Package 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	Description
Select()	Create a new instance of a Select.

Method Summary

Modifier and Type	Method	Description
void	accept(SelectVisitor visitor)	Accept a visitor (e.g.
Select	all()	Add a wildcard field for all involved fields.
Select	arithmeticExpression(BinaryArithmeticExpression arithmeticExpression)	Deprecated. please use a valueExpression(ValueExpression) valueExpression} method instead.
Select	arithmeticExpression(BinaryArithmeticExpression arithmeticExpression, String derivedColumnName)	Deprecated. please use a valueExpression(ValueExpression, String) valueExpression} method instead.
Select	field(String... names)	Add one or more named fields.
FromClause	from()	Get the FromClause of this select statement.
Select	function(Function function)	Add a function.
Select	function(FunctionName functionName, ValueExpression... valueExpressions)	Add a function.
Select	function(FunctionName functionName, String derivedColumnName, ValueExpression... valueExpressions)	Add a function.
Select	function(Function function, String derivedColumnName)	Add a function.
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	udf(String functionName, ColumnsDefinition emitsColumnsDefinition, ValueExpression... valueExpressions)	Add a User Defined Function.
Select	udf(String functionName, ValueExpression... valueExpressions)	Add a User Defined Function.
Select	valueExpression(ValueExpression valueExpression)	Add a value expression.
Select	valueExpression(ValueExpression valueExpression, String derivedColumnName)	Add a value expression expression.
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

function

public Select function(FunctionName functionName,
                       ValueExpression... valueExpressions)

Add a function.

Parameters:

functionName - name of function

valueExpressions - zero or more value expression

Returns:

this instance for fluent programming

function

public Select function(FunctionName functionName,
                       String derivedColumnName,
                       ValueExpression... valueExpressions)

Add a function.

Parameters:

functionName - name of the function

valueExpressions - zero or more value expression

derivedColumnName - name under which you can refer to the derived column

Returns:

this instance for fluent programming

function

public Select function(Function function,
                       String derivedColumnName)

Add a function.

Parameters:

function - function

derivedColumnName - name under which you can refer to the derived column

Returns:

this instance for fluent programming

function

public Select function(Function function)

Add a function.

Parameters:

function - function

Returns:

this instance for fluent programming

udf

public Select udf(String functionName,
                  ColumnsDefinition emitsColumnsDefinition,
                  ValueExpression... valueExpressions)

Add a User Defined Function.

Parameters:

functionName - name of function

emitsColumnsDefinition - column definitions for emits

valueExpressions - zero or more value expressions

Returns:

this instance for fluent programming

udf

public Select udf(String functionName,
                  ValueExpression... valueExpressions)

Add a User Defined Function.

Parameters:

functionName - a name of function

valueExpressions - zero or more value expressions

Returns:

this instance for fluent programming

arithmeticExpression

@Deprecated(since="4.0.2")
public Select arithmeticExpression(BinaryArithmeticExpression arithmeticExpression)

Deprecated.

please use a valueExpression(ValueExpression) valueExpression} method instead.

Add an arithmetic expression.

Parameters:

arithmeticExpression - arithmetic expression

Returns:

this instance for fluent programming

arithmeticExpression

@Deprecated(since="4.0.2")
public Select arithmeticExpression(BinaryArithmeticExpression arithmeticExpression,
                                   String derivedColumnName)

Deprecated.

please use a valueExpression(ValueExpression, String) valueExpression} method instead.

Add an arithmetic expression.

Parameters:

arithmeticExpression - arithmetic expression

derivedColumnName - name under which you can refer to the derived column

Returns:

this instance for fluent programming

valueExpression

public Select valueExpression(ValueExpression valueExpression)

Add a value expression.

Parameters:

valueExpression - value expression

Returns:

this instance for fluent programming

valueExpression

public Select valueExpression(ValueExpression valueExpression,
                              String derivedColumnName)

Add a value expression expression.

Parameters:

valueExpression - value expression

derivedColumnName - name under which you can refer to the derived column

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