ORA-01489 sys_connect_by_path and previous solution does not

Hi all.

Oracle version:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
"CORE 11.2.0.1.0 Production."
AMT for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production

I need to get directions in a card and the associated amount long distances to another.

map
--     9
  F ----------E
  | \         |
  |  \2       |6
  |   \   11  |
14|   C-------D
  |  / \10   /
  | /9  \   /15
  |/     \ /
  A-------B
     7

I have a query that gets the roads properly.

WITH distances AS
(
     SELECT 'A' n1, 'B' n2, 7 d FROM DUAL UNION
     SELECT 'A' n1, 'C' n2, 9 d FROM DUAL UNION
     SELECT 'A' n1, 'F' n2, 14 d FROM DUAL UNION
     SELECT 'B' n1, 'D' n2, 15 d FROM DUAL UNION
     SELECT 'B' n1, 'C' n2, 10 d FROM DUAL UNION
     SELECT 'C' n1, 'D' n2, 11 d FROM DUAL UNION
     SELECT 'C' n1, 'F' n2, 2 d FROM DUAL UNION
     SELECT 'D' n1, 'E' n2, 6 d FROM DUAL UNION
     SELECT 'F' n1, 'E' n2, 9 d FROM DUAL
)
SELECT
     'A'||sys_connect_by_path(n2,'-') path,
     SUBSTR(sys_connect_by_path(d,'+'),2) sum_dist
FROM distances
START WITH n1='A'
CONNECT BY NOCYCLE PRIOR n2=n1;

A-B          7
A-B-C          7+10
A-B-C-D          7+10+11
A-B-C-D-E     7+10+11+6
A-B-C-F          7+10+2
A-B-C-F-E     7+10+2+9
A-B-D          7+15
A-B-D-E          7+15+6
A-C          9
A-C-D          9+11
A-C-D-E          9+11+6
A-C-F          9+2
A-C-F-E          9+2+9
A-F          14
A-F-E          14+9

The problem is when there is a lot of knots, I get an ORA-01489: result of concatenating string is too long.

I followed this link.

SYS_CONNECT_BY_PATH & to_CLOB

I built the package specified but apparently is combining elements.

If it is called only once.

WITH distances AS
(
     SELECT 'A' n1, 'B' n2, 7 d FROM DUAL UNION
     SELECT 'A' n1, 'C' n2, 9 d FROM DUAL UNION
     SELECT 'A' n1, 'F' n2, 14 d FROM DUAL UNION
     SELECT 'B' n1, 'D' n2, 15 d FROM DUAL UNION
     SELECT 'B' n1, 'C' n2, 10 d FROM DUAL UNION
     SELECT 'C' n1, 'D' n2, 11 d FROM DUAL UNION
     SELECT 'C' n1, 'F' n2, 2 d FROM DUAL UNION
     SELECT 'D' n1, 'E' n2, 6 d FROM DUAL UNION
     SELECT 'F' n1, 'E' n2, 9 d FROM DUAL
)
SELECT
     'A'||'-'||hierarchy.branch(LEVEL,n2,'-') path
FROM distances
START WITH n1='A'
CONNECT BY NOCYCLE PRIOR n2=n1;

A-B
A-B-C
A-B-C-D
A-B-C-D-E
A-B-C-F
A-B-C-F-E
A-B-D
A-B-D-E
A-C
A-C-D
A-C-D-E
A-C-F
A-C-F-E
A-F

But if I call it twice in the same query...

WITH distances AS
(
     SELECT 'A' n1, 'B' n2, 7 d FROM DUAL UNION
     SELECT 'A' n1, 'C' n2, 9 d FROM DUAL UNION
     SELECT 'A' n1, 'F' n2, 14 d FROM DUAL UNION
     SELECT 'B' n1, 'D' n2, 15 d FROM DUAL UNION
     SELECT 'B' n1, 'C' n2, 10 d FROM DUAL UNION
     SELECT 'C' n1, 'D' n2, 11 d FROM DUAL UNION
     SELECT 'C' n1, 'F' n2, 2 d FROM DUAL UNION
     SELECT 'D' n1, 'E' n2, 6 d FROM DUAL UNION
     SELECT 'F' n1, 'E' n2, 9 d FROM DUAL
)
SELECT
     'A'||SUBSTR(hierarchy.branch(LEVEL,n2,'-'),2) path,
     hierarchy.branch(LEVEL,d,'+') sum_dist
FROM distances
START WITH n1='A'
CONNECT BY NOCYCLE PRIOR n2=n1;

A          7
A-C          7+10
A-10-D          7+10+11
A-10-11-E     7+10+11+6
A-10-F          7+10+2
A-10-2-E     7+10+2+9
A-D          7+15
A-15-E          7+15+6
A          9
A-D          9+11
A-11-E          9+11+6
A-F          9+2
A-2-E          9+2+9

As you can see, is to combine the node elements (A-10-11-E) - node distance - distance-

Do I have to create separate functions in the package, one per column?, or is there another way to solve this problem?, or better yet, another way to solve the original problem (ORA-01489)

Thank you very much.

