org.apache.cassandra.cql

## Class SelectExpression

- java.lang.Object
- - org.apache.cassandra.cql.SelectExpression

-     public class SelectExpression
      extends java.lang.Object

  Select expressions are analogous to the projection in a SQL query. They determine which columns will appear in the result set. SelectExpression instances encapsulate a parsed expression from a `SELECT` statement. See: doc/cql/CQL.html#SpecifyingColumns

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `MAX_COLUMNS_DEFAULT`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `SelectExpression(Term first, int count, boolean reverse, boolean firstSet)` Create a new SelectExpression for a list of columns.
    `SelectExpression(Term start, Term finish, int count, boolean reverse, boolean wildcard, boolean firstSet)` Create a new SelectExpression for a range (slice) of columns.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `and(Term addTerm)` Add an additional column name to a SelectExpression.
    `java.util.List<Term>` | `getColumns()`
    `int` | `getColumnsLimit()`
    `Term` | `getFinish()`
    `Term` | `getStart()`
    `boolean` | `hasFirstSet()`
    `boolean` | `isColumnList()`
    `boolean` | `isColumnRange()`
    `boolean` | `isColumnsReversed()`
    `boolean` | `isWildcard()`
    `void` | `setColumnsLimit(int limit)`
    `void` | `setColumnsReversed(boolean reversed)`
    `java.lang.String` | `toString()`

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### MAX_COLUMNS_DEFAULT

          public static final int MAX_COLUMNS_DEFAULT

      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### SelectExpression

          public SelectExpression(Term start,
                          Term finish,
                          int count,
                          boolean reverse,
                          boolean wildcard,
                          boolean firstSet)

      Create a new SelectExpression for a range (slice) of columns.
      Parameters:
        `start` - the starting column name
        `finish` - the finishing column name
        `count` - the number of columns to limit the results to
        `reverse` - true to reverse column order
        `wildcard` - determines weather this statement is wildcard
        `firstSet` - determines weather "FIRST" keyword was set

    - #### SelectExpression

          public SelectExpression(Term first,
                          int count,
                          boolean reverse,
                          boolean firstSet)

      Create a new SelectExpression for a list of columns.
      Parameters:
        `first` - the first (possibly only) column name to select on.
        `count` - the number of columns to limit the results on
        `reverse` - true to reverse column order
        `firstSet` - determines weather "FIRST" keyword was set

  - ### Method Detail

    - #### and

          public void and(Term addTerm)

      Add an additional column name to a SelectExpression.
      Parameters:
        `addTerm` -

    - #### isColumnRange

          public boolean isColumnRange()

    - #### isColumnList

          public boolean isColumnList()

    - #### getColumnsLimit

          public int getColumnsLimit()

    - #### isColumnsReversed

          public boolean isColumnsReversed()

    - #### setColumnsReversed

          public void setColumnsReversed(boolean reversed)

    - #### setColumnsLimit

          public void setColumnsLimit(int limit)

    - #### hasFirstSet

          public boolean hasFirstSet()

      Returns:
        weather expression includes "FIRST" keyword

    - #### getStart

          public Term getStart()

    - #### getFinish

          public Term getFinish()

    - #### getColumns

          public java.util.List<Term> getColumns()

    - #### isWildcard

          public boolean isWildcard()

    - #### toString

          public java.lang.String toString()

      Overrides:
        `toString` in class `java.lang.Object`

Copyright © 2014 The Apache Software Foundation