我在我的程序中遇到 MySqlException 错误。这是一个简单的测试程序,我试图将带有时间戳的日志错误插入到我的数据库中的表中。
//--------------程序------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;
string Log = "Sample Log Error";
string key = "11111";
string date;
string time;
int unixT;
TimeSpan unix_time;
// geting current date in yyyy-mm-dd format
date = DateTime.UtcNow.ToString("yyyy-MM-dd");
//getting current time in hh:mm:ss format
time = string.Format("{0:HH:mm:ss tt}", DateTime.Now);
// Getting Unix Time
unix_time = (System.DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0));
//converting Unix time to seconds
unixT = Convert.ToInt32(unix_time.TotalSeconds);
MySqlConnection myConn = new MySqlConnection("Server=172.178.2.143;" + "Port=3306;" + "Database=DB;" + "Uid=user;" + "Pwd=pass;");
try
{
myConn.Open();
}
catch (MySqlException e)
{
Console.WriteLine(e);
}
MySqlCommand comm1 = new MySqlCommand("INSERT INTO Logger(date_stamp, time_stamp, log, unix_time, key) VALUES(@date_stamp, @time_stamp, @log, @unix_time, @key)", myConnection);
//inserting each element from GPS split message into its respective table and column in the database
comm1.Parameters.AddWithValue("date_stamp", date);
comm1.Parameters.AddWithValue("time_stamp", time);
comm1.Parameters.AddWithValue("log", Log);
comm1.Parameters.AddWithValue("unix_time", unixT);
comm1.Parameters.AddWithValue("key", key);
try
{
comm1.ExecuteNonQuery(); //executing the INSERT Query Above
}
catch (MySqlException e)
{
Console.WriteLine(e);
}
myConnection.Close();
//------------结束程序----------------
我收到以下错误:
"You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'key) VALUES('2013-09-13', '16:21:15 PM', 'Sample Log Error', 1379103676, '11111'' at line 1"
最佳答案
KEY 这个词是一个 reserved keyword对于 MySql
如果您想在代码中使用该名称,则需要在其周围添加反引号
MySqlCommand comm1 = new MySqlCommand("INSERT INTO Logger(date_stamp," +
"time_stamp, log, unix_time, `key`) " +
"VALUES(@date_stamp, @time_stamp, @log, @unix_time, @key)",
myConnection);
如果在您的应用程序开发阶段还不算太晚,我建议您更改该名称,因为每次您接触该字段时,您都会遇到同样的问题需要记住。
我还想建议 using statement围绕您的代码,只需一次尝试即可
try
{
using(MySqlConnection myConn = new MySqlConnection(.....))
using(MySqlCommand comm1 = new MySqlCommand(......))
{
myConn.Open();
comm1.Parameters.AddWithValue("date_stamp", date);
.....
comm1.ExecuteNonQuery();
}
}
catch (MySqlException e)
{
Console.WriteLine(e);
}
通过这种方式,您可以正确处理边缘情况(无法打开连接,无法执行命令),并且当代码流出右大括号时,您的连接将被正确关闭和处理。
关于C# - INSERT 到 DB 的 MySQL 语法错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18794816/