diff --git a/hikyuu_cpp/hikyuu/DataType.h b/hikyuu_cpp/hikyuu/DataType.h
index c0cb4ed7..8f08625c 100644
--- a/hikyuu_cpp/hikyuu/DataType.h
+++ b/hikyuu_cpp/hikyuu/DataType.h
@@ -21,7 +21,6 @@
 
 #include <stdio.h>
 #include <cstdint>
-#include <string_view>
 #include <iostream>
 #include <list>
 #include <cmath>
@@ -95,7 +94,6 @@ using std::uint8_t;
 typedef double price_t;
 
 using std::string;
-using std::string_view;
 
 using std::enable_shared_from_this;
 using std::make_shared;
diff --git a/hikyuu_cpp/hikyuu/GlobalInitializer.cpp b/hikyuu_cpp/hikyuu/GlobalInitializer.cpp
index 3059a8e1..15b0a975 100644
--- a/hikyuu_cpp/hikyuu/GlobalInitializer.cpp
+++ b/hikyuu_cpp/hikyuu/GlobalInitializer.cpp
@@ -43,7 +43,7 @@ void GlobalInitializer::init() {
 
     initLogger();
     DataDriverFactory::init();
-    auto& sm = StockManager::instance();
+    StockManager::instance();
 }
 
 void GlobalInitializer::clean() {
diff --git a/hikyuu_cpp/hikyuu/data_driver/base_info/mysql/MySQLBaseInfoDriver.cpp b/hikyuu_cpp/hikyuu/data_driver/base_info/mysql/MySQLBaseInfoDriver.cpp
index d8c8b270..579e0a63 100644
--- a/hikyuu_cpp/hikyuu/data_driver/base_info/mysql/MySQLBaseInfoDriver.cpp
+++ b/hikyuu_cpp/hikyuu/data_driver/base_info/mysql/MySQLBaseInfoDriver.cpp
@@ -36,10 +36,7 @@ bool MySQLBaseInfoDriver::_init() {
     connect_param.set<string>("db", getParamFromOther<string>(m_params, "db", "hku_base"));
     string port_str = getParamFromOther<string>(m_params, "port", "3306");
     unsigned int port = boost::lexical_cast<unsigned int>(port_str);
-    HKU_TRACE("MYSQL host: {}", host);
-    HKU_TRACE("MYSQL port: {}", port);
-    HKU_TRACE("MYSQL database: {}", database);
-
+    connect_param.set<int>("port", port);
     m_pool = new ConnectPool<MySQLConnect>(connect_param);
     return true;
 }
diff --git a/hikyuu_cpp/hikyuu/data_driver/kdata/hdf5/H5KDataDriver.cpp b/hikyuu_cpp/hikyuu/data_driver/kdata/hdf5/H5KDataDriver.cpp
index ef06aef5..06cb3172 100644
--- a/hikyuu_cpp/hikyuu/data_driver/kdata/hdf5/H5KDataDriver.cpp
+++ b/hikyuu_cpp/hikyuu/data_driver/kdata/hdf5/H5KDataDriver.cpp
@@ -934,7 +934,6 @@ TransList H5KDataDriver::_getTransList(const string& market, const string& code,
         return result;
     }
 
-    H5TransRecord* pBuf = NULL;
     try {
         string tablename(market + code);
         CHECK_DATASET_EXISTS_RET(group, tablename, result);
@@ -1118,7 +1117,6 @@ TransList H5KDataDriver::_getTransList(const string& market, const string& code,
         return result;
     }
 
-    H5TransRecord* pBuf = NULL;
     try {
         string tablename(market + code);
         CHECK_DATASET_EXISTS_RET(group, tablename, result);
diff --git a/hikyuu_cpp/hikyuu/data_driver/kdata/mysql/MySQLKDataDriver.cpp b/hikyuu_cpp/hikyuu/data_driver/kdata/mysql/MySQLKDataDriver.cpp
index 75dba0eb..54eaf251 100644
--- a/hikyuu_cpp/hikyuu/data_driver/kdata/mysql/MySQLKDataDriver.cpp
+++ b/hikyuu_cpp/hikyuu/data_driver/kdata/mysql/MySQLKDataDriver.cpp
@@ -29,6 +29,7 @@ bool MySQLKDataDriver::_init() {
     connect_param.set<string>("pwd", getParamFromOther<string>(m_params, "pwd", ""));
     string port_str = getParamFromOther<string>(m_params, "port", "3306");
     unsigned int port = boost::lexical_cast<unsigned int>(port_str);
+    connect_param.set<int>("port", port);
     m_pool = new ConnectPool<MySQLConnect>(connect_param);
     return true;
 }
@@ -37,7 +38,7 @@ string MySQLKDataDriver ::_getTableName(const string& market, const string& code
                                         KQuery::KType ktype) {
     string table = fmt::format("`{}`_`{}`.`{}`", market, KQuery::getKTypeName(ktype), code);
     to_lower(table);
-    return std::move(table);
+    return table;
 }
 
