Java tutorial
/* * Copyright (c) 1995, 2011, Oracle and/or its affiliates. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Oracle or the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package com.oracle.tutorial.jdbc; import java.sql.BatchUpdateException; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Savepoint; import java.sql.Statement; import java.util.HashMap; import java.util.HashSet; import java.util.Map; import java.util.Set; public class CoffeesTable { private String dbName; private Connection con; private String dbms; public CoffeesTable(Connection connArg, String dbNameArg, String dbmsArg) { super(); this.con = connArg; this.dbName = dbNameArg; this.dbms = dbmsArg; } public void createTable() throws SQLException { String createString = "create table COFFEES " + "(COF_NAME varchar(32) NOT NULL, " + "SUP_ID int NOT NULL, " + "PRICE numeric(10,2) NOT NULL, " + "SALES integer NOT NULL, " + "TOTAL integer NOT NULL, " + "PRIMARY KEY (COF_NAME), " + "FOREIGN KEY (SUP_ID) REFERENCES SUPPLIERS (SUP_ID))"; Statement stmt = null; try { stmt = con.createStatement(); stmt.executeUpdate(createString); } catch (SQLException e) { JDBCTutorialUtilities.printSQLException(e); } finally { if (stmt != null) { stmt.close(); } } } public void populateTable() throws SQLException { Statement stmt = null; try { stmt = con.createStatement(); stmt.executeUpdate("insert into COFFEES " + "values('Colombian', 00101, 7.99, 0, 0)"); stmt.executeUpdate("insert into COFFEES " + "values('French_Roast', 00049, 8.99, 0, 0)"); stmt.executeUpdate("insert into COFFEES " + "values('Espresso', 00150, 9.99, 0, 0)"); stmt.executeUpdate("insert into COFFEES " + "values('Colombian_Decaf', 00101, 8.99, 0, 0)"); stmt.executeUpdate("insert into COFFEES " + "values('French_Roast_Decaf', 00049, 9.99, 0, 0)"); } catch (SQLException e) { JDBCTutorialUtilities.printSQLException(e); } finally { if (stmt != null) { stmt.close(); } } } public void updateCoffeeSales(HashMap<String, Integer> salesForWeek) throws SQLException { PreparedStatement updateSales = null; PreparedStatement updateTotal = null; String updateString = "update COFFEES " + "set SALES = ? where COF_NAME = ?"; String updateStatement = "update COFFEES " + "set TOTAL = TOTAL + ? where COF_NAME = ?"; try { con.setAutoCommit(false); updateSales = con.prepareStatement(updateString); updateTotal = con.prepareStatement(updateStatement); for (Map.Entry<String, Integer> e : salesForWeek.entrySet()) { updateSales.setInt(1, e.getValue().intValue()); updateSales.setString(2, e.getKey()); updateSales.executeUpdate(); updateTotal.setInt(1, e.getValue().intValue()); updateTotal.setString(2, e.getKey()); updateTotal.executeUpdate(); con.commit(); } } catch (SQLException e) { JDBCTutorialUtilities.printSQLException(e); if (con != null) { try { System.err.print("Transaction is being rolled back"); con.rollback(); } catch (SQLException excep) { JDBCTutorialUtilities.printSQLException(excep); } } } finally { if (updateSales != null) { updateSales.close(); } if (updateTotal != null) { updateTotal.close(); } con.setAutoCommit(true); } } public void modifyPrices(float percentage) throws SQLException { Statement stmt = null; try { stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE); ResultSet uprs = stmt.executeQuery("SELECT * FROM COFFEES"); while (uprs.next()) { float f = uprs.getFloat("PRICE"); uprs.updateFloat("PRICE", f * percentage); uprs.updateRow(); } } catch (SQLException e) { JDBCTutorialUtilities.printSQLException(e); } finally { if (stmt != null) { stmt.close(); } } } public void modifyPricesByPercentage(String coffeeName, float priceModifier, float maximumPrice) throws SQLException { con.setAutoCommit(false); Statement getPrice = null; Statement updatePrice = null; ResultSet rs = null; String query = "SELECT COF_NAME, PRICE FROM COFFEES " + "WHERE COF_NAME = '" + coffeeName + "'"; try { Savepoint save1 = con.setSavepoint(); getPrice = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); updatePrice = con.createStatement(); if (!getPrice.execute(query)) { System.out.println("Could not find entry for coffee named " + coffeeName); } else { rs = getPrice.getResultSet(); rs.first(); float oldPrice = rs.getFloat("PRICE"); float newPrice = oldPrice + (oldPrice * priceModifier); System.out.println("Old price of " + coffeeName + " is " + oldPrice); System.out.println("New price of " + coffeeName + " is " + newPrice); System.out.println("Performing update..."); updatePrice.executeUpdate( "UPDATE COFFEES SET PRICE = " + newPrice + " WHERE COF_NAME = '" + coffeeName + "'"); System.out.println("\nCOFFEES table after update:"); CoffeesTable.viewTable(con); if (newPrice > maximumPrice) { System.out.println("\nThe new price, " + newPrice + ", is greater than the maximum " + "price, " + maximumPrice + ". Rolling back the transaction..."); con.rollback(save1); System.out.println("\nCOFFEES table after rollback:"); CoffeesTable.viewTable(con); } con.commit(); } } catch (SQLException e) { JDBCTutorialUtilities.printSQLException(e); } finally { if (getPrice != null) { getPrice.close(); } if (updatePrice != null) { updatePrice.close(); } con.setAutoCommit(true); } } public void insertRow(String coffeeName, int supplierID, float price, int sales, int total) throws SQLException { Statement stmt = null; try { stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE); ResultSet uprs = stmt.executeQuery("SELECT * FROM COFFEES"); uprs.moveToInsertRow(); uprs.updateString("COF_NAME", coffeeName); uprs.updateInt("SUP_ID", supplierID); uprs.updateFloat("PRICE", price); uprs.updateInt("SALES", sales); uprs.updateInt("TOTAL", total); uprs.insertRow(); uprs.beforeFirst(); } catch (SQLException e) { JDBCTutorialUtilities.printSQLException(e); } finally { if (stmt != null) { stmt.close(); } } } public void batchUpdate() throws SQLException { Statement stmt = null; try { this.con.setAutoCommit(false); stmt = this.con.createStatement(); stmt.addBatch("INSERT INTO COFFEES " + "VALUES('Amaretto', 49, 9.99, 0, 0)"); stmt.addBatch("INSERT INTO COFFEES " + "VALUES('Hazelnut', 49, 9.99, 0, 0)"); stmt.addBatch("INSERT INTO COFFEES " + "VALUES('Amaretto_decaf', 49, 10.99, 0, 0)"); stmt.addBatch("INSERT INTO COFFEES " + "VALUES('Hazelnut_decaf', 49, 10.99, 0, 0)"); int[] updateCounts = stmt.executeBatch(); this.con.commit(); } catch (BatchUpdateException b) { JDBCTutorialUtilities.printBatchUpdateException(b); } catch (SQLException ex) { JDBCTutorialUtilities.printSQLException(ex); } finally { if (stmt != null) { stmt.close(); } this.con.setAutoCommit(true); } } public static void viewTable(Connection con) throws SQLException { Statement stmt = null; String query = "select COF_NAME, SUP_ID, PRICE, SALES, TOTAL from COFFEES"; try { stmt = con.createStatement(); ResultSet rs = stmt.executeQuery(query); while (rs.next()) { String coffeeName = rs.getString("COF_NAME"); int supplierID = rs.getInt("SUP_ID"); float price = rs.getFloat("PRICE"); int sales = rs.getInt("SALES"); int total = rs.getInt("TOTAL"); System.out.println(coffeeName + ", " + supplierID + ", " + price + ", " + sales + ", " + total); } } catch (SQLException e) { JDBCTutorialUtilities.printSQLException(e); } finally { if (stmt != null) { stmt.close(); } } } public static void alternateViewTable(Connection con) throws SQLException { Statement stmt = null; String query = "select