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【Asp.Net】百万级分页查询（Oracle）

作者:Ingram / 发布于2016/1/8/ 675

包括ASP.NET和ASP.NET AJAX + JSON两个DEMO，最低耗时35ms左右（AJAX+JSON）。百万级数据库查询分页，使用Oracle 存储过程。Asp.net 2.0 + ,Oracle 10g +?开发环境：ASP.Net 2.0 - 4.5, Oracle 11g r2项目开源发布，供下载学习。需要自己建一个TEST数据表，包括3个字段ID,COL1,COL2。Description实现效果包括 ASP.NET和ASP.NET AJAX + JSON两个DEMO，最低耗时35ms左右（AJAX+JSON）。Oracle Selec


	using System;
	using System.Collections.Generic;
	
	using System.Web;
	using System.Text;
	using System.Reflection;
	using System.Collections;
	using System.Data;
	using System.Data.Common;
	
	namespace PaginationDemo
	{
	
	 /// <summary>
	 /// Modified by Willin Wang
	 /// http://www.willin.org/
	 /// Formats2JSON
	 /// </summary>
	 public class JsonHelper
	 {
	
	 /// <summary>
	 /// List转成json
	 /// </summary>
	 /// <typeparam name="T"></typeparam>
	 /// <param name="jsonName"></param>
	 /// <param name="list"></param>
	 /// <returns></returns>
	 public static string ListToJson<T>(IList<T> list, string jsonName)
	 {
	 StringBuilder Json = new StringBuilder();
	 if (string.IsNullOrEmpty(jsonName))
	 jsonName = list[0].GetType().Name;
	 Json.Append("{\"" + jsonName + "\":[");
	 if (list.Count > 0)
	 {
	 for (int i = 0; i < list.Count; i++)
	 {
	 T obj = Activator.CreateInstance<T>();
	 PropertyInfo[] pi = obj.GetType().GetProperties();
	 Json.Append("{");
	 for (int j = 0; j < pi.Length; j++)
	 {
	 Type type = pi[j].GetValue(list[i], null).GetType();
	 Json.Append("\"" + pi[j].Name.ToString() + "\":" + StringFormat(pi[j].GetValue(list[i], null).ToString(), type));
	 if (j < pi.Length - 1)
	 {
	 Json.Append(",");
	 }
	 }
	 Json.Append("}");
	 if (i < list.Count - 1)
	 {
	 Json.Append(",");
	 }
	 }
	 }
	 Json.Append("]}");
	 return Json.ToString();
	 }
	 /// <summary>
	 /// List转成json
	 /// </summary>
	 /// <typeparam name="T"></typeparam>
	 /// <param name="list"></param>
	 /// <returns></returns>
	 public static string ListToJson<T>(IList<T> list)
	 {
	 object obj = list[0];
	 return ListToJson<T>(list, obj.GetType().Name);
	 }
	 /// <summary>
	 /// 对象转换为Json字符串
	 /// </summary>
	 /// <param name="jsonObject">对象</param>
	 /// <returns>Json字符串</returns>
	 public static string ToJson(object jsonObject)
	 {
	 string jsonString = "{";
	 PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();
	 for (int i = 0; i < propertyInfo.Length; i++)
	 {
	 object objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, null);
	 string value = string.Empty;
	 if (objectValue is DateTime || objectValue is Guid || objectValue is TimeSpan)
	 {
	 value = "'" + objectValue.ToString() + "'";
	 }
	 else if (objectValue is string)
	 {
	 value = "'" + ToJson(objectValue.ToString()) + "'";
	 }
	 else if (objectValue is IEnumerable)
	 {
	 value = ToJson((IEnumerable)objectValue);
	 }
	 else
	 {
	 value = ToJson(objectValue.ToString());
	 }
	 jsonString += "\"" + ToJson(propertyInfo[i].Name) + "\":" + value + ",";
	 }
	 jsonString.Remove(jsonString.Length - 1, jsonString.Length);
	 return jsonString + "}";
	 }
	 /// <summary>
	 /// 对象集合转换Json
	 /// </summary>
	 /// <param name="array">集合对象</param>
	 /// <returns>Json字符串</returns>
	 public static string ToJson(IEnumerable array)
	 {
	 string jsonString = "[";
	 foreach (object item in array)
	 {
	 jsonString += ToJson(item) + ",";
	 }
	 jsonString.Remove(jsonString.Length - 1, jsonString.Length);
	 return jsonString + "]";
	 }
	 /// <summary>
	 /// 普通集合转换Json
	 /// </summary>
	 /// <param name="array">集合对象</param>
	 /// <returns>Json字符串</returns>
	 public static string ToArrayString(IEnumerable array)
	 {
	 string jsonString = "[";
	 foreach (object item in array)
	 {
	 jsonString = ToJson(item.ToString()) + ",";
	 }
	 jsonString.Remove(jsonString.Length - 1, jsonString.Length);
	 return jsonString + "]";
	 }
	 /// <summary>
	 /// Datatable转换为Json
	 /// </summary>
	 /// <param name="table">Datatable对象</param>
	 /// <returns>Json字符串</returns>
	 public static string ToJson(DataTable dt)
	 {
	 StringBuilder jsonString = new StringBuilder();
	
