From f5c4671bfbad96bf346bd7e9a21fc4317b4959df Mon Sep 17 00:00:00 2001
From: Indrajith K L
Date: Sat, 3 Dec 2022 17:00:20 +0530
Subject: Adds most of the tools

---
 v_windows/v/examples/database/mysql.v         |  17 ++
 v_windows/v/examples/database/orm.v           | 257 ++++++++++++++++++++++++++
 v_windows/v/examples/database/psql/.gitignore |   1 +
 v_windows/v/examples/database/psql/customer.v |  63 +++++++
 v_windows/v/examples/database/psql/mydb.sql   | 122 ++++++++++++
 v_windows/v/examples/database/sqlite.v        |  22 +++
 6 files changed, 482 insertions(+)
 create mode 100644 v_windows/v/examples/database/mysql.v
 create mode 100644 v_windows/v/examples/database/orm.v
 create mode 100644 v_windows/v/examples/database/psql/.gitignore
 create mode 100644 v_windows/v/examples/database/psql/customer.v
 create mode 100644 v_windows/v/examples/database/psql/mydb.sql
 create mode 100644 v_windows/v/examples/database/sqlite.v

(limited to 'v_windows/v/examples/database')

diff --git a/v_windows/v/examples/database/mysql.v b/v_windows/v/examples/database/mysql.v
new file mode 100644
index 0000000..97e0888
--- /dev/null
+++ b/v_windows/v/examples/database/mysql.v
@@ -0,0 +1,17 @@
+import mysql
+
+fn main() {
+	mut conn := mysql.Connection{
+		host: 'localhost'
+		port: 3306
+		username: 'root'
+		password: ''
+		dbname: 'mysql'
+	}
+	conn.connect() ?
+	res := conn.query('show tables') ?
+	for row in res.rows() {
+		println(row.vals.join(', '))
+	}
+	conn.close()
+}
diff --git a/v_windows/v/examples/database/orm.v b/v_windows/v/examples/database/orm.v
new file mode 100644
index 0000000..b308e91
--- /dev/null
+++ b/v_windows/v/examples/database/orm.v
@@ -0,0 +1,257 @@
+import sqlite
+import mysql
+import pg
+
+[table: 'modules']
+struct Module {
+	id           int    [primary; sql: serial]
+	name         string
+	nr_downloads int    [sql: u64]
+	creator      User
+}
+
+struct User {
+	id             int    [primary; sql: serial]
+	age            int    [unique: 'user']
+	name           string [sql: 'username'; unique]
+	is_customer    bool   [sql: 'abc'; unique: 'user']
+	skipped_string string [skip]
+}
+
+struct Parent {
+	id       int     [primary; sql: serial]
+	name     string
+	children []Child [fkey: 'parent_id']
+}
+
+struct Child {
+	id        int    [primary; sql: serial]
+	parent_id int
+	name      string
+}
+
+fn main() {
+	sqlite3_array()
+	mysql_array()
+	psql_array()
+
+	sqlite3()
+	mysql()
+	psql()
+}
+
+fn sqlite3_array() {
+	mut db := sqlite.connect(':memory:') or { panic(err) }
+	sql db {
+		create table Parent
+	}
+
+	par := Parent{
+		name: 'test'
+		children: [
+			Child{
+				name: 'abc'
+			},
+			Child{
+				name: 'def'
+			},
+		]
+	}
+
+	sql db {
+		insert par into Parent
+	}
+
+	parent := sql db {
+		select from Parent where id == 1
+	}
+
+	sql db {
+		drop table Parent
+	}
+
+	eprintln(parent)
+}
+
+fn mysql_array() {
+	mut db := mysql.Connection{
+		host: 'localhost'
+		port: 3306
+		username: 'root'
+		password: 'abc'
+		dbname: 'test'
+	}
+	db.connect() or { panic(err) }
+
+	sql db {
+		create table Parent
+	}
+
+	par := Parent{
+		name: 'test'
+		children: [
+			Child{
+				name: 'abc'
+			},
+			Child{
+				name: 'def'
+			},
+		]
+	}
+
+	sql db {
+		insert par into Parent
+	}
+
+	parent := sql db {
+		select from Parent where id == 1
+	}
+
+	eprintln(parent)
+
+	sql db {
+		drop table Parent
+	}
+
+	db.close()
+}
+
+fn psql_array() {
+	mut db := pg.connect(host: 'localhost', user: 'test', password: 'abc', dbname: 'test') or {
+		panic(err)
+	}
+
+	sql db {
+		create table Parent
+	}
+
+	par := Parent{
+		name: 'test'
+		children: [
+			Child{
+				name: 'abc'
+			},
+			Child{
+				name: 'def'
+			},
+		]
+	}
+
+	sql db {
+		insert par into Parent
+	}
+
+	parent := sql db {
