MS Access中删除记录的问题。它在打印堆栈跟踪时显示此错误 net.ucanaccess.jdbc.UcanaccessSQLException：UCAExc ::: 3.0.1用户缺少未找到的权限或对象：PHONE at net.ucanaccess.jdbc.UcanaccessStatement.executeUpdate（UcanaccessStatement.java:222） at thirdTier.GeneralDBAccess.delete（GeneralDBAccess.java:223） at secondTier.DataStorage.deleteConfirmed（DataStorage.java:79） 在firstTier.UserInterface.begin（UserInterface.java:124） 在firstTier.ItemDriver.main（ItemDriver.java:16） 引起：java.sql.SQLSyntaxErrorException：用户缺少未找到的权限或对象：PHONE 在org.hsqldb.jdbc.JDBCUtil.sqlException（未知来源） 在org.hsqldb.jdbc.JDBCUtil.sqlException（未知来源） 在org.hsqldb.jdbc.JDBCStatement.fetchResult（未知来源） at org.hsqldb.jdbc.JDBCStatement.executeUpdate（未知来源） at net.ucanaccess.jdbc.ExecuteUpdate.executeWrapped（ExecuteUpdate.java:67） at net.ucanaccess.jdbc.AbstractExecute.executeBase（AbstractExecute.java:152） at net.ucanaccess.jdbc.ExecuteUpdate.execute（ExecuteUpdate.java:50） at net.ucanaccess.jdbc.UcanaccessStatement.executeUpdate（UcanaccessStatement.java:220） ......还有4个 引起：org.hsqldb.HsqlException：用户缺少未找到的权限或对象：PHONE 在org.hsqldb.error.Error.error（未知来源） 在org.hsqldb.error.Error.error（未知来源） 在org.hsqldb.ExpressionColumn.checkColumnsResolved（未知来源） 在org.hsqldb.ParserDML.compileDeleteStatement（未知来源） 在org.hsqldb.ParserCommand.compilePart（未知来源） 在org.hsqldb.ParserCommand.compileStatements（未知来源） at org.hsqldb.Session.executeDirectStatement（未知来源） 在org.hsqldb.Session.execute（未知来源） ......还有10个
我的用户界面
包firstTier;
导入javax.swing.JOptionPane;
导入例外。*;
import java.sql。*;
import secondTier。*;
public class UserInterface {
public void begin(){
//create a data storage
DataStorage product =new DataStorage();
//display the menu and process phone & simcard
boolean finished = false;
// open file before anything else is done
try {
ItemWorker.initialize();
product.getAll();
JOptionPane.showMessageDialog (null, "\n** Database successfully opened **\n", "Success", JOptionPane.PLAIN_MESSAGE);
}
catch (SQLException se){
JOptionPane.showMessageDialog(null, "\n**** ERROR: Problem opening database ****\n" + se.getMessage(), "ERROR", JOptionPane.ERROR_MESSAGE);
finished = true;
}
catch (ClassNotFoundException cnfe){
JOptionPane.showMessageDialog(null, "\n** ERROR: Cannot find database **\n", "ERROR", JOptionPane.ERROR_MESSAGE);
finished = true;
}
if (finished){
JOptionPane.showMessageDialog(null, "\n*** Fatal ERROR - Program Ended ***\n" +
"\n*** Please contact you computer services centre ***\n", "ERROR", JOptionPane.ERROR_MESSAGE);
}else {
try {
product.sort();
}
catch (ClassCastException cce){
JOptionPane.showMessageDialog (null, "Data not sorted properly", "Sorting Error", JOptionPane.INFORMATION_MESSAGE);
}
}
while (!finished){
int selection = showMenu();
switch (selection){
case 1: try {
product.add(addPhone());
product.sort();
}
catch (DuplicateException de){
JOptionPane.showMessageDialog (null, "ERROR: Cannot add Phone - key already exists in database!", "ERROR", JOptionPane.ERROR_MESSAGE);
}
catch (SQLException se){
JOptionPane.showMessageDialog (null, "ERROR: Problem with database - cannot add record!", "ERROR", JOptionPane.ERROR_MESSAGE);
}
break;
case 2: try {
product.add(addSimCard());
product.sort();
}
catch (DuplicateException de){
JOptionPane.showMessageDialog (null, "ERROR: Cannot add SimCard - key already exists in database!", "ERROR", JOptionPane.ERROR_MESSAGE);
}
catch (SQLException se){
JOptionPane.showMessageDialog (null, "ERROR: Problem with database - cannot add record!", "ERROR", JOptionPane.ERROR_MESSAGE);
}
break;
