連接數據庫查詢手冊

2019-11-18 20:16:30

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下面將簡單介紹一下幾種ADO連接方式：ODBC DSN,ODBC DSN-Less,
OLE DB PRovider,和"MS Remote" Provider.
1。ODBC DSN連接
I.DSN
    oConn.Open "DSN=AdvWorks;" & _
        "UID=Admin;" & _
        "PWD=;"
注意：從MDAC2.1開始就不能夠在使用這樣的方式了，就是只把DSN文件名放在ConnectString中
      你必須同時使用DSN，UID，PWD標志。例如下面的方式在MDAC 2.1中將會出錯：
    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語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)使用現有的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)使用微軟的OLE DB Data Link Connections方式Data Link File (UDL)
a)使用絕對路徑
    oConn.Open "File Name=/somepath/pubs.udl;"
b)使用相對路徑
    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：當使用OLE DB Provider4.0版本是，需要把MDB和MDW文件轉換成4.0的數據庫格式
    iii)如果MDB需要一個數據庫密碼的話：
        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標題，在provider中將不把第一行包括入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"聲明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自定義事務對象
        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=;"

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