C#access数据库操作

比较凌乱，有时间在整理吧。

 1 Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data source=c:/D.mdb;Jet OLEDB:DataBase Password=123456!"
 2 
 3 
 4  private void GetCon()
 5        {
 6        string strConnection="PRovider=Microsoft.Jet.OleDb.4.0;";
 7                strConnection+=@"Data Source=C:BegaspNETNorthwind.mdb";
 8 
 9         OleDbConnection objConnection=new OleDbConnection(strConnection);
10 
11 
12       objConnection.Open();
13       objConnection.Close();
14 
15        }

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

1 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

 1  public static string GetMDBPassword(string file)
 2         {                      
 3             // 未加密的MDB文件，0x42到0x61之间的每间隔一字节的数值
 4             byte[] baseByte = { 0xbe, 0xec, 0x65, 0x9c, 0xfe, 0x28, 0x2b, 0x8a, 0x6c, 0x7b, 0xcd, 0xdf, 0x4f, 0x13, 0xf7, 0xb1, };
 5             byte flagByte = 0x0c; // 标志 0x62 处的数值
 6             string password = "";
 7             try
 8             {
 9                 FileStream fs = File.OpenRead(file);
10                 fs.Seek(0x14, SeekOrigin.Begin);
11                 byte ver = (byte)fs.ReadByte();     // 取得access版本, 1为Access2000/2003, 0为Access97
12                 fs.Seek(0x42, SeekOrigin.Begin);
13                 byte[] bs = new byte[33];
14                 if (fs.Read(bs, 0, 33) != 33) return "";
15                 byte flag = (byte)(bs[32] ^ flagByte);
16                 for (int i = 0; i < 16; i++)
17                 {
18                     byte b = (byte)(baseByte[i] ^ bs[i * 2]);
19                     if (i % 2 == 0 && ver == 1) b ^= flag; //Access 2000/2003
20                     if (b > 0) password += (char)b;
21                 }
22             }
23             catch { }
24 
25             return ( password.Equals( "" ) ? "没有密码!" : password );
26         }

 1 private int up(string sql)
 2         {
 3             int index = 0;
 4             OleDbConnection con = GetCon();            
 5             try
 6             {
 7                 if (con!=null)
 8                 {
 9                     con.Open();
10                     OleDbCommand oc = new OleDbCommand(sql, con);
11                     return oc.ExecuteNonQuery();
12                 }
13                 return 0;
14             }
15             catch (Exception)
16             {
17                 return 0;
18             }
19         }

select

 1  private DataTable select(string sql)
 2         {
 3             DataTable dt = new DataTable();
 4             OleDbConnection con = GetCon();
 5             try
 6             {
 7                 if (con!=null)
 8                 {
 9                     con.Open();
10                     //用   OleDbDataAdapter   得到一个数据集
11                     OleDbDataAdapter myCommand = new OleDbDataAdapter(sql,con);
12                     DataSet myDataSet = new DataSet();
13                     //把Dataset绑定books数据表
14                     myCommand.Fill(myDataSet);
15                     con.Close();
16                     return myDataSet.Tables[0]; 
17                 }
18                 con.Close();
19                 return null;
20             }
21             catch (Exception)
22             {
23                 con.Close();
24                 return null;
25             }
26         }

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

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