也谈OleDbHelper,由SqlHelper类转OleDbHelper类，access操作-mysql教程-PHP中文網

首頁

資料庫

mysql教程

也谈OleDbHelper,由SqlHelper类转OleDbHelper类，access操作

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jun 07, 2016 pm 03:05 PM

今意外看见一贴子谈OleDbHelper，突然想起自已一直用的由SqlHelper类转成的OleDbHelper，在此分享，自己用了二年了，还没发现异常，代码如下： using System; using System.Data; using System.Data.OleDb; using System.Configuration; using System.Colle

今意外看见一贴子谈OleDbHelper，突然想起自已一直用的由SqlHelper类转成的OleDbHelper，在此分享，自己用了二年了，还没发现异常，代码如下：

using System;
using System.Data;
using System.Data.OleDb;
using System.Configuration;
using System.Collections;
using System.Data.Sql;
using System.Text;
namespace Lihui.Common
{
///
/// Summary description for OleDbHelper
///
public class OleDbHelper
{
//Database connection strings
public static readonly string CONN_STRING = ConfigurationManager.AppSettings["OleDbConnectionString"];
public static readonly string CONN_STRING1 = ConfigurationManager.AppSettings["OleDbConnectionString1"];
// Hashtable to store cached parameters
private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
#region =ExecuteNonQuery=
public static int ExecuteNonQuery(string connString, CommandType cmdType, string cmdText)
{
return ExecuteNonQuery(connString, cmdType, cmdText, null);
}
public static int ExecuteNonQuery(OleDbConnection conn, CommandType cmdType, string cmdText)
{
return ExecuteNonQuery(conn, cmdType, cmdText, null);
}
public static int ExecuteNonQuery(OleDbTransaction trans, CommandType cmdType, string cmdText)
{
return ExecuteNonQuery(trans, cmdType, cmdText, null);
}
public static int ExecuteNonQuery(string connString, CommandType cmdType, string cmdText, params OleDbParameter[] cmdParms)
{
OleDbCommand cmd = new OleDbCommand();
using (OleDbConnection conn = new OleDbConnection(connString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
//清除cmd的参数
cmd.Parameters.Clear();
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
return val;
}
}
public static int ExecuteNonQuery(OleDbConnection conn, CommandType cmdType, string cmdText, params OleDbParameter[] cmdParms)
{
OleDbCommand cmd = new OleDbCommand();
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
return val;
}
public static int ExecuteNonQuery(OleDbTransaction trans, CommandType cmdType, string cmdText, params OleDbParameter[] cmdParms)
{
OleDbCommand cmd = new OleDbCommand();
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
if (cmd.Connection.State == ConnectionState.Open)
{
cmd.Connection.Close();
}
return val;
}
#endregion
#region =ExecuteReader=
public static OleDbDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
{
//pass through the call providing null for the set of OleDbParameters
return ExecuteReader(connectionString, commandType, commandText, (OleDbParameter[])null);
}
public static OleDbDataReader ExecuteReader(string connString, CommandType cmdType, string cmdText, params OleDbParameter[] cmdParms)
{
OleDbCommand cmd = new OleDbCommand();
OleDbConnection conn = new OleDbConnection(connString);
try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
OleDbDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
return rdr;
}
catch
{
conn.Close();
throw;
}
}
#endregion
#region =ExecuteDataset=
public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
{
return ExecuteDataset(connectionString, commandType, commandText, (OleDbParameter[])null);
}
public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params OleDbParameter[] commandParameters)
{
using (OleDbConnection cn = new OleDbConnection(connectionString))
{
cn.Open();
//调用重载方法
return ExecuteDataset(cn, commandType, commandText, commandParameters);
}
}
public static DataSet ExecuteDataset(OleDbConnection connection, CommandType commandType, string commandText)
{
return ExecuteDataset(connection, commandType, commandText, (OleDbParameter[])null);
