Question

所以我试图传入点字符串的参数，我的所有列都在我的数据库中标记为非null但是当我尝试运行下面的代码时它告诉我列Lat不能为空。我有什么东西可以忽略吗？

string latParameter = "'Point(" + latString + ")'";
            string lonParameter = "'Point(" + lonString + ")'";

            string mySQLfinishedProcessing = " insert into zipcodes " +
              "set zipcode = '" + zipcodeString + "'" +
              ",State = '" + StateString + "'" +
              ",City = '" + CityString + "'" +
              ",lat = GeomFromText(@latParam)"+
              ",lon = GeomFromText(@lonParam)"+
            ",StateCode = '" + StateCodeString2 + "'";

            //File.AppendAllText(@"C:\sqlupdater.txt", mySQLfinishedProcessing + ";\n");

            MySqlConnection configCON = new MySqlConnection(SQLStringClass.zipCONString);
            MySqlCommand CounterLogs = new MySqlCommand(mySQLfinishedProcessing, configCON);
            CounterLogs.Parameters.Add(new MySqlParameter("@latParam", latParameter));
            CounterLogs.Parameters.Add(new MySqlParameter("@lonParam", lonParameter));
            configCON.Open();
            CounterLogs.ExecuteNonQuery();
            configCON.Close();

是的，latString和lonString有值。

string latParameter ='Point（40.92233）' string lonParameter ='Point（-72.63708）'

好吧它似乎是因为只有一个点的一个引用，我改变字符串latParameter ='点（40.92233 12）'它就好了。但我真的想把我的纬度/经度放在1点列中吗？

在MySQl Edit中没有任何关系可以正常工作，但在C＃中它仍然无法解决问题。问题是字符串lonParameter需要包含一个;

这是正确的代码。

 string latParameter = "Point(" + latString + " " +lonString+");";

            string mySQLfinishedProcessing = " insert into zipcodes " +
              "set zipcode = '" + zipcodeString + "'" +
              ",State = '" + StateString + "'" +
              ",City = '" + CityString + "'" +
              ",Location = GeomFromText(@latParam)"+
            ",StateCode = '" + StateCodeString2 + "'";

            //File.AppendAllText(@"C:\sqlupdater.txt", mySQLfinishedProcessing + ";\n");

            MySqlConnection configCON = new MySqlConnection(SQLStringClass.zipCONString);
            MySqlCommand CounterLogs = new MySqlCommand(mySQLfinishedProcessing, configCON);
            CounterLogs.Parameters.Add(new MySqlParameter("@latParam", latParameter));
            configCON.Open();
            CounterLogs.ExecuteNonQuery();
            configCON.Close();

Answer 1

您正在使用错误的语法编写插入语句。它一定是

string mySQLfinishedProcessing = " insert into zipcodes(zipcode ,State ,City ,lat ,lon ,StateCode ) values ( " +
          "'" + zipcodeString + "'" +
          ",'" + StateString + "'" +
          ",'" + CityString + "'" +
          ",GeomFromText(@latParam)" +
          ",GeomFromText(@lonParam)" +
        ",'" + StateCodeString2 + "')";

Answer 2

如果GeomFromText是一个db函数，它可能会为你传入的任何内容返回null。

C＃mysql参数值是否为空？

2 个答案: