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869 lines
21 KiB
869 lines
21 KiB
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
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//
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// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at http://mozilla.org/MPL/2.0/.
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package mysql
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import (
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"crypto/tls"
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"database/sql"
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"database/sql/driver"
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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)
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// Registry for custom tls.Configs
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var (
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tlsConfigLock sync.RWMutex
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tlsConfigRegistry map[string]*tls.Config
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)
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// RegisterTLSConfig registers a custom tls.Config to be used with sql.Open.
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// Use the key as a value in the DSN where tls=value.
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//
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// Note: The provided tls.Config is exclusively owned by the driver after
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// registering it.
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//
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// rootCertPool := x509.NewCertPool()
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// pem, err := ioutil.ReadFile("/path/ca-cert.pem")
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// if err != nil {
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// log.Fatal(err)
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// }
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// if ok := rootCertPool.AppendCertsFromPEM(pem); !ok {
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// log.Fatal("Failed to append PEM.")
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// }
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// clientCert := make([]tls.Certificate, 0, 1)
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// certs, err := tls.LoadX509KeyPair("/path/client-cert.pem", "/path/client-key.pem")
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// if err != nil {
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// log.Fatal(err)
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// }
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// clientCert = append(clientCert, certs)
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// mysql.RegisterTLSConfig("custom", &tls.Config{
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// RootCAs: rootCertPool,
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// Certificates: clientCert,
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// })
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// db, err := sql.Open("mysql", "user@tcp(localhost:3306)/test?tls=custom")
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//
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func RegisterTLSConfig(key string, config *tls.Config) error {
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if _, isBool := readBool(key); isBool || strings.ToLower(key) == "skip-verify" || strings.ToLower(key) == "preferred" {
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return fmt.Errorf("key '%s' is reserved", key)
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}
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tlsConfigLock.Lock()
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if tlsConfigRegistry == nil {
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tlsConfigRegistry = make(map[string]*tls.Config)
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}
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tlsConfigRegistry[key] = config
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tlsConfigLock.Unlock()
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return nil
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}
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// DeregisterTLSConfig removes the tls.Config associated with key.
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func DeregisterTLSConfig(key string) {
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tlsConfigLock.Lock()
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if tlsConfigRegistry != nil {
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delete(tlsConfigRegistry, key)
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}
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tlsConfigLock.Unlock()
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}
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func getTLSConfigClone(key string) (config *tls.Config) {
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tlsConfigLock.RLock()
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if v, ok := tlsConfigRegistry[key]; ok {
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config = v.Clone()
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}
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tlsConfigLock.RUnlock()
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return
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}
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// Returns the bool value of the input.
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// The 2nd return value indicates if the input was a valid bool value
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func readBool(input string) (value bool, valid bool) {
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switch input {
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case "1", "true", "TRUE", "True":
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return true, true
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case "0", "false", "FALSE", "False":
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return false, true
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}
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// Not a valid bool value
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return
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}
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/******************************************************************************
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* Time related utils *
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******************************************************************************/
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func parseDateTime(b []byte, loc *time.Location) (time.Time, error) {
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const base = "0000-00-00 00:00:00.000000"
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switch len(b) {
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case 10, 19, 21, 22, 23, 24, 25, 26: // up to "YYYY-MM-DD HH:MM:SS.MMMMMM"
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if string(b) == base[:len(b)] {
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return time.Time{}, nil
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}
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year, err := parseByteYear(b)
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if err != nil {
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return time.Time{}, err
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}
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if year <= 0 {
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year = 1
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}
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if b[4] != '-' {
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return time.Time{}, fmt.Errorf("bad value for field: `%c`", b[4])
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}
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m, err := parseByte2Digits(b[5], b[6])
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if err != nil {
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return time.Time{}, err
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}
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if m <= 0 {
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m = 1
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}
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month := time.Month(m)
