5.2 KiB
5.2 KiB
PLJSON_XML
Package Specification
package pljson_xml as
/*
Copyright (c) 2010 Jonas Krogsboell
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
/*
declare
obj json := json('{a:1, b:[2, 3, 4], c:true}');
x xmltype;
begin
obj.print;
x := json_xml.json_to_xml(obj);
dbms_output.put_line(x.getclobval());
end;
*/
function json_to_xml(obj pljson, tagname varchar2 default 'root') return xmltype;
end pljson_xml;```
## Package Body
```sql
package body pljson_xml as
function escapeStr(str varchar2) return varchar2 as
buf varchar2(32767) := '';
ch varchar2(4);
begin
for i in 1 .. length(str) loop
ch := substr(str, i, 1);
case ch
when '&' then buf := buf || '&';
when '<' then buf := buf || '<';
when '>' then buf := buf || '>';
when '"' then buf := buf || '"';
else buf := buf || ch;
end case;
end loop;
return buf;
end escapeStr;
/* Clob methods from printer */
procedure add_to_clob(buf_lob in out nocopy clob, buf_str in out nocopy varchar2, str varchar2) as
begin
-- if (length(str) > 5000 - length(buf_str)) then
if (lengthb(str) > 32767 - lengthb(buf_str)) then
dbms_lob.append(buf_lob, buf_str);
buf_str := str;
else
buf_str := buf_str || str;
end if;
end add_to_clob;
procedure flush_clob(buf_lob in out nocopy clob, buf_str in out nocopy varchar2) as
begin
dbms_lob.append(buf_lob, buf_str);
end flush_clob;
procedure toString(obj pljson_element, tagname in varchar2, xmlstr in out nocopy clob, xmlbuf in out nocopy varchar2) as
v_obj pljson;
v_list pljson_list;
v_keys pljson_list;
v_value pljson_element;
key_str varchar2(4000);
begin
if (obj.is_object()) then
add_to_clob(xmlstr, xmlbuf, '<' || tagname || '>');
v_obj := pljson(obj);
v_keys := v_obj.get_keys();
for i in 1 .. v_keys.count loop
v_value := v_obj.get(i);
key_str := v_keys.get(i).get_string();
if (key_str = 'content') then
if (v_value.is_array()) then
declare
v_l pljson_list := pljson_list(v_value);
begin
for j in 1 .. v_l.count loop
if (j > 1) then add_to_clob(xmlstr, xmlbuf, chr(13)||chr(10)); end if;
add_to_clob(xmlstr, xmlbuf, escapeStr(v_l.get(j).to_char()));
end loop;
end;
else
add_to_clob(xmlstr, xmlbuf, escapeStr(v_value.to_char()));
end if;
elsif (v_value.is_array()) then
declare
v_l pljson_list := pljson_list(v_value);
begin
for j in 1 .. v_l.count loop
v_value := v_l.get(j);
if (v_value.is_array()) then
add_to_clob(xmlstr, xmlbuf, '<' || key_str || '>');
add_to_clob(xmlstr, xmlbuf, escapeStr(v_value.to_char()));
add_to_clob(xmlstr, xmlbuf, '</' || key_str || '>');
else
toString(v_value, key_str, xmlstr, xmlbuf);
end if;
end loop;
end;
elsif (v_value.is_null() or (v_value.is_string() and v_value.get_string() = '')) then
add_to_clob(xmlstr, xmlbuf, '<' || key_str || '/>');
else
toString(v_value, key_str, xmlstr, xmlbuf);
end if;
end loop;
add_to_clob(xmlstr, xmlbuf, '</' || tagname || '>');
elsif (obj.is_array()) then
v_list := pljson_list(obj);
for i in 1 .. v_list.count loop
v_value := v_list.get(i);
toString(v_value, nvl(tagname, 'array'), xmlstr, xmlbuf);
end loop;
else
add_to_clob(xmlstr, xmlbuf, '<' || tagname || '>'||case when obj.value_of() is not null then escapeStr(obj.value_of()) end ||'</' || tagname || '>');
end if;
end toString;
function json_to_xml(obj pljson, tagname varchar2 default 'root') return xmltype as
xmlstr clob := empty_clob();
xmlbuf varchar2(32767) := '';
returnValue xmltype;
begin
dbms_lob.createtemporary(xmlstr, true);
toString(obj, tagname, xmlstr, xmlbuf);
flush_clob(xmlstr, xmlbuf);
returnValue := xmltype('<?xml version="1.0"?>'||xmlstr);
dbms_lob.freetemporary(xmlstr);
return returnValue;
end;
end pljson_xml;```