本文整理汇总了Java中com.google.appengine.api.datastore.Query类的典型用法代码示例。如果您正苦于以下问题：Java Query类的具体用法？Java Query怎么用？Java Query使用的例子？那么, 这里精选的类代码示例或许可以为您提供帮助。
Query类属于com.google.appengine.api.datastore包，在下文中一共展示了Query类的15个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: doGet
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
resp.setContentType("text/html");
resp.getWriter().println("<html><body>");
DatastoreService datastore = DatastoreServiceFactory
.getDatastoreService();
Query query = new Query("SharedList");
query.addSort(Entity.KEY_RESERVED_PROPERTY, SortDirection.ASCENDING);
List<Entity> results = datastore.prepare(query).asList(
FetchOptions.Builder.withDefaults());
for (Entity entity : results) {
String email = (String) entity.getProperty("email");
String productID = (String) entity.getKey().getName();
String productName = (String) entity.getProperty("productName");
Date sharedDate = (Date) entity.getProperty("sharedDate");
resp.getWriter().println(
email + " shared <a href=\"http://www.amazon.com/dp/"
+ productID + "\" target=\"_blank\">" + "<b>"
+ productName + "</b></a>!<br>");
}
resp.getWriter().println("</body></html>");
}
示例2: convert
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
private Query.FilterOperator convert(Condition condition) {
OperationKey key = condition.getKey();
switch (key) {
case EQUALS:
return condition.isNegating() ? Query.FilterOperator.NOT_EQUAL : Query.FilterOperator.EQUAL;
case IN:
return Query.FilterOperator.IN;
case GREATER:
return Query.FilterOperator.GREATER_THAN;
case GREATER_EQUAL:
return Query.FilterOperator.GREATER_THAN_OR_EQUAL;
case LESS:
return Query.FilterOperator.LESS_THAN;
case LESS_EQUAL:
return Query.FilterOperator.LESS_THAN_OR_EQUAL;
default:
throw new IllegalArgumentException("Unsupported operator " + condition.getKey());
}
}
示例3: getNationalHighScores
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
/**
* Method to retrieve the national high scores
* @return
*/
public List<Entity> getNationalHighScores(String countryCode){
log.info("Retrieving national high scores");
//create the country code filter
Filter country = new FilterPredicate(Constants.COUNTRY_CODE,FilterOperator.EQUAL,countryCode);
//create the query to read the records sorted by score
Query q = new Query(Constants.RECORD).addSort(Constants.SCORE, SortDirection.DESCENDING);
//set the filter to the query
q.setFilter(country);
PreparedQuery pq = datastore.prepare(q);
//retrieve and return the list of records
return pq.asList(FetchOptions.Builder.withLimit(100));
}
示例4: getMonthlyHighScores
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
/**
* Method to retrieve the monthly high scores
* @return
*/
public List<Entity> getMonthlyHighScores(){
log.info("Retrieving monthly high scores");
//calculate calendar info
Calendar calendar= Calendar.getInstance();
int year=calendar.get(Calendar.YEAR);
int month=calendar.get(Calendar.MONTH);
//create filters
Filter yearFilter = new FilterPredicate(Constants.YEAR,FilterOperator.EQUAL,year);
Filter monthFilter = new FilterPredicate(Constants.MONTH,FilterOperator.EQUAL,month);
//create the query to read the records sorted by score
Query q = new Query(Constants.RECORD).addSort(Constants.SCORE, SortDirection.DESCENDING);
//set filters to the query
q.setFilter(yearFilter);
q.setFilter(monthFilter);
//prepare query
PreparedQuery pq = datastore.prepare(q);
//retrieve and return the list of records
return pq.asList(FetchOptions.Builder.withLimit(100));
}
示例5: getWeeklyHighScores
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
/**
* Method to retrieve the weekly high scores
* @return
*/
public List<Entity> getWeeklyHighScores(){
log.info("Retrieving weekly high scores");
//calculate calendar info
Calendar calendar= Calendar.getInstance();
int year=calendar.get(Calendar.YEAR);
int week=calendar.get(Calendar.WEEK_OF_YEAR);
//create filters
Filter yearFilter = new FilterPredicate(Constants.YEAR,FilterOperator.EQUAL,year);
Filter weekFilter = new FilterPredicate(Constants.WEEK_OF_THE_YEAR,FilterOperator.EQUAL,week);
//create the query to read the records sorted by score
Query q = new Query(Constants.RECORD).addSort(Constants.SCORE, SortDirection.DESCENDING);
//set filters to the query
q.setFilter(yearFilter);
q.setFilter(weekFilter);
//prepare query
PreparedQuery pq = datastore.prepare(q);
//retrieve and return the list of records
return pq.asList(FetchOptions.Builder.withLimit(100));
}
示例6: getDailyHighScores
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
/**
