oracle备忘递归查询

1.Data dictionary Objects
source$
dba_procedures all_procedures user_procedures
dba_source all_source user_source
dba_types all_types user_types

2.System Privileges
alter any procedure
create any procedure
create procedure
debug any procedure
drop any procedure
execute any procedure
select any table
 
3.Table Definition

CREATE TABLE stocktable (
ticker       VARCHAR2(4),
open_price   NUMBER(10),
close_price  NUMBER(10)); 

4.Demo Data

INSERT INTO stocktable VALUES ('ORA', 13, 14);
INSERT INTO stocktable VALUES ('MSC', 85, 92);
INSERT INTO stocktable VALUES ('SUN', 23, 18);
COMMIT; 

5.Type Definition

CREATE OR REPLACE TYPE TickerType AS OBJECT (
ticker     VARCHAR2(4),
pricetype  VARCHAR2(1),
price      NUMBER(10));
/ 

6.Create Table Type

CREATE OR REPLACE TYPE TickerTypeSet AS TABLE OF TickerType;
/

7.Create Package

CREATE OR REPLACE PACKAGE refcur_pkg IS
TYPE refcur_t IS REF CURSOR RETURN StockTable%ROWTYPE;
END refcur_pkg;
/ 

8.Create Table Function

CREATE OR REPLACE FUNCTION stockpivot(
p refcur_pkg.refcur_t)
RETURN TickerTypeSet PIPELINED IS

out_rec  TickerType := TickerType(NULL,NULL,NULL);
in_rec   p%ROWTYPE;

BEGIN
  LOOP
    FETCH p INTO in_rec;
    EXIT WHEN p%NOTFOUND;

    out_rec.ticker := in_rec.Ticker;
    out_rec.pricetype := 'O';
    out_rec.price := in_rec.Open_Price;
    PIPE ROW(out_rec);

    out_rec.PriceType := 'C';
    out_rec.price := in_rec.Close_Price;
    PIPE ROW(out_rec);
  END LOOP;
  CLOSE p;
  RETURN;
END stockpivot;
/

desc stockpivot
col pipelined format a10
SELECT object_name, pipelined, authid
FROM user_procedures; 

9.Sample Query

SELECT *
FROM TABLE(stockpivot(CURSOR(SELECT * FROM StockTable))); 
 

10.Generate Date List

CREATE OR REPLACE TYPE date_array AS TABLE OF DATE;
/
CREATE OR REPLACE FUNCTION date_table(sdate DATE, edate DATE)
RETURN date_array PIPELINED AS

BEGIN
  FOR i IN 0 .. (edate - sdate)
  LOOP
    PIPE ROW(sdate + i);
  END LOOP;
  RETURN;
END date_table;
/

desc date_table

col pipelined format a10

SELECT object_name, pipelined, authid
FROM user_procedures;

SELECT *
FROM TABLE(CAST(date_table(TRUNC(SYSDATE-30), TRUNC(SYSDATE))
AS date_array));

-- joined with another table

CREATE TABLE testdata (
datecol  DATE,
someval  NUMBER);

INSERT INTO testdata VALUES (TRUNC(SYSDATE-25), 25);
INSERT INTO testdata VALUES (TRUNC(SYSDATE-20), 20);
INSERT INTO testdata VALUES (TRUNC(SYSDATE-15), 15);
INSERT INTO testdata VALUES (TRUNC(SYSDATE-10), 10);
INSERT INTO testdata VALUES (TRUNC(SYSDATE-5), 5);
COMMIT;

SELECT * FROM testdata;

SELECT da.column_value AS DATECOL, td.someval
FROM TABLE(CAST(date_table(TRUNC(SYSDATE-30), TRUNC(SYSDATE))
AS date_array)) da, testdata td
WHERE da.COLUMN_VALUE = td.datecol(+);  

11.Turning a comma delmimited list into a row-by-row output

CREATE OR REPLACE TYPE str_array AS TABLE OF VARCHAR2(10);
/

CREATE OR REPLACE FUNCTION tf(stringin VARCHAR2) RETURN str_array PIPELINED IS
 i    PLS_INTEGER;
 str  VARCHAR2(100);
 tab  sys.dbms_utility.uncl_array;
BEGIN
  str := '"' || REPLACE(stringin, ',', '","') || '"';
  sys.dbms_utility.comma_to_table(str, i, tab);

  FOR j IN 1 .. 5 LOOP
    PIPE ROW(TRANSLATE(tab(j),'A"','A'));
  END LOOP;
  RETURN;
END tf;
/

SELECT *
FROM TABLE(CAST(tf('1001,1002,1003,1004,1005')
AS str_array)); 

12.Drop PTF
DROP FUNCTION <function_name>;
DROP FUNCTION stockpivot;

--oracle 存储过程
 create or replace procedure proc1(  
    p_para1 varchar2,  
      p_para2 out varchar2,  
      p_para3 in out varchar2  
    )as   
     v_name varchar2(20);  
    begin  
      v_name := '张三丰';  
      p_para3 := v_name;  
     dbms_output.put_line('p_para3:'||p_para3);  
   end;  

递归查询
比如模块表 mod
字段
number modId
number parentModId
varchar modName

从下往上查
select * from mod m start with m.modId = ? connect by prior m.parentModId = m.modId

从上往下查
select * from mod m start with m.parentModId = ? connect by prior m.modId= m.parentModId

这样可以把它的所有关联项都查出来，
一定要注意connect by prior后面条件的顺序。