Kind regards.

Package (by Solomon Yakobson) code:

CREATE OR REPLACE
  PACKAGE Hierarchy
    IS
        TYPE BranchTableVarchar2Type IS TABLE OF VARCHAR2(4000)
          INDEX BY BINARY_INTEGER;
        BranchTableVarchar2 BranchTableVarchar2Type;
        TYPE BranchTableClobType IS TABLE OF CLOB
          INDEX BY BINARY_INTEGER;
        BranchTableClob BranchTableClobType;
        FUNCTION Branch(
                        p_Level          IN NUMBER,
                        p_Value          IN VARCHAR2,
                        p_Delimiter      IN VARCHAR2 DEFAULT CHR(0)
                       )
          RETURN VARCHAR2;
        PRAGMA RESTRICT_REFERENCES(Branch,WNDS);
        FUNCTION Branch(
                        p_Level          IN NUMBER,
                        p_Value          IN CLOB,
                        p_Delimiter      IN VARCHAR2 DEFAULT CHR(0)
                       )
          RETURN CLOB;
        PRAGMA RESTRICT_REFERENCES(Branch,WNDS);
END Hierarchy;
/ 
CREATE OR REPLACE
  PACKAGE BODY Hierarchy
    IS
        ReturnValueVarchar2 VARCHAR2(4000);
        ReturnValueClob     CLOB;
    FUNCTION Branch(
                    p_Level        IN NUMBER,
                    p_Value        IN VARCHAR2,
                    p_Delimiter    IN VARCHAR2 DEFAULT CHR(0)
                   )
      RETURN VARCHAR2
      IS
      BEGIN
          BranchTableVarchar2(p_Level) := p_Value;
          ReturnValueVarchar2          := p_Value;
          FOR I IN REVERSE 1..p_Level - 1 LOOP
            ReturnValueVarchar2 := BranchTableVarchar2(I)|| p_Delimiter || ReturnValueVarchar2;
          END LOOP;
          RETURN ReturnValueVarchar2;
    END Branch;
    FUNCTION Branch(
                    p_Level        IN NUMBER,
                    p_Value        IN CLOB,
                    p_Delimiter    IN VARCHAR2 DEFAULT CHR(0)
                   )
      RETURN CLOB
      IS
      BEGIN
          BranchTableClob(p_Level) := p_Value;
          ReturnValueClob          := p_Value;
          FOR I IN REVERSE 1..p_Level - 1 LOOP
            ReturnValueClob := BranchTableClob(I)|| p_Delimiter || ReturnValueClob;
          END LOOP;
          RETURN ReturnValueClob;
    END Branch;
END Hierarchy;
/

Published by: sKr on 08-mar-2012 17:29
Added package code

Hello

sKr wrote:
Hi all.

Oracle version:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
"CORE 11.2.0.1.0 Production."
AMT for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production

I need to get directions in a card and the associated amount long distances to another.
map
--     9
F ----------E
| \         |
|  \2       |6
|   \   11  |
14|   C-------D
|  / \10   /
| /9  \   /15
|/     \ /
A-------B
7
...

I wish we could mark questions as 'Useful' or 'Correct '. You get 10 points for sure.

Do I have to create separate functions in the package, one per column.

You need to separate the functions. A user-defined function should be enough, just like a built-in version of SYS_CONNECT_BY_PATH is sufficient. All that should be stored in their own country, he knows that he needs to keep a separate copy for each argument to which you call it with. The problem with the package, which had been initially posted, is that there is only a single BranchTableVarchar2 of internal variables. Instead of a variable, an array of similar variables and add an optional argument to the funtion branch to tell him which item in this table to use.

