Dynamic SQL with a Ref Cursor
HelloI have a package that returns a Ref Cursor, in this procedure, I have a dynamic sql code that is built according to certain values, and the query is a select query, is it possible that I can put that dynamic sql in the ref cursor and return of the procedure.
Or y at - it no alternative better workaround.
Thanks in advance.
Naveen
Yes you can.
Try this...
create or replace package test_pack is
type ref_cur is ref cursor;
procedure just_print(ref_var ref_cur);
end;
/
create or replace package body test_pack is
procedure just_print(ref_var ref_cur) is
l_var emp%rowtype;
begin
loop
fetch ref_var into l_var;
exit when ref_var%notfound;
dbms_output.put_line(l_var.ename);
end loop;
end;
end;
/
declare
cur_var test_pack.ref_cur;
dsql varchar2(100);
begin
dsql := 'select * from emp where deptno=10';
open cur_var for dsql;
test_pack.just_print(cur_var);
end;
/
CLARK
KING
MILLER
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.00
Kind regards
Prazy
Tags: Database
Similar Questions
-
Dynamic SQL with dynamic identifiers
Oracle 10gXE
I have a table that is used to track student attendance. If the student is present on a given day, a record is inserted with the student ID and the date they frequented.
presence of DESC
Name of Type Null
--------------- -------- ------
ID NOT NULL NUMBER
NUMBER OF STUDENT_ID
SITE_ID NUMBER
DATE OF ATTENDANCE_DATE
I want to view a report (in TOP) which shows all students for a given site, the days when school was in session for this month (not Saturday, Sunday) and a X for the student who participated in that day or a null value if they do not have.
ID # FNAME LNAME 3 4 5 6 7 10
38754636 POE JANE X X X
81248754 DOE KAYLA X X X X X
43127409 RAO JOHN X X X X X
In this example, days 3 and 7 of the month are from Monday to Friday and 8-9 have been excluded because they are on Saturday and Sunday.
I am trying to find a way to dynamically generate a query for any month/year and returning to a report. The obstacle is that given that I don't know in advance which days in a month will be excluded, the identifiers in my select statement are not fixed.
I found a query that returns a list of day numbers and dates for a given month. It looks like this:
SELECT LEVEL lv, TO_DATE (TO_CHAR (LEVEL, '09')
|| TO_CHAR (EXTRACT (TO_DATE('01-SEP-11') MONTHS), '09')
|| To_char (EXTRACT (TO_DATE('01-SEP-11') YEAR), ' 9999'), 'dd.mm.yyyy') mon_day
OF double WHERE ROWNUM < = EXTRACT (DAY OF LAST_DAY (TO_DATE('01-SEP-11')))
CONNECT BY LEVEL = ROWNUM
I combined this request with another brings my student attendance data and results that pivots in what I need. Then, I created a function that accepts the month and year as parameters and creates the combined request.
SELECT c.ID student_id, c.last_name, c.first_name,.
MAX (decode (mon_day, ' 01 - SEPT.-11', 'X', NULL)) '1', MAX (decode (mon_day, ' 02 - SEVEN.-11', 'X', NULL)) '2 ',.
MAX (decode (mon_day, ' 05 - SEPT.-11', 'X', NULL)) '5', MAX (decode (mon_day, ' 06 - SEPT.-11', 'X', NULL)) "6."
MAX (decode (mon_day, ' 07-SEP-11', 'X', NULL)) '7', MAX (decode (mon_day, ' 08 - SEPT.-11', 'X', NULL)) "8."
MAX (decode (mon_day, ' 09 - SEPT.-11', 'X', NULL)) '9', MAX (decode (mon_day, 12-SEP-11', 'X', NULL)) "12."
MAX (decode (mon_day, 13-SEP-11', 'X', NULL)) '13', MAX (decode (mon_day, 14-SEPT-11', 'X', NULL)) "14."
MAX (decode (mon_day, 15-SEP-11', 'X', NULL)) '15', MAX (decode (mon_day, 16-SEP-11', 'X', NULL)) "16."
MAX (decode (mon_day, 19-SEP-11', 'X', NULL)) '19', MAX (decode (mon_day, 20-7.-11', 'X', NULL)) "20."
MAX (decode (mon_day, 21-SEP-11', 'X', NULL)) "21", MAX (decode (mon_day, 22-SEP-11', 'X', NULL)) '22 ',.
MAX (decode (mon_day, 23-SEP-11', 'X', NULL)) '23', MAX (decode (mon_day, 26-SEP-11', 'X', NULL)) "26."
MAX (decode (mon_day, 27-SEP-11', 'X', NULL)) '27', MAX (decode (mon_day, 28-SEP-11', 'X', NULL)) "28."
MAX (decode (mon_day, 29-SEP-11', 'X', NULL)) '29', MAX (decode (mon_day, 30-SEP-11', 'X', NULL)) '30 '.
(SELECT level lv, TO_DATE (TO_CHAR (LEVEL, '09')
|| TO_CHAR (EXTRACT (TO_DATE('01-SEP-11') MONTHS), '09')
|| To_char (EXTRACT (TO_DATE('01-SEP-11') YEAR), ' 9999'), 'dd.mm.yyyy') mon_day
OF double WHERE ROWNUM < = EXTRACT (DAY OF LAST_DAY (TO_DATE('01-SEP-11')))
CONNECTION LEVEL = ROWNUM) a, b of attendance, student c
WHERE to_char(MON_DAY,'D') NOT IN (1.7)
AND A.mon_day = b.attendance_date
AND b.student_id = c.ID
Group of c.ID, student_id, c.last_name, c.first_name
Now I'm stuck on what I can pass this request in to get my result. What I've read, dynamic SQL method 4 would work if I incorporate Pro/C. I hope this isn't my only option. I have considered to try to do this in a function table in pipeline, but since the columns returned are not known in advance, I can't create a corresponding data type.
I'm starting to wonder if I forgot a simpler method to achieve this.
Published by: David Sumner on April 12, 2012 18:52Ignoring the actual query and looking at the dynamic SQL part of the question.
There are 3 ways to run a dynamic select SQL in PL/SQL code.
immediate execution requires a fixed number of bind variables, linking him in position and translates a single implicit output cursor extraction - requiring the projection of cursor to be known at the time of coding.
REF CURSOR are essentially the same - the only exception being that it requires an extraction explicit coding process output cursor.
DBMS_SQL differs in all of these respects. The connection is by name and not position. The connection is dynamic. Projection of the cursor must not be known at the time of coding. It is dynamically determined at runtime and fetch offers of release of the cursor with the projection of unknown SQL - coding time.
