orm: allow both integer and string arguments in db.select and db.select limit 1
Delyan Angelov
Alexander Medvednikov
parent
900df8ecf9
commit
cf06faf09b
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@ -84,7 +84,7 @@ mut:
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is_vweb bool
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is_sql bool
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sql_i int // $1 $2 $3
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sql_params string // ("select * from users where id = $1", ***"100"***)
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sql_params []string // ("select * from users where id = $1", ***"100"***)
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}
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const (
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@ -1400,7 +1400,7 @@ fn (p mut Parser) bterm() string {
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p.gen('$' + p.sql_i.str())
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p.cgen.start_cut()
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p.check_types(p.expression(), typ)
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p.sql_params = p.sql_params + p.cgen.cut() + ','
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p.sql_params << p.cgen.cut()
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//println('sql params = "$p.sql_params"')
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} else {
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p.check_types(p.expression(), typ)
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@ -6,13 +6,27 @@ module main
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import strings
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fn sql_params2params_gen(sql_params []string, qprefix string) string {
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mut params_gen := ''
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for i, mparam in sql_params {
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param := mparam.trim(` `)
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if param[0].is_digit() {
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params_gen += '${qprefix}params[$i] = int_str($param).str;\n'
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}else{
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sparam := param.trim(`\'`)
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params_gen += '${qprefix}params[$i] = "$sparam";\n'
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}
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}
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return params_gen
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}
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// `db.select from User where id == 1 && nr_bookings > 0`
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fn (p mut Parser) select_query(fn_ph int) string {
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// NB: qprefix, p.sql_i, p.sql_params SHOULD be reset for each query,
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// because we can have many queries in the _same_ scope.
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qprefix := p.get_tmp().replace('tmp','sql') + '_'
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p.sql_i = 0
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p.sql_params = ''
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p.sql_params = []string
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mut q := 'select '
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p.check(.key_select)
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@ -103,11 +117,7 @@ fn (p mut Parser) select_query(fn_ph int) string {
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}
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// One object
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if query_one {
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mut params_gen := ''
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params := p.sql_params.split(',')
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for i, param in params {
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params_gen += '${qprefix}params[$i] = int_str($param).str;'
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}
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mut params_gen := sql_params2params_gen( p.sql_params, qprefix )
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p.cgen.insert_before('
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char* ${qprefix}params[$p.sql_i];
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@ -132,11 +142,7 @@ ${obj_gen.str()}
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// Array
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else {
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q += ' order by id'
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mut params_gen := ''
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params := p.sql_params.split(',')
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for i, param in params {
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params_gen += '${qprefix}params[$i] = int_str($param).str;'
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}
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params_gen := sql_params2params_gen( p.sql_params, qprefix )
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p.cgen.insert_before('char* ${qprefix}params[$p.sql_i];
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$params_gen
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@ -159,7 +165,10 @@ for (int i = 0; i < ${qprefix}rows.len; i++) {
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if n == 'count' {
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return 'int'
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} else if query_one {
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return 'Option_$table_name'
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opt_type := 'Option_$table_name'
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p.cgen.typedefs << 'typedef Option $opt_type;'
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p.table.register_type( opt_type )
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return opt_type
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} else {
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p.register_array('array_$table_name')
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return 'array_$table_name'
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@ -0,0 +1,55 @@
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module main
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import pg
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struct Customer {
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id int
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name string
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nr_orders int
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country string
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}
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fn main() {
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db := pg.connect(pg.Config{host: '127.0.0.1' user: 'myuser' dbname: 'mydb'})
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nr_customers := db.select count from Customer
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println('Total customers: $nr_customers')
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// V syntax can be used to build queries
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println('------------------------------------------------------------------------')
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bg_customers := db.select from Customer where country = 'Bulgaria' && id != 2
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for customer in bg_customers {
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println('$customer.country | $customer.id - $customer.name')
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}
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println('------------------------------------------------------------------------')
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ru_customers := db.select from Customer where country = 'Russia'
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for customer in ru_customers {
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println('$customer.country | $customer.id - $customer.name')
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}
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// by adding `limit 1` we tell V that there will be only one object
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println('------------------------------------------------------------------------')
