Programming Forums > Application Development > Java

evronia · Nov 23rd, 2007, 6:11 PM

Heeey guys!
it's the first time for me to post a thread here..
I have a big dilemma and I need your help..
I have a project at uni about making a JDBC ..here it is :

Introduction
JDBC (Java Database Connectivity) is a standard SQL database access interface, which provides
uniform access to a wide range of relational databases. It also provides a common base on which
higher-level tools and interfaces can be built. Basically, JDBC performs the following operations:
• Establish a connection with a database or access any tabular data source.
• Send SQL statements.
• Process the results.

JDBC defines a set of main interfaces to handle the previous three steps
java.sql.Driver
java.sql.Connection
java.sql.Statement
java.sql.Resultset

The Driver interface handle requests for database connections, the Connection interface provide
means for accessing the specified database and querying it using standard SQL queries.
Each SQL query need to be passed to the connection through an object implements Statement
interface, the return value of the query will be stored in an object implements ResultSet
interface.

The following code snippet for a simple JDBC program.

(Toggle Plain Text)

// Step 1 : Establish the conenction
// First, loading the driver
Class drvClass = Class.forName(“oracle.jdbc.driver.OracleDriver”);
DriverManager.registerDriver((Driver) drvClass.newInstance());
// Second, making the connection
Connection m_con = DriverManager.getConnection(m_url, m_userName, m_password);
// Step 2: Send SQL statement
Statement stmt = m_con.createStatement();
ResultSet rs = stmt.executeUpdate("SELECT e_name, e_salary FROM employee");
// Step 3: Process the result
while (rs.next())
{
String s = rs.getString("e_name");
float n = rs.getFloat("e_salary");
System.out.println("Name: " + s + "\t Salary: " + n);
} // Close connection and release resources
stmt.close();
m_con.close();

Problem Statement
It is required to implement and XML JDBC deriver that access and XML database and make
some queries on it.
First you will need to implement a simple Database Management System ,DBMS, that handles
XML tables, it is let for you to specifies the structure of your XML tables. You will use SAX
parser in parsing the tables data.
Second, you will implement the JDBC four main interfaces; java.sql.Driver, java.sql.Connection,
java.sql.Statement and java.sql.Resultset.
You won't implement all methods of the previous interfaces, instead you will use adapter classes
to handle the unneeded functions for our driver as the following.
java.sql.Driver
Will be implemented with all its methods.
java.sql.Connection
Implement the following methods; close(), commit(), createStatement(), isClosed(),
isReadOnly(), setReadOnly(boolean readOnly).
java.sql.Statement
Implement the following methods; addBatch(String sql), clearBatch(), close(),
executeBatch(), executeQuery(String sql), executeUpdate(String sql), getConnection(),
getMaxRows(), getQueryTimeout(), getResultSet(), getUpdateCount(), setMaxRows(int
max), setQueryTimeout().
java.sql.Resultset
Implement the following methods; absolute(int row), afterLast(), beforeFirst(),
cancelRowUpdates(), close(), deleteRow(), findColumn(String columnName), first(),
getObject(int columnIndex), getObject(String columnName), getRow(), getStatement(),
insertRow(), isAfterLast(), isBeforeFirst(), isFirst(), isLast(), last(), moveToCurrentRow(),
moveToInsertRow(), next(), previous(), relative(int rows) , rowDeleted(), rowInserted(),
rowUpdated(), updateObject(int columnIndex), updateObject(String columnName)

The resultant JDBC of your implementation should be able to run code like given in the
previous example and similar codes that execute SQL quires.

Our proposed XML driver will support the following SQL statements:

(Toggle Plain Text)

INSERT INTO table [ column [,column, …. ]]
VALUES (value [,value, … ))
UPDATE table
SET column=value [ , column=value, .. ]
[WHERE condition]
DELETE table
[WHERE condition]
SELECT { * | column [,column, …. ] }
FROM table
WHERE condition

Any syntax errors or invalid statements should be rejected.
In your implementation you must have a general class for logging your different error,
warnings and messages. It is recommended to use Log4J project for logging

-------------------------------------------------------

now I need an example of an implementation of any of the functions coz I don't know where to start!!!

please this is urgent
thanks a lot

Evronia

Grich · Nov 25th, 2007, 6:16 PM

Do your own <snip> homework pal.

