QueryOptions (DataStax Java Driver for Apache Cassandra

java.lang.Object
- com.datastax.driver.core.QueryOptions

```
public class QueryOptions
extends Object
```
Options related to defaults for individual queries.

Field Summary

Fields
Modifier and Type	Field and Description
`static ConsistencyLevel`	`DEFAULT_CONSISTENCY_LEVEL` The default consistency level for queries: `ConsistencyLevel.ONE`.
`static int`	`DEFAULT_FETCH_SIZE` The default fetch size for SELECT queries: 5000.
`static boolean`	`DEFAULT_IDEMPOTENCE` The default value for `getDefaultIdempotence()`: `false`.
`static int`	`DEFAULT_MAX_PENDING_REFRESH_NODE_LIST_REQUESTS`
`static int`	`DEFAULT_MAX_PENDING_REFRESH_NODE_REQUESTS`
`static int`	`DEFAULT_MAX_PENDING_REFRESH_SCHEMA_REQUESTS`
`static int`	`DEFAULT_REFRESH_NODE_INTERVAL_MILLIS`
`static int`	`DEFAULT_REFRESH_NODE_LIST_INTERVAL_MILLIS`
`static int`	`DEFAULT_REFRESH_SCHEMA_INTERVAL_MILLIS`
`static ConsistencyLevel`	`DEFAULT_SERIAL_CONSISTENCY_LEVEL` The default serial consistency level for conditional updates: `ConsistencyLevel.SERIAL`.

Constructor Summary

Constructors
Constructor and Description

QueryOptions()
Creates a new QueryOptions instance using the DEFAULT_CONSISTENCY_LEVEL, DEFAULT_SERIAL_CONSISTENCY_LEVEL and DEFAULT_FETCH_SIZE.

Constructors
Constructor and Description
`QueryOptions()` Creates a new `QueryOptions` instance using the `DEFAULT_CONSISTENCY_LEVEL`, `DEFAULT_SERIAL_CONSISTENCY_LEVEL` and `DEFAULT_FETCH_SIZE`.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`ConsistencyLevel`	`getConsistencyLevel()` The default consistency level used by queries.
`boolean`	`getDefaultIdempotence()` The default idempotence for queries.
`int`	`getFetchSize()` The default fetch size used by queries.
`int`	`getMaxPendingRefreshNodeListRequests()` Sets the maximum number of node list refresh requests that the control connection can accumulate before executing them.
`int`	`getMaxPendingRefreshNodeRequests()` The maximum number of node refresh requests that the control connection can accumulate before executing them.
`int`	`getMaxPendingRefreshSchemaRequests()` The maximum number of schema refresh requests that the control connection can accumulate before executing them.
`int`	`getRefreshNodeIntervalMillis()` The default window size in milliseconds used to debounce node refresh requests.
`int`	`getRefreshNodeListIntervalMillis()` The default window size in milliseconds used to debounce node list refresh requests.
`int`	`getRefreshSchemaIntervalMillis()` The default window size in milliseconds used to debounce schema refresh requests.
`ConsistencyLevel`	`getSerialConsistencyLevel()` The default serial consistency level used by queries.
`boolean`	`isMetadataEnabled()` Whether client-side token and schema metadata is enabled.
`boolean`	`isPrepareOnAllHosts()` Returns whether the driver should prepare statements on all hosts in the cluster.
`boolean`	`isReprepareOnUp()` Whether the driver should re-prepare all cached prepared statements on a host when its marks that host back up.
