Package net.sf.basedb.core.query

Class SubqueryExpression

java.lang.Object
net.sf.basedb.core.query.SubqueryExpression
All Implemented Interfaces:
Expression, QueryElement
public class SubqueryExpression extends Object implements Expression
Expression that returns the result of a query as it's value. This expression is used with subqueries.
Version:
2.9
Author:
Nicklas
See Also:
Last modified
$Date: 2010-04-21 11:48:29 +0200 (on, 21 apr 2010) $

  • Field Details

    • operator

      private final String operator

    • subquery

      private final Query subquery

  • Constructor Details

    • SubqueryExpression

      SubqueryExpression(String operator, Query subquery)

  • Method Details

    • toQl

      public String toQl(Query query, DbControl dc) throws BaseException
      Description copied from interface: QueryElement
      Create a query language string of the query element. Use the Query.getQueryType() method to find out which query language is wanted in case the element requires different syntax for different languages.
      Specified by:
      toQl in interface QueryElement
      Parameters:
      query - The query that is about to be executed
      dc - The DbControl object used to execute the query
      Throws:
      BaseException - If there is any other error

    • getChildren

      public Collection<? extends QueryElement> getChildren()
      Description copied from interface: QueryElement
      Get the children of this query element or null if it has no children. For example the AddExpression has two children, the expression beeing added.
      Specified by:
      getChildren in interface QueryElement
      Returns:
      Always null

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • equals

      public boolean equals(Object other)
      This expression is equal to another SubqueryExpression if they use the same operator and reference the same subquery instance.
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object