Package org.h2.command.dml
Class Explain
java.lang.Object
org.h2.command.Prepared
org.h2.command.dml.Explain
This class represents the statement
EXPLAIN
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Field Summary
FieldsFields inherited from class org.h2.command.Prepared
create, parameters, prepareAlways, session, sqlStatement, sqlTokens
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprivate void
protected void
Check if all parameters have been set.void
collectDependencies
(HashSet<DbObject> dependencies) Find and collect all DbObjects, this Prepared depends on.int
getType()
Get the command type as defined in CommandInterfaceboolean
isQuery()
Check if this object is a query.boolean
Check if this command is read only.boolean
Check if this command is transactional.void
prepare()
Prepare this statement.query
(long maxrows) Execute the query.Get an empty result set containing the meta data.void
setCommand
(Prepared command) void
setExecuteCommand
(boolean executeCommand) 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 Details
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command
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result
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executeCommand
private boolean executeCommand
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Constructor Details
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Explain
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Method Details
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setCommand
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getCommand
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prepare
public void prepare()Description copied from class:Prepared
Prepare this statement. -
setExecuteCommand
public void setExecuteCommand(boolean executeCommand) -
queryMeta
Description copied from class:Prepared
Get an empty result set containing the meta data. -
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
Description copied from class:Prepared
Execute the query. -
add
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isQuery
public boolean isQuery()Description copied from class:Prepared
Check if this object is a query. -
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 -
collectDependencies
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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