`QueryOptions`	`setConsistencyLevel(ConsistencyLevel consistencyLevel)` Sets the default consistency level to use for queries.
`QueryOptions`	`setDefaultIdempotence(boolean defaultIdempotence)` Sets the default idempotence for queries.
`QueryOptions`	`setFetchSize(int fetchSize)` Sets the default fetch size to use for SELECT queries.
`QueryOptions`	`setMaxPendingRefreshNodeListRequests(int maxPendingRefreshNodeListRequests)` Sets the maximum number of node list refresh requests that the control connection can accumulate before executing them.
`QueryOptions`	`setMaxPendingRefreshNodeRequests(int maxPendingRefreshNodeRequests)` Sets the maximum number of node refresh requests that the control connection can accumulate before executing them.
`QueryOptions`	`setMaxPendingRefreshSchemaRequests(int maxPendingRefreshSchemaRequests)` Sets the maximum number of schema refresh requests that the control connection can accumulate before executing them.
`QueryOptions`	`setMetadataEnabled(boolean enabled)` Toggle client-side token and schema metadata.
`QueryOptions`	`setPrepareOnAllHosts(boolean prepareOnAllHosts)` Set whether the driver should prepare statements on all hosts in the cluster.
`QueryOptions`	`setRefreshNodeIntervalMillis(int refreshNodeIntervalMillis)` Sets the default window size in milliseconds used to debounce node refresh requests.
`QueryOptions`	`setRefreshNodeListIntervalMillis(int refreshNodeListIntervalMillis)` Sets the default window size in milliseconds used to debounce node list refresh requests.
`QueryOptions`	`setRefreshSchemaIntervalMillis(int refreshSchemaIntervalMillis)` Sets the default window size in milliseconds used to debounce node list refresh requests.
`QueryOptions`	`setReprepareOnUp(boolean reprepareOnUp)` Set whether the driver should re-prepare all cached prepared statements on a host when it marks it back up.
`QueryOptions`	`setSerialConsistencyLevel(ConsistencyLevel serialConsistencyLevel)` Sets the default serial consistency level to use for queries.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - DEFAULT_CONSISTENCY_LEVEL
```
public static final ConsistencyLevel DEFAULT_CONSISTENCY_LEVEL
```
    The default consistency level for queries: ConsistencyLevel.ONE.
  - DEFAULT_SERIAL_CONSISTENCY_LEVEL
```
public static final ConsistencyLevel DEFAULT_SERIAL_CONSISTENCY_LEVEL
```
    The default serial consistency level for conditional updates: ConsistencyLevel.SERIAL.
  - DEFAULT_FETCH_SIZE
```
public static final int DEFAULT_FETCH_SIZE
```
    The default fetch size for SELECT queries: 5000.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_IDEMPOTENCE
```
public static final boolean DEFAULT_IDEMPOTENCE
```
    The default value for getDefaultIdempotence(): false.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_MAX_PENDING_REFRESH_NODE_LIST_REQUESTS
```
public static final int DEFAULT_MAX_PENDING_REFRESH_NODE_LIST_REQUESTS
```
    See Also:
    
