详解ASP.NET中连接数据库配置方法

 <connectionStrings>   <add name="Conn" connectionString="server=.;database=demo;uid=sa;pwd=123456" providerName="System.Data.SqlClient"/>   </connectionStrings>

 <connectionStrings>   <add name="Conn" connectionString="Provider=Microsoft.Jet.OLEDB.4.0; Data Source={0}App_Data/demo.mdb" providerName="System.Data.OleDb"/>   </connectionStrings>

 <connectionStrings>   <add name="Conn" connectionString="Provider=Microsoft.Jet.OLEDB.4.0; Data Source={0}App_Data/demo.mdb" providerName="System.Data.OleDb"/>   </connectionStrings>

 <connectionStrings>   <add name="Conn" connectionString="Provider=MSDAORA;Data Source=demo;User ID=sa;Password=123456;" providerName="System.Data.OracleClient"/>   </connectionStrings>

 <connectionStrings>   <add name="Conn" connectionString="Data Source={0}App_Data/demo.db;failifmissing=false" providerName="System.Data.SQLite"/>   </connectionStrings>

 <connectionStrings>   <add name="Conn" connectionString="host=127.0.0.1;Port=3306;Database=mysql;uid=sa;pwd=12346" providerName="MySql.Data.MySqlClient"/>   </connectionStrings>

二、json数据转换

using System;  using System.Collections.Generic;  using System.Data;  using System.Linq;  using System.Reflection;  using System.Text;  using System.Web;  using System.Web.Script.Serialization;    namespace Role.DAL  {   public class Json   {    public Json() { }      /// <summary>    ///将datatable数据转换成JSON数据, 字符串拼接写成的    /// </summary>    /// <param name="jsonName">json名称。没发现什么作用</param>    /// <param name="dt">得到的数据表</param>    /// <returns></returns>    public string DataTableToJson(string jsonName, DataTable dt)    {     StringBuilder Json = new StringBuilder();     Json.Append("[");     if (dt.Rows.Count > 0)     {      for (int i = 0; i < dt.Rows.Count; i++)      {       Json.Append("{");       for (int j = 0; j < dt.Columns.Count; j++)       {        Json.Append(dt.Columns[j].ColumnName.ToString() + ":\"" + dt.Rows[i][j].ToString() + "\"");        if (j < dt.Columns.Count - 1)        {         Json.Append(",");        }       }       Json.Append("}");       if (i < dt.Rows.Count - 1)       {        Json.Append(",");       }      }     }     Json.Append("]");     return Json.ToString();    }        /// <summary>    /// 列表数据转换到json数据;字符串拼接写成的，太难    /// </summary>    /// <typeparam name="T"></typeparam>    /// <param name="jsonName">json名称。没发现什么作用</param>    /// <param name="IL"></param>    /// <returns></returns>    public string ObjectToJson<T>(string jsonName, IList<T> IL)    {     StringBuilder Json = new StringBuilder();     Json.Append("[");     if (IL.Count > 0)     {      for (int i = 0; i < IL.Count; i++)      {       T obj = Activator.CreateInstance<T>();       Type type = obj.GetType();       PropertyInfo[] pis = type.GetProperties();       Json.Append("{");       for (int j = 0; j < pis.Length; j++)       {        Json.Append(pis[j].Name.ToString() + ":\"" + pis[j].GetValue(IL[i], null) + "\"");        if (j < pis.Length - 1)        {         Json.Append(",");        }       }       Json.Append("}");       if (i < IL.Count - 1)       {        Json.Append(",");       }      }     }     Json.Append("]");     return Json.ToString();    }      /// <summary>    /// 将DataTable转化为自定义JSON数据    /// </summary>    /// <param name="dt">数据表</param>    /// <returns>JSON字符串</returns>     public static string DataTableToJson(DataTable dt)    {     StringBuilder JsonString = new StringBuilder();     if (dt != null && dt.Rows.Count > 0)     {      List<Dictionary<string, string>> list = new List<Dictionary<string, string>>();      for (int i = 0; i < dt.Rows.Count; i++)      {       Dictionary<string, string> dict = new Dictionary<string, string>();       for (int j = 0; j < dt.Columns.Count; j++)       {        dict.Add(dt.Columns[j].ColumnName, dt.Rows[i][j].ToString());       }       list.Add(dict);      }      JavaScriptSerializer jsonSerializer = new JavaScriptSerializer();      return jsonSerializer.Serialize(list);     }     else     {      return "{}";     }    }      /// <summary>    /// 将datatable转换为json     /// </summary>    /// <param name="dtb">Dt</param>    /// <returns>JSON字符串</returns>    public static string Dtb2Json(DataTable dtb)    {     JavaScriptSerializer jss = new JavaScriptSerializer();     System.Collections.ArrayList dic = new System.Collections.ArrayList();     if (dtb != null && dtb.Rows.Count > 0)     {      foreach (DataRow dr in dtb.Rows)      {       System.Collections.Generic.Dictionary<string, object> drow = new System.Collections.Generic.Dictionary<string, object>();       foreach (DataColumn dc in dtb.Columns)       {        drow.Add(dc.ColumnName, dr[dc.ColumnName]);       }       dic.Add(drow);      }      //序列化       return jss.Serialize(dic);     }     else     {      return "{}";     }    }     }  }

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