Idea of conversion xml to sql

Question

Hi, I'm a student
I need to write a java program, which can convert any XML file to SQL database (i.e. MySQL, Postgres).
BUT
I don't have any idea, how to do that. Because XML files can be quite complex: i.e:
<a>
      <b>
              <c>
               Something here
              </c>
     </b>
</a>My idea is: <a > is table in database, <b > is column, and <c > ...... Exactly! WHAT TO DO with tags which deepth is greater than three?
Any suggestions? Plz help

Answer 1

Why do you wanna represent sql with xml? Do you wanna create an structure to do you queries more easily? i dont know if that's the best way out... but here's an ideia of how you could do it:
<sql>
<operation name="SELECT">
    <item>
        <table>table name</table>
        <field>field name</field>
    </item>
</operation>
<operation name="FROM">
    <item>
        <table>table name</table>
    </item>
</operation>
<operation name="WHERE">
    <item>
        <table>table name</table>
        <field>field name</field>
        <value>value of the field</value>
    </item>
    <item>
        <table>table name</table>
        <field>field name</field>
        <joinTable>the join table</joinTable>
        <joinField>the join field</joinField>
    <item>
</operation>
<operation name="ORDER BY">
</operation>
</sql>