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existing := db.select from Customer where id = 1 limit 1 or { panic(err) }
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println('Existing customer name: $existing.name')
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println('Existing customer full information:')
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println(existing)
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println('------------------------------------------------------------------------')
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q := Customer{}
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for {
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anon := db.select from Customer where id = 12345 && nr_orders > q.nr_orders limit 1 or { eprintln('No such customer. Error: $err') break }
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println('Non existing customer name: $anon.name')
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break
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}
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// TODO: insert a new customer
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/*
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nc := Customer{
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name: 'John Doe'
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nr_orders: 10
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}
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db.insert(nc)
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*/
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}
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@ -0,0 +1,122 @@
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--
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-- PostgreSQL database dump
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--
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-- Dumped from database version 9.5.19
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-- Dumped by pg_dump version 9.5.19
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SET statement_timeout = 0;
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SET lock_timeout = 0;
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SET client_encoding = 'UTF8';
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SET standard_conforming_strings = on;
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SELECT pg_catalog.set_config('search_path', '', false);
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SET check_function_bodies = false;
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SET xmloption = content;
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SET client_min_messages = warning;
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SET row_security = off;
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--
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-- Name: plpgsql; Type: EXTENSION; Schema: -; Owner:
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--
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CREATE EXTENSION IF NOT EXISTS plpgsql WITH SCHEMA pg_catalog;
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--
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-- Name: EXTENSION plpgsql; Type: COMMENT; Schema: -; Owner:
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--
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COMMENT ON EXTENSION plpgsql IS 'PL/pgSQL procedural language';
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SET default_tablespace = '';
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SET default_with_oids = false;
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--
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-- Name: customer; Type: TABLE; Schema: public; Owner: myuser
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--
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CREATE TABLE public.customer (
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id integer NOT NULL,
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name text DEFAULT ''::text,
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nr_orders integer DEFAULT 0,
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country text DEFAULT 'England'::text,
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created_at timestamp without time zone DEFAULT now()
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);
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ALTER TABLE public.customer OWNER TO myuser;
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--
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-- Name: customer_id_seq; Type: SEQUENCE; Schema: public; Owner: myuser
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--
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CREATE SEQUENCE public.customer_id_seq
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START WITH 1
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INCREMENT BY 1
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NO MINVALUE
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NO MAXVALUE
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CACHE 1;
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ALTER TABLE public.customer_id_seq OWNER TO myuser;
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--
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-- Name: customer_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: myuser
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--
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ALTER SEQUENCE public.customer_id_seq OWNED BY public.customer.id;
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--
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-- Name: id; Type: DEFAULT; Schema: public; Owner: myuser
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--
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ALTER TABLE ONLY public.customer ALTER COLUMN id SET DEFAULT nextval('public.customer_id_seq'::regclass);
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--
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-- Data for Name: customer; Type: TABLE DATA; Schema: public; Owner: myuser
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--
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COPY public.customer (id, name, nr_orders, country, created_at) FROM stdin;
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2 Pippi Långstrump 3 Bulgaria 2019-08-19 09:41:30.78888
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1 Bilbo Begins 11 Bulgaria 2019-08-19 09:40:31.396807
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3 Viktualia Rullgardina 0 Bulgaria 2019-08-19 09:42:52.723223
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4 Krusmynta Efraimsdotter 5 Bulgaria 2019-08-19 09:43:04.083209
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5 Ana Karenina 0 Russia 2019-08-20 15:41:50.244971
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7 Jiji Lolobridgida 0 Italy 2019-08-20 15:42:26.020113
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6 Viktor Savashkin 8 Russia 2019-08-20 15:42:07.213557
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\.
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--
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-- Name: customer_id_seq; Type: SEQUENCE SET; Schema: public; Owner: myuser
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--
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SELECT pg_catalog.setval('public.customer_id_seq', 1, true);
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--
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-- Name: customer_pkey; Type: CONSTRAINT; Schema: public; Owner: myuser
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--
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ALTER TABLE ONLY public.customer
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ADD CONSTRAINT customer_pkey PRIMARY KEY (id);
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--
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-- Name: SCHEMA public; Type: ACL; Schema: -; Owner: postgres
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--
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REVOKE ALL ON SCHEMA public FROM PUBLIC;
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REVOKE ALL ON SCHEMA public FROM postgres;
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GRANT ALL ON SCHEMA public TO postgres;
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GRANT ALL ON SCHEMA public TO PUBLIC;
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--
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-- PostgreSQL database dump complete
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--
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