60 lines
1.1 KiB
Go
60 lines
1.1 KiB
Go
package db0403
|
|
|
|
import (
|
|
"errors"
|
|
"slices"
|
|
)
|
|
|
|
type Schema struct {
|
|
Table string
|
|
Cols []Column
|
|
PKey []int // indexes of primary key columns
|
|
}
|
|
|
|
type Column struct {
|
|
Name string
|
|
Type CellType
|
|
}
|
|
|
|
type Row []Cell
|
|
|
|
func (schema *Schema) NewRow() Row {
|
|
return make(Row, len(schema.Cols))
|
|
}
|
|
|
|
func (row Row) EncodeKey(schema *Schema) (key []byte)
|
|
|
|
func (row Row) EncodeVal(schema *Schema) (val []byte) {
|
|
check(len(row) == len(schema.Cols))
|
|
for idx, value := range row {
|
|
if !slices.Contains(schema.PKey, idx) {
|
|
check(value.Type == schema.Cols[idx].Type)
|
|
val = row[idx].EncodeVal(val)
|
|
}
|
|
}
|
|
return val
|
|
}
|
|
|
|
func (row Row) DecodeKey(schema *Schema, key []byte) (err error)
|
|
|
|
func (row Row) DecodeVal(schema *Schema, val []byte) (err error) {
|
|
check(len(row) == len(schema.Cols))
|
|
|
|
for idx, col := range schema.Cols {
|
|
if slices.Contains(schema.PKey, idx) {
|
|
continue
|
|
}
|
|
row[idx] = Cell{Type: col.Type}
|
|
if val, err = row[idx].DecodeVal(val); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if len(val) != 0 {
|
|
return errors.New("trailing garbage")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// QzBQWVJJOUhU https://trialofcode.org/
|