随笔:
(1) 命名空间
using System.Data.OleDb;
(2) 连接字符串
private staticstring connStr = @"Provider= Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb";
注意:
a、DataSource = 数据库存放的路径(这里数据库放到了D盘目录下)
b、 2003版本的Access数据库链接字符串: privatestatic stringconnStr =@"Provider = Microsoft.Jet.OLEDB.4.0;DataSource = d:\login.mdb";
2007版本的Access数据库链接字符串:privatestaticstring connStr =@"Provider= Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb";
(3) 建立连接:
OleDbConnection tempconn =new OleDbConnection(connStr);
(4) 使用OleDbCommand类来执行Sql语句:
OleDbCommand cmd = new OleDbCommand(sql, tempconn);
tempconn.Open();
cmd.ExecuteNonQuery();
栗子(工具类):
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); } ////// 执行增加、删除、修改指令 /// /// 增加、删除、修改的sql语句 /// sql语句的参数 ///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()); } } } /// /// 执行查询指令,获取返回的首行首列的值 /// /// 查询sql语句 /// sql语句的参数 ///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()); } } } /// /// 执行查询指令,获取返回的datareader /// /// 查询sql语句 /// sql语句的参数 ///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)); } /// /// 执行查询指令,获取返回datatable /// /// 查询sql语句 /// sql语句的参数 ///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); } } } }}