com.mongodb.operation

类 CountOperation

java.lang.Object

com.mongodb.operation.CountOperation

所有已实现的接口:

AsyncReadOperation<java.lang.Long>, ReadOperation<java.lang.Long>

public class CountOperation
extends java.lang.Object
implements AsyncReadOperation<java.lang.Long>, ReadOperation<java.lang.Long>

An operation that executes a count.

从以下版本开始:

3.0

构造器概要

构造器

构造器和说明
CountOperation(MongoNamespace namespace) Construct a new instance.

方法概要

限定符和类型	方法和说明
ReadOperation<BsonDocument>	asExplainableOperation(ExplainVerbosity explainVerbosity) Gets an operation whose execution explains this operation.
AsyncReadOperation<BsonDocument>	asExplainableOperationAsync(ExplainVerbosity explainVerbosity) Gets an operation whose execution explains this operation.
java.lang.Long	execute(ReadBinding binding) General execute which can return anything of type T
void	executeAsync(AsyncReadBinding binding, SingleResultCallback<java.lang.Long> callback) General execute which can return anything of type T
CountOperation	filter(BsonDocument filter) Sets the filter to apply to the query.
BsonDocument	getFilter() Gets the query filter.
BsonValue	getHint() Gets the hint to apply.
long	getLimit() Gets the limit to apply.
long	getMaxTime(java.util.concurrent.TimeUnit timeUnit) Gets the maximum execution time on the server for this operation.
ReadConcern	getReadConcern() Gets the read concern
long	getSkip() Gets the number of documents to skip.
CountOperation	hint(BsonValue hint) Sets the hint to apply.
CountOperation	limit(long limit) Sets the limit to apply.
CountOperation	maxTime(long maxTime, java.util.concurrent.TimeUnit timeUnit) Sets the maximum execution time on the server for this operation.
CountOperation	readConcern(ReadConcern readConcern) Sets the read concern
CountOperation	skip(long skip) Sets the number of documents to skip.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

CountOperation

public CountOperation(MongoNamespace namespace)

Construct a new instance.

参数:

namespace - the database and collection namespace for the operation.

方法详细资料

getFilter

public BsonDocument getFilter()

Gets the query filter.

返回:

the query filter

MongoDB documentation

filter

filter

public CountOperation filter(BsonDocument filter)

Sets the filter to apply to the query.

参数:

filter - the filter, which may be null.

返回:

this

MongoDB documentation

Filter

getHint

public BsonValue getHint()

Gets the hint to apply.

返回:

the hint, which should describe an existing

hint

public CountOperation hint(BsonValue hint)

Sets the hint to apply.

参数:

hint - a value describing the index which should be used for this operation.

返回:

this

getLimit

public long getLimit()

Gets the limit to apply. The default is 0, which means there is no limit.

返回:

the limit

MongoDB documentation

Limit

limit

public CountOperation limit(long limit)

Sets the limit to apply.

参数:

limit - the limit

返回:

this

MongoDB documentation

Limit

getSkip

public long getSkip()

Gets the number of documents to skip. The default is 0.

返回:

the number of documents to skip, which may be null

MongoDB documentation

Skip

skip

public CountOperation skip(long skip)

Sets the number of documents to skip.

参数:

skip - the number of documents to skip

返回:

this

MongoDB documentation

Skip

getMaxTime

public long getMaxTime(java.util.concurrent.TimeUnit timeUnit)

Gets the maximum execution time on the server for this operation. The default is 0, which places no limit on the execution time.

参数:

timeUnit - the time unit to return the result in

返回:

the maximum execution time in the given time unit

maxTime

public CountOperation maxTime(long maxTime,
                              java.util.concurrent.TimeUnit timeUnit)

Sets the maximum execution time on the server for this operation.

参数:

maxTime - the max time

timeUnit - the time unit, which may not be null

返回:

this

getReadConcern

public ReadConcern getReadConcern()

Gets the read concern

返回:

the read concern

从以下版本开始:

3.2

MongoDB documentation

Read Concern

readConcern

public CountOperation readConcern(ReadConcern readConcern)

Sets the read concern

参数:

readConcern - the read concern

返回:

this

从以下版本开始:

3.2

MongoDB documentation

Read Concern

execute

public java.lang.Long execute(ReadBinding binding)

从接口复制的说明: ReadOperation

General execute which can return anything of type T

指定者:

execute 在接口中 ReadOperation<java.lang.Long>

参数:

binding - the binding to execute in the context of

返回:

T, the result of the execution

executeAsync

public void executeAsync(AsyncReadBinding binding,
                         SingleResultCallback<java.lang.Long> callback)

从接口复制的说明: AsyncReadOperation

General execute which can return anything of type T

指定者:

executeAsync 在接口中 AsyncReadOperation<java.lang.Long>

参数:

binding - the binding to execute in the context of

callback - the callback to be called when the operation has been executed

asExplainableOperation

public ReadOperation<BsonDocument> asExplainableOperation(ExplainVerbosity explainVerbosity)

Gets an operation whose execution explains this operation.

参数:

explainVerbosity - the explain verbosity

返回:

a read operation that when executed will explain this operation

asExplainableOperationAsync

public AsyncReadOperation<BsonDocument> asExplainableOperationAsync(ExplainVerbosity explainVerbosity)

Gets an operation whose execution explains this operation.

参数:

explainVerbosity - the explain verbosity

返回:

a read operation that when executed will explain this operation