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// Copyright 2012, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package sqltypes implements interfaces and types that represent SQL values.
package sqltypes
import (
"bytes"
"encoding/base64"
"encoding/gob"
"encoding/json"
"fmt"
"strconv"
"time"
"github.com/julsemaan/sqlparser/dependency/bson"
"github.com/julsemaan/sqlparser/dependency/bytes2"
"github.com/julsemaan/sqlparser/dependency/hack"
)
var (
NULL = Value{}
DONTESCAPE = byte(255)
nullstr = []byte("null")
)
// BinWriter interface is used for encoding values.
// Types like bytes.Buffer conform to this interface.
// We expect the writer objects to be in-memory buffers.
// So, we don't expect the write operations to fail.
type BinWriter interface {
Write([]byte) (int, error)
WriteByte(byte) error
}
// Value can store any SQL value. NULL is stored as nil.
type Value struct {
Inner InnerValue
}
// Numeric represents non-fractional SQL number.
type Numeric []byte
// Fractional represents fractional types like float and decimal
// It's functionally equivalent to Numeric other than how it's constructed
type Fractional []byte
// String represents any SQL type that needs to be represented using quotes.
type String []byte
// MakeNumeric makes a Numeric from a []byte without validation.
func MakeNumeric(b []byte) Value {
return Value{Numeric(b)}
}
// MakeFractional makes a Fractional value from a []byte without validation.
func MakeFractional(b []byte) Value {
return Value{Fractional(b)}
}
// MakeString makes a String value from a []byte.
func MakeString(b []byte) Value {
return Value{String(b)}
}
// Raw returns the raw bytes. All types are currently implemented as []byte.
func (v Value) Raw() []byte {
if v.Inner == nil {
return nil
}
return v.Inner.raw()
}
// String returns the raw value as a string
func (v Value) String() string {
if v.Inner == nil {
return ""
}
return hack.String(v.Inner.raw())
}
// ParseInt64 will parse a Numeric value into an int64
func (v Value) ParseInt64() (val int64, err error) {
if v.Inner == nil {
return 0, fmt.Errorf("value is null")
}
n, ok := v.Inner.(Numeric)
if !ok {
return 0, fmt.Errorf("value is not Numeric")
}
return strconv.ParseInt(string(n.raw()), 10, 64)
}
// ParseUint64 will parse a Numeric value into a uint64
func (v Value) ParseUint64() (val uint64, err error) {
if v.Inner == nil {
return 0, fmt.Errorf("value is null")
}
n, ok := v.Inner.(Numeric)
if !ok {
return 0, fmt.Errorf("value is not Numeric")
}
return strconv.ParseUint(string(n.raw()), 10, 64)
}
// EncodeSql encodes the value into an SQL statement. Can be binary.
func (v Value) EncodeSql(b BinWriter) {
if v.Inner == nil {
if _, err := b.Write(nullstr); err != nil {
panic(err)
}
} else {
v.Inner.encodeSql(b)
}
}
// EncodeAscii encodes the value using 7-bit clean ascii bytes.
func (v Value) EncodeAscii(b BinWriter) {
if v.Inner == nil {
if _, err := b.Write(nullstr); err != nil {
panic(err)
}
} else {
v.Inner.encodeAscii(b)
}
}
func (v Value) MarshalBson(buf *bytes2.ChunkedWriter, key string) {
if key == "" {
lenWriter := bson.NewLenWriter(buf)
defer lenWriter.Close()
key = bson.MAGICTAG
}
if v.IsNull() {
bson.EncodePrefix(buf, bson.Null, key)
} else {
bson.EncodeBinary(buf, key, v.Raw())
}
}
func (v *Value) UnmarshalBson(buf *bytes.Buffer, kind byte) {
if kind == bson.EOO {
bson.Next(buf, 4)
kind = bson.NextByte(buf)
bson.ReadCString(buf)
}
if kind != bson.Null {
*v = MakeString(bson.DecodeBinary(buf, kind))
}
}
func (v Value) IsNull() bool {
return v.Inner == nil
}
func (v Value) IsNumeric() (ok bool) {
if v.Inner != nil {
_, ok = v.Inner.(Numeric)
}
return ok
}
func (v Value) IsFractional() (ok bool) {
if v.Inner != nil {
_, ok = v.Inner.(Fractional)
}
return ok
}
func (v Value) IsString() (ok bool) {
if v.Inner != nil {
_, ok = v.Inner.(String)
}
return ok
}
// MarshalJSON should only be used for testing.
// It's not a complete implementation.
func (v Value) MarshalJSON() ([]byte, error) {
return json.Marshal(v.Inner)
}
// UnmarshalJSON should only be used for testing.
