while (rs.next()) { String[] temp_array = {"","",""}; int prodid = rs.getint(1); temp_array[0] = ""+prodid;

Transcription

1 import java.sql.connection; import java.sql.drivermanager; import java.sql.resultset; import java.sql.sqlexception; import java.sql.statement; import java.util.arraylist; import java.util.scanner; public class MyDbAssessment static Connection con = null; static Statement stmt = null; static ResultSet rs = null; static Scanner in = new Scanner(System.in); public static void main(string[] args) init_db(); // open the connection to the database int choice = 0; while (choice!=6) printmainmenu(); if (in.hasnextint()) choice = in.nextint(); switch (choice) case 1: menuoption1(); case 2: menuoption2(); case 3: menuoption3(); case 4: ArrayList<String[]> productarray = new ArrayList(); rs = stmt.executequery("select * from product"); while (rs.next()) String[] temp_array = "","",""; int prodid = rs.getint(1); temp_array[0] = ""+prodid; String name = rs.getstring("name"); temp_array[1] = ""+name; String description = rs.getstring("description"); temp_array[2] = ""+description; productarray.add(temp_array);

2 records product"); System.out.println("Error: failed to get number of for(int i = 0; i < productarray.size(); i++) System.out.println("*********************************"); String name = productarray.get(i)[1]; String ID = productarray.get(i)[0]; String description = productarray.get(i)[2]; System.out.println("Product Name: "+name); System.out.println("Product ID: "+ID); System.out.println("Product Description: "+description); String[] partarray = "",""; partarray = gettotalandcost(id); System.out.println("Total Part Cost: "+partarray[0]); System.out.println("Total No. of Parts: "+partarray[1]); System.out.println("*********************************"); case 5: Scanner input = new Scanner(System.in); System.out.print("Enter Product Id: "); String product_id = input.next(); rs = stmt.executequery("select * from product WHERE prod_id = "+product_id+""); while (rs.next()) String prodname = rs.getstring("name"); System.out.println("*****************************************"); System.out.println("Parts and Parts Cost for: "+prodname); System.out.println("*****************************************"); database"); System.out.println("Error: failed to close the

3 = "+product_id+""); ArrayList<String[]> partarray = new ArrayList(); rs = stmt.executequery("select * from part WHERE prod_id while (rs.next()) String[] temp_array = "","","",""; int prodid = rs.getint(1); temp_array[0] = ""+prodid; String name = rs.getstring("name"); temp_array[1] = ""+name; String description = rs.getstring("description"); temp_array[2] = ""+description; String cost = rs.getstring("cost"); temp_array[3] = ""+cost; records product"); partarray.add(temp_array); System.out.println("Error: failed to get number of String[] partdata = "",""; partdata = gettotalandcost(product_id); for(int i = 0; i < partarray.size(); i++) String name = partarray.get(i)[1]; String ID = partarray.get(i)[0]; String description = partarray.get(i)[2]; String cost = partarray.get(i)[3]; System.out.println("Part Name: "+name); System.out.println("Part ID: "+ID); System.out.println("Part Description: "+description); System.out.println("Part Cost: "+cost); System.out.println("Total No. of Parts: "+partdata[1]); System.out.println("Total Cost of All Parts: "+partdata[0]); System.out.println("\n\nExiting System");

4 con.close(); System.out.println("Error: failed to close the database"); public static void menuoption2() int choice = 0; while (choice!=3) printoption2menu(); if (in.hasnextint()) choice = in.nextint(); switch (choice) case 1: System.out.print("Enter product id to be updated: "); String productid = in.next(); System.out.print("Do you want to change product name 'y' or 'n': "); String namechoice = in.next(); if (namechoice.equals("y")) System.out.print("Enter new name: "); String productnewname = in.next(); stmt.executeupdate("update product SET name='" +productnewname+ "' where prod_id="+productid+";"); // else if (namechoice.equals("n")) System.out.print("Do you want to change product description 'y' or 'n': "); String descchoice = in.next(); if (descchoice.equals("y")) System.out.print("Enter new description: "); String productnewdesc = in.next(); stmt.executeupdate("update product SET description='" +productnewdesc+ "' where prod_id="+productid+";"); else if (descchoice.equals("n")) else

5 or n! Menu Reset"); System.out.println("Invalid input. You must enter y case 2: //System.out.println("Call code to insert a part here"); displayparts(); System.out.print("Enter part id to be updated: "); String partid = in.next(); System.out.print("Do you want to change part name 'y' or 'n': "); String namechoice = in.next(); if (namechoice.equals("y")) System.out.print("Enter new part name: "); String partnewname = in.next(); stmt.executeupdate("update part SET name='" +partnewname+ "' where part_id="+partid+";"); else if (namechoice.equals("n")) System.out.print("Do you want to change part description 'y' or 'n': "); String descchoice = in.next(); if (descchoice.equals("y")) System.out.print("Enter new part description: "); String partnewdesc = in.next(); stmt.executeupdate("update part SET description='" +partnewdesc+ "' where part_id="+partid+";"); else if (descchoice.equals("n")) System.out.print("Do you want to change part price 'y' or 'n': "); String pricechoice = in.next(); if (pricechoice.equals("y")) System.out.print("Enter new part price: "); String partnewprice = in.next(); stmt.executeupdate("update part SET cost='" +partnewprice+ "' where part_id="+partid+";"); else if (pricechoice.equals("n"))

