update Put & delete method to support secondary index

db/db_impl.cc

@@ -1235,10 +1235,67 @@ void DBImpl::ReleaseSnapshot(const Snapshot* snapshot) {
 
 // Convenience methods
 Status DBImpl::Put(const WriteOptions& o, const Slice& key, const Slice& val) {
+  //ToDo
+  Status s;
+  // 遍历fieldWithIndex_，检查是否需要更新索引
+    for (const auto& field : fieldWithIndex_) {
+        // 提取字段值
+        size_t field_pos = val.ToString().find(field + ":");
+        if (field_pos != std::string::npos) {
+            size_t value_start = field_pos + field.size() + 1; // 跳过 "fieldName:"
+            size_t value_end = val.ToString().find("|", value_start); // 查找下一个分隔符
+            if (value_end == std::string::npos) {
+                value_end = val.ToString().size();
+            }
+
+            std::string fieldValue = val.ToString().substr(value_start, value_end - value_start);
+            
+            if (!fieldValue.empty()) {
+                // 构建索引键 (例如：fieldValue -> key)
+                std::string indexKey = field + ":" + fieldValue;
+                std::string indexValue = key.ToString();
+                
+                // 在indexDb_中插入二级索引
+                s = indexDb_->Put(o, Slice(indexKey), Slice(indexValue));
+                if (!s.ok()) {
+                    return s;
+                }
+            }
+        }
+    }
+  //ToDo end
   return DB::Put(o, key, val);
 }
 
 Status DBImpl::Delete(const WriteOptions& options, const Slice& key) {
+  //ToDo
+  Status s;
+  // 遍历fieldWithIndex_，检查是否需要删除索引
+    for (const auto& field : fieldWithIndex_) {
+        // 假设key是包含字段的格式，提取字段值
+        size_t field_pos = key.ToString().find(field + ":");
+        if (field_pos != std::string::npos) {
+            size_t value_start = field_pos + field.size() + 1;
+            size_t value_end = key.ToString().find("|", value_start);
+            if (value_end == std::string::npos) {
+                value_end = key.ToString().size();
+            }
+
+            std::string fieldValue = key.ToString().substr(value_start, value_end - value_start);
+            
+            if (!fieldValue.empty()) {
+                // 构建索引键 (例如：fieldValue -> key)
+                std::string indexKey = field + ":" + fieldValue;
+                
+                // 从indexDb_中删除二级索引
+                s = indexDb_->Delete(options, Slice(indexKey));
+                if (!s.ok()) {
+                    return s;
+                }
+            }
+        }
+    }
+  //ToDo end
   return DB::Delete(options, key);
 }