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if b[7] != '-' {
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return time.Time{}, fmt.Errorf("bad value for field: `%c`", b[7])
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}
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day, err := parseByte2Digits(b[8], b[9])
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if err != nil {
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return time.Time{}, err
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}
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if day <= 0 {
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day = 1
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}
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if len(b) == 10 {
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return time.Date(year, month, day, 0, 0, 0, 0, loc), nil
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}
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if b[10] != ' ' {
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return time.Time{}, fmt.Errorf("bad value for field: `%c`", b[10])
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}
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hour, err := parseByte2Digits(b[11], b[12])
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if err != nil {
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return time.Time{}, err
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}
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if b[13] != ':' {
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return time.Time{}, fmt.Errorf("bad value for field: `%c`", b[13])
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}
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min, err := parseByte2Digits(b[14], b[15])
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if err != nil {
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return time.Time{}, err
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}
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if b[16] != ':' {
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return time.Time{}, fmt.Errorf("bad value for field: `%c`", b[16])
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}
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sec, err := parseByte2Digits(b[17], b[18])
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if err != nil {
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return time.Time{}, err
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}
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if len(b) == 19 {
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return time.Date(year, month, day, hour, min, sec, 0, loc), nil
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}
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if b[19] != '.' {
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return time.Time{}, fmt.Errorf("bad value for field: `%c`", b[19])
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}
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nsec, err := parseByteNanoSec(b[20:])
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if err != nil {
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return time.Time{}, err
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}
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return time.Date(year, month, day, hour, min, sec, nsec, loc), nil
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default:
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return time.Time{}, fmt.Errorf("invalid time bytes: %s", b)
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}
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}
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func parseByteYear(b []byte) (int, error) {
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year, n := 0, 1000
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for i := 0; i < 4; i++ {
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v, err := bToi(b[i])
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if err != nil {
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return 0, err
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}
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year += v * n
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n = n / 10
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}
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return year, nil
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}
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func parseByte2Digits(b1, b2 byte) (int, error) {
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d1, err := bToi(b1)
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if err != nil {
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return 0, err
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}
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d2, err := bToi(b2)
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if err != nil {
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return 0, err
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}
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return d1*10 + d2, nil
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}
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func parseByteNanoSec(b []byte) (int, error) {
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ns, digit := 0, 100000 // max is 6-digits
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for i := 0; i < len(b); i++ {
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v, err := bToi(b[i])
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if err != nil {
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return 0, err
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}
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ns += v * digit
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digit /= 10
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}
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// nanoseconds has 10-digits. (needs to scale digits)
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// 10 - 6 = 4, so we have to multiple 1000.
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return ns * 1000, nil
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}
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func bToi(b byte) (int, error) {
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if b < '0' || b > '9' {
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return 0, errors.New("not [0-9]")
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}
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return int(b - '0'), nil
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}
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func parseBinaryDateTime(num uint64, data []byte, loc *time.Location) (driver.Value, error) {
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switch num {
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case 0:
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return time.Time{}, nil
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case 4:
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return time.Date(
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int(binary.LittleEndian.Uint16(data[:2])), // year
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time.Month(data[2]), // month
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int(data[3]), // day
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0, 0, 0, 0,
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loc,
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), nil
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case 7:
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return time.Date(
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int(binary.LittleEndian.Uint16(data[:2])), // year
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time.Month(data[2]), // month
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int(data[3]), // day
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int(data[4]), // hour
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int(data[5]), // minutes
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int(data[6]), // seconds
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0,
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loc,
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), nil
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case 11:
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return time.Date(
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int(binary.LittleEndian.Uint16(data[:2])), // year
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time.Month(data[2]), // month
