下面列出了android.database.sqlite.SQLiteOpenHelper#getReadableDatabase ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
public boolean hasHistoryItems() {
SQLiteOpenHelper helper = new DBHelper(activity);
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COUNT_COLUMN, null, null, null, null, null);
cursor.moveToFirst();
return cursor.getInt(0) > 0;
} finally {
close(cursor, db);
}
}
public List<HistoryItem> buildHistoryItems() {
SQLiteOpenHelper helper = new DBHelper(activity);
List<HistoryItem> items = new ArrayList<>();
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COLUMNS, null, null, null, null, DBHelper.TIMESTAMP_COL + " DESC");
while (cursor.moveToNext()) {
String text = cursor.getString(0);
String display = cursor.getString(1);
String format = cursor.getString(2);
long timestamp = cursor.getLong(3);
String details = cursor.getString(4);
Result result = new Result(text, null, null, BarcodeFormat.valueOf(format), timestamp);
items.add(new HistoryItem(result, display, details));
}
} finally {
close(cursor, db);
}
return items;
}
public HistoryItem buildHistoryItem(int number) {
SQLiteOpenHelper helper = new DBHelper(activity);
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COLUMNS, null, null, null, null, DBHelper.TIMESTAMP_COL + " DESC");
cursor.move(number + 1);
String text = cursor.getString(0);
String display = cursor.getString(1);
String format = cursor.getString(2);
long timestamp = cursor.getLong(3);
String details = cursor.getString(4);
Result result = new Result(text, null, null, BarcodeFormat.valueOf(format), timestamp);
return new HistoryItem(result, display, details);
} finally {
close(cursor, db);
}
}
public List<HistoryItem> buildHistoryItems() {
SQLiteOpenHelper helper = new DBHelper(activity);
List<HistoryItem> items = new ArrayList<>();
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COLUMNS, null, null, null, null, DBHelper.TIMESTAMP_COL + " DESC");
while (cursor.moveToNext()) {
String text = cursor.getString(0);
String display = cursor.getString(1);
String format = cursor.getString(2);
long timestamp = cursor.getLong(3);
String details = cursor.getString(4);
Result result = new Result(text, null, null, BarcodeFormat.valueOf(format), timestamp);
items.add(new HistoryItem(result, display, details));
}
} finally {
close(cursor, db);
}
return items;
}
public HistoryItem buildHistoryItem(int number) {
SQLiteOpenHelper helper = new DBHelper(activity);
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COLUMNS, null, null, null, null, DBHelper.TIMESTAMP_COL + " DESC");
cursor.move(number + 1);
String text = cursor.getString(0);
String display = cursor.getString(1);
String format = cursor.getString(2);
long timestamp = cursor.getLong(3);
String details = cursor.getString(4);
Result result = new Result(text, null, null, BarcodeFormat.valueOf(format), timestamp);
return new HistoryItem(result, display, details);
} finally {
close(cursor, db);
}
}
public List<HistoryItem> buildHistoryItems() {
SQLiteOpenHelper helper = new DBHelper(activity);
List<HistoryItem> items = new ArrayList<>();
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COLUMNS, null, null, null, null, DBHelper.TIMESTAMP_COL + " DESC");
while (cursor.moveToNext()) {
String text = cursor.getString(0);
String display = cursor.getString(1);
String format = cursor.getString(2);
long timestamp = cursor.getLong(3);
String details = cursor.getString(4);
Result result = new Result(text, null, null, BarcodeFormat.valueOf(format), timestamp);
items.add(new HistoryItem(result, display, details));
}
} finally {
close(cursor, db);
}
return items;
}
public List<HistoryItem> buildHistoryItems() {
SQLiteOpenHelper helper = new DBHelper(activity);
List<HistoryItem> items = new ArrayList<>();
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COLUMNS, null, null, null, null, DBHelper.TIMESTAMP_COL + " DESC");
while (cursor.moveToNext()) {
String text = cursor.getString(0);
String display = cursor.getString(1);
String format = cursor.getString(2);
long timestamp = cursor.getLong(3);
String details = cursor.getString(4);
Result result = new Result(text, null, null, BarcodeFormat.valueOf(format), timestamp);
items.add(new HistoryItem(result, display, details));
}
} finally {
close(cursor, db);
}
return items;
}
public HistoryItem buildHistoryItem(int number) {
SQLiteOpenHelper helper = new DBHelper(activity);
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COLUMNS, null, null, null, null, DBHelper.TIMESTAMP_COL + " DESC");
cursor.move(number + 1);
String text = cursor.getString(0);
String display = cursor.getString(1);
String format = cursor.getString(2);
