如何使用ADO访问Oracle数据库存储过程

  • 来源: 互联网 作者: rocket   2008-03-19/14:30
  • ---- 一、关于ADO

    ---- 在基于Client/Server结构的数据库环境中,通过OLE DB接口可以存取数据,但它定义的是低层COM接口,不仅不易使用,而且不能被VB,VBA,VBScript等高级编程工具访问。而使用ADO则可以很容易地使VB等编程语言直接访问数据(通过OLE DB接口)。ADO是基于面向对象方法的,其对象模型如下图所示(略)

    ---- 由上图可见,ADO对象模型总共才包括六个对象,相对于数据访问对象(DAO)来说简单得多。因此实际中常常使用它来访问数据库。

    ---- 二、ADO访问数据库实例

    ---- 下面,我们以Oracle为例,使用VB6.0来访问其数据库中的存储过程。在此例中,我们首先在Oracle数据库上创建有两个存储过程,一个不带参数,另一个带有参数。然后,使用ADO来访问这两个存储过程。步骤如下:

    ---- 1. 在Oracle服务器上运行以下DDL脚本: 
    DROP TABLE person;
    CREATE TABLE person
    (ssn NUMBER(9) PRIMARY KEY,
    fname VARCHAR2(15),
    lname VARCHAR2(20));
    INSERT INTO person VALUES(555662222,'Sam','Goodwin');
    INSERT INTO person VALUES(555882222,'Kent','Clark');
    INSERT INTO person VALUES(666223333,'Jane','Doe');
    COMMIT;
    /

    ---- 2. 在Oracle服务器上创建包(package):
    CREATE OR REPLACE PACKAGE packperson
    AS
    TYPE tssn is TABLE of NUMBER(10)
    INDEX BY BINARY_INTEGER;
    TYPE tfname is TABLE of VARCHAR2(15)
    INDEX BY BINARY_INTEGER;
    TYPE tlname is TABLE of VARCHAR2(20)
    INDEX BY BINARY_INTEGER;

    PROCEDURE allperson
    (ssn OUT tssn,
    fname OUT tfname,
    lname OUT tlname);
    PROCEDURE oneperson
    (onessn IN NUMBER,
    ssn OUT tssn,
    fname OUT tfname,
    lname OUT tlname);
    END packperson;
    /

    ---- 3. 在Oracle服务器上创建以下包体(package body):

    CREATE OR REPLACE PACKAGE BODY packperson
    AS
    PROCEDURE allperson
    (ssn OUT tssn,
    fname OUT tfname,
    lname OUT tlname)
    IS
    CURSOR person_cur IS
    SELECT ssn, fname, lname
    FROM person;
    percount NUMBER DEFAULT 1;
    BEGIN
    FOR singleperson IN person_cur
    LOOP
    ssn(percount) := singleperson.ssn;
    fname(percount) := singleperson.fname;
    lname(percount) := singleperson.lname;
    percount := percount + 1;
    END LOOP;
    END;
    PROCEDURE oneperson
    (onessn IN NUMBER,
    ssn OUT tssn,
    fname OUT tfname,
    lname OUT tlname)
    IS
    CURSOR person_cur IS
    SELECT ssn, fname, lname
    FROM person
    WHERE ssn = onessn;
    percount NUMBER DEFAULT 1;
    BEGIN
    FOR singleperson IN person_cur
    LOOP
    ssn(percount) := singleperson.ssn;
    fname(percount) := singleperson.fname;
    lname(percount) := singleperson.lname;
    percount := percount + 1;
    END LOOP;
    END;
    END;
    /

    ---- 4. 在 VB 6.0 中打开一个新的工程,缺省创建表单 Form1。
    ---- 5. 在表单上添加二个按钮,cmdGetEveryone和cmdGetOne。

    ---- 6. 在代码窗口中添加以下代码:

    Option Explicit
    Dim Cn As ADODB.Connection
    Dim CPw1 As ADODB.Command
    Dim CPw2 As ADODB.Command
    Dim Rs As ADODB.Recordset
    Dim Conn As String
    Dim QSQL As String
    Dim inputssn As Long

    Private Sub cmdGetEveryone_Click()
    Set Rs.Source = CPw1
    Rs.Open
    While Not Rs.EOF
    MsgBox "Person data: " & Rs(0) & ",
    " & Rs(1) & ", " & Rs(2)
    Rs.MoveNext
    Wend
    Rs.Close
    End Sub

    Private Sub cmdGetOne_Click()
    Set Rs.Source = CPw2
    inputssn = InputBox(
    "Enter the SSN you wish to retrieve:")
    CPw2(0) = inputssn
    Rs.Open
    MsgBox "Person data: " & Rs(0) & " bbs.bitsCN.com
    , " & Rs(1) & ", " & Rs(2)
    Rs.Close
    End Sub

    Private Sub Form_Load()
    '使用合适的值代替以下用户ID,
    口令(PWD)和服务器名称(SERVER)
    Conn = "UID=*****;PWD=*****;driver=" _
    & "{Microsoft ODBC for
    Oracle};SERVER=dseOracle;"
    Set Cn = New ADODB.Connection
    '创建Connection对象
    With Cn
    .ConnectionString = Conn
    .CursorLocation = adUseClient
    .Open
    End With
    QSQL = "{call packperson.allperson(
    {resultset 9,ssn,fname,"_
    & "lname})}"
    Set CPw1 = New ADODB.Command
    '创建Command对象
    With CPw1
    Set .ActiveConnection = Cn
    .CommandText = QSQL
    .CommandType = adCmdText
    End With
    QSQL ="{call packperson.oneperson(?,
    {resultset 2,ssn, "_
    & " fname,lname})}"
    '调用存储过程
    Set CPw2 = New ADODB.Command
    With CPw2
    Set .ActiveConnection = Cn
    .CommandText = QSQL
    .CommandType = adCmdText
     

    .Parameters.Append.CreateParameter(
    ,adInteger, _
    adParamInput)
    '添加存储过程参数
    End With
    Set Rs = New ADODB.Recordset
    With Rs
    .CursorType = adOpenStatic
    .LockType = adLockReadOnly
    End With
    End Sub

    Private Sub Form_Unload(Cancel As Integer)
    Cn.Close
    Set Cn = Nothing
    Set CPw1 = Nothing
    Set CPw2 = Nothing
    Set Rs = Nothing
    End Sub

    ---- 7. 运行程序。当点下cmdGetEveryone按钮时,程序调用Oracle数据库中不带参数的存储过程packperson.allperson,点下cmdGetOne按钮时调用packperson.oneperson存储过程。


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