case 3: String phoneID = JOptionPane.showInputDialog(null, "What is the Phone ID?", "Phone Enquiry", JOptionPane.INFORMATION_MESSAGE);
int index = product.find (new Phone (phoneID.trim()));
if (index < 0){
JOptionPane.showMessageDialog(null, "Phone not Found - please check Item Code", "Not Found", JOptionPane.INFORMATION_MESSAGE);
}else {
JOptionPane.showMessageDialog(null, "The Phone Details are: \n\n" + product.get(index) + "\n", "Item Details", JOptionPane.PLAIN_MESSAGE);
}
break;
case 4: String simcardID = JOptionPane.showInputDialog(null, "What is the Simcard ID?", "Sim Card Enquiry", JOptionPane.INFORMATION_MESSAGE);
int index1 = product.find (new SimCard (simcardID.trim()));
if (index1 < 0){
JOptionPane.showMessageDialog(null, "Sim Card not Found - please check Item Code", "Not Found", JOptionPane.INFORMATION_MESSAGE);
}else {
JOptionPane.showMessageDialog(null, "The Phone Details are: \n\n" + product.get(index1) + "\n", "Item Details", JOptionPane.PLAIN_MESSAGE);
}
break;
case 5: phoneID = JOptionPane.showInputDialog (null, "What is the Item Code?", "Phone Enquiry", JOptionPane.INFORMATION_MESSAGE);
try {
Phone p = (Phone) product.delete (new Phone (phoneID.trim()));
int respone = JOptionPane.showConfirmDialog(null, p + "\nAre you sure want to delete this record?\n", "Confirm Delete?", JOptionPane.YES_NO_OPTION);
if (respone == JOptionPane.YES_OPTION){
try{
product.deleteConfirmed (product.find (p));
product.sort();
}
catch (NotFoundException nfe){
JOptionPane.showMessageDialog(null, "Phone not found - please check Item Code", "Not Found", JOptionPane.INFORMATION_MESSAGE);
}
catch (SQLException se){
se.printStackTrace();
}
}else {
JOptionPane.showMessageDialog(null, "The Phone Record has NOT been Deleted", "Not Deleted", JOptionPane.INFORMATION_MESSAGE);
}
}
catch (NotFoundException nfe){
JOptionPane.showMessageDialog (null, "Phone not found - please check Item Code", "Not Found", JOptionPane.INFORMATION_MESSAGE);
}
break;
case 6: simcardID = JOptionPane.showInputDialog (null, "What is the Item Code?", "Sim Card Enquiry", JOptionPane.INFORMATION_MESSAGE);
try {
SimCard s = (SimCard) product.delete (new SimCard (simcardID.trim()));
int respone = JOptionPane.showConfirmDialog(null, s + "\nAre you sure want to delete this record?\n", "Confirm Delete?", JOptionPane.YES_NO_OPTION);
if (respone == JOptionPane.YES_OPTION){
try{
product.deleteConfirmed (product.find (s));
product.sort();
}
catch (NotFoundException nfe){
JOptionPane.showMessageDialog(null, "Sim Card not found - please check Item Code", "Not Found", JOptionPane.INFORMATION_MESSAGE);
}
catch (SQLException se){
se.printStackTrace();
}
}else {
JOptionPane.showMessageDialog(null, "The Sim Card Record has NOT been Deleted", "Not Deleted", JOptionPane.INFORMATION_MESSAGE);
}
}
catch (NotFoundException nfe){
JOptionPane.showMessageDialog (null, "Sim Card not found - please check Item Code", "Not Found", JOptionPane.INFORMATION_MESSAGE);
}
break;
case 7: phoneID = JOptionPane.showInputDialog (null, "What is the Phone's ID code?", "Phone Enquiry", JOptionPane.INFORMATION_MESSAGE);
try {
Phone p = (Phone) product.update (new Phone (phoneID.trim()));
int response = JOptionPane.showConfirmDialog (null, p + "\nAre you sure you wish to update this record?\n", "Confirm Update?", JOptionPane.YES_NO_OPTION);
if (response == JOptionPane.YES_OPTION) {
try {
product.updateConfirmed (product.find (p));
product.sort(); // updating shouldn't alter the order, but sort it just in case!!