long timestamp = cursor.getLong(3);
String details = cursor.getString(4);
Result result = new Result(text, null, null, BarcodeFormat.valueOf(format), timestamp);
return new HistoryItem(result, display, details);
} finally {
close(cursor, db);
}
}
public HistoryItem buildHistoryItem(int number) {
SQLiteOpenHelper helper = new DBHelper(activity);
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COLUMNS, null, null, null, null, DBHelper.TIMESTAMP_COL + " DESC");
cursor.move(number + 1);
String text = cursor.getString(0);
String display = cursor.getString(1);
String format = cursor.getString(2);
long timestamp = cursor.getLong(3);
String details = cursor.getString(4);
Result result = new Result(text, null, null, BarcodeFormat.valueOf(format), timestamp);
return new HistoryItem(result, display, details);
} finally {
close(cursor, db);
}
}
public List<HistoryItem> buildHistoryItems() {
SQLiteOpenHelper helper = new DBHelper(activity);
List<HistoryItem> items = new ArrayList<>();
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COLUMNS, null, null, null, null, DBHelper.TIMESTAMP_COL + " DESC");
while (cursor.moveToNext()) {
String text = cursor.getString(0);
String display = cursor.getString(1);
String format = cursor.getString(2);
long timestamp = cursor.getLong(3);
String details = cursor.getString(4);
Result result = new Result(text, null, null, BarcodeFormat.valueOf(format), timestamp);
items.add(new HistoryItem(result, display, details));
}
} finally {
close(cursor, db);
}
return items;
}
public boolean hasHistoryItems() {
SQLiteOpenHelper helper = new DBHelper(activity);
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COUNT_COLUMN, null, null, null, null, null);
cursor.moveToFirst();
return cursor.getInt(0) > 0;
} finally {
close(cursor, db);
}
}
private Cursor getDisplayOptionsCursor(SQLiteOpenHelper helper) {
SQLiteDatabase db = helper.getReadableDatabase();
String sql = "select distinct topic._id as _id, topic.title as title from topic, topicvideo, video where video.download_status>? and topicvideo.video_id=video.readable_id and topicvideo.topic_id=topic._id group by title";
String[] selectionArgs = {String.valueOf(Video.DL_STATUS_NOT_STARTED)};
Cursor mainCursor = db.rawQuery(sql, selectionArgs);
sql = "select '-1' as _id, 'All Videos' as title";
Cursor headerCursor = db.rawQuery(sql, null);
MergeCursor cursor = new MergeCursor(new Cursor[] {headerCursor, mainCursor});
return cursor;
}
public boolean hasHistoryItems() {
SQLiteOpenHelper helper = new DBHelper(activity);
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COUNT_COLUMN, null, null, null, null, null);
cursor.moveToFirst();
return cursor.getInt(0) > 0;
} finally {
close(cursor, db);
}
}
public boolean hasHistoryItems() {
SQLiteOpenHelper helper = new DBHelper(activity);
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COUNT_COLUMN, null, null, null, null, null);
cursor.moveToFirst();
return cursor.getInt(0) > 0;
} finally {
close(cursor, db);
}
}
public boolean hasHistoryItems() {
SQLiteOpenHelper helper = new DBHelper(activity);
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COUNT_COLUMN, null, null, null, null, null);
cursor.moveToFirst();
return cursor.getInt(0) > 0;
} finally {
close(cursor, db);
}
}
public boolean hasHistoryItems() {
SQLiteOpenHelper helper = new DBHelper(activity);
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = helper.getReadableDatabase();
cursor = db.query(DBHelper.TABLE_NAME, COUNT_COLUMN, null, null, null, null, null);
cursor.moveToFirst();
return cursor.getInt(0) > 0;
} finally {
close(cursor, db);
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drink);
//Get the drink from the intent
int drinkNo = (Integer)getIntent().getExtras().get(EXTRA_DRINKNO);
//Create a cursor
try {
SQLiteOpenHelper starbuzzDatabaseHelper = new StarbuzzDatabaseHelper(this);
SQLiteDatabase db = starbuzzDatabaseHelper.getReadableDatabase();
Cursor cursor = db.query ("DRINK",
new String[] {"NAME", "DESCRIPTION", "IMAGE_RESOURCE_ID", "FAVORITE"},
"_id = ?",
new String[] {Integer.toString(drinkNo)},
null, null,null);
//Move to the first record in the Cursor
if (cursor.moveToFirst()) {
//Get the drink details from the cursor
String nameText = cursor.getString(0);
String descriptionText = cursor.getString(1);
int photoId = cursor.getInt(2);
boolean isFavorite = (cursor.getInt(3) == 1);
//Populate the drink name
TextView name = (TextView)findViewById(R.id.name);
name.setText(nameText);
//Populate the drink description
TextView description = (TextView)findViewById(R.id.description);
description.setText(descriptionText);
