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== An example of opening a cursor variable==



<source lang="sql">
SQL>
SQL>
SQL> create table product(
2 product_id number(4) not null,
3 product_description varchar2(20) not null
4 );
Table created.
SQL>
SQL> insert into product values (1,"Java");
1 row created.
SQL> insert into product values (2,"Oracle");
1 row created.
SQL> insert into product values (3,"C#");
1 row created.
SQL> insert into product values (4,"Javascript");
1 row created.
SQL> insert into product values (5,"Python");
1 row created.
SQL>
SQL>
SQL> DECLARE
2 TYPE rc is REF CURSOR;
3 refCursorValue rc;
4 BEGIN
5 OPEN refCursorValue FOR SELECT * from product;
6 /*...FETCH the results and process the resultset */
7 null;
8 END;
9 /
PL/SQL procedure successfully completed.
SQL>
SQL> drop table product;
Table dropped.</source>

== Open cursor with a dynamic select statement==



<source lang="sql">
SQL>
SQL> CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
2 ENAME VARCHAR2(10),
3 JOB VARCHAR2(9),
4 MGR NUMBER(4),
5 HIREDATE DATE,
6 SAL NUMBER(7, 2),
7 COMM NUMBER(7, 2),
8 DEPTNO NUMBER(2));
Table created.
SQL>
SQL> INSERT INTO EMP VALUES (7369, "SMITH", "CLERK", 7902, TO_DATE("17-DEC-1980", "DD-MON-YYYY"), 800, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7499, "ALLEN", "SALESMAN", 7698, TO_DATE("20-FEB-1981", "DD-MON-YYYY"), 1600, 300, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7521, "WARD", "SALESMAN", 7698, TO_DATE("22-FEB-1981", "DD-MON-YYYY"), 1250, 500, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7566, "JONES", "MANAGER", 7839, TO_DATE("2-APR-1981", "DD-MON-YYYY"), 2975, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7654, "MARTIN", "SALESMAN", 7698,TO_DATE("28-SEP-1981", "DD-MON-YYYY"), 1250, 1400, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7698, "BLAKE", "MANAGER", 7839,TO_DATE("1-MAY-1981", "DD-MON-YYYY"), 2850, NULL, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7782, "CLARK", "MANAGER", 7839,TO_DATE("9-JUN-1981", "DD-MON-YYYY"), 2450, NULL, 10);
1 row created.
SQL> INSERT INTO EMP VALUES (7788, "SCOTT", "ANALYST", 7566,TO_DATE("09-DEC-1982", "DD-MON-YYYY"), 3000, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7839, "KING", "PRESIDENT", NULL,TO_DATE("17-NOV-1981", "DD-MON-YYYY"), 5000, NULL, 10);
1 row created.
SQL> INSERT INTO EMP VALUES (7844, "TURNER", "SALESMAN", 7698,TO_DATE("8-SEP-1981", "DD-MON-YYYY"), 1500, 0, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7876, "ADAMS", "CLERK", 7788,TO_DATE("12-JAN-1983", "DD-MON-YYYY"), 1100, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7900, "JAMES", "CLERK", 7698,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 950, NULL, 30);
1 row created.
SQL> INSERT INTO EMP VALUES (7902, "FORD", "ANALYST", 7566,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 3000, NULL, 20);
1 row created.
SQL> INSERT INTO EMP VALUES (7934, "MILLER", "CLERK", 7782,TO_DATE("23-JAN-1982", "DD-MON-YYYY"), 1300, NULL, 10);
1 row created.
SQL>
SQL>
SQL> CREATE OR REPLACE PROCEDURE showemps (where_in IN VARCHAR2 := NULL)
2 IS
3 TYPE cv_typ IS REF CURSOR;
4 cv cv_typ;
5 v_nm emp.ename%TYPE;
6 BEGIN
7 OPEN cv FOR
8 "SELECT ename FROM emp WHERE " || NVL (where_in, "1=1");
9 LOOP
10 FETCH cv INTO v_nm;
11 EXIT WHEN cv%NOTFOUND;
12 DBMS_OUTPUT.PUT_LINE (v_nm);
13 END LOOP;
14 CLOSE cv;
15 END;
16 /
Procedure created.
SQL>
SQL> show error
No errors.
SQL>
SQL> EXEC showemps(null);
SMITH
ALLEN
WARD
JONES
MARTIN
BLAKE
CLARK
SCOTT
KING
TURNER
ADAMS
JAMES
FORD
MILLER
PL/SQL procedure successfully completed.
SQL>
SQL>
SQL> drop table emp;
Table dropped.
SQL></source>

== Opening multiple queries using the same cursor variable==



<source lang="sql">
SQL> create table product(
2 product_id number(4) not null,
3 product_description varchar2(20) not null
4 );
Table created.
SQL>
SQL> insert into product values (1,"Java");
1 row created.
SQL> insert into product values (2,"Oracle");
1 row created.
SQL> insert into product values (3,"C#");
1 row created.
SQL> insert into product values (4,"Javascript");
1 row created.
SQL> insert into product values (5,"Python");
1 row created.
SQL>
SQL>
SQL> create table company(
2 product_id number(4) not null,
3 company_id NUMBER(8) not null,
4 company_short_name varchar2(30) not null,
5 company_long_name varchar2(60)
6 );
Table created.
SQL> insert into company values(1,1001,"A Inc.","Long Name A Inc.");
1 row created.
SQL> insert into company values(1,1002,"B Inc.","Long Name B Inc.");
1 row created.
SQL> insert into company values(1,1003,"C Inc.","Long Name C Inc.");
1 row created.
SQL> insert into company values(2,1004,"D Inc.","Long Name D Inc.");
1 row created.
SQL> insert into company values(2,1005,"E Inc.","Long Name E Inc.");
1 row created.
SQL> insert into company values(2,1006,"F Inc.","Long Name F Inc.");
1 row created.
SQL>
SQL> DECLARE
2 TYPE rc is REF CURSOR;
3 refCursorValue rc;
4 productRecord product%ROWTYPE;
5 v_product_description VARCHAR2(20);
6 v_company_short_name VARCHAR2(30);
7 BEGIN
8 OPEN refCursorValue FOR SELECT *from product;
9
10 LOOP
11 FETCH refCursorValue INTO productRecord;
12 EXIT WHEN refCursorValue%NOTFOUND;
13 dbms_output.put_line(to_char(productRecord.product_id)||" "||
14 rpad(productRecord.product_description,20," "));
15 END LOOP;
16
17 OPEN refCursorValue FOR SELECT h.product_description,o.rupany_short_name
18 FROM company o,product h
19 WHERE o.product_id =h.product_id;
20
21 LOOP
22 FETCH refCursorValue INTO v_product_description,v_company_short_name;
23 EXIT WHEN refCursorValue%NOTFOUND;
24 dbms_output.put_line(rpad(v_product_description,20," ")||" "||rpad(v_company_short_name,30," "));
25 END LOOP;
26 CLOSE refCursorValue;
27 END;
28 /
1 Java
2 Oracle
3 C#
4 Javascript
5 Python
Java A Inc.
Java B Inc.
Java C Inc.
Oracle D Inc.
Oracle E Inc.
Oracle F Inc.
PL/SQL procedure successfully completed.
SQL>
SQL>
SQL> drop table product;
Table dropped.
SQL> drop table company;
Table dropped.
SQL></source>

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в 13:45, 26 мая 2010

Admin: 1 версия