Lab6 Assignment: Using Java to Write Database Queries Solution

$30.00

Description

The purpose of the following assignment is to practice connection to the database system using Java. If you have never used Java of never tried to establish connection to a database you might nd helpful to read the lab notes (part1 and part2).

To create initial table structure and load some data you may use the scripts from previous lab (lab5/ folder in lab6.zip). Once you initialize your database and verify that it is up and running continue with Exercises 1 and 2.

  1. Exercise 1 (SQL)

Write the following queries using the schema from the previous lab:

Find the total number of parts supplied by each supplier.

Find the total number of parts supplied by each supplier who supplies at least 3 parts.

For every supplier that supplies only green parts, print the name of the supplier and the total number of parts that he supplies.

For every supplier that supplies green part and red part, print the name of the supplier and the price of the most expensive part that he supplies.

  1. Exercise 2 (Java)

For the following exercise you need to download and unzip lab6.zip from iLearn.

To implement the queries in Java you will need to modify example le EmbeddedSQL.java. In order to run Java example you will also need

1

to have pg73jdbc3.jar le in the same directory. You can compile and run the example program by executing compile.sh script.

Implement the following queries in the methods Query1 to Query6 using the method QueryExample as an example (EmbeddedSQL.java):

Implement the 4 problems from Exercise 1

Implement the additional queries where \ ” represents a user’s

input:

{ Query 5: Find the name of parts with cost lower than \

{ Query 6: Find the address of the suppliers who supply \

(pname)

2