Queryable.Union 方法實現json格式的字符串合併

1.在數據庫中以json字符串格式保存，如：[{"name":"張三","time":"8.592","area":"27.27033","conc":"4.12136"},{"name":"李四","time":"9.100","area":"56.21229","conc":"4.57692"}]

 

2.添加新內容後合併不相同的數據。若是name相同，以最新的數據替換原來的數據。

如：數據庫中原保存的數據是[{"name":"張三","time":"8.592","area":"27.27033","conc":"4.12136"},{"name":"李四","time":"9.100","area":"56.21229","conc":"4.57692"}]

新加的數據爲[{"name":"張三","time":"12","area":"27.70533","conc":"4.12136"},{"name":"王五","time":"4","area":"77","conc":"8.788"}]

 則替換後的數據爲[{"name":"張三","time":"12","area":"27.70533","conc":"4.12136"},{"name":"王五","time":"4","area":"77","conc":"8.788"},{"name":"李四","time":"9.100","area":"56.21229","conc":"4.57692"}]

代碼以下：

 

 

 1         public void InsertOrUpdateOnlyItem(List<tblLims_Ana_LE_Import_Common> listLe)
 2         {
 3             var listLeInsert = new List<tblLims_Ana_LE_Import_Common>();
 4             var listLeUpdate = new List<tblLims_Ana_LE_Import_Common>();
 5             foreach (var le in listLe)
 6             {
 7                 tblLims_Ana_LE_Import_Common model = le;
 8                 var own = CurrentRepository.Find(a => a.fldTaskID == model.fldTaskID
 9                 && a.fldBizCatID == model.fldBizCatID
10                 && a.fldItemCode == model.fldItemCode
11                 && a.fldNumber == model.fldNumber
12                 && a.fldSampleCode == model.fldSampleCode);
13                 if (own != null)
14                 {
15                     var ser = new JavaScriptSerializer();
16 
17                     var listown = ser.Deserialize<List<Dictionary<string, string>>>(own.fldImportData);  //原數據
18                     var listmodel = ser.Deserialize<List<Dictionary<string, string>>>(model.fldImportData); //新數據
19                     IEqualityComparer<Dictionary<string, string>> ec = new EntityComparer();   //自定義的比較類
20                     own.fldImportData = ser.Serialize(listmodel.Union(listown, ec));  //合併數據
21 
22 
23                     listLeUpdate.Add(own);
24                 }
25                 else
26                 {
27                     listLeInsert.Add(model);
28                 }
29             }
30             CurrentRepository.UpdateAll(listLeUpdate);
31             CurrentRepository.InsertAll(listLeInsert);
32             CurrentRepository.Save();
33         }

View Code

tblLims_Ana_LE_Import_Common 爲數據庫中存數據的表

Union() 方法中用到的自定義比較類:

 1     /// <summary> 
 2     /// 自定義比較類 
 3     /// </summary> 
 4     public class EntityComparer : IEqualityComparer<Dictionary<string, string>>
 5     {
 6         public bool Equals(Dictionary<string, string> x, Dictionary<string, string> y)
 7         {
 8             if (ReferenceEquals(x, y)) return true;
 9 
10             if (ReferenceEquals(x, null) || ReferenceEquals(y, null))
11                 return false;
12 
13             return x["name"] == y["name"];  //若是名稱相同就不追加
14         }
15 
16         public int GetHashCode(Dictionary<string, string> obj)
17         {
18             if (ReferenceEquals(obj, null)) return 0;
19             int hashName = obj["name"] == null ? 0 : obj["name"].GetHashCode();
20             int hashCode = obj["name"] == null ? 0 : obj["name"].GetHashCode();
21             return hashName ^ hashCode;
22         }
23     }

View Code