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即時通過Android的記事本教程做指導，試圖做一個應用。我可以在表上插入新元素而沒有問題，但是如果我想更新其中一個元素的字段，則會提示錯誤。我重溫了很多次的教程，但我無法找到解決方案。關於類似於記事本教程的應用上的Android SQL問題：CursorIndexOutOfBoundsException：請求索引0，大小爲0
謝謝！
這裏是（插入，刪除和更新）
package citic.android.remoteir;
進口android.app.ListActivity菜單; import android.content.Intent; import android.database.Cursor; import android.os.Bundle; import android.view.ContextMenu; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ContextMenu.ContextMenuInfo; import android.widget.SimpleCursorAdapter; import android.widget.AdapterView.AdapterContextMenuInfo;
public class ServerCp extends ListActivity{
private RemoteIrDbAdapter mDbHelper;
private static final int ACTIVITY_CREATE=0;
private static final int ACTIVITY_EDIT=1;
private static final int INSERT_ID = Menu.FIRST;
private static final int EDIT_ID = Menu.FIRST + 1;
private static final int DELETE_ID = Menu.FIRST + 2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.contentlist);
mDbHelper = new RemoteIrDbAdapter(this);
mDbHelper.open();
fillDataServer();
registerForContextMenu(getListView());
}
private void fillDataServer() {
Cursor c = mDbHelper.fetchAllQueryDataAutoCompleteServerName();
startManagingCursor(c);
String[] from;
from = new String[] { RemoteIrDbAdapter.KEY_NAMESERVER};
int[] to = new int[] { R.id.row1 };
SimpleCursorAdapter data =
new SimpleCursorAdapter(this, R.layout.listrow, c, from, to);
setListAdapter(data);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
menu.add(0, INSERT_ID, 0, R.string.menu_insert_server);
return true;
}
@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
switch(item.getItemId()) {
case INSERT_ID:
createServer();
return true;
}
return super.onMenuItemSelected(featureId, item);
}
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
menu.add(0, EDIT_ID, 0, R.string.menu_edit_server);
menu.add(0, DELETE_ID, 0, R.string.menu_delete_server);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
switch(item.getItemId()) {
case EDIT_ID:
AdapterContextMenuInfo infoEdit = (AdapterContextMenuInfo) item.getMenuInfo();
Intent i = new Intent(this, ServerEdit.class);
i.putExtra(RemoteIrDbAdapter.KEY_ROWIDSERVER, infoEdit.id);
startActivityForResult(i, ACTIVITY_EDIT);
case DELETE_ID:
AdapterContextMenuInfo infoDelete = (AdapterContextMenuInfo) item.getMenuInfo();
mDbHelper.deleteQueryDataServer(infoDelete.id);
fillDataServer();
return true;
}
return super.onContextItemSelected(item);
}
private void createServer() {
Intent i = new Intent(this, ServerEdit.class);
startActivityForResult(i, ACTIVITY_CREATE);
}
/*@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
Intent i = new Intent(this, ProfileEdit.class);
i.putExtra(RemoteIrDbAdapter.KEY_ROWID, id);
startActivityForResult(i, ACTIVITY_EDIT);
}
*/
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
fillDataServer();
}
}
下面是編輯和創建類：
package citic.android.remoteir;
進口android.app.Activity; import android.database.Cursor; import android.os.Bundle; import android.view.View; 進口android.widget.Button; import android.widget.EditText;
public class ServerEdit extends Activity{
private EditText mNameText;
private EditText mIpText;
private EditText mPortText;
private Long mRowId;
private RemoteIrDbAdapter mDbHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDbHelper = new RemoteIrDbAdapter(this);
mDbHelper.open();
setContentView(R.layout.editserver);
mNameText = (EditText) findViewById(R.id.name);
mIpText = (EditText) findViewById(R.id.ip);
mPortText = (EditText) findViewById(R.id.port);
Button confirmButton = (Button) findViewById(R.id.confirm);
mRowId = savedInstanceState != null ? savedInstanceState.getLong(RemoteIrDbAdapter.KEY_ROWIDSERVER)
: null;
if (mRowId == null) {
Bundle extras = getIntent().getExtras();
mRowId = extras != null ? extras.getLong(RemoteIrDbAdapter.KEY_ROWIDSERVER)
: null;
}
System.out.println("el rowid es" + mRowId);
populateFields();
confirmButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
setResult(RESULT_OK);
finish();
}
});
}
private void populateFields() { // <- This is where the error refers
if (mRowId != null) {
Cursor server = mDbHelper.fetchServer(mRowId);
startManagingCursor(server);
mIpText.setText(server.getString(
server.getColumnIndexOrThrow(RemoteIrDbAdapter.KEY_IP)));
mPortText.setText(server.getString(
server.getColumnIndexOrThrow(RemoteIrDbAdapter.KEY_PORT)));