Apex uses DBMS_SQL internally (in fact he uses DBMS_SYS_SQL properly run dynamic and specific patterns of Oracle SQL, as if a session connected as a scheme runs the SQL code). This allows the Apex to take a dynamic SQL that you enter a region (which can contain a variable number of bind variable), run it and make the projection of the cursor as an HTML report.
Apex supports in turn also dynamic SQL - what you (Apex developer) to provide a dynamic SQL code for a region, instead of you having to provide SQL fixed (with bind variable) for the region in question.
As Apex creates DBMS_SQL sliders, it doesn't have your SQL as a ref cursor or cursor DBMS_SQL. All they need is the source of the SQL statement. And that's what you create dynamically.
So in the Apex, dynamic SQL means using a function from PL/SQL to return the source for Apex SQL analyze like a slider DBMS_SQL - instead of coding the source SQL statement in a fixed statement.
So, using the option of function for an area considered in the Apex, allows you to provide the following in the code that must run to get the SQL statement for the report Apex (Apex running this as a dynamic function that returns a string):
--// return the dynamic SQL for the report region return( case when :P1_OPTION = 1 then 'select * from emp' when :P1_OPTION = 2 then 'select * from dept where dept_id = :P1_DEPT_ID' end );You can also write a PL/SQL function that is stored in the database and call this function so that it can determine what is the dynamic SQL source code statement. For example
--// calling database function to return the dynamic SQL for the report region return( GetDynamicReportSQL( page => 1, option => :P1_OPTION ) );Dynamic SQL is fully supported by Apex - but does not require that you, the developer, to create the dynamic cursor and treat the dynamic linking and dynamic recovery of this slider.
All you have to do is to provide the source code of this dynamic SQL (including the bind variable) to the Apex and it will do the whole thing from cursor for you.
-
How to call a stored procedure with a REF CURSOR output parameter
I'm looking forward to example calling a function/stored procedure with a REF CURSOR output parameter and get the result.
In other words, I have a stored function/procedure that runs a SELECT statement using the OCI library and then he could get the values of each row and each column.
I put a code snippet, it have only the main thing to call a simple stored procedure and to print the name of each column of the cursor, but I couldn t to print out values in the table that calls the stored procedure.
I understand that the next step is to call an OCIStmtFetch.
How to associate the slider with the OCIStmtFetch?
If you need more information, just tell me.
I use ANSI C with HP - UX (HP - UX C) operating system and Oracle 10 g.
Kind regards.
Antonio Garcia
/ * callOracleSP * /.
#include < stdio.h >
#include < string.h >
#include < oci.h >
#include < stdlib.h > to
char * pConnectChar = "Server";
char * pUsernameChar = "user";
char * pPasswordChar = "passwd";
char * sqlCharArray1 = "BEGIN SP_GETCITIES (:,: c); END; « ;
int retval;
UB4 parmcnt = 0;
UB4 pos2 = 0;
text * pcoln [20];
UB4 namelen [20];
char state_key [5];
OCIStmt * pOciStatement;
OCIStmt * pOciStatCursor;
OCIError * pOciError;
OCIEnv * pOciEnviron;
OCIServer * pOciServer;
OCISession * pOciSession;
OCISvcCtx * pOciServiceContext;
OCIBind * pOciBind [500];
OCIParam * pOciParam;
int main()
{
retval = OCIEnvCreate (& pOciEnviron, OCI_DEFAULT, NULL, NULL, NULL, NULL, 0, NULL);
retval = OCIEnvInit (& pOciEnviron, OCI_DEFAULT, 0, NULL);
retval = OCIHandleAlloc (pOciEnviron, (void *) & pOciError, OCI_HTYPE_ERROR, 0, NULL);
retval = OCIHandleAlloc (pOciEnviron, (void *) & pOciServiceContext, OCI_HTYPE_SVCCTX, 0, NULL);
retval = OCIHandleAlloc (pOciEnviron, (void *) & pOciStatement, OCI_HTYPE_STMT, 0, NULL);
retval = OCILogon (pOciEnviron, pOciError, & pOciServiceContext,(unsigned char *) pUsernameChar,
strlen (pUsernameChar), (unsigned char *) pPasswordChar, strlen (pPasswordChar).
(unsigned char *) pConnectChar, strlen (pConnectChar));
printf ("retval=%d\n",retval OCILogon);
retval = OCIStmtPrepare (pOciStatement, pOciError, (unsigned char *) sqlCharArray1, strlen (sqlCharArray1),)
OCI_NTV_SYNTAX, OCI_DEFAULT);
printf ("StmtPrepare retval=%d\n",retval);
retval = OCIHandleAlloc (pOciEnviron, (void *) & pOciStatCursor, OCI_HTYPE_STMT, 0, NULL);
retval = 1 OCIBindByPos(pOciStatement,&pOciBind[0], pOciError, (ub4), (void *) & state_key,)
((sb4) sizeof (state_key), SQLT_STR, (void *) 0, (ub2 *) 0, (ub2 *) 0, (ub4) 0, (ub4 *) 0, OCI_DEFAULT (ub4));
printf ("BindByPos OCI_HTYPE_STMT retval=%d\n",retval);
retval = OCIBindByPos(pOciStatement,&pOciBind[1], pOciError, (ub4) 2, (void *) & pOciStatCursor,)
((sb4) 0, SQLT_RSET, (void *) 0, (ub2 *) 0, (ub2 *) 0, (ub4) 0, (ub4 *) 0, OCI_DEFAULT (ub4));
printf ("BindByPos OCI_HTYPE_STMT retval=%d\n",retval);
strcpy (state_key, 'ca');
retval = OCIStmtExecute (pOciServiceContext, pOciStatement, pOciError, (ub4) 1, (ub4) 0,)
(OCISnapshot *) NULL, (OCISnapshot *) NULL, OCI_DEFAULT (ub4));
printf ("StmtExecute retval=%d\n",retval);
/ * How to get the values of the cursor? */
/ * Number of parameters of the cursor * /.
