diff --git a/README.md b/README.md
index 62bec3d3..80f3db7a 100644
--- a/README.md
+++ b/README.md
@@ -263,7 +263,13 @@ postgres.create_datatable<person>(key1, not_null);
 sqlite.create_datatable<person>(key1);
 ```
 
-注意：目前只支持了key和not null属性，并且只支持单键，还不支持组合键，将在下一个版本中支持组合键。
+注意：目前只支持了key、unique和not null属性，并且只支持单键，还不支持组合键，将在下一个版本中支持组合键。
+```
+mysql.create_datatable<person>(ormpp_unique{"name"});
+当在mysql中使用由unique声明的std::string成员创建表时，
+由于"BLOB/TEXT column 'NAME' used in key specification without a key length", 
+故在创建表时，如果是由unique声明的std::string成员对应的数据类型则为VARCHAR(512)，否则则为TEXT
+```
 
 返回值：bool，成功返回true，失败返回false.
 
diff --git a/include/mysql.hpp b/include/mysql.hpp
index 89531b84..837f6ab2 100644
--- a/include/mysql.hpp
+++ b/include/mysql.hpp
@@ -606,7 +606,12 @@ class mysql {
             }
             else if constexpr (std::is_same_v<decltype(item), ormpp_unique>) {
               if (!has_add_field) {
-                append(sql, field_name.data(), " ", type_name_arr[i]);
+                if (type_name_arr[i] == "TEXT") {
+                  append(sql, field_name.data(), " ", "varchar(512)");
+                }
+                else {
+                  append(sql, field_name.data(), " ", type_name_arr[i]);
+                }
               }
 
               append(sql, ", UNIQUE(", item.fields, ")");
diff --git a/include/sqlite.hpp b/include/sqlite.hpp
index caef44c1..62bdcb53 100644
--- a/include/sqlite.hpp
+++ b/include/sqlite.hpp
@@ -18,7 +18,7 @@ class sqlite {
 
   void set_last_error(std::string last_error) {
     last_error_ = std::move(last_error);
-    // std::cout << last_error_ << std::endl;//todo, write to log file
+    std::cout << last_error_ << std::endl;  // todo, write to log file
   }
 
   std::string get_last_error() const { return last_error_; }
@@ -282,13 +282,14 @@ class sqlite {
 
     auto tp = sort_tuple(std::make_tuple(std::forward<Args>(args)...));
     const size_t arr_size = arr.size();
+    std::string unique_field;
     for (size_t i = 0; i < arr_size; ++i) {
       auto field_name = arr[i];
       bool has_add_field = false;
       for_each0(
           tp,
-          [&sql, &i, &has_add_field, field_name, type_name_arr, name,
-           this](auto item) {
+          [&sql, &i, &has_add_field, &unique_field, field_name, type_name_arr,
+           name, this](auto item) {
             if constexpr (std::is_same_v<decltype(item), ormpp_not_null>) {
               if (item.fields.find(field_name.data()) == item.fields.end())
                 return;
@@ -326,7 +327,7 @@ class sqlite {
                 append(sql, field_name.data(), " ", type_name_arr[i]);
               }
 
-              append(sql, ", UNIQUE(", item.fields, ")");
+              append(unique_field, ", UNIQUE(", item.fields, ")");
               has_add_field = true;
             }
             else {
@@ -343,6 +344,10 @@ class sqlite {
         sql += ", ";
     }
 
+    if (!unique_field.empty()) {
+      append(sql, unique_field.data());
+    }
+
     sql += ")";
 
     return sql;
diff --git a/tests/test_ormpp.cpp b/tests/test_ormpp.cpp
index b5a2f747..e7025ee5 100644
--- a/tests/test_ormpp.cpp
+++ b/tests/test_ormpp.cpp
@@ -950,4 +950,23 @@ TEST_CASE("orm_mysql_blob_tuple") {
   REQUIRE(img.bin.size() == size);
   REQUIRE(time == img_ex.time);
 }
-#endif
\ No newline at end of file
+#endif
+
+TEST_CASE("test create table with unique") {
+#ifdef ORMPP_ENABLE_MYSQL
+  dbng<mysql> mysql;
+  if (mysql.connect(ip, "root", password, db)) {
+    mysql.execute("drop table if exists person");
+    CHECK(mysql.create_datatable<person>(ormpp_auto_key{"id"},
+                                         ormpp_unique{"name"}));
+  }
+#endif
+#ifdef ORMPP_ENABLE_SQLITE3
+  dbng<sqlite> sqlite;
+  if (sqlite.connect(db)) {
+    sqlite.execute("drop table if exists person");
+    CHECK(sqlite.create_datatable<person>(ormpp_auto_key{"id"},
+                                          ormpp_unique{"name"}));
+  }
+#endif
+}
\ No newline at end of file