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append.go
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append.go
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package pg
import (
"database/sql/driver"
"encoding/hex"
"fmt"
"log"
"reflect"
"strconv"
"time"
"gopkg.in/pg.v3/pgutil"
)
func AppendQ(dst []byte, src string, params ...interface{}) ([]byte, error) {
return formatQuery(dst, []byte(src), params)
}
func FormatQ(src string, params ...interface{}) (Q, error) {
b, err := AppendQ(nil, src, params...)
if err != nil {
return "", err
}
return Q(b), nil
}
func MustFormatQ(src string, params ...interface{}) Q {
q, err := FormatQ(src, params...)
if err != nil {
panic(err)
}
return q
}
func appendIface(b []byte, vi interface{}, quote bool) []byte {
switch v := vi.(type) {
case nil:
return appendNull(b, quote)
case bool:
return appendBool(b, v)
case int8:
return strconv.AppendInt(b, int64(v), 10)
case int16:
return strconv.AppendInt(b, int64(v), 10)
case int32:
return strconv.AppendInt(b, int64(v), 10)
case int64:
return strconv.AppendInt(b, int64(v), 10)
case int:
return strconv.AppendInt(b, int64(v), 10)
case uint8:
return strconv.AppendUint(b, uint64(v), 10)
case uint16:
return strconv.AppendUint(b, uint64(v), 10)
case uint32:
return strconv.AppendUint(b, uint64(v), 10)
case uint64:
return strconv.AppendUint(b, v, 10)
case uint:
return strconv.AppendUint(b, uint64(v), 10)
case float32:
return appendFloat(b, float64(v))
case float64:
return appendFloat(b, v)
case string:
return appendString(b, v, quote)
case time.Time:
return appendTime(b, v, quote)
case []byte:
return appendBytes(b, v, quote)
case []string:
return appendStringSlice(b, v, quote)
case []int:
return appendIntSlice(b, v, quote)
case []int64:
return appendInt64Slice(b, v, quote)
case []float64:
return appendFloat64Slice(b, v, quote)
case map[string]string:
return appendStringStringMap(b, v, quote)
case QueryAppender:
return v.AppendQuery(b)
case driver.Valuer:
return appendDriverValuer(b, v, quote)
default:
return appendValue(b, reflect.ValueOf(vi), quote)
}
}
func appendValue(b []byte, v reflect.Value, quote bool) []byte {
switch kind := v.Kind(); kind {
case reflect.Ptr:
if v.IsNil() {
return appendNull(b, quote)
}
return appendValue(b, v.Elem(), quote)
default:
if appender := valueAppenders[kind]; appender != nil {
return appender(b, v, quote)
}
}
panic(fmt.Sprintf("pg: Format(unsupported %s)", v.Type()))
}
func appendNull(b []byte, quote bool) []byte {
if quote {
return append(b, "NULL"...)
} else {
return nil
}
}
func appendBool(dst []byte, v bool) []byte {
if v {
return append(dst, "TRUE"...)
}
return append(dst, "FALSE"...)
}
func appendFloat(dst []byte, v float64) []byte {
return strconv.AppendFloat(dst, v, 'f', -1, 64)
}
func appendString(b []byte, s string, quote bool) []byte {
return appendStringBytes(b, []byte(s), quote)
}
func appendStringBytes(b []byte, bytes []byte, quote bool) []byte {
if quote {
b = append(b, '\'')
}
for _, c := range bytes {
switch c {
case '\'':
if quote {
b = append(b, '\'', '\'')
} else {
b = append(b, '\'')
}
case '\000':
continue
default:
b = append(b, c)
}
}
if quote {
b = append(b, '\'')
}
return b
}
func appendSubstring(b []byte, src string, quote bool) []byte {
b = append(b, '"')
for _, c := range []byte(src) {
switch c {
case '\'':
if quote {
b = append(b, '\'', '\'')
} else {
b = append(b, '\'')
}
case '\000':
continue
case '\\':
b = append(b, '\\', '\\')
case '"':
b = append(b, '\\', '"')
default:
b = append(b, c)
}
}
b = append(b, '"')
return b
}
func appendBytes(b []byte, bytes []byte, quote bool) []byte {
if bytes == nil {
return appendNull(b, quote)
}
if quote {
b = append(b, '\'')
}
tmp := make([]byte, hex.EncodedLen(len(bytes)))
hex.Encode(tmp, bytes)
b = append(b, "\\x"...)
b = append(b, tmp...)
if quote {
b = append(b, '\'')
}
return b
}
func appendStringStringMap(b []byte, m map[string]string, quote bool) []byte {
if m == nil {
return appendNull(b, quote)
}
if quote {
b = append(b, '\'')
}
for key, value := range m {
b = appendSubstring(b, key, quote)
b = append(b, '=', '>')
b = appendSubstring(b, value, quote)
b = append(b, ',')
}
if len(m) > 0 {
b = b[:len(b)-1] // Strip trailing comma.