OCIAttrGet ((void *) pOciStatCursor, OCI_HTYPE_STMT (ub4), (void *) & parmcnt,(ub4 *) 0,)
(ub4) (OCI_ATTR_PARAM_COUNT, pOciError);
printf ("\nNumber of the slider settings = %d\n",parmcnt);
for (int pos = 1; pos < = (int) parmcnt; pos ++)
{
OCIAttrGet ((void *) pOciStatCursor, OCI_HTYPE_STMT (ub4), (void *) & pos2,(ub4 *) 0,)
(ub4) (OCI_ATTR_CURRENT_POSITION, pOciError);
retval = OCIParamGet ((void *) pOciStatCursor, OCI_HTYPE_STMT (ub4), pOciError, (void *) & pOciParam,)
POS (ub4));
OCIAttrGet pOciParam, (ub4) ((void*) OCI_DTYPE_PARAM,(void*) & pcoln [pos - 1],(ub4 *) & namelen [pos-1],)
(ub4) OCI_ATTR_NAME,(OCIError *) pOciError);
}
for (int i = 1; i < = (int) parmcnt; i ++)
printf ("%i\tNAME = % column. ("* s\n", i, namelen [i-1], pcoln [i-1]);
return 0;
}
This is the script that create the table, insert records and create the stored procedure
CREATE TABLE CITIES)
STATE_CODE VARCHAR2 (2) NULL,
CITY_CODE NUMBER (15.5) NULL,
CITY_NAME VARCHAR2 (30) NULL
)
/
INSERT INTO CITIES (STATE_CODE, CITY_CODE, CITY_NAME)
VALUES ('CA', 30, 'SAN DIEGO')
/
INSERT INTO CITIES (STATE_CODE, CITY_CODE, CITY_NAME)
VALUES ('CA', 40 'SACRAMENTO')
/
INSERT INTO CITIES (STATE_CODE, CITY_CODE, CITY_NAME)
VALUES ('FL', 10, 'MIAMI')
/
INSERT INTO CITIES (STATE_CODE, CITY_CODE, CITY_NAME)
VALUES ('FL', 20, 'ORLANDO')
/
INSERT INTO CITIES (STATE_CODE, CITY_CODE, CITY_NAME)
VALUES ('NEW YORK', 10, 'NEW YORK')
/
INSERT INTO CITIES (STATE_CODE, CITY_CODE, CITY_NAME)
VALUES ('NEW YORK', 20, 'ALBANY')
/
INSERT INTO CITIES (STATE_CODE, CITY_CODE, CITY_NAME)
VALUES ('CA', 10, 'LOS ANGELES')
/
INSERT INTO CITIES (STATE_CODE, CITY_CODE, CITY_NAME)
VALUES ('CA', 20, 'SAN FRANCISCO')
/
CREATE or REPLACE PACKAGE globalPkg AUTHID CURRENT_USER AS
/ * The following is specific global variables T/SQL. */
TYPE RCT1 IS REF CURSOR; / * new cursor low definition * /.
END globalPkg;
/
CREATE OR REPLACE PROCEDURE SP_ADDCITY)
P_STATE_CODE IN VARCHAR,
P_CITY_CODE NUMBER,
P_CITY_NAME IN VARCHAR2,
P_RETURN IN NUMBERS)
AS
StoO_error INTEGER;
StoO_selcnt INTEGER;
StoO_rowcnt INTEGER;
StoO_errmsg VARCHAR2 (255);
BEGIN
StoO_rowcnt: = 0;
StoO_error: = 0;
StoO_selcnt: = 0;
P_RETURN: = 0;
INSERT INTO CITIES (STATE_CODE, CITY_CODE, CITY_NAME)
VALUES (P_STATE_CODE, P_CITY_CODE, P_CITY_NAME);
StoO_rowcnt: = number of LINES SQL %;
EXCEPTION
WHEN TOO_MANY_ROWS THEN
StoO_rowcnt: = 2;
WHILE OTHERS THEN
StoO_rowcnt: = 0;
StoO_selcnt: = 0;
StoO_error: = SQLCODE;
StoO_errmsg: = SQLERRM;
IF StoO_error! = 0 THEN
BEGIN
P_RETURN: = 1;
RETURN;
END;
END IF;
END;
/
CREATE OR REPLACE PROCEDURE SP_GETCITIES)
STATE_KEY IN VARCHAR,
RC1 IN OUT globalPkg.RCT1)
AS
StoO_error INTEGER;
StoO_selcnt INTEGER;
StoO_rowcnt INTEGER;
StoO_errmsg VARCHAR2 (255);
BEGIN
StoO_rowcnt: = 0;
StoO_error: = 0;
StoO_selcnt: = 0;
OPEN FOR RC1
SELECT STATE_CODE, CITY_CODE, FRANCISCO
CITIES
WHERE STATE_CODE = STATE_KEY
ORDER BY CITY_CODE;
StoO_rowcnt: = number of LINES SQL %;
EXCEPTION
WHILE OTHERS THEN
StoO_rowcnt: = 0;
StoO_error: = SQLCODE;
StoO_errmsg: = SQLERRM;
END;
/Hi Antonio,.
I see this:
c_buf=(ub1 **)calloc(sizeof(ub1 *),3); ... rc=OCIDefineByPos(pOciStatCursor,&pdef,(OCIError *)pOciError,pos,c_buf[pos-1],size+1,(ub2)type,(dvoid *)c_indp[pos-1],(ub2 *)0,(ub2 *)0,OCI_DEFAULT);That I don't understand. You allocate space for 3 pointers ub1 but I don't see where these pointers are then initialized to point to where the data is to be stored.
I do not read correctly?
Sorry for posting code long, but here is an example of code that I have. It is much more 'code' for your code, but maybe that will be enough...
NOTE: This is just the code example and not rigorous. For example, I don't check the memory, allocations etc in this code!
