數據庫SqlParameter 的插入操作,防止sql注入的實現代碼

更新時間：2013年04月22日 15:11:29 作者：

今天學習了一下SqlParameter的用法，原來這么寫是為了防止sql注入，破壞數據庫的。并自己動手連接了數據庫。

例子：點擊Button1按鈕的時候就把數據插入數據庫中。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using System.Configuration;

namespace ParaMeter
{
    public partial class Test : System.Web.UI.Page
    {
        private string connectionStr; //鏈接數據庫的字符串
        private SqlConnection conDB;   //數據庫的鏈接
        private SqlTransaction _trans; //事務對象

        protected void Page_Load(object sender, EventArgs e)
        {
            //connectionStr = ConfigurationSettings.AppSettings["constr"];
            connectionStr = "server=10.11.43.189\\SQL2008;database=OA_WEB_DB;uid=sa;pwd=123456";
            conDB = new SqlConnection(connectionStr);
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("INSERT INTO [OA_WEB_DB].[dbo].[OA_RT_FileType]([FileTypeName],[Deleted])");
            strSql.Append("VALUES(@fileName,@delete)");
            SqlParameter[] parameters = {
                                 new SqlParameter("@fileName", SqlDbType.NVarChar,100),
                                 new SqlParameter("@delete",SqlDbType.Bit),

                             };
            parameters[0].Value = "文件類型";
            parameters[1].Value = false;
          bool IsSucc =   ExecUpdateSql(strSql.ToString(), parameters);
          if (IsSucc)
          {
             Label1.Text = "插入成功";
          }
          else
          {
              Label1.Text = "插入失敗";
          }

        }
        /// 執(zhí)行一條更新語句
        /// </summary>
        /// <param name="SQLString">需要執(zhí)行的SQL語句。</param>
        /// <param name="cmdParms">執(zhí)行參數數組</param>
        /// <returns>成功返回True，失敗返回False。</returns>
        private bool ExecUpdateSql(string SQLString, params SqlParameter[] cmdParms)
        {
            using (SqlCommand cmd = new SqlCommand())
            {
                try
                {
                    PrepareCommand(cmd, conDB, _trans, SQLString, cmdParms);
                    int iret = cmd.ExecuteNonQuery();
                    return true;
                }
                catch (System.Data.SqlClient.SqlException e)
                {
                    return false;
                }
            }
        }
        private void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText, SqlParameter[] cmdParms)
        {
            if (conn.State != ConnectionState.Open)
                conn.Open();
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            if (trans != null)
                cmd.Transaction = trans;
            cmd.CommandType = CommandType.Text;//cmdType;
            if (cmdParms != null)
            {
                foreach (SqlParameter parameter in cmdParms)
                {
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                        (parameter.Value == null))
                    {
                        parameter.Value = DBNull.Value;
                    }
                    cmd.Parameters.Add(parameter);
                }
            }
        }