}
if quote {
b = append(b, '\'')
}
return b
}
func appendStringSlice(b []byte, ss []string, quote bool) []byte {
if ss == nil {
return appendNull(b, quote)
}
if quote {
b = append(b, '\'')
}
b = append(b, '{')
for _, s := range ss {
b = appendSubstring(b, s, quote)
b = append(b, ',')
}
if len(ss) > 0 {
b[len(b)-1] = '}' // Replace trailing comma.
} else {
b = append(b, '}')
}
if quote {
b = append(b, '\'')
}
return b
}
func appendIntSlice(b []byte, ints []int, quote bool) []byte {
if ints == nil {
return appendNull(b, quote)
}
if quote {
b = append(b, '\'')
}
b = append(b, '{')
for _, n := range ints {
b = strconv.AppendInt(b, int64(n), 10)
b = append(b, ',')
}
if len(ints) > 0 {
b[len(b)-1] = '}' // Replace trailing comma.
} else {
b = append(b, '}')
}
if quote {
b = append(b, '\'')
}
return b
}
func appendInt64Slice(b []byte, ints []int64, quote bool) []byte {
if ints == nil {
return appendNull(b, quote)
}
if quote {
b = append(b, '\'')
}
b = append(b, "{"...)
for _, n := range ints {
b = strconv.AppendInt(b, n, 10)
b = append(b, ',')
}
if len(ints) > 0 {
b[len(b)-1] = '}' // Replace trailing comma.
} else {
b = append(b, '}')
}
if quote {
b = append(b, '\'')
}
return b
}
func appendFloat64Slice(b []byte, floats []float64, quote bool) []byte {
if floats == nil {
return appendNull(b, quote)
}
if quote {
b = append(b, '\'')
}
b = append(b, "{"...)
for _, n := range floats {
b = appendFloat(b, n)
b = append(b, ',')
}
if len(floats) > 0 {
b[len(b)-1] = '}' // Replace trailing comma.
} else {
b = append(b, '}')
}
if quote {
b = append(b, '\'')
}
return b
}
func appendDriverValuer(b []byte, v driver.Valuer, quote bool) []byte {
value, err := v.Value()
if err != nil {
log.Printf("%T value failed: %s", v, err)
return appendNull(b, quote)
}
return appendIface(b, value, quote)
}
func appendField(b []byte, f string) []byte {
b = append(b, '"')
for _, c := range []byte(f) {
if c == '"' {
b = append(b, '"', '"')
} else {
b = append(b, c)
}
}
b = append(b, '"')
return b
}
func appendTime(b []byte, tm time.Time, quote bool) []byte {
if quote {
b = append(b, '\'')
}
b = pgutil.AppendTime(b, tm)
if quote {
b = append(b, '\'')
}
return b
}
//------------------------------------------------------------------------------
func formatQuery(dst, src []byte, params []interface{}) ([]byte, error) {
if len(params) == 0 {
return append(dst, src...), nil
}
var model *Model
var paramInd int
p := &parser{b: src}
for p.Valid() {
ch := p.Next()
if ch == '\\' {
if p.Peek() == '?' {
p.SkipNext()
dst = append(dst, '?')
continue
}
} else if ch != '?' {
dst = append(dst, ch)
continue
}
name := p.ReadName()
if name != "" {
// Lazily initialize Model.
if model == nil {
if len(params) == 0 {
return nil, errorf("pg: expected at least one parameter, got nothing")
}
last := params[len(params)-1]
params = params[:len(params)-1]
if v, ok := last.(*Model); ok {
model = v
} else {
model = NewModel(last, "")
}
}
var err error
dst, err = model.appendName(dst, name)
if err != nil {
return nil, err
}
} else {
if paramInd >= len(params) {
return nil, errorf(
"pg: expected at least %d parameters, got %d",
paramInd+1, len(params),
)
}
dst = appendIface(dst, params[paramInd], true)
paramInd++
}
}
if paramInd < len(params) {
return nil, errorf("pg: expected %d parameters, got %d", paramInd, len(params))
}
return dst, nil
}