COF_NAME, SUP_ID, PRICE, SALES, TOTAL from COFFEES"; try { stmt = con.createStatement(); ResultSet rs = stmt.executeQuery(query); while (rs.next()) { String coffeeName = rs.getString(1); int supplierID = rs.getInt(2); float price = rs.getFloat(3); int sales = rs.getInt(4); int total = rs.getInt(5); System.out.println(coffeeName + ", " + supplierID + ", " + price + ", " + sales + ", " + total); } } catch (SQLException e) { JDBCTutorialUtilities.printSQLException(e); } finally { if (stmt != null) { stmt.close(); } } } public Set<String> getKeys() throws SQLException { HashSet<String> keys = new HashSet<String>(); Statement stmt = null; String query = "select COF_NAME from COFFEES"; try { stmt = con.createStatement(); ResultSet rs = stmt.executeQuery(query); while (rs.next()) { keys.add(rs.getString(1)); } } catch (SQLException e) { JDBCTutorialUtilities.printSQLException(e); } finally { if (stmt != null) { stmt.close(); } } return keys; } public void dropTable() throws SQLException { Statement stmt = null; try { stmt = con.createStatement(); if (this.dbms.equals("mysql")) { stmt.executeUpdate("DROP TABLE IF EXISTS COFFEES"); } else if (this.dbms.equals("derby")) { stmt.executeUpdate("DROP TABLE COFFEES"); } } catch (SQLException e) { JDBCTutorialUtilities.printSQLException(e); } finally { if (stmt != null) { stmt.close(); } } } public static void main(String[] args) { JDBCTutorialUtilities myJDBCTutorialUtilities; Connection myConnection = null; if (args[0] == null) { System.err.println("Properties file not specified at command line"); return; } else { try { myJDBCTutorialUtilities = new JDBCTutorialUtilities(args[0]); } catch (Exception e) { System.err.println("Problem reading properties file " + args[0]); e.printStackTrace(); return; } } try { myConnection = myJDBCTutorialUtilities.getConnection(); // Java DB does not have an SQL create database command; it does require createDatabase // JDBCTutorialUtilities.createDatabase(myConnection, // myJDBCTutorialUtilities.dbName, // myJDBCTutorialUtilities.dbms); // // JDBCTutorialUtilities.initializeTables(myConnection, // myJDBCTutorialUtilities.dbName, // myJDBCTutorialUtilities.dbms); CoffeesTable myCoffeeTable = new CoffeesTable(myConnection, myJDBCTutorialUtilities.dbName, myJDBCTutorialUtilities.dbms); System.out.println("\nContents of COFFEES table:"); CoffeesTable.viewTable(myConnection); System.out.println("\nRaising coffee prices by 25%"); myCoffeeTable.modifyPrices(1.25f); System.out.println("\nInserting a new row:"); myCoffeeTable.insertRow("Kona", 150, 10.99f, 0, 0); CoffeesTable.viewTable(myConnection); System.out.println("\nUpdating sales of coffee per week:"); HashMap<String, Integer> salesCoffeeWeek = new HashMap<String, Integer>(); salesCoffeeWeek.put("Colombian", 175); salesCoffeeWeek.put("French_Roast", 150); salesCoffeeWeek.put("Espresso", 60); salesCoffeeWeek.put("Colombian_Decaf", 155); salesCoffeeWeek.put("French_Roast_Decaf", 90); myCoffeeTable.updateCoffeeSales(salesCoffeeWeek); CoffeesTable.viewTable(myConnection); System.out.println("\nModifying prices by percentage"); myCoffeeTable.modifyPricesByPercentage("Colombian", 0.10f, 9.00f); System.out.println("\nCOFFEES table after modifying prices by percentage:"); myCoffeeTable.viewTable(myConnection); System.out.println("\nPerforming batch updates; adding new coffees"); myCoffeeTable.batchUpdate(); myCoffeeTable.viewTable(myConnection); // System.out.println("\nDropping Coffee and Suplliers table:"); // // myCoffeeTable.dropTable(); // mySuppliersTable.dropTable(); } catch (SQLException e) { JDBCTutorialUtilities.printSQLException(e); } finally { JDBCTutorialUtilities.closeConnection(myConnection); } } }