Kind regards
Mark
#ifdef WIN32 #define _CRT_SECURE_NO_DEPRECATE 1 #endif #include#include #include #include void checkerr(sword status, OCIError *errhp); int main(int argc, char *argv[]) { OCIEnv *envhp = NULL; /* OCI Environment handle */ OCIError *errhp = NULL; /* OCI Error handle */ OCISvcCtx *svchp = NULL; /* OCI Service Context handle */ OCIServer *srvhp = NULL; /* OCI Server handle */ OCISession *usrhp = NULL; /* OCI User Session handle */ OCIStmt *stmtp = NULL; /* OCI Statement handle */ OCIStmt *cursr = NULL; /* OCI Statement handle */ OCIParam *prmp1 = NULL; /* OCI Parameter handle */ OCIParam *prmp2 = NULL; /* OCI Parameter handle */ OCIParam *prmp3 = NULL; /* OCI Parameter handle */ OCIDefine *defp1 = NULL; /* OCI Define handle */ OCIDefine *defp2 = NULL; /* OCI Define handle */ OCIDefine *defp3 = NULL; /* OCI Define handle */ OCIBind *bndp1 = NULL; /* OCI Bind handle */ OCIBind *bndp2 = NULL; /* OCI Bind handle */ OCIBind *bndp3 = NULL; /* OCI Bind handle */ /* used to hold column width */ ub2 col_width; /* used to set the prefetch count */ ub4 prefetch_count = 32; /* will hold output from database */ oratext *pEmpId = NULL; oratext *pFirstName = NULL; oratext *pLastName = NULL; /* the anonymous block to execute */ /* this opens a ref cursor */ oratext *sqlstmt = "begin " \ " open :1 for " \ " select to_char(employee_id), " \ " first_name, " \ " last_name " \ " from hr.employees " \ " order by last_name, " \ " first_name; " \ "end;"; /* used to hold the results of each OCI call */ sword result = 0; /* Initialize and create a default environment */ result = OCIEnvCreate(&envhp, OCI_DEFAULT, (dvoid *) 0, 0, 0, 0, (size_t) 0, (dvoid **) 0); /* allocate an error handle */ result = OCIHandleAlloc((dvoid *) envhp, (dvoid **) &errhp, OCI_HTYPE_ERROR, 0, (dvoid **) 0); /* allocate a service context handle */ result = OCIHandleAlloc((dvoid *) envhp, (dvoid **) &svchp, OCI_HTYPE_SVCCTX, 0, (dvoid **) 0); /* allocate a server handle */ result = OCIHandleAlloc((dvoid *) envhp, (dvoid **) &srvhp, OCI_HTYPE_SERVER, 0, (dvoid **) 0); /* allocate a user session handle */ result = OCIHandleAlloc((dvoid *) envhp, (dvoid **) &usrhp, OCI_HTYPE_SESSION, 0, (dvoid **) 0); /* create a server context using the "ORADEMO" database */ result = OCIServerAttach(srvhp, errhp, "ORADEMO", (ub4) strlen("ORADEMO"), OCI_DEFAULT); /* set the server attribute in the service context handle */ result = OCIAttrSet((dvoid *) svchp, OCI_HTYPE_SVCCTX, (dvoid *) srvhp, (ub4) 0, OCI_ATTR_SERVER, errhp); /* open the session with the database */ /* using external authentication */ result = OCISessionBegin(svchp, errhp, usrhp, OCI_CRED_EXT, OCI_DEFAULT); /* set the user session attribute in the service context handle */ result = OCIAttrSet((dvoid *) svchp, OCI_HTYPE_SVCCTX, (dvoid *) usrhp, (ub4) 0, OCI_ATTR_SESSION, errhp); /* allocate the statement handle */ result = OCIHandleAlloc((dvoid *) envhp, (dvoid **) &stmtp, OCI_HTYPE_STMT, 0, (dvoid **) 0); /* prepare the statement for execution */ result = OCIStmtPrepare(stmtp, errhp, sqlstmt, (ub4) strlen((char *) sqlstmt), OCI_NTV_SYNTAX, OCI_DEFAULT); /* allocate the handle for the ref cursor */ result = OCIHandleAlloc((dvoid *) envhp, (void **) &cursr, OCI_HTYPE_STMT, 0, NULL); /* bind the ref cursor parameter */ result = OCIBindByPos(stmtp, &bndp1, errhp, 1, &cursr, 0, SQLT_RSET, NULL, 0, NULL, 0, 0, OCI_DEFAULT); /* execute the statement */ result = OCIStmtExecute(svchp, stmtp, errhp, 1, 0, NULL, NULL, OCI_DEFAULT); /* get parameter descriptor for first column */ result = OCIParamGet((dvoid *) cursr, OCI_HTYPE_STMT, errhp, (dvoid **) &prmp1, (ub4) 1); /* get parameter descriptor for second column */ result = OCIParamGet((dvoid *) cursr, OCI_HTYPE_STMT, errhp, (dvoid **) &prmp2, (ub4) 2); /* get parameter descriptor for third column */ result = OCIParamGet((dvoid *) cursr, OCI_HTYPE_STMT, errhp, (dvoid **) &prmp3, (ub4) 3); /* get the first column width in characters */ result = OCIAttrGet((dvoid*) prmp1, (ub4) OCI_DTYPE_PARAM, (dvoid*) &col_width, (ub4 *) 0, (ub4) OCI_ATTR_DATA_SIZE, errhp); /* allocate memory to hold the result */ pEmpId = (oratext *) malloc(sizeof(oratext) * (col_width + 1)); /* define the first column in the results */ result = OCIDefineByPos(cursr, &defp1, errhp, 1, (dvoid *) pEmpId, (sword) col_width + 1, SQLT_STR, (dvoid *) NULL, (ub2 *) 0, (ub2 *) 0, OCI_DEFAULT); /* get the second column width in characters */ result = OCIAttrGet((dvoid*) prmp2, (ub4) OCI_DTYPE_PARAM, (dvoid*) &col_width, (ub4 *) 0, (ub4) OCI_ATTR_DATA_SIZE, errhp); /* allocate memory to hold the result */ pFirstName = (oratext *) malloc(sizeof(oratext) * (col_width + 1)); /* define the second column in the results */ result = OCIDefineByPos(cursr, &defp2, errhp, 2, (dvoid *) pFirstName, (sword) col_width + 1, SQLT_STR, (dvoid *) NULL, (ub2 *) 0, (ub2 *) 0, OCI_DEFAULT); /* get the third column width in characters */ result = OCIAttrGet((dvoid*) prmp3, (ub4) OCI_DTYPE_PARAM, (dvoid*) &col_width, (ub4 *) 0, (ub4) OCI_ATTR_DATA_SIZE, errhp); /* allocate memory to hold the result */ pLastName = (oratext *) malloc(sizeof(oratext) * (col_width + 1)); /* define the third column in the results */ result = OCIDefineByPos(cursr, &defp3, errhp, 3, (dvoid *) pLastName, (sword) col_width + 1, SQLT_STR, (dvoid *) NULL, (ub2 *) 0, (ub2 *) 0, OCI_DEFAULT); /* loop through and print the results */ while ((result = OCIStmtFetch(cursr, errhp, (ub4) 1, (ub2) OCI_FETCH_NEXT, (ub4) OCI_DEFAULT)) == OCI_SUCCESS) { printf("Employee ID: %s\n", pEmpId); printf(" First Name: %s\n", pFirstName); printf(" Last Name: %s\n\n", pLastName); } /* free allocated memory */ free(pEmpId); free(pFirstName); free(pLastName); pEmpId = NULL; pFirstName = NULL; pLastName = NULL; /* terminate the session with the database */ result = OCISessionEnd(svchp, errhp, usrhp, OCI_DEFAULT); /* detach from the server */ result = OCIServerDetach(srvhp, errhp, OCI_DEFAULT); /* deallocate the environment handle */ /* OCI will deallocate the child handles */ result = OCIHandleFree((dvoid *) envhp, OCI_HTYPE_ENV); return OCI_SUCCESS; } void checkerr(sword status, OCIError *errhp) { oratext errbuf[512]; sb4 errcode = 0; switch (status) { case OCI_SUCCESS: break; case OCI_ERROR: case OCI_SUCCESS_WITH_INFO: (void) OCIErrorGet((dvoid *) errhp, (ub4) 1, (oratext *) NULL, &errcode, errbuf, (ub4) sizeof(errbuf), OCI_HTYPE_ERROR); (void) printf("Error: %.*s\n", sizeof(errbuf), errbuf); break; case OCI_NEED_DATA: (void) printf("Error - OCI_NEED_DATA\n"); break; case OCI_NO_DATA: (void) printf("Error - OCI_NO_DATA\n"); break; case OCI_INVALID_HANDLE: (void) printf("Error - OCI_INVALID_HANDLE\n"); break; case OCI_STILL_EXECUTING: (void) printf("Error - OCI_STILL_EXECUTING\n"); break; case OCI_CONTINUE: (void) printf("Error - OCI_CONTINUE\n"); break; default: break; } } -
How to use Bulk collect in dynamic SQL with the example below:
My Question is
Using of dynamic SQL with collection in bulkif we pass the name of the table as "to the parameter' function, I want to display those
An array of column names without vowels (replace the vowels by spaces or remove vowels and display).
