隨筆：

（1）???命名空間

??????????? using?System.Data.OleDb;

（2）???連接字符串

??????????? private?staticstring?connStr =?@"Provider= Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb";

??????????? 注意：

???????????? a、DataSource = 數據庫存放的路徑（這里數據庫放到了D盤目錄下）

???????????? b、?2003版本的Access數據庫鏈接字符串：??privatestatic?stringconnStr =@"Provider = Microsoft.Jet.OLEDB.4.0;DataSource = d:\login.mdb";

?????????????????? 2007版本的Access數據庫鏈接字符串：privatestaticstring?connStr =@"Provider= Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb";

（3）???建立連接：

??????????? OleDbConnection?tempconn =new?OleDbConnection(connStr);

（4）???使用OleDbCommand類來執行Sql語句：

?????????? OleDbCommand?cmd?=?new?OleDbCommand(sql,?tempconn); ?

?????????? tempconn.Open();

?????????? cmd.ExecuteNonQuery();

?

?

栗子（工具類）：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Data.OleDb;using System.Windows.Forms;using System.Data;namespace test{class AccessHelper{private static string connStr = @"Provider = Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb";public static OleDbConnection GetConn(){OleDbConnection tempconn = new OleDbConnection(connStr);MessageBox.Show(tempconn.DataSource);tempconn.Open();MessageBox.Show(tempconn.State.ToString());return (tempconn);}/// <summary>/// 執行增加、刪除、修改指令/// </summary>/// <param name="sql">增加、刪除、修改的sql語句</param>/// <param name="param">sql語句的參數</param>/// <returns></returns>public static int ExecuteNonQuery(string sql, params OleDbParameter[] param){using (OleDbConnection conn = new OleDbConnection(connStr)){using (OleDbCommand cmd = new OleDbCommand(sql,conn)){if (param != null){cmd.Parameters.AddRange(param);}conn.Open();return(cmd.ExecuteNonQuery());}}}/// <summary>/// 執行查詢指令，獲取返回的首行首列的值/// </summary>/// <param name="sql">查詢sql語句</param>/// <param name="param">sql語句的參數</param>/// <returns></returns>public static object ExecuteScalar(string sql, params OleDbParameter[] param){using (OleDbConnection conn = new OleDbConnection(connStr)){using (OleDbCommand cmd = new OleDbCommand(sql, conn)){if (param != null){cmd.Parameters.AddRange(param);}conn.Open();return (cmd.ExecuteScalar());}}}/// <summary>/// 執行查詢指令，獲取返回的datareader/// </summary>/// <param name="sql">查詢sql語句</param>/// <param name="param">sql語句的參數</param>/// <returns></returns>public static OleDbDataReader ExecuteReader(string sql, params OleDbParameter[] param){OleDbConnection conn = new OleDbConnection(connStr);OleDbCommand cmd = conn.CreateCommand();cmd.CommandText = sql;cmd.CommandType = CommandType.Text;if (param != null){cmd.Parameters.AddRange(param);}conn.Open();return (cmd.ExecuteReader(CommandBehavior.CloseConnection));}/// <summary>/// 執行查詢指令，獲取返回datatable/// </summary>/// <param name="sql">查詢sql語句</param>/// <param name="param">sql語句的參數</param>/// <returns></returns>public static DataTable ExecuteDatable(string sql, params OleDbParameter[] param){using (OleDbConnection conn = new OleDbConnection(connStr)){using (OleDbCommand cmd = new OleDbCommand(sql, conn)){if (param != null){cmd.Parameters.AddRange(param);}DataTable dt = new DataTable();OleDbDataAdapter sda = new OleDbDataAdapter(cmd);sda.Fill(dt);return (dt);}}}}}

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