分享
 
 
 

Result Sets from Stored Procedures In Oracle

王朝oracle·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

Result Sets from Stored Procedures In Oracle

A frequently asked question is:

I'd like to know whether ORACLE supports procedures (functions) which

returns result sets.

The answer is most definitely yes. In short, it'll look like this:

create or replace function sp_ListEmp return types.cursortype

as

l_cursor types.cursorType;

begin

open l_cursor for select ename, empno from emp order by ename;

return l_cursor;

end;

/

With 7.2 on up of the database you have cursor variables. Cursor variables are cursors opened by a pl/sql routine and fetched from by another application or pl/sql routine (in 7.3 pl/sql routines can fetch from cursor variables as well as open them). The cursor variables are opened with the privelegs of the owner of the procedure and behave just like they were completely contained within the pl/sql routine. It uses the inputs to decide what database it will run a query on.

Here is an example:

create or replace package types

as

type cursorType is ref cursor;

end;

/ create or replace function sp_ListEmp return types.cursortype

as

l_cursor types.cursorType;

begin

open l_cursor for select ename, empno from emp order by ename; return l_cursor;

end;

/

examples for SQLPlus, Pro*C, Java/JDBC, ODBC, ADO/ASP, DBI Perl and OCI follow:

REM SQL*Plus commands to use a cursor variable variable c refcursor

exec :c := sp_ListEmp

print c

and the Pro*C to use this would look like:

static void process()

{

EXEC SQL BEGIN DECLARE SECTION;

SQL_CURSOR my_cursor;

VARCHAR ename[40];

int empno;

EXEC SQL END DECLARE SECTION; EXEC SQL WHENEVER SQLERROR DO sqlerror_hard(); EXEC SQL ALLOCATE :my_cursor; EXEC SQL EXECUTE BEGIN

:my_cursor := sp_listEmp;

END; END-EXEC; for( ;; )

{

EXEC SQL WHENEVER NOTFOUND DO break;

EXEC SQL FETCH :my_cursor INTO :ename, empno; printf( "'%.*s', %d\n", ename.len, ename.arr, empno );

}

EXEC SQL CLOSE :my_cursor;

}

And the java to use this could be:

import java.sql.*;

import java.io.*;

import oracle.jdbc.driver.*;

class curvar

{

public static void main (String args [])

throws SQLException, ClassNotFoundException

{

String driver_class = "oracle.jdbc.driver.OracleDriver";

String connect_string = "jdbc:oracle:thin:@slackdog:1521:oracle8"; String query = "begin :1 := sp_listEmp; end;";

Connection conn; Class.forName(driver_class);

conn = DriverManager.getConnection(connect_string, "scott", "tiger"); CallableStatement cstmt = conn.prepareCall(query);

cstmt.registerOutParameter(1,OracleTypes.CURSOR);

cstmt.execute();

ResultSet rset = (ResultSet)cstmt.getObject(1); while (rset.next ())

System.out.println( rset.getString (1) );

cstmt.close();

}

}

The following is thanks to marktoml@hotmail.com (mark tomlinson)..

If you use ODBC here is a working example, but it requires the use of the

8.0.5.2.0 or later Oracle ODBC driver, and an 8.0.5 server.

'

' 1) Create a form with 1 Text control (Text1) and 1 List Control (List1) and

' 1 Button (BTnExecute).

' 2) The only code that you need is a Click method on your button. Here is the Code.

'

'

Private Sub btnExecute_Click()

'PL/SQL Code

'===========

'

'CREATE OR REPLACE package reftest as

' cursor c1 is select ename from emp;

' type empCur is ref cursor return c1%ROWTYPE;

' Procedure GetEmpData(en in varchar2,EmpCursor in out empCur);

'END;

'

'

'CREATE OR REPLACE package body reftest as

' Procedure GetEmpData

'(en in varchar2,EmpCursor in out empCur) is

'begin

' open EmpCursor for select ename from emp where ename LIKE en;

'end;

'end;

'

