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<appSettings>
??<add key="conindex" value="1"/>
??<add key="sqlconstr" value="server=.\SQLEXPRESS;database=MyOffice;uid=sa;pwd=zqmingok"/>
??<add key="OLEDBCONNECTIONSTRING" value="provider=microsoft.jet.oledb.4.0;data source="/>
??<add key="dbPath" value="~/App_Data/Data.mdb"/>
??
?</appSettings>

Code
using?System;
using?System.Data;
using?System.Data.OleDb;
using?System.Data.Sql;
using?System.Data.SqlClient;
using?System.Configuration;
using?System.Web;
using?System.Web.Security;
using?System.Web.UI;
using?System.Web.UI.WebControls;
using?System.Web.UI.WebControls.WebParts;
using?System.Web.UI.HtmlControls;


public?class?SQLHelper
{
????private?static?string?keystr?=?ConfigurationManager.AppSettings[0].ToString();
????private?int?conindex?=?Convert.ToInt32(keystr);
????private?SqlConnection?sqlcon?=?null;
????private?SqlCommand?sqlcom?=?null;
????private?SqlDataReader?sdr?=?null;
????///?<summary>
????///?初始化方法
????///?</summary>
????public?SQLHelper()
????{
????????//string?constr=ConfigurationManager.ConnectionStrings[1].ConnectionString;
????????sqlcon?=?new?SqlConnection(getConStr(1));

????}
????///?<summary>
????///?獲取數據庫連接字段
????///?</summary>
????///?<param?name="conindex">web.config中的配制字符串按順序分別為0,1,2,3.</param>
????///?<returns>返回數據庫連接字符串</returns>
????private?string?getConStr(int?Tindex)
????{
????????if?(Tindex?==?1?||?Tindex?==?2)
????????{
????????????if?(Tindex?==?1)
????????????{
????????????????string?sqlconstr?=?ConfigurationManager.AppSettings[1].ToString();
????????????????return?sqlconstr;
????????????}
????????????else
????????????{
????????????????string?oledconstr?=?ConfigurationManager.AppSettings[2].ToString();
????????????????string?oleddbstr?=?System.Web.HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings[3].ToString());
????????????????return?oledconstr?+?oleddbstr;
????????????}
????????}
????????else
????????{
????????????return?null;
????????}
????}
????///?<summary>
????///?執行增刪改操作
????///?</summary>
????///?<param?name="sql">傳入的SQL</param>
????///?<returns>返回影響的行數</returns>
????public?int?ExecuteNonQuery(string?sql)
????{
????????int?res;
????????try
????????{
????????????sqlcom?=?new?SqlCommand(sql,?getCon());
????????????res?=?sqlcom.ExecuteNonQuery();

????????}
????????catch?(Exception?ex)
????????{
????????????throw?ex;
????????}
????????finally
????????{
????????????closecon();
????????}

????????return?res;
????}
????public?int?ExecuteNonQuery(string?sql,?SqlParameter[]?paras)
????{
????????int?res;
????????try
????????{
????????????sqlcom?=?new?SqlCommand(sql,?getCon());
????????????sqlcom.Parameters.AddRange(paras);
????????????res?=?sqlcom.ExecuteNonQuery();

????????}
????????catch?(Exception?ex)
????????{
????????????throw?ex;
????????}
????????finally
????????{
????????????closecon();
????????}

????????return?res;
????}

????///?<summary>
????///?執行查詢
????///?</summary>
????///?<param?name="sql">傳入SQL</param>
????///?<returns>返回TABLE</returns>
????public?DataTable?ExecuteQuery(string?sql)
????{
????????DataTable?dt?=?new?DataTable();

????????sqlcom?=?new?SqlCommand(sql,?getCon());
????????using?(sdr?=?sqlcom.ExecuteReader(CommandBehavior.CloseConnection))
????????{?dt.Load(sdr);?}
????????closecon();
????????return?dt;
????}
????public?DataTable?ExecuteQuery(string?sql,?SqlParameter[]?paras)
????{
????????DataTable?dt?=?new?DataTable();