} catch (NotFoundException nfe) {
JOptionPane.showMessageDialog (null, "Phone not found - please check Phone's ID code", "Not Found", JOptionPane.INFORMATION_MESSAGE);
} catch (SQLException se) {
se.printStackTrace();
}
} else {
// Phone record not updated
JOptionPane.showMessageDialog (null, "The Phone Record has NOT been Updated", "Not Updated", JOptionPane.INFORMATION_MESSAGE);
}
} catch (NotFoundException nfe){
JOptionPane.showMessageDialog (null, "Phone not found - please check Phone ID Code", "Not Found", JOptionPane.INFORMATION_MESSAGE);
}
break;
case 8: JOptionPane.showMessageDialog (null, "This option is not yet available");
break;
case 9: JOptionPane.showMessageDialog(null, "Displaying the item information ...", "Item List", JOptionPane.PLAIN_MESSAGE);
for (int i=0; i<product.size(); i++){
JOptionPane.showMessageDialog(null, product.get(i), "Item Details", JOptionPane.PLAIN_MESSAGE);
}
break;
case 10: finished = true;
try{
ItemWorker.terminate();
JOptionPane.showMessageDialog(null, " ** Database successfully closed **", "All OK", JOptionPane.INFORMATION_MESSAGE);
}
catch (SQLException se){
JOptionPane.showMessageDialog(null, "ERROR: Database not closed correctly", "ERROR", JOptionPane.ERROR_MESSAGE);
}
JOptionPane.showMessageDialog(null, " *** Program Ended ***\n Have a nice day!");
break;
default: JOptionPane.showMessageDialog(null, "\n** Invalid Selection **\n", "ERROR", JOptionPane.ERROR_MESSAGE);
}//end switch
}//end while loop
}//end begin
public int showMenu(){
int selection = 0;
try{
String stringSelection = JOptionPane.showInputDialog(
"******* MENU *******\n\n" +
"1. Add a new Phone\n" +
"2. Add a new Sim Card\n" +
"3. Find Individual Phone's Details\n" +
"4. Find Individual Sim Card's Details\n" +
"5. Delete a Phone data\n" +
"6. Delete a Sim Card data\n" +
"7. Update Phone data\n" +
"8. Update Sim Card data\n" +
"9. Display all Details\n" +
"10. Exit Program\n\n" +
"Type the number of your selection, and click OK: ");
selection = Integer.parseInt(stringSelection.trim());
return selection;
}
catch (Exception e){
selection = 20;
}
return selection;
}// end showMenu()
public SimCard addSimCard (){
SimCard s = new SimCard();
// validate
String sId = JOptionPane.showInputDialog (null, "What is the Sim Card ID?").trim().toUpperCase();
s.setSimcardId (sId);
String ic = (JOptionPane.showInputDialog(null, "\nWhat is the item code of the product?")).trim().toUpperCase();
//trim() gets rid of leading & trailing whitesapce
s.setItemCode (ic);
//get their item code
String iCode = extractItemCode (ic);
String categories = null;
categories = JOptionPane.showInputDialog (null, "Add category of this " +iCode+ "?").trim();
int quantity = 0;
do{ // range - 0 to 99999
String stringiQuantity = JOptionPane.showInputDialog (null, "What is the quantity of this "+iCode+ "?");
int intQuantity = Integer.parseInt(stringiQuantity);
quantity = s.setQuantity ((int)intQuantity);
if (quantity <= 0 && quantity > 9999){
JOptionPane.showMessageDialog (null, "Error - PhoneNo must be greater than 0 and less than 99999999", "ERROR", JOptionPane.ERROR_MESSAGE);
}
}
while (quantity <= 0 && quantity > 9999);
double price = 0.0;
