/
reflect_scheme.go
81 lines (69 loc) · 1.7 KB
/
reflect_scheme.go
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package sqlite
import (
"errors"
"reflect"
)
//
type Builder struct {
//⽤于存储属性字段
fileId []reflect.StructField
}
func NewSchemeBuilder() *Builder {
return &Builder{}
}
//添加字段
func (b *Builder) AddField(field string, typ reflect.Type) *Builder {
b.fileId = append(b.fileId, reflect.StructField{Name: field, Type: typ})
return b
}
//根据预先添加的字段构建出结构体
func (b *Builder) Build() *Struct {
stu := reflect.StructOf(b.fileId)
index := make(map[string]int)
for i := 0; i < stu.NumField(); i++ {
index[stu.Field(i).Name] = i
}
return &Struct{stu, index}
}
func (b *Builder) AddString(name string) *Builder {
return b.AddField(name, reflect.TypeOf(""))
}
func (b *Builder) AddBool(name string) *Builder {
return b.AddField(name, reflect.TypeOf(true))
}
func (b *Builder) AddInt64(name string) *Builder {
return b.AddField(name, reflect.TypeOf(int64(0)))
}
func (b *Builder) AddFloat64(name string) *Builder {
return b.AddField(name, reflect.TypeOf(float64(1.2)))
}
//实际⽣成的结构体,基类
//结构体的类型
type Struct struct {
typ reflect.Type
index map[string]int
}
func (s Struct) New() *Instance {
return &Instance{reflect.New(s.typ).Elem(), s.index}
}
//结构体的值
type Instance struct {
instance reflect.Value
index map[string]int
}
var (
FieldNoExist error = errors.New("field no exist")
)
func (in Instance) Field(name string) (reflect.Value, error) {
if i, ok := in.index[name]; ok {
return in.instance.Field(i), nil
} else {
return reflect.Value{}, FieldNoExist
}
}
func (i *Instance) Interface() interface{} {
return i.instance.Interface()
}
func (i *Instance) Addr() interface{} {
return i.instance.Addr().Interface()
}