Query/drivers/pgsql/pgsql_sql.php

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2012-04-10 14:06:34 -04:00
<?php
/**
* Query
*
* Free Query Builder / Database Abstraction Layer
*
* @author Timothy J. Warren
* @copyright Copyright (c) 2012
* @link https://github.com/aviat4ion/Query
* @license http://philsturgeon.co.uk/code/dbad-license
*/
// --------------------------------------------------------------------------
/**
* PostgreSQL specifc SQL
*/
class pgSQL_SQL extends DB_SQL {
/**
* Database-specific method to create a new table
*
* @param string $name
* @param array $columns
* @param array $constraints
* @param array $indexes
* @return string
*/
public function create_table($name, $columns, array $constraints=array(), array $indexes=array())
{
$column_array = array();
// Reorganize into an array indexed with column information
// Eg $column_array[$colname] = array(
// 'type' => ...,
// 'constraint' => ...,
// 'index' => ...,
// )
foreach($columns as $colname => $type)
{
if(is_numeric($colname))
{
$colname = $type;
}
$column_array[$colname] = array();
$column_array[$colname]['type'] = ($type !== $colname) ? $type : '';
}
if( ! empty($constraints))
{
foreach($constraints as $col => $const)
{
$column_array[$col]['constraint'] = $const;
}
}
// Join column definitons together
$columns = array();
foreach($column_array as $n => $props)
{
$str = "{$n} ";
$str .= (isset($props['type'])) ? "{$props['type']} " : "";
$str .= (isset($props['constraint'])) ? $props['constraint'] : "";
$columns[] = $str;
}
// Generate the sql for the creation of the table
$sql = "CREATE TABLE \"{$name}\" (";
$sql .= implode(", ", $columns);
$sql .= ")";
return $sql;
}
// --------------------------------------------------------------------------
/**
* Database-specific SQL for dropping a table
*
* @param string $name
* @return string
*/
public function delete_table($name)
{
return 'DROP TABLE "'.$name.'"';
}
// --------------------------------------------------------------------------
/**
* 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;
}
// --------------------------------------------------------------------------
/**
* Random ordering keyword
*
* @return string
*/
public function random()
{
return ' RANDOM()';
}
// --------------------------------------------------------------------------
/**
* Create an SQL backup file for the current database's structure
*
* @return string
*/
public function backup_structure()
{
// @todo Implement Backup function
return '';
}
// --------------------------------------------------------------------------
/**
* Create an SQL backup file for the current database's data
*
* @return string
*/
public function backup_data()
{
// @todo Implement Backup function
return '';
}
// --------------------------------------------------------------------------
/**
* 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 "tablename" FROM "pg_tables"
WHERE "tablename" NOT LIKE 'pg_%'
AND "tablename" NOT LIKE 'sql_%'
ORDER BY "tablename" ASC
SQL;
}
// --------------------------------------------------------------------------
/**
* Returns sql to list system tables
*
* @return string
*/
public function system_table_list()
{
return <<<SQL
SELECT "tablename" FROM "pg_tables"
WHERE "tablename" LIKE 'pg\_%'
OR "tablename" LIKE 'sql\%'
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 FALSE
*/
public function function_list()
{
return FALSE;
}
// --------------------------------------------------------------------------
/**
* 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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// --------------------------------------------------------------------------
/**
* 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;
}
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}
//End of pgsql_manip.php