com.exasol.sql.dql.select

Class Select

java.lang.Object

com.exasol.sql.AbstractFragment

com.exasol.sql.dql.select.Select

All Implemented Interfaces:

SelectFragment, Fragment, SqlStatement

public class Select
extends AbstractFragment
implements SqlStatement, SelectFragment

This class implements an SQL Select statement.

Field Summary

Fields inherited from class com.exasol.sql.AbstractFragment

root

Constructor Summary

Constructors

Constructor and Description
Select() Create a new instance of a Select.

Method Summary

Modifier and Type	Method and Description
void	accept(SelectVisitor visitor) Accept a visitor (e.g.
Select	all() Add a wildcard field for all involved fields.
Select	field(String... names) Add one or more named fields.
FromClause	from() Get the FromClause of this select statement.
GroupByClause	groupBy(ColumnReference... columnReferences) Create a new GroupByClause.
Select	limit(int count) Create a new full outer LimitClause.
Select	limit(int offset, int count) Create a new full outer LimitClause.
OrderByClause	orderBy(ColumnReference... columnReferences) Create a new OrderByClause.
Select	where(BooleanExpression expression) Create a new WhereClause.

Methods inherited from class com.exasol.sql.AbstractFragment

getRoot

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.exasol.sql.Fragment

getRoot

Constructor Detail

Select

public Select()

Create a new instance of a Select.

Method Detail

all

public Select all()

Add a wildcard field for all involved fields.

Returns:

this instance for fluent programming

field

public Select field(String... names)

Add one or more named fields.

Parameters:

names - field name

Returns:

this instance for fluent programming

from

public FromClause from()

Get the FromClause of this select statement.

Returns:

from clause

limit

public Select limit(int count)

Create a new full outer LimitClause.

Parameters:

count - maximum number of rows to be included in query result

Returns:

this for fluent programming

Throws:

IllegalStateException - if a limit clause already exists

limit

public Select limit(int offset,
                    int count)

Create a new full outer LimitClause.

Parameters:

offset - index of the first row in the query result

count - maximum number of rows to be included in query result

Returns:

this for fluent programming

Throws:

IllegalStateException - if a limit clause already exists

where

public Select where(BooleanExpression expression)

Create a new WhereClause.

Parameters:

expression - boolean expression that defines the filter criteria

Returns:

this for fluent programming

groupBy

public GroupByClause groupBy(ColumnReference... columnReferences)

Create a new GroupByClause.

Parameters:

columnReferences - column references

Returns:

GroupByClause instance

orderBy

public OrderByClause orderBy(ColumnReference... columnReferences)

Create a new OrderByClause.

Parameters:

columnReferences - column references

Returns:

OrderByClause instance

accept

public void accept(SelectVisitor visitor)

Description copied from interface: SelectFragment

Accept a visitor (e.g. a renderer or validator)

Specified by:

accept in interface SelectFragment

Parameters:

visitor - visitor to accept