diff --git a/工具v2/database_tools.py b/工具v2/database_tools.py
index 1e2b55d1..ea9bb758 100644
--- a/工具v2/database_tools.py
+++ b/工具v2/database_tools.py
@@ -473,5 +473,23 @@ def ModifyMetadata(prodict,objdict,fieldsdict,metadatafilepath,pendingdatafilepa
                 print("字段 %s 不可按此方式修改"%field)
     return feedback # 已在数据库中修改, 之后需要将数据库写入一次, 返回1表示字段名有误, 返回其他表示成功进行了修改
 
+def parseUsage(usagestring): #对单行usage信息进行分词
+    usagedict = {}
+    datalist = re.sub(r"\s+",r"\t",usagestring.strip()).split("\t")
+    if re.findall(r"20[\d]{2,6}",datalist[0]) != [] and re.findall(r"[\u4e00-\u9fa5]",datalist[0]) == []:
+        date = datalist.pop(0)
+    else:
+        date = ""
+    usagedict["date"] = date
+    if re.findall(r"[高一二三班]",datalist[0]) != []:
+        classid = datalist.pop(0)
+    else:
+        classid = ""
+    usagedict["classid"] = classid
+    usagedict["subproblems"] = len(datalist)
+    usagedict["difficulties"] = [float(u) for u in datalist]
+    usagedict["glossdiff"] = round(sum(usagedict["difficulties"])/usagedict["subproblems"],3)
+    return usagedict #返回词典, 含date日期, classid班级标识, subproblems小题数目, difficulties得分率, glossdiff小题平均得分率
+
 if __name__ == "__main__":
     print("数据库工具, import用.")
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