336 lines
7.5 KiB
Go
336 lines
7.5 KiB
Go
// Copyright 2017 The Xorm Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package xorm
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import (
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"database/sql/driver"
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"errors"
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"fmt"
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"reflect"
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"strconv"
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"time"
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)
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var errNilPtr = errors.New("destination pointer is nil") // embedded in descriptive error
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func strconvErr(err error) error {
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if ne, ok := err.(*strconv.NumError); ok {
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return ne.Err
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}
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return err
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}
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func cloneBytes(b []byte) []byte {
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if b == nil {
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return nil
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} else {
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c := make([]byte, len(b))
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copy(c, b)
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return c
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}
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}
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func asString(src interface{}) string {
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switch v := src.(type) {
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case string:
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return v
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case []byte:
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return string(v)
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}
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rv := reflect.ValueOf(src)
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switch rv.Kind() {
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return strconv.FormatInt(rv.Int(), 10)
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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return strconv.FormatUint(rv.Uint(), 10)
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case reflect.Float64:
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return strconv.FormatFloat(rv.Float(), 'g', -1, 64)
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case reflect.Float32:
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return strconv.FormatFloat(rv.Float(), 'g', -1, 32)
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case reflect.Bool:
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return strconv.FormatBool(rv.Bool())
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}
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return fmt.Sprintf("%v", src)
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}
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func asBytes(buf []byte, rv reflect.Value) (b []byte, ok bool) {
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switch rv.Kind() {
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return strconv.AppendInt(buf, rv.Int(), 10), true
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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return strconv.AppendUint(buf, rv.Uint(), 10), true
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case reflect.Float32:
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return strconv.AppendFloat(buf, rv.Float(), 'g', -1, 32), true
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case reflect.Float64:
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return strconv.AppendFloat(buf, rv.Float(), 'g', -1, 64), true
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case reflect.Bool:
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return strconv.AppendBool(buf, rv.Bool()), true
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case reflect.String:
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s := rv.String()
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return append(buf, s...), true
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}
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return
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}
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// convertAssign copies to dest the value in src, converting it if possible.
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// An error is returned if the copy would result in loss of information.
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// dest should be a pointer type.
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func convertAssign(dest, src interface{}) error {
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// Common cases, without reflect.
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switch s := src.(type) {
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case string:
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switch d := dest.(type) {
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case *string:
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if d == nil {
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return errNilPtr
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}
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*d = s
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return nil
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case *[]byte:
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if d == nil {
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return errNilPtr
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}
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*d = []byte(s)
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return nil
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}
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case []byte:
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switch d := dest.(type) {
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case *string:
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if d == nil {
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return errNilPtr
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}
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*d = string(s)
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return nil
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case *interface{}:
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if d == nil {
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return errNilPtr
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}
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*d = cloneBytes(s)
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return nil
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case *[]byte:
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if d == nil {
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return errNilPtr
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}
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*d = cloneBytes(s)
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return nil
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}
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case time.Time:
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switch d := dest.(type) {
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case *string:
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*d = s.Format(time.RFC3339Nano)
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return nil
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case *[]byte:
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if d == nil {
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return errNilPtr
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}
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*d = []byte(s.Format(time.RFC3339Nano))
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return nil
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}
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case nil:
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switch d := dest.(type) {
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case *interface{}:
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if d == nil {
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return errNilPtr
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}
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*d = nil
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return nil
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case *[]byte:
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if d == nil {
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return errNilPtr
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}
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*d = nil
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return nil
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}
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}
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var sv reflect.Value
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switch d := dest.(type) {
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case *string:
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sv = reflect.ValueOf(src)
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switch sv.Kind() {
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case reflect.Bool,
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reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
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reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
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reflect.Float32, reflect.Float64:
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*d = asString(src)
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return nil
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}
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case *[]byte:
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sv = reflect.ValueOf(src)
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if b, ok := asBytes(nil, sv); ok {
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*d = b
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return nil
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}
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case *bool:
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bv, err := driver.Bool.ConvertValue(src)
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if err == nil {
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*d = bv.(bool)
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}
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return err
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case *interface{}:
