将整数和字符串插入SQL Server数据库c#的问题

Question

我无法将整数值[Question Type]和字符串[Question Space]同时插入到我的数据库中同一行.每当我点击按钮并尝试执行错误时,会说:

System.Data.dll中发生了类型为"System.Data.SqlClient.SqlException"的未处理异常

附加信息:'('附近的语法不正确.

码:

SqlCommand command5 = new SqlCommand("INSERT INTO ([Question Space], [Question Type]) Questions VALUES ('@QuestionText', '@checkedradiobutton')", connect);
command5.Parameters.AddWithValue("@QuestionText", QuestionText);
command5.Parameters.AddWithValue("@checkedradiobutton", checkedradiobutton);

command5.ExecuteNonQuery();

我很感激任何人都能给我的帮助.

如果你想看到,这是按钮的整个代码:

private void button1_Click(object sender, EventArgs e)
{
    string connectionString = ConfigurationManager.ConnectionStrings["myconnectionstring"].ConnectionString;

    SqlConnection connect = new SqlConnection(connectionString);
    connect.Open();

    int checkedradiobutton = 0;

    if(radioButton1.Checked)
    {
        checkedradiobutton = 1;
    }
    else if(radioButton2.Checked)
    {
        checkedradiobutton = 2;
    }
    else if(radioButton3.Checked)
    {
        checkedradiobutton = 3;
    }

    string QuestionText = QuestionBox.Text;

    SqlCommand command5 = new SqlCommand("INSERT INTO ([Question Space], [Question Type]) Questions VALUES ('@QuestionText', '@checkedradiobutton')", connect);
    command5.Parameters.AddWithValue("@QuestionText", QuestionText);
    command5.Parameters.AddWithValue("@checkedradiobutton", checkedradiobutton);

    command5.ExecuteNonQuery();
}

和我的数据库表:

CREATE TABLE [dbo].[Questions] 
(
     [QuestionID]     INT           IDENTITY (1, 1) NOT NULL,
     [Actual answer]  NVARCHAR (50) NULL,
     [Question Space] NVARCHAR (50) NULL,
     [Question Type]  INT           NULL,

     PRIMARY KEY CLUSTERED ([QuestionID] ASC)
);

Answer 1

INSERT INTO的正确语法是

INSERT INTO <table> (field1, field2, fieldN) VALUES (value1, value2, valueN)

所以你的命令应该写成

SqlCommand command5 = new SqlCommand(@"INSERT INTO Questions  
                        ([Question Space], [Question Type]) VALUES  
                        (@QuestionText, @checkedradiobutton)", connect);

请注意参数占位符不应该用单引号括起来,因为这样做可以在文本文本中转换它们.("@QuestionText"在[Question Space]字段中插入字符串)

最后,尽量避免AddWithValue,它是一个有许多缺点的快捷方式,因为你可以阅读我们是否已经停止使用AddWithValue和数据访问代码如何影响数据库性能

这仍然是一行代码

 command5.Parameters.Add("@QuestionText", SqlDbType.NVarChar).Value = QuestionText;