Dim cn As New rdoConnection

Dim qd As rdoQuery

Dim rs As rdoResultset

Dim cl As rdoColumn

Static Number As Integer List1.Clear

Number = 0

cn.Connect = "uid=scott; pwd=tiger; DSN=MSLANGORL;"

'enable the MS Cursor library

cn.CursorDriver = rdUseOdbc

'Make the connection

cn.EstablishConnection rdNoDriverPrompt sSQL = "{call RefTest.GetEmpData(?,?)}" Set qd = cn.CreateQuery("", sSQL) qd.rdoParameters(0).Type = rdTypeVARCHAR

qd(0).Direction = rdParamInputOutput

qd(0).Value = Text1.Text

qd.rdoParameters(1).Type = rdTypeVARCHAR 'Dynamic or Keyset is meaningless here

Set rs = qd.OpenResultset(rdOpenStatic) Do

Debug.Print

Debug.Print Do Until rs.EOF

For Each cl In rs.rdoColumns

If IsNull(cl.Value) Then

List1.AddItem "(null)"

' Debug.Print " "; cl.Name; "NULL"; Error trap for

null fields

Else

List1.AddItem cl.Value

' Debug.Print " "; cl.Name; " "; cl.Value;

End If

Next

Debug.Print

rs.MoveNext

Loop

Loop While rs.MoreResults

cn.Close End Sub

And now, for a full ASP example (thanks to Jim Hoien and John Durst )