Please explain for example.
Thank you!!It's just a predefined type
SQL> desc sys.OdciVarchar2List sys.OdciVarchar2List VARRAY(32767) OF VARCHAR2(4000)You can just as easily declare your own collection type (and you are probably better served declaring your own type of readability if nothing else)
SQL> ed Wrote file afiedt.buf 1 CREATE OR REPLACE 2 PROCEDURE TBL_COLS_NO_VOWELS( 3 p_owner VARCHAR2, 4 p_tbl VARCHAR2 5 ) 6 IS 7 TYPE vc2_tbl IS TABLE OF varchar2(4000); 8 v_col_list vc2_tbl ; 9 BEGIN 10 EXECUTE IMMEDIATE 'SELECT COLUMN_NAME FROM DBA_TAB_COLUMNS WHERE OWNER = :1 AND TABLE_NAME = :2 ORDER BY COLUMN_ID' 11 BULK COLLECT 12 INTO v_col_list 13 USING p_owner, 14 p_tbl; 15 FOR v_i IN 1..v_col_list.COUNT LOOP 16 DBMS_OUTPUT.PUT_LINE(TRANSLATE(v_col_list(v_i),'1AEIOU','1')); 17 END LOOP; 18* END; SQL> / Procedure created. SQL> exec tbl_cols_no_vowels( 'SCOTT', 'EMP' ); MPN NM JB MGR HRDT SL CMM DPTN PL/SQL procedure successfully completed.Justin
-
The use of bind variables in dynamic query created for Ref Cursor
Hello
I'm in a situation where there is a Ref cursor to which the query is built execution based on a loop. This is why the number of links would be known until the program runs.
The application is currently using literals instead of bind variables.
code snippet of the above is
strSql: = "select * from emp where 1 = 1 and ().
loop cursor1
If cond is true then
strSql = strSql | "ename = ' |" Cursor1.ColumnName;
end loop;
Open cursor2 for strSql;
How to use links in the example above.sb92075 wrote:
user13019948 wrote:
HelloHere is the code I have my trying to change literal-based link to the base.
What do you mean by "based bind?
who, what, how determines the values to be 'bound '?
He's referring to the coding style. He is currently using concatenated literal, and the goal is to change it to use the bindings.
If I understand this it is known as method 4 dynamic SQL and requires DBMS_SQL. There are examples autour but they vary according to the type of statement being generated - SELECT statements require column lists to be parsed, unlike the INSERT/UPDATE/DELETE.
This came up recently on my current project and I hit a demo. Here a table of names and values accepted procedure and had to build these in a single WHERE clause along the lines of
AND t_names(i) = t_values(i)for an undetermined number of elements in the array. For this demonstration, I used a table that we called "attribute" (don't ask) which has columns including 'attribute_id' and 'name', and I need to build a query along the lines of
select description from attribute where attribute_id = :b1 and name = :b2by the way '1012' and 'ISIN' respectively. (I use a table better and after a CREATE statement for her but I have to rush right now, sorry).
declare k_sql_base constant varchar2(500) := 'select description from attribute'; t_names constant varchar2_t := varchar2_t('attribute_id', 'name'); t_values constant varchar2_t := varchar2_t('1012', 'ISIN'); l_sql varchar2(500) := k_sql_base; l_rows_fetched integer := 0; l_value varchar2(4000); l_cursor_handle integer; begin -- Construct the SQL statement with column names and bind variables e.g. -- 'select description from mars.attribute where attribute_id = :b1 and name = :b2' for i in t_names.first .. t_names.last loop l_sql := l_sql || case i when t_names.first then ' where ' else ' and ' end || t_names(i) || ' = :b' || i; end loop; dbms_output.put_line('SQL statment = ' || l_sql); -- Parse the statement we built above (the remaining steps require a parsed cursor): l_cursor_handle := dbms_sql.open_cursor; dbms_sql.parse(l_cursor_handle, l_sql, dbms_sql.native); -- Associate the 1st column of output with variable l_value - required for SELECT statements: -- (actually the 3rd param here 'column' seems to be only used to get a datatype, in this case we want a string - -- dbms_sql.column_value actually extracts the value into a specified variable, which can be different. -- All examples in the documentation pass a local variable without further comment, so not entirely clear what this does other than set the output datatype.) dbms_sql.define_column(l_cursor_handle, 1, l_value, 4000); -- Now go through values array binding actual values to :bn variables in the cursor (similar to USING clause of EXECUTE IMMEDIATE) for i in t_values.first .. t_values.last loop dbms_sql.bind_variable(l_cursor_handle, ':b'||i, t_values(i)); dbms_output.put_line('Bound :b'||i || ' as ' || t_values(i)); end loop; -- Open the cursor and fetch the result (no loop here because we are expecting a single-row result): l_rows_fetched := dbms_sql.execute_and_fetch(l_cursor_handle); -- 'Returns value of the cursor element for a given position in a cursor' -- Copy the value of column 1 to variable l_value (has to match -- dbms_sql.column_value(l_cursor_handle, 1, l_value); dbms_sql.column_value(l_cursor_handle, 1, l_value); dbms_output.put_line('Result = ''' || l_value || ''''); dbms_sql.close_cursor(l_cursor_handle); end;Hope that helps...
