Package org.pgcodekeeper.core.loader

Class QueryBuilder

java.lang.Object

org.pgcodekeeper.core.loader.QueryBuilder

public final class QueryBuilder
extends Object

SQL query builder for constructing SELECT statements with support for CTEs, joins, WHERE clauses, and GROUP BY. Provides a fluent interface for building complex SQL queries programmatically.

Constructor Summary

Constructors

Constructor	Description
QueryBuilder()

Method Summary

Modifier and Type	Method	Description
String	build()	Builds and returns the complete SQL query string.
QueryBuilder	column(String column)	Adds a column to the SELECT clause.
QueryBuilder	column(String prefix, QueryBuilder column, String postfix)	Adds a column with prefix and postfix using a subquery.
QueryBuilder	copy()	Creates a deep copy of this query builder.
QueryBuilder	from(String from)	Sets the FROM clause of the query.
QueryBuilder	from(QueryBuilder from, String postfix)	Sets the FROM clause using a subquery with postfix.
QueryBuilder	groupBy(String group)	Adds a GROUP BY expression to the query.
QueryBuilder	join(String join)	Adds a JOIN clause to the query.
QueryBuilder	join(String prefix, QueryBuilder join, String postfix)	Adds a JOIN clause with prefix and postfix using a subquery.
QueryBuilder	postAction(String action)	Sets a post-action clause (e.g., ORDER BY, LIMIT) to append after the main query.
QueryBuilder	where(String where)	Adds a WHERE condition to the query.
QueryBuilder	where(String prefix, QueryBuilder where)	Adds a WHERE condition with prefix using a subquery.
QueryBuilder	with(String alias, String cte)	Adds a Common Table Expression (CTE) to the WITH clause.
QueryBuilder	with(String alias, QueryBuilder cte)	Adds a Common Table Expression (CTE) using a subquery builder.

Methods inherited from class java.lang.Object

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

Constructor Details

QueryBuilder

public QueryBuilder()

Method Details

column

public QueryBuilder column(String column)

Adds a column to the SELECT clause.

Parameters:

column - the column expression to add

Returns:

this builder for method chaining

column

public QueryBuilder column(String prefix,
 QueryBuilder column,
 String postfix)

Adds a column with prefix and postfix using a subquery.

Parameters:

prefix - text to prepend before the subquery

column - the subquery builder for the column

postfix - text to append after the subquery

Returns:

this builder for method chaining

join

public QueryBuilder join(String join)

Adds a JOIN clause to the query.

Parameters:

join - the JOIN clause to add

Returns:

this builder for method chaining

join

public QueryBuilder join(String prefix,
 QueryBuilder join,
 String postfix)

Adds a JOIN clause with prefix and postfix using a subquery.

Parameters:

prefix - text to prepend before the subquery

join - the subquery builder for the join

postfix - text to append after the subquery

Returns:

this builder for method chaining

from

public QueryBuilder from(String from)

Sets the FROM clause of the query.

Parameters:

from - the FROM clause

Returns:

this builder for method chaining

from

public QueryBuilder from(QueryBuilder from,
 String postfix)

Sets the FROM clause using a subquery with postfix.

Parameters:

from - the subquery builder for the FROM clause

postfix - text to append after the subquery

Returns:

this builder for method chaining

where

public QueryBuilder where(String where)

Adds a WHERE condition to the query.

Parameters:

where - the WHERE condition to add

Returns:

this builder for method chaining

where

public QueryBuilder where(String prefix,
 QueryBuilder where)

Adds a WHERE condition with prefix using a subquery.

Parameters:

prefix - text to prepend before the subquery

where - the subquery builder for the WHERE condition

Returns:

this builder for method chaining

postAction

public QueryBuilder postAction(String action)

Sets a post-action clause (e.g., ORDER BY, LIMIT) to append after the main query.

Parameters:

action - the post-action clause

Returns:

this builder for method chaining

with

public QueryBuilder with(String alias,
 String cte)

Adds a Common Table Expression (CTE) to the WITH clause.

Parameters:

alias - the alias name for the CTE

cte - the CTE query string

Returns:

this builder for method chaining

with

public QueryBuilder with(String alias,
 QueryBuilder cte)

Adds a Common Table Expression (CTE) using a subquery builder.

Parameters:

alias - the alias name for the CTE

cte - the subquery builder for the CTE

Returns:

this builder for method chaining

groupBy

public QueryBuilder groupBy(String group)

Adds a GROUP BY expression to the query.

Parameters:

group - the GROUP BY expression

Returns:

this builder for method chaining

build

public String build()

Builds and returns the complete SQL query string.

Returns:

the constructed SQL query

copy

public QueryBuilder copy()

Creates a deep copy of this query builder.

Returns:

a new QueryBuilder instance with the same configuration