-
Notifications
You must be signed in to change notification settings - Fork 4
/
interpolate_params.go
188 lines (171 loc) · 3.96 KB
/
interpolate_params.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
package mysqlconnector
import (
"database/sql/driver"
"errors"
"strconv"
"strings"
"time"
)
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 interpolateParams(query string, args []driver.Value, loc *time.Location, maxAllowedPacket int) (string, error) {
if strings.Count(query, "?") != len(args) {
return "", driver.ErrSkip
}
buf := make([]byte, 0)
buf = buf[:0]
argPos := 0
for i := 0; i < len(query); i++ {
q := strings.IndexByte(query[i:], '?')
if q == -1 {
buf = append(buf, query[i:]...)
break
}
buf = append(buf, query[i:i+q]...)
i += q
arg := args[argPos]
argPos++
if arg == nil {
buf = append(buf, "NULL"...)
continue
}
switch v := arg.(type) {
case int64:
buf = strconv.AppendInt(buf, v, 10)
case float64:
buf = strconv.AppendFloat(buf, v, 'g', -1, 64)
case bool:
if v {
buf = append(buf, '1')
} else {
buf = append(buf, '0')
}
case time.Time:
if v.IsZero() {
buf = append(buf, "'0000-00-00'"...)
} else {
v := v.In(loc)
v = v.Add(time.Nanosecond * 500) // Write round under microsecond
year := v.Year()
year100 := year / 100
year1 := year % 100
month := v.Month()
day := v.Day()
hour := v.Hour()
minute := v.Minute()
second := v.Second()
micro := v.Nanosecond() / 1000
buf = append(buf, []byte{
'\'',
digits10[year100], digits01[year100],
digits10[year1], digits01[year1],
'-',
digits10[month], digits01[month],
'-',
digits10[day], digits01[day],
' ',
digits10[hour], digits01[hour],
':',
digits10[minute], digits01[minute],
':',
digits10[second], digits01[second],
}...)
if micro != 0 {
micro10000 := micro / 10000
micro100 := micro / 100 % 100
micro1 := micro % 100
buf = append(buf, []byte{
'.',
digits10[micro10000], digits01[micro10000],
digits10[micro100], digits01[micro100],
digits10[micro1], digits01[micro1],
}...)
}
buf = append(buf, '\'')
}
case []byte:
if v == nil {
buf = append(buf, "NULL"...)
} else {
buf = append(buf, "_binary'"...)
buf = escapeBytesBackslash(buf, v)
buf = append(buf, '\'')
}
case string:
buf = append(buf, '\'')
buf = escapeBytesBackslash(buf, []byte(v))
buf = append(buf, '\'')
default:
return "", driver.ErrSkip
}
if len(buf)+4 > maxAllowedPacket {
return "", driver.ErrSkip
}
}
if argPos != len(args) {
return "", driver.ErrSkip
}
return string(buf), nil
}
// copy from mysql driver
const digits01 = "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789"
const digits10 = "0000000000111111111122222222223333333333444444444455555555556666666666777777777788888888889999999999"
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]
}
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]
}