Query/drivers/pgsql/pgsql_sql.php

<?php
/**
 * Query
 *
 * Free Query Builder / Database Abstraction Layer
 *
 * @author 		Timothy J. Warren
 * @copyright	Copyright (c) 2012 - 2014
 * @link 		https://github.com/aviat4ion/Query
 * @license 	http://philsturgeon.co.uk/code/dbad-license
 */

// --------------------------------------------------------------------------

namespace Query\Driver;

/**
 * PostgreSQL specifc SQL
 *
 * @package Query
 * @subpackage Drivers
 */
class PgSQL_SQL extends Abstract_SQL {

	/**
	 * Get the query plan for the sql query
	 *
	 * @param string $sql
	 * @return string
	 */
	public function explain($sql)
	{
		return "EXPLAIN VERBOSE {$sql}";
	}

	// --------------------------------------------------------------------------

	/**
	 * Random ordering keyword
	 *
	 * @return string
	 */
	public function random()
	{
		return ' RANDOM()';
	}

	// --------------------------------------------------------------------------

	/**
	 * Returns sql to list other databases
	 *
	 * @return string
	 */
	public function db_list()
	{
		return <<<SQL
			SELECT "datname" FROM "pg_database"
			WHERE "datname" NOT IN ('template0','template1')
			ORDER BY "datname" ASC
SQL;
	}

	// --------------------------------------------------------------------------

	/**
	 * Returns sql to list tables
	 *
	 * @return string
	 */
	public function table_list()
	{
		return <<<SQL
			SELECT "table_name"
			FROM "information_schema"."tables"
			WHERE "table_type" = 'BASE TABLE'
			AND "table_schema" NOT IN
				('pg_catalog', 'information_schema');
SQL;
	}

	// --------------------------------------------------------------------------

	/**
	 * Returns sql to list system tables
	 *
	 * @return string
	 */
	public function system_table_list()
	{
		return <<<SQL
			SELECT "table_name"
			FROM "information_schema"."tables"
			WHERE "table_type" = 'BASE TABLE'
			AND "table_schema" IN
				('pg_catalog', 'information_schema');
SQL;
	}

	// --------------------------------------------------------------------------

	/**
	 * Returns sql to list views
	 *
	 * @return string
	 */
	public function view_list()
	{
		return <<<SQL
		 	SELECT "viewname" FROM "pg_views"
			WHERE "schemaname" NOT IN
				('pg_catalog', 'information_schema')
			AND "viewname" !~ '^pg_'
			ORDER BY "viewname" ASC
SQL;
	}

	// --------------------------------------------------------------------------

	/**
	 * Returns sql to list triggers
	 *
	 * @return string
	 */
	public function trigger_list()
	{
		return <<<SQL
			SELECT *
			FROM "information_schema"."triggers"
			WHERE "trigger_schema" NOT IN
				('pg_catalog', 'information_schema')
SQL;
	}

	// --------------------------------------------------------------------------

	/**
	 * Return sql to list functions
	 *
	 * @return NULL
	 */
	public function function_list()
	{
		return NULL;
	}

	// --------------------------------------------------------------------------

	/**
	 * Return sql to list stored procedures
	 *
	 * @return string
	 */
	public function procedure_list()
	{
		return <<<SQL
			SELECT "routine_name"
			FROM "information_schema"."routines"
			WHERE "specific_schema" NOT IN
				('pg_catalog', 'information_schema')
			AND "type_udt_name" != 'trigger';
SQL;
	}

	// --------------------------------------------------------------------------

	/**
	 * Return sql to list sequences
	 *
	 * @return string
	 */
	public function sequence_list()
	{
		return <<<SQL
			SELECT "c"."relname"
			FROM "pg_class" "c"
			WHERE "c"."relkind" = 'S'
			ORDER BY "relname" ASC
SQL;
	}

	// --------------------------------------------------------------------------

	/**
	 * Return sql to list columns of the specified table
	 *
	 * @param string $table
	 * @return string
	 */
	public function column_list($table)
	{
		return <<<SQL
			SELECT ordinal_position,
				column_name,
				data_type,
				column_default,
				is_nullable,
				character_maximum_length,
				numeric_precision
			FROM information_schema.columns
			WHERE table_name = '{$table}'
			ORDER BY ordinal_position;
SQL;
	}

	// --------------------------------------------------------------------------

	/**
	 * SQL to show list of field types
	 *
	 * @return string
	 */
	public function type_list()
	{
		return <<<SQL
			SELECT "typname" FROM "pg_catalog"."pg_type"
			WHERE "typname" !~ '^pg_|_'
			AND "typtype" = 'b'
			ORDER BY "typname"
SQL;
	}

	// --------------------------------------------------------------------------

	/**
	 * Get the list of foreign keys for the current
	 * table
	 *
	 * @parma string $table
	 * @return string
	 */
	public function fk_list($table)
	{
		return <<<SQL
		SELECT
			"att2"."attname" AS "child_column",
			"cl"."relname" AS "parent_table",
			"att"."attname" AS "parent_column"
		FROM
			(SELECT
				unnest(con1.conkey) AS "parent",
				unnest(con1.confkey) AS "child",
				"con1"."confrelid",
				"con1"."conrelid"
			FROM "pg_class" "cl"
			JOIN "pg_namespace" "ns" ON "cl"."relnamespace" = "ns"."oid"
			JOIN "pg_constraint" "con1" ON "con1"."conrelid" = "cl"."oid"
			WHERE "cl"."relname" = 'child_table'
				AND "ns"."nspname" = 'child_schema'
				AND "con1"."contype" = 'f'
			)
			"con"
			JOIN "pg_attribute" "att" ON
				"att"."attrelid" = "con"."confrelid"
					AND "att"."attnum" = "con"."child"
			JOIN "pg_class" "cl" ON
				"cl"."oid" = "con"."confrelid"
			JOIN "pg_attribute" "att2" ON
			   "att2"."attrelid" = "con"."conrelid"
				   AND "att2"."attnum" = "con"."parent"
SQL;
	}
}
//End of pgsql_sql.php