// It's not a complete implementation.
func (v *Value) UnmarshalJSON(b []byte) error {
if len(b) == 0 {
return fmt.Errorf("error unmarshaling empty bytes")
}
var val interface{}
var err error
switch b[0] {
case '-':
var ival int64
err = json.Unmarshal(b, &ival)
val = ival
case '"':
var bval []byte
err = json.Unmarshal(b, &bval)
val = bval
case 'n': // null
err = json.Unmarshal(b, &val)
default:
var uval uint64
err = json.Unmarshal(b, &uval)
val = uval
}
if err != nil {
return err
}
*v, err = BuildValue(val)
return err
}
// InnerValue defines methods that need to be supported by all non-null value types.
type InnerValue interface {
raw() []byte
encodeSql(BinWriter)
encodeAscii(BinWriter)
}
func BuildValue(goval interface{}) (v Value, err error) {
switch bindVal := goval.(type) {
case nil:
// no op
case int:
v = Value{Numeric(strconv.AppendInt(nil, int64(bindVal), 10))}
case int32:
v = Value{Numeric(strconv.AppendInt(nil, int64(bindVal), 10))}
case int64:
v = Value{Numeric(strconv.AppendInt(nil, int64(bindVal), 10))}
case uint:
v = Value{Numeric(strconv.AppendUint(nil, uint64(bindVal), 10))}
case uint32:
v = Value{Numeric(strconv.AppendUint(nil, uint64(bindVal), 10))}
case uint64:
v = Value{Numeric(strconv.AppendUint(nil, uint64(bindVal), 10))}
case float64:
v = Value{Fractional(strconv.AppendFloat(nil, bindVal, 'f', -1, 64))}
case string:
v = Value{String([]byte(bindVal))}
case []byte:
v = Value{String(bindVal)}
case time.Time:
v = Value{String([]byte(bindVal.Format("2006-01-02 15:04:05")))}
case Numeric, Fractional, String:
v = Value{bindVal.(InnerValue)}
case Value:
v = bindVal
default:
return Value{}, fmt.Errorf("unsupported bind variable type %T: %v", goval, goval)
}
return v, nil
}
// BuildNumeric builds a Numeric type that represents any whole number.
// It normalizes the representation to ensure 1:1 mapping between the
// number and its representation.
func BuildNumeric(val string) (n Value, err error) {
if val[0] == '-' || val[0] == '+' {
signed, err := strconv.ParseInt(val, 0, 64)
if err != nil {
return Value{}, err
}
n = Value{Numeric(strconv.AppendInt(nil, signed, 10))}
} else {
unsigned, err := strconv.ParseUint(val, 0, 64)
if err != nil {
return Value{}, err
}
n = Value{Numeric(strconv.AppendUint(nil, unsigned, 10))}
}
return n, nil
}
func (n Numeric) raw() []byte {
return []byte(n)
}
func (n Numeric) encodeSql(b BinWriter) {
if _, err := b.Write(n.raw()); err != nil {
panic(err)
}
}
func (n Numeric) encodeAscii(b BinWriter) {
if _, err := b.Write(n.raw()); err != nil {
panic(err)
}
}
func (n Numeric) MarshalJSON() ([]byte, error) {
return n.raw(), nil
}
func (f Fractional) raw() []byte {
return []byte(f)
}
func (f Fractional) encodeSql(b BinWriter) {
if _, err := b.Write(f.raw()); err != nil {
panic(err)
}
}
func (f Fractional) encodeAscii(b BinWriter) {
if _, err := b.Write(f.raw()); err != nil {
panic(err)
}
}
func (s String) raw() []byte {
return []byte(s)
}
func (s String) encodeSql(b BinWriter) {
writebyte(b, '\'')
for _, ch := range s.raw() {
if encodedChar := SqlEncodeMap[ch]; encodedChar == DONTESCAPE {
writebyte(b, ch)
} else {
writebyte(b, '\\')
writebyte(b, encodedChar)
}
}
writebyte(b, '\'')
}
func (s String) encodeAscii(b BinWriter) {
writebyte(b, '\'')
encoder := base64.NewEncoder(base64.StdEncoding, b)
encoder.Write(s.raw())
encoder.Close()
writebyte(b, '\'')
}
func writebyte(b BinWriter, c byte) {
if err := b.WriteByte(c); err != nil {
panic(err)
}
}
// SqlEncodeMap specifies how to escape binary data with '\'.
// Complies to http://dev.mysql.com/doc/refman/5.1/en/string-syntax.html
var SqlEncodeMap [256]byte
// SqlDecodeMap is the reverse of SqlEncodeMap
var SqlDecodeMap [256]byte
var encodeRef = map[byte]byte{
'\x00': '0',
'\'': '\'',
'"': '"',
'\b': 'b',
'\n': 'n',
'\r': 'r',
'\t': 't',
26: 'Z', // ctl-Z
'\\': '\\',
}
func init() {
for i := range SqlEncodeMap {
SqlEncodeMap[i] = DONTESCAPE
SqlDecodeMap[i] = DONTESCAPE
}
for i := range SqlEncodeMap {
if to, ok := encodeRef[byte(i)]; ok {
SqlEncodeMap[byte(i)] = to
SqlDecodeMap[to] = byte(i)
}
}
gob.Register(Numeric(nil))
gob.Register(Fractional(nil))
gob.Register(String(nil))
}
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