+		select from Parent where id == 1
+	}
+
+	eprintln(parent)
+
+	sql db {
+		drop table Parent
+	}
+
+	db.close()
+}
+
+fn sqlite3() {
+	mut db := sqlite.connect(':memory:') or { panic(err) }
+	sql db {
+		create table Module
+	}
+
+	mod := Module{
+		name: 'test'
+		nr_downloads: 10
+		creator: User{
+			age: 21
+			name: 'VUser'
+			is_customer: true
+		}
+	}
+	sql db {
+		insert mod into Module
+	}
+
+	modul := sql db {
+		select from Module where id == 1
+	}
+
+	sql db {
+		drop table Module
+	}
+
+	eprintln(modul)
+	db.close() or { panic(err) }
+}
+
+fn mysql() {
+	mut conn := mysql.Connection{
+		host: 'localhost'
+		port: 3306
+		username: 'root'
+		password: 'abc'
+		dbname: 'test'
+	}
+	conn.connect() or { panic(err) }
+
+	sql conn {
+		create table Module
+	}
+
+	mod := Module{
+		name: 'test'
+		nr_downloads: 10
+		creator: User{
+			age: 21
+			name: 'VUser'
+			is_customer: true
+		}
+	}
+
+	sql conn {
+		insert mod into Module
+	}
+
+	m := sql conn {
+		select from Module where id == 1
+	}
+
+	eprintln(m)
+	conn.close()
+}
+
+fn psql() {
+	mut db := pg.connect(host: 'localhost', user: 'test', password: 'abc', dbname: 'test') or {
+		panic(err)
+	}
+
+	mod := Module{
+		name: 'test'
+		nr_downloads: 10
+		creator: User{
+			age: 21
+			name: 'VUser'
+			is_customer: true
+		}
+	}
+
+	sql db {
+		create table Module
+	}
+
+	sql db {
+		insert mod into Module
+	}
+
+	modul := sql db {
+		select from Module where id == 1
+	}
+
+	sql db {
+		drop table Module
+	}
+
+	eprintln(modul)
+	db.close()
+}
diff --git a/v_windows/v/examples/database/psql/.gitignore b/v_windows/v/examples/database/psql/.gitignore
new file mode 100644
index 0000000..23830aa
--- /dev/null
+++ b/v_windows/v/examples/database/psql/.gitignore
@@ -0,0 +1 @@
+customer
diff --git a/v_windows/v/examples/database/psql/customer.v b/v_windows/v/examples/database/psql/customer.v
new file mode 100644
index 0000000..4538a94
--- /dev/null
+++ b/v_windows/v/examples/database/psql/customer.v
@@ -0,0 +1,63 @@
+module main
+
+import pg
+
+const dash = '----------------------------------------------------------------'
+
+struct Customer {
+	id        int
+	name      string
+	nr_orders int
+	country   string
+}
+
+fn main() {
+	/*
+	db := pg.connect(pg.Config{
+		host: 'localhost' //'127.0.0.1'
+		user: 'postgres'
+		dbname: 'customerdb'
+	}) or {
+		println('failed to connect')
+		println(err)
+		return
+	}
+
+	nr_customers := db.select count from Customer
+	println('Total customers: $nr_customers')
+
+	// V syntax can be used to build queries
+	println(dash)
+	bg_country := 'Bulgaria'
+	bg_customers := db.select from Customer where country == bg_country  && id != 2
+	for customer in bg_customers {
+		println('$customer.country | $customer.id - $customer.name')
+	}
+
+	println(dash)
+	ru_customers := db.select from Customer where country == 'Russia'
+	for customer in ru_customers {
+		println('$customer.country | $customer.id - $customer.name')
+	}
+
+	// by adding `limit 1` we tell V that there will be only one object
+	println(dash)
+	existing := db.select from Customer where id == 1 limit 1 or { panic(err) }
+	println('Existing customer name: $existing.name')
+	println('Existing customer full information:')
+	println(existing)
+
+	println(dash)
+	q := Customer{}
+	// It's easy to handle queries that don't return any data
+	if anon := db.select from Customer where id == 12345 && name == q.name &&
+			nr_orders > q.nr_orders limit 1 {
+		println('Non existing customer name: $anon.name')
+	}
+	// Insert a new customer
+	nc := Customer{
+		name: 'John Doe'
+		nr_orders: 10
+	}
+	db.insert(nc)*/
+}
diff --git a/v_windows/v/examples/database/psql/mydb.sql b/v_windows/v/examples/database/psql/mydb.sql
new file mode 100644
index 0000000..a7cbb39
--- /dev/null