    Constant Field Values
  - DEFAULT_MAX_PENDING_REFRESH_NODE_REQUESTS
```
public static final int DEFAULT_MAX_PENDING_REFRESH_NODE_REQUESTS
```
    See Also:
    
    Constant Field Values
  - DEFAULT_MAX_PENDING_REFRESH_SCHEMA_REQUESTS
```
public static final int DEFAULT_MAX_PENDING_REFRESH_SCHEMA_REQUESTS
```
    See Also:
    
    Constant Field Values
  - DEFAULT_REFRESH_NODE_LIST_INTERVAL_MILLIS
```
public static final int DEFAULT_REFRESH_NODE_LIST_INTERVAL_MILLIS
```
    See Also:
    
    Constant Field Values
  - DEFAULT_REFRESH_NODE_INTERVAL_MILLIS
```
public static final int DEFAULT_REFRESH_NODE_INTERVAL_MILLIS
```
    See Also:
    
    Constant Field Values
  - DEFAULT_REFRESH_SCHEMA_INTERVAL_MILLIS
```
public static final int DEFAULT_REFRESH_SCHEMA_INTERVAL_MILLIS
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - QueryOptions
```
public QueryOptions()
```
    Creates a new QueryOptions instance using the DEFAULT_CONSISTENCY_LEVEL, DEFAULT_SERIAL_CONSISTENCY_LEVEL and DEFAULT_FETCH_SIZE.
- Method Detail
  - setConsistencyLevel
```
public QueryOptions setConsistencyLevel(ConsistencyLevel consistencyLevel)
```
    Sets the default consistency level to use for queries.
    The consistency level set through this method will be use for queries that don't explicitly have a consistency level, i.e. when Statement.getConsistencyLevel() returns null.
    
    Parameters:
    
    consistencyLevel - the new consistency level to set as default.
    
    Returns:
    
    this QueryOptions instance.
  - getConsistencyLevel
```
public ConsistencyLevel getConsistencyLevel()
```
    The default consistency level used by queries.
    
    Returns:
    
    the default consistency level used by queries.
  - setSerialConsistencyLevel
```
public QueryOptions setSerialConsistencyLevel(ConsistencyLevel serialConsistencyLevel)
```
    Sets the default serial consistency level to use for queries.
    The serial consistency level set through this method will be use for queries that don't explicitly have a serial consistency level, i.e. when Statement.getSerialConsistencyLevel() returns null.
    
    Parameters:
    
    serialConsistencyLevel - the new serial consistency level to set as default.
    
    Returns:
    
    this QueryOptions instance.
  - getSerialConsistencyLevel
```
public ConsistencyLevel getSerialConsistencyLevel()
```
    The default serial consistency level used by queries.
    
    Returns:
    
    the default serial consistency level used by queries.
  - setFetchSize
```
public QueryOptions setFetchSize(int fetchSize)
```
    Sets the default fetch size to use for SELECT queries.
    The fetch size set through this method will be use for queries that don't explicitly have a fetch size, i.e. when Statement.getFetchSize() is less or equal to 0.
    
    Parameters:
    
    fetchSize - the new fetch size to set as default. It must be strictly positive but you can use Integer.MAX_VALUE to disable paging.
    
    Returns:
    
    this QueryOptions instance.
    
    Throws:
    
    IllegalArgumentException - if fetchSize &lte; 0.
    
    UnsupportedFeatureException - if version 1 of the native protocol is in use and fetchSize != Integer.MAX_VALUE as paging is not supported by version 1 of the protocol. See Cluster.Builder.withProtocolVersion(com.datastax.driver.core.ProtocolVersion) for more details on protocol versions.
  - getFetchSize
```
public int getFetchSize()
```
    The default fetch size used by queries.
    
    Returns:
    
    the default fetch size used by queries.
  - setDefaultIdempotence
```
public QueryOptions setDefaultIdempotence(boolean defaultIdempotence)
```
    Sets the default idempotence for queries.
    This will be used for statements for which Statement.isIdempotent() returns null.
    
    Parameters:
    
    defaultIdempotence - the new value to set as default idempotence.
    
    Returns:
    
    this QueryOptions instance.
  - getDefaultIdempotence
```
public boolean getDefaultIdempotence()
```
    The default idempotence for queries.
    It defaults to DEFAULT_IDEMPOTENCE.
    
    Returns:
    
    the default idempotence for queries.
  - setPrepareOnAllHosts
```
public QueryOptions setPrepareOnAllHosts(boolean prepareOnAllHosts)
```
    Set whether the driver should prepare statements on all hosts in the cluster.
    A statement is normally prepared in two steps:
    1. prepare the query on a single host in the cluster;
    2. if that succeeds, prepare on all other hosts.
    This option controls whether step 2 is executed. It is enabled by default.
    The reason why you might want to disable it is to optimize network usage if you have a large number of clients preparing the same set of statements at startup. If your load balancing policy distributes queries randomly, each client will pick a different host to prepare its statements, and on the whole each host has a good chance of having been hit by at least one client for each statement.
    On the other hand, if that assumption turns out to be wrong and one host hasn't prepared a given statement, it needs to be re-prepared on the fly the first time it gets executed; this causes a performance penalty (one extra roundtrip to resend the query to prepare, and another to retry the execution).