<%@ Language=VBScript %><!--#INCLUDE VIRTUAL="/ADOVBS.INC" --><% ' This demonstration draws heavily from the information contained in the article at ' http://govt.us.oracle.com/~tkyte/ResultSets/index.html ' with special attention to the details provided by Mark Tomlinson. ' Make sure you have the correct Oracle ODBC driver so it will support Ref Cursors. ' ' ' This demonstration was a joint project by Jim Hoien (jhoien@yahoo.com) and John Durst (jpdurst@yahoo.com) ' ' These are the statements used on the Oracle server: ' ' /*******************************************************************************************/ ' /* Create the EMP demo table and populate. (extracted from Oracle's provided demobld.sql) */ ' /*******************************************************************************************/ ' ' CREATE TABLE EMP ' (EMPNO NUMBER(4) NOT NULL, ' ENAME VARCHAR2(10), ' JOB VARCHAR2(9), ' MGR NUMBER(4), ' HIREDATE DATE, ' SAL NUMBER(7,2), ' COMM NUMBER(7,2), ' DEPTNO NUMBER(2)); ' ' INSERT INTO EMP VALUES ' (7369,'SMITH','CLERK',7902,'17-DEC-80',800,NULL,20); ' INSERT INTO EMP VALUES ' (7499,'ALLEN','SALESMAN',7698,'20-FEB-81',1600,300,30); ' INSERT INTO EMP VALUES ' (7521,'WARD','SALESMAN',7698,'22-FEB-81',1250,500,30); ' INSERT INTO EMP VALUES ' (7566,'JONES','MANAGER',7839,'2-APR-81',2975,NULL,20); ' INSERT INTO EMP VALUES ' (7654,'MARTIN','SALESMAN',7698,'28-SEP-81',1250,1400,30); ' INSERT INTO EMP VALUES ' (7698,'BLAKE','MANAGER',7839,'1-MAY-81',2850,NULL,30); ' INSERT INTO EMP VALUES ' (7782,'CLARK','MANAGER',7839,'9-JUN-81',2450,NULL,10); ' INSERT INTO EMP VALUES ' (7788,'SCOTT','ANALYST',7566,'09-DEC-82',3000,NULL,20); ' INSERT INTO EMP VALUES ' (7839,'KING','PRESIDENT',NULL,'17-NOV-81',5000,NULL,10); ' INSERT INTO EMP VALUES ' (7844,'TURNER','SALESMAN',7698,'8-SEP-81',1500,0,30); ' INSERT INTO EMP VALUES ' (7876,'ADAMS','CLERK',7788,'12-JAN-83',1100,NULL,20); ' INSERT INTO EMP VALUES ' (7900,'JAMES','CLERK',7698,'3-DEC-81',950,NULL,30); ' INSERT INTO EMP VALUES ' (7902,'FORD','ANALYST',7566,'3-DEC-81',3000,NULL,20); ' INSERT INTO EMP VALUES ' (7934,'MILLER','CLERK',7782,'23-JAN-82',1300,NULL,10); ' ' /*******************************************************************************************/ ' /* Create a packaged procedure that accepts a department number and returns the employees. */ ' /* [Note: A standalone procedure will not work, it must be a packaged procedure!] */ ' /*******************************************************************************************/ ' ' CREATE OR REPLACE ' PACKAGE DEPARTMENT AS ' TYPE CURSOR_TYPE IS REF CURSOR; ' PROCEDURE GET_EMPS (I_DEPTNO IN NUMBER, ' O_RESULT_SET OUT CURSOR_TYPE); ' END; ' / ' CREATE OR REPLACE ' PACKAGE BODY DEPARTMENT AS ' PROCEDURE GET_EMPS (I_DEPTNO IN NUMBER, ' O_RESULT_SET OUT CURSOR_TYPE) ' AS ' BEGIN ' OPEN O_RESULT_SET FOR ' SELECT EMPNO, ENAME ' FROM EMP ' WHERE DEPTNO = I_DEPTNO; ' END; ' END; ' /%><Html><HEAD> <TITLE>Oracle ADO Test</TITLE></HEAD><BODY><H2>Test of ADO and Oracle Stored Procedures using Ref Cursors</H2><% Dim objConn Dim connString Dim cmdStoredProc Dim param1 Dim testDeptNo testDeptNo = 10' testDeptNo = 20' testDeptNo = 30 set objConn = server.createobject("adodb.connection") ' System DSN connection ' Replace the values below with your own connString = "DSN=<YourDSN>;UID=<YourUserName>;PWD=<YourPassWord>" objConn.Open connString Set cmdStoredProc = Server.CreateObject ("ADODB.Command") Set cmdStoredProc.ActiveConnection = objConn cmdStoredProc.CommandText = "Department.Get_Emps" cmdStoredProc.CommandType = adCmdStoredProc Set param1 = cmdStoredProc.CreateParameter ("Dept_ID", adInteger, adParamInput) cmdStoredProc.Parameters.Append param1 param1.Value = testDeptNo Set rs = cmdStoredProc.Execute Response.Write ("<h3>Employees in Department # " & testDeptNo & "</h3>" & vbCrLf) Response.Write ("<p>" & vbCrLf) Response.Write ("<table>" & vbCrLf) Response.Write (" <tr>" & vbCrLf) Response.Write (" <th>Emp #</th>" & vbCrLf) Response.Write (" <th>Name</th>" & vbCrLf) Response.Write (" </tr>" & vbCrLf) While (Not rs.EOF) Response.Write (" <tr>" & vbCrLf) Response.Write (" <td>" & rs (0) & "</td>" & vbCrLf) Response.Write (" <td>" & rs (1) & "</td>" & vbCrLf) Response.Write (" </tr>" & vbCrLf) rs.MoveNext Wend Response.Write ("</table>" & vbCrLf) rs.Close objConn.Close Set rs = nothing Set param1 = nothing Set cmdStoredProc = nothing Set objConn = nothing%></BODY></HTML>

And the following is thanks to Brett Rosen :