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int(data[3]), // day
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int(data[4]), // hour
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int(data[5]), // minutes
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int(data[6]), // seconds
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int(binary.LittleEndian.Uint32(data[7:11]))*1000, // nanoseconds
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loc,
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), nil
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}
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return nil, fmt.Errorf("invalid DATETIME packet length %d", num)
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}
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func appendDateTime(buf []byte, t time.Time) ([]byte, error) {
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year, month, day := t.Date()
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hour, min, sec := t.Clock()
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nsec := t.Nanosecond()
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if year < 1 || year > 9999 {
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return buf, errors.New("year is not in the range [1, 9999]: " + strconv.Itoa(year)) // use errors.New instead of fmt.Errorf to avoid year escape to heap
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}
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year100 := year / 100
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year1 := year % 100
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var localBuf [len("2006-01-02T15:04:05.999999999")]byte // does not escape
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localBuf[0], localBuf[1], localBuf[2], localBuf[3] = digits10[year100], digits01[year100], digits10[year1], digits01[year1]
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localBuf[4] = '-'
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localBuf[5], localBuf[6] = digits10[month], digits01[month]
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localBuf[7] = '-'
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localBuf[8], localBuf[9] = digits10[day], digits01[day]
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if hour == 0 && min == 0 && sec == 0 && nsec == 0 {
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return append(buf, localBuf[:10]...), nil
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}
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localBuf[10] = ' '
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localBuf[11], localBuf[12] = digits10[hour], digits01[hour]
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localBuf[13] = ':'
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localBuf[14], localBuf[15] = digits10[min], digits01[min]
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localBuf[16] = ':'
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localBuf[17], localBuf[18] = digits10[sec], digits01[sec]
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if nsec == 0 {
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return append(buf, localBuf[:19]...), nil
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}
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nsec100000000 := nsec / 100000000
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nsec1000000 := (nsec / 1000000) % 100
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nsec10000 := (nsec / 10000) % 100
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nsec100 := (nsec / 100) % 100
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nsec1 := nsec % 100
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localBuf[19] = '.'
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// milli second
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localBuf[20], localBuf[21], localBuf[22] =
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digits01[nsec100000000], digits10[nsec1000000], digits01[nsec1000000]
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// micro second
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localBuf[23], localBuf[24], localBuf[25] =
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digits10[nsec10000], digits01[nsec10000], digits10[nsec100]
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// nano second
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localBuf[26], localBuf[27], localBuf[28] =
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digits01[nsec100], digits10[nsec1], digits01[nsec1]
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// trim trailing zeros
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n := len(localBuf)
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for n > 0 && localBuf[n-1] == '0' {
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n--
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}
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return append(buf, localBuf[:n]...), nil
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}
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// zeroDateTime is used in formatBinaryDateTime to avoid an allocation
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// if the DATE or DATETIME has the zero value.
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// It must never be changed.
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// The current behavior depends on database/sql copying the result.
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var zeroDateTime = []byte("0000-00-00 00:00:00.000000")
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const digits01 = "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789"
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const digits10 = "0000000000111111111122222222223333333333444444444455555555556666666666777777777788888888889999999999"
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func appendMicrosecs(dst, src []byte, decimals int) []byte {
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if decimals <= 0 {
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return dst
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}
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if len(src) == 0 {
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return append(dst, ".000000"[:decimals+1]...)
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}
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microsecs := binary.LittleEndian.Uint32(src[:4])
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p1 := byte(microsecs / 10000)
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microsecs -= 10000 * uint32(p1)
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p2 := byte(microsecs / 100)
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microsecs -= 100 * uint32(p2)
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p3 := byte(microsecs)
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switch decimals {
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default:
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return append(dst, '.',
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digits10[p1], digits01[p1],
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digits10[p2], digits01[p2],
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digits10[p3], digits01[p3],
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)
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case 1:
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return append(dst, '.',
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digits10[p1],
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)
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case 2:
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return append(dst, '.',
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digits10[p1], digits01[p1],
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)
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case 3:
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return append(dst, '.',
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digits10[p1], digits01[p1],
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digits10[p2],
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)
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case 4:
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return append(dst, '.',
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digits10[p1], digits01[p1],
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digits10[p2], digits01[p2],
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)
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case 5:
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return append(dst, '.',
