根据SqlHelper改造的OleDbHelper。
就改造了几个常用的方法,够用就好,加上一个网上的Access分页。
using System;
using System.Configuration;
using System.Data;
using System.Data.OleDb;
using System.Collections.Generic;
using Shuaishuai.OhAspNet.BLL.Entity;
using Shuaishuai.OhAspNet.BLL.Dao;
namespace Shuaishuai.OhAspNet.DAL
{
public abstract class OleDbHelper
{
private static Dictionary<string, OleDbParameter[]> parmCache = new Dictionary<string, OleDbParameter[]>();
internal const int CommandTimeout = 3;
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/// <summary>
/// 获得连接对象
/// </summary>
/// <returns></returns>
internal static OleDbConnection GetOleDbConnection()
{
return new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data Source=E:\\OhAsp.Net\\OhAsp.Net For Access\\Shuaishuai.OhAspNet.Web\\OH-ASP.NET-DB\\OHASPNETDB.mdb;");
}
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/// <summary>
/// 返回受影响的行数
/// </summary>
/// <param name="cmdText">a</param>
/// <param name="commandParameters">传入的参数</param>
/// <returns></returns>
public static int ExecuteNonQuery(string cmdText, params OleDbParameter[] commandParameters)
{
OleDbCommand command = new OleDbCommand();
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using (OleDbConnection connection = GetOleDbConnection())
{
PrepareCommand(command, connection, CommandType.Text, cmdText, commandParameters);
int val = command.ExecuteNonQuery();
command.Parameters.Clear();
connection.Close();
return val;
}
}
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public static int ExecuteNonQuery(CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
{
OleDbCommand command = new OleDbCommand();
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using (OleDbConnection connection = GetOleDbConnection())
{
PrepareCommand(command, connection, cmdType, cmdText, commandParameters);
int val = command.ExecuteNonQuery();
command.Parameters.Clear();
connection.Close();
return val;
}
}
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/// <summary>
/// 返回SqlDataReader对象
/// </summary>
/// <param name="cmdText"></param>
/// <param name="commandParameters">传入的参数</param>
/// <returns></returns>
public static OleDbDataReader ExecuteReader(string cmdText, params OleDbParameter[] commandParameters)
{
OleDbCommand command = new OleDbCommand();
OleDbConnection connection = GetOleDbConnection();
try
{
PrepareCommand(command, connection, CommandType.Text, cmdText, commandParameters);
OleDbDataReader reader = command.ExecuteReader(CommandBehavior.CloseConnection);
command.Parameters.Clear();
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return reader;
}
catch
{
connection.Close();
throw;
}
}
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public static OleDbDataReader ExecuteReader(CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
{
OleDbCommand command = new OleDbCommand();
OleDbConnection connection = GetOleDbConnection();
try
{
PrepareCommand(command, connection, cmdType, cmdText, commandParameters);
OleDbDataReader reader = command.ExecuteReader(CommandBehavior.CloseConnection);
command.Parameters.Clear();
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return reader;
}
catch
{
connection.Close();
throw;
}
}
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/// <summary>
/// 返回结果集中的第一行第一列,忽略其他行或列
/// </summary>
/// <param name="cmdText"></param>
/// <param name="commandParameters">传入的参数</param>
/// <returns></returns>
public static object ExecuteScalar(string cmdText, params OleDbParameter[] commandParameters)
{
OleDbCommand cmd = new OleDbCommand();
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using (OleDbConnection connection = GetOleDbConnection())
{
PrepareCommand(cmd, connection, CommandType.Text, cmdText, commandParameters);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
connection.Close();
return val;
}
}
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public static object ExecuteScalar(CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
{
OleDbCommand cmd = new OleDbCommand();
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using (OleDbConnection connection = GetOleDbConnection())
{
PrepareCommand(cmd, connection, cmdType, cmdText, commandParameters);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
connection.Close();
return val;
}
}
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/// <summary>
/// 把一个参数数组存入缓存
/// </summary>
