- Improving the performance of sanitize sql string for key ⚡

- Fix bug in stmt exec args 🐛
- Fix doc for encode 💡

caches/encode.go

@@ -13,7 +13,7 @@ import (
 	"io"
 )
 
-// md5 hash string
+// Md5 hash string
 func Md5(str string) string {
 	m := md5.New()
 	io.WriteString(m, str)

session_stmt_cache.go

@@ -1,21 +1,20 @@
 package xorm
 
 import (
-	"regexp"
+	"strings"
 	"sync"
 
 	"github.com/cespare/xxhash"
 	"github.com/fairyhunter13/xorm/core"
 )
 
 var (
-	stmtCache                = make(map[uint64]*core.Stmt, 0) //key: xxhash of sqlstring+len(sqlstring)
-	mutex                    = new(sync.RWMutex)
-	regexWhiteSpaceCharacter = regexp.MustCompile(`[\s]`)
+	stmtCache = make(map[uint64]*core.Stmt, 0) //key: xxhash of sanitized sqlstring
+	mutex     = new(sync.RWMutex)
 )
 
 func getKey(sqlStr string) string {
-	return regexWhiteSpaceCharacter.ReplaceAllString(sqlStr, "")
+	return strings.Join(strings.Fields(sqlStr), "")
 }
 
 func (session *Session) doPrepare(db *core.DB, sqlStr string) (stmt *core.Stmt, err error) {