price = Double.parseDouble(JOptionPane.showInputDialog ("What is the price of this "+ic+ "?").trim());
String br_String = null;
do{//validate input if type in wrong
br_String = JOptionPane.showInputDialog ("This " +iCode+ " service provider is (Telstra, Optus, Vodaphone)").trim();
if (!br_String.equals ("Telstra") && !br_String.equals("Optus")
&& !br_String.equals ("Vodaphone")){
JOptionPane.showMessageDialog (null, "Error - Sim Card must be Telstra, Optus, Vodaphone", "ERROR", JOptionPane.ERROR_MESSAGE);
}
}
while (!br_String.equals ("Telstra") && !br_String.equals("Optus")
&& !br_String.equals ("Vodaphone"));
String expiryDate = null;
expiryDate = JOptionPane.showInputDialog ("When is the expiry date of this " +iCode+ "?").trim();
int num = 0;
do{
String stringiNumber = JOptionPane.showInputDialog ("What is the number of this " +iCode+ "?");
int intNum = Integer.parseInt(stringiNumber);
num = s.setQuantity ((int)intNum);
if (num < 0){
JOptionPane.showMessageDialog (null, "Error - value must be 0 or more", "Error", JOptionPane.ERROR_MESSAGE);
}
}
while (num < 0);
SimCard s1 = new SimCard(ic, categories , (int)quantity, (double)price, br_String, expiryDate, (int)num, sId);
return s1;
}
public Phone addPhone(){
Phone p = new Phone();
// validate what we can as we go
String pId = JOptionPane.showInputDialog (null, "What is the Phone ID?").trim().toUpperCase();
p.setPhoneId (pId);
String ic = (JOptionPane.showInputDialog(null, "\nWhat is the item code of the product?")).trim().toUpperCase();
//trim() gets rid of leading & trailing whitesapce
p.setItemCode (ic);
//get their item code
String iCode = extractItemCode (ic);
String categories = null;
categories = JOptionPane.showInputDialog (null, "Add category of this " +iCode+ "?").trim();
int quantity = 0;
do{ // range - 0 to 9999
String stringiQuantity = JOptionPane.showInputDialog (null, "What is the quantity of this "+iCode+ "?");
int intQuantity = Integer.parseInt(stringiQuantity);
quantity = p.setQuantity ((int)intQuantity);
if (quantity <= 0 && quantity > 9999){
JOptionPane.showMessageDialog (null, "Error - PhoneNo must be greater than 0 and less than 99999999", "ERROR", JOptionPane.ERROR_MESSAGE);
}
}
while (quantity <= 0 && quantity > 9999);
double price = 0.0;
price = Double.parseDouble(JOptionPane.showInputDialog ("What is the price of this "+iCode+ "?").trim());
String pType = null;
do{//validate input if type in wrong
pType = JOptionPane.showInputDialog (null, "What is the brand of this " +iCode+ "(Samsung, HTC, Iphone)?").trim();
if (!pType.equals ("Samsung") && !pType.equals("Iphone")
&& !pType.equals ("HTC")){
JOptionPane.showMessageDialog (null, "Error - Phone Type must be Samsung, HTC, Iphone", "ERROR", JOptionPane.ERROR_MESSAGE);
}
}
while (!pType.equals ("Samsung") && !pType.equals("Iphone")
&& !pType.equals ("HTC"));
String model =null;
model = JOptionPane.showInputDialog ("What is the model of this " +iCode+ "?").trim().toLowerCase();
String os = null;
do{
os = JOptionPane.showInputDialog ("What is the OS of this model in "+iCode+"?").trim();
if (!os.equals ("Android") && !os.equals("IOS")
&& !os.equals ("Windows")){
