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