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digits10[p1], digits01[p1],
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digits10[p2], digits01[p2],
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digits10[p3],
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)
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}
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}
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func formatBinaryDateTime(src []byte, length uint8) (driver.Value, error) {
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// length expects the deterministic length of the zero value,
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// negative time and 100+ hours are automatically added if needed
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if len(src) == 0 {
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return zeroDateTime[:length], nil
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}
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var dst []byte // return value
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var p1, p2, p3 byte // current digit pair
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switch length {
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case 10, 19, 21, 22, 23, 24, 25, 26:
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default:
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t := "DATE"
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if length > 10 {
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t += "TIME"
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}
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return nil, fmt.Errorf("illegal %s length %d", t, length)
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}
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switch len(src) {
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case 4, 7, 11:
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default:
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t := "DATE"
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if length > 10 {
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t += "TIME"
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}
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return nil, fmt.Errorf("illegal %s packet length %d", t, len(src))
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}
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dst = make([]byte, 0, length)
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// start with the date
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year := binary.LittleEndian.Uint16(src[:2])
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pt := year / 100
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p1 = byte(year - 100*uint16(pt))
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p2, p3 = src[2], src[3]
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dst = append(dst,
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digits10[pt], digits01[pt],
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digits10[p1], digits01[p1], '-',
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digits10[p2], digits01[p2], '-',
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digits10[p3], digits01[p3],
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)
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if length == 10 {
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return dst, nil
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}
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if len(src) == 4 {
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return append(dst, zeroDateTime[10:length]...), nil
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}
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dst = append(dst, ' ')
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p1 = src[4] // hour
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src = src[5:]
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// p1 is 2-digit hour, src is after hour
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p2, p3 = src[0], src[1]
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dst = append(dst,
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digits10[p1], digits01[p1], ':',
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digits10[p2], digits01[p2], ':',
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digits10[p3], digits01[p3],
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)
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return appendMicrosecs(dst, src[2:], int(length)-20), nil
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}
|
|
|
|
func formatBinaryTime(src []byte, length uint8) (driver.Value, error) {
|
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// length expects the deterministic length of the zero value,
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|
// negative time and 100+ hours are automatically added if needed
|
|
if len(src) == 0 {
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return zeroDateTime[11 : 11+length], nil
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}
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var dst []byte // return value
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|
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switch length {
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case
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8, // time (can be up to 10 when negative and 100+ hours)
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10, 11, 12, 13, 14, 15: // time with fractional seconds
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default:
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return nil, fmt.Errorf("illegal TIME length %d", length)
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}
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switch len(src) {
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case 8, 12:
|
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default:
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return nil, fmt.Errorf("invalid TIME packet length %d", len(src))
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}
|
|
// +2 to enable negative time and 100+ hours
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dst = make([]byte, 0, length+2)
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if src[0] == 1 {
|
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dst = append(dst, '-')
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}
|
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days := binary.LittleEndian.Uint32(src[1:5])
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hours := int64(days)*24 + int64(src[5])
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|
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if hours >= 100 {
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dst = strconv.AppendInt(dst, hours, 10)
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} else {
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dst = append(dst, digits10[hours], digits01[hours])
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}
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min, sec := src[6], src[7]
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dst = append(dst, ':',
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digits10[min], digits01[min], ':',
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digits10[sec], digits01[sec],
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)
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return appendMicrosecs(dst, src[8:], int(length)-9), nil
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|
}
|
|
|
|
/******************************************************************************
|
|
* Convert from and to bytes *
|
|
******************************************************************************/
|
|
|
|
func uint64ToBytes(n uint64) []byte {
|
|
return []byte{
|
|
byte(n),
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|
byte(n >> 8),
|
|
byte(n >> 16),
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|
byte(n >> 24),
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|
byte(n >> 32),
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|
byte(n >> 40),
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|
byte(n >> 48),
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byte(n >> 56),
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}
|
|
}
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|
|
|
func uint64ToString(n uint64) []byte {
|
|
var a [20]byte
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|
i := 20
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|
|
|
// U+0030 = 0
|
|
// ...