CREATE OR REPLACE
  PACKAGE Hierarchy
    IS
        TYPE BranchTableVarchar2Type IS TABLE OF VARCHAR2(4000)
          INDEX BY BINARY_INTEGER;
        BranchTableVarchar2 BranchTableVarchar2Type;

     TYPE VList     IS TABLE OF BranchTableVarchar2Type          -- ***  NEW  ***
       INDEX BY     BINARY_INTEGER;                         -- ***  NEW  ***
     vl     VList;                                      -- ***  NEW  ***

        TYPE BranchTableClobType IS TABLE OF CLOB
          INDEX BY BINARY_INTEGER;
        BranchTableClob BranchTableClobType;

        FUNCTION Branch(
                        p_Level          IN NUMBER,
                        p_Value          IN VARCHAR2,
                        p_Delimiter      IN VARCHAR2     DEFAULT CHR(0),
               p_PathNum      IN PLS_INTEGER     DEFAULT     1     -- ***  NEW  ***
                       )
          RETURN VARCHAR2;
        PRAGMA RESTRICT_REFERENCES(Branch,WNDS);

        FUNCTION Branch(
                        p_Level          IN NUMBER,
                        p_Value          IN CLOB,
                        p_Delimiter      IN VARCHAR2 DEFAULT CHR(0)
                       )
          RETURN CLOB;
        PRAGMA RESTRICT_REFERENCES(Branch,WNDS);
END Hierarchy;
/
SHOW ERRORS

PROMPT     ==========  FK BODY  ==========

CREATE OR REPLACE
  PACKAGE BODY Hierarchy
    IS
        ReturnValueVarchar2 VARCHAR2(4000);
        ReturnValueClob     CLOB;

    FUNCTION Branch(
                    p_Level        IN NUMBER,
                    p_Value        IN VARCHAR2,
                    p_Delimiter    IN VARCHAR2       DEFAULT CHR(0),
              p_PathNum        IN PLS_INTEGER DEFAULT 1     -- ***  NEW  ***
                   )
      RETURN VARCHAR2
      IS
      BEGIN
          vl (p_PathNum) (p_Level) := p_Value;               -- ***  CHANGED  ***
          ReturnValueVarchar2          := p_Value;
          FOR I IN REVERSE 1..p_Level - 1 LOOP
            ReturnValueVarchar2 := vl (p_PathNum) (I)          -- ***  CHANGED  ***
                         || p_Delimiter
                     || ReturnValueVarchar2;
          END LOOP;
          RETURN ReturnValueVarchar2;
    END Branch;

    FUNCTION Branch(
                    p_Level        IN NUMBER,
                    p_Value        IN CLOB,
                    p_Delimiter    IN VARCHAR2 DEFAULT CHR(0)
                   )
      RETURN CLOB
      IS
      BEGIN
          BranchTableClob(p_Level) := p_Value;
          ReturnValueClob          := p_Value;
          FOR I IN REVERSE 1..p_Level - 1 LOOP
            ReturnValueClob := BranchTableClob(I)|| p_Delimiter || ReturnValueClob;
          END LOOP;
          RETURN ReturnValueClob;
    END Branch;
END Hierarchy;
/
SHOW ERRORS

As you can see, I only changed the version of VARCHAR2. Let you change the CLOB as an exercise for you.

When you call branch, pass a unique number for each output column. If you do not explicitly give a default number is 0.
Here's your query modified to call it:

SELECT  'A' || SUBSTR ( hierarchy.branch ( LEVEL
                                       , n2
                          , '-'
                          )
                , 2
                )          AS path
,     hierarchy.branch ( LEVEL
                , d
                , '+'
                , 12
                )     AS sum_dist
FROM    distances
START WITH          n1 = 'A'
CONNECT BY NOCYCLE      PRIOR n2     = n1
;

Path, I called the branch with only 3 arguments, so that it uses vl (0) for internal storage for the path.
For sum_dist, I had to use a different integer. I couldn't decide if I should use 1 or 2, so I compromised and used 12. I could have used any integer, except 0.
Output:

PATH                           SUM_DIST
------------------------------ -----------------------------
A                              7
A-C                            7+10
A-C-D                          7+10+11
A-C-D-E                        7+10+11+6
A-C-F                          7+10+2
A-C-F-E                        7+10+2+9
A-D                            7+15
A-D-E                          7+15+6
A                              9
A-D                            9+11
A-D-E                          9+11+6
A-F                            9+2
A-F-E                          9+2+9
A                              14
A-E                            14+9

or is there another way to solve this problem?, or better yet, another way to solve the original problem (ORA-01489)

Given that you call a user-defined set, you might want to add other features to the package.
For starters, in addition to a function that returns a string like "7 + 10 + 11', it might be useful to have a string that maintains these numbers internally, but returns the value 7 + 10 + 11 = 28.
If you use this for problems when you want to find the less total path (or the highest total d, for that of importance, but for now, let's say you are only interested in the minimum), you might want a function that keeps track of the minimum total d met so far for each node. Whenever you find a different path to a node, the function can check if the total d is better than the previous best. If this isn't the case, it could return an indicator (kind of similar CONNECT_BY_ISCYCLE) which indicates not bore you with this path.

Tags: Database

ORA-01489 sys_connect_by_path and previous solution does not

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