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*d = src
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return nil
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}
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dpv := reflect.ValueOf(dest)
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if dpv.Kind() != reflect.Ptr {
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return errors.New("destination not a pointer")
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}
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if dpv.IsNil() {
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return errNilPtr
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}
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if !sv.IsValid() {
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sv = reflect.ValueOf(src)
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}
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dv := reflect.Indirect(dpv)
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if sv.IsValid() && sv.Type().AssignableTo(dv.Type()) {
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switch b := src.(type) {
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case []byte:
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dv.Set(reflect.ValueOf(cloneBytes(b)))
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default:
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dv.Set(sv)
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}
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return nil
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}
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if dv.Kind() == sv.Kind() && sv.Type().ConvertibleTo(dv.Type()) {
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dv.Set(sv.Convert(dv.Type()))
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return nil
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}
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switch dv.Kind() {
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case reflect.Ptr:
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if src == nil {
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dv.Set(reflect.Zero(dv.Type()))
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return nil
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} else {
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dv.Set(reflect.New(dv.Type().Elem()))
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return convertAssign(dv.Interface(), src)
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}
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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s := asString(src)
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i64, err := strconv.ParseInt(s, 10, dv.Type().Bits())
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if err != nil {
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err = strconvErr(err)
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return fmt.Errorf("converting driver.Value type %T (%q) to a %s: %v", src, s, dv.Kind(), err)
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}
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dv.SetInt(i64)
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return nil
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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s := asString(src)
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u64, err := strconv.ParseUint(s, 10, dv.Type().Bits())
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if err != nil {
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err = strconvErr(err)
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return fmt.Errorf("converting driver.Value type %T (%q) to a %s: %v", src, s, dv.Kind(), err)
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}
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dv.SetUint(u64)
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return nil
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case reflect.Float32, reflect.Float64:
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s := asString(src)
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f64, err := strconv.ParseFloat(s, dv.Type().Bits())
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if err != nil {
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err = strconvErr(err)
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return fmt.Errorf("converting driver.Value type %T (%q) to a %s: %v", src, s, dv.Kind(), err)
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}
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dv.SetFloat(f64)
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return nil
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case reflect.String:
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dv.SetString(asString(src))
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return nil
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}
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return fmt.Errorf("unsupported Scan, storing driver.Value type %T into type %T", src, dest)
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}
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func asKind(vv reflect.Value, tp reflect.Type) (interface{}, error) {
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switch tp.Kind() {
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case reflect.Int64:
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return vv.Int(), nil
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case reflect.Int:
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return int(vv.Int()), nil
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case reflect.Int32:
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return int32(vv.Int()), nil
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case reflect.Int16:
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return int16(vv.Int()), nil
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case reflect.Int8:
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return int8(vv.Int()), nil
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case reflect.Uint64:
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return vv.Uint(), nil
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case reflect.Uint:
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return uint(vv.Uint()), nil
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case reflect.Uint32:
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return uint32(vv.Uint()), nil
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case reflect.Uint16:
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return uint16(vv.Uint()), nil
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case reflect.Uint8:
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return uint8(vv.Uint()), nil
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case reflect.String:
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return vv.String(), nil
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case reflect.Slice:
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if tp.Elem().Kind() == reflect.Uint8 {
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v, err := strconv.ParseInt(string(vv.Interface().([]byte)), 10, 64)
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if err != nil {
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return nil, err
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}
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return v, nil
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}
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}
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return nil, fmt.Errorf("unsupported primary key type: %v, %v", tp, vv)
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}
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func convertFloat(v interface{}) (float64, error) {
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switch v.(type) {
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case float32:
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return float64(v.(float32)), nil
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case float64:
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return v.(float64), nil
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case string:
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i, err := strconv.ParseFloat(v.(string), 64)
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if err != nil {
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return 0, err
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}
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return i, nil
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case []byte:
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i, err := strconv.ParseFloat(string(v.([]byte)), 64)
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if err != nil {
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return 0, err
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}
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return i, nil
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}
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return 0, fmt.Errorf("unsupported type: %v", v)
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}
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func convertInt(v interface{}) (int64, error) {
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switch v.(type) {
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case int:
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return int64(v.(int)), nil
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case int8:
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return int64(v.(int8)), nil
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case int16:
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return int64(v.(int16)), nil
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case int32:
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return int64(v.(int32)), nil
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case int64:
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return v.(int64), nil
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case []byte:
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i, err := strconv.ParseInt(string(v.([]byte)), 10, 64)
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if err != nil {
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return 0, err
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}
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return i, nil
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case string:
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i, err := strconv.ParseInt(v.(string), 10, 64)
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if err != nil {
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return 0, err
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}
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return i, nil
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}
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return 0, fmt.Errorf("unsupported type: %v", v)
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}
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