您现在的位置是：网站首页> 编程资料编程资料

Queryable.Union 方法实现json格式的字符串合并的具体实例_实用技巧_

2023-05-25 317人已围观

简介 Queryable.Union 方法实现json格式的字符串合并的具体实例_实用技巧_

1.在数据库中以json字符串格式保存，如：[{"name":"张三","time":"8.592","area":"27.27033","conc":"4.12136"},{"name":"李四","time":"9.100","area":"56.21229","conc":"4.57692"}]

2.添加新内容后合并不相同的数据。如果name相同，以最新的数据替换原来的数据。

如：数据库中原保存的数据是[{"name":"张三","time":"8.592","area":"27.27033","conc":"4.12136"},{"name":"李四","time":"9.100","area":"56.21229","conc":"4.57692"}]

新加的数据为[{"name":"张三","time":"12","area":"27.70533","conc":"4.12136"},{"name":"王五","time":"4","area":"77","conc":"8.788"}]

则替换后的数据为[{"name":"张三","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"}]

代码如下：

复制代码代码如下:

public void InsertOrUpdateOnlyItem(List listLe)
        {
            var listLeInsert = new List();
            var listLeUpdate = new List();
            foreach (var le in listLe)
            {
                tblLims_Ana_LE_Import_Common model = le;
                var own = CurrentRepository.Find(a => a.fldTaskID == model.fldTaskID
                && a.fldBizCatID == model.fldBizCatID
                && a.fldItemCode == model.fldItemCode
                && a.fldNumber == model.fldNumber
                && a.fldSampleCode == model.fldSampleCode);
                if (own != null)
                {
                    var ser = new JavaScriptSerializer();

                    var listown = ser.Deserialize>>(own.fldImportData); //原数据
                    var listmodel = ser.Deserialize>>(model.fldImportData); //新数据
                    IEqualityComparer> ec = new EntityComparer();   //自定义的比较类
                    own.fldImportData = ser.Serialize(listmodel.Union(listown, ec)); //合并数据

                    listLeUpdate.Add(own);
                }
                else
                {
                    listLeInsert.Add(model);
                }
            }
            CurrentRepository.UpdateAll(listLeUpdate);
            CurrentRepository.InsertAll(listLeInsert);
            CurrentRepository.Save();
        }

tblLims_Ana_LE_Import_Common 为数据库中存数据的表

Union() 方法中用到的自定义比较类:

复制代码代码如下:

///

/// 自定义比较类
///

    public class EntityComparer : IEqualityComparer>
    {
        public bool Equals(Dictionary x, Dictionary y)
        {
            if (ReferenceEquals(x, y)) return true;

if (ReferenceEquals(x, null) || ReferenceEquals(y, null))
return false;

return x["name"] == y["name"]; //如果名称相同就不追加
}

        public int GetHashCode(Dictionary obj)
        {
            if (ReferenceEquals(obj, null)) return 0;
            int hashName = obj["name"] == null ? 0 : obj["name"].GetHashCode();
            int hashCode = obj["name"] == null ? 0 : obj["name"].GetHashCode();
            return hashName ^ hashCode;
        }
    }

您可能感兴趣的文章:

上一篇：Json返回时间的格式中出现乱码问题的两种解决方案_实用技巧_

下一篇：silverlight用webclient大文件上传的实例代码_实用技巧_

您现在的位置是：网站首页> 编程资料编程资料

Queryable.Union 方法实现json格式的字符串合并的具体实例_实用技巧_

相关内容

点击排行

本栏推荐

猜你喜欢