fix(cache): 修复 tableExists 方法以正确检测达梦数据库中的表存在性

- 修改 tableExists 方法，使用 COUNT(*) 查询当前 schema 下的表，避免因用户权限导致的误判
- 更新 ObjToFloat64、ObjToInt64 和 ObjToStr 方法，增加对多种整数和布尔类型的支持
- 在 Row 方法中处理 time.Time 类型，确保与 MySQL 兼容的字符串格式输出

common/objtoobj.go

@@ -214,8 +214,28 @@ func ObjToFloat64(obj interface{}, e ...*Error) float64 {
 		switch val := obj.(type) {
 		case int:
 			v = float64(val)
+		case int8:
+			v = float64(val)
+		case int16:
+			v = float64(val)
+		case int32:
+			v = float64(val)
 		case int64:
 			v = float64(val)
+		case uint:
+			v = float64(val)
+		case uint8:
+			v = float64(val)
+		case uint16:
+			v = float64(val)
+		case uint32:
+			v = float64(val)
+		case uint64:
+			v = float64(val)
+		case bool:
+			if val {
+				v = 1
+			}
 		case string:
 			value, e2 := strconv.ParseFloat(val, 64)
 			if e2 != nil {
@@ -295,8 +315,28 @@ func ObjToInt64(obj interface{}, e ...*Error) int64 {
 		switch val := obj.(type) {
 		case int:
 			v = int64(val)
+		case int8:
+			v = int64(val)
+		case int16:
+			v = int64(val)
+		case int32:
+			v = int64(val)
 		case int64:
 			v = val
+		case uint:
+			v = int64(val)
+		case uint8:
+			v = int64(val)
+		case uint16:
+			v = int64(val)
+		case uint32:
+			v = int64(val)
+		case uint64:
+			v = int64(val)
+		case bool:
+			if val {
+				v = 1
+			}
 		case string:
 			value, e2 := StrToInt(val)
 			if e2 != nil {
@@ -375,8 +415,20 @@ func ObjToStr(obj interface{}) string {
 	switch val := obj.(type) {
 	case int:
 		str = strconv.Itoa(val)
+	case int8:
+		str = strconv.Itoa(int(val))
+	case int16:
+		str = strconv.Itoa(int(val))
+	case int32:
+		str = strconv.Itoa(int(val))
 	case uint8:
 		str = strconv.Itoa(int(val))
+	case uint16:
+		str = strconv.Itoa(int(val))
+	case uint32:
+		str = strconv.FormatUint(uint64(val), 10)
+	case uint64:
+		str = strconv.FormatUint(val, 10)
 	case int64:
 		str = strconv.FormatInt(val, 10)
 	case []byte:
@@ -389,6 +441,9 @@ func ObjToStr(obj interface{}) string {
 		str = strconv.FormatFloat(float64(val), 'f', -1, 32)
 	case bool:
 		str = strconv.FormatBool(val)
+	case time.Time:
+		// DM8等数据库驱动直接返回time.Time，格式化为MySQL兼容的字符串
+		str = val.Format("2006-01-02 15:04:05")
 	default:
 		strbte, err := json.MarshalIndent(obj, "", "\t")
 		if err == nil {