JOptionPane.showMessageDialog (null, "Error - Phone Type must be Android, IOS, Windows", "Error", JOptionPane.ERROR_MESSAGE);
}
}
while (!os.equals ("Android") && !os.equals("IOS")
&& !os.equals ("Windows"));
Phone hp = new Phone (iCode, categories , (int)quantity, (double)price, pType, model, os, pId);
return hp;
}
public String extractItemCode (String sn){
int index = sn.indexOf(' ');
String itemsCode;
if (index !=-1){
itemsCode = sn.substring(0,index).trim();
}
else{
itemsCode = sn;
}
return itemsCode;
}
}
GeneralDBAccess
package thirdTier;
import java.sql。*;
import java.util.ArrayList; //对象的ArrayList
导入例外。*;
import secondTier。*;
公共类GeneralDBAccess {
private static Item aItem;
private static String url;
private static Connection aConnection;
private static Statement aStatement;
// Implement the three static methods ************
// initialise & terminate - called from PersonWorker
// getAll - called from DataStorage
public static void initialize() throws ClassNotFoundException, SQLException{
// The Data Source Name (DSN) is "persons.accdb"
url = "jdbc:odbc:MS Access Database;DBQ=.\\stocks.accdb";
// load the jdbc - odbc bridge driver for Windows
Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");
// create connection instance
aConnection = DriverManager.getConnection ("jdbc:ucanaccess://stocks.accdb");
// create statement object instance for this connection
aStatement = aConnection.createStatement();
}
public static void terminate() throws SQLException{
//close db connection
aStatement.close();
aConnection.close();
}
public static ArrayList <Item> getAll() throws SQLException{
ArrayList <Item> items = new ArrayList<Item>();
String sqlQuery = "SELECT PhoneID, ItemCode, Categories, Quantity, Price, PhoneType, PhoneModel, OperatingSystem " +
"FROM PhoneTable";
ResultSet rs = aStatement.executeQuery(sqlQuery);
boolean moreData = rs.next();
while (moreData){
String phID = rs.getString(1);
String itCode = rs.getString(2);
String category = rs.getString(3);
int quantity = Integer.parseInt (rs.getString(4));
double price = Double.parseDouble (rs.getString(5));
String phoneType = rs.getString(6);
String phoneModel = rs.getString(7);
String operatingSystem = rs.getString(8);
aItem = new Phone (itCode, category , quantity, price, phoneType, phoneModel, operatingSystem, phID);
items.add (aItem);
moreData = rs.next();
}
sqlQuery = "SELECT SimcardID, ItemCode, Categories, Quantity, Price, SimBrand, ExpiryDate, SimNumber " +
"FROM SimcardTable";
rs = aStatement.executeQuery(sqlQuery);
moreData = rs.next();
while (moreData) {
String siID = rs.getString(1);
String itCode = rs.getString(2);
String category = rs.getString(3);
int quantity = Integer.parseInt (rs.getString(4));
double price = Double.parseDouble (rs.getString(5));
String scBrand = rs.getString(6);
String scExpirydate = rs.getString(7);
int scNumber = Integer.parseInt (rs.getString(8));
aItem = new SimCard (itCode, category , quantity, price, scBrand, scExpirydate, scNumber, siID);
items.add(aItem);
moreData = rs.next();
}
rs.close();
return items;
}
// Implement the four instance methods *************
// addNew, delete, update - called from each specific PD class
// find - used locally by addNew(), delete(), and update().
