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连接数据库查询手册

 2002-08-19 09:56:41 来源:WEB开发网   
核心提示:下面将简单介绍一下几种ADO连接方式:ODBC DSN,ODBC DSN-Less, OLE DB PRovider,和"MS Remote" Provider.1,ODBC DSN连接I.DSNoConn.Open "DSN=AdvWorks;" & _ "UID=A
下面将简单介绍一下几种ADO连接方式:ODBC DSN,ODBC DSN-Less,
OLE DB PRovider,和"MS Remote" Provider.
1。ODBC DSN连接
I.DSN
  oConn.Open "DSN=AdvWorks;" & _
    "UID=Admin;" & _
    "PWD=;"
注意:从MDAC2.1开始就不能够在使用这样的方式了,就是只把DSN文件名放在ConnectString中
   你必须同时使用DSN,UID,PWD标志。例如下面的方式在MDAC 2.1中将会出错:
  oConn.Open "AdvWorks"



II.File DSN
  oConn.Open "FILEDSN=\somepath\mydb.dsn;" & _
    "UID=Admin;" & _
    "PWD=;"
III.ODBC DSN-Less Connections
a)ODBC Text Driver
  oConn.Open _
    "Driver={Microsoft Text Driver (*.txt; *.csv)};" & _
    "Dbq=\somepath\;" & _
    "Extensions=asc,csv,tab,txt;" & _
    "Persist Security Info=False"
注意:需要在SQL语句中指定使用到的文件名。例如:
  oRs.Open "Select * From customer.csv", _
    oConn, adOpenStatic, adLockReadOnly, adCmdText
b)ODBC Driver for access
  i)普通安全模式:
    oConn.Open _
      "Driver={Microsoft Access Driver (*.mdb)};" & _
      "Dbq=\somepath\mydb.mdb;" & _
      "Uid=Admin;" & _
      "Pwd=;"
  ii)如果使用了System database:
    oConn.Open _
      "Driver={Microsoft Access Driver (*.mdb)};" & _
      "Dbq=\somepath\mydb.mdb;" & _
      "SystemDB=\somepath\mydb.mdw;", _
      "admin", ""
c)ODBC Driver for SQL Server
  i)普通安全模式
    oConn.Open "Driver={SQL Server};" & _
      "Server=carl2;" & _
      "Database=pubs;" & _
      "Uid=sa;" & _
      "Pwd=;"
  ii)使用信任安全模式:
    oConn.Open "Driver={SQL Server};" & _
      "Server=carl2;" & _
      "Database=pubs;" & _
      "Uid=;" & _
      "Pwd=;"
  注意:要使用空白的Uid和Pwd     
d)ODBC Driver for Oracle
  i)使用现有的Oracle ODBC Driver from Microsoft:
    oConn.Open _
      "Driver={Microsoft ODBC for Oracle};" & _
      "Server=OracleServer.world;" & _
      "Uid=demo;" & _
      "Pwd=demo;"
  ii)使用老版本的Oracle ODBC Driver from Microsoft:
    oConn.Open _
      "Driver={Microsoft ODBC Driver for Oracle};" & _
      "ConnectString=OracleServer.world;" & _
      "Uid=demo;" & _
      "Pwd=demo;"
IIII)使用微软的OLE DB Data Link Connections方式Data Link File (UDL)
a)使用绝对路径
  oConn.Open "File Name=\somepath\pubs.udl;"
b)使用相对路径
  oConn.Open "File Name=pubs.udl;"
V)OLE DB Provider Connections方式
a)OLE DB Provider for ODBC Databases
  i)Access (Jet):
    oConn.Open _
      "Provider=MSDASQL;" & _
      "Driver={Microsoft Access Driver (*.mdb)};" & _
      "Dbq=\somepath\mydb.mdb;" & _
      "Uid=Admin;" & _
      "Pwd=;"
  ii)SQL Server:
    oConn.Open _
      "Provider=MSDASQL;" & _ 
      "Driver={SQL Server};" & _
      "Server=carl2;" & _
      "Database=pubs;" & _
      "Uid=sa;" & _
      "Pwd=;"
b)OLE DB Provider for Microsoft Jet (Access)