mNameText.setText(server.getString(
server.getColumnIndexOrThrow(RemoteIrDbAdapter.KEY_NAMESERVER)));
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putLong(RemoteIrDbAdapter.KEY_ROWIDSERVER, mRowId);
}
@Override
protected void onPause() {
super.onPause();
saveState();
}
@Override
protected void onResume() {
super.onResume();
populateFields();
}
private void saveState() {
String name = mNameText.getText().toString();
String ip = mIpText.getText().toString();
String port = mPortText.getText().toString();
if (mRowId == null) {
long id = mDbHelper.createQueryDataServer(ip, port, name);
if (id > 0) {
mRowId = id;
}
} else {
mDbHelper.updateServerData(mRowId, ip, port, name);
}
}
}
在這裏，數據庫管理：
package citic.android.remoteir;
進口android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.util.Log;
public class RemoteIrDbAdapter{
public static final boolean DISTINCT = true;
public static final String KEY_ROWIDSERVER= "_id"; //ANTES _IDS
public static final String KEY_PORT = "port";
public static final String KEY_IP = "ip";
public static final String KEY_NAMESERVER = "server";
public static final String KEY_ROWIDPROFILE= "_id"; //ANTES _id
public static final String KEY_NAMEPROFILE= "profile";
//public static final String KEY_ROWID = "_id";
private static final String TAG = "RemoteIrDbAdapterBak";
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
private static final String DATABASE_CREATE_SERVER = "create table server (_id integer primary key autoincrement,ip string not null, port string not null, server string not null);";
/*"create table server (_id integer primary key autoincrement, "
+ "ip string not null, port string not null, server string not null);";*/
private static final String DATABASE_CREATE_PROFILE = "create table profile (_id integer primary key autoincrement, profile string not null);";
/*"create table profile (_id integer primary key autoincrement, "
+ "profile string not null);";*/
private static final String DATABASE_CREATE_SERPRO = "create table serpro (_ids integer not null, _idp integer not null, PRIMARY KEY (_ids, _idp), CONSTRAINT fk_idsps FOREIGN KEY (_ids) REFERENCES server(_id) ON DELETE CASCADE, CONSTRAINT fk_idspp FOREIGN KEY (_ids) REFERENCES server(_id) ON DELETE CASCADE);";
/*"create table serpro (_ids integer not null, _idp integer not null, PRIMARY KEY (_ids, _idp), "
+ " CONSTRAINT fk_idsps REFERENCES server(_id) ON DELETE CASCADE "
+ " CONSTRAINT fk_idspp REFERENCES profile(_id) ON DELETE CASCADE);";*/
private static final String DATABASE_TABLE_SERVER = "server";
private static final String DATABASE_TABLE_PROFILE = "profile";
private static final String DATABASE_TABLE_SERPRO = "serpro";
private static final String TRIGGER_SERPRO_IP = "create trigger serpro_pi before insert on serpro for each row when ((select _id from profile where _id = new._id) is null) begin select raise(abort, 'insert on table \"serpro\" violates foreign key constraint \"fk_idspp\"'); end;";
/*"CREATE TRIGGER SERPRO_PI BEFORE INSERT ON serpro FOR EACH ROW BEGIN SELECT CASE WHEN ((SELECT _id FROM profile WHERE _id = NEW._id) IS NULL) THEN RAISE (ABORT, ‘insert on table serpro violates foreign key constraint fk_idspp’) END; END;";*/
private static final String TRIGGER_SERPRO_UP = "create trigger serpro_up before update on serpro for each row when ((select _id from profile where _id = new._id) is null) begin select raise(abort, 'update on table \"serpro\" violates foreign key constraint \"fk_idspp\"'); end;";
/*"CREATE TRIGGER SERPRO_UP BEFORE UPDATE ON serpro FOR EACH ROW BEGIN SELECT CASE WHEN ((SELECT _id FROM profile WHERE _id = NEW._id) IS NULL) THEN RAISE (ABORT, ‘update on table serpro violates foreign key constraint fk_idspp’) END; END;";*/
private static final String TRIGGER_SERPRO_DP = "create trigger serpro_dp before delete on profile for each row begin select raise(abort, 'delete on table \"profile\" violates foreign key constraint \"fk_idspp\" on \"serpro\"') where (select _idp from serpro where _idp = old._id) is not null; end;";
/*"CREATE TRIGGER SERPRO_DP BEFORE DELETE ON profile FOR EACH ROW BEGIN SELECT CASE WHEN ((SELECT _id FROM serpro WHERE _id = OLD._id) IS NULL) THEN RAISE (ABORT, ‘delete on table profile violates foreign key constraint fk_idspp’) END; END;";*/