I noticed that you didn't have an OCI entryon http://osi.oracle.com/~tkyte/ResultSets/index.html .Here is OCI code to do this (Oracle 81) if you want to include it onthat page.Some error checking and cleanup has been removed, but the below shouldwork. (once dbname has been replaced appropriately) Brettint main(int argc, char* argv[]){ OCIError* pOciError; char* pConnectChar = "dbname"; char* pUsernameChar = "scott"; char* pPasswordChar = "tiger"; int answer; OCIStmt* pOciStatement; char* sqlCharArray = "BEGIN :sUCcess := sp_ListEmp; END;"; int id; char ename[40]; OCIEnv* g_pOciEnvironment = NULL; OCIServer* g_pOciServer = NULL; OCISession* g_pOciSession = NULL; OCISvcCtx* g_pOciServiceContext = NULL; sb2* pIndicator=0; sb2* pIndicator2=0; sb2* pIndicator3=0; OCIDefine* pOciDefine; OCIDefine* pOciDefine2; OCIBind* pBind; OCIStmt* cursor; answer = OCIInitialize(OCI_THREADED, NULL, NULL, NULL, NULL); answer = OCIEnvInit(&g_pOciEnvironment, OCI_DEFAULT, 0, NULL); answer = OCIHandleAlloc(g_pOciEnvironment, (void **)&pOciError, OCI_HTYPE_ERROR, 0, NULL); answer = OCIHandleAlloc(g_pOciEnvironment, (void **)&g_pOciSession, OCI_HTYPE_SESSION, 0, NULL); answer = OCIHandleAlloc(g_pOciEnvironment, (void **)&g_pOciServer, OCI_HTYPE_SERVER, 0, NULL); answer = OCIHandleAlloc(g_pOciEnvironment, (void **)&g_pOciServiceContext, OCI_HTYPE_SVCCTX, 0, NULL); answer = OCIServerAttach(g_pOciServer, pOciError, (unsigned char *)pConnectChar, strlen(pConnectChar), OCI_DEFAULT); answer = OCIAttrSet(g_pOciSession, OCI_HTYPE_SESSION, (unsigned char *)pUsernameChar, strlen(pUsernameChar), OCI_ATTR_USERNAME, pOciError); answer = OCIAttrSet(g_pOciSession, OCI_HTYPE_SESSION, (unsigned char *)pPasswordChar, strlen(pPasswordChar), OCI_ATTR_PASSWORD, pOciError); answer = OCIAttrSet(g_pOciServiceContext, OCI_HTYPE_SVCCTX, g_pOciServer, 0, OCI_ATTR_SERVER, pOciError); answer = OCIAttrSet(g_pOciServiceContext, OCI_HTYPE_SVCCTX, g_pOciSession, 0, OCI_ATTR_SESSION, pOciError); answer = OCISessionBegin(g_pOciServiceContext, pOciError, g_pOciSession, OCI_CRED_RDBMS, OCI_DEFAULT); answer = OCIHandleAlloc(g_pOciEnvironment, (void **)(&pOciStatement), OCI_HTYPE_STMT, 0, NULL); answer = OCIStmtPrepare(pOciStatement, pOciError, (unsigned char *)sqlCharArray, strlen(sqlCharArray), OCI_NTV_SYNTAX, OCI_DEFAULT); answer = OCIHandleAlloc(g_pOciEnvironment, (void **)(&cursor), OCI_HTYPE_STMT, 0, NULL); answer = OCIBindByPos(pOciStatement,&pBind, pOciError, 1, &cursor, 0,SQLT_RSET, pIndicator2, 0,NULL, 0,0,OCI_DEFAULT); answer = OCIStmtExecute(g_pOciServiceContext, pOciStatement, pOciError, 1, 0, NULL, NULL, OCI_COMMIT_ON_SUCCESS); answer = OCIDefineByPos(cursor,&pOciDefine, pOciError,2,&id,sizeof(int), SQLT_INT,pIndicator, 0, 0,OCI_DEFAULT); answer = OCIDefineByPos(cursor,&pOciDefine2, pOciError,1,ename,40, SQLT_STR,pIndicator3, 0, 0,OCI_DEFAULT); if (answer == 0) while ((answer = OCIStmtFetch(cursor,pOciError, 1,OCI_FETCH_NEXT,OCI_DEFAULT)) == 0) { printf("fetched id %d and name %s\n",id,ename); } answer = OCIHandleFree(pOciError, OCI_HTYPE_ERROR); return 0;}

And the following DBI perl example is thanks to q_richard_chen@yahoo.com (Richard Chen):