-
Dynamic SQL with in bulk in the record type
Oracle 10.2 g
I received this Tom
[http://asktom.oracle.com/pls/apex/f?p=100:11:0:NO:]
I'm able to do this without dynamic SQL, but my requirement is to do it in dynamic SQL
There is a work around in 11g, but can we do something in 10g?create table t1 ( x int, y int ); insert into t1 select rownum, rownum+1 from all_users where rownum <= 5; create table t2 ( x int, y int, z int ); declare type array is table of t1%rowtype; l_data array; begin select * bulk collect into l_data from t1; forall i in 1 .. l_data.count execute immediate 'insert into (select x, y from t2) values :x' using l_data(i); end; Error at line 1 ORA-06550: line 9, column 90: PLS-00457: expressions have to be of SQL types ORA-06550: line 9, column 20: PL/SQL: Statement ignored
Thank you
HESH.HESH wrote:
but following does not.
declare type array is table of t1%rowtype; l_data array; begin select * bulk collect into l_data from t1; forall i in 1 .. l_data.count execute immediate 'insert into (select x, y from t2) values :x' using l_data(i); end;I want just a dynamic SQL code for the insert with FORALL statement would adopt as well as collections.
Doesn't make much sense.
Extract you the data from the SQL engine in the table of the record type. If the output data that cursor SQL must be read in the SQL engine and copied into the memory of PL/SQL engine.
Then, you send that VERY SAME DATA back to the SQL engine to be used by a SQL insert cursor.
Where is the logic behind the extraction of data from SQL in a PL/SQL table structure and then push this same structure table on the SQL engine database? What is the purpose to send data on a detour of underperforming and non-scalale through the PL/SQL engine?
You have any justification (technical or functional wise) to back up this absurd approach?
Why this can be achieved using a single SQL cursor that does both the choice (extraction) and (in bulk) insertion - using the plain old INSERT... SELECT structure?
And if the insert is variable, then what? Create a dynamic INSERT... SELECT cursor and execute it (using bind values). This simple... Right?
-
PL/SQL - Call Out Ref Cursor returned by a stored procedure
Hello
I am creating a procedure where a Ref Cursor is defined as an OUT parameter, my question is how to shout that the Ref Cursor when I run for example here is how I want to call my EXEC sql command:
EXEC film_not_in_stock (2,2,vcur);
Here is the procedure:
CREATE OR REPLACE PROCEDURE film_not_in_stock (p_film_id in NUMBER, p_store_id number, vcur ON SYS_REFCURSOR)
IS
News sys_refcursor;
v_cur inventory.inventory_id%TYPE--ou is the same type of column inventory_id
v_cur sys_refcursor;
BEGIN
Heart OPEN to SELECT inventory_id
INVENTORY
WHERE film_id = p_film_id
AND store_id = p_store_id
AND inventory_id NOT IN (SELECT inventory_in_stock (inventory_id) FROM dual);
News of FETCH in v_cur;
OUTPUT WHEN heart % NOTFOUND;
END;
/
I know there are typos in the procedure, you will appreciate if you can help me to put it right.
Thank you very much!
Tonya.
In fact, based on your previous post, function inventory_in_stock returns 0 or 1. If so, there are:
CREATE OR REPLACE
PROCEDURE film_not_in_stock)
p_film_id in NUMBERS
p_store_id in NUMBERS
p_cur ON SYS_REFCURSOR
)
IS
News sys_refcursor;
v_cur inventory.inventory_id%TYPE--ou is the same type of column inventory_id
v_cur sys_refcursor;
BEGIN
OPEN p_cur
FOR
SELECT inventory_id
INVENTORY
WHERE film_id = p_film_id
AND store_id = p_store_id
AND inventory_in_stock (inventory_id) = 0;
News of FETCH in v_cur;
OUTPUT WHEN heart % NOTFOUND;
END;
/
SY.
-
Call a procedure stored via JDBC with a REF CURSOR * input variable.
Hello
S/n of my client has provided me with a stored procedure that I need to call to get information about products prices. Something along the lines of:
some_package.getPrices (products IN OUT csr_type);
where csr_type represents a REF CURSOR. This cursor has a product ID column and a price column. The plan is to move the cursor with the populated product id column and have the routine decorate the slider with the prices.
The setting in this plan is that it seems that it is not possible to go from JDBC REF CURSOR in . However, I'm not sure, since I can only find throw comments on various forums (e.g. http://www.orafaq.com/forum/t/35088/0/), without any reference. If I go back to the client and tell them that their idea will not work, I prefer to be able to point them to a documentation somewhere
So I guess my questions are:
1. it is indeed impossible to pass a REF CURSOR type as a variable input on JDBC to a stored procedure?
2. is there information I can do about my client?
3. am I on the right track thinking I need to go down the path of an array of objects?
Thank you very much to anyone who can help
Peter Svehla.Hi Peter,.
I see it, missed that you actually want to pass in a list of products. Don't think that you can do this with the current procedure. A slider is just a pointer to a result set.
How the result set is created and what it looks like, is determined when the cursor is opened.What does this procedure with the cursor? -It does not have some OPEN
TO ; inside? Or, perhaps, you are supposed to send in an open cursor (does not much sense to me)?
Concerning
Peter -
dynamic SQL with unknown bind name
I have some difficulty with the following text:
I have a CLOB with an sql statement. The predikates of the statement contain an unknown number of bind variables.
I want to have the number of links and the name of the dregs.
(Though I now have the name, I can get the value elsewhere and use dbms_sql.bind_array/bind_variable)
Some idea how?
with
sql_queries as
(select (to_clob)
q' {}
Select *.
WCP
where hiredate between to_date(:start_date,'yyyymmdd') and to_date(:end_date,'yyyymmdd')
and = job: job
(}') sql_txt
of the double
)
Select regexp_substr(sql_txt,':\w+',1,level) bind_variable
of sql_queries
connect by level<=>
BIND_VARIABLE : start_date : end_date : job Concerning
Etbin
-
Oracle dynamic SQL with the UNION operator
Hello
I have sql string contains two queries separated by the UNION operator. When I run by using DBMS_SQL, it becomes only the first SQL before the UNION operator.
Can anyone correct how can I Sue UNION in DBMS_SQL?
Thank youSorry,
I tested my code
BEGIN FOR I IN (SELECT 1 A FROM DUAL UNION SELECT 2 A FROM DUAL UNION SELECT 3 A FROM DUAL) LOOP DBMS_OUTPUT.PUT_LINE(I.A); END LOOP; END;and copy this code and PASE to DBMS_SQL. PARSE (all other cases, "... and insert the INSERT STATEMENT but does not erase DBMS_OUTPUT.")
