orm: add mysql support (#9630)

* add mysql to orm

* fix got to big packet error

* format sql.v

* format example

* custom sql types

* add mysql table cration

* add documentation

* format sql.v

* fix markdown

* start implementing select_expr for mysql

* remove orm.c

* format sql.v

* finish mysql expr

* remove c

* remove unessecary files

* change to c implementation

* remove c

* added str interpolation for idents

* fix string insert

* fix compilation problems

* fix gitly compilation

* fix typing mistake

* add link to orm docs

examples/database/orm.v

@@ -1,16 +1,17 @@
 import sqlite
+import mysql
 
 struct Module {
-	id           int
+	id           int    [primary; sql: serial]
 	name         string
-	nr_downloads int
+	nr_downloads int    [sql: u64]
 	creator      User
 }
 
 struct User {
-	id             int
+	id             int    [primary; sql: serial]
 	age            int
-	name           string
+	name           string [nonull]
 	is_customer    bool
 	skipped_string string [skip]
 }
@@ -18,8 +19,9 @@ struct User {
 fn main() {
 	db := sqlite.connect(':memory:') or { panic(err) }
 	db.exec('drop table if exists User')
-	db.exec("create table Module (id integer primary key, name text default '', nr_downloads int default 0, creator int default 0);")
-	db.exec("create table User (id integer primary key, age int default 0, name text default '', is_customer int default 0);")
+	sql db {
+		create table Module
+	}
 
 	mod := Module{
 		name: 'test'
@@ -38,7 +40,41 @@ fn main() {
 		select from Module where id == 1
 	}
 
-	println(modul.name)
-	println(modul.creator.name)
+	eprintln(modul)
 
+	mysql()
+}
+
+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)
 }