* Method to retrieve the daily high scores
* @return
*/
public List<Entity> getDailyHighScores(){
log.info("Retrieving weekly high scores");
//calculate calendar info
Calendar calendar= Calendar.getInstance();
int year=calendar.get(Calendar.YEAR);
int day=calendar.get(Calendar.DAY_OF_YEAR);
//create filters
Filter yearFilter = new FilterPredicate(Constants.YEAR,FilterOperator.EQUAL,year);
Filter dayFilter = new FilterPredicate(Constants.DAY_OF_THE_YEAR,FilterOperator.EQUAL,day);
//create the query to read the records sorted by score
Query q = new Query(Constants.RECORD).addSort(Constants.SCORE, SortDirection.DESCENDING);
//set filters to the query
q.setFilter(yearFilter);
q.setFilter(dayFilter);
//prepare query
PreparedQuery pq = datastore.prepare(q);
//retrieve and return the list of records
return pq.asList(FetchOptions.Builder.withLimit(100));
}
示例7: getAllUdwIds
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
public List<ConvUdwMapping> getAllUdwIds(SlobId convObjectId)
throws PermanentFailure, RetryableFailure {
Query q = new Query(ENTITY_KIND)
.setFilter(FilterOperator.GREATER_THAN_OR_EQUAL.of(Entity.KEY_RESERVED_PROPERTY,
directory.makeKey(new Key(convObjectId, FIRST))))
.addSort(Entity.KEY_RESERVED_PROPERTY, SortDirection.ASCENDING);
List<ConvUdwMapping> entries = Lists.newArrayList();
CheckedIterator it = datastore.prepareNontransactionalQuery(q)
.asIterator(FetchOptions.Builder.withDefaults());
while (it.hasNext()) {
ConvUdwMapping entry = directory.parse(it.next());
if (!entry.getKey().getConvObjectId().equals(convObjectId)) {
break;
}
entries.add(entry);
}
log.info("Found " + entries.size() + " user data wavelets for " + convObjectId);
return entries;
}
示例8: getDeltaEntityIterator
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
private CheckedIterator getDeltaEntityIterator(long startVersion, @Nullable Long endVersion,
FetchOptions fetchOptions, boolean forward, boolean keysOnly)
throws PermanentFailure, RetryableFailure {
checkRange(startVersion, endVersion);
if (endVersion != null && startVersion == endVersion) {
return CheckedIterator.EMPTY;
}
Query.Filter filter = FilterOperator.GREATER_THAN_OR_EQUAL.of(Entity.KEY_RESERVED_PROPERTY,
makeDeltaKey(objectId, startVersion));
if (endVersion != null) {
filter = Query.CompositeFilterOperator.and(filter,
FilterOperator.LESS_THAN.of(Entity.KEY_RESERVED_PROPERTY,
makeDeltaKey(objectId, endVersion)));
}
Query q = new Query(deltaEntityKind)
.setAncestor(makeRootEntityKey(objectId))
.setFilter(filter)
.addSort(Entity.KEY_RESERVED_PROPERTY,
forward ? SortDirection.ASCENDING : SortDirection.DESCENDING);
if (keysOnly) {
q.setKeysOnly();
}
return tx.prepare(q).asIterator(fetchOptions);
}
示例9: getSnapshotEntryAtOrBefore
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
@Nullable private SnapshotEntry getSnapshotEntryAtOrBefore(@Nullable Long atOrBeforeVersion)
throws RetryableFailure, PermanentFailure {
Query q = new Query(snapshotEntityKind)
.setAncestor(makeRootEntityKey(objectId))
.addSort(Entity.KEY_RESERVED_PROPERTY, SortDirection.DESCENDING);
if (atOrBeforeVersion != null) {
q.setFilter(FilterOperator.LESS_THAN_OR_EQUAL.of(Entity.KEY_RESERVED_PROPERTY,
makeSnapshotKey(objectId, atOrBeforeVersion)));
}
Entity e = tx.prepare(q).getFirstResult();
log.info("query " + q + " returned first result " + e);
if (e == null) {
return null;
} else {
snapshotPropertyMover.postGet(e);
return parseSnapshot(e);
}
}
示例10: getEntitiesBrowser
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
@GET
@Produces(MediaType.TEXT_XML)
public List<SharedProduct> getEntitiesBrowser() {
List<SharedProduct> list = new ArrayList<SharedProduct>();
DatastoreService datastore = DatastoreServiceFactory
.getDatastoreService();
Query query = new Query("SharedList");
query.addSort(Entity.KEY_RESERVED_PROPERTY, SortDirection.ASCENDING);
List<Entity> results = datastore.prepare(query).asList(
FetchOptions.Builder.withDefaults());
for (Entity entity : results) {
String email = (String) entity.getProperty("email");
String productID = (String) entity.getKey().getName();
String productName = (String) entity.getProperty("productName");
Date sharedDate = (Date) entity.getProperty("sharedDate");
list.add(new SharedProduct(email, productID, productName,
sharedDate));
}
return list;
}
示例11: getEntities
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
@GET
@Produces({ MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON })
public List<SharedProduct> getEntities() {
List<SharedProduct> list = new ArrayList<SharedProduct>();