Edited by: Quluzade Mr. Mahir on February 28, 2011 12:18
-
Ref Cursor on implicit and explicit cursors
Hello
In my company the drafting of PL/SQL procedure, everyone uses "Ref Cursor",
But the article below, said implicit is the best, then Explicit and Ref Cursor...
[http://www.oracle-base.com/forums/viewtopic.php?f=2 & t = 10720]
I'm a bit confused by this, can someone help me understand this?
Thank youSeshuGiri wrote:
In my company the drafting of PL/SQL procedure, everyone uses "Ref Cursor",
But the article below, said implicit is the best, then Explicit and Ref Cursor...[http://www.oracle-base.com/forums/viewtopic.php?f=2&t=10720]
I'm a bit confused by this, can someone help me understand this?
It has performance and it has performance...
To explain. There is one type of cursor in Oracle - that is the cursor which is analyzed and compiled by the SQL engine and stored in the shared the database pool. The "+ client +" then receives a handle (called a SQL statement handle of many APIs) that can be used to make reference to this slider in the SQL engine.
The performance of this slider is not determined by the customer. It is determined by the execution plan and how much enforcement of this slider cost ito of server resources.
The customer can be Java, VB, .net - or a PL/SQL program. This client language (SQL client), has its own structures dealing with this from the SQL engine cursor handle.
It can hide by the developer all together - so that they can't even see that there is a statement handle. That's what the implicit cursors in PL/SQL.
It can allow the developer to manually define the structure of slider - this is what the explicit cursors, ref Cursor and DBMS_SQL cursors in PL/SQL.
Each of these client cursor structures provides the programmer with a set of features to address different SQL cursor. Explicit cursor in PL/SQL constructs do not have the use of dynamic SQL statements. REF CURSOR and cursors DBMS_SQL do. REF CURSOR does not allow the programmer determine, at runtime, the structure of the projection of the cursor SQL. DBMS_SQL sliders do.
Only ref Cursor can be created in PL/SQL and then handed over to another client (for example, Java/VB) for treatment. Etc.
If each of the works of art/customer interfaces gives you a different feature for SQL cursors.
Choose the implicit cursors for example does not the SQL cursor move faster. The SQL engine does not know and does not care, which customer construct you use to deal with the SQL cursor handle, he gave you. It does not matter. It does not affect his performance of cursor SQL.
But on the client side, it can matter - if your code when dealing with that SQL cursor determines how fast your interaction with this SQL cursor is. How many context changes you make. How you use and reuse the SQL (for example hard vs soft analysis vs analysis reusing the same cursor handle). Etc.
Are there any unique client cursor construction which is better? N °
It's ignorant views. The customer's language provides a box tool, where each tool has a specific application. The competent developer will use the right tool for the job. The stupid developer will select a tool and use it as The Hammer to 'solve' all problems.
-
Hello people,
I'm just wondering that when you want to handle the large amount of lines we use FORALL to reduce the change of context. So, what happens if when we use dynamic sql instead of normal SQL FORALL. I mean using the dynamic SQL inside FORALL increase performance?
Because I know that when we use the variable binding in sql statements or questions, then it will scan only just 1 hour instead of every time. Therefore, other SQL statements don't need to analyze which does not have a performance gain?
FORALL reduced context switching AND SQL dynamic with bind variable prevent unnecessarily analysis, so wheren here are using hear, she will be better performance isn't? Please correct me if I'm wrong.
For example;
Thank you very much.FORALL i IN l_in_tab.first .. l_in_tab.last EXECUTE IMMEDIATE 'DELETE FROM bulk_collect_test WHERE object_id = :1' USING l_in_tab(i);>
Dynamic SQL with variable bind unnecessarily prevent analysis
>
Yes - compared to dynamic SQL that does not bind variable.Just use
DELETE FROM bulk_collect_test WHERE object_id = l_in_tab(i);FORALL essentially uses a form of BONDING in BULK already
See reduction in overhead costs of loop for DML statements and queries with SQL in bulk in Chapter 12 Applications of PL/SQL Tuning of Performance in the PL/SQL doc
http://docs.Oracle.com/CD/B28359_01/AppDev.111/b28370/tuning.htm#sthref1455>
Bulk SQL uses PL/SQL collections to pass back and forth large quantities of data in simple operations. This process is called binding of bulk. If the collection has n elements, bulk binding uses a single operation to perform the equivalent of n SELECT INTO, INSERT, UPDATE, or DELETE statements -
Ref cursor - result series is not known
Hi all
My requirement is as below
(1) the query to run is stored in a table because the query vary each time
(2) execution of the query and treat it
As the query could be of any table that I'm stuck on go get the query in a variable and treatment. Pls see my example below
CUR cursor is
Select sql_stmt sql1 - extract the sql to run
RTA;
Open p_cursor for sql1; -Open the ref cursor
loop
look for p_cursor in? * -as the result set does not know initially how to declare a variable for it *.
output p_cursor % notfound;
-the results of the process
end loop;
Help, please. Hope I'm clear with my question. If not, please let me knowOracle says:
Hi allMy requirement is as below
(1) the query to run is stored in a table because the query vary each time
(2) execution of the query and treat itAs the query could be of any table that I'm stuck on go get the query in a variable and treatment. Pls see my example below
CUR cursor is
Select sql_stmt sql1 - extract the sql to run
RTA;Open p_cursor for sql1; -Open the ref cursor
loop
look for p_cursor in? * -as the result set does not know initially how to declare a variable for it *.
output p_cursor % notfound;
-the results of the process
end loop;Help, please. Hope I'm clear with my question. If not, please let me know
Storage of queries in a table? This looks like a bad design, not to mention the possibility of SQL injection and causing ALL of your code to be written to be dynamic, where a nightmare to debug. Ouch!
You will not be able to do with a ref cursor if you don't know what to expect as the columns returned.
