[英]Build <options> tags with FOR XML Path in SQL. Remove unwanted Attributes
[英]SQL Oracle XML empty tags and attributes
我有SQL / XML和Oracle的问题。 我使用Oracle的示例和dept和emp。 一开始的情况:我想要一个部门的xml和员工:
SELECT Xmlelement("employees", dept.deptno, Xmlagg(
Xmlelement("employee", ename))).
getStringVal()
FROM emp
INNER JOIN dept
ON dept.deptno = emp.deptno
GROUP BY dept.deptno;
现在我想要所有部门,即使没有任何员工(右外连接)。 此外,我想要员工的一些属性:
SELECT XMLELEMENT("employees", dept.deptno,
Xmlagg(
XMLELEMENT("employee",
xmlattributes(empno AS "empno", sal AS "salary"), ename)
)
).getStringVal()
FROM emp
right outer join dept
ON dept.deptno = emp.deptno
GROUP BY dept.deptno;
但现在没有员工的部门有一个空标记“员工”。 我有一个解决这个问题的方法:
SELECT xmlelement("employees",
xmlattributes(dept.deptno as "Abt"),
xmlagg( xmlforest(ename AS "employee") )
).getstringval()
FROM emp
RIGHT OUTER JOIN dept
ON dept.deptno = emp.deptno
GROUP BY dept.deptno;
现在我没有空标签,但我无法放置我想要的属性。 这个问题有什么解决方案吗?
最好的问候ses
使用此答案,您可以将DELETXML
添加到第二个查询中
SELECT DELETEXML(
XMLELEMENT("employees", dept.deptno,
Xmlagg(
XMLELEMENT("employee",
xmlattributes(empno AS "empno", sal AS "salary"), ename)
)
),
'//*[not(text())][not(*)]'
).getStringVal()
FROM emp
right outer join dept
ON dept.deptno = emp.deptno
GROUP BY dept.deptno;
样本输出
<employees>1<employee empno="1" salary="100">name1</employee></employees>
<employees>2<employee empno="2" salary="100">name2</employee></employees>
<employees>3<employee empno="3" salary="100">name3</employee></employees>
<employees>4</employees>
<employees>5</employees>
您可以使用案例表达式来首先不生成流氓<employee/>
节点:
SELECT XMLELEMENT("employees", dept.deptno,
Xmlagg(
CASE WHEN emp.empno IS NOT NULL THEN
XMLELEMENT("employee",
xmlattributes(empno AS "empno", sal AS "salary"), ename)
END
)
).getStringVal()
FROM emp
right outer join dept
ON dept.deptno = emp.deptno
GROUP BY dept.deptno;
XMLELEMENT("EMPLOYEES",DEPT.DEPTNO,XMLAGG(CASEWHENEMP.EMPNOISNOTNULLTHENXMLELEMENT("EMPLOYEE",XMLATTRIBUTES(EMPNOAS"EMPNO",SALAS"SALARY"),ENAME)END)).GETSTRINGVAL()
--------------------------------------------------------------------------------------------------------------------------------------------------------------------
<employees>10<employee empno="7839" salary="5000">KING</employee><employee empno="7934" salary="1300">MILLER</employee><employee empno="7782" salary="2450">CLARK</employee></employees>
<employees>20<employee empno="7566" salary="2975">JONES</employee><employee empno="7876" salary="1100">ADAMS</employee><employee empno="7369" salary="800">SMITH</employee><employee empno="7902" salary="3000">FORD</employee><employee empno="7788" salary="3000">SCOTT</employee></employees>
<employees>30<employee empno="7698" salary="2850">BLAKE</employee><employee empno="7900" salary="950">JAMES</employee><employee empno="7844" salary="1500">TURNER</employee><employee empno="7654" salary="1250">MARTIN</employee><employee empno="7521" salary="1250">WARD</employee><employee empno="7499" salary="1600">ALLEN</employee></employees>
<employees>40</employees>
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