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// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module main
import strings
fn sql_params2params_gen(sql_params []string, sql_types []string, qprefix string) string {
mut params_gen := ''
for i, mparam in sql_params {
param := mparam.trim_space()
paramtype := sql_types[ i ]
if param[0].is_digit() {
params_gen += '${qprefix}params[$i] = int_str($param).str;\n'
}else if param[0] == `\'` {
sparam := param.trim('\'')
params_gen += '${qprefix}params[$i] = "$sparam";\n'
} else {
// A variable like q.nr_orders
if paramtype == 'int' {
params_gen += '${qprefix}params[$i] = int_str( $param ).str;\n'
}else if paramtype == 'string' {
params_gen += '${qprefix}params[$i] = ${param}.str;\n'
}else{
panic('orm: only int and string variable types are supported in queries')
}
}
}
//println('>>>>>>>> params_gen')
//println( params_gen )
return params_gen
}
// `db.select from User where id == 1 && nr_bookings > 0`
fn (p mut Parser) select_query(fn_ph int) string {
// NB: qprefix and { p.sql_i, p.sql_params, p.sql_types } SHOULD be reset for each query,
// because we can have many queries in the _same_ scope.
qprefix := p.get_tmp().replace('tmp','sql') + '_'
p.sql_i = 0
p.sql_params = []string
p.sql_types = []string
mut q := 'select '
p.check(.key_select)
n := p.check_name()
if n == 'count' {
q += 'count(*) from '
p.check_name()
}
table_name := p.check_name()
// Register this type's fields as variables so they can be used in where expressions
typ := p.table.find_type(table_name)
if typ.name == '' {
p.error('unknown type `$table_name`')
}
//fields := typ.fields.filter(typ == 'string' || typ == 'int')
// get only string and int fields
mut fields := []Var
for i, field in typ.fields {
if field.typ != 'string' && field.typ != 'int' {
continue
}
fields << field
}
if fields.len == 0 {
p.error('V orm: select: empty fields in `$table_name`')
}
if fields[0].name != 'id' {
p.error('V orm: `id int` must be the first field in `$table_name`')
}
// 'select id, name, age from...'
if n == 'from' {
for i, field in fields {
q += field.name
if i < fields.len - 1 {
q += ', '
}
}
q += ' from '
}
for field in fields {
//println('registering sql field var $field.name')
if field.typ != 'string' && field.typ != 'int' {
continue
}
p.cur_fn.register_var({ field | is_used:true })
}
q += table_name
// `where` statement
if p.tok == .name && p.lit == 'where' {
p.next()
p.cgen.start_tmp()
p.is_sql = true
p.bool_expression()
p.is_sql = false
q += ' where ' + p.cgen.end_tmp()
}
// limit?
mut query_one := false
if p.tok == .name && p.lit == 'limit' {
p.next()
p.cgen.start_tmp()
p.is_sql = true
p.bool_expression()
p.is_sql = false
limit := p.cgen.end_tmp()
q += ' limit ' + limit
// `limit 1` means we are getting `?User`, not `[]User`
if limit.trim_space() == '1' {
query_one = true
}
}
println('sql query="$q"')
p.cgen.insert_before('// DEBUG_SQL prefix: $qprefix | fn_ph: $fn_ph | query: "$q" ')
if n == 'count' {
p.cgen.set_placeholder(fn_ph, 'pg__DB_q_int(')
p.gen(', tos2("$q"))')
} else {
// Build an object, assign each field.
