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278 lines
6.6 KiB
278 lines
6.6 KiB
// Modified from: database/sql/convert.go
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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package rel
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import (
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"database/sql"
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"database/sql/driver"
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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 _, localTimeOffset = time.Now().Local().Zone()
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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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// dest will be set to zero value if src is nil.
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// this function assumes dest will never be nil.
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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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*d = s
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return nil
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case *[]byte:
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*d = []byte(s)
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return nil
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case *sql.RawBytes:
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*d = append((*d)[:0], 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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*d = string(s)
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return nil
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case *interface{}:
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*d = cloneBytes(s)
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return nil
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case *[]byte:
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*d = cloneBytes(s)
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return nil
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case *sql.RawBytes:
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*d = 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 *time.Time:
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// make sure timezone equal for test assertion.
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if _, offset := s.Zone(); offset == localTimeOffset {
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*d = s.Local()
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} else {
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*d = s
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}
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return nil
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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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*d = []byte(s.Format(time.RFC3339Nano))
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return nil
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case *sql.RawBytes:
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*d = s.AppendFormat((*d)[:0], time.RFC3339Nano)
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return nil
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}
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case nil:
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assignZero(dest)
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return nil
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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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if s, ok := asString(src); ok {
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*d = s
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return nil
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}
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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 *sql.RawBytes:
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sv = reflect.ValueOf(src)
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if b, ok := asBytes([]byte(*d)[:0], sv); ok {
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*d = sql.RawBytes(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 !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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// The following conversions use a string value as an intermediate representation
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// to convert between various numeric types.
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//
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// This also allows scanning into user defined types such as "type Int int64".
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// For symmetry, also check for string destination types.
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if s, ok := asString(src); ok {
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switch dv.Kind() {
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case reflect.Ptr:
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dv.Set(reflect.New(dv.Type().Elem()))
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return convertAssign(dv.Interface(), src)
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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i64, err := strconv.ParseInt(s, 10, dv.Type().Bits())
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if err != nil {
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// The errors that ParseInt returns have concrete type *NumError
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err = err.(*strconv.NumError).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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u64, err := strconv.ParseUint(s, 10, dv.Type().Bits())
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if err != nil {
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// The errors that ParseUint returns have concrete type *NumError
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err = err.(*strconv.NumError).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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f64, err := strconv.ParseFloat(s, dv.Type().Bits())
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if err != nil {
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// The errors that ParseFloat returns have concrete type *NumError
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err = err.(*strconv.NumError).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(s)
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return nil
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}
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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 cloneBytes(b []byte) []byte {
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if b == nil {
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return nil
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}
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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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func asString(src interface{}) (string, bool) {
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switch v := src.(type) {
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case string:
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return v, true
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case []byte:
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return string(v), true
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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), true
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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), true
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case reflect.Float64:
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return strconv.FormatFloat(rv.Float(), 'g', -1, 64), true
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case reflect.Float32:
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return strconv.FormatFloat(rv.Float(), 'g', -1, 32), true
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case reflect.Bool:
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return strconv.FormatBool(rv.Bool()), true
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}
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return "", false
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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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func assignZero(dest interface{}) {
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switch d := dest.(type) {
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case *bool:
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*d = false
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case *string:
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*d = ""
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case *int:
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*d = 0
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case *int8:
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*d = 0
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case *int16:
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*d = 0
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case *int32:
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*d = 0
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case *int64:
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*d = 0
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case *uint:
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*d = 0
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case *uint8:
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*d = 0
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case *uint16:
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*d = 0
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case *uint32:
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*d = 0
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case *uint64:
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*d = 0
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case *uintptr:
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*d = 0
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case *float32:
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*d = 0
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case *float64:
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*d = 0
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case *interface{}:
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*d = nil
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case *[]byte:
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*d = nil
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case *sql.RawBytes:
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*d = nil
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default:
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rv := reflect.ValueOf(dest)
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rv.Elem().Set(reflect.Zero(rv.Type().Elem()))
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}
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}
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