XML et requete hierarchique

**SheikYerbouti** · 18/11/2009, 11h59

Bonjour,

J'ai trouvé le code suivant permettant de sortir en XML le résultat d'une requête hiérarchique:

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SQL> SELECT XMLELEMENT
  2            ("employees",
  3             (SELECT DBMS_XMLGEN.getxmltype
  4                        (DBMS_XMLGEN.newcontextfromhierarchy
  5                            ('SELECT level,
  6               XMLElement("employee",
  7                           XMLElement("empno", empno),
  8                           XMLElement("ename", ename),
  9                           XMLElement("sal", sal),
 10                           XMLElement("hiredate", hiredate))
 11           FROM emp
 12           START WITH mgr is null
 13           CONNECT BY PRIOR empno = mgr
 14           ORDER SIBLINGS BY ename'))
 15                FROM DUAL)) xmldoc
 16    FROM DUAL;
 
XMLDOC
-------------------------------------------------------------------
<employees><employee>
 
SQL>

Seulement, elle ne sort rien alors que la table contient des données:

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SQL> select * from emp;
 
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30
      7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
      7788 SCOTT      ANALYST         7566 09-DEC-82       3000                    20
      7839 KING       PRESIDENT            17-DEC-80       5000                    10
      7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30
      7876 ADAMS      CLERK           7788 12-JAN-83       1100                    20
 
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
      7900 JAMES      CLERK           7698 03-DEC-81        950                    30
      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
      7934 MILLER     CLERK           7782 09-DEC-82       1300                    10
 
14 rows selected.

une idée ?

**Waldar** · 18/11/2009, 13h32

J'ai juste rajouté le nom du schema, mais ici c'est ok.

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SELECT XMLELEMENT
           ("employees",
            (SELECT DBMS_XMLGEN.getxmltype
                       (DBMS_XMLGEN.newcontextfromhierarchy
                           ('SELECT level,
              XMLElement("employee",
                          XMLElement("empno", empno),
                          XMLElement("ename", ename),
                          XMLElement("sal", sal),
                          XMLElement("hiredate", hiredate))
          FROM scott.emp
          START WITH mgr is null
          CONNECT BY PRIOR empno = mgr
          ORDER SIBLINGS BY ename'))
               FROM DUAL)) xmldoc
   FROM DUAL;

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<employees><employee>
  <empno>7839</empno>
  <ename>KING</ename>
  <sal>5000</sal>
  <hiredate>1981-11-17</hiredate>
  <employee>
    <empno>7698</empno>
    <ename>BLAKE</ename>
    <sal>2850</sal>
    <hiredate>1981-05-01</hiredate>
    <employee>
      <empno>7499</empno>
      <ename>ALLEN</ename>
      <sal>1600</sal>
      <hiredate>1981-02-20</hiredate>
    </employee>
    <employee>
      <empno>7900</empno>
      <ename>JAMES</ename>
      <sal>950</sal>
      <hiredate>1981-12-03</hiredate>
    </employee>
    <employee>
      <empno>7654</empno>
      <ename>MARTIN</ename>
      <sal>1250</sal>
      <hiredate>1981-09-28</hiredate>
    </employee>
    <employee>
      <empno>7844</empno>
      <ename>TURNER</ename>
      <sal>1500</sal>
      <hiredate>1981-09-08</hiredate>
    </employee>
    <employee>
      <empno>7521</empno>
      <ename>WARD</ename>
      <sal>1250</sal>
      <hiredate>1981-02-22</hiredate>
    </employee>
  </employee>
  <employee>
    <empno>7782</empno>
    <ename>CLARK</ename>
    <sal>2450</sal>
    <hiredate>1981-06-09</hiredate>
    <employee>
      <empno>7934</empno>
      <ename>MILLER</ename>
      <sal>1300</sal>
      <hiredate>1982-01-23</hiredate>
    </employee>
  </employee>
  <employee>
    <empno>7566</empno>
    <ename>JONES</ename>
    <sal>2975</sal>
    <hiredate>1981-04-02</hiredate>
    <employee>
      <empno>7902</empno>
      <ename>FORD</ename>
      <sal>3000</sal>
      <hiredate>1981-12-03</hiredate>
      <employee>
        <empno>7369</empno>
        <ename>SMITH</ename>
        <sal>800</sal>
        <hiredate>1980-12-17</hiredate>
      </employee>
    </employee>
    <employee>
      <empno>7788</empno>
      <ename>SCOTT</ename>
      <sal>3000</sal>
      <hiredate>1987-04-19</hiredate>
      <employee>
        <empno>7876</empno>
        <ename>ADAMS</ename>
        <sal>1100</sal>
        <hiredate>1987-05-23</hiredate>
      </employee>
    </employee>
  </employee>
</employee>
</employees>

Testé sur Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 sous Windows.