使用参数将数据插入访问数据库 [英] Using parameters inserting data into access database

问题描述

我有以下方法将数据插入到访问数据库中

I have the following method to inserting data into an an access databasewhich works fine but I do get a problem if I try to insert text that contains single quotes I have learned.

[WebMethod]
public void bookRatedAdd(string title, int rating, string review, string ISBN, string userName)
{
    OleDbConnection conn;
    conn = new OleDbConnection(@"Provider=Microsoft.Jet.OleDb.4.0;
                                               Data Source=" + Server.MapPath("App_Data\BookRateInitial.mdb"));

    conn.Open();

    OleDbCommand cmd = conn.CreateCommand();

    cmd.CommandText = @"INSERT INTO bookRated([title], [rating],  [review], [frnISBN], [frnUserName])VALUES('" + title + "', '" + rating + "','" + review + "','" + ISBN + "', '" + userName + "')";
    cmd.ExecuteNonQuery();
    conn.Close();
}

据我了解，解决问题的方法之一是使用参数.老实说，我不确定如何做到这一点.如何更改上面的代码，以便使用参数插入数据?

From what I understand one of the ways to solve the problem is by using parameters. I am not sure how to do this to be honest. How could I change the above code so that I insert the data by using parameters instead?

推荐答案

与任何其他查询相同:

a) 替换 OleDbCommand 带占位符(以 @ 为前缀)，
b) 添加 OleDbParameter 的实例 到 DbCommand.参数 属性.参数名称必须与占位符名称匹配.

a) Replace actual hardcoded parameters in your OleDbCommand with placeholders (prefixed with @),
b) Add instances of OleDbParameter to the DbCommand.Parameters property. Parameter names must match placeholder names.

[WebMethod]
public void bookRatedAdd(string title, int rating, string review, string ISBN, string userName)
{
   using (OleDbConnection conn = new OleDbConnection(
         "Provider=Microsoft.Jet.OleDb.4.0;"+
         "Data Source="+Server.MapPath("App_Data\BookRateInitial.mdb"));
   {

      conn.Open();

      // DbCommand also implements IDisposable
      using (OleDbCommand cmd = conn.CreateCommand())
      {
           // create command with placeholders
           cmd.CommandText = 
              "INSERT INTO bookRated "+
              "([title], [rating],  [review], [frnISBN], [frnUserName]) "+
              "VALUES(@title, @rating, @review, @isbn, @username)";

           // add named parameters
           cmd.Parameters.AddRange(new OleDbParameter[]
           {
               new OleDbParameter("@title", title),
               new OleDbParameter("@rating", rating),
               ...
           });

           // execute
           cmd.ExecuteNonQuery();
      }
   }
}

这篇关于使用参数将数据插入访问数据库的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！