module orm import time pub const ( num64 = [8, 12] nums = [5, 6, 7, 9, 10, 11, 16] float = [13, 14] string = 18 time = -2 type_idx = { 'i8': 5 'i16': 6 'int': 7 'i64': 8 'byte': 9 'u16': 10 'u32': 11 'u64': 12 'f32': 13 'f64': 14 'bool': 16 'string': 18 } string_max_len = 2048 ) pub type Primitive = InfixType | bool | byte | f32 | f64 | i16 | i64 | i8 | int | string | time.Time | u16 | u32 | u64 pub enum OperationKind { neq // != eq // == gt // > lt // < ge // >= le // <= } pub enum MathOperationKind { add // + sub // - mul // * div // / } pub enum StmtKind { insert update delete } pub enum OrderType { asc desc } fn (kind OperationKind) to_str() string { str := match kind { .neq { '!=' } .eq { '=' } .gt { '>' } .lt { '<' } .ge { '>=' } .le { '<=' } } return str } fn (kind OrderType) to_str() string { return match kind { .desc { 'DESC' } .asc { 'ASC' } } } pub struct QueryData { pub: fields []string data []Primitive types []int kinds []OperationKind is_and []bool } pub struct InfixType { pub: name string operator MathOperationKind right Primitive } pub struct TableField { pub: name string typ int is_time bool default_val string is_arr bool attrs []StructAttribute } pub struct SelectConfig { pub: table string is_count bool has_where bool has_order bool order string order_type OrderType has_limit bool primary string = 'id' // should be set if primary is different than 'id' and 'has_limit' is false has_offset bool fields []string types []int } pub interface Connection { @select(config SelectConfig, data QueryData, where QueryData) ?[][]Primitive insert(table string, data QueryData) ? update(table string, data QueryData, where QueryData) ? delete(table string, where QueryData) ? create(table string, fields []TableField) ? drop(talbe string) ? last_id() Primitive } pub fn orm_stmt_gen(table string, para string, kind StmtKind, num bool, qm string, start_pos int, data QueryData, where QueryData) string { mut str := '' mut c := start_pos match kind { .insert { mut values := []string{} for _ in 0 .. data.fields.len { // loop over the length of data.field and generate ?0, ?1 or just ? based on the $num parameter for value placeholders if num { values << '$qm$c' c++ } else { values << '$qm' } } str += 'INSERT INTO $para$table$para (' str += data.fields.map('$para$it$para').join(', ') str += ') VALUES (' str += values.join(', ') str += ')' } .update { str += 'UPDATE $para$table$para SET ' for i, field in data.fields { str += '$para$field$para = ' if data.data.len > i { d := data.data[i] if d is InfixType { op := match d.operator { .add { '+' } .sub { '-' } .mul { '*' } .div { '/' } } str += '$d.name $op $qm' } else { str += '$qm' } } else { str += '$qm' } if num { str += '$c' c++ } if i < data.fields.len - 1 { str += ', ' } } str += ' WHERE ' } .delete { str += 'DELETE FROM $para$table$para WHERE ' } } if kind == .update || kind == .delete { for i, field in where.fields { str += '$para$field$para ${where.kinds[i].to_str()} $qm' if num { str += '$c' c++ } if i < where.fields.len - 1 { str += ' AND ' } } } str += ';' return str } pub fn orm_select_gen(orm SelectConfig, para string, num bool, qm string, start_pos int, where QueryData) string { mut str := 'SELECT ' if orm.is_count { str += 'COUNT(*)' } else { for i, field in orm.fields { str += '$para$field$para' if i < orm.fields.len - 1 { str += ', ' } } } str += ' FROM $para$orm.table$para' mut c := start_pos if orm.has_where { str += ' WHERE ' for i, field in where.fields { str += '$para$field$para ${where.kinds[i].to_str()} $qm' if num { str += '$c' c++ } if i < where.fields.len - 1 { if where.is_and[i] { str += ' AND ' } else { str += ' OR ' } } } } str += ' ORDER BY ' if orm.has_order { str += '$para$orm.order$para ' str += orm.order_type.to_str() } else { str += '$para$orm.primary$para ' str += orm.order_type.to_str() } if orm.has_limit { str += ' LIMIT ?' if num { str += '$c' c++ } } if orm.has_offset { str += ' OFFSET ?' if num { str += '$c' c++ } } str += ';' return str } pub fn orm_table_gen(table string, para string, defaults bool, def_unique_len int, fields []TableField, sql_from_v fn (int) ?string, alternative bool) ?string { mut str := 'CREATE TABLE IF NOT EXISTS $para$table$para (' if alternative { str = 'IF NOT EXISTS (SELECT * FROM sysobjects WHERE name=$para$table$para and xtype=${para}U$para) CREATE TABLE $para$table$para (' } mut fs := []string{} mut unique_fields := []string{} mut unique := map[string][]string{} mut primary := '' for field in fields { if field.is_arr { continue } mut no_null := false mut is_unique := false mut is_skip := false mut unique_len := 0 // mut fkey := '' mut field_name := sql_field_name(field) for attr in field.attrs { match attr.name { 'primary' { primary = field.name } 'unique' { if attr.arg != '' { if attr.kind == .string { unique[attr.arg] << field_name continue } else if attr.kind == .number { unique_len = attr.arg.int() is_unique = true continue } } is_unique = true } 'nonull' { no_null = true } 'skip' { is_skip = true } /*'fkey' { if attr.arg != '' { if attr.kind == .string { fkey = attr.arg continue } } }*/ else {} } } if is_skip { continue } mut stmt := '' mut ctyp := sql_from_v(sql_field_type(field)) or { field_name = '${field_name}_id' sql_from_v(7) ? } if ctyp == '' { return error('Unknown type ($field.typ) for field $field.name in struct $table') } stmt = '$para$field_name$para $ctyp' if defaults && field.default_val != '' { stmt += ' DEFAULT $field.default_val' } if no_null { stmt += ' NOT NULL' } if is_unique { mut f := 'UNIQUE($para$field_name$para' if ctyp == 'TEXT' && def_unique_len > 0 { if unique_len > 0 { f += '($unique_len)' } else { f += '($def_unique_len)' } } f += ')' unique_fields << f } fs << stmt } if primary == '' { return error('A primary key is required for $table') } if unique.len > 0 { for k, v in unique { mut tmp := []string{} for f in v { tmp << '$para$f$para' } fs << '/* $k */UNIQUE(${tmp.join(', ')})' } } fs << 'PRIMARY KEY($para$primary$para)' fs << unique_fields str += fs.join(', ') str += ');' return str } fn sql_field_type(field TableField) int { mut typ := field.typ if field.is_time { return -2 } for attr in field.attrs { if attr.kind == .plain && attr.name == 'sql' && attr.arg != '' { if attr.arg.to_lower() == 'serial' { typ = -1 break } typ = orm.type_idx[attr.arg] break } } return typ } fn sql_field_name(field TableField) string { mut name := field.name for attr in field.attrs { if attr.name == 'sql' && attr.has_arg && attr.kind == .string { name = attr.arg break } } return name } // needed for backend functions pub fn bool_to_primitive(b bool) Primitive { return Primitive(b) } pub fn f32_to_primitive(b f32) Primitive { return Primitive(b) } pub fn f64_to_primitive(b f64) Primitive { return Primitive(b) } pub fn i8_to_primitive(b i8) Primitive { return Primitive(b) } pub fn i16_to_primitive(b i16) Primitive { return Primitive(b) } pub fn int_to_primitive(b int) Primitive { return Primitive(b) } pub fn i64_to_primitive(b i64) Primitive { return Primitive(b) } pub fn byte_to_primitive(b byte) Primitive { return Primitive(b) } pub fn u16_to_primitive(b u16) Primitive { return Primitive(b) } pub fn u32_to_primitive(b u32) Primitive { return Primitive(b) } pub fn u64_to_primitive(b u64) Primitive { return Primitive(b) } pub fn string_to_primitive(b string) Primitive { return Primitive(b) } pub fn time_to_primitive(b time.Time) Primitive { return Primitive(b) } pub fn infix_to_primitive(b InfixType) Primitive { return Primitive(b) }