tmp := p.get_tmp()
mut obj_gen := strings.new_builder(300)
for i, field in fields {
mut cast := ''
if field.typ == 'int' {
cast = 'v_string_int'
}
obj_gen.writeln('${qprefix}$tmp . $field.name = $cast( *(string*)array__get(${qprefix}row.vals, $i) );')
}
// One object
if query_one {
mut params_gen := sql_params2params_gen( p.sql_params, p.sql_types, qprefix )
p.cgen.insert_before('
char* ${qprefix}params[$p.sql_i];
$params_gen
Option_${table_name} opt_${qprefix}$tmp;
void* ${qprefix}res = PQexecParams(db.conn, "$q", $p.sql_i, 0, ${qprefix}params, 0, 0, 0) ;
array_pg__Row ${qprefix}rows = pg__res_to_rows ( ${qprefix}res ) ;
Option_pg__Row opt_${qprefix}row = pg__rows_first_or_empty( ${qprefix}rows );
if (! opt_${qprefix}row . ok ) {
opt_${qprefix}$tmp = v_error( opt_${qprefix}row . error );
}else{
$table_name ${qprefix}$tmp;
pg__Row ${qprefix}row = *(pg__Row*) opt_${qprefix}row . data;
${obj_gen.str()}
opt_${qprefix}$tmp = opt_ok( & ${qprefix}$tmp, sizeof($table_name) );
}
')
p.cgen.resetln('opt_${qprefix}$tmp')
}
// Array
else {
q += ' order by id'
params_gen := sql_params2params_gen( p.sql_params, p.sql_types, qprefix )
p.cgen.insert_before('char* ${qprefix}params[$p.sql_i];
$params_gen
void* ${qprefix}res = PQexecParams(db.conn, "$q", $p.sql_i, 0, ${qprefix}params, 0, 0, 0) ;
array_pg__Row ${qprefix}rows = pg__res_to_rows(${qprefix}res);
// TODO preallocate
array ${qprefix}arr_$tmp = new_array(0, 0, sizeof($table_name));
for (int i = 0; i < ${qprefix}rows.len; i++) {
pg__Row ${qprefix}row = *(pg__Row*)array__get(${qprefix}rows, i);
$table_name ${qprefix}$tmp;
${obj_gen.str()}
_PUSH(&${qprefix}arr_$tmp, ${qprefix}$tmp, ${tmp}2, $table_name);
}
')
p.cgen.resetln('${qprefix}arr_$tmp')
}
}
if n == 'count' {
return 'int'
} else if query_one {
opt_type := 'Option_$table_name'
p.cgen.typedefs << 'typedef Option $opt_type;'
p.table.register_type( opt_type )
return opt_type
} else {
p.register_array('array_$table_name')
return 'array_$table_name'
}
}
// `db.insert(user)`
fn (p mut Parser) insert_query(fn_ph int) {
p.check_name()
p.check(.lpar)
var_name := p.check_name()
p.check(.rpar)
var := p.cur_fn.find_var(var_name)
typ := p.table.find_type(var.typ)
mut fields := []Var
for i, field in typ.fields {
if field.typ != 'string' && field.typ != 'int' {
continue
}
fields << field
}
if fields.len == 0 {
p.error('V orm: insert: empty fields in `$var.typ`')
}
if fields[0].name != 'id' {
p.error('V orm: `id int` must be the first field in `$var.typ`')
}
table_name := var.typ
mut sfields := '' // 'name, city, country'
mut params := '' // params[0] = 'bob'; params[1] = 'Vienna';
mut vals := '' // $1, $2, $3...
mut nr_vals := 0
for i, field in fields {
if field.name == 'id' {
continue
}
sfields += field.name
vals += '$' + i.str()
nr_vals++
params += 'params[${i-1}] = '
if field.typ == 'string' {
params += '$var_name . $field.name .str;\n'
} else if field.typ == 'int' {
params += 'int_str($var_name . $field.name).str;\n'
} else {
p.error('V ORM: unsupported type `$field.typ`')
}
if i < fields.len - 1 {
sfields += ', '
vals += ', '
}
}
p.cgen.insert_before('char* params[$nr_vals];' + params)
p.cgen.set_placeholder(fn_ph, 'PQexecParams( ')
p.genln('.conn, "insert into $table_name ($sfields) values ($vals)", $nr_vals,
0, params, 0, 0, 0)')
}