private Item find (String objectType, String key) throws NotFoundException, SQLException{
aItem = null;
if (objectType.equalsIgnoreCase("Phone")){
String sqlQuery = "SELECT PhoneID, ItemCode, Categories, Quantity, Price, PhoneType, PhoneModel, OperatingSystem " +
"FROM PhoneTable WHERE PhoneID = '"+ key +"'";
ResultSet rs = aStatement.executeQuery (sqlQuery);
boolean gotIt = rs.next();
if (gotIt) {
String phID = rs.getString(1);
String itCode = rs.getString(2);
String category = rs.getString(3);
int quantity = Integer.parseInt (rs.getString(4));
double price = Double.parseDouble (rs.getString(5));
String phoneType = rs.getString(6);
String phoneModel = rs.getString(7);
String operatingSystem = rs.getString(8);
aItem = new Phone (itCode, category , quantity, price, phoneType, phoneModel, operatingSystem, phID);
rs.close();
}else{
rs.close();
throw (new NotFoundException("not found"));
}
}else if (objectType.equalsIgnoreCase("SimCard")){
String sqlQuery1 = "SELECT SimcardID, ItemCode, Categories, Quantity, Price, SimBrand, ExpiryDate, SimNumber " +
"FROM SimcardTable WHERE SimcardID = '" + key + "'";
ResultSet rs = aStatement.executeQuery(sqlQuery1);
boolean gotIt = rs.next();
if (gotIt){
String siID = rs.getString(1);
String itCode = rs.getString(2);
String category = rs.getString(3);
int quantity = Integer.parseInt (rs.getString(4));
double price = Double.parseDouble (rs.getString(5));
String scBrand = rs.getString(6);
String scExpirydate = rs.getString(7);
int scNumber = Integer.parseInt (rs.getString(8));
aItem = new SimCard (itCode, category , quantity, price, scBrand, scExpirydate, scNumber, siID);
rs.close();
}else {
rs.close();
throw (new NotFoundException("not found"));
}
}
return aItem;
} // end
public void addNew (Item aItem) throws DuplicateException, SQLException {
if (aItem instanceof Phone){
Phone anPhone = (Phone) aItem;
String itCode = anPhone.getItemCode();
String category = anPhone.getCategories();
String quantity = Integer.toString (anPhone.getQuantity());
String price = Double.toString (anPhone.getPrice());
String phoneType = anPhone.getPhoneType();
String phoneModel = anPhone.getModel();
String operatingSystem = anPhone.getOperatingSystem();
String phoneID = anPhone.getPhoneId();
String sqlInsert = "INSERT INTO PhoneTable (PhoneID, ItemCode, Categories, Quantity, Price, PhoneType, PhoneModel, OperatingSystem)" +
" VALUES ('" + phoneID + "', '" + itCode + "', '" + category + "', '" + quantity + "', '" + price + "', '" + phoneType + "', '" + phoneModel + "', '" + operatingSystem + "')";
try{
find ("Phone", phoneID);
throw (new DuplicateException ("Phone Already Exists in Database"));
}
catch (NotFoundException e){
aStatement.executeUpdate(sqlInsert);
}
}else if (aItem instanceof SimCard){
SimCard anSimCard = (SimCard) aItem;
String itCode = anSimCard.getItemCode();
String category = anSimCard.getCategories();
String quantity = Integer.toString (anSimCard.getQuantity());
String price = Double.toString (anSimCard.getPrice());
String scBrand = anSimCard.getBrand();
String scExpirydate = anSimCard.getExpiryDate();
String scNumber = Integer.toString (anSimCard.getNumber());
String simcardID = anSimCard.getSimcardId();
String sqlInsert = "INSERT INTO SimcardTable (SimcardID, ItemCode, Categories , Quantity, Price, SimBrand, ExpiryDate, SimNumber)" +
" VALUES ('" + simcardID + "', '" + itCode + "', '" + category + "', '" + quantity + "', '" + price + "', '" + scBrand + "', '" + scExpirydate + "', '" + scNumber + "')";
try{
find ("SimCard", simcardID);
throw (new DuplicateException ("SimCard Already Exists in Database"));
}
catch (NotFoundException e){
aStatement.executeUpdate(sqlInsert);
}
}
}
public void delete (Item aItem) throws NotFoundException, SQLException {
if (aItem instanceof Phone){
Phone anPhone = (Phone) aItem;
String phoneID = anPhone.getPhoneId();
String sqlDelete = "DELETE FROM PhoneTable "