    Parameters:
    
    prepareOnAllHosts - the new value to set to indicate whether to prepare statements once or on all nodes.
    
    Returns:
    
    this QueryOptions instance.
  - isPrepareOnAllHosts
```
public boolean isPrepareOnAllHosts()
```
    Returns whether the driver should prepare statements on all hosts in the cluster.
    
    Returns:
    
    the value.
    
    See Also:
    
    setPrepareOnAllHosts(boolean)
  - setReprepareOnUp
```
public QueryOptions setReprepareOnUp(boolean reprepareOnUp)
```
    Set whether the driver should re-prepare all cached prepared statements on a host when it marks it back up.
    This option is enabled by default.
    The reason why you might want to disable it is to optimize reconnection time when you believe hosts often get marked down because of temporary network issues, rather than the host really crashing. In that case, the host still has prepared statements in its cache when the driver reconnects, so re-preparing is redundant.
    On the other hand, if that assumption turns out to be wrong and the host had really restarted, its prepared statement cache is empty, and statements need to be re-prepared on the fly the first time they get executed; this causes a performance penalty (one extra roundtrip to resend the query to prepare, and another to retry the execution).
    
    Parameters:
    
    reprepareOnUp - whether the driver should re-prepare when marking a node up.
    
    Returns:
    
    this QueryOptions instance.
  - isReprepareOnUp
```
public boolean isReprepareOnUp()
```
    Whether the driver should re-prepare all cached prepared statements on a host when its marks that host back up.
    
    Returns:
    
    the value.
    
    See Also:
    
    setReprepareOnUp(boolean)
  - setMetadataEnabled
```
public QueryOptions setMetadataEnabled(boolean enabled)
```
    Toggle client-side token and schema metadata.
    This feature is enabled by default. Some applications might wish to disable it in order to eliminate the overhead of querying the metadata and building its client-side representation. However, take note that doing so will have important consequences:
    - most schema- or token-related methods in Metadata will return stale or null/empty results (see the javadoc of each method for details);
    - Metadata.newToken(String) and Metadata.newTokenRange(Token, Token) will throw an exception if metadata was disabled before startup;
    - token-aware routing will not work properly: if metadata was never initialized, TokenAwarePolicy will always delegate to its child policy. Otherwise, it might not pick the best coordinator (i.e. chose a host that is not a replica for the statement's routing key). In addition, statements prepared while the metadata was disabled might also be sent to a non-optimal coordinator, even if metadata was re-enabled later.
    Parameters:
    
    enabled - whether metadata is enabled.
    
    Returns:
    
    this QueryOptions instance.
  - isMetadataEnabled
```
public boolean isMetadataEnabled()
```
    Whether client-side token and schema metadata is enabled.
    
    Returns:
    
    the value.
    
    See Also:
    
    setMetadataEnabled(boolean)
  - setRefreshSchemaIntervalMillis
```
public QueryOptions setRefreshSchemaIntervalMillis(int refreshSchemaIntervalMillis)
```
    Sets the default window size in milliseconds used to debounce node list refresh requests.
    When the control connection receives a new schema refresh request, it puts it on hold and starts a timer, cancelling any previous running timer; when a timer expires, then the pending requests are coalesced and executed as a single request.
    
    Parameters:
    
    refreshSchemaIntervalMillis - The default window size in milliseconds used to debounce schema refresh requests.
  - getRefreshSchemaIntervalMillis
```
public int getRefreshSchemaIntervalMillis()
```
    The default window size in milliseconds used to debounce schema refresh requests.
    
    Returns:
    
    The default window size in milliseconds used to debounce schema refresh requests.
  - setMaxPendingRefreshSchemaRequests
```
public QueryOptions setMaxPendingRefreshSchemaRequests(int maxPendingRefreshSchemaRequests)
```
    Sets the maximum number of schema refresh requests that the control connection can accumulate before executing them.
    When the control connection receives a new schema refresh request, it puts it on hold and starts a timer, cancelling any previous running timer; if the control connection receives too many events, is parameter allows to trigger execution of pending requests, event if the last timer is still running.
    
    Parameters:
    
    maxPendingRefreshSchemaRequests - The maximum number of schema refresh requests that the control connection can accumulate before executing them.
  - getMaxPendingRefreshSchemaRequests
```
public int getMaxPendingRefreshSchemaRequests()
```
    The maximum number of schema refresh requests that the control connection can accumulate before executing them.
    
    Returns:
    