DatastoreService datastore = DatastoreServiceFactory
.getDatastoreService();
Query query = new Query("SharedList");
query.addSort(Entity.KEY_RESERVED_PROPERTY, SortDirection.ASCENDING);
List<Entity> results = datastore.prepare(query).asList(
FetchOptions.Builder.withDefaults());
for (Entity entity : results) {
String email = (String) entity.getProperty("email");
String productID = (String) entity.getKey().getName();
String productName = (String) entity.getProperty("productName");
Date sharedDate = (Date) entity.getProperty("sharedDate");
list.add(new SharedProduct(email, productID, productName,
sharedDate));
}
return list;
}
示例12: listBooks
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
@Override
public Result<Book> listBooks(String startCursorString) {
FetchOptions fetchOptions = FetchOptions.Builder.withLimit(10); // Only show 10 at a time
if (startCursorString != null && !startCursorString.equals("")) {
fetchOptions.startCursor(Cursor.fromWebSafeString(startCursorString)); // Where we left off
}
Query query = new Query(BOOK_KIND) // We only care about Books
.addSort(Book.TITLE, SortDirection.ASCENDING); // Use default Index "title"
PreparedQuery preparedQuery = datastore.prepare(query);
QueryResultIterator<Entity> results = preparedQuery.asQueryResultIterator(fetchOptions);
List<Book> resultBooks = entitiesToBooks(results); // Retrieve and convert Entities
Cursor cursor = results.getCursor(); // Where to start next time
if (cursor != null && resultBooks.size() == 10) { // Are we paging? Save Cursor
String cursorString = cursor.toWebSafeString(); // Cursors are WebSafe
return new Result<>(resultBooks, cursorString);
} else {
return new Result<>(resultBooks);
}
}
示例13: listBooksByUser
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
@Override
public Result<Book> listBooksByUser(String userId, String startCursorString) {
FetchOptions fetchOptions = FetchOptions.Builder.withLimit(10); // Only show 10 at a time
if (startCursorString != null && !startCursorString.equals("")) {
fetchOptions.startCursor(Cursor.fromWebSafeString(startCursorString)); // Where we left off
}
Query query = new Query(BOOK_KIND) // We only care about Books
// Only for this user
.setFilter(new Query.FilterPredicate(
Book.CREATED_BY_ID, Query.FilterOperator.EQUAL, userId))
// a custom datastore index is required since you are filtering by one property
// but ordering by another
.addSort(Book.TITLE, SortDirection.ASCENDING);
PreparedQuery preparedQuery = datastore.prepare(query);
QueryResultIterator<Entity> results = preparedQuery.asQueryResultIterator(fetchOptions);
List<Book> resultBooks = entitiesToBooks(results); // Retrieve and convert Entities
Cursor cursor = results.getCursor(); // Where to start next time
if (cursor != null && resultBooks.size() == 10) { // Are we paging? Save Cursor
String cursorString = cursor.toWebSafeString(); // Cursors are WebSafe
return new Result<>(resultBooks, cursorString);
} else {
return new Result<>(resultBooks);
}
}
示例14: queryRestrictions_missingSortOnInequality_isInvalid
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
@Test
public void queryRestrictions_missingSortOnInequality_isInvalid() throws Exception {
long minBirthYear = 1940;
// [START inequality_filters_sort_orders_invalid_example_1]
Filter birthYearMinFilter =
new FilterPredicate("birthYear", FilterOperator.GREATER_THAN_OR_EQUAL, minBirthYear);
// Not valid. Missing sort on birthYear.
Query q =
new Query("Person")
.setFilter(birthYearMinFilter)
.addSort("lastName", SortDirection.ASCENDING);
// [END inequality_filters_sort_orders_invalid_example_1]
// Note: The local devserver behavior is different than the production
// version of Cloud Datastore, so there aren't any assertions we can make
// in this test. The query appears to work with the local test runner,
// but will fail in production.
}
示例15: deleteSessionWithValue
import com.google.appengine.api.datastore.Query; //导入依赖的package包/类
protected void deleteSessionWithValue(String varName, String varValue) {
Transaction transaction = datastore.beginTransaction();
try {
Query query = new Query(SESSION_KIND)
.setFilter(new FilterPredicate(varName, FilterOperator.EQUAL, varValue));
Iterator<Entity> results = datastore.prepare(transaction, query).asIterator();
while (results.hasNext()) {
Entity stateEntity = results.next();
datastore.delete(transaction, stateEntity.getKey());
}
transaction.commit();
} finally {
if (transaction.isActive()) {
transaction.rollback();
}
}
}