}
public static DataSet ExecuteDataset(OleDbConnection connection, CommandType commandType, string commandText, params OleDbParameter[] commandParameters)
{
//创建一个OleDbCommand对象，并对其进行初始化
OleDbCommand cmd = new OleDbCommand();
PrepareCommand(cmd, connection, (OleDbTransaction)null, commandType, commandText, commandParameters);
//创建OleDbDataAdapter对象以及DataSet
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
DataSet ds = new DataSet();
//填充ds
da.Fill(ds);
// 清除cmd的参数集合
cmd.Parameters.Clear();
if (cmd.Connection.State == ConnectionState.Open)
{
cmd.Connection.Close();
}
//返回ds
return ds;
}
#endregion
#region =ExecuteDataTable=
public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText)
{
return ExecuteDataTable(connectionString, commandType, commandText, (OleDbParameter[])null);
}
public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText, params OleDbParameter[] commandParameters)
{
using (OleDbConnection cn = new OleDbConnection(connectionString))
{
cn.Open();
//调用重载方法
return ExecuteDataTable(cn, commandType, commandText, commandParameters);
}
}
public static DataTable ExecuteDataTable(OleDbConnection connection, CommandType commandType, string commandText)
{
return ExecuteDataTable(connection, commandType, commandText, (OleDbParameter[])null);
}
public static DataTable ExecuteDataTable(OleDbConnection connection, CommandType commandType, string commandText, params OleDbParameter[] commandParameters)
{
//创建一个OleDbCommand对象，并对其进行初始化
OleDbCommand cmd = new OleDbCommand();
PrepareCommand(cmd, connection, (OleDbTransaction)null, commandType, commandText, commandParameters);
//创建OleDbDataAdapter对象以及DataSet
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
DataSet ds = new DataSet();
//填充ds
da.Fill(ds);
// 清除cmd的参数集合
cmd.Parameters.Clear();
if (cmd.Connection.State == ConnectionState.Open)
{
cmd.Connection.Close();
}
//返回ds
return ds.Tables[0];
}
#endregion
#region =ExecuteScalar=
public static object ExecuteScalar(string connString, CommandType cmdType, string cmdText)
{
return ExecuteScalar(connString, cmdType, cmdText, null);
}
public static object ExecuteScalar(string connString, CommandType cmdType, string cmdText, params OleDbParameter[] cmdParms)
{
OleDbCommand cmd = new OleDbCommand();
using (OleDbConnection conn = new OleDbConnection(connString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
return val;
}
}
public static object ExecuteScalar(OleDbConnection conn, CommandType cmdType, string cmdText)
{
return ExecuteScalar(conn, cmdType, cmdText, null);
}
public static object ExecuteScalar(OleDbConnection conn, CommandType cmdType, string cmdText, params OleDbParameter[] cmdParms)
{
OleDbCommand cmd = new OleDbCommand();
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
return val;
}
#endregion
public static void CacheParameters(string cacheKey, params OleDbParameter[] cmdParms)
{
parmCache[cacheKey] = cmdParms;
}
public static OleDbParameter[] GetCachedParameters(string cacheKey)
{
OleDbParameter[] cachedParms = (OleDbParameter[])parmCache[cacheKey];
if (cachedParms == null)
return null;
OleDbParameter[] clonedParms = new OleDbParameter[cachedParms.Length];
for (int i = 0, j = cachedParms.Length; i
clonedParms[i] = (OleDbParameter)((ICloneable)cachedParms[i]).Clone();
return clonedParms;
}
public static void PrepareCommand(OleDbCommand cmd, OleDbConnection conn, OleDbTransaction trans, CommandType cmdType, string cmdText, OleDbParameter[] cmdParms)
{
//判断连接的状态。如果是关闭状态，则打开
if (conn.State != ConnectionState.Open)
conn.Open();
//cmd属性赋值
cmd.Connection = conn;
cmd.CommandText = cmdText;
//是否需要用到事务处理
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = cmdType;
//添加cmd需要的存储过程参数
if (cmdParms != null)
{
foreach (OleDbParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
}
}

