388 lines
7.4 KiB
Go
Vendored
388 lines
7.4 KiB
Go
Vendored
// 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 convert
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import (
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"database/sql"
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"database/sql/driver"
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"encoding/json"
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"errors"
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"fmt"
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"math/big"
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"reflect"
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"strconv"
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"time"
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)
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// Conversion is an interface. A type implements Conversion will according
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// the custom method to fill into database and retrieve from database.
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type Conversion interface {
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FromDB([]byte) error
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ToDB() ([]byte, error)
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}
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// ErrNilPtr represents an error
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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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}
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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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// Assign 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 Assign(dest, src interface{}, originalLocation *time.Location, convertedLocation *time.Location) error {
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// Common cases, without reflect.
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switch s := src.(type) {
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case *interface{}:
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return Assign(dest, *s, originalLocation, convertedLocation)
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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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case *sql.NullString:
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switch d := dest.(type) {
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case *int:
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if s.Valid {
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*d, _ = strconv.Atoi(s.String)
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}
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return nil
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case *int64:
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if s.Valid {
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*d, _ = strconv.ParseInt(s.String, 10, 64)
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}
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return nil
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case *string:
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if s.Valid {
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*d = s.String
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}
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return nil
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case *time.Time:
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if s.Valid {
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var err error
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dt, err := String2Time(s.String, originalLocation, convertedLocation)
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if err != nil {
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return err
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}
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*d = *dt
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}
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return nil
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case *sql.NullTime:
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if s.Valid {
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var err error
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dt, err := String2Time(s.String, originalLocation, convertedLocation)
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if err != nil {
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return err
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}
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d.Valid = true
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d.Time = *dt
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}
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return nil
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case *big.Float:
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if s.Valid {
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if d == nil {
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d = big.NewFloat(0)
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}
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d.SetString(s.String)
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}
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return nil
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}
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case *sql.NullInt32:
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switch d := dest.(type) {
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case *int:
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if s.Valid {
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*d = int(s.Int32)
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}
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return nil
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case *int8:
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if s.Valid {
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*d = int8(s.Int32)
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}
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return nil
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case *int16:
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if s.Valid {
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*d = int16(s.Int32)
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}
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return nil
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case *int32:
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if s.Valid {
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*d = s.Int32
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}
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return nil
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case *int64:
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if s.Valid {
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*d = int64(s.Int32)
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}
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return nil
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}
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case *sql.NullInt64:
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switch d := dest.(type) {
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case *int:
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if s.Valid {
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*d = int(s.Int64)
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}
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return nil
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case *int8:
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if s.Valid {
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*d = int8(s.Int64)
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}
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return nil
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case *int16:
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if s.Valid {
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*d = int16(s.Int64)
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}
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return nil
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case *int32:
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if s.Valid {
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*d = int32(s.Int64)
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}
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return nil
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case *int64:
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if s.Valid {
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*d = s.Int64
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}
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return nil
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}
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case *sql.NullFloat64:
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switch d := dest.(type) {
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case *int:
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if s.Valid {
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*d = int(s.Float64)
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}
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return nil
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case *float64:
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if s.Valid {
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*d = s.Float64
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}
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return nil
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}
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case *sql.NullBool:
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switch d := dest.(type) {
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case *bool:
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if s.Valid {
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*d = s.Bool
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}
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return nil
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}
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case *sql.NullTime:
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switch d := dest.(type) {
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case *time.Time:
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if s.Valid {
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*d = s.Time
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}
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return nil
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case *string:
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if s.Valid {
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*d = s.Time.In(convertedLocation).Format("2006-01-02 15:04:05")
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}
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return nil
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}
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case *NullUint32:
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switch d := dest.(type) {
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case *uint8:
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if s.Valid {
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*d = uint8(s.Uint32)
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}
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return nil
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case *uint16:
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if s.Valid {
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*d = uint16(s.Uint32)
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}
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return nil
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case *uint:
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if s.Valid {
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*d = uint(s.Uint32)
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}
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return nil
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}
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case *NullUint64:
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switch d := dest.(type) {
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case *uint64:
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if s.Valid {
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*d = s.Uint64
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}
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return nil
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}
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case *sql.RawBytes:
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switch d := dest.(type) {
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case Conversion:
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return d.FromDB(*s)
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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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if b, ok := AsBytes(src); 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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return AssignValue(reflect.ValueOf(dest), src)
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}
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var (
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scannerTypePlaceHolder sql.Scanner
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scannerType = reflect.TypeOf(&scannerTypePlaceHolder).Elem()
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)
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// AssignValue assign src as dv
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func AssignValue(dv reflect.Value, src interface{}) error {
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if src == nil {
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return nil
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}
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if dv.Type().Implements(scannerType) {
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return dv.Interface().(sql.Scanner).Scan(src)
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}
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switch dv.Kind() {
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case reflect.Ptr:
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if dv.IsNil() {
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dv.Set(reflect.New(dv.Type().Elem()))
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}
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return AssignValue(dv.Elem(), src)
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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i64, err := AsInt64(src)
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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 to a %s: %v", src, 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 := AsUint64(src)
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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 to a %s: %v", src, 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 := AsFloat64(src)
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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 to a %s: %v", src, 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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case reflect.Bool:
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b, err := AsBool(src)
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if err != nil {
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return err
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}
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dv.SetBool(b)
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return nil
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case reflect.Slice, reflect.Map, reflect.Struct, reflect.Array:
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data, ok := AsBytes(src)
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if !ok {
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return fmt.Errorf("convert.AssignValue: src cannot be as bytes %#v", src)
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}
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if data == nil {
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return nil
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}
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if dv.Kind() != reflect.Ptr {
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dv = dv.Addr()
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}
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return json.Unmarshal(data, dv.Interface())
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default:
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return fmt.Errorf("convert.AssignValue: unsupported Scan, storing driver.Value type %T into type %T", src, dv.Interface())
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}
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}
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