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|
// U+0039 = 9
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|
|
|
var q uint64
|
|
for n >= 10 {
|
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i--
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|
q = n / 10
|
|
a[i] = uint8(n-q*10) + 0x30
|
|
n = q
|
|
}
|
|
|
|
i--
|
|
a[i] = uint8(n) + 0x30
|
|
|
|
return a[i:]
|
|
}
|
|
|
|
// treats string value as unsigned integer representation
|
|
func stringToInt(b []byte) int {
|
|
val := 0
|
|
for i := range b {
|
|
val *= 10
|
|
val += int(b[i] - 0x30)
|
|
}
|
|
return val
|
|
}
|
|
|
|
// returns the string read as a bytes slice, wheter the value is NULL,
|
|
// the number of bytes read and an error, in case the string is longer than
|
|
// the input slice
|
|
func readLengthEncodedString(b []byte) ([]byte, bool, int, error) {
|
|
// Get length
|
|
num, isNull, n := readLengthEncodedInteger(b)
|
|
if num < 1 {
|
|
return b[n:n], isNull, n, nil
|
|
}
|
|
|
|
n += int(num)
|
|
|
|
// Check data length
|
|
if len(b) >= n {
|
|
return b[n-int(num) : n : n], false, n, nil
|
|
}
|
|
return nil, false, n, io.EOF
|
|
}
|
|
|
|
// returns the number of bytes skipped and an error, in case the string is
|
|
// longer than the input slice
|
|
func skipLengthEncodedString(b []byte) (int, error) {
|
|
// Get length
|
|
num, _, n := readLengthEncodedInteger(b)
|
|
if num < 1 {
|
|
return n, nil
|
|
}
|
|
|
|
n += int(num)
|
|
|
|
// Check data length
|
|
if len(b) >= n {
|
|
return n, nil
|
|
}
|
|
return n, io.EOF
|
|
}
|
|
|
|
// returns the number read, whether the value is NULL and the number of bytes read
|
|
func readLengthEncodedInteger(b []byte) (uint64, bool, int) {
|
|
// See issue #349
|
|
if len(b) == 0 {
|
|
return 0, true, 1
|
|
}
|
|
|
|
switch b[0] {
|
|
// 251: NULL
|
|
case 0xfb:
|
|
return 0, true, 1
|
|
|
|
// 252: value of following 2
|
|
case 0xfc:
|
|
return uint64(b[1]) | uint64(b[2])<<8, false, 3
|
|
|
|
// 253: value of following 3
|
|
case 0xfd:
|
|
return uint64(b[1]) | uint64(b[2])<<8 | uint64(b[3])<<16, false, 4
|
|
|
|
// 254: value of following 8
|
|
case 0xfe:
|
|
return uint64(b[1]) | uint64(b[2])<<8 | uint64(b[3])<<16 |
|
|
uint64(b[4])<<24 | uint64(b[5])<<32 | uint64(b[6])<<40 |
|
|
uint64(b[7])<<48 | uint64(b[8])<<56,
|
|
false, 9
|
|
}
|
|
|
|
// 0-250: value of first byte
|
|
return uint64(b[0]), false, 1
|
|
}
|
|
|
|
// encodes a uint64 value and appends it to the given bytes slice
|
|
func appendLengthEncodedInteger(b []byte, n uint64) []byte {
|
|
switch {
|
|
case n <= 250:
|
|
return append(b, byte(n))
|
|
|
|
case n <= 0xffff:
|
|
return append(b, 0xfc, byte(n), byte(n>>8))
|
|
|
|
case n <= 0xffffff:
|
|
return append(b, 0xfd, byte(n), byte(n>>8), byte(n>>16))
|
|
}
|
|
return append(b, 0xfe, byte(n), byte(n>>8), byte(n>>16), byte(n>>24),
|
|
byte(n>>32), byte(n>>40), byte(n>>48), byte(n>>56))
|
|
}
|
|
|
|
// reserveBuffer checks cap(buf) and expand buffer to len(buf) + appendSize.
|
|
// If cap(buf) is not enough, reallocate new buffer.
|
|
func reserveBuffer(buf []byte, appendSize int) []byte {
|
|
newSize := len(buf) + appendSize
|
|
if cap(buf) < newSize {
|
|
// Grow buffer exponentially
|
|
newBuf := make([]byte, len(buf)*2+appendSize)
|
|
copy(newBuf, buf)
|
|
buf = newBuf
|
|
}
|
|
return buf[:newSize]
|
|
}
|
|
|
|
// escapeBytesBackslash escapes []byte with backslashes (\)
|
|
// This escapes the contents of a string (provided as []byte) by adding backslashes before special
|
|
// characters, and turning others into specific escape sequences, such as
|
|
// turning newlines into \n and null bytes into \0.
