lingfeng95通过本文主要向大家介绍了json asp.net,数据库连接 asp.net,数据库asp.net,asp.net,asp net培训等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
一、数据库连接语句
1、MSSQL数据库链接示例
<connectionStrings> <add name="Conn" connectionString="server=.;database=demo;uid=sa;pwd=123456" providerName="System.Data.SqlClient"/> </connectionStrings></div>
2、Access 2003数据库链接示例："{0}"代表根目录
<connectionStrings>
<add name="Conn" connectionString="Provider=Microsoft.Jet.OLEDB.4.0; Data Source={0}App_Data/demo.mdb" providerName="System.Data.OleDb"/>
</connectionStrings>
</div>
Access 2007或以上版本的链接
<connectionStrings>
<add name="Conn" connectionString="Provider=Microsoft.Jet.OLEDB.4.0; Data Source={0}App_Data/demo.mdb" providerName="System.Data.OleDb"/>
</connectionStrings>
</div>
3、Oracle 数据库链接示例
<connectionStrings> <add name="Conn" connectionString="Provider=MSDAORA;Data Source=demo;User ID=sa;Password=123456;" providerName="System.Data.OracleClient"/> </connectionStrings></div>
4、SQLite 数据库链接示例
<connectionStrings>
<add name="Conn" connectionString="Data Source={0}App_Data/demo.db;failifmissing=false" providerName="System.Data.SQLite"/>
</connectionStrings>
</div>
5：MySQL数据库链接示例
<connectionStrings> <add name="Conn" connectionString="host=127.0.0.1;Port=3306;Database=mysql;uid=sa;pwd=12346" providerName="MySql.Data.MySqlClient"/> </connectionStrings>
</div>
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 "{}";
}
}
}
}
</div>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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