+++ b/v_windows/v/examples/database/psql/mydb.sql
@@ -0,0 +1,122 @@
+--
+-- PostgreSQL database dump
+--
+
+-- Dumped from database version 9.5.19
+-- Dumped by pg_dump version 9.5.19
+
+SET statement_timeout = 0;
+SET lock_timeout = 0;
+SET client_encoding = 'UTF8';
+SET standard_conforming_strings = on;
+SELECT pg_catalog.set_config('search_path', '', false);
+SET check_function_bodies = false;
+SET xmloption = content;
+SET client_min_messages = warning;
+SET row_security = off;
+
+--
+-- Name: plpgsql; Type: EXTENSION; Schema: -; Owner: 
+--
+
+CREATE EXTENSION IF NOT EXISTS plpgsql WITH SCHEMA pg_catalog;
+
+
+--
+-- Name: EXTENSION plpgsql; Type: COMMENT; Schema: -; Owner: 
+--
+
+COMMENT ON EXTENSION plpgsql IS 'PL/pgSQL procedural language';
+
+
+SET default_tablespace = '';
+
+SET default_with_oids = false;
+
+--
+-- Name: customers; Type: TABLE; Schema: public; Owner: myuser
+--
+
+CREATE TABLE public.customers (
+    id integer NOT NULL,
+    name text DEFAULT ''::text,
+    nr_orders integer DEFAULT 0,
+    country text DEFAULT 'England'::text,
+    created_at timestamp without time zone DEFAULT now()
+);
+
+
+ALTER TABLE public.customers OWNER TO myuser;
+
+--
+-- Name: customers_id_seq; Type: SEQUENCE; Schema: public; Owner: myuser
+--
+
+CREATE SEQUENCE public.customers_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+ALTER TABLE public.customers_id_seq OWNER TO myuser;
+
+--
+-- Name: customers_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: myuser
+--
+
+ALTER SEQUENCE public.customers_id_seq OWNED BY public.customers.id;
+
+
+--
+-- Name: id; Type: DEFAULT; Schema: public; Owner: myuser
+--
+
+ALTER TABLE ONLY public.customers ALTER COLUMN id SET DEFAULT nextval('public.customers_id_seq'::regclass);
+
+
+--
+-- Data for Name: customers; Type: TABLE DATA; Schema: public; Owner: myuser
+--
+
+COPY public.customers (id, name, nr_orders, country, created_at) FROM stdin;
+2	Pippi Långstrump	3	Bulgaria	2019-08-19 09:41:30.78888
+1	Bilbo Begins	11	Bulgaria	2019-08-19 09:40:31.396807
+3	Viktualia Rullgardina	0	Bulgaria	2019-08-19 09:42:52.723223
+4	Krusmynta Efraimsdotter	5	Bulgaria	2019-08-19 09:43:04.083209
+5	Ana Karenina	0	Russia	2019-08-20 15:41:50.244971
+7	Jiji Lolobridgida	0	Italy	2019-08-20 15:42:26.020113
+6	Viktor Savashkin	8	Russia	2019-08-20 15:42:07.213557
+\.
+
+
+--
+-- Name: customers_id_seq; Type: SEQUENCE SET; Schema: public; Owner: myuser
+--
+
+SELECT pg_catalog.setval('public.customers_id_seq', 1, true);
+
+
+--
+-- Name: customers_pkey; Type: CONSTRAINT; Schema: public; Owner: myuser
+--
+
+ALTER TABLE ONLY public.customers
+    ADD CONSTRAINT customers_pkey PRIMARY KEY (id);
+
+
+--
+-- Name: SCHEMA public; Type: ACL; Schema: -; Owner: postgres
+--
+
+REVOKE ALL ON SCHEMA public FROM PUBLIC;
+REVOKE ALL ON SCHEMA public FROM postgres;
+GRANT ALL ON SCHEMA public TO postgres;
+GRANT ALL ON SCHEMA public TO PUBLIC;
+
+
+--
+-- PostgreSQL database dump complete
+--
+
diff --git a/v_windows/v/examples/database/sqlite.v b/v_windows/v/examples/database/sqlite.v
new file mode 100644
index 0000000..a3c7176
--- /dev/null
+++ b/v_windows/v/examples/database/sqlite.v
@@ -0,0 +1,22 @@
+import sqlite
+
+fn main() {
+	db := sqlite.connect(':memory:') ?
+	db.exec("create table users (id integer primary key, name text default '');")
+
+	db.exec("insert into users (name) values ('Sam')")
+	db.exec("insert into users (name) values ('Peter')")
+	db.exec("insert into users (name) values ('Kate')")
+
+	nr_users := db.q_int('select count(*) from users')
+	println('nr users = $nr_users')
+
+	name := db.q_string('select name from users where id = 1')
+	assert name == 'Sam'
+
+	users, code := db.exec('select * from users')
+	println('SQL Result code: $code')
+	for row in users {
+		println(row.vals)
+	}
+}
-- 
cgit v1.2.3