下面的代码来自UserLoggedInPage.java ...这里当按下存款按钮时，它应该将交易插入到交易表中..
public void onClick(View arg0) {
// TODO Auto-generated method stub
convertEditTextVarsIntoStrings();
boolean depo;
switch (arg0.getId()) {
case R.id.bBalance:
Log.d(TAG, "Pressed Show Balance");
try {
showBalance(Userbalance);
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
break;
case R.id.bDeposit:
Log.d(TAG, "Pressed Deposit");
depo = true;
try {
UA.deposit(DepositAmt);
Userbalance = String.valueOf(UA.setBalance());
updateBalanceDatabase(id, Userbalance, UserLoggedInPage.this);
updateTransactionDatabase(id, DepositAmt, depo,
UserLoggedInPage.this);
} catch (RemoteException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
break;
case R.id.bWithdraw:
Log.d(TAG, "Pressed Withdraw");
depo = false;
try {
UA.withdraw(WithdrawAmt);
Userbalance = String.valueOf(UA.setBalance());
updateBalanceDatabase(id, Userbalance, UserLoggedInPage.this);
updateTransactionDatabase(id, WithdrawAmt, depo,
UserLoggedInPage.this);
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
}
public void updateTransactionDatabase(String id2, String Amt,
boolean depo, Context context) throws SQLException{
String add;
int iddd = Integer.parseInt(id2);
// TODO Auto-generated method stub
if (depo == true) {
add = "Deposit :";
} else {
add = "Withdraw :";
}
myDb = new DbHelper(context);
SQLiteDatabase db = myDb.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("user_id", iddd);
values.put("trans", add + Amt);
try {
db.insert(DbHelper.SUBH_TABLE_DATA, null, values);
Toast.makeText(getApplicationContext(), "Transaction Sucessful!!",
Toast.LENGTH_SHORT).show();
System.out.println("Inside Transaction");
} catch (Exception e) {
e.printStackTrace();
}
}
以下代码来自AdminPage.java
public void onClick(View v) {
switch (v.getId()) {
case R.id.buttonLogin:
mPassword = (EditText) findViewById(R.id.editPassword);
String pass = mPassword.getText().toString();
if (pass.equals("") || pass == null) {
Toast.makeText(getApplicationContext(), "Password Missing",
Toast.LENGTH_SHORT).show();
} else {
if (pass.equals("admin")) {
Toast.makeText(getApplicationContext(), "Retrieving Data",
Toast.LENGTH_SHORT).show();
// retrieveEntries();
retrieveLastTransaction();
} else {
Toast.makeText(getApplicationContext(),
"Admin Login Failed", Toast.LENGTH_SHORT).show();
}
}
break;
case R.id.buttonCancel:
Intent i = new Intent(AdminPage.this, DatabaseActivity.class);
startActivity(i);
finish();
break;
}
}
public void retrieveLastTransaction() throws SQLException {
// TODO Auto-generated method stub
try {
SQLiteDatabase db = myDb.getReadableDatabase();
String[] columns = { "user_id", "trans" };
Cursor cursor = db.query(DbHelper.SUBH_TABLE_DATA, columns, null,
null, null, null, null);
if (cursor != null) {
System.out.println("Transaction showing");
startManagingCursor(cursor);
showTransactionDatabase(cursor);
}
System.out.println("Cursor NuLL");
} catch (Exception e) {
e.printStackTrace();
}
}
private void showTransactionDatabase(Cursor cursor) throws SQLException {
// TODO Auto-generated method stub
StringBuilder ret = new StringBuilder("\tDatabase Values\n\n");
ret.append("\nID\t\t\t Transaction\t\n");
while (cursor.moveToNext()) {
String idddd = cursor.getString(0);
String transac = cursor.getString(1);
ret.append(idddd + "\t" + transac + "\n");
}
TextView result = new TextView(this);
result.setText(ret);
setContentView(result);
}
以下代码来自DbHelper.java，我创建了两个表'login'和'Transaction'表.... 问题是我无法在Transaction表中插入任何数据
private static final String DATABASE_NAME = "saket.db";
private static final int DATABASE_VERSION = 1;
public static final String SUBH_TABLE_NAME = "login";
