C# 操作 access 数据库
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);
}
/// <summary>
/// 执行增加、删除、修改指令
/// </summary>
/// <param name="sql">增加、删除、修改的sql语句</param>
/// <param name="param">sql语句的参数</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>
/// 执行查询指令，获取返回的首行首列的值
/// </summary>
/// <param name="sql">查询sql语句</param>
/// <param name="param">sql语句的参数</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>
/// 执行查询指令，获取返回的datareader
/// </summary>
/// <param name="sql">查询sql语句</param>
/// <param name="param">sql语句的参数</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>
/// 执行查询指令，获取返回datatable
/// </summary>
/// <param name="sql">查询sql语句</param>
/// <param name="param">sql语句的参数</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);
}
}
}
}
}