Infinite Recursion · Nov 27th, 2007, 8:48 AM

A verbatim copy-and-paste of your homework. Your lack of effort literally makes me sick.
If you can't come up with a simple set of code and post a specific question, then perhaps you should re-evaluate things.

Start here: google.com or your textbook.

I'm not doing your homework for you unless I can have your diploma/degree, since afterall, I am the one who will be earning it.

casesensitive · Nov 27th, 2007, 9:48 AM

http://www.w3schools.com/sql/default.asp
Best place to start is by learning the basics http://www.kitebird.com/articles/jdbc.html
http://java.sun.com/docs/books/tutorial/
Sorry I like throwing links out there. BTW does it pay to do your homework? I would love to afford to go to college to "learn" this stuff also. Send me an e-mail to how much it pays and I'll tell you if it's worth anymore of my time.

Harakim · Nov 27th, 2007, 5:04 PM

If you give clearer specifications, I could guide you in the right direction. What is your "database" going to look like? If you could give a sample, that would help. I have never used an "xml database".

casesensitive · Nov 28th, 2007, 4:28 AM

Quote:

Originally Posted by Harakim

If you give clearer specifications, I could guide you in the right direction. What is your "database" going to look like? If you could give a sample, that would help. I have never used an "xml database".

I think he already told us everything he knew. His class assignment word for word.

Nov 23rd, 2007, 6:11 PM	#1
evronia Newbie Join Date: Jun 2007 Posts: 1 Rep Power: 0	Jdbc Heeey guys! it's the first time for me to post a thread here.. I have a big dilemma and I need your help.. I have a project at uni about making a JDBC ..here it is : Introduction JDBC (Java Database Connectivity) is a standard SQL database access interface, which provides uniform access to a wide range of relational databases. It also provides a common base on which higher-level tools and interfaces can be built. Basically, JDBC performs the following operations: • Establish a connection with a database or access any tabular data source. • Send SQL statements. • Process the results. JDBC defines a set of main interfaces to handle the previous three steps java.sql.Driver java.sql.Connection java.sql.Statement java.sql.Resultset The Driver interface handle requests for database connections, the Connection interface provide means for accessing the specified database and querying it using standard SQL queries. Each SQL query need to be passed to the connection through an object implements Statement interface, the return value of the query will be stored in an object implements ResultSet interface. The following code snippet for a simple JDBC program. (Toggle Plain Text) // Step 1 : Establish the conenction // First, loading the driver Class drvClass = Class.forName(“oracle.jdbc.driver.OracleDriver”); DriverManager.registerDriver((Driver) drvClass.newInstance()); // Second, making the connection Connection m_con = DriverManager.getConnection(m_url, m_userName, m_password); // Step 2: Send SQL statement Statement stmt = m_con.createStatement(); ResultSet rs = stmt.executeUpdate("SELECT e_name, e_salary FROM employee"); // Step 3: Process the result while (rs.next()) { String s = rs.getString("e_name"); float n = rs.getFloat("e_salary"); System.out.println("Name: " + s + "\t Salary: " + n); } // Close connection and release resources stmt.close(); m_con.close(); // Step 1 : Establish the conenction // First, loading the driver Class drvClass = Class.forName(“oracle.jdbc.driver.OracleDriver”); DriverManager.registerDriver((Driver) drvClass.newInstance()); // Second, making the connection Connection m_con = DriverManager.getConnection(m_url, m_userName, m_password); // Step 2: Send SQL statement Statement stmt = m_con.createStatement(); ResultSet rs = stmt.executeUpdate("SELECT e_name, e_salary FROM employee"); // Step 3: Process the result while (rs.next()) { String s = rs.getString("e_name"); float n = rs.getFloat("e_salary"); System.out.println("Name: " + s + "\t Salary: " + n); } // Close connection and release resources stmt.close(); m_con.close(); Problem Statement It is required to implement and XML JDBC deriver that access and XML database and make some queries on it. First you will need to implement a simple Database Management System ,DBMS, that handles XML tables, it is let for you to specifies the structure of your XML tables. You will use SAX parser in parsing the tables data. Second, you will implement the JDBC four main interfaces; java.sql.Driver, java.sql.Connection, java.sql.Statement and java.sql.Resultset. You won't implement all methods of the previous interfaces, instead you will use adapter classes to handle the unneeded functions for our driver as the following. java.sql.Driver Will be implemented with all its methods. java.sql.Connection Implement the following methods; close(), commit(), createStatement(), isClosed(), isReadOnly(), setReadOnly(boolean readOnly). java.sql.Statement Implement the following methods; addBatch(String sql), clearBatch(), close(), executeBatch(), executeQuery(String sql), executeUpdate(String sql), getConnection(), getMaxRows(), getQueryTimeout(), getResultSet(), getUpdateCount(), setMaxRows(int max), setQueryTimeout(). java.sql.Resultset Implement the following methods; absolute(int row), afterLast(), beforeFirst(), cancelRowUpdates(), close(), deleteRow(), findColumn(String columnName), first(), getObject(int columnIndex), getObject(String columnName), getRow(), getStatement(), insertRow(), isAfterLast(), isBeforeFirst(), isFirst(), isLast(), last(), moveToCurrentRow(), moveToInsertRow(), next(), previous(), relative(int rows) , rowDeleted(), rowInserted(), rowUpdated(), updateObject(int columnIndex), updateObject(String columnName) The resultant JDBC of your implementation should be able to run code like given in the previous example and similar codes that execute SQL quires. Our proposed XML driver will support the following SQL statements: (Toggle Plain Text) INSERT INTO table [ column [,column, …. ]] VALUES (value [,value, … )) UPDATE table SET column=value [ , column=value, .. ] [WHERE condition] DELETE table [WHERE condition] SELECT { * \| column [,column, …. ] } FROM table WHERE condition INSERT INTO table [ column [,column, …. ]] VALUES (value [,value, … )) UPDATE table SET column=value [ , column=value, .. ] [WHERE condition] DELETE table [WHERE condition] SELECT { * \| column [,column, …. ] } FROM table WHERE condition Any syntax errors or invalid statements should be rejected. In your implementation you must have a general class for logging your different error, warnings and messages. It is recommended to use Log4J project for logging ------------------------------------------------------- now I need an example of an implementation of any of the functions coz I don't know where to start!!! please this is urgent thanks a lot Evronia Last edited by DaWei; Nov 23rd, 2007 at 9:29 PM. Reason: Added code tags. Read the rules.