????????sqlcom?=?new?SqlCommand(sql,?getCon());
????????sqlcom.Parameters.AddRange(paras);
????????using?(sdr?=?sqlcom.ExecuteReader(CommandBehavior.CloseConnection))
????????{?dt.Load(sdr);?}
????????closecon();
????????return?dt;
????}
????///?<summary>
????///?datereader
????///?</summary>
????///?<param?name="sql"></param>
????///?<returns></returns>
????public?SqlDataReader?ExecuteDataReaderQuery(string?sql)
????{


????????sqlcom?=?new?SqlCommand(sql,?getCon());
????????using?(sdr?=?sqlcom.ExecuteReader(CommandBehavior.CloseConnection))
????????{?return?sdr;?}
????????closecon();

????}
????public?SqlDataReader?ExecuteDataReaderQuery(string?sql,?SqlParameter[]?paras)
????{


????????sqlcom?=?new?SqlCommand(sql,?getCon());
????????sqlcom.Parameters.AddRange(paras);
????????using?(sdr?=?sqlcom.ExecuteReader(CommandBehavior.CloseConnection))
????????{?return?sdr;?}
????????closecon();

????}

????///?<summary>
????///?執行PROCEDURE?
????///?</summary>
????///?<param?name="proc"></param>
????///?<returns></returns>
????public?DataTable?ExecuteQueryProc(string?proc)
????{
????????DataTable?dt?=?new?DataTable();

????????sqlcom?=?new?SqlCommand(proc,?getCon());
????????sqlcom.CommandType?=?CommandType.StoredProcedure;
????????//???sqlcom.Parameters.AddRange(paras);
????????using?(sdr?=?sqlcom.ExecuteReader(CommandBehavior.CloseConnection))
????????{?dt.Load(sdr);?}
????????closecon();
????????return?dt;
????}
????public?DataTable?ExecuteQueryProc(string?proc,?SqlParameter[]?paras)
????{
????????DataTable?dt?=?new?DataTable();

????????sqlcom?=?new?SqlCommand(proc,?getCon());
????????sqlcom.CommandType?=?CommandType.StoredProcedure;
????????sqlcom.Parameters.AddRange(paras);
????????using?(sdr?=?sqlcom.ExecuteReader(CommandBehavior.CloseConnection))
????????{?dt.Load(sdr);?}
????????closecon();
????????return?dt;
????}
????public?int?ExecuteNonQueryProc(string?proc)
????{
????????int?res;
????????try
????????{
????????????sqlcom?=?new?SqlCommand(proc,?getCon());
????????????sqlcom.CommandType?=?CommandType.StoredProcedure;
????????????res?=?sqlcom.ExecuteNonQuery();

????????}
????????catch?(Exception?ex)
????????{
????????????throw?ex;
????????}
????????finally
????????{
????????????closecon();
????????}

????????return?res;
????}
????public?int?ExecuteNonQueryProc(string?proc,?SqlParameter[]?paras)
????{
????????int?res;
????????try
????????{
????????????sqlcom?=?new?SqlCommand(proc,?getCon());
????????????sqlcom.CommandType?=?CommandType.StoredProcedure;
????????????sqlcom.Parameters.AddRange(paras);
????????????res?=?sqlcom.ExecuteNonQuery();

????????}
????????catch?(Exception?ex)
????????{
????????????throw?ex;
????????}
????????finally
????????{
????????????closecon();
????????}

????????return?res;
????}

????///?<summary>
????///?得到相關CONNECTION
????///?</summary>
????///?<returns></returns>
????private?SqlConnection?getCon()
????{
????????if?(sqlcon.State?==?ConnectionState.Closed)
????????{
????????????sqlcon.Open();
????????}

????????return?sqlcon;
????}

????///?<summary>
????///?關閉連接的對象
????///?</summary>
????private?void?closecon()
????{
????????if?(sqlcon.State?==?ConnectionState.Open)
????????{
????????????sqlcon.Close();
????????}


????}
}

?

轉載于:https://www.cnblogs.com/zqmingok/archive/2009/05/21/1486251.html

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