/// <param name="cacheKey">缓存参数数组使用的键</param>
/// <param name="cmdParms">要缓存的一组参数</param>
public static void CacheParameters(string cacheKey, params OleDbParameter[] commandParameters)
{
parmCache[cacheKey] = commandParameters;
}
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/// <summary>
/// 从缓存中得到一个参数数组
/// </summary>
/// <param name="cacheKey">缓存参数数组使用的键</param>
/// <returns>缓存的一组参数</returns>
public static OleDbParameter[] GetCachedParameters(string cacheKey)
{
OleDbParameter[] cachedParms;
if (!parmCache.TryGetValue(cacheKey, out cachedParms))
return null;
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OleDbParameter[] clonedParms = new OleDbParameter[cachedParms.Length];
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for (int i = 0, j = cachedParms.Length; i < j; i++)
clonedParms[i] = (OleDbParameter)((ICloneable)cachedParms[i]).Clone();
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return clonedParms;
}
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private static void PrepareCommand(OleDbCommand cmd, OleDbConnection conn, CommandType cmdType, string cmdText, OleDbParameter[] cmdParms)
{
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if (conn.State != ConnectionState.Open)
conn.Open();
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cmd.Connection = conn;
cmd.CommandText = cmdText;
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cmd.CommandType = cmdType;
cmd.CommandTimeout = CommandTimeout;
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if (cmdParms != null)
{
foreach (OleDbParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
/// <summary>
/// 公用分页
/// </summary>
/// <param name="pageIndex"></param>
/// <param name="pageSize"></param>
/// <param name="showString"></param>
/// <param name="queryString"></param>
/// <param name="whereString"></param>
/// <param name="orderString"></param>
/// <param name="pageCount"></param>
/// <param name="recordCount"></param>
/// <param name="connection"></param>
/// <returns></returns>
public static OleDbDataReader ExecutePager(int pageIndex, int pageSize, string idColumn, string showString, string queryString, string whereString, string orderString, out int pageCount, out int recordCount,out OleDbConnection connection)
{
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if (pageIndex < 1)
{
pageIndex = 1;
}
else
{
pageIndex = pageIndex+1;
}
if (pageSize < 1) pageSize = 10;
if (string.IsNullOrEmpty(showString)) showString = "*";
if (string.IsNullOrEmpty(orderString)) orderString = "ID desc";
connection = GetOleDbConnection();
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connection.Open();
string myVw = string.Format(" ( {0} ) tempVw ", queryString);
//string myVw = "Articles";
OleDbCommand cmdCount = new OleDbCommand(string.Format(" select count(0) as recordCount from {0} {1}", myVw, whereString), connection);
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recordCount = Convert.ToInt32(cmdCount.ExecuteScalar());
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if ((recordCount % pageSize) > 0)
pageCount = recordCount / pageSize + 1;
else
pageCount = recordCount / pageSize;
OleDbCommand cmdRecord;
if (pageIndex == 1)//第一页
{
cmdRecord = new OleDbCommand(string.Format("select top {0} {1} from {2} {3} order by {4} ", pageSize, showString, myVw, whereString, orderString), connection);
}
else if (pageIndex > pageCount)//超出总页数
{
cmdRecord = new OleDbCommand(string.Format("select top {0} {1} from {2} {3} order by {4} ", pageSize, showString, myVw, "where 1=2", orderString), connection);
}
else
{
int pageLowerBound = pageSize * pageIndex;
int pageUpperBound = pageLowerBound - pageSize;
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OleDbCommand cmd = new OleDbCommand(string.Format("select top {0} {1} from {2} {3} order by {4} ", pageLowerBound, showString, myVw, whereString, orderString), connection);
string result = string.Empty;
using (IDataReader dr = cmd.ExecuteReader())
{
while (dr.Read())
{
if (pageUpperBound < 1)
{
result += "," + dr.GetInt32(0);
}
pageUpperBound--;
}
}
string recordIDs =result.Substring(1);
cmdRecord = new OleDbCommand(string.Format("select top {0} {1} from {2} where {3} in ({4}) order by {5} ", pageSize, showString, myVw, idColumn, recordIDs, orderString), connection);
}
return cmdRecord.ExecuteReader();
}
}
}
点击下载:OleDbHelper
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