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  • 带参数的Command的执行

    一个参数的执行:

    string sqlstr = "select count(*) from Users where UserName = @Username";
       //打开数据库连接
    conn.Open();
      //创建命令对象
    SqlCommand cmd = new SqlCommand(sqlstr, conn);
      //判断SqlCommand对象的ExecuteScalar方法返回的参数是否大于0,大于0说明用户已经存在
    cmd.Parameters.AddWithValue("@Username", username);

    多个参数的执行:

           //string sql = "insert into Users(UserName,UserSex,Password,Email,PassQuestion,PassAnswer) values( '" + userName + "','" + Sex + "','" + passWord + "','" + emailAddress + "','" + tishiQuesetion + "','" + tishiPassWord + "')";
            string sql ="insert into Users(UserName,UserSex,Password,Email,PassQuestion,PassAnswer) values(@username,@usersex,@password,@email,@passQuestion,@passAnswer)";
                    conn.Open();
                    SqlCommand cmd = new SqlCommand(sql, conn);
                    cmd.Parameters.AddWithValue("@username", userName);
                    cmd.Parameters.AddWithValue("@usersex", Sex);
                    cmd.Parameters.AddWithValue("@password", passWord);
                    cmd.Parameters.AddWithValue("@email", emailAddress);
                    cmd.Parameters.AddWithValue("@passQuestion", tishiQuesetion);
                    cmd.Parameters.AddWithValue("@passAnswer", tishiPassWord);
                    if (Convert.ToInt32(cmd.ExecuteNonQuery()) > 0)
                    {
                        Response.Write("<script>alert('恭喜你注册成功!')</script>");
                    }
                    else
                    {
                        Response.Write("<script>alert('注册失败!')</script>");
                    }
                    conn.Close();

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  • 原文地址:https://www.cnblogs.com/wangyhua/p/4050686.html
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