C# - 将 JSON 存储到 MySQL 数据库中 [重复]

Posted 2023-02-24

【中文标题】C# - 将 JSON 存储到 MySQL 数据库中 [重复]

【英文标题】：C# - Storing JSON into MySQL Database [duplicate]

【发布时间】：2021-05-17 07:34:21

【问题描述】：

我正在使用 ASP NET

好的，所以我有这个 JSON，我通过 JSON.stringify 字符串化它看起来像这样：

"mean":[296,28.166036637951827,1003],"mode":[305,28.3565417425884,1007],"min":[117,20.5116820888701,991],"max":[322,29.7130352284327,1014],"range":[205,9.201353139562602,23],"variance":[2041.708,3.56,45.257],"std":[45.185,1.887,6.727],"allReadings":[["289","28.2724154175823","1003","2021-02-13T20:04:46.000Z"],["305","28.2724154175823","1014","2021-02-13T20:04:56.000Z"],["294","28.2724154175823","991","2021-02-13T20:05:06.000Z"],["304","28.3565417425884","1007","2021-02-13T20:05:16.000Z"],["305","28.3565417425884","996","2021-02-13T20:05:26.000Z"],["309","28.3565417425884","995","2021-02-13T20:05:37.000Z"],["322","28.3565417425884","1012","2021-02-13T20:05:47.000Z"],["301","28.3565417425884","995","2021-02-13T20:05:57.000Z"],["307","28.3565417425884","1007","2021-02-13T20:06:07.000Z"],["117","28.5250147637195","999","2021-02-13T20:06:17.000Z"],["273","20.5116820888701","1003","2021-02-13T20:06:28.000Z"],["314","28.8628633488818","1007","2021-02-13T20:06:38.000Z"],["296","28.7782864935014","1011","2021-02-13T20:06:48.000Z"],["320","28.6937866171596","1007","2021-02-13T20:06:58.000Z"],["319","28.6093629596379","1005","2021-02-13T20:07:08.000Z"],["307","29.7130352284327","1010","2021-02-13T20:07:19.000Z"],["312","28.947517946563","1007","2021-02-13T20:07:29.000Z"],["321","28.8628633488818","994","2021-02-13T20:07:39.000Z"],["318","28.6937866171596","1005","2021-02-13T20:07:49.000Z"]]

我正在尝试使用此 C# 代码将其保存到 mysql 数据库中：

report = JSON

dt = DateTime.Now.ToString()

public static void saveReport(string report, string dt)
        
            string sql = $"INSERT INTO reports (report, date), VALUES ('report', 'dt')";
            MySqlConnection con = new MySqlConnection(smartseed_con);
            con.Open();
            MySqlCommand cmd = new MySqlCommand(sql, con);
            cmd.ExecuteNonQuery();
            con.Close();
        

但是，它抛出了这个错误。

这就是我的桌子的设计方式

我急需一些帮助 :( 有人可以提出解决方案或更好的方法吗？我什至尝试在 C# 中执行 .Replace('"', '*')，但这是行不通的。目标是将那个 " 字符替换为另一个字符这不会导致这个问题。：/

【问题讨论】：

使用参数cmd.Parameters.Add(...并使用using处理你的连接和命令对象

【参考方案1】：

使用SqlParameter 存储值。 sql 参数中的值将被视为值，不会被“解析”为查询的一部分。

using (var connection = new MySqlConnection("connectionString"))
using (var command = connection.CreateCommand())

   var sql = $"INSERT INTO reports (report, date), VALUES (@report, @dt)";
   var parameters = new[]
   
     new MySqlParameter  ParameterName = "@report", MySqlDbType = MySqlDbType.Varchar, Value = report ,
     new MySqlParameter  ParameterName = "@dt", MySqlDbType = MySqlDbType.Varchar, Value = dt ,
   ;

   command.CommandText = sql;
   command.Parameters.AddRange(parameters);

   connection.Open();
   command.ExecuteNonQuery();

注意： 不要将日期存储为 VARCHAR，MySql 支持 Date 和 Time 类型。

【讨论】：

MySqlParameter 你可以只做两次.Add 或者使用集合初始化器，它更简单

法比奥，什么是 SqlType？我需要Using 某个图书馆吗？

@Denise，这是MySqlDbType，您不需要添加任何其他库。