    The maximum number of schema refresh requests that the control connection can accumulate before executing them.
  - setRefreshNodeListIntervalMillis
```
public QueryOptions setRefreshNodeListIntervalMillis(int refreshNodeListIntervalMillis)
```
    Sets the default window size in milliseconds used to debounce node list refresh requests.
    When the control connection receives a new node list refresh request, it puts it on hold and starts a timer, cancelling any previous running timer; when a timer expires, then the pending requests are coalesced and executed as a single request.
    
    Parameters:
    
    refreshNodeListIntervalMillis - The default window size in milliseconds used to debounce node list refresh requests.
  - getRefreshNodeListIntervalMillis
```
public int getRefreshNodeListIntervalMillis()
```
    The default window size in milliseconds used to debounce node list refresh requests.
    
    Returns:
    
    The default window size in milliseconds used to debounce node list refresh requests.
  - setMaxPendingRefreshNodeListRequests
```
public QueryOptions setMaxPendingRefreshNodeListRequests(int maxPendingRefreshNodeListRequests)
```
    Sets the maximum number of node list refresh requests that the control connection can accumulate before executing them.
    When the control connection receives a new node list refresh request, it puts it on hold and starts a timer, cancelling any previous running timer; if the control connection receives too many events, is parameter allows to trigger execution of pending requests, event if the last timer is still running.
    
    Parameters:
    
    maxPendingRefreshNodeListRequests - The maximum number of node list refresh requests that the control connection can accumulate before executing them.
  - getMaxPendingRefreshNodeListRequests
```
public int getMaxPendingRefreshNodeListRequests()
```
    Sets the maximum number of node list refresh requests that the control connection can accumulate before executing them.
    
    Returns:
    
    The maximum number of node list refresh requests that the control connection can accumulate before executing them.
  - setRefreshNodeIntervalMillis
```
public QueryOptions setRefreshNodeIntervalMillis(int refreshNodeIntervalMillis)
```
    Sets the default window size in milliseconds used to debounce node refresh requests.
    When the control connection receives a new node refresh request, it puts it on hold and starts a timer, cancelling any previous running timer; when a timer expires, then the pending requests are coalesced and executed as a single request.
    
    Parameters:
    
    refreshNodeIntervalMillis - The default window size in milliseconds used to debounce node refresh requests.
  - getRefreshNodeIntervalMillis
```
public int getRefreshNodeIntervalMillis()
```
    The default window size in milliseconds used to debounce node refresh requests.
    
    Returns:
    
    The default window size in milliseconds used to debounce node refresh requests.
  - setMaxPendingRefreshNodeRequests
```
public QueryOptions setMaxPendingRefreshNodeRequests(int maxPendingRefreshNodeRequests)
```
    Sets the maximum number of node refresh requests that the control connection can accumulate before executing them.
    When the control connection receives a new node refresh request, it puts it on hold and starts a timer, cancelling any previous running timer; if the control connection receives too many events, is parameter allows to trigger execution of pending requests, event if the last timer is still running.
    
    Parameters:
    
    maxPendingRefreshNodeRequests - The maximum number of node refresh requests that the control connection can accumulate before executing them.
  - getMaxPendingRefreshNodeRequests
```
public int getMaxPendingRefreshNodeRequests()
```
    The maximum number of node refresh requests that the control connection can accumulate before executing them.
    
    Returns:
    
    The maximum number of node refresh requests that the control connection can accumulate before executing them.

Class QueryOptions

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_CONSISTENCY_LEVEL

DEFAULT_SERIAL_CONSISTENCY_LEVEL

DEFAULT_FETCH_SIZE

DEFAULT_IDEMPOTENCE

DEFAULT_MAX_PENDING_REFRESH_NODE_LIST_REQUESTS

DEFAULT_MAX_PENDING_REFRESH_NODE_REQUESTS

DEFAULT_MAX_PENDING_REFRESH_SCHEMA_REQUESTS

DEFAULT_REFRESH_NODE_LIST_INTERVAL_MILLIS

DEFAULT_REFRESH_NODE_INTERVAL_MILLIS

DEFAULT_REFRESH_SCHEMA_INTERVAL_MILLIS

Constructor Detail

QueryOptions

Method Detail

setConsistencyLevel

getConsistencyLevel

setSerialConsistencyLevel

getSerialConsistencyLevel

setFetchSize

getFetchSize

setDefaultIdempotence

getDefaultIdempotence

setPrepareOnAllHosts

isPrepareOnAllHosts

setReprepareOnUp

isReprepareOnUp

setMetadataEnabled

isMetadataEnabled

setRefreshSchemaIntervalMillis

getRefreshSchemaIntervalMillis

setMaxPendingRefreshSchemaRequests

getMaxPendingRefreshSchemaRequests

setRefreshNodeListIntervalMillis

getRefreshNodeListIntervalMillis

setMaxPendingRefreshNodeListRequests

getMaxPendingRefreshNodeListRequests

setRefreshNodeIntervalMillis

getRefreshNodeIntervalMillis

setMaxPendingRefreshNodeRequests

getMaxPendingRefreshNodeRequests