You can use the DBMS_SQL package and describe the query so that you can find on the columns and data types in the results... example of this package... (my example standard production CSV files)...-----
As user sys:
CREATE OR REPLACE DIRECTORY TEST_DIR AS '\tmp\myfiles' / GRANT READ, WRITE ON DIRECTORY TEST_DIR TO myuser /As myuser:
CREATE OR REPLACE PROCEDURE run_query(p_sql IN VARCHAR2 ,p_dir IN VARCHAR2 ,p_header_file IN VARCHAR2 ,p_data_file IN VARCHAR2 := NULL) IS v_finaltxt VARCHAR2(4000); v_v_val VARCHAR2(4000); v_n_val NUMBER; v_d_val DATE; v_ret NUMBER; c NUMBER; d NUMBER; col_cnt INTEGER; f BOOLEAN; rec_tab DBMS_SQL.DESC_TAB; col_num NUMBER; v_fh UTL_FILE.FILE_TYPE; v_samefile BOOLEAN := (NVL(p_data_file,p_header_file) = p_header_file); BEGIN c := DBMS_SQL.OPEN_CURSOR; DBMS_SQL.PARSE(c, p_sql, DBMS_SQL.NATIVE); d := DBMS_SQL.EXECUTE(c); DBMS_SQL.DESCRIBE_COLUMNS(c, col_cnt, rec_tab); FOR j in 1..col_cnt LOOP CASE rec_tab(j).col_type WHEN 1 THEN DBMS_SQL.DEFINE_COLUMN(c,j,v_v_val,2000); WHEN 2 THEN DBMS_SQL.DEFINE_COLUMN(c,j,v_n_val); WHEN 12 THEN DBMS_SQL.DEFINE_COLUMN(c,j,v_d_val); ELSE DBMS_SQL.DEFINE_COLUMN(c,j,v_v_val,2000); END CASE; END LOOP; -- This part outputs the HEADER v_fh := UTL_FILE.FOPEN(upper(p_dir),p_header_file,'w',32767); FOR j in 1..col_cnt LOOP v_finaltxt := ltrim(v_finaltxt||','||lower(rec_tab(j).col_name),','); END LOOP; -- DBMS_OUTPUT.PUT_LINE(v_finaltxt); UTL_FILE.PUT_LINE(v_fh, v_finaltxt); IF NOT v_samefile THEN UTL_FILE.FCLOSE(v_fh); END IF; -- -- This part outputs the DATA IF NOT v_samefile THEN v_fh := UTL_FILE.FOPEN(upper(p_dir),p_data_file,'w',32767); END IF; LOOP v_ret := DBMS_SQL.FETCH_ROWS(c); EXIT WHEN v_ret = 0; v_finaltxt := NULL; FOR j in 1..col_cnt LOOP CASE rec_tab(j).col_type WHEN 1 THEN DBMS_SQL.COLUMN_VALUE(c,j,v_v_val); v_finaltxt := ltrim(v_finaltxt||',"'||v_v_val||'"',','); WHEN 2 THEN DBMS_SQL.COLUMN_VALUE(c,j,v_n_val); v_finaltxt := ltrim(v_finaltxt||','||v_n_val,','); WHEN 12 THEN DBMS_SQL.COLUMN_VALUE(c,j,v_d_val); v_finaltxt := ltrim(v_finaltxt||','||to_char(v_d_val,'DD/MM/YYYY HH24:MI:SS'),','); ELSE v_finaltxt := ltrim(v_finaltxt||',"'||v_v_val||'"',','); END CASE; END LOOP; -- DBMS_OUTPUT.PUT_LINE(v_finaltxt); UTL_FILE.PUT_LINE(v_fh, v_finaltxt); END LOOP; UTL_FILE.FCLOSE(v_fh); DBMS_SQL.CLOSE_CURSOR(c); END;This allows the header line and the data to write into files separate if necessary.
for example
SQL> exec run_query('select * from emp','TEST_DIR','output.txt'); PL/SQL procedure successfully completed.Output.txt file contains:
empno,ename,job,mgr,hiredate,sal,comm,deptno 7369,"SMITH","CLERK",7902,17/12/1980 00:00:00,800,,20 7499,"ALLEN","SALESMAN",7698,20/02/1981 00:00:00,1600,300,30 7521,"WARD","SALESMAN",7698,22/02/1981 00:00:00,1250,500,30 7566,"JONES","MANAGER",7839,02/04/1981 00:00:00,2975,,20 7654,"MARTIN","SALESMAN",7698,28/09/1981 00:00:00,1250,1400,30 7698,"BLAKE","MANAGER",7839,01/05/1981 00:00:00,2850,,30 7782,"CLARK","MANAGER",7839,09/06/1981 00:00:00,2450,,10 7788,"SCOTT","ANALYST",7566,19/04/1987 00:00:00,3000,,20 7839,"KING","PRESIDENT",,17/11/1981 00:00:00,5000,,10 7844,"TURNER","SALESMAN",7698,08/09/1981 00:00:00,1500,0,30 7876,"ADAMS","CLERK",7788,23/05/1987 00:00:00,1100,,20 7900,"JAMES","CLERK",7698,03/12/1981 00:00:00,950,,30 7902,"FORD","ANALYST",7566,03/12/1981 00:00:00,3000,,20 7934,"MILLER","CLERK",7782,23/01/1982 00:00:00,1300,,10The procedure allows for the header and the data to separate files if necessary. Just by specifying the file name "header" will put the header and the data in a single file.
Adapt to the exit of styles and different types of data are needed.
-
Hi guys,.
You can develop the ref cursor please. I'm new to the plsql...
Hi Alex,
Introduction to the REF CURSOR
With the help of
REFCURSORs is one of the most powerful, flexible and scalable means to return the query results to an Oracle database to a client application.A
REFCURSORis a PL/SQL data type whose value is the memory address of a workspace of query on the database. In essence, aREFCURSORis a pointer or a handle to a game on the database of results.REFCURSORs are represented by theOracleRefCursorclass ODP.NET.REFCURSORs have the following characteristics:- A
REFCURSORrefers to a memory on the database address. Therefore, the client must be connected to the database during the lifetime of theREFCURSORto access. - A
REFCURSORinvolves a round-trip of additional database. While theREFCURSORis returned to the customer, the actual data is not returned until the customer open itREFCURSORand requests the data. Note that the data are not be retrieved until the user tries to read it. - A
REFCURSORis not editable. The result set represented by theREFCURSORis read-only. You cannot update the database using aREFCURSOR. - A
REFCURSORis not back with scroll. The data represented by theREFCURSORis only accessible in a way before and in series. You cannot position a record pointer inside theREFCURSORto point to records in the result set. - A
REFCURSORis a PL/SQL data type. You create and return aREFCURSORwithin a block of PL/SQL code.
See this link which explained on cursor by Zerathul ref: PL/SQL 101: understanding Ref Cursor
Kind regards
Jitendra
- A
-
Example of using a Ref Cursor variable procedure
I'm looking for an example of how to execute a stored procedure with a Ref cursor variable in SQL Developer 3.0. I am familiar with the syntax in SQL * Plus, for example:
variable my_cur refcursor;
Start
my_package.my_proc ("in param"
(: my_cur);
end;
/
print: my_cur
How would I do the same thing in SQL Developer 3.0?
Thank you!Run a procedure directly. For example, select the package in the browser-> menu-> Run. The dialogue with anonymous block box. Edit, OK it to run, then the procedure would be and all settings including Ref Cursor appear in the grid. (This functionality is there since 3.0)
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