C#access数据库操作

比较凌乱，有时间在整理吧。

Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data source=c:/D.mdb;Jet OLEDB:DataBase Password=123456!"


 private void GetCon()
       {
       string strConnection="PRovider=Microsoft.Jet.OleDb.4.0;";
               strConnection+=@"Data Source=C:BegaspNETNorthwind.mdb";

        OleDbConnection objConnection=new OleDbConnection(strConnection);


      objConnection.Open();
      objConnection.Close();

       }

 
以独占的方式打开

文件--信息--加密/解密

PRovider=Microsoft.Jet.OleDb.4.0;Jet OLEDB:DataBase Password=123456789;Data Source=D:ToWife.mdb;
1.
set dbconnection=Server.CREATEOBJECT("ADODB.CONNECTION")
DBPath = Server.MapPath("customer.mdb")
dbconnection.Open "driver={Microsoft Access Driver (*.mdb)};dbq=" & DBPath
SQL="select * from auth where id="" & user_id &"""
SET uplist=dbconnection.EXECUTE(SQL)



2.
set dbconnection=Server.CreateObject("ADODB.Connection")
DBPath = Server.MapPath("customer.mdb")
dbconnection.Open "provider=microsoft.jet.oledb.4.0;data source="&dbpath
SQL="select * from auth where id="" & user_id &"""
SET uplist=dbconnection.EXECUTE(SQL)



3.
DBPath = Server.MapPath("customer.mdb")
set session("rs")=Server.CreateObject("ADODB.Recordset")
" rs=Server.CreateObject("ADODB.Recordset")
connstr="provider=microsoft.jet.oledb.4.0;data source="&dbpath
SQL="select * from auth where id="" & user_id &"""
session("rs").Open sql,connstr,1,3

连接access2007

OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;User ID=Admin;Data Source=D:/数据库.accdb;Jet OLEDB:Database Password=123456;

 连接access2003

OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;User ID=Admin";Data Source=D:/数据库.mdb;Jet OLEDB:Database password=123456;")

建odbc源

set conn=server.createobject("Adodb.connection")
conn.open "DSN=xxx;UID=;PWD=123456;Database=XXX" 

破解密码

 public static string GetMDBPassword(string file)
        {                      
            // 未加密的MDB文件，0x42到0x61之间的每间隔一字节的数值
            byte[] baseByte = { 0xbe, 0xec, 0x65, 0x9c, 0xfe, 0x28, 0x2b, 0x8a, 0x6c, 0x7b, 0xcd, 0xdf, 0x4f, 0x13, 0xf7, 0xb1, };
            byte flagByte = 0x0c; // 标志 0x62 处的数值
            string password = "";
            try
            {
                FileStream fs = File.OpenRead(file);
                fs.Seek(0x14, SeekOrigin.Begin);
                byte ver = (byte)fs.ReadByte();     // 取得access版本, 1为Access2000/2003, 0为Access97
                fs.Seek(0x42, SeekOrigin.Begin);
                byte[] bs = new byte[33];
                if (fs.Read(bs, 0, 33) != 33) return "";
                byte flag = (byte)(bs[32] ^ flagByte);
                for (int i = 0; i < 16; i++)
                {
                    byte b = (byte)(baseByte[i] ^ bs[i * 2]);
                    if (i % 2 == 0 && ver == 1) b ^= flag; //Access 2000/2003
                    if (b > 0) password += (char)b;
                }
            }
            catch { }

            return ( password.Equals( "" ) ? "没有密码!" : password );
        }

up

private int up(string sql)
        {
            int index = 0;
            OleDbConnection con = GetCon();            
            try
            {
                if (con!=null)
                {
                    con.Open();
                    OleDbCommand oc = new OleDbCommand(sql, con);
                    return oc.ExecuteNonQuery();
                }
                return 0;
            }
            catch (Exception)
            {
                return 0;
            }
        }

select

 private DataTable select(string sql)
        {
            DataTable dt = new DataTable();
            OleDbConnection con = GetCon();
            try
            {
                if (con!=null)
                {
                    con.Open();
                    //用   OleDbDataAdapter   得到一个数据集
                    OleDbDataAdapter myCommand = new OleDbDataAdapter(sql,con);
                    DataSet myDataSet = new DataSet();
                    //把Dataset绑定books数据表
                    myCommand.Fill(myDataSet);
                    con.Close();
                    return myDataSet.Tables[0]; 
                }
                con.Close();
                return null;
            }
            catch (Exception)
            {
                con.Close();
                return null;
            }
        }

主键的操作
Function AddPrimaryKey()
'添加主键到[编号]字段
Dim strSQL As String
strSQL = "ALTER TABLE 表1 ADD CONSTRAINT PRIMARY_KEY " _
& "PRIMARY KEY (编号)"
CurrentProject.Connection.Execute strSQL
End Function

Function DropPrimaryKey()
'删除主键
Dim strSQL As String
strSQL = "ALTER TABLE 表1 Drop CONSTRAINT PRIMARY_KEY "
CurrentProject.Connection.Execute strSQL
End Function