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
Constructor Summary |
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. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
MAX_COLUMNS_DEFAULT
public static final int MAX_COLUMNS_DEFAULT
- See Also:
- Constant Field Values
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 namefinish
- the finishing column namecount
- the number of columns to limit the results toreverse
- true to reverse column orderwildcard
- determines weather this statement is wildcardfirstSet
- 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 onreverse
- true to reverse column orderfirstSet
- determines weather "FIRST" keyword was set
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 © 2012 The Apache Software Foundation