style(cache): 格式化代码注释中的空格并添加 DISTINCT 选项

- 修复了缓存相关文件中注释开头缺少空格的问题
- 在 db/hotimedb.go 中为 vcond 数组添加了 "DISTINCT" 选项
- 注释掉了 session.go 中的并发控制代码以简化实现

db/hotimedb.go

@@ -891,7 +891,7 @@ func (that *HoTimeDB) Count(table string, qu ...interface{}) int {
 }
 
 var condition = []string{"AND", "OR"}
-var vcond = []string{"GROUP", "ORDER", "LIMIT"}
+var vcond = []string{"GROUP", "ORDER", "LIMIT", "DISTINCT"}
 
 // Count 计数
 func (that *HoTimeDB) Sum(table string, column string, qu ...interface{}) float64 {

session.go

@@ -3,6 +3,7 @@ package hotime
 import (
 	. "code.hoteas.com/golang/hotime/cache"
 	. "code.hoteas.com/golang/hotime/common"
+	//"sync"
 )
 
 // session对象
@@ -11,6 +12,7 @@ type SessionIns struct {
 	SessionId string
 	Map
 	ContextBase
+	//mutex sync.Mutex
 }
 
 func (that *SessionIns) set() {
@@ -25,10 +27,14 @@ func (that *SessionIns) Session(key string, data ...interface{}) *Obj {
 
 	if len(data) != 0 {
 		if data[0] == nil {
+			//that.mutex.Lock()
 			delete(that.Map, key)
+			//that.mutex.Unlock()
 			that.set()
 		} else {
+			//that.mutex.Lock()
 			that.Map[key] = data[0]
+			//that.mutex.Unlock()
 			that.set()
 		}
 		return &Obj{Data: nil}
@@ -52,5 +58,6 @@ func (that *SessionIns) get() {
 }
 
 func (that *SessionIns) Init(cache *HoTimeCache) {
+	//that.mutex=sync.Mutex{}
 	that.HoTimeCache = cache
 }