|
|
// https://github.com/mysql/mysql-server/blob/mysql-5.7.5/mysys/charset.c#L823-L932
|
|
func escapeBytesBackslash(buf, v []byte) []byte {
|
|
pos := len(buf)
|
|
buf = reserveBuffer(buf, len(v)*2)
|
|
|
|
for _, c := range v {
|
|
switch c {
|
|
case '\x00':
|
|
buf[pos] = '\\'
|
|
buf[pos+1] = '0'
|
|
pos += 2
|
|
case '\n':
|
|
buf[pos] = '\\'
|
|
buf[pos+1] = 'n'
|
|
pos += 2
|
|
case '\r':
|
|
buf[pos] = '\\'
|
|
buf[pos+1] = 'r'
|
|
pos += 2
|
|
case '\x1a':
|
|
buf[pos] = '\\'
|
|
buf[pos+1] = 'Z'
|
|
pos += 2
|
|
case '\'':
|
|
buf[pos] = '\\'
|
|
buf[pos+1] = '\''
|
|
pos += 2
|
|
case '"':
|
|
buf[pos] = '\\'
|
|
buf[pos+1] = '"'
|
|
pos += 2
|
|
case '\\':
|
|
buf[pos] = '\\'
|
|
buf[pos+1] = '\\'
|
|
pos += 2
|
|
default:
|
|
buf[pos] = c
|
|
pos++
|
|
}
|
|
}
|
|
|
|
return buf[:pos]
|
|
}
|
|
|
|
// escapeStringBackslash is similar to escapeBytesBackslash but for string.
|
|
func escapeStringBackslash(buf []byte, v string) []byte {
|
|
pos := len(buf)
|
|
buf = reserveBuffer(buf, len(v)*2)
|
|
|
|
for i := 0; i < len(v); i++ {
|
|
c := v[i]
|
|
switch c {
|
|
case '\x00':
|
|
buf[pos] = '\\'
|
|
buf[pos+1] = '0'
|
|
pos += 2
|
|
case '\n':
|
|
buf[pos] = '\\'
|
|
buf[pos+1] = 'n'
|
|
pos += 2
|
|
case '\r':
|
|
buf[pos] = '\\'
|
|
buf[pos+1] = 'r'
|
|
pos += 2
|
|
case '\x1a':
|
|
buf[pos] = '\\'
|
|
buf[pos+1] = 'Z'
|
|
pos += 2
|
|
case '\'':
|
|
buf[pos] = '\\'
|
|
buf[pos+1] = '\''
|
|
pos += 2
|
|
case '"':
|
|
buf[pos] = '\\'
|
|
buf[pos+1] = '"'
|
|
pos += 2
|
|
case '\\':
|
|
buf[pos] = '\\'
|
|
buf[pos+1] = '\\'
|
|
pos += 2
|
|
default:
|
|
buf[pos] = c
|
|
pos++
|
|
}
|
|
}
|
|
|
|
return buf[:pos]
|
|
}
|
|
|
|
// escapeBytesQuotes escapes apostrophes in []byte by doubling them up.
|
|
// This escapes the contents of a string by doubling up any apostrophes that
|
|
// it contains. This is used when the NO_BACKSLASH_ESCAPES SQL_MODE is in
|
|
// effect on the server.
|
|
// https://github.com/mysql/mysql-server/blob/mysql-5.7.5/mysys/charset.c#L963-L1038
|
|
func escapeBytesQuotes(buf, v []byte) []byte {
|
|
pos := len(buf)
|
|
buf = reserveBuffer(buf, len(v)*2)
|
|
|
|
for _, c := range v {
|
|
if c == '\'' {
|
|
buf[pos] = '\''
|
|
buf[pos+1] = '\''
|
|
pos += 2
|
|
} else {
|
|
buf[pos] = c
|
|
pos++
|
|
}
|
|
}
|
|
|
|
return buf[:pos]
|
|
}
|
|
|
|
// escapeStringQuotes is similar to escapeBytesQuotes but for string.
