)
+
+## ER Diagram
+Set the variables in `sql/fill_tables.sql`
+| Parameter | Description |
+| ------ | ------ |
+| number_of_sales | Number of rows to create in the table sale |
+| number_of_users | Number of rows to create in the table users |
+| number_of_products | Number of rows to create in the table products |
+| number_of_stores | Number of rows to create in the table sale |
+| number_of_coutries | Number of rows to create in the table countries |
+| number_of_cities | Number of rows to create in the table cities |
+| number_of_status_names | Number of rows to create in the table status_names |
+| start_date | Date of the first sale |
+| end_date | Date of the last sale |
+
+## Params
+If want change this params in `docker-compose.yaml`
+| Parameter | Description |
+| ------ | ------ |
+| POSTGRES_USER | The Postgres user to connect **postgres** |
+| POSTGRES_PASSWORD | The Postgres password to connect **postgres** |
+| POSTGRES_DB | The Postgres password to connect **postgres** |
+| port | The port mapped by Postgres is **5432** in your container. In this example, use the port **5438** on the host machine |
+
+## Run
+```sh
+$ docker-compose up
+```
+

docker-compose.yml

@@ -16,6 +16,5 @@ services:
           - ./postgres-data:/var/lib/postgresql/data
           # copy the sql script to create tables
           - ./sql/create_tables.sql:/docker-entrypoint-initdb.d/create_tables.sql
-            #command: 
-            #- |
-            #psql -U postgres test -f '/sql/create_tables.sql'
+          # copy the sql script to fill tables
+          - ./sql/fill_tables.sql:/docker-entrypoint-initdb.d/fill_tables.sql

images/ER_Diagram.png

@@ -0,0 +1,71 @@
+-- Set params
+set session my.number_of_sales = '2000000';
+set session my.number_of_users = '500000';
+set session my.number_of_products = '300';
+set session my.number_of_stores = '500';
+set session my.number_of_coutries = '100';
+set session my.number_of_cities = '30';
+set session my.status_names = '5';
+set session my.start_date = '2019-01-01 00:00:00';
+set session my.end_date = '2020-02-01 00:00:00';
+
+-- load the pgcrypto extension to gen_random_uuid ()
+CREATE EXTENSION pgcrypto;
+
+-- Filling of products
+INSERT INTO product
+select id, concat('Product ', id) 
+FROM GENERATE_SERIES(1, current_setting('my.number_of_products')::int) as id;
+
+-- Filling of countries
+INSERT INTO country
+select id, concat('Country ', id) 
+FROM GENERATE_SERIES(1, current_setting('my.number_of_coutries')::int) as id;
+
+-- Filling of cities
+INSERT INTO city
+select id
+	, concat('City ', id)
+	, floor(random() * (current_setting('my.number_of_coutries')::int) + 1)::int
+FROM GENERATE_SERIES(1, current_setting('my.number_of_cities')::int) as id;
+
+-- Filling of stores
+INSERT INTO store
+select id
+	, concat('Store ', id)
+	, floor(random() * (current_setting('my.number_of_cities')::int) + 1)::int
+FROM GENERATE_SERIES(1, current_setting('my.number_of_stores')::int) as id;
+
+-- Filling of users
+INSERT INTO users
+select id
+	, concat('User ', id)
+FROM GENERATE_SERIES(1, current_setting('my.number_of_users')::int) as id;
+
+-- Filling of users
+INSERT INTO status_name
+select status_name_id
+	, concat('Status Name ', status_name_id)
+FROM GENERATE_SERIES(1, current_setting('my.status_names')::int) as status_name_id;
+
+-- Filling of sales  
+INSERT INTO sale
+select gen_random_uuid ()
+	, round(CAST(float8 (random() * 10000) as numeric), 3)
+	, TO_TIMESTAMP(start_date, 'YYYY-MM-DD HH24:MI:SS') +
+		random()* (TO_TIMESTAMP(end_date, 'YYYY-MM-DD HH24:MI:SS') 
+							- TO_TIMESTAMP(start_date, 'YYYY-MM-DD HH24:MI:SS'))
+	, floor(random() * (current_setting('my.number_of_products')::int) + 1)::int
+	, floor(random() * (current_setting('my.number_of_users')::int) + 1)::int
+	, floor(random() * (current_setting('my.number_of_stores')::int) + 1)::int
+FROM GENERATE_SERIES(1, current_setting('my.number_of_sales')::int) as id
+	, current_setting('my.start_date') as start_date
+	, current_setting('my.end_date') as end_date;
+
+-- Filling of order_status  
+INSERT INTO order_status
+select gen_random_uuid ()
+	, date_sale + random()* (date_sale + '5 days' - date_sale)
+	, sale_id
+	, floor(random() * (current_setting('my.status_names')::int) + 1)::int
+from sale;