+"WHERE Phone ID = '" + phoneID + "'";
find ("Phone", phoneID);
aStatement.executeUpdate(sqlDelete);
}else if (aItem instanceof SimCard){
SimCard anSimCard = (SimCard) aItem;
String simcardID = anSimCard.getSimcardId();
String sqlDelete = "DELETE FROM SimcardTable "
+ "WHERE SimCard ID = '" + simcardID + "'";
find ("SimCard", simcardID);
aStatement.executeUpdate(sqlDelete);
}
}
public void update (Item aItem) throws NotFoundException, SQLException {
if (aItem instanceof Phone) {
Phone anPhone = (Phone) aItem;
String itCode = anPhone.getItemCode();
String category = anPhone.getCategories();
String quantity = Integer.toString (anPhone.getQuantity());
String price = Double.toString (anPhone.getPrice());
String phoneType = anPhone.getPhoneType();
String phoneModel = anPhone.getModel();
String operatingSystem = anPhone.getOperatingSystem();
String phoneID = anPhone.getPhoneId();
String sqlUpdate = "UPDATE PhoneTable SET ItemCode = '"+ itCode +"', "+
"Categories = '"+category+"', "+
" Quantity = '"+ quantity + "', " +
" Price = '" + price +"', "+
" PhoneType = '" + phoneType +"', "+
" PhoneModel = '" + phoneModel +"', "+
" OperatingSystem = '" + operatingSystem +"', "+
" WHERE PhoneID = '" + phoneID + "'";
find ("Phone", phoneID);
aStatement.executeUpdate(sqlUpdate);
}else if (aItem instanceof SimCard){
SimCard anSimCard = (SimCard) aItem;
String itCode = anSimCard.getItemCode();
String category = anSimCard.getCategories();
String quantity = Integer.toString (anSimCard.getQuantity());
String price = Double.toString (anSimCard.getPrice());
String scBrand = anSimCard.getBrand();
String scExpirydate = anSimCard.getExpiryDate();
String scNumber = Integer.toString (anSimCard.getNumber());
String simcardID = anSimCard.getSimcardId();
String sqlUpdate = "UPDATE SimcardTable SET ItemCode = '"+ itCode +"', "+
"Categories = '"+category+"', "+
" Quantity = '"+ quantity + "', " +
" Price = '" + price +"', "+
" SimBrand = '" + scBrand +"', "+
" SimExpiryDate = '" + scExpirydate +"', "+
" SimNumber = '" + scNumber +"', "+
" WHERE SimcardID = '" + simcardID + "'";
find ("SimCard", simcardID);
aStatement.executeUpdate(sqlUpdate);
}
}
}
数据存储
package secondTier;
import java.sql。; import java.util。;
导入例外。*;
import thirdTier。*;
公共类DataStorage {
ArrayListdStore;
public DataStorage(){
dStore = new ArrayList<Item>();
}
public void getAll() throws SQLException {
dStore.addAll(GeneralDBAccess.getAll());
}
public void add (Item i) throws SQLException, DuplicateException{
int index = find (i);
if (index < 0){
GeneralDBAccess gdba = new GeneralDBAccess();
gdba.addNew(i);
dStore.add(i);
}else {
throw new DuplicateException();
}
}
public Item update (Item i) throws NotFoundException {
int index = find (i);
if (index < 0) {
throw new NotFoundException ();
} else {
i = dStore.get (index);
}
return i;
}
public void updateConfirmed (int index) throws NotFoundException, SQLException {
GeneralDBAccess gdba = new GeneralDBAccess();
gdba.update (dStore.get (index)); // update Device from the database ...
}
public Item delete (Item i) throws NotFoundException {
int index = find (i);
if (index < 0){
throw new NotFoundException ();
}else {
i = dStore.get(index);
}
return i;
}
public void deleteConfirmed (int index) throws NotFoundException, SQLException{
GeneralDBAccess gdba = new GeneralDBAccess();
gdba.delete (dStore.get(index));
dStore.remove(index);
}
public int find (Item i){
int index = -1;
index = Collections.binarySearch(dStore, i);
return index;
}
public void sort(){
Collections.sort (dStore);
}
public int size(){
return dStore.size();
}
public Item get (int index){
return dStore.get(index);
}
}
不确定无法找到手机数据或查询错误？ 请帮助。
答案 0 :(得分：2)
这很可能是罪魁祸首：
String sqlDelete = "DELETE FROM PhoneTable "
+"WHERE Phone ID = '" + phoneID + "'";
您应该使用WHERE [Phone ID] =，WHERE PhoneID =或WHERE Phone_ID =，具体取决于[PhoneTable]表格中列的实际名称。
（您还应该使用PreparedStatement和参数化查询而不是动态SQL。）