377 lines
11 KiB
Go
377 lines
11 KiB
Go
// 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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// license that can be found in the LICENSE file.
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// Type conversions for Scan.
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package intimate
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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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)
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var errNilPtr = errors.New("destination pointer is nil") // embedded in descriptive error
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// convertAssignRows 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. If rows is passed in, the rows will
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// be used as the parent for any cursor values converted from a
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// driver.Rows to a *Rows.
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// func convertAssignRows(dest, src interface{}, rows *sql.Rows) 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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// case *sql.RawBytes:
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// if d == nil {
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// return errNilPtr
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// }
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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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// 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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// case *sql.RawBytes:
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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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// }
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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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// *d = s
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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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// 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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// case *sql.RawBytes:
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// if d == nil {
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// return errNilPtr
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// }
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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 decimalDecompose:
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// switch d := dest.(type) {
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// case decimalCompose:
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// return d.Compose(s.Decompose(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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// case *sql.RawBytes:
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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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// // The driver is returning a cursor the client may iterate over.
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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 *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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// if scanner, ok := dest.(sql.Scanner); ok {
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// return scanner.Scan(src)
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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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// // 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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// 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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// }
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// dv.Set(reflect.New(dv.Type().Elem()))
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// return convertAssignRows(dv.Interface(), src, rows)
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// case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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// if src == nil {
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// return fmt.Errorf("converting NULL to %s is unsupported", dv.Kind())
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// }
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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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// if src == nil {
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// return fmt.Errorf("converting NULL to %s is unsupported", dv.Kind())
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// }
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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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// if src == nil {
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// return fmt.Errorf("converting NULL to %s is unsupported", dv.Kind())
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// }
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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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// if src == nil {
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// return fmt.Errorf("converting NULL to %s is unsupported", dv.Kind())
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// }
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// switch v := src.(type) {
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// case string:
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// dv.SetString(v)
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// return nil
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// case []byte:
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// dv.SetString(string(v))
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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 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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}
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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 {
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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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var valuerReflectType = reflect.TypeOf((*driver.Valuer)(nil)).Elem()
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// callValuerValue returns vr.Value(), with one exception:
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// If vr.Value is an auto-generated method on a pointer type and the
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// pointer is nil, it would panic at runtime in the panicwrap
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// method. Treat it like nil instead.
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// Issue 8415.
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//
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// This is so people can implement driver.Value on value types and
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// still use nil pointers to those types to mean nil/NULL, just like
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// string/*string.
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//
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// This function is mirrored in the database/sql/driver package.
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func callValuerValue(vr driver.Valuer) (v driver.Value, err error) {
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if rv := reflect.ValueOf(vr); rv.Kind() == reflect.Ptr &&
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rv.IsNil() &&
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rv.Type().Elem().Implements(valuerReflectType) {
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return nil, nil
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}
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return vr.Value()
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}
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// decimal composes or decomposes a decimal value to and from individual parts.
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// There are four parts: a boolean negative flag, a form byte with three possible states
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// (finite=0, infinite=1, NaN=2), a base-2 big-endian integer
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// coefficient (also known as a significand) as a []byte, and an int32 exponent.
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// These are composed into a final value as "decimal = (neg) (form=finite) coefficient * 10 ^ exponent".
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// A zero length coefficient is a zero value.
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// The big-endian integer coefficient stores the most significant byte first (at coefficient[0]).
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// If the form is not finite the coefficient and exponent should be ignored.
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// The negative parameter may be set to true for any form, although implementations are not required
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// to respect the negative parameter in the non-finite form.
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//
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// Implementations may choose to set the negative parameter to true on a zero or NaN value,
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// but implementations that do not differentiate between negative and positive
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// zero or NaN values should ignore the negative parameter without error.
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// If an implementation does not support Infinity it may be converted into a NaN without error.
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// If a value is set that is larger than what is supported by an implementation,
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// an error must be returned.
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// Implementations must return an error if a NaN or Infinity is attempted to be set while neither
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// are supported.
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//
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// NOTE(kardianos): This is an experimental interface. See https://golang.org/issue/30870
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type decimal interface {
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decimalDecompose
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decimalCompose
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}
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type decimalDecompose interface {
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// Decompose returns the internal decimal state in parts.
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// If the provided buf has sufficient capacity, buf may be returned as the coefficient with
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// the value set and length set as appropriate.
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Decompose(buf []byte) (form byte, negative bool, coefficient []byte, exponent int32)
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}
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type decimalCompose interface {
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// Compose sets the internal decimal value from parts. If the value cannot be
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// represented then an error should be returned.
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Compose(form byte, negative bool, coefficient []byte, exponent int32) error
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}
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