|
|
func escapeStringQuotes(buf []byte, v string) []byte {
|
|
pos := len(buf)
|
|
buf = reserveBuffer(buf, len(v)*2)
|
|
|
|
for i := 0; i < len(v); i++ {
|
|
c := v[i]
|
|
if c == '\'' {
|
|
buf[pos] = '\''
|
|
buf[pos+1] = '\''
|
|
pos += 2
|
|
} else {
|
|
buf[pos] = c
|
|
pos++
|
|
}
|
|
}
|
|
|
|
return buf[:pos]
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Sync utils *
|
|
******************************************************************************/
|
|
|
|
// noCopy may be embedded into structs which must not be copied
|
|
// after the first use.
|
|
//
|
|
// See https://github.com/golang/go/issues/8005#issuecomment-190753527
|
|
// for details.
|
|
type noCopy struct{}
|
|
|
|
// Lock is a no-op used by -copylocks checker from `go vet`.
|
|
func (*noCopy) Lock() {}
|
|
|
|
// atomicBool is a wrapper around uint32 for usage as a boolean value with
|
|
// atomic access.
|
|
type atomicBool struct {
|
|
_noCopy noCopy
|
|
value uint32
|
|
}
|
|
|
|
// IsSet returns whether the current boolean value is true
|
|
func (ab *atomicBool) IsSet() bool {
|
|
return atomic.LoadUint32(&ab.value) > 0
|
|
}
|
|
|
|
// Set sets the value of the bool regardless of the previous value
|
|
func (ab *atomicBool) Set(value bool) {
|
|
if value {
|
|
atomic.StoreUint32(&ab.value, 1)
|
|
} else {
|
|
atomic.StoreUint32(&ab.value, 0)
|
|
}
|
|
}
|
|
|
|
// TrySet sets the value of the bool and returns whether the value changed
|
|
func (ab *atomicBool) TrySet(value bool) bool {
|
|
if value {
|
|
return atomic.SwapUint32(&ab.value, 1) == 0
|
|
}
|
|
return atomic.SwapUint32(&ab.value, 0) > 0
|
|
}
|
|
|
|
// atomicError is a wrapper for atomically accessed error values
|
|
type atomicError struct {
|
|
_noCopy noCopy
|
|
value atomic.Value
|
|
}
|
|
|
|
// Set sets the error value regardless of the previous value.
|
|
// The value must not be nil
|
|
func (ae *atomicError) Set(value error) {
|
|
ae.value.Store(value)
|
|
}
|
|
|
|
// Value returns the current error value
|
|
func (ae *atomicError) Value() error {
|
|
if v := ae.value.Load(); v != nil {
|
|
// this will panic if the value doesn't implement the error interface
|
|
return v.(error)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func namedValueToValue(named []driver.NamedValue) ([]driver.Value, error) {
|
|
dargs := make([]driver.Value, len(named))
|
|
for n, param := range named {
|
|
if len(param.Name) > 0 {
|
|
// TODO: support the use of Named Parameters #561
|
|
return nil, errors.New("mysql: driver does not support the use of Named Parameters")
|
|
}
|
|
dargs[n] = param.Value
|
|
}
|
|
return dargs, nil
|
|
}
|
|
|
|
func mapIsolationLevel(level driver.IsolationLevel) (string, error) {
|
|
switch sql.IsolationLevel(level) {
|
|
case sql.LevelRepeatableRead:
|
|
return "REPEATABLE READ", nil
|
|
case sql.LevelReadCommitted:
|
|
return "READ COMMITTED", nil
|
|
case sql.LevelReadUncommitted:
|
|
return "READ UNCOMMITTED", nil
|
|
case sql.LevelSerializable:
|
|
return "SERIALIZABLE", nil
|
|
default:
|
|
return "", fmt.Errorf("mysql: unsupported isolation level: %v", level)
|
|
}
|
|
}
|