Package com.ibm.fhir.database.utils.query

Class Select

java.lang.Object

com.ibm.fhir.database.utils.query.Select

public class Select
extends Object

Representation of a select statement built by SelectAdapter.build()

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Select()	Default constructor.
protected	Select(boolean distinct)	Protected constructor

Method Summary

Modifier and Type	Method	Description
void	addColumn(String source, String name)	Add a single column to the select list
void	addColumn(String source, String name, Alias alias)	Add a single column to the select list, providing an alias for the column
void	addColumns(String... columns)	Add the list of simple columns
void	addFrom(Select sub, Alias alias)	Add a sub-select statement with an alias to the from-clause
void	addHavingPredicate(String predicate)	Add a predicate to the HAVING clause for this statement
void	addInnerJoin(String tableName, Alias alias, ExpNode joinOnPredicate)	Add an inner join to the from clause for this select statement.
void	addLeftOuterJoin(String tableName, Alias alias, ExpNode joinOnPredicate)	Add a left outer join to the from clause for this select statement.
void	addPagination(int offset, int rowsPerPage)	Add a pagination clause (offset/limit) to the query.
void	addTable(String tableName)	Add a table item to the from-clause
void	addTable(String tableName, Alias alias)	Add a table item with an alias to the from-clause
void	addTable(String schemaName, String tableName)	Add a table item to the from-clause
void	addTable(String schemaName, String tableName, Alias alias)	Add a schema-qualified table item with an alias to the from clause
OrderByClause	getOrderByClause()
WhereClause	getWhereClause()	Getter for the whereClause
<T> T	render(StatementRenderer<T> renderer)	Render the components of the statement
static SelectAdapter	select(boolean distinct, String... columns)	Factory to start building a SELECT DISTINCT statement
static SelectAdapter	select(String... columns)	Factory to create a new instance of the builder needed to create this statement
void	setGroupByClause(GroupByClause gb)	Set the group-by-clause for this statement
void	setOrderByClause(OrderByClause ob)
void	setWhereClause(WhereClause wc)	Set the where-clause for this statement
String	toDebugString()	A string representation of the query with the bind variables substituted in place which is handy for debugging - but not to be used for actual execution.
String	toString()
<T> T	visit(ExpNodeVisitor<T> visitor)	Visit the components of this query

Methods inherited from class java.lang.Object

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

Constructor Detail

Select

protected Select()

Default constructor. Not a DISTINCT select.

Select

protected Select(boolean distinct)

Protected constructor

Parameters:

distinct - if true, query will be SELECT DISTINCT ...

Method Detail

select

public static SelectAdapter select(String... columns)

Factory to create a new instance of the builder needed to create this statement

Parameters:

columns -

Returns:

select

public static SelectAdapter select(boolean distinct,
                                   String... columns)

Factory to start building a SELECT DISTINCT statement

Parameters:

distinct -

columns -

Returns:

addColumns

public void addColumns(String... columns)

Add the list of simple columns

Parameters:

columns -

addColumn

public void addColumn(String source,
                      String name)

Add a single column to the select list

Parameters:

source -

name -

addColumn

public void addColumn(String source,
                      String name,
                      Alias alias)

Add a single column to the select list, providing an alias for the column

Parameters:

source -

name -

alias -

addTable

public void addTable(String schemaName,
                     String tableName)

Add a table item to the from-clause

Parameters:

schemaName -

tableName -

addTable

public void addTable(String tableName,
                     Alias alias)

Add a table item with an alias to the from-clause

Parameters:

tableName -

alias -

addTable

public void addTable(String tableName)

Add a table item to the from-clause

Parameters:

tableName -

addTable

public void addTable(String schemaName,
                     String tableName,
                     Alias alias)

Add a schema-qualified table item with an alias to the from clause

Parameters:

schemaName -

tableName -

alias -

addFrom

public void addFrom(Select sub,
                    Alias alias)

Add a sub-select statement with an alias to the from-clause

Parameters:

sub -

alias -

setWhereClause

public void setWhereClause(WhereClause wc)

Set the where-clause for this statement

Parameters:

wc -

setGroupByClause

public void setGroupByClause(GroupByClause gb)

Set the group-by-clause for this statement

Parameters:

gb -

addHavingPredicate

public void addHavingPredicate(String predicate)

Add a predicate to the HAVING clause for this statement

Parameters:

predicate -

toString

public String toString()

Overrides:

toString in class Object

toDebugString

public String toDebugString()

A string representation of the query with the bind variables substituted in place which is handy for debugging - but not to be used for actual execution.

Returns:

the query string

render

public <T> T render(StatementRenderer<T> renderer)

Render the components of the statement

Type Parameters:

T -

Parameters:

renderer -

Returns:

addInnerJoin

public void addInnerJoin(String tableName,
                         Alias alias,
                         ExpNode joinOnPredicate)

Add an inner join to the from clause for this select statement.

Parameters:

tableName -

alias -

joinOnPredicate -

addLeftOuterJoin

public void addLeftOuterJoin(String tableName,
                             Alias alias,
                             ExpNode joinOnPredicate)

Add a left outer join to the from clause for this select statement.

Parameters:

tableName -

alias -

joinOnPredicate -

setOrderByClause

public void setOrderByClause(OrderByClause ob)

Parameters:

ob -

getWhereClause

public WhereClause getWhereClause()

Getter for the whereClause

Returns:

the whereClause value, which can be null if not yet set

visit

public <T> T visit(ExpNodeVisitor<T> visitor)

Visit the components of this query

Type Parameters:

T -

Parameters:

visitor -

Returns:

addPagination

public void addPagination(int offset,
                          int rowsPerPage)

Add a pagination clause (offset/limit) to the query.

Parameters:

offset -

rowsPerPage -

getOrderByClause

public OrderByClause getOrderByClause()

Returns:

the ORDER BY clause object for this select statement. Can be null.