org.h2.command.dml

类 Explain

java.lang.Object

org.h2.command.Prepared

org.h2.command.dml.Explain

public class Explain
extends Prepared

This class represents the statement EXPLAIN

字段概要

从类继承的字段 org.h2.command.Prepared

create, parameters, prepareAlways, session, sqlStatement, sqlTokens

构造器概要

构造器

构造器和说明
Explain(SessionLocal session)

方法概要

限定符和类型	方法和说明
protected void	checkParameters() Check if all parameters have been set.
void	collectDependencies(HashSet<DbObject> dependencies) Find and collect all DbObjects, this Prepared depends on.
Prepared	getCommand()
int	getType() Get the command type as defined in CommandInterface
boolean	isQuery() Check if this object is a query.
boolean	isReadOnly() Check if this command is read only.
boolean	isTransactional() Check if this command is transactional.
void	prepare() Prepare this statement.
ResultInterface	query(long maxrows) Execute the query.
ResultInterface	queryMeta() Get an empty result set containing the meta data.
void	setCommand(Prepared command)
void	setExecuteCommand(boolean executeCommand)

从类继承的方法 org.h2.command.Prepared

checkCanceled, getCteCleanups, getCurrentRowNumber, getObjectId, getParameters, getPersistedObjectId, getPlanSQL, getSession, getSimpleSQL, getSQL, getSQLTokens, isCacheable, isWithParamValues, needRecompile, setCommand, setCteCleanups, setCurrentRowNumber, setParameterList, setPersistedObjectId, setPrepareAlways, setRow, setSession, setSQL, setWithParamValues, toString, update

从类继承的方法 java.lang.Object

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

构造器详细资料

Explain

public Explain(SessionLocal session)

方法详细资料

setCommand

public void setCommand(Prepared command)

getCommand

public Prepared getCommand()

prepare

public void prepare()

从类复制的说明: Prepared

Prepare this statement.

覆盖:

prepare 在类中 Prepared

setExecuteCommand

public void setExecuteCommand(boolean executeCommand)

queryMeta

public ResultInterface queryMeta()

从类复制的说明: Prepared

Get an empty result set containing the meta data.

指定者:

queryMeta 在类中 Prepared

返回:

the result set

checkParameters

protected void checkParameters()

从类复制的说明: Prepared

Check if all parameters have been set.

覆盖:

checkParameters 在类中 Prepared

query

public ResultInterface query(long maxrows)

从类复制的说明: Prepared

Execute the query.

覆盖:

query 在类中 Prepared

参数:

maxrows - the maximum number of rows to return

返回:

the result set

isQuery

public boolean isQuery()

从类复制的说明: Prepared

Check if this object is a query.

覆盖:

isQuery 在类中 Prepared

返回:

true if it is

isTransactional

public boolean isTransactional()

从类复制的说明: Prepared

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

指定者:

isTransactional 在类中 Prepared

返回:

true if it is

isReadOnly

public boolean isReadOnly()

从类复制的说明: Prepared

Check if this command is read only.

覆盖:

isReadOnly 在类中 Prepared

返回:

true if it is

getType

public int getType()

从类复制的说明: Prepared

Get the command type as defined in CommandInterface

指定者:

getType 在类中 Prepared

返回:

the statement type

collectDependencies

public void collectDependencies(HashSet<DbObject> dependencies)

从类复制的说明: Prepared

Find and collect all DbObjects, this Prepared depends on.

覆盖:

collectDependencies 在类中 Prepared

参数:

dependencies - collection of dependencies to populate