org.h2.command

Class CommandContainer

java.lang.Object

org.h2.command.Command

org.h2.command.CommandContainer

All Implemented Interfaces:

CommandInterface

public class CommandContainer
extends Command

Represents a single SQL statements. It wraps a prepared statement.

Field Summary

Fields inherited from class org.h2.command.Command

session, startTimeNanos

Fields inherited from interface org.h2.command.CommandInterface

ALTER_INDEX_RENAME, ALTER_SCHEMA_RENAME, ALTER_SEQUENCE, ALTER_TABLE_ADD_COLUMN, ALTER_TABLE_ADD_CONSTRAINT_CHECK, ALTER_TABLE_ADD_CONSTRAINT_PRIMARY_KEY, ALTER_TABLE_ADD_CONSTRAINT_REFERENTIAL, ALTER_TABLE_ADD_CONSTRAINT_UNIQUE, ALTER_TABLE_ALTER_COLUMN_CHANGE_TYPE, ALTER_TABLE_ALTER_COLUMN_DEFAULT, ALTER_TABLE_ALTER_COLUMN_NOT_NULL, ALTER_TABLE_ALTER_COLUMN_NULL, ALTER_TABLE_ALTER_COLUMN_ON_UPDATE, ALTER_TABLE_ALTER_COLUMN_RENAME, ALTER_TABLE_ALTER_COLUMN_SELECTIVITY, ALTER_TABLE_ALTER_COLUMN_VISIBILITY, ALTER_TABLE_DROP_COLUMN, ALTER_TABLE_DROP_CONSTRAINT, ALTER_TABLE_RENAME, ALTER_TABLE_RENAME_CONSTRAINT, ALTER_TABLE_SET_REFERENTIAL_INTEGRITY, ALTER_USER_ADMIN, ALTER_USER_RENAME, ALTER_USER_SET_PASSWORD, ALTER_VIEW, ANALYZE, BACKUP, BEGIN, CALL, CHECKPOINT, CHECKPOINT_SYNC, COMMENT, COMMIT, COMMIT_TRANSACTION, CREATE_AGGREGATE, CREATE_ALIAS, CREATE_CONSTANT, CREATE_DOMAIN, CREATE_INDEX, CREATE_LINKED_TABLE, CREATE_ROLE, CREATE_SCHEMA, CREATE_SEQUENCE, CREATE_SYNONYM, CREATE_TABLE, CREATE_TRIGGER, CREATE_USER, CREATE_VIEW, DEALLOCATE, DELETE, DROP_AGGREGATE, DROP_ALIAS, DROP_ALL_OBJECTS, DROP_CONSTANT, DROP_DOMAIN, DROP_INDEX, DROP_ROLE, DROP_SCHEMA, DROP_SEQUENCE, DROP_SYNONYM, DROP_TABLE, DROP_TRIGGER, DROP_USER, DROP_VIEW, EXECUTE, EXPLAIN, EXPLAIN_ANALYZE, GRANT, INSERT, MERGE, NO_OPERATION, PREPARE, PREPARE_COMMIT, REPLACE, REVOKE, ROLLBACK, ROLLBACK_TO_SAVEPOINT, ROLLBACK_TRANSACTION, RUNSCRIPT, SAVEPOINT, SCRIPT, SELECT, SET, SET_AUTOCOMMIT_FALSE, SET_AUTOCOMMIT_TRUE, SHUTDOWN, SHUTDOWN_COMPACT, SHUTDOWN_DEFRAG, SHUTDOWN_IMMEDIATELY, TRUNCATE_TABLE, UNKNOWN, UPDATE

Method Summary

Modifier and Type	Method and Description
boolean	canReuse() Whether the command is already closed (in which case it can be re-used).
int	getCommandType() Get command type.
java.util.ArrayList<? extends ParameterInterface>	getParameters() Get the list of parameters.
boolean	isCacheable()
boolean	isQuery() Check if this command is a query.
boolean	isReadOnly() Check if this command is read only.
boolean	isTransactional() Check if this command is transactional.
void	prepareJoinBatch() Prepare join batching.
ResultInterface	query(int maxrows) Execute a query statement, if this is possible.
ResultInterface	queryMeta() Get an empty result set containing the meta data.
void	stop() Stop the command execution, release all locks and resources
int	update() Execute an updating statement (for example insert, delete, or update), if this is possible.

Methods inherited from class org.h2.command.Command

cancel, checkCanceled, close, executeQuery, executeUpdate, getMetaData, reuse, setCanReuse, toString

Methods inherited from class java.lang.Object

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

Method Detail

getParameters

public java.util.ArrayList<? extends ParameterInterface> getParameters()

Description copied from class: Command

Get the list of parameters.

Specified by:

getParameters in interface CommandInterface

Specified by:

getParameters in class Command

Returns:

the list of parameters

isTransactional

public boolean isTransactional()

Description copied from class: Command

Check if this command is transactional. If it is not, then it forces the current transaction to commit.

Specified by:

isTransactional in class Command

Returns:

true if it is

isQuery

public boolean isQuery()

Description copied from class: Command

Check if this command is a query.

Specified by:

isQuery in interface CommandInterface

Specified by:

isQuery in class Command

Returns:

true if it is

prepareJoinBatch

public void prepareJoinBatch()

Description copied from class: Command

Prepare join batching.

Specified by:

prepareJoinBatch in class Command

update

public int update()

Description copied from class: Command

Execute an updating statement (for example insert, delete, or update), if this is possible.

Overrides:

update in class Command

Returns:

the update count

query

public ResultInterface query(int maxrows)

Description copied from class: Command

Execute a query statement, if this is possible.

Overrides:

query in class Command

Parameters:

maxrows - the maximum number of rows returned

Returns:

the local result set

stop

public void stop()

Description copied from interface: CommandInterface

Stop the command execution, release all locks and resources

Specified by:

stop in interface CommandInterface

Overrides:

stop in class Command

canReuse

public boolean canReuse()

Description copied from class: Command

Whether the command is already closed (in which case it can be re-used).

Overrides:

canReuse in class Command

Returns:

true if it can be re-used

isReadOnly

public boolean isReadOnly()

Description copied from class: Command

Check if this command is read only.

Specified by:

isReadOnly in class Command

Returns:

true if it is

queryMeta

public ResultInterface queryMeta()

Description copied from class: Command

Get an empty result set containing the meta data.

Specified by:

queryMeta in class Command

Returns:

an empty result set

isCacheable

public boolean isCacheable()

Overrides:

isCacheable in class Command

getCommandType

public int getCommandType()

Description copied from interface: CommandInterface

Get command type.

Returns:

one of the constants above