Package net.sf.basedb.core.query

Class HqlExpression

java.lang.Object
net.sf.basedb.core.query.HqlExpression
All Implemented Interfaces:
Expression, QueryElement, Restriction
public class HqlExpression extends Object implements Expression, Restriction
A class holding an expression or a restriction where a prefix can be used to represent a root alias in a HQL. I.e. $name = 'somename' could be used for all items that have a name property. '$' will be replaced with the right root alias when the restriction is used in a query, $name = 'somename' will be usr.name = 'somename' in a query for the user table.
Version:
2.5
Author:
Martin

  • Field Details

    • expression

      private final String expression
      The restriction or expression as a string.

    • prefix

      private final String prefix
      Prefix used to indentify where to put the root alias.

  • Constructor Details

    • HqlExpression

      HqlExpression(String expression, String prefix)

  • Method Details

    • 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

    • 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

    • toString

      public String toString()
      Returns the expression field.
      Overrides:
      toString in class Object

    • equals

      public boolean equals(Object other)
      This expression is equal to another HqlExpression if their child expressions are equal.
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object