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Chris Pollett >
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Source Code of the Native DatabaseDescription: In this deliverable, we implement our database design using JAVA. Reader can refer to Deliverable 3 for the architectural design. The following is the source code for a logical leaf node. It contains a leaf id, page number in which it resides, and the actual data:
public ThLeave(long id, int pagenum, String dat)
{
iD = id;
pageNum = pagenum;
data = dat;
}
Below is the logical Group node. It contain a node id, an attribute
which can be null, and a list of children in the ArrayList:
public class ThGroup implements IthNode
{
public long nodeId;
public ThAttributeNode attribute;
public ArrayList children;
Here is the structure of a document. It contains a reference to the
database subsystem where global states of the database is kept,
the document’s name, the logical pointer to the root of the XML
document’s tree, and the physical page that will be flushed to disk when the page is full:
public class ThXMLDoc
{
ThSystem subsys;
public String name = null;
public ThGroup root; //logical tree root
public ThPage rootPage;
}
A database can contain 0 to n documents (if storage is enough).
Following is the structure of a database. Its name is created from the
DML file. The hash table contains the XML documents create in this database:
public ThDB(String dbName)
{
name = new String(dbName);
docNames = new Hashtable();
dbUp = true;
}
The following is the structure for the Buffer Manager. It consists
of a hash table of pages in memory and it manages a free pages list.
Buffer Manager also maintains the least recently used ArrayList of page number.
public class ThBufferMgr implements Serializable{
public static int pSn = 0; //page serial number
public Hashtable bufferPool = new Hashtable(); //pages in buffer pool
public ArrayList freeList = new ArrayList();
public ArrayList leastRecentlyUse = new ArrayList();
public int totalPage = 20; //20 pages in the pool
}
Please refer to the Appendix for code details.
Following is the content of DML7.TXT:
CREATE DATABASE DB1DB;
CREATE XMLDOC XML1DOC IN DB1DB;
LOAD "c://an//cs297//xmldb//test1.xml"
INTO XML1DOC;
printTree(XML1DOC);
//* add to the end of first element of /G[1], /G[2], ...
INSERT INTO XML1DOC PATH("/G/G[1]") VALUES("<L>392 Lily Ann Way,
San Jose CA 95111</L>",
"<L>(408)123-1234</L>");
INSERT INTO XML1DOC PATH("/G/G[2]") VALUES("<L>123 No Name St.,
San Jose CA 95112</L>",
"<L>(408)123-1234</L>"); COMMIT;
INSERT INTO XML1DOC PATH("/G/G[3]") VALUES("<L>234 Bernal,
San Jose CA 95012</L>");
INSERT INTO XML1DOC PATH("/G/G[4]") VALUES("<L>555 Bailey Road,
San Jose CA 94091</L>");
INSERT INTO XML1DOC PATH("/G/G[5]") VALUES("<L>1234 1st street,
San Francisco CA 95012</L>",
<L>(510)344-1010</L>");
INSERT INTO XML1DOC PATH("/G/G[6]") VALUES("<L>2234 2st street,
Santa Rosa CA 94323</L>",
<L>(808)463-1203</L>");
INSERT INTO XML1DOC PATH("/G/G[7]") VALUES("<L>3542 3st street,
Santa monica CA 95002</L>",
<L>(808)463-1203</L>");
//* comments
printTree(XML1DOC);
DELETE FROM XML1DOC WHERE PATH("/G/G[4]");
DELETE FROM XML1DOC WHERE PATH("/G/G/L[4]", "/G/G/L[3]");
printTree(XML1DOC);
UPDATE XML1DOC SET VALUE("<L>392 Pasilo dr., San Jose CA 95123</L>")
WHERE PATH("/G/G/L[2]");
printTree(XML1DOC);
SELECT "/G[*]" FROM XML1DOC;
DROP XMLDOC XML1DOC;
DROP DATABASE DB1DB;
Following is the snapshot of running the above testcase:
testExecuteDML7()
System starting up...
Constructing transactiontable...
Sub-system is up
Parsing DML...
Executing DML Plan
DB1DB created
XML1DOC added in DB1DB
openning file: c://an//cs297//xmldb//test1.xml
Loading into XMLDoc...
Closing file: c://an//cs297//xmldb//test1.xml
Printing Logical structure of XML Tree: XML1DOC
ID=00000001
name=CS297
id=123-45-6789
Jane Eyre
3.8
id=234-56-7890
Irene Hugh
3.0
id=345-67-8901
Thomas Lee
2.8
id=456-78-9012
Erica Nguyen
3.1
id=567-45-6789
Rochester Thornfield
2.8
id=678-45-6789
John Lyle
3.2
id=789-00-6789
Robert Mulan
3.2
Inserting into XMLDoc...
Inserting into XMLDoc...
Inserting into XMLDoc...
Inserting into XMLDoc...
Inserting into XMLDoc...
Inserting into XMLDoc...
Inserting into XMLDoc...
Printing Logical structure of XML Tree: XML1DOC
ID=00000001
name=CS297
id=123-45-6789
Jane Eyre
3.8
392 Lily Ann Way, San Jose CA 95111
(408)123-1234
id=234-56-7890
Irene Hugh
3.0
123 No Name St., San Jose CA 95112
(408)123-1234
id=345-67-8901
Thomas Lee
2.8
234 Bernal, San Jose CA 95012
id=456-78-9012
Erica Nguyen
3.1
555 Bailey Road, San Jose CA 94091
id=567-45-6789
Rochester Thornfield
2.8
1234 1st street, San Francisco CA 95012
(510)344-1010
id=678-45-6789
John Lyle
3.2
2234 2st street, Santa Rosa CA 94323
(808)463-1203
id=789-00-6789
Robert Mulan
3.2
3542 3st street, Santa monica CA 95002
(808)463-1203
Deleting from XMLDoc...
Deleting from XMLDoc...
Printing Logical structure of XML Tree: XML1DOC
ID=00000001
name=CS297
id=123-45-6789
Jane Eyre
3.8
392 Lily Ann Way, San Jose CA 95111
(408)123-1234
id=234-56-7890
Irene Hugh
3.0
123 No Name St., San Jose CA 95112
(408)123-1234
id=678-45-6789
John Lyle
3.2
2234 2st street, Santa Rosa CA 94323
(808)463-1203
id=789-00-6789
Robert Mulan
3.2
3542 3st street, Santa monica CA 95002
(808)463-1203
Updating XML1DOC...
Printing Logical structure of XML Tree: XML1DOC
ID=00000001
name=CS297
id=123-45-6789
Jane Eyre
3.8
392 Lily Ann Way, San Jose CA 95111
(408)123-1234
392 Pasilo dr., San Jose CA 95123
id=678-45-6789
John Lyle
3.2
2234 2st street, Santa Rosa CA 94323
(808)463-1203
id=789-00-6789
Robert Mulan
3.2
3542 3st street, Santa monica CA 95002
(808)463-1203
Selecting from XMLDoc: XML1DOC
id=123-45-6789
Jane Eyre
3.8
392 Lily Ann Way, San Jose CA 95111
(408)123-1234
id=678-45-6789
John Lyle
3.2
2234 2st street, Santa Rosa CA 94323
(808)463-1203
id=789-00-6789
Robert Mulan
3.2
3542 3st street, Santa monica CA 95002
(808)463-1203
name=CS297
392 Pasilo dr., San Jose CA 95123
Time: 1.632
OK (5 tests)
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