使用 C# 在 MySQL 中更新语句

我一直在为我的工作场所构建一个小型库存系统，并偶然发现了一个我似乎无法修复的错误

 private void Update(string num,string name, string quant, string location, string category, string numquery)
    {
       // "UPDATE Inventory SET Inventorynumber='"+ num +"',Inventory_Name='"+name+"', Quantity ='"+ quant+"',Location ='"+ location+"' Category ='"+ category+"' WHERE Inventorynumber ='"+ numquery +"';";
        string query = "UPDATE Inventory SET Inventorynumber='" + Convert.ToInt16(num) + "',Inventory_Name='" + name + "', Quantity ='" + quant + "',Location ='" + location + "' Category ='" + category + "' WHERE Inventorynumber ='" + Convert.ToInt16(numquery) + "'";
        if (this.OpenConnection() == true)
        {
            MySqlCommand cmd = new MySqlCommand();
            cmd.CommandText = query;
            cmd.Connection = serverconnection;
            cmd.ExecuteNonQuery();
            this.CloseConnection();
            Bind();
        }
    }

我不知道这里要改变什么。 任何帮助，将不胜感激。

Problem:你错过了comma after location查询中的参数。
解决方案：您需要将parameters用一个comma.

建议 ： Use parameterized queries避免SQL Injection Attacks.

尝试这个：

private void Update(string num,string name, string quant, string location, string category, string numquery)
    {
       // "UPDATE Inventory SET Inventorynumber='"+ num +"',Inventory_Name='"+name+"', Quantity ='"+ quant+"',Location ='"+ location+"' Category ='"+ category+"' WHERE Inventorynumber ='"+ numquery +"';";
        string query = "UPDATE Inventory SET Inventorynumber=@Inventorynumber,Inventory_Name=@Inventory_Name, Quantity =@Quantity ,Location =@Location,Category =@Category WHERE Inventorynumber =@Inventorynumber";
        if (this.OpenConnection() == true)
        {
            MySqlCommand cmd = new MySqlCommand();
            cmd.CommandText = query;
            cmd.Parameters.AddWithValue("@Inventorynumber",Convert.ToInt16(num));
            cmd.Parameters.AddWithValue("@Inventory_Name",name);
            cmd.Parameters.AddWithValue("@Quantity",quant);
            cmd.Parameters.AddWithValue("@Location",location);
            cmd.Parameters.AddWithValue("@Category",category);
            cmd.Parameters.AddWithValue("@Inventorynumber",Convert.ToInt16(numquery));
            cmd.Connection = serverconnection;
            cmd.ExecuteNonQuery();
            this.CloseConnection();
            Bind();
        }
    }