使用方法跟SqlHelper类相似。

陳述

本文內容由網友自願投稿，版權歸原作者所有。本站不承擔相應的法律責任。如發現涉嫌抄襲或侵權的內容，請聯絡admin@php.cn

將用戶添加到MySQL：完整的教程May 12, 2025 am 12:14 AM

掌握添加MySQL用戶的方法對於數據庫管理員和開發者至關重要，因為它確保數據庫的安全性和訪問控制。 1)使用CREATEUSER命令創建新用戶，2)通過GRANT命令分配權限，3)使用FLUSHPRIVILEGES確保權限生效，4)定期審計和清理用戶賬戶以維護性能和安全。

掌握mySQL字符串數據類型：varchar vs.文本與charMay 12, 2025 am 12:12 AM

chosecharforfixed-lengthdata，varcharforvariable-lengthdata，andtextforlargetextfield.1）chariseffity forconsistent-lengthdatalikecodes.2）varcharsuitsvariable-lengthdatalikenames，ballancingflexibilitibility andperformance.3）

MySQL：字符串數據類型和索引：最佳實踐May 12, 2025 am 12:11 AM

在MySQL中處理字符串數據類型和索引的最佳實踐包括：1)選擇合適的字符串類型，如CHAR用於固定長度，VARCHAR用於可變長度，TEXT用於大文本；2)謹慎索引，避免過度索引，針對常用查詢創建索引；3)使用前綴索引和全文索引優化長字符串搜索；4)定期監控和優化索引，保持索引小巧高效。通過這些方法，可以在讀取和寫入性能之間取得平衡，提升數據庫效率。

mysql：如何遠程添加用戶May 12, 2025 am 12:10 AM

ToaddauserremotelytoMySQL,followthesesteps:1)ConnecttoMySQLasroot,2)Createanewuserwithremoteaccess,3)Grantnecessaryprivileges,and4)Flushprivileges.BecautiousofsecurityrisksbylimitingprivilegesandaccesstospecificIPs,ensuringstrongpasswords,andmonitori

MySQL字符串數據類型的最終指南：有效的數據存儲May 12, 2025 am 12:05 AM

tostorestringsefliceflicyInmySql，ChooSetherightDataTypeBasedyOrneOrneEds：1）USEcharforFixed-LengthStstringStringStringSlikeCountryCodes.2）UseVarcharforvariable-lengtthslikenames.3）USETEXTCONTENT.3）

mysql blob vs.文本：為大對象選擇正確的數據類型May 11, 2025 am 12:13 AM

選擇MySQL的BLOB和TEXT數據類型時，BLOB適合存儲二進制數據，TEXT適合存儲文本數據。 1)BLOB適用於圖片、音頻等二進制數據，2)TEXT適用於文章、評論等文本數據，選擇時需考慮數據性質和性能優化。

MySQL：我應該將root用戶用於產品嗎？May 11, 2025 am 12:11 AM

No,youshouldnotusetherootuserinMySQLforyourproduct.Instead,createspecificuserswithlimitedprivilegestoenhancesecurityandperformance:1)Createanewuserwithastrongpassword,2)Grantonlynecessarypermissionstothisuser,3)Regularlyreviewandupdateuserpermissions

MySQL字符串數據類型說明了：選擇適合您數據的合適類型May 11, 2025 am 12:10 AM

mySqlStringDatatAtatPessHouldBechoseBasedondatActarActeristicsAndusecases：1）USEcharforFixed lengthStstringStringStringSlikeCountryCodes.2）usevarcharforvariable-lengtthslikeLikenames.3）usebarnionororvarinyorvarinyorvarybinarydatalgebenedaTalgeextocrabextrapon.4）

See all articles