Nov 25th, 2007, 6:16 PM	#2
Grich Hobbyist Programmer Join Date: Sep 2007 Location: Sydney - Australia Posts: 150 Rep Power: 1	Re: Jdbc Do your own <snip> homework pal. __________________ SYNTAX ERROR ... Last edited by Ancient Dragon; Nov 28th, 2007 at 8:16 AM. Reason: snipped cursing

Nov 27th, 2007, 8:48 AM	#3
Infinite Recursion Programming Guru Join Date: Jul 2004 Location: United States Posts: 3,466 Rep Power: 8	Re: Jdbc A verbatim copy-and-paste of your homework. Your lack of effort literally makes me sick. If you can't come up with a simple set of code and post a specific question, then perhaps you should re-evaluate things. Start here: google.com or your textbook. I'm not doing your homework for you unless I can have your diploma/degree, since afterall, I am the one who will be earning it. __________________ http://jasonpowers.net "There are a thousand hacking at the branches of evil to one who is striking at the root."

Nov 27th, 2007, 9:48 AM	#4
casesensitive Newbie Join Date: Oct 2007 Posts: 26 Rep Power: 0	Re: Jdbc http://www.w3schools.com/sql/default.asp Best place to start is by learning the basics http://www.kitebird.com/articles/jdbc.html http://java.sun.com/docs/books/tutorial/ Sorry I like throwing links out there. BTW does it pay to do your homework? I would love to afford to go to college to "learn" this stuff also. Send me an e-mail to how much it pays and I'll tell you if it's worth anymore of my time. Last edited by casesensitive; Nov 27th, 2007 at 10:01 AM.

Nov 27th, 2007, 5:04 PM	#5
Harakim Hobbyist Programmer Join Date: May 2006 Location: West Jordan, Utah, United States Posts: 176 Rep Power: 3	Re: Jdbc If you give clearer specifications, I could guide you in the right direction. What is your "database" going to look like? If you could give a sample, that would help. I have never used an "xml database".

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