Hello Tom, I was looking for such compilation of tipson the topic. I did not find the section about doingit using the popular perl DBI. After some fiddling Iget it working there too. Here is a complete workingexample following your model using perl DBI. I thinkit is a good idea that you include this in your howtoso that more people will benefit from it.ThanksRichard Chen$ cat demo.pl#!/usr/local/bin/perl -wuse strict;use DBI;use DBD::Oracle qw(:ora_types);my $dbh = DBI->connect('dbi:Oracle:','scott','tiger') or die $DBI::errstr;my $sth1 = $dbh->prepare(q{create or replace package types as type cursorType is ref cursor;end;});$sth1->execute;> >$sth1 = $dbh->prepare(q{create or replace function sp_ListEmp return types.cursorTypeas l_cursor types.cursorType;begin open l_cursor for select ename, empno from emp order by ename; return l_cursor;end;});$sth1->execute;$sth1 = $dbh->prepare(q{BEGIN :cursor := sp_ListEmp;END;});my $sth2;$sth1->bind_param_inout(":cursor", \$sth2, 0, { ora_type => ORA_RSET } );$sth1->execute();while ( my @row = $sth2->fetchrow_array ) { print join("",@row),"\n"; }

MFC + ODBC VERSION (example checked by Marcin Buchwald) marcin.buchwald@gazeta.pl Oracle server side code is just like in the VB example

CDatabase m_DB; BOOL ok = m_DB.OpenEx(_T("DSN=orcl;UID=velvet"),CDatabase::useCursorLib); COraSet set(&m_DB); set.m_Value = Text1.Text; set.Open(); while (!set.IsEOF()) { // set members contain values of single row // use it here set.MoveNext(); } set.Close();where COraSet::COraSet(CDatabase* pdb) : CRecordset(pdb) { m_nParams = 1; m_nFields = ; m_nDefaultType = snapshot; } CString COraSet::GetDefaultSQL() { return _T("{call RefTest.GetEmpData(?,?)}"); }

 
 
 
免责声明:本文为网络用户发布,其观点仅代表作者个人观点,与本站无关,本站仅提供信息存储服务。文中陈述内容未经本站证实,其真实性、完整性、及时性本站不作任何保证或承诺,请读者仅作参考,并请自行核实相关内容。
2023年上半年GDP全球前十五强
 百态   2023-10-24
美众议院议长启动对拜登的弹劾调查
 百态   2023-09-13
上海、济南、武汉等多地出现不明坠落物
 探索   2023-09-06
印度或要将国名改为“巴拉特”
 百态   2023-09-06
男子为女友送行,买票不登机被捕
 百态   2023-08-20
手机地震预警功能怎么开?
 干货   2023-08-06
女子4年卖2套房花700多万做美容:不但没变美脸,面部还出现变形
 百态   2023-08-04
住户一楼被水淹 还冲来8头猪
 百态   2023-07-31
女子体内爬出大量瓜子状活虫
 百态   2023-07-25
地球连续35年收到神秘规律性信号,网友:不要回答!
 探索   2023-07-21
全球镓价格本周大涨27%
 探索   2023-07-09
钱都流向了那些不缺钱的人,苦都留给了能吃苦的人
 探索   2023-07-02
倩女手游刀客魅者强控制(强混乱强眩晕强睡眠)和对应控制抗性的关系
 百态   2020-08-20
美国5月9日最新疫情:美国确诊人数突破131万
 百态   2020-05-09
荷兰政府宣布将集体辞职
 干货   2020-04-30
倩女幽魂手游师徒任务情义春秋猜成语答案逍遥观:鹏程万里
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案神机营:射石饮羽
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案昆仑山:拔刀相助
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案天工阁:鬼斧神工
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案丝路古道:单枪匹马
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案镇郊荒野:与虎谋皮
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案镇郊荒野:李代桃僵
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案镇郊荒野:指鹿为马
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案金陵:小鸟依人
 干货   2019-11-12
倩女幽魂手游师徒任务情义春秋猜成语答案金陵:千金买邻
 干货   2019-11-12
 
推荐阅读
 
 
 
>>返回首頁<<
 
靜靜地坐在廢墟上,四周的荒凉一望無際,忽然覺得,淒涼也很美
© 2005- 王朝網路 版權所有