Initial project import
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// vtest build: !(macos || windows)
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import os
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import db.sqlite
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import db.mysql
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import db.pg
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// The goal of this example, is to show how you can connect to
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// several different databases in the same program, and use both
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// the ORM and the native connection wrapper, that each DB driver
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// provides, if you need to execute more complex SQL queries.
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//
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// You can use environment variables to pass your local DB connection
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// settings, without editing the code, like this:
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//
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// MUSER='myuser' MPASS='abc' MDATABASE='vtestdb' PGUSER='postgres' PGPASS='password' PGDATABASE='postgres' ./v -g run examples/database/orm.v
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//
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// WARNING: this example will drop and re-create any tables named:
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// * modules
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// * User
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// * Parent
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// * Child
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// in the passed databases, so it is better to use empty DBs for it.
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const mysql_host = os.getenv_opt('MHOST') or { 'localhost' }
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const mysql_port = os.getenv_opt('MPORT') or { '3306' }.u32()
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const mysql_user = os.getenv_opt('MUSER') or { 'myuser' }
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const mysql_pass = os.getenv_opt('MPASS') or { 'abc' }
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const mysql_db = os.getenv_opt('MDATABASE') or { 'test' }
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const pg_host = os.getenv_opt('PGHOST') or { 'localhost' }
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const pg_user = os.getenv_opt('PGUSER') or { 'test' }
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const pg_pass = os.getenv_opt('PGPASS') or { 'abc' }
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const pg_db = os.getenv_opt('PGDATABASE') or { 'test' }
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@[table: 'modules']
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struct Module {
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id int @[primary; sql: serial]
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name string
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nr_downloads int @[sql: u64]
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creator User
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}
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struct User {
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id int @[primary; sql: serial]
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age u32 @[unique: 'user']
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name string @[sql: 'username'; sql_type: 'VARCHAR(200)'; unique]
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is_customer bool @[sql: 'abc'; unique: 'user']
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skipped_string string @[skip]
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}
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struct Parent {
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id int @[primary; sql: serial]
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name string
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children []Child @[fkey: 'parent_id']
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}
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struct Child {
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id int @[primary; sql: serial]
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parent_id int
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name string
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}
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fn sqlite3_array() ! {
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eprintln('------------ ${@METHOD} -----------------')
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mut db := sqlite.connect(':memory:')!
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defer {
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sql db {
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drop table Parent
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drop table Child
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} or {}
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db.close() or {}
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}
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sql db {
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create table Parent
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}!
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sql db {
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create table Child
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}!
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par := Parent{
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name: 'test'
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children: [
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Child{
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name: 'abc'
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},
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Child{
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name: 'def'
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},
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]
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}
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sql db {
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insert par into Parent
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}!
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parent := sql db {
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select from Parent where id == 1
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}!
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eprintln(parent)
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}
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fn msql_array() ! {
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eprintln('------------ ${@METHOD} -----------------')
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mut db := mysql.connect(
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host: mysql_host
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port: mysql_port
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username: mysql_user
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password: mysql_pass
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dbname: mysql_db
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)!
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defer {
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sql db {
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drop table Parent
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} or {}
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db.close() or {}
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}
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db.query('drop table if exists Parent')!
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db.query('drop table if exists Child')!
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sql db {
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create table Parent
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create table Child
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}!
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par := Parent{
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name: 'test'
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children: [
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Child{
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name: 'abc'
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},
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Child{
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name: 'def'
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},
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]
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}
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sql db {
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insert par into Parent
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}!
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parent := sql db {
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select from Parent where id == 1
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}!
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eprintln(parent)
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}
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fn psql_array() ! {
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eprintln('------------ ${@METHOD} -----------------')
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mut db := pg.connect(host: pg_host, user: pg_user, password: pg_pass, dbname: pg_db)!
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defer {
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db.exec_one('drop table if exists "Parent", "Child"') or { eprintln(err) }
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db.close() or {}
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}
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db.exec_one('drop table if exists "Parent", "Child"') or { eprintln(err) }
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sql db {
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create table Parent
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create table Child
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}!
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par := Parent{
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name: 'test'
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children: [
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Child{
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name: 'abc'
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},
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Child{
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name: 'def'
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},
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]
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}
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sql db {
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insert par into Parent
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}!
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parent := sql db {
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select from Parent where id == 1
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}!
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eprintln(parent)
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}
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fn sqlite3() ! {
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eprintln('------------ ${@METHOD} -----------------')
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mut db := sqlite.connect(':memory:')!
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defer {
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sql db {
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drop table Module
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drop table User
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} or {}
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db.close() or {}
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}
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sql db {
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create table Module
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}!
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sql db {
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create table User
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}!
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mod := Module{
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name: 'test'
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nr_downloads: 10
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creator: User{
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age: 21
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name: 'VUser'
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is_customer: true
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}
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}
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sql db {
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insert mod into Module
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}!
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modul := sql db {
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select from Module where id == 1
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}!
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eprintln(modul)
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}
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fn msql() ! {
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eprintln('------------ ${@METHOD} -----------------')
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mut conn := mysql.connect(
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host: mysql_host
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port: mysql_port
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username: mysql_user
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password: mysql_pass
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dbname: mysql_db
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)!
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defer {
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conn.query('DROP TABLE IF EXISTS Module') or { eprintln(err) }
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conn.query('DROP TABLE IF EXISTS User') or { eprintln(err) }
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conn.close() or {}
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}
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conn.query('DROP TABLE IF EXISTS Module') or { eprintln(err) }
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conn.query('DROP TABLE IF EXISTS User') or { eprintln(err) }
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sql conn {
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create table Module
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}!
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sql conn {
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create table User
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}!
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mod := Module{
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name: 'test'
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nr_downloads: 10
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creator: User{
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age: 21
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name: 'VUser'
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is_customer: true
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}
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}
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sql conn {
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insert mod into Module
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}!
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m := sql conn {
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select from Module where id == 1
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}!
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eprintln(m)
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}
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fn psql() ! {
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eprintln('------------ ${@METHOD} -----------------')
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mut db := pg.connect(host: pg_host, user: pg_user, password: pg_pass, dbname: pg_db)!
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defer {
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db.exec_one('drop table if exists "modules", "User"') or { eprintln(err) }
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db.close() or {}
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}
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db.exec_one('drop table if exists "modules", "User"') or { eprintln(err) }
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sql db {
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create table Module
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create table User
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}!
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mod := Module{
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name: 'test'
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nr_downloads: 10
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creator: User{
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age: 21
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name: 'VUser'
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is_customer: true
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}
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}
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sql db {
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insert mod into Module
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}!
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modul := sql db {
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select from Module where id == 1
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}!
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sql db {
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drop table Module
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}!
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eprintln(modul)
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}
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fn main() {
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eprintln('------------ ${@METHOD} -----------------')
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sqlite3_array()!
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msql_array()!
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psql_array()!
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sqlite3()!
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msql()!
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psql()!
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}
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