6 System.out.print("Do you want to change product id 'y' or 'n': "); String prodidchoice = in.next(); if (prodidchoice.equals("y")) System.out.print("Enter new product id: "); String partnewprodid = in.next(); stmt.executeupdate("update part SET prod_id='" +partnewprodid+ "' where part_id="+partid+";"); else if (prodidchoice.equals("n")) else System.out.println("Invalid input. You must enter y or n! Menu Reset"); else System.out.println("Invalid input. You must enter y or n! Menu Reset"); else System.out.println("Invalid input. You must enter y or n! Menu Reset"); else System.out.println("Invalid input. You must enter y or n! Menu Reset"); displayparts(); return; //test

7 public static void menuoption3() int choice = 0; while (choice!=3) printoption3menu(); if (in.hasnextint()) choice = in.nextint(); switch (choice) case 1: System.out.print("Enter product id to be deleted: "); String productid = in.next(); stmt.executeupdate("delete from part WHERE prod_id = "+productid+";"); stmt.executeupdate("delete from product WHERE prod_id = "+productid+";"); "+partid+";"); return; case 2: displayparts(); System.out.print("Enter part id to be deleted: "); String partid = in.next(); stmt.executeupdate("delete from part WHERE part_id = displayparts(); //test

8 public static void menuoption1() int choice = 0; while (choice!=3) printoption1menu(); if (in.hasnextint()) choice = in.nextint(); switch (choice) case 1: System.out.print("Enter name of product: "); String productname = in.next(); System.out.print("Enter description of product: "); String productdesc = in.next(); stmt.executeupdate("insert INTO product VALUES ( null, '" +productname+ "', '" +productdesc+ "')"); choice = 3; case 2: System.out.print("Enter name of part: "); String partname = in.next(); System.out.print("Enter description of part: "); String partdesc = in.next(); System.out.print("Enter cost of part(00.00): "); Float partcost = in.nextfloat(); System.out.print("Enter id of related product: "); int prodid = in.nextint(); stmt.executeupdate("insert INTO part VALUES ( null, '" +partname+ "', '" +partdesc+ "', '" +partcost+ "', '" +prodid+ "')"); displayparts(); choice = 3;

9 return; //test public static void displayproducts() rs = stmt.executequery("select * from product"); System.out.println("List of Products:"); while (rs.next()) int prodid = rs.getint(1); String name = rs.getstring("name"); String description = rs.getstring("description"); System.out.println(prodid + ": " + name + " " + description); System.out.println("Error: failed to get number of public static void displayparts() rs = stmt.executequery("select * from part"); System.out.println("List of Parts:"); while (rs.next()) int partid = rs.getint(1); String name = rs.getstring("name"); String description = rs.getstring("description"); String cost = rs.getstring("cost"); String prodid = rs.getstring("prod_id"); System.out.println("Part_Id: " + partid + ": " + name + " " + description+ " Cost: E" + cost + ": Product_Id:" + prodid); System.out.println("Error: failed to get number of public static void printmainmenu()

10 System.out.println("\t\tMain Menu"); System.out.println("1: Insert a new product or part"); System.out.println("2: Update an existing product or part"); System.out.println("3: Delete a product or part"); System.out.println("4: Output all products plus the number of parts and total parts cost"); System.out.println("5: Output a given product plus all its parts and parts cost"); System.out.println("6: Exit\n"); System.out.print("Enter choice: "); public static void printoption1menu() System.out.println("\t\tInsert New Record Menu"); System.out.println("1: Insert a new product"); System.out.println("2: Insert a new part"); System.out.println("3: Exit\n"); System.out.print("Enter choice: "); public static void printoption2menu() System.out.println("\t\tUpdate Record Menu"); System.out.println("1: Update a product"); System.out.println("2: Update a new part"); System.out.println("3: Exit\n"); System.out.print("Enter choice: "); public static void printoption3menu() System.out.println("\t\tDelete Record Menu"); System.out.println("1: Delete a product"); System.out.println("2: Delete a part"); System.out.println("3: Exit\n"); System.out.print("Enter choice: "); public static void init_db() Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); String url="jdbc:mysql://localhost:3306/jka "; con = DriverManager.getConnection(url, "root", "admin"); stmt = con.createstatement(); catch(exception e) System.out.println("Error: Failed to connect to database\n"+e.getmessage()); public static String[] gettotalandcost(string productarray)

11 String[] result = "",""; rs = stmt.executequery("select sum(cost) as totalcost,count(*) as totalparts from part where prod_id = "+productarray+""); rs.next(); String sum = rs.getstring("totalcost"); String cost = rs.getstring("totalparts"); result[0] = sum; result[1] = cost; catch (SQLException e) System.out.println("Error!"); return result;