C# 应用程序类中定义ACCESS数据库文件地址的方法

C# 应用程序类中定义ACCESS数据库文件地址的方法
方法一:
数据库访问类
using System;
using System.Collections.Generic;
using System.Text;
using System.Data.OleDb;
using System.Data;

namespace Link.DataBase
{
public class DBManage
{
System.Data.OleDb.OleDbConnection gConn = null;

public OleDbConnection Conn
{
get { return gConn; }
}
//定义类公开对外的数据库连接对象变量
static string strConnectionString;
//设置数据链接参数
static public string ConnectionString
{
set
{
strConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + value + ";User ID=admin;Password=;Jet OLEDB:Database Password=";
}
}

//数据库连接对象
public DBManage()
{
gConn = new OleDbConnection(strConnectionString);
}
//查询数据库资料
public OleDbDataReader ExecuteReader(string SQL)
{
OleDbDataReader reValue = null;
OleDbCommand comm = new OleDbCommand();
comm.CommandText = SQL;
comm.Connection = gConn;
reValue = comm.ExecuteReader();
return reValue;
}
//执行SQL查询语句返回数据表对象
public DataTable ExecuteTable(string SQL)
{
DataTable table = new DataTable();
gConn.Open();
OleDbCommand comm = new OleDbCommand();
comm.CommandText = SQL;
comm.Connection = gConn;
System.Data.OleDb.OleDbDataAdapter adapter = new System.Data.OleDb.OleDbDataAdapter(comm);
System.Data.OleDb.OleDbCommandBuilder commBuild = new System.Data.OleDb.OleDbCommandBuilder(adapter);
table.Locale = System.Globalization.CultureInfo.InvariantCulture;
adapter.Fill(table);
gConn.Close();
return table;
}
//直接运行输入SQL语句参数
public void ExecuteNonQuery(string SQL)
{
OleDbCommand comm = new OleDbCommand();
gConn.Open();
comm.CommandText = SQL;
comm.Connection = gConn;
comm.ExecuteNonQuery();
gConn.Close();
}

}
}
窗体调用方法

public LinksManagement()
{
DBManage.ConnectionString = Application.StartupPath + @"/ExchangeLinksDB.mdb";
InitializeComponent();
}

方法二:

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.OleDb;

//数据访问层
namespace Link.DataBase
{
public class CreateUrlManager
{

private OleDbConnection cnn;

private static string strConnectionString;

public CreateUrlManager()
{
if (System.Environment.CurrentDirectory == AppDomain.CurrentDomain.BaseDirectory)//Windows应用程序则相等
{
strConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + AppDomain.CurrentDomain.BaseDirectory + "Bin//ExchangeLinksDB.mdb;";
}
else//Windows类程序不相等
{
strConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + AppDomain.CurrentDomain.BaseDirectory + "ExchangeLinksDB.mdb;";
}
}

}