//Populate the drink image
ImageView photo = (ImageView)findViewById(R.id.photo);
photo.setImageResource(photoId);
photo.setContentDescription(nameText);
//Populate the favorite checkbox
CheckBox favorite = (CheckBox)findViewById(R.id.favorite);
favorite.setChecked(isFavorite);
}
cursor.close();
db.close();
} catch(SQLiteException e) {
Toast toast = Toast.makeText(this, "Database unavailable", Toast.LENGTH_SHORT);
toast.show();
}
}
/**
* Tests that onUpgrade works by inserting 2 rows then calling onUpgrade and verifies that the
* database has been successfully dropped and recreated by checking that the database is there
* but empty
* @throws Exception in case the constructor hasn't been implemented yet
*/
@Test
public void upgrade_database_test() throws Exception{
/* Insert 2 rows before we upgrade to check that we dropped the database correctly */
/* Use reflection to try to run the correct constructor whenever implemented */
SQLiteOpenHelper dbHelper =
(SQLiteOpenHelper) mDbHelperClass.getConstructor(Context.class).newInstance(mContext);
/* Use WaitlistDbHelper to get access to a writable database */
SQLiteDatabase database = dbHelper.getWritableDatabase();
ContentValues testValues = new ContentValues();
testValues.put(WaitlistContract.WaitlistEntry.COLUMN_GUEST_NAME, "test name");
testValues.put(WaitlistContract.WaitlistEntry.COLUMN_PARTY_SIZE, 99);
/* Insert ContentValues into database and get first row ID back */
long firstRowId = database.insert(
WaitlistContract.WaitlistEntry.TABLE_NAME,
null,
testValues);
/* Insert ContentValues into database and get another row ID back */
long secondRowId = database.insert(
WaitlistContract.WaitlistEntry.TABLE_NAME,
null,
testValues);
dbHelper.onUpgrade(database, 0, 1);
database = dbHelper.getReadableDatabase();
/* This Cursor will contain the names of each table in our database */
Cursor tableNameCursor = database.rawQuery(
"SELECT name FROM sqlite_master WHERE type='table' AND name='" +
WaitlistContract.WaitlistEntry.TABLE_NAME + "'",
null);
assertTrue(tableNameCursor.getCount() == 1);
/*
* Query the database and receive a Cursor. A Cursor is the primary way to interact with
* a database in Android.
*/
Cursor wCursor = database.query(
/* Name of table on which to perform the query */
WaitlistContract.WaitlistEntry.TABLE_NAME,
/* Columns; leaving this null returns every column in the table */
null,
/* Optional specification for columns in the "where" clause above */
null,
/* Values for "where" clause */
null,
/* Columns to group by */
null,
/* Columns to filter by row groups */
null,
/* Sort order to return in Cursor */
null);
/* Cursor.moveToFirst will return false if there are no records returned from your query */
assertFalse("Database doesn't seem to have been dropped successfully when upgrading",
wCursor.moveToFirst());
tableNameCursor.close();
database.close();
}
/**
* Tests that onUpgrade works by inserting 2 rows then calling onUpgrade and verifies that the
* database has been successfully dropped and recreated by checking that the database is there
* but empty
* @throws Exception in case the constructor hasn't been implemented yet
*/
@Test
public void upgrade_database_test() throws Exception{
/* Insert 2 rows before we upgrade to check that we dropped the database correctly */
/* Use reflection to try to run the correct constructor whenever implemented */
SQLiteOpenHelper dbHelper =
(SQLiteOpenHelper) mDbHelperClass.getConstructor(Context.class).newInstance(mContext);
/* Use WaitlistDbHelper to get access to a writable database */
SQLiteDatabase database = dbHelper.getWritableDatabase();
ContentValues testValues = new ContentValues();
testValues.put(WaitlistContract.WaitlistEntry.COLUMN_GUEST_NAME, "test name");
testValues.put(WaitlistContract.WaitlistEntry.COLUMN_PARTY_SIZE, 99);
/* Insert ContentValues into database and get first row ID back */
long firstRowId = database.insert(
WaitlistContract.WaitlistEntry.TABLE_NAME,
null,
testValues);
/* Insert ContentValues into database and get another row ID back */
long secondRowId = database.insert(
WaitlistContract.WaitlistEntry.TABLE_NAME,
null,
testValues);
dbHelper.onUpgrade(database, 0, 1);
database = dbHelper.getReadableDatabase();
/* This Cursor will contain the names of each table in our database */
Cursor tableNameCursor = database.rawQuery(
"SELECT name FROM sqlite_master WHERE type='table' AND name='" +
WaitlistContract.WaitlistEntry.TABLE_NAME + "'",
null);
assertTrue(tableNameCursor.getCount() == 1);
/*
* Query the database and receive a Cursor. A Cursor is the primary way to interact with
* a database in Android.