public static final String SUBH_TABLE_DATA = "Transaction";
public static final String KEY_ROWID = "_id";
private static final String SUBH_TABLE_CREATE =
"CREATE TABLE " + SUBH_TABLE_NAME + "(" +
"_id INTEGER PRIMARY KEY AUTOINCREMENT,"+
"username TEXT NOT NULL, password TEXT NOT NULL, email TEXT NOT NULL, balance INTEGER);";
private static final String SUBH_TABLE_DATA_CREATE =
"CREATE TABLE " + SUBH_TABLE_DATA + "(" +
"user_id INTEGER, " +
"trans TEXT NOT NULL);";
private static final String SAKET_DB_ADMIN = "INSERT INTO "+SUBH_TABLE_NAME +" values(1, admin, password, admin@gmail.com, balance);";
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
System.out.println("In constructor");
}
/* (non-Javadoc)
* @see android.database.sqlite.SQLiteOpenHelper#onCreate(android.database.sqlite.SQLiteDatabase)
*/
@Override
public void onCreate(SQLiteDatabase db) {
try{
//Create Database
db.execSQL(SUBH_TABLE_CREATE);
//create admin account
db.execSQL(SAKET_DB_ADMIN);
//create transaction account
db.execSQL(SUBH_TABLE_DATA_CREATE);
System.out.println("In onCreate");
}catch(Exception e){
e.printStackTrace();
}
}
这是logcat ..
08-04 23:15:22.582: I/Database(1558): sqlite returned: error code = 1, msg = near "Transaction": syntax error
08-04 23:15:22.582: W/System.err(1558): android.database.sqlite.SQLiteException: near "Transaction": syntax error: , while compiling: SELECT user_id, trans FROM Transaction
08-04 23:15:22.592: W/System.err(1558): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
08-04 23:15:22.592: W/System.err(1558): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:91)
08-04 23:15:22.602: W/System.err(1558): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64)
08-04 23:15:22.612: W/System.err(1558): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:80)
08-04 23:15:22.612: W/System.err(1558): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:46)
08-04 23:15:22.612: W/System.err(1558): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:42)
08-04 23:15:22.612: W/System.err(1558): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1345)
08-04 23:15:22.622: W/System.err(1558): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1229)
08-04 23:15:22.632: W/System.err(1558): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1184)
08-04 23:15:22.632: W/System.err(1558): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1264)
08-04 23:15:22.643: W/System.err(1558): at home.saket.AdminPage.retrieveLastTransaction(AdminPage.java:93)
08-04 23:15:22.643: W/System.err(1558): at home.saket.AdminPage.onClick(AdminPage.java:68)
08-04 23:15:22.643: W/System.err(1558): at android.view.View.performClick(View.java:2408)
08-04 23:15:22.643: W/System.err(1558): at android.view.View$PerformClick.run(View.java:8816)
08-04 23:15:22.643: W/System.err(1558): at android.os.Handler.handleCallback(Handler.java:587)
08-04 23:15:22.643: W/System.err(1558): at android.os.Handler.dispatchMessage(Handler.java:92)
08-04 23:15:22.643: W/System.err(1558): at android.os.Looper.loop(Looper.java:123)
08-04 23:15:22.652: W/System.err(1558): at android.app.ActivityThread.main(ActivityThread.java:4627)
08-04 23:15:22.652: W/System.err(1558): at java.lang.reflect.Method.invokeNative(Native Method)
08-04 23:15:22.652: W/System.err(1558): at java.lang.reflect.Method.invoke(Method.java:521)
08-04 23:15:22.652: W/System.err(1558): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-04 23:15:22.652: W/System.err(1558): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-04 23:15:22.662: W/System.err(1558): at dalvik.system.NativeStart.main(Native Method)
08-04 23:15:27.502: D/dalvikvm(115): GC_EXPLICIT freed 1043 objects / 58184 bytes in 182ms