public class
Query
extends Object
| Known Direct Subclasses |
The Query class (and its subclass, DatabaseReference) are used for reading data.
Listeners are attached, and they will be triggered when the corresponding data changes.
Instances of Query are obtained by calling startAt(), endAt(), or limit() on a DatabaseReference.
Public Method Summary
| ChildEventListener |
addChildEventListener(ChildEventListener listener)
Add a listener for child events occurring at this location.
|
| void |
addListenerForSingleValueEvent(ValueEventListener listener)
Add a listener for a single change in the data at this location.
|
| ValueEventListener |
addValueEventListener(ValueEventListener listener)
Add a listener for changes in the data at this location.
|
| Query |
endAt(String value, String key)
Create a query constrained to only return child nodes with a value less than or equal to the
given value, using the given orderBy directive or priority as default, and additionally only
child nodes with a key key less than or equal to the given key.
|
| Query |
endAt(String value)
Create a query constrained to only return child nodes with a value less than or equal to the
given value, using the given orderBy directive or priority as default.
|
| Query |
endAt(double value, String key)
Create a query constrained to only return child nodes with a value less than or equal to the
given value, using the given orderBy directive or priority as default, and additionally only
child nodes with a key less than or equal to the given key.
|
| Query |
endAt(double value)
Create a query constrained to only return child nodes with a value less than or equal to the
given value, using the given orderBy directive or priority as default.
|
| Query |
endAt(boolean value)
Create a query constrained to only return child nodes with a value less than or equal to the
given value, using the given orderBy directive or priority as default.
|
| Query |
endAt(boolean value, String key)
Create a query constrained to only return child nodes with a value less than or equal to the
given value, using the given orderBy directive or priority as default, and additionally only
child nodes with a key less than or equal to the given key.
|
| Query |
equalTo(String value, String key)
Create a query constrained to only return the child node with the given key and value.
|
| Query |
equalTo(double value)
Create a query constrained to only return child nodes with the given value.
|
| Query |
equalTo(double value, String key)
Create a query constrained to only return the child node with the given key and value.
|
| Query |
equalTo(String value)
Create a query constrained to only return child nodes with the given value.
|
| Query |
equalTo(boolean value, String key)
Create a query constrained to only return the child node with the given key and value.
|
| Query |
equalTo(boolean value)
Create a query constrained to only return child nodes with the given value.
|
| DatabaseReference |
getRef()
|
| void |
keepSynced(boolean keepSynced)
By calling
keepSynced(true) on a location, the data for that location will
automatically be downloaded and kept in sync, even when no listeners are attached for that
location. |
| Query |
limitToFirst(int limit)
Create a query with limit and anchor it to the start of the window.
|
| Query |
limitToLast(int limit)
Create a query with limit and anchor it to the end of the window.
|
| Query |
orderByChild(String path)
Create a query in which child nodes are ordered by the values of the specified path.
|
| Query |
orderByKey()
Create a query in which child nodes are ordered by their keys.
|
| Query |
orderByPriority()
Create a query in which child nodes are ordered by their priorities.
|
| Query |
orderByValue()
Create a query in which nodes are ordered by their value
|
| void | |
| void | |
| Query |
startAt(double value)
Create a query constrained to only return child nodes with a value greater than or equal to the
given value, using the given orderBy directive or priority as default.
|
| Query |
startAt(String value, String key)
Create a query constrained to only return child nodes with a value greater than or equal to the
given value, using the given orderBy directive or priority as default, and additionally only
child nodes with a key greater than or equal to the given key.
|
| Query |
startAt(String value)
Create a query constrained to only return child nodes with a value greater than or equal to the
given value, using the given orderBy directive or priority as default.
|
| Query |
startAt(double value, String key)
Create a query constrained to only return child nodes with a value greater than or equal to the
given value, using the given orderBy directive or priority as default, and additionally only
child nodes with a key greater than or equal to the given key.
|
| Query |
startAt(boolean value)
Create a query constrained to only return child nodes with a value greater than or equal to the
given value, using the given orderBy directive or priority as default.
|
| Query |
startAt(boolean value, String key)
Create a query constrained to only return child nodes with a value greater than or equal to the
given value, using the given orderBy directive or priority as default, and additionally only
child nodes with a key greater than or equal to the given key.
|