java xml解析大文件和db关系

Question

I have a 10+ MB xml file with consists of node(about 10K to 20K) with relations.

<.....>
<Emplyoyee>
    <name>Jack</name>
    <age>35</age>
    <supervisor></supervisor>
    <....>
</Emplyoyee>
<.....>
<.....>
<.....>
<Emplyoyee>
    <name>Smith</name>
    <age>20</age>
    <supervisor>Jack</supervisor>
    <....>
</Emplyoyee>
<.....>

Now, I want to parse this file and store all the details in DB with "Employee" table which has a field(ID) called "supervisorID". Until now I have tried to make a List of all the employees and then iterating the List for finding supervisor relation.

Please suggest me a memory efficient and faster way to do this. What libraries can I use to handle this type of problems.

Answer 1

You can convert data from XML file to Java Objects using JAXB and insert Java objects to database using Hibernate + JPA .
You can create 2 DTO
Emplyoyee - with all info about Emplyoyee (name, age, ...)
and
Emplyoyees with List<Emplyoyee> for JAXB unmarshalling

EDIT: WITHOUT JAXB and JPA

You can parse file using javascript and send SQL queries usinf Ajax

var xmlDoc = new ActiveXObject("MSXML.DOMDocument");  
xmlDoc.async = false;
xmlDoc.preserveWhiteSpace = true;
xmlDoc.load(pathToFile);
var nodes = xmlDoc.selectNodes("/Emplyoyee");  
for (var node = nodes.nextNode(); node != null; node = nodes.nextNode())
{
   // get another nodes, create SQL query and sent it to server usinj Ajax  
}

Answer 2

Look at MOXy framework provided by EclipseLink . It uses JAXB implementation behind the scenes in fact. But does also the ORM stuff with JPA .