Package org.h2.command.dml
Class Explain
- java.lang.Object
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- org.h2.command.Prepared
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- org.h2.command.dml.Explain
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public class Explain extends Prepared
This class represents the statement EXPLAIN
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Field Summary
Fields Modifier and Type Field Description private Prepared
command
private boolean
executeCommand
private LocalResult
result
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Fields inherited from class org.h2.command.Prepared
create, parameters, prepareAlways, session, sqlStatement, sqlTokens
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Constructor Summary
Constructors Constructor Description Explain(SessionLocal session)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description private void
add(java.lang.String text)
protected void
checkParameters()
Check if all parameters have been set.void
collectDependencies(java.util.HashSet<DbObject> dependencies)
Find and collect all DbObjects, this Prepared depends on.Prepared
getCommand()
int
getType()
Get the command type as defined in CommandInterfaceboolean
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)
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Methods inherited from class org.h2.command.Prepared
checkCanceled, getCteCleanups, getCurrentRowNumber, getObjectId, getParameters, getPersistedObjectId, getPlanSQL, getSession, getSimpleSQL, getSQL, getSQLTokens, isCacheable, needRecompile, setCommand, setCteCleanups, setCurrentRowNumber, setParameterList, setPersistedObjectId, setPrepareAlways, setRow, setSession, setSQL, toString, update
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Field Detail
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command
private Prepared command
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result
private LocalResult result
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executeCommand
private boolean executeCommand
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Constructor Detail
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Explain
public Explain(SessionLocal session)
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Method Detail
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setCommand
public void setCommand(Prepared command)
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getCommand
public Prepared getCommand()
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prepare
public void prepare()
Description copied from class:Prepared
Prepare this statement.
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setExecuteCommand
public void setExecuteCommand(boolean executeCommand)
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queryMeta
public ResultInterface queryMeta()
Description copied from class:Prepared
Get an empty result set containing the meta data.
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checkParameters
protected void checkParameters()
Description copied from class:Prepared
Check if all parameters have been set.- Overrides:
checkParameters
in classPrepared
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query
public ResultInterface query(long maxrows)
Description copied from class:Prepared
Execute the query.
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add
private void add(java.lang.String text)
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isQuery
public boolean isQuery()
Description copied from class:Prepared
Check if this object is a query.
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isTransactional
public boolean isTransactional()
Description copied from class:Prepared
Check if this command is transactional. If it is not, then it forces the current transaction to commit.- Specified by:
isTransactional
in classPrepared
- Returns:
- true if it is
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isReadOnly
public boolean isReadOnly()
Description copied from class:Prepared
Check if this command is read only.- Overrides:
isReadOnly
in classPrepared
- Returns:
- true if it is
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getType
public int getType()
Description copied from class:Prepared
Get the command type as defined in CommandInterface
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collectDependencies
public void collectDependencies(java.util.HashSet<DbObject> dependencies)
Description copied from class:Prepared
Find and collect all DbObjects, this Prepared depends on.- Overrides:
collectDependencies
in classPrepared
- Parameters:
dependencies
- collection of dependencies to populate
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