TUN-2243: Revert "STOR-519: Add db-connect, a SQL over HTTPS server"

This reverts commit 5da2109811.

vendor/github.com/kshvakov/clickhouse/helpers.go

@@ -1,122 +0,0 @@
-package clickhouse
-
-import (
-	"bytes"
-	"database/sql/driver"
-	"fmt"
-	"reflect"
-	"regexp"
-	"strings"
-	"time"
-)
-
-func numInput(query string) int {
-
-	var (
-		count          int
-		args           = make(map[string]struct{})
-		reader         = bytes.NewReader([]byte(query))
-		quote, keyword bool
-		inBetween      bool
-		like           = newMatcher("like")
-		limit          = newMatcher("limit")
-		between        = newMatcher("between")
-		and            = newMatcher("and")
-	)
-	for {
-		if char, _, err := reader.ReadRune(); err == nil {
-			switch char {
-			case '\'', '`':
-				quote = !quote
-			}
-			if quote {
-				continue
-			}
-			switch {
-			case char == '?' && keyword:
-				count++
-			case char == '@':
-				if param := paramParser(reader); len(param) != 0 {
-					if _, found := args[param]; !found {
-						args[param] = struct{}{}
-						count++
-					}
-				}
-			case
-				char == '=',
-				char == '<',
-				char == '>',
-				char == '(',
-				char == ',',
-				char == '[':
-				keyword = true
-			default:
-				if limit.matchRune(char) || like.matchRune(char) {
-					keyword = true
-				} else if between.matchRune(char) {
-					keyword = true
-					inBetween = true
-				} else if inBetween && and.matchRune(char) {
-					keyword = true
-					inBetween = false
-				} else {
-					keyword = keyword && (char == ' ' || char == '\t' || char == '\n')
-				}
-			}
-		} else {
-			break
-		}
-	}
-	return count
-}
-
-func paramParser(reader *bytes.Reader) string {
-	var name bytes.Buffer
-	for {
-		if char, _, err := reader.ReadRune(); err == nil {
-			if char == '_' || char >= '0' && char <= '9' || 'a' <= char && char <= 'z' || 'A' <= char && char <= 'Z' {
-				name.WriteRune(char)
-			} else {
-				reader.UnreadRune()
-				break
-			}
-		} else {
-			break
-		}
-	}
-	return name.String()
-}
-
-var selectRe = regexp.MustCompile(`\s+SELECT\s+`)
-
-func isInsert(query string) bool {
-	if f := strings.Fields(query); len(f) > 2 {
-		return strings.EqualFold("INSERT", f[0]) && strings.EqualFold("INTO", f[1]) && !selectRe.MatchString(strings.ToUpper(query))
-	}
-	return false
-}
-
-func quote(v driver.Value) string {
-	switch v := reflect.ValueOf(v); v.Kind() {
-	case reflect.Slice:
-		values := make([]string, 0, v.Len())
-		for i := 0; i < v.Len(); i++ {
-			values = append(values, quote(v.Index(i).Interface()))
-		}
-		return strings.Join(values, ", ")
-	}
-	switch v := v.(type) {
-	case string:
-		return "'" + strings.NewReplacer(`\`, `\\`, `'`, `\'`).Replace(v) + "'"
-	case time.Time:
-		return formatTime(v)
-	}
-	return fmt.Sprint(v)
-}
-
-func formatTime(value time.Time) string {
-	if (value.Hour() + value.Minute() + value.Second() + value.Nanosecond()) == 0 {
-		return fmt.Sprintf("toDate(%d)", int(int16(value.Unix()/24/3600)))
-	}
-	return fmt.Sprintf("toDateTime(%d)", int(uint32(value.Unix())))
-}