Detailed description of the connection database configuration method in ASP.

This article mainly introduces the method of configuration of various connection databases in ASP, introduces the MSSQL, Access, Oracle, SQLite, MySQL database configuration, has certain reference value, has the interest to understand.

One, database connection statement

1. MSSQL Database Link Example

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

2. Example of Access 2003 database link: "{0}" represents the root directory

<connectionStrings> <add name= "Conn" connectionstring= "provider=microsoft.jet.oledb.4.0; Data source={0}app_data/demo.mdb "providername=" System.Data.OleDb "/> </connectionStrings>

Links to Access 2007 or later

<connectionStrings> <add name= "Conn" connectionstring= "provider=microsoft.jet.oledb.4.0; Data source={0}app_data/demo.mdb "providername=" System.Data.OleDb "/> </connectionStrings>

3. Examples of Oracle database links

<connectionStrings> <add name= "Conn" connectionstring= "Provider=msdaora;data Source=demo; User Id=sa; password=123456, "providername=" System.Data.OracleClient "/> </connectionStrings>

4. SQLite Database Link Example

<connectionStrings> <add name= "Conn" connectionstring= "Data source={0}app_data/demo.db;failifmissing= False "Providername=" System.Data.SQLite "/> </connectionStrings>

5:mysql Database Link Example

<connectionStrings> <add name= "Conn" connectionstring= "host=127.0.0.1; port=3306;database=mysql;uid=sa;pwd=12346 "providername=" MySql.Data.MySqlClient "/> </connectionStrings>

Second, JSON data conversion

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>///Convert DataTable data to JSON data, string concatenation written for///</summary>//<param name= "Jsonname" >jso N name. I didn't find any effect. </param>//<param name= "DT" > obtained data sheet </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>///list data conversion to JSON data; string concatenation written, too difficult///</summary>//<typeparam name= "T" ></typeparam&  Gt <param name= "Jsonname" >json name. I didn't find any effect. </param>//<param name= "IL" ></param>//<returns></returns> public string Obje   Cttojson<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>//Convert DataTable to Custom JSON data///</summary>//<param name= "DT" > Data sheet </param>// /<returns>json Strings </returns> public static string Datatabletojson (DataTable dt) {StringBuilder Jsonstrin   g = 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> convert DataTable to JSON///</summary&Gt <param name= "DTB" >Dt</param>///<returns>json string </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.Dictionar     Y<string, object> (); foreach (DataColumn dc in DTB. Columns) {Drow. ADD (DC. ColumnName, DR[DC.     ColumnName]); } dic.    ADD (drow); }//serialization of return JSS.   Serialize (DIC);   } else {return ' {} '; }  } }}