 KRecordList MySQLKDataDriver::getKRecordList(const string& market, const string& code,
diff --git a/hikyuu_cpp/hikyuu/trade_sys/allocatefunds/AllocateFundsBase.cpp b/hikyuu_cpp/hikyuu/trade_sys/allocatefunds/AllocateFundsBase.cpp
index c82a9486..1896f46d 100644
--- a/hikyuu_cpp/hikyuu/trade_sys/allocatefunds/AllocateFundsBase.cpp
+++ b/hikyuu_cpp/hikyuu/trade_sys/allocatefunds/AllocateFundsBase.cpp
@@ -111,7 +111,6 @@ price_t AllocateFundsBase::_getTotalFunds(const std::list<SYSPtr>& running_list)
     }
 
     // 加上当前总账户现金余额
-    int precision = m_shadow_tm->getParam<int>("precision");
     total_value =
       roundDown(total_value + m_shadow_tm->currentCash(), m_shadow_tm->getParam<int>("precision"));
     return total_value;
diff --git a/hikyuu_cpp/hikyuu/utilities/Null.h b/hikyuu_cpp/hikyuu/utilities/Null.h
index 5d18a335..7b63d859 100644
--- a/hikyuu_cpp/hikyuu/utilities/Null.h
+++ b/hikyuu_cpp/hikyuu/utilities/Null.h
@@ -69,6 +69,20 @@ public:
     }
 };
 
+#if !defined(_MSC_VER)
+/**
+ * int64_t Null值
+ */
+template <>
+class Null<int64_t> {
+public:
+    Null() {}
+    operator int64_t() {
+        return (std::numeric_limits<int64_t>::max)();
+    }
+};
+#endif
+
 /**
  * 提供unsigned long long（无符号64位整型）的Null值
  */
diff --git a/hikyuu_cpp/hikyuu/utilities/db_connect/mysql/MySQLConnect.cpp b/hikyuu_cpp/hikyuu/utilities/db_connect/mysql/MySQLConnect.cpp
index 5c1ca5f8..945dfbb8 100755
--- a/hikyuu_cpp/hikyuu/utilities/db_connect/mysql/MySQLConnect.cpp
+++ b/hikyuu_cpp/hikyuu/utilities/db_connect/mysql/MySQLConnect.cpp
@@ -95,8 +95,10 @@ void MySQLConnect::exec(const string& sql_string) {
             mysql_free_result(result);
         } else {
             if (mysql_field_count(m_mysql) == 0) {
+#if defined(_DEBUG) || defined(DEBUG)
                 auto num_rows = mysql_affected_rows(m_mysql);
                 HKU_TRACE("num_rows: {}", num_rows);
+#endif
             } else {
                 HKU_THROW("mysql_field_count error：{}! error code：{}, error msg: {}", sql_string,
                           ret, mysql_error(m_mysql));
diff --git a/hikyuu_cpp/hikyuu/xmake.lua b/hikyuu_cpp/hikyuu/xmake.lua
index 94968a3e..40a67b2a 100644
--- a/hikyuu_cpp/hikyuu/xmake.lua
+++ b/hikyuu_cpp/hikyuu/xmake.lua
@@ -44,7 +44,9 @@ target("hikyuu")
         add_includedirs("/usr/include/hdf5")
         add_includedirs("/usr/include/hdf5/serial")
         if is_arch("x86_64")  then
-            add_linkdirs("/usr/lib64/mysql")
+            if os.exists("/usr/lib64/mysql") then
+                add_linkdirs("/usr/lib64/mysql")
+            end
             add_linkdirs("/usr/lib/x86_64-linux-gnu")
             add_linkdirs("/usr/lib/x86_64-linux-gnu/hdf5/serial")
         end
diff --git a/hikyuu_pywrap/main.cpp b/hikyuu_pywrap/main.cpp
index 743bb427..5ef19fc9 100644
--- a/hikyuu_pywrap/main.cpp
+++ b/hikyuu_pywrap/main.cpp
@@ -136,7 +136,6 @@ BOOST_PYTHON_MODULE(core) {
     :return: 对应的证券实例，如果实例不存在，则返回空实例，即Stock()，不抛出异常
     :rtype: Stock)");
 
-    int64_t null_int = Null<int64_t>();
     py::def(
       "get_kdata", Py_GetKData,
       (py::arg("market_code"), py::arg("start") = py::long_(0), py::arg("end") = py::object(),