com.sequoiadb.base

Class DBQuery

java.lang.Object

com.sequoiadb.base.DBQuery

public class DBQuery
extends Object

Query expression of SequoiaDB.

See Also:

DBCollection.query(DBQuery)

Field Summary

Fields

Modifier and Type	Field and Description
static int	FLG_QUERY_FOR_UPDATE When the transaction is turned on and the transaction isolation level is "RC", the transaction lock will be released after the record is read by default.
static int	FLG_QUERY_FORCE_HINT Force to use specified hint to query, if database has no index assigned by the hint, fail to query.
static int	FLG_QUERY_KEEP_SHARDINGKEY_IN_UPDATE The sharding key in update rule is not filtered, when executing queryAndUpdate.
static int	FLG_QUERY_PARALLED Enable parallel sub-query, each sub-query will finish scanning different part of data.
static int	FLG_QUERY_PREPARE_MORE Enable prepare more data when querying.
static int	FLG_QUERY_STRINGOUT Normally, query return bson object, when this flag is added, query return binary data stream
static int	FLG_QUERY_WITH_RETURNDATA In general, query won't return data until cursor gets the record from database, when adding this flag, return data in query response, it will be more high-performance.

Constructor Summary

Constructors

Constructor and Description
DBQuery()

Method Summary

Modifier and Type	Method and Description
int	getFlag()
BSONObject	getHint()
BSONObject	getMatcher()
BSONObject	getModifier()
BSONObject	getOrderBy()
Long	getReturnRowsCount()
BSONObject	getSelector()
Long	getSkipRowsCount()
void	setFlag(int flag) Set the query flag.
void	setHint(BSONObject hint) Set specified access plan.
void	setMatcher(BSONObject matcher) Set matching rule.
void	setModifier(BSONObject modifier) Set modified rule.
void	setOrderBy(BSONObject orderBy) Set ordered rule.
void	setReturnRowsCount(Long returnRowsCount) Set the count of BSONObjects to return.
void	setSelector(BSONObject selector) Set selective rule.
void	setSkipRowsCount(Long skipRowsCount) Set the count of BSONObjects to skip.

Methods inherited from class java.lang.Object

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

Field Detail

FLG_QUERY_FOR_UPDATE

public static final int FLG_QUERY_FOR_UPDATE

When the transaction is turned on and the transaction isolation level is "RC", the transaction lock will be released after the record is read by default. However, when setting this flag, the transaction lock will not be released until the transaction is committed or rollbacked. When the transaction is turned off or the transaction isolation level is "RU", the flag does not work.

See Also:

Constant Field Values

FLG_QUERY_FORCE_HINT

public static final int FLG_QUERY_FORCE_HINT

Force to use specified hint to query, if database has no index assigned by the hint, fail to query.

See Also:

Constant Field Values

FLG_QUERY_KEEP_SHARDINGKEY_IN_UPDATE

public static final int FLG_QUERY_KEEP_SHARDINGKEY_IN_UPDATE

The sharding key in update rule is not filtered, when executing queryAndUpdate.

See Also:

Constant Field Values

FLG_QUERY_PARALLED

public static final int FLG_QUERY_PARALLED

Enable parallel sub-query, each sub-query will finish scanning different part of data.

See Also:

Constant Field Values

FLG_QUERY_PREPARE_MORE

public static final int FLG_QUERY_PREPARE_MORE

Enable prepare more data when querying.

See Also:

Constant Field Values

FLG_QUERY_STRINGOUT

public static final int FLG_QUERY_STRINGOUT

Normally, query return bson object, when this flag is added, query return binary data stream

See Also:

Constant Field Values

FLG_QUERY_WITH_RETURNDATA

public static final int FLG_QUERY_WITH_RETURNDATA

In general, query won't return data until cursor gets the record from database, when adding this flag, return data in query response, it will be more high-performance.

See Also:

Constant Field Values

Constructor Detail

DBQuery

public DBQuery()

Method Detail

getFlag

public int getFlag()

Returns:

The query flag

getHint

public BSONObject getHint()

Returns:

The specified access plan BSONObject

getMatcher

public BSONObject getMatcher()

Returns:

The matching rule BSONObject

getModifier

public BSONObject getModifier()

Returns:

The modified rule BSONObject

getOrderBy

public BSONObject getOrderBy()

Returns:

The ordered rule BSONObject

getReturnRowsCount

public Long getReturnRowsCount()

Returns:

The count of BSONObjects to return

getSelector

public BSONObject getSelector()

Returns:

The selective rule BSONObject.

getSkipRowsCount

public Long getSkipRowsCount()

Returns:

The count of BSONObjects to skip

setFlag

public void setFlag(int flag)

Set the query flag.

Parameters:

flag - The query flag as follow:

• FLG_QUERY_STRINGOUT
• FLG_QUERY_FORCE_HINT
• FLG_QUERY_PARALLED
• FLG_QUERY_WITH_RETURNDATA
• FLG_QUERY_FOR_UPDATE

setHint

public void setHint(BSONObject hint)

Set specified access plan.

Parameters:

hint - The specified access plan BSONObject

setMatcher

public void setMatcher(BSONObject matcher)

Set matching rule.

Parameters:

matcher - The matching rule BSONObject

setModifier

public void setModifier(BSONObject modifier)

Set modified rule.

Parameters:

modifier - The modified rule BSONObject

setOrderBy

public void setOrderBy(BSONObject orderBy)

Set ordered rule.

Parameters:

orderBy - The ordered rule BSONObject

setReturnRowsCount

public void setReturnRowsCount(Long returnRowsCount)

Set the count of BSONObjects to return.

Parameters:

returnRowsCount - The count of BSONObjects to return

setSelector

public void setSelector(BSONObject selector)

Set selective rule.

Parameters:

selector - The selective rule BSONObject

setSkipRowsCount

public void setSkipRowsCount(Long skipRowsCount)

Set the count of BSONObjects to skip.

Parameters:

skipRowsCount - The count of BSONObjects to skip