Package org.h2.command

Class CommandContainer

java.lang.Object

org.h2.command.Command

org.h2.command.CommandContainer

All Implemented Interfaces:

AutoCloseable, 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_DOMAIN_ADD_CONSTRAINT, ALTER_DOMAIN_DEFAULT, ALTER_DOMAIN_DROP_CONSTRAINT, ALTER_DOMAIN_ON_UPDATE, ALTER_DOMAIN_RENAME, ALTER_DOMAIN_RENAME_CONSTRAINT, 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_DEFAULT_ON_NULL, ALTER_TABLE_ALTER_COLUMN_DROP_EXPRESSION, ALTER_TABLE_ALTER_COLUMN_DROP_IDENTITY, ALTER_TABLE_ALTER_COLUMN_DROP_NOT_NULL, ALTER_TABLE_ALTER_COLUMN_NOT_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_TYPE, 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_MATERIALIZED_VIEW, 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_MATERIALIZED_VIEW, DROP_ROLE, DROP_SCHEMA, DROP_SEQUENCE, DROP_SYNONYM, DROP_TABLE, DROP_TRIGGER, DROP_USER, DROP_VIEW, EXECUTE, EXECUTE_IMMEDIATELY, EXPLAIN, EXPLAIN_ANALYZE, GRANT, HELP, INSERT, MERGE, NO_OPERATION, PREPARE, PREPARE_COMMIT, REFRESH_MATERIALIZED_VIEW, 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

Constructor Summary

Constructors

Constructor	Description
CommandContainer(SessionLocal session, String sql, Prepared prepared)

Method Summary

Modifier and Type	Method	Description
int	getCommandType()	Get command type.
Set<DbObject>	getDependencies()	Collect all database objects, this command depends on
ArrayList<? extends ParameterInterface>	getParameters()	Get the list of parameters.
void	invalidateCachedResult(Table reason)	Clear cached results of all prepared statements, which depends on a given table
boolean	isCacheable()
boolean	isQuery()	Check if this command is a query.
boolean	isReadOnly()	Check if this command is read only.
protected boolean	isRetryable()	Checks if this command can be repeated on locking failure.
boolean	isTransactional()	Check if this command is transactional.
ResultInterface	query(long maxrows)	Execute a query statement, if this is possible.
ResultInterface	queryMeta()	Get an empty result set containing the metadata.
ResultWithGeneratedKeys	update(Object generatedKeysRequest)	Execute an updating statement (for example insert, delete, or update), if this is possible.

Methods inherited from class org.h2.command.Command

cancel, canReuse, checkCanceled, close, executeBatchUpdate, executeQuery, executeUpdate, getDatabase, getMetaData, reuse, stop, toString

Methods inherited from class java.lang.Object

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

Constructor Details

CommandContainer

public CommandContainer(SessionLocal session,
 String sql,
 Prepared prepared)

Method Details

getParameters

public 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

update

public ResultWithGeneratedKeys update(Object generatedKeysRequest)

Description copied from class: Command

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

Specified by:

update in class Command

Parameters:

generatedKeysRequest - false if generated keys are not needed, true if generated keys should be configured automatically, int[] to specify column indices to return generated keys from, or String[] to specify column names to return generated keys from

Returns:

the update count and generated keys, if any

query

public ResultInterface query(long maxrows)

Description copied from class: Command

Execute a query statement, if this is possible.

Specified by:

query in class Command

Parameters:

maxrows - the maximum number of rows returned

Returns:

the local result set

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 metadata.

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

getDependencies

public Set<DbObject> getDependencies()

Description copied from class: Command

Collect all database objects, this command depends on

Specified by:

getDependencies in class Command

Returns:

Set of dependencies

invalidateCachedResult

public void invalidateCachedResult(Table reason)

Description copied from class: Command

Clear cached results of all prepared statements, which depends on a given table

Specified by:

invalidateCachedResult in class Command

Parameters:

reason - table causing invalidation

isRetryable

protected boolean isRetryable()

Description copied from class: Command

Checks if this command can be repeated on locking failure.

Specified by:

isRetryable in class Command

Returns:

true if this command can be repeated on locking failure