java.lang.Object
- org.eclipse.persistence.jpa.jpql.parser.AbstractExpression
- - org.eclipse.persistence.jpa.jpql.parser.AbstractSelectStatement

All Implemented Interfaces:

Expression

Direct Known Subclasses:

SelectStatement, SimpleSelectStatement
```
public abstract class AbstractSelectStatement
extends AbstractExpression
```
A query is an operation that retrieves data from one or more tables or views. In this reference, a top-level SELECT statement is called a query, and a query nested within another SQL statement is called a subquery.

Since:

2.3

Version:

2.5

Author:

Pascal Filion

See Also:

SelectStatement, SimpleSelectStatement

Field Summary
- Fields inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractExpression
  COMMA, DOT, DOUBLE_QUOTE, LEFT_CURLY_BRACKET, LEFT_PARENTHESIS, NOT_DEFINED, RIGHT_CURLY_BRACKET, RIGHT_PARENTHESIS, SINGLE_QUOTE, SPACE, UNDERSCORE
- Fields inherited from interface org.eclipse.persistence.jpa.jpql.parser.Expression
  ABS, ALL, AND, ANY, AS, AS_OF, ASC, AVG, BETWEEN, BIT_LENGTH, BOTH, CASE, CAST, CHAR_LENGTH, CHARACTER_LENGTH, CLASS, COALESCE, COLUMN, CONCAT, CONNECT_BY, COUNT, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, DELETE, DELETE_FROM, DESC, DIFFERENT, DISTINCT, DIVISION, ELSE, EMPTY, END, ENTRY, EQUAL, ESCAPE, EXCEPT, EXISTS, EXTRACT, FALSE, FETCH, FIRST, FROM, FUNC, FUNCTION, GREATER_THAN, GREATER_THAN_OR_EQUAL, GROUP_BY, HAVING, IN, INDEX, INNER, INNER_JOIN, INNER_JOIN_FETCH, INTERSECT, IS, IS_EMPTY, IS_NOT_EMPTY, IS_NOT_NULL, IS_NULL, JOIN, JOIN_FETCH, KEY, LAST, LEADING, LEFT, LEFT_JOIN, LEFT_JOIN_FETCH, LEFT_OUTER_JOIN, LEFT_OUTER_JOIN_FETCH, LENGTH, LIKE, LOCATE, LOWER, LOWER_THAN, LOWER_THAN_OR_EQUAL, MAX, MEMBER, MEMBER_OF, MIN, MINUS, MOD, MULTIPLICATION, NAMED_PARAMETER, NEW, NOT, NOT_BETWEEN, NOT_EQUAL, NOT_EXISTS, NOT_IN, NOT_LIKE, NOT_MEMBER, NOT_MEMBER_OF, NULL, NULLIF, NULLS, NULLS_FIRST, NULLS_LAST, OBJECT, OF, ON, OPERATOR, OR, ORDER_BY, ORDER_SIBLINGS_BY, OUTER, PLUS, POSITION, POSITIONAL_PARAMETER, QUOTE, REGEXP, SCN, SELECT, SET, SIZE, SOME, SQL, SQRT, START_WITH, SUBSTRING, SUM, TABLE, THEN, TIMESTAMP, TRAILING, TREAT, TRIM, TRUE, TYPE, UNION, UNKNOWN, UPDATE, UPPER, VALUE, WHEN, WHERE

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`acceptChildren(ExpressionVisitor visitor)`	Visits the children of this `Expression`.
`JPQLQueryBNF`	`findQueryBNF(Expression expression)`	Retrieves the `JPQLQueryBNF` that represents the fragment of this `Expression` that was used when parsing the given `Expression`.
`Expression`	`getFromClause()`	Returns the `Expression` representing the FROM clause.
`Expression`	`getGroupByClause()`	Returns the `Expression` representing the GROUP BY clause.
`Expression`	`getHavingClause()`	Returns the `Expression` representing the HAVING clause.
`Expression`	`getSelectClause()`	Returns the `AbstractSelectClause` representing the SELECT clause.
`Expression`	`getWhereClause()`	Returns the `Expression` representing the WHERE clause.
`boolean`	`hasFromClause()`	Determines whether the FROM clause was parsed or not.
`boolean`	`hasGroupByClause()`	Determines whether the GROUP BY clause was parsed or not.
`boolean`	`hasHavingClause()`	Determines whether the HAVING clause was parsed or not.
`boolean`	`hasSelectClause()`	Determines whether the SELECT clause was parsed or not.
`boolean`	`hasSpaceAfterFrom()`	Determines whether a whitespace was found after the FROM clause.
`boolean`	`hasSpaceAfterGroupBy()`	Determines whether a whitespace was found after the GROUP BY clause.
`boolean`	`hasSpaceAfterSelect()`	Determines whether a whitespace was found after the SELECT clause.
`boolean`	`hasSpaceAfterWhere()`	Determines whether a whitespace was found after the WHERE clause.
`boolean`	`hasWhereClause()`	Determines whether the WHERE clause is defined.

Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractExpression
children, getGrammar, getIdentifierVersion, getLength, getOffset, getParent, getQueryBNF, getRoot, isAncestor, orderedChildren, populatePosition, toActualText, toParsedText, toString

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.eclipse.persistence.jpa.jpql.parser.Expression
accept, getQueryBNF

- Method Detail
  - acceptChildren
```
public void acceptChildren(ExpressionVisitor visitor)
```
    Visits the children of this Expression. This method can be used to optimize traversing the children since a new list is not created every time Expression.children() is called.
    This does not traverse the Expression sub-hierarchy, use a subclass of AbstractTraverseChildrenVisitor in order to traverse the entire sub-hierarchy.
    
    Parameters:
    
    visitor - The visitor to visit the children of this object.
  - findQueryBNF
```
public JPQLQueryBNF findQueryBNF(Expression expression)
```
    Retrieves the JPQLQueryBNF that represents the fragment of this Expression that was used when parsing the given Expression.
    
    Specified by:
    
    findQueryBNF in interface Expression
    
    Overrides:
    
    findQueryBNF in class AbstractExpression
    
    Parameters:
    
    expression - The Expression that is a descendant of this one
    
    Returns:
    
    The JPQLQueryBNF that was used to parse the given expression
  - getFromClause
```
public final Expression getFromClause()
```
    Returns the Expression representing the FROM clause.
    
    Returns:
    
    The expression representing the FROM clause
  - getGroupByClause
```
public final Expression getGroupByClause()
```
    Returns the Expression representing the GROUP BY clause.
    
    Returns:
    
    The expression representing the GROUP BY clause
  - getHavingClause
```
public final Expression getHavingClause()
```
    Returns the Expression representing the HAVING clause.
    
    Returns:
    
    The expression representing the HAVING clause
  - getSelectClause
```
public final Expression getSelectClause()
```
    Returns the AbstractSelectClause representing the SELECT clause.
    
    Returns:
    
    The expression representing the SELECT clause
  - getWhereClause
```
public final Expression getWhereClause()
```
    Returns the Expression representing the WHERE clause.
    
    Returns:
    
    The expression representing the WHERE clause
  - hasFromClause
```
public final boolean hasFromClause()
```
    Determines whether the FROM clause was parsed or not.
    
    Returns:
    
    true if the query that got parsed had the FROM clause
  - hasGroupByClause
```
public final boolean hasGroupByClause()
```
    Determines whether the GROUP BY clause was parsed or not.
    
    Returns:
    
    true if the query that got parsed had the GROUP BY clause
  - hasHavingClause
```
public final boolean hasHavingClause()
```
    Determines whether the HAVING clause was parsed or not.
    
    Returns:
    
    true if the query that got parsed had the HAVING clause
  - hasSelectClause
```
public final boolean hasSelectClause()
```
    Determines whether the SELECT clause was parsed or not.
    
    Returns:
    
    true if the query that got parsed had the HAVING clause
    
    Since:
    
    2.5
  - hasSpaceAfterFrom
```
public final boolean hasSpaceAfterFrom()
```
    Determines whether a whitespace was found after the FROM clause. In some cases, the space is owned by a child of the FROM clause.
    
    Returns:
    
    true if there was a whitespace after the FROM clause and owned by this expression; false otherwise
  - hasSpaceAfterGroupBy
```
public final boolean hasSpaceAfterGroupBy()
```
    Determines whether a whitespace was found after the GROUP BY clause. In some cases, the space is owned by a child of the GROUP BY clause.
    
    Returns:
    
    true if there was a whitespace after the GROUP BY clause and owned by this expression; false otherwise
  - hasSpaceAfterSelect
```
public final boolean hasSpaceAfterSelect()
```
    Determines whether a whitespace was found after the SELECT clause. In some cases, the space is owned by a child of the SELECT clause.
    
    Returns:
    
    true if there was a whitespace after the SELECT clause and owned by this expression; false otherwise
  - hasSpaceAfterWhere
```
public final boolean hasSpaceAfterWhere()
```
    Determines whether a whitespace was found after the WHERE clause. In some cases, the space is owned by a child of the WHERE clause.
    
    Returns:
    
    true if there was a whitespace after the WHERE clause and owned by this expression; false otherwise
  - hasWhereClause
```
public final boolean hasWhereClause()
```
    Determines whether the WHERE clause is defined.
    
    Returns:
    
    true if the query that got parsed had the WHERE clause

Class AbstractSelectStatement

Field Summary

Fields inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractExpression

Fields inherited from interface org.eclipse.persistence.jpa.jpql.parser.Expression

Method Summary

Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractExpression

Methods inherited from class java.lang.Object

Methods inherited from interface org.eclipse.persistence.jpa.jpql.parser.Expression

Method Detail

acceptChildren

findQueryBNF

getFromClause

getGroupByClause

getHavingClause

getSelectClause

getWhereClause

hasFromClause

hasGroupByClause

hasHavingClause

hasSelectClause

hasSpaceAfterFrom

hasSpaceAfterGroupBy

hasSpaceAfterSelect

hasSpaceAfterWhere

hasWhereClause