func：添加key字段重复检测。

src/xml_opr.cpp

@@ -21,6 +21,14 @@ bool CXmlOpr::parse_xml(std::vector<tinyxml2::XMLElement*>& vec)
 {
     std::string next_node{};
     std::string node_path = opr_base_.node_path;
+    keys_.clear();
+    auto keys = splitString(opr_base_.purpose, ",");
+    for (const auto& item : keys) {
+        if (item.empty()) {
+            continue;
+        }
+        keys_.push_back(item);
+    }
 
     auto nodes = splitString(opr_base_.node_path, "/");
     for (const auto& item : nodes) {
@@ -71,6 +79,22 @@ void CXmlOpr::del_element(Element_t* ele)
     parent_node_->DeleteChild(ele);
 }
 
+bool CXmlOpr::check_key_exists(const Property_t& property)
+{
+    if (keys_.size() < 1 || property.size() < 1) {
+        return false;
+    }
+    Element_t* purpose_node = parent_node_->FirstChildElement(opr_base_.the_node.c_str());
+    while (purpose_node) {
+        const char* value = purpose_node->Attribute(keys_[0].c_str());
+        if (property[0].value == std::string(value)) {
+            return true;
+        }
+        purpose_node = purpose_node->NextSiblingElement();
+    }
+    return false;
+}
+
 bool CXmlOpr::save()
 {
     auto ret = doc_.SaveFile(xml_path_.c_str());