com.datastax.driver.core.querybuilder

Class Select.SelectionOrAlias

java.lang.Object

com.datastax.driver.core.querybuilder.Select.Builder

com.datastax.driver.core.querybuilder.Select.Selection

com.datastax.driver.core.querybuilder.Select.SelectionOrAlias

Enclosing class:

Select

public static class Select.SelectionOrAlias
extends Select.Selection

An Selection clause for an in-construction SELECT statement.

This only differs from Select.Selection in that you can add an alias for the previously selected item through as(java.lang.String).

Method Summary

Modifier and Type	Method and Description
Select.Builder	all() Selects all columns (i.e.
Select.Selection	as(String alias) Adds an alias for the just selected item.
Select.SelectionOrAlias	column(String name) Selects the provided column.
Select.Builder	countAll() Selects the count of all returned rows (i.e.
Select.SelectionOrAlias	fcall(String name, Object... parameters) Creates a function call.
Select	from(String keyspace, String table) Adds the table to select from.
Select	from(TableMetadata table) Adds the table to select from.
Select.SelectionOrAlias	raw(String rawString) Selects the provided raw expression.
Select.SelectionOrAlias	ttl(String name) Selects the ttl of provided column.
Select.SelectionOrAlias	writeTime(String name) Selects the write time of provided column.

Methods inherited from class com.datastax.driver.core.querybuilder.Select.Selection

distinct

Methods inherited from class com.datastax.driver.core.querybuilder.Select.Builder

from

Methods inherited from class java.lang.Object

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

Method Detail

as

public Select.Selection as(String alias)

Adds an alias for the just selected item.

Parameters:

alias - the name of the alias to use.

Returns:

this in-build SELECT statement

all

public Select.Builder all()

Selects all columns (i.e. "SELECT * ...")

Specified by:

all in class Select.Selection

Returns:

an in-build SELECT statement.

Throws:

IllegalStateException - if some columns had already been selected for this builder.

countAll

public Select.Builder countAll()

Selects the count of all returned rows (i.e. "SELECT count(*) ...").

Specified by:

countAll in class Select.Selection

Returns:

an in-build SELECT statement.

Throws:

IllegalStateException - if some columns had already been selected for this builder.

column

public Select.SelectionOrAlias column(String name)

Selects the provided column.

Specified by:

column in class Select.Selection

Parameters:

name - the new column name to add.

Returns:

this in-build SELECT statement

raw

public Select.SelectionOrAlias raw(String rawString)

Selects the provided raw expression.

This method is used internally by the mapper module. It is not exposed on the parent class Select.Selection to avoid breaking binary compatibility. This means that it is not accessible directly via the fluent API (you need a cast). This shouldn't be a problem for regular clients because they will use other methods of the DSL (fcall, etc.) rather than provide a raw string.

Parameters:

rawString - the raw expression to add.

Returns:

this in-build SELECT statement

writeTime

public Select.SelectionOrAlias writeTime(String name)

Selects the write time of provided column.

This is a shortcut for fcall("writetime", QueryBuilder.column(name)).

Specified by:

writeTime in class Select.Selection

Parameters:

name - the name of the column to select the write time of.

Returns:

this in-build SELECT statement

ttl

public Select.SelectionOrAlias ttl(String name)

Selects the ttl of provided column.

This is a shortcut for fcall("ttl", QueryBuilder.column(name)).

Specified by:

ttl in class Select.Selection

Parameters:

name - the name of the column to select the ttl of.

Returns:

this in-build SELECT statement

fcall

public Select.SelectionOrAlias fcall(String name,
                                     Object... parameters)

Creates a function call.

Please note that the parameters are interpreted as values, and so fcall("textToBlob", "foo") will generate the string "textToBlob('foo')". If you want to generate "textToBlob(foo)", i.e. if the argument must be interpreted as a column name (in a select clause), you will need to use the QueryBuilder.column(java.lang.String) method, and so fcall("textToBlob", QueryBuilder.column(foo).

Specified by:

fcall in class Select.Selection

Parameters:

name - the name of the function.

parameters - the parameters for the function call.

Returns:

this in-build SELECT statement

from

public Select from(String keyspace,
                   String table)

Adds the table to select from.

Overrides:

from in class Select.Builder

Parameters:

keyspace - the name of the keyspace to select from.

table - the name of the table to select from.

Returns:

a newly built SELECT statement that selects from keyspace.table.

from

public Select from(TableMetadata table)

Adds the table to select from.

Overrides:

from in class Select.Builder

Parameters:

table - the table to select from.

Returns:

a newly built SELECT statement that selects from table.