c# - sql插入asp.net

Question

con.Open();
SqlCommand cmd=new SqlCommand("INSERT INTO user(Firstname,Lastname,Email,Pass,Type)
    values(@first,@last,@email,@pass,@type)",con);
cmd.Parameters.Add("@first",SqlDbType.NVarChar).Value = txtfirst.Text;
cmd.Parameters.Add("@last",SqlDbType.NVarChar).Value = txtlast.Text;
cmd.Parameters.Add("@email",SqlDbType.NVarChar).Value = txtemail.Text;
cmd.Parameters.Add("@pass",SqlDbType.NVarChar).Value = txtpass.Text;
cmd.Parameters.Add("@type",SqlDbType.NVarChar).Value = "customer";
cmd.ExecuteNonQuery();
con.Close();

我的语法有什么问题，它说“关键字‘user’附近的语法不正确。”

Answer 1

您应该使用分隔标识符转义表名 user，

SqlCommand cmd=new SqlCommand("INSERT INTO [user] (Firstname,Lastname,Email,Pass,Type) values(@first,@last,@email,@pass,@type)",con);

• SQL Server Reserved Keywords
• SQL Server Delimited Identifiers

更新 1

折射你的代码

• 使用 using 语句正确处理对象
• 使用Try-Catch block 正确处理异常

代码片段:

string _connStr = "connectionString here";
string _query = "INSERT INTO [user] (Firstname,Lastname,Email,Pass,Type) values (@first,@last,@email,@pass,@type)";
using (SqlConnection conn = new SqlConnection(_connStr))
{
    using (SqlCommand comm = new SqlCommand())
    {
        comm.Connection = conn;
        comm.CommandType = CommandType.Text;
        comm.CommandText = _query;
        comm.Parameters.AddWithValue("@first", txtfirst.Text);
        comm.Parameters.AddWithValue("@last", txtlast.Text);
        comm.Parameters.AddWithValue("@email", txtemail.Text);
        comm.Parameters.AddWithValue("@pass", txtpass.Text);
        comm.Parameters.AddWithValue("@type", "customer");
        try
        {
            conn.Open();
            comm.ExecuteNonQuery();
        }
        catch(SqlException ex)
        {
            // other codes here
            // do something with the exception
            // don't swallow it.
        }
    }
}

• AddWithValue
• Add (recommended one)