How to Convert Xml to Json In Oracle in 2024?

To convert XML to JSON in Oracle, you can use the XMLTABLE function to first convert the XML data into relational format, and then use the JSON_OBJECT and JSON_ARRAY functions to construct the JSON output. You can also use the XMLSerialize function to serialize the XML data into a string format and then use the PL/SQL JSON package to convert the string into JSON format. Additionally, you can use the XQUERY function to extract data from the XML and structure it into JSON format. Overall, there are multiple ways to convert XML to JSON in Oracle depending on the complexity of the XML structure and the desired JSON output format.

What are the differences between XML and JSON data types in Oracle?

Syntax:

XML: XML data is hierarchical and uses tags to define the structure of the data. Tags are enclosed in angle brackets (). It is typically used for representing structured data.
JSON: JSON data is represented as key-value pairs and uses curly braces ({}) to define objects. It is more lightweight and easier to read compared to XML. It is commonly used for transmitting data between a server and web application.

Data Structure:

XML: XML data is stored as a tree structure with nested elements that can have attributes and child elements.
JSON: JSON data is stored as a simple list of key-value pairs or arrays. It does not support attributes like XML.

Schema:

XML: XML data can be validated against a schema document written in XML Schema Definition (XSD) or Document Type Definition (DTD).
JSON: JSON does not have a formal schema language, but JSON Schema can be used to define and validate the structure of JSON data.

Data Size:

XML: XML data is typically larger in size compared to JSON data due to its verbose syntax.
JSON: JSON data is more compact and smaller in size compared to XML, making it more efficient for data transmission over the internet.

Performance:

XML: XML processing can be slower and more resource-intensive compared to JSON due to its complex structure and parsing requirements.
JSON: JSON processing is faster and more efficient, making it a better choice for performance-critical applications.

Overall, both XML and JSON have their own advantages and use cases. XML is more suitable for representing complex and structured data while JSON is better for lightweight data exchange and web applications. Oracle supports both XMLType and JSON data types for storing and querying structured data.

What is the best approach to convert XML to JSON in Oracle?

One approach to convert XML to JSON in Oracle is to use the JSON_OBJECT function, which allows you to create a JSON object from the attributes and values in an XML document. You can also use the XMLTable function to extract the data from the XML and convert it into a JSON format.

Here is an example of how to convert XML to JSON in Oracle using the XMLTable function:

SELECT JSON_OBJECT(*) AS json_data
FROM XMLTable('/root/*'
      PASSING XMLType(
          '<root>
              <name>John</name>
              <age>30</age>
              <city>New York</city>
          </root>'
      )
      COLUMNS
          name VARCHAR2(50) PATH 'name',
          age NUMBER PATH 'age',
          city VARCHAR2(50) PATH 'city'
);

This query will convert the XML document into a JSON object with attributes for name, age, and city. You can customize the query to match the structure of your XML document and extract the data you need.

Another option is to use the XMLSerialize function to convert the XML document into a string and then use the JSON_OBJECT function to convert the string into a JSON object:

SELECT JSON_OBJECT(*) AS json_data
FROM 
(
    SELECT XMLSerialize(content MY_XML IN XMLTYPE AS  CLOB) AS xml_str
    FROM 
    (
        SELECT XMLType('<root><name>John</name><age>30</age><city>New York</city></root>') AS MY_XML
    )
)

These are just a few examples of how you can convert XML to JSON in Oracle. The best approach will depend on the structure of your XML document and the specific requirements of your project.

How to handle nested elements when converting XML to JSON in Oracle?

When converting XML to JSON in Oracle, you can handle nested elements by using the JSON_ARRAYAGG and JSON_OBJECT functions.

Here's an example of how you can convert nested elements in XML to a JSON format in Oracle:

Start by using the XMLTABLE function to extract the nested elements from the XML document. For example:

SELECT x.*
FROM XMLTABLE('/root/parent' PASSING XMLType('
    <root>
        <parent>
            <child>
                <name>John</name>
                <age>25</age>
            </child>
        </parent>
    </root>')
    COLUMNS
        name VARCHAR2(100) PATH 'child/name',
        age NUMBER PATH 'child/age'
) x;

Next, use the JSON_ARRAYAGG function to aggregate the nested elements into an array and the JSON_OBJECT function to create a JSON object for each nested element. For example:

SELECT JSON_OBJECT(
    'name' VALUE name,
    'age' VALUE age
)
FROM (
    SELECT x.*
    FROM XMLTABLE('/root/parent' PASSING XMLType('
        <root>
            <parent>
                <child>
                    <name>John</name>
                    <age>25</age>
                </child>
            </parent>
        </root>')
        COLUMNS
            name VARCHAR2(100) PATH 'child/name',
            age NUMBER PATH 'child/age'
    ) x
);

Finally, use the JSON_ARRAYAGG function to aggregate the JSON objects into a JSON array. For example:

SELECT JSON_ARRAYAGG(
    JSON_OBJECT(
        'name' VALUE name,
        'age' VALUE age
    )
)
FROM (
    SELECT x.*
    FROM XMLTABLE('/root/parent' PASSING XMLType('
        <root>
            <parent>
                <child>
                    <name>John</name>
                    <age>25</age>
                </child>
            </parent>
        </root>')
        COLUMNS
            name VARCHAR2(100) PATH 'child/name',
            age NUMBER PATH 'child/age'
    ) x
);

This will convert the nested elements in the XML document to a JSON array with each element represented as a JSON object.