goext/sq/converter.go

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2023-05-28 22:55:06 +02:00
package sq
import (
"errors"
"fmt"
"gogs.mikescher.com/BlackForestBytes/goext/langext"
"time"
)
//TODO UNFINISHED
// this is not finished
// idea was that we can register converter in the database struct
// they get inherited from the transactions
// and when marshallingunmarshaling (sq.Query | sq.QueryAll)
// or marshaling (sq.InsertSingle)
// the types get converter automatically...
type DBTypeConverter interface {
ModelTypeString() string
DBTypeString() string
ModelToDB(v any) (any, error)
DBToModel(v any) (any, error)
}
var ConverterBoolToBit = NewDBTypeConverter[bool, int](func(v bool) (int, error) {
return langext.Conditional(v, 1, 0), nil
}, func(v int) (bool, error) {
if v == 0 {
return false, nil
}
if v == 1 {
return true, nil
}
return false, errors.New(fmt.Sprintf("invalid valud for boolean: '%d'", v))
})
var ConverterTimeToUnixMillis = NewDBTypeConverter[time.Time, int64](func(v time.Time) (int64, error) {
return v.UnixMilli(), nil
}, func(v int64) (time.Time, error) {
return time.UnixMilli(v), nil
})
var ConverterOptTimeToUnixMillis = NewDBTypeConverter[*time.Time, *int64](func(v *time.Time) (*int64, error) {
if v == nil {
return nil, nil
}
return langext.Ptr(v.UnixMilli()), nil
}, func(v *int64) (*time.Time, error) {
if v == nil {
return nil, nil
}
return langext.Ptr(time.UnixMilli(*v)), nil
})
type dbTypeConverterImpl[TModelData any, TDBData any] struct {
dbTypeString string
modelTypeString string
todb func(v TModelData) (TDBData, error)
tomodel func(v TDBData) (TModelData, error)
}
func (t *dbTypeConverterImpl[TModelData, TDBData]) ModelTypeString() string {
return t.modelTypeString
}
func (t *dbTypeConverterImpl[TModelData, TDBData]) DBTypeString() string {
return t.dbTypeString
}
func (t *dbTypeConverterImpl[TModelData, TDBData]) ModelToDB(v any) (any, error) {
if vv, ok := v.(TModelData); ok {
return t.todb(vv)
}
return nil, errors.New(fmt.Sprintf("Unexpected value in DBTypeConverter, expected '%s', found '%T'", t.modelTypeString, v))
}
func (t *dbTypeConverterImpl[TModelData, TDBData]) DBToModel(v any) (any, error) {
if vv, ok := v.(TDBData); ok {
return t.tomodel(vv)
}
return nil, errors.New(fmt.Sprintf("Unexpected value in DBTypeConverter, expected '%s', found '%T'", t.dbTypeString, v))
}
func NewDBTypeConverter[TModelData any, TDBData any](todb func(v TModelData) (TDBData, error), tomodel func(v TDBData) (TModelData, error)) DBTypeConverter {
return &dbTypeConverterImpl[TModelData, TDBData]{
dbTypeString: fmt.Sprintf("%T", *new(TDBData)),
modelTypeString: fmt.Sprintf("%T", *new(TModelData)),
todb: todb,
tomodel: tomodel,
}
}