private static final String TRIGGER_SERPRO_IS = "create trigger serpro_is before insert on serpro for each row when ((select _id from server where _id = new._id) is null) begin select raise(abort, 'insert on table \"serpro\" violates foreign key constraint \"fk_idsps\"'); end;";
/*"CREATE TRIGGER SERPRO_IS BEFORE INSERT ON serpro FOR EACH ROW BEGIN SELECT CASE WHEN ((SELECT _id FROM server WHERE _id = NEW._id) IS NULL) THEN RAISE (ABORT, ‘insert on table serpro violates foreign key constraint fk_idsps’) END; END;";*/
private static final String TRIGGER_SERPRO_US = "create trigger serpro_us before update on serpro for each row when ((select _id from server where _id = new._id) is null) begin select raise(abort, 'update on table \"serpro\" violates foreign key constraint \"fk_idsps\"'); end;";
/*"CREATE TRIGGER SERPRO_US BEFORE UPDATE ON serpro FOR EACH ROW BEGIN SELECT CASE WHEN ((SELECT _id FROM server WHERE _id = NEW._id) IS NULL) THEN RAISE (ABORT, ‘update on table serpro violates foreign key constraint fk_idsps’) END; END;";*/
private static final String TRIGGER_SERPRO_DS = "create trigger serpro_ds before delete on server for each row when ((select _ids from serpro where _ids = old._id) is not null) begin select raise(abort, 'delete on table \"server\" violates foreign key constraint \"fk_idsps\" on \"server\"'); end;";
/*"CREATE TRIGGER PROFILE_DS BEFORE DELETE ON server FOR EACH ROW BEGIN SELECT CASE WHEN ((SELECT _id FROM serpro WHERE _id = OLD._id) IS NULL) THEN RAISE (ABORT, ‘delete on table server violates foreign key constraint fk_idsps’) END; END;";*/
/*private static final String DATABASE_CREATE =
"create table userdata (_id integer primary key autoincrement, "
+ "ip string not null, port string not null, query string not null, calendar string not null);";*/
private static final String DATABASE_NAME = "data";
//private static final String DATABASE_TABLE = "remoteirdata";
private static final int DATABASE_VERSION = 2;
private final Context mCtx;
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(DATABASE_CREATE_SERVER);
db.execSQL(DATABASE_CREATE_PROFILE);
db.execSQL(DATABASE_CREATE_SERPRO);
db.execSQL(TRIGGER_SERPRO_IP);
db.execSQL(TRIGGER_SERPRO_UP);
db.execSQL(TRIGGER_SERPRO_DP);
db.execSQL(TRIGGER_SERPRO_IS);
db.execSQL(TRIGGER_SERPRO_US);
db.execSQL(TRIGGER_SERPRO_DS);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS server");
db.execSQL("DROP TABLE IF EXISTS profile");
db.execSQL("DROP TABLE IF EXISTS serpro");
onCreate(db);
}
}
public RemoteIrDbAdapter(Context ctx) {
this.mCtx = ctx;
}
public RemoteIrDbAdapter open() throws SQLException {
mDbHelper = new DatabaseHelper(mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close() {
mDbHelper.close();
}
public long createQueryDataServer(String ip, String port, String server) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_IP, ip);
initialValues.put(KEY_PORT, port);
initialValues.put(KEY_NAMESERVER, server);
return mDb.insert(DATABASE_TABLE_SERVER, null, initialValues);
}
public long createQueryDataProfile(String profile) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_NAMEPROFILE, profile);
return mDb.insert(DATABASE_TABLE_PROFILE, null, initialValues);
}
public long createQueryDataSerpro(Integer _id, Integer _idp) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_ROWIDSERVER, _id);
initialValues.put(KEY_ROWIDPROFILE, _idp);
return mDb.insert(DATABASE_TABLE_SERPRO, null, initialValues);
}
public boolean deleteQueryDataServer(long rowId) {
return mDb.delete(DATABASE_TABLE_SERVER, KEY_ROWIDSERVER + "=" + rowId, null) > 0;
}
public boolean deleteQueryDataProfile(long rowId) {
return mDb.delete(DATABASE_TABLE_PROFILE, KEY_ROWIDPROFILE + "=" + rowId, null) > 0;
}
public Cursor fetchServer(long rowId) throws SQLException {
Cursor mCursor =
mDb.query(true, DATABASE_TABLE_SERVER, new String[] {KEY_ROWIDSERVER,
KEY_IP, KEY_PORT, KEY_NAMESERVER}, KEY_ROWIDSERVER + "=" + rowId, null,
null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
public Cursor fetchAllQueryDataServer() {
return mDb.query(DISTINCT, DATABASE_TABLE_SERVER, new String[] {KEY_ROWIDSERVER,KEY_IP, KEY_PORT, KEY_NAMESERVER}, null, null, null, null, null, null);
}
public Cursor fetchAllQueryDataProfile() {
return mDb.query(DISTINCT, DATABASE_TABLE_PROFILE, new String[] {KEY_ROWIDPROFILE,KEY_NAMEPROFILE}, null, null, null, null, null, null);
}
