Re: XML Parsing in Postgresql

Hi

2017-12-18 14:50 GMT+01:00 Abdul Hameedk <hameedka(at)hcl(dot)com>:

> I have below xml content. In oracle we are having cursor to extract the
> xml in row format. Do we have same like in POSGRES.
>
> <TABLES>
>
> <SEC_CALDAY> --Table name
>
> <ROW> --3 rows formed with ROW tag
>
> <SEC_DID>123</SEC_DID>
>
> <SOURCE>TEXT</SOURCE>
>
> <DAYS>31</DAYS>
>
> <OCCR>24</OCCR>
>
>
> <SEC_POLICYDETAILSID>45678</SEC_POLICYDETAILSID>
>
> </ROW>
>
> <ROW>
>
> <SEC_DID>456</SEC_DID>
>
> <SOURCE>TEXT</SOURCE>
>
> <DAYS>31</DAYS>
>
> <OCCR>24</OCCR>
>
>
> <SEC_POLICYDETAILSID>45679</SEC_POLICYDETAILSID>
>
> </ROW>
>
> <ROW>
>
> <SEC_DID>789</SEC_DID>
>
> <SOURCE>TEXT</SOURCE>
>
> <DAYS>31</DAYS>
>
> <OCCR>24</OCCR>
>
>
> <SEC_POLICYDETAILSID>45680</SEC_POLICYDETAILSID>
>
> </ROW>
>
> </SEC_CALDAY>
>
> </TABLES>
>
>
>
> *Oracle cursor to parse and textract the xml in row format.*
>
>
>
> CURSOR C_XMLSEC_CALDAY (B_XMLDOC11 IN XMLTYPE)
>
> IS
>
> SELECT EXTRACTVALUE (VALUE (T), '/ROW/SEC_DID') SEC_DID
>
> , EXTRACTVALUE (VALUE (T), '/ROW/SOURCE') SOURCE
>
> , EXTRACTVALUE (VALUE (T), '/ROW/DAYS') DAYS
>
> , EXTRACTVALUE (VALUE (T), '/ROW/OCCR') OCCR
>
> , EXTRACTVALUE (VALUE (T), '/ROW/SEC_POLICYDETAILSID') SEC_POLICYDETAILSID
>
> FROM TABLE (XMLSEQUENCE (EXTRACT (B_XMLDOC11, '//ROW'))) T;
>

depends on PostgreSQL version

last version has XMLTABLE - for older versions, you should to use XPATH
function probably

postgres=# select xmltable.* from data, lateral
xmltable('/TABLES/SEC_CALDAY/ROW' passing x columns sec_did int path
'SEC_DID', source text path 'SOURCE', days int path 'DAYS');
┌─────────┬────────┬──────┐
│ sec_did │ source │ days │
╞═════════╪════════╪══════╡
│ 123 │ TEXT │ 31 │
│ 456 │ TEXT │ 31 │
│ 789 │ TEXT │ 31 │
└─────────┴────────┴──────┘
(3 rows)

or

postgres=# select (xpath('/ROW/SEC_DID/text()', x2))[1],
(xpath('/ROW/SOURCE/text()', x2))[1] from ( select
unnest(xpath('/TABLES/SEC_CALDAY/ROW', x)) x2 FROM data) s;
┌───────┬───────┐
│ xpath │ xpath │
╞═══════╪═══════╡
│ 123 │ TEXT │
│ 456 │ TEXT │
│ 789 │ TEXT │
└───────┴───────┘
(3 rows)

>
> *Please let me know the corresponding parsing query in Postgresql.*
>
>
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