	 if (dt.Rows.Count == 0)
	 {
	 jsonString.Append("[{}]");
	 return jsonString.ToString();
	 }
	
	 jsonString.Append("[");
	 DataRowCollection drc = dt.Rows;
	 for (int i = 0; i < drc.Count; i++)
	 {
	 jsonString.Append("{");
	 for (int j = 0; j < dt.Columns.Count; j++)
	 {
	 string strKey = dt.Columns[j].ColumnName;
	 string strValue = drc[i][j].ToString();
	 Type type = dt.Columns[j].DataType;
	 jsonString.Append("\"" + strKey + "\":");
	 strValue = StringFormat(strValue, type);
	 if (j < dt.Columns.Count - 1)
	 {
	 jsonString.Append(strValue + ",");
	 }
	 else
	 {
	 jsonString.Append(strValue);
	 }
	 }
	 jsonString.Append("},");
	 }
	 jsonString.Remove(jsonString.Length - 1, 1);
	 jsonString.Append("]");
	 return jsonString.ToString();
	 }
	 /// <summary>
	 /// DataTable转成Json
	 /// </summary>
	 /// <param name="jsonName"></param>
	 /// <param name="dt"></param>
	 /// <returns></returns>
	 public static string ToJson(DataTable dt, string jsonName)
	 {
	 StringBuilder Json = new StringBuilder();
	 if (string.IsNullOrEmpty(jsonName))
	 jsonName = dt.TableName;
	 Json.Append("{\"" + jsonName + "\":[");
	 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++)
	 {
	 Type type = dt.Rows[i][j].GetType();
	 Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + StringFormat(dt.Rows[i][j].ToString(), type));
	 if (j < dt.Columns.Count - 1)
	 {
	 Json.Append(",");
	 }
	 }
	 Json.Append("}");
	 if (i < dt.Rows.Count - 1)
	 {
	 Json.Append(",");
	 }
	 }
	 }
	 Json.Append("]}");
	 return Json.ToString();
	 }
	 /// <summary>
	 /// DataReader转换为Json
	 /// </summary>
	 /// <param name="dataReader">DataReader对象</param>
	 /// <returns>Json字符串</returns>
	 public static string ToJson(DbDataReader dataReader)
	 {
	 StringBuilder jsonString = new StringBuilder();
	 jsonString.Append("[");
	 while (dataReader.Read())
	 {
	 jsonString.Append("{");
	 for (int i = 0; i < dataReader.FieldCount; i++)
	 {
	 Type type = dataReader.GetFieldType(i);
	 string strKey = dataReader.GetName(i);
	 string strValue = dataReader[i].ToString();
	 jsonString.Append("\"" + strKey + "\":");
	 strValue = StringFormat(strValue, type);
	 if (i < dataReader.FieldCount - 1)
	 {
	 jsonString.Append(strValue + ",");
	 }
	 else
	 {
	 jsonString.Append(strValue);
	 }
	 }
	 jsonString.Append("},");
	 }
	 dataReader.Close();
	 jsonString.Remove(jsonString.Length - 1, 1);
	 jsonString.Append("]");
	 return jsonString.ToString();
	 }
	 /// <summary>
	 /// DataSet转换为Json
	 /// </summary>
	 /// <param name="dataSet">DataSet对象</param>
	 /// <returns>Json字符串</returns>
	 public static string ToJson(DataSet dataSet)
	 {
	 string jsonString = "{";
	 foreach (DataTable table in dataSet.Tables)
	 {
	 jsonString += "\"" + table.TableName + "\":" + ToJson(table) + ",";
	 }
	 jsonString = jsonString.TrimEnd(',');
	 return jsonString + "}";
	 }
	 /// <summary>
	 /// 过滤特殊字符
	 /// </summary>
	 /// <param name="s"></param>
	 /// <returns></returns>
	 private static string String2Json(String s)
	 {
	 System.Text.StringBuilder sb = new StringBuilder();
	 for (int i = 0; i < s.Length; i++)
	 {
	 char c = s.ToCharArray()[i];
	
	 switch (c)
	 {
	 case '\"':
	 sb.Append("\\\""); break;
	 case '\\':
	 sb.Append("\\\\"); break;
	 case '/':
	 sb.Append("\\/"); break;
	 case '\b':
	 sb.Append("\\b"); break;
	 case '\f':
	 sb.Append("\\f"); break;
	 case '\n':
	 sb.Append("\\n"); break;
	 case '\r':
	 sb.Append("\\r"); break;
	 case '\t':
	 sb.Append("\\t"); break;
	 default:
	 sb.Append(c); break;
	 }
	 }
	 return sb.ToString();
	 }
	 /// <summary>
	 /// 格式化字符型、日期型、布尔型
	 /// </summary>
	 /// <param name="str"></param>
	 /// <param name="type"></param>
	 /// <returns></returns>
	 private static string StringFormat(string str, Type type)
	 {
	 if (type == typeof(string))
	 {
	 str = String2Json(str);
	 str = "\"" + str + "\"";
	 }
	 else if (type == typeof(DateTime))
	 {
	 str = "\"" + Convert.ToDateTime(str).ToShortDateString() + "\"";
	 }
	 else if (type == typeof(bool))
	 {
	 str = str.ToLower();
	 }
	
	 if (str.Length == 0)
	 str = "\"\"";
	
	 return str;
	 }
	 }
	}

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