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=!"

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

.
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)

.
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,,

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=;")

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[];
                 if (fs.Read(bs, , ) != ) return "";
                 byte flag = (byte)(bs[] ^ flagByte);
                 for (int i = ; i < ; i++)
                 {
                     byte b = (byte)(baseByte[i] ^ bs[i * ]);
                     if (i %  ==  && ver == ) b ^= flag; //Access 2000/2003
                     if (b > ) password += (char)b;
                 }
             }
             catch { }

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

up

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

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[];
                 }
                 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