*/
Cursor wCursor = database.query(
/* Name of table on which to perform the query */
WaitlistContract.WaitlistEntry.TABLE_NAME,
/* Columns; leaving this null returns every column in the table */
null,
/* Optional specification for columns in the "where" clause above */
null,
/* Values for "where" clause */
null,
/* Columns to group by */
null,
/* Columns to filter by row groups */
null,
/* Sort order to return in Cursor */
null);
/* Cursor.moveToFirst will return false if there are no records returned from your query */
assertFalse("Database doesn't seem to have been dropped successfully when upgrading",
wCursor.moveToFirst());
tableNameCursor.close();
database.close();
}
/**
* Tests that onUpgrade works by inserting 2 rows then calling onUpgrade and verifies that the
* database has been successfully dropped and recreated by checking that the database is there
* but empty
* @throws Exception in case the constructor hasn't been implemented yet
*/
@Test
public void upgrade_database_test() throws Exception{
/* Insert 2 rows before we upgrade to check that we dropped the database correctly */
/* Use reflection to try to run the correct constructor whenever implemented */
SQLiteOpenHelper dbHelper =
(SQLiteOpenHelper) mDbHelperClass.getConstructor(Context.class).newInstance(mContext);
/* Use WaitlistDbHelper to get access to a writable database */
SQLiteDatabase database = dbHelper.getWritableDatabase();
ContentValues testValues = new ContentValues();
testValues.put(WaitlistContract.WaitlistEntry.COLUMN_GUEST_NAME, "test name");
testValues.put(WaitlistContract.WaitlistEntry.COLUMN_PARTY_SIZE, 99);
/* Insert ContentValues into database and get first row ID back */
long firstRowId = database.insert(
WaitlistContract.WaitlistEntry.TABLE_NAME,
null,
testValues);
/* Insert ContentValues into database and get another row ID back */
long secondRowId = database.insert(
WaitlistContract.WaitlistEntry.TABLE_NAME,
null,
testValues);
dbHelper.onUpgrade(database, 0, 1);
database = dbHelper.getReadableDatabase();
/* This Cursor will contain the names of each table in our database */
Cursor tableNameCursor = database.rawQuery(
"SELECT name FROM sqlite_master WHERE type='table' AND name='" +
WaitlistContract.WaitlistEntry.TABLE_NAME + "'",
null);
assertTrue(tableNameCursor.getCount() == 1);
/*
* Query the database and receive a Cursor. A Cursor is the primary way to interact with
* a database in Android.
*/
Cursor wCursor = database.query(
/* Name of table on which to perform the query */
WaitlistContract.WaitlistEntry.TABLE_NAME,
/* Columns; leaving this null returns every column in the table */
null,
/* Optional specification for columns in the "where" clause above */
null,
/* Values for "where" clause */
null,
/* Columns to group by */
null,
/* Columns to filter by row groups */
null,
/* Sort order to return in Cursor */
null);
/* Cursor.moveToFirst will return false if there are no records returned from your query */
assertFalse("Database doesn't seem to have been dropped successfully when upgrading",
wCursor.moveToFirst());
tableNameCursor.close();
database.close();
}