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QueryNode (Hibernate API Documentation) - Hibernate 3.2.3 正式版 API 英文文档

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org.hibernate.hql.ast.tree
Class QueryNode

java.lang.Object
  antlr.BaseAST
      antlr.CommonAST
          org.hibernate.hql.ast.tree.Node
              org.hibernate.hql.ast.tree.SqlNode
                  org.hibernate.hql.ast.tree.HqlSqlWalkerNode
                      org.hibernate.hql.ast.tree.AbstractStatement
                          org.hibernate.hql.ast.tree.AbstractRestrictableStatement
                              org.hibernate.hql.ast.tree.QueryNode

All Implemented Interfaces:

antlr.collections.AST, DisplayableNode, InitializeableNode, RestrictableStatement, SelectExpression, Serializable, Statement

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public class QueryNode

extends AbstractRestrictableStatement

implements SelectExpression

Defines a top-level AST node representing an HQL select statement.

Author:

Joshua Davis

See Also:

Serialized Form

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Field Summary

 

Fields inherited from class antlr.BaseAST

down, right

 

Constructor Summary

QueryNode()

 

Method Summary
String	getAlias()
Type	getDataType()           Returns the data type of the select expression.
FromElement	getFromElement()           Returns the FROM element that this expression refers to.
protected  org.apache.commons.logging.Log	getLog()
OrderByClause	getOrderByClause()
SelectClause	getSelectClause()           Locate the select clause that is part of this select statement.
int	getStatementType()           Return the main token type representing the type of this statement.
protected  int	getWhereClauseParentTokenType()
boolean	hasOrderByClause()
boolean	isConstructor()           Returns true if the element is a constructor (e.g.
boolean	isReturnableEntity()           Returns true if this select expression represents an entity that can be returned.
boolean	isScalar()
boolean	needsExecutor()           Does this statement require the StatementExecutor?
void	setAlias(String alias)
void	setScalarColumnText(int i)           Appends AST nodes that represent the columns after the current AST node.

 

Methods inherited from class org.hibernate.hql.ast.tree.AbstractRestrictableStatement

getFromClause, getWhereClause, hasWhereClause, locateWhereClause

 

Methods inherited from class org.hibernate.hql.ast.tree.AbstractStatement

getDisplayText

 

Methods inherited from class org.hibernate.hql.ast.tree.HqlSqlWalkerNode

getAliasGenerator, getASTFactory, getSessionFactoryHelper, getWalker, initialize

 

Methods inherited from class org.hibernate.hql.ast.tree.SqlNode

getOriginalText, setDataType, setText

 

Methods inherited from class org.hibernate.hql.ast.tree.Node

getColumn, getFilename, getLine, getRenderText, getTextLength, initialize, initialize

 

Methods inherited from class antlr.CommonAST

getText, getType, initialize, setType

 

Methods inherited from class antlr.BaseAST

addChild, decode, encode, equals, equalsList, equalsListPartial, equalsTree, equalsTreePartial, findAll, findAllPartial, getFirstChild, getNextSibling, getNumberOfChildren, getTokenNames, removeChildren, setFirstChild, setNextSibling, setVerboseStringConversion, toString, toStringList, toStringTree, xmlSerialize, xmlSerializeNode, xmlSerializeRootClose, xmlSerializeRootOpen

 

Methods inherited from class java.lang.Object

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

 

Methods inherited from interface org.hibernate.hql.ast.tree.SelectExpression

setText

 

Methods inherited from interface org.hibernate.hql.ast.tree.Statement

getWalker

 

Constructor Detail

QueryNode

public QueryNode()

Method Detail

getStatementType

public int getStatementType()

Description copied from interface: Statement

Return the main token type representing the type of this statement.

Specified by:

getStatementType in interface Statement

Returns:

The corresponding token type.

See Also:

Statement.getStatementType()

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needsExecutor

public boolean needsExecutor()

Description copied from interface: Statement

Does this statement require the StatementExecutor?

Essentially, at the JDBC level, does this require an executeUpdate()?

Specified by:

needsExecutor in interface Statement

Returns:

True if this statement should be handed off to the StatementExecutor to be executed; false otherwise.

See Also:

Statement.needsExecutor()

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getWhereClauseParentTokenType

protected int getWhereClauseParentTokenType()

Specified by:

getWhereClauseParentTokenType in class AbstractRestrictableStatement

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getLog

protected org.apache.commons.logging.Log getLog()

Specified by:

getLog in class AbstractRestrictableStatement

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getSelectClause

public final SelectClause getSelectClause()

Locate the select clause that is part of this select statement.

Note, that this might return null as derived select clauses (i.e., no select clause at the HQL-level) get generated much later than when we get created; thus it depends upon lifecycle.

Returns:

Our select clause, or null.

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hasOrderByClause

public final boolean hasOrderByClause()

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getOrderByClause

public final OrderByClause getOrderByClause()

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getAlias

public String getAlias()

Specified by:

getAlias in interface SelectExpression

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getFromElement

public FromElement getFromElement()

Description copied from interface: SelectExpression

Returns the FROM element that this expression refers to.

Specified by:

getFromElement in interface SelectExpression

Returns:

The FROM element.

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isConstructor

public boolean isConstructor()

Description copied from interface: SelectExpression

Returns true if the element is a constructor (e.g. new Foo).

Specified by:

isConstructor in interface SelectExpression

Returns:

true if the element is a constructor (e.g. new Foo).

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isReturnableEntity

public boolean isReturnableEntity()
                           throws antlr.SemanticException

Description copied from interface: SelectExpression

Returns true if this select expression represents an entity that can be returned.

Specified by:

isReturnableEntity in interface SelectExpression

Returns:

true if this select expression represents an entity that can be returned.

Throws:

antlr.SemanticException

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isScalar

public boolean isScalar()
                 throws antlr.SemanticException

Specified by:

isScalar in interface SelectExpression

Throws:

antlr.SemanticException

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setAlias

public void setAlias(String alias)

Specified by:

setAlias in interface SelectExpression

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setScalarColumnText

public void setScalarColumnText(int i)
                         throws antlr.SemanticException

Description copied from interface: SelectExpression

Appends AST nodes that represent the columns after the current AST node. (e.g. 'as col0_O_')

Specified by:

setScalarColumnText in interface SelectExpression

Parameters:

i - The index of the select expression in the projection list.

Throws:

antlr.SemanticException

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getDataType

public Type getDataType()

Description copied from interface: SelectExpression

Returns the data type of the select expression.

Specified by:

getDataType in interface SelectExpression

Overrides:

getDataType in class SqlNode

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