Query/drivers/pgsql/pgsql_sql.php

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<?php
/**
* Query
*
* Free Query Builder / Database Abstraction Layer
*
* @author Timothy J. Warren
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* @copyright Copyright (c) 2012 - 2014
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* @link https://github.com/aviat4ion/Query
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* @license http://philsturgeon.co.uk/code/dbad-license
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*/
// --------------------------------------------------------------------------
/**
* PostgreSQL specifc SQL
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*
* @package Query
* @subpackage Drivers
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*/
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class PgSQL_SQL implements iDB_SQL {
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/**
* Limit clause
*
* @param string $sql
* @param int $limit
* @param int $offset
* @return string
*/
public function limit($sql, $limit, $offset=FALSE)
{
$sql .= " LIMIT {$limit}";
if(is_numeric($offset))
{
$sql .= " OFFSET {$offset}";
}
return $sql;
}
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// --------------------------------------------------------------------------
/**
* Get the query plan for the sql query
*
* @param string $sql
* @return string
*/
public function explain($sql)
{
return "EXPLAIN VERBOSE {$sql}";
}
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// --------------------------------------------------------------------------
/**
* 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');
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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');
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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
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SELECT *
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FROM "information_schema"."triggers"
WHERE "trigger_schema" NOT IN
('pg_catalog', 'information_schema')
SQL;
}
// --------------------------------------------------------------------------
/**
* Return sql to list functions
*
* @return NULL
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*/
public function function_list()
{
return NULL;
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}
// --------------------------------------------------------------------------
/**
* 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;
}
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// --------------------------------------------------------------------------
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/**
* Return sql to list columns of the specified table
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*
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* @param string $table
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* @return string
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*/
public function column_list($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()
{
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return <<<SQL
SELECT "typname" FROM "pg_catalog"."pg_type"
WHERE "typname" !~ '^pg_|_'
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AND "typtype" = 'b'
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ORDER BY "typname"
SQL;
}
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}
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//End of pgsql_manip.php