Package nz.co.gregs.dbvolution.expressions.windows

Class WindowFunctionFramable.CurrentRowEnd<A extends EqualExpression<?,?,?>>

    • Method Detail

      • toSQLString

        public String toSQLString​(DBDefinition defn)
        Description copied from interface: HasSQLString
        Produces the snippet provided by this class.

        This is only used internally.

        If you are extending DBvolution and adding a new function this is the place to format the information for use in SQL. A DBDefinition instance is provided to supply context and so your SQL can used on multiple database engines.

        Parameters:
        defn - the target database

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        Returns:
        the DBValue formatted as a SQL snippet

      • copy

        public WindowFunctionFramable.CurrentRowEnd<A> copy()
        Description copied from interface: DBExpression
        A Complete Copy Of This DBValue.

        Immutability in DBvolution is maintain by internally copying objects.

        This method enables immutability by performing a deep copy of the object.

        Singletons may return themselves but all other objects must return a new instance with copies of all mutable fields.

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        Returns:
        a copy of this DBValue

      • isPurelyFunctional

        public boolean isPurelyFunctional()
        Description copied from interface: DBExpression
        Indicates whether or not the expression includes table columns.

        Purely functional expressions use only in-built functions or literal values to produce results and do not require data from tables.

        Some databases, notably MS SQLServer, can not group purely functional expressions.

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        Returns:
        TRUE if the expression does not access table data, otherwise FALSE.