SQL To XML - Complete Guide

SQL to XML converter transforms SQL query results into XML format. XML provides structured, self-describing data with schema validation capabilities. Essential for enterprise integration, SOAP services, and systems requiring strict data contracts.

How It Works

Each row becomes an XML element with child elements for columns. Root element wraps all rows. Column names become element names (sanitized for XML validity). Attributes can optionally hold metadata like types or nullability.

Technical Details

XML 1.0 spec requires valid element names (no spaces, must start with letter/underscore). Special characters (&, <, >, ", ') must be entity-encoded. Namespaces can provide schema context. CDATA sections wrap content with special characters.

Common Use Cases

1. Enterprise Integration: Exchange data with enterprise systems using XML.
2. SOAP Web Services: Generate XML for SOAP API requests/responses.
3. Configuration Export: Export database configuration as XML.
4. Document Generation: Create XML for document processing (XSLT transformation).

Code Examples

SQL to XML Conversion

function escapeXML(str) {
  if (str === null || str === undefined) return '';
  return String(str)
    .replace(/&/g, '&')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;')
    .replace(/'/g, '&apos;');
}

function sqlToXML(tableName, columns, rows) {
  let xml = '<?xml version="1.0" encoding="UTF-8"?>\n';
  xml += `<${tableName}s>\n`;

  rows.forEach(row => {
    xml += `  <${tableName}>\n`;
    columns.forEach((col, i) => {
      const value = row[i];
      if (value === null) {
        xml += `    <${col.name} xsi:nil="true"/>\n`;
      } else {
        xml += `    <${col.name}>${escapeXML(value)}</${col.name}>\n`;
      }
    });
    xml += `  </${tableName}>\n`;
  });

  xml += `</${tableName}s>`;
  return xml;
}

Wrap rows in elements, escape special characters, handle NULL with xsi:nil.

Tips & Best Practices

• Entity encode special characters
• Use valid XML element names
• Add XML declaration with encoding
• Consider namespaces for schema
• Use CDATA for complex content

Common Mistakes to Avoid

• Invalid element names from column names
• Not escaping special characters
• Missing XML declaration
• Inconsistent NULL handling

When to Use This Tool

Use SQL to XML for enterprise integration, SOAP services, document generation with XSLT, and systems requiring XML schema validation.

Frequently Asked Questions

How do I handle NULL values in XML?

Options: omit element, empty element (), xsi:nil attribute, or explicit value. xsi:nil="true" is XML Schema standard for NULL.

What about special characters?

Entity encode: & → &, < → <, > → >, " → ", ' → '. Or wrap in CDATA: for complex content.

How do I add namespaces?

Add xmlns attribute to root element. Use prefixes for elements: <db:row xmlns:db="http://example.com/db">. Namespaces enable schema validation.

Should I use elements or attributes?

Elements for data values (more flexible, can be complex). Attributes for metadata (id, type). Elements are generally preferred for database data.

Get Started

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Last updated: June 27, 2026