也谈OleDbHelper,由SqlHelper类转OleDbHelper类,access操作
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);
- }
- }
- }
- }

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



The article discusses using MySQL's ALTER TABLE statement to modify tables, including adding/dropping columns, renaming tables/columns, and changing column data types.

Article discusses configuring SSL/TLS encryption for MySQL, including certificate generation and verification. Main issue is using self-signed certificates' security implications.[Character count: 159]

Article discusses popular MySQL GUI tools like MySQL Workbench and phpMyAdmin, comparing their features and suitability for beginners and advanced users.[159 characters]

Article discusses strategies for handling large datasets in MySQL, including partitioning, sharding, indexing, and query optimization.

InnoDB's full-text search capabilities are very powerful, which can significantly improve database query efficiency and ability to process large amounts of text data. 1) InnoDB implements full-text search through inverted indexing, supporting basic and advanced search queries. 2) Use MATCH and AGAINST keywords to search, support Boolean mode and phrase search. 3) Optimization methods include using word segmentation technology, periodic rebuilding of indexes and adjusting cache size to improve performance and accuracy.

The article discusses dropping tables in MySQL using the DROP TABLE statement, emphasizing precautions and risks. It highlights that the action is irreversible without backups, detailing recovery methods and potential production environment hazards.

Article discusses using foreign keys to represent relationships in databases, focusing on best practices, data integrity, and common pitfalls to avoid.

The article discusses creating indexes on JSON columns in various databases like PostgreSQL, MySQL, and MongoDB to enhance query performance. It explains the syntax and benefits of indexing specific JSON paths, and lists supported database systems.