  i)普通安全模式:
    oConn.Open _
      "Provider=Microsoft.Jet.OLEDB.4.0;" & _
      "Data Source=\somepath\mydb.mdb;" & _
      "User Id=admin;" & _
      "PassWord=;"
  ii)如果使用了System database:
    oConn.Open _
      "Provider=Microsoft.Jet.OLEDB.4.0;" & _
      "Data Source=\somepath\mydb.mdb;" & _
      "Jet OLEDB:System Database=system.mdw;", _
      "admin", ""
  注意:当使用OLE DB Provider4.0版本是,需要把MDB和MDW文件转换成4.0的数据库格式
  iii)如果MDB需要一个数据库密码的话:
    oConn.Open _
      "Provider=Microsoft.Jet.OLEDB.4.0;" & _
      "Data Source=\somepath\mydb.mdb;" & _
      "Jet OLEDB:Database Password=MyDbPassword;", _
      "admin", ""
c)OLE DB Provider for Excel Spreadsheet:
    oConn.Open _
      "Provider=Microsoft.Jet.OLEDB.4.0;" & _
      "Data Source=\somepath\expenses.xls;" & _
      "Extended Properties=""Excel 8.0;HDR=Yes;"";"
  注意: "HDR=Yes"表示在第一行中是行标题,在provider中将不把第一行包括入recordset中
d)OLE DB Provider for SQL Server
  i)普通安全模式:
    oConn.Open "Provider=sqloledb;" & _
      "Network Library=DBMSSOCN;" & _
      "Data Source=carl2;" & _
      "Initial Catalog=pubs;" & _
      "User Id=sa;" & _
      "Password=;"
  ii)使用信任安全模式:
    oConn.Open "Provider=sqloledb;" & _
      Network Library=DBMSSOCN;" & _
      "Data Source=carl2;" & _
      "Initial Catalog=pubs;" & _
      "Trusted_Connection=yes;"
  注意:"Network Library=DBMSSOCN"声明OLE DB使用TCP/ip替代Named Pipes.
e)OLE DB Provider for Oracle
  oConn.Open "Provider=msdaora;" & _
    "Data Source=OracleServer.world;" & _
    "User Id=sa;" & _
    "Password=;"
(VI)Remote OLE DB Provider Connections方式(就是我一直在研究的RDS方式哦,呵呵。):
a)MS Remote - Access (Jet)
  i)ODBC DSN:
    oConn.Open "Remote Server=http://carl2;" & _
      "Remote Provider=MSDASQL;" & _
      "DSN=AdvWorks;" & _
      "Uid=admin" & _
      "Pwd=;"
  ii)OLE DB Provider:
    oConn.Open "Provider=MS Remote;" & _
      "Remote Server=http://carl2;" & _
      "Remote Provider=Microsoft.Jet.OLEDB.4.0;" & _
      "Data Source=\somepath\mydb.mdb;", _
      "admin", ""
  iii)OLE DB Provider自定义事务对象
    oConn.Open "Provider=MS Remote;" & _
      "Remote Server=http://carl2;" & _
      "Handler=MSDFMAP.Handler;" & _
      "Data Source=MyAdvworksOLEDBConnectTag;"
b)MS Remote - SQL Server
  i)ODBC DSN:
    oConn.Open "Remote Server=http://carl2;" & _
      "Remote Provider=MSDASQL;" & _
      "Network Library=DBMSSOCN;" & _
      "DSN=Pubs;" & _
      "Uid=sa" & _
      "Pwd=;"
  ii)OLE DB Provider
    oConn.Open "Provider=MS Remote;" & _
      "Remote Server=http://carl2;" & _
      "Remote Provider=SQLOLEDB;" & _
      "Network Library=DBMSSOCN;" & _
      "Data Source=carl2;" & _
      "Initial Catalog=pubs;" & _
      "User ID=sa;" & _
      "Password=;"

Tags:连接 数据库 查询

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