public Cursor fetchAllQueryDataAutoCompleteIp(){
return mDb.query(DISTINCT, DATABASE_TABLE_SERVER, new String[] {KEY_ROWIDSERVER, KEY_IP}, null, null, KEY_IP, null, null, null);
}
public Cursor fetchAllQueryDataAutoCompletePort(){
return mDb.query(DISTINCT, DATABASE_TABLE_SERVER, new String[] {KEY_ROWIDSERVER, KEY_PORT}, null, null, KEY_PORT, null, null, null);
}
public Cursor fetchAllQueryDataAutoCompleteServerName(){
//return mDb.query(DISTINCT, DATABASE_TABLE_SERVER, new String[] {KEY_ROWIDSERVER, KEY_NAMESERVER}, null, null, KEY_NAMESERVER, null, null, null);
return mDb.rawQuery("SELECT DISTINCT server, _id as _id from server order by _id", null);
}
public Cursor fetchAllQueryDataAutoCompleteProfileName(){
// return mDb.query(DISTINCT, DATABASE_TABLE_PROFILE, new String[] {KEY_ROWIDPROFILE, KEY_NAMEPROFILE}, null, null, KEY_NAMEPROFILE, null, null, null);
//"SELECT DISTINCT (ip, _id) FROM userdata ORDER BY ip";
return mDb.rawQuery("SELECT DISTINCT profile, _id from profile order by _id", null);
//return mDb.rawQuery("SELECT DISTINCT profile, _id as _id from profile order by _id", null);
}
public Cursor fetchAllQueryData() {
return mDb.query(DISTINCT, DATABASE_TABLE_SERVER, new String[] {KEY_ROWIDSERVER,KEY_IP, KEY_PORT, KEY_NAMESERVER}, null, null, null, null, null, null);
}
public Cursor fetchAllServersNotOnProfileData(long idProfile){
String sqlstart = "SELECT server.server FROM server INNER JOIN (serpro INNER JOIN profile ON serpro._id = profile._id WHERE profile._id NOT LIKE '";
String sqlend = "')ON server._id = serpro._id;";
String sql = sqlstart + idProfile + sqlend;
return mDb.rawQuery(sql, null);
}
public Cursor fetchAllServersOnProfileData(long idProfile){
String sqlstart = "SELECT server.server FROM server INNER JOIN (serpro INNER JOIN profile ON serpro._id = profile._id WHERE profile._id LIKE '";
String sqlend = "')ON server._id = serpro._id;";
String sql = sqlstart + idProfile + sqlend;
return mDb.rawQuery(sql, null);
}
public boolean updateServerData(long rowId, String ip, String port, String server) {
ContentValues args = new ContentValues();
args.put(KEY_IP, ip);
args.put(KEY_PORT, port);
args.put(KEY_NAMESERVER, server);
return mDb.update(DATABASE_TABLE_SERVER, args, KEY_ROWIDSERVER + "=" + rowId, null) > 0;
}
public boolean updateProfileData(long rowId, String profile) {
ContentValues args = new ContentValues();
args.put(KEY_NAMEPROFILE, profile);
return mDb.update(DATABASE_TABLE_PROFILE, args, KEY_ROWIDPROFILE + "=" + rowId, null) > 0;
}
}
和錯誤是這樣的：
05-14 10:07:46.766: ERROR/AndroidRuntime(324): Uncaught handler: thread main exiting due to uncaught exception
05-14 10:07:46.776: ERROR/AndroidRuntime(324): java.lang.RuntimeException: Unable to start activity ComponentInfo{citic.android.remoteir/citic.android.remoteir.ServerEdit}: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at android.app.ActivityThread.access$2100(ActivityThread.java:116)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at android.os.Handler.dispatchMessage(Handler.java:99)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at android.os.Looper.loop(Looper.java:123)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at android.app.ActivityThread.main(ActivityThread.java:4203)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at java.lang.reflect.Method.invokeNative(Native Method)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at java.lang.reflect.Method.invoke(Method.java:521)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at dalvik.system.NativeStart.main(Native Method)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): Caused by: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at android.database.AbstractCursor.checkPosition(AbstractCursor.java:580)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:172)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:41)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at citic.android.remoteir.ServerEdit.populateFields(ServerEdit.java:57)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at citic.android.remoteir.ServerEdit.onCreate(ServerEdit.java:41)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
05-14 10:07:46.776: ERROR/AndroidRuntime(324): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
謝謝大家，即時通訊與此相當的絕望：■
我有一個完全相似的問題，所以現在我正在使用try/catch圍繞get id語句。什麼是正確的方式來處理返回0行的遊標？ – 2011-01-22 11:50:16