Query/src/Drivers/Sqlite/SQL.php

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<?php declare(strict_types=1);
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/**
* Query
*
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* SQL Query Builder / Database Abstraction Layer
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*
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* PHP version 7.1
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*
* @package Query
* @author Timothy J. Warren <tim@timshomepage.net>
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* @copyright 2012 - 2018 Timothy J. Warren
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* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @link https://git.timshomepage.net/aviat4ion/Query
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*/
namespace Query\Drivers\Sqlite;
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use Query\Drivers\AbstractSQL;
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/**
* SQLite Specific SQL
*/
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class SQL extends AbstractSQL {
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/**
* Get the query plan for the sql query
*
* @param string $sql
* @return string
*/
public function explain($sql)
{
return "EXPLAIN QUERY PLAN {$sql}";
}
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/**
* Random ordering keyword
*
* @return string
*/
public function random()
{
return ' RANDOM()';
}
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/**
* Returns sql to list other databases
*
* @return string
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*/
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public function dbList()
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{
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return 'PRAGMA database_list';
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}
/**
* Returns sql to list tables
*
* @return string
*/
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public function tableList()
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{
return <<<SQL
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SELECT DISTINCT "name"
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FROM "sqlite_master"
WHERE "type"='table'
AND "name" NOT LIKE 'sqlite_%'
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ORDER BY "name" DESC
SQL;
}
/**
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* List the system tables
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*
* @return string[]
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*/
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public function systemTableList()
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{
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return ['sqlite_master', 'sqlite_temp_master', 'sqlite_sequence'];
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}
/**
* Returns sql to list views
*
* @return string
*/
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public function viewList()
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{
return <<<SQL
SELECT "name" FROM "sqlite_master" WHERE "type" = 'view'
SQL;
}
/**
* Returns sql to list triggers
*
* @return string
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*/
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public function triggerList()
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{
return 'SELECT "name" FROM "sqlite_master" WHERE "type"=\'trigger\'';
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}
/**
* Return sql to list functions
*
* @return NULL
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*/
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public function functionList()
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{
return NULL;
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}
/**
* Return sql to list stored procedures
*
* @return NULL
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*/
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public function procedureList()
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{
return NULL;
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}
/**
* Return sql to list sequences
*
* @return NULL
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*/
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public function sequenceList()
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{
return NULL;
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}
/**
* SQL to show list of field types
*
* @return string[]
*/
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public function typeList()
{
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return ['INTEGER', 'REAL', 'TEXT', 'BLOB'];
}
/**
* SQL to show infromation about columns in a table
*
* @param string $table
* @return string
*/
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public function columnList($table)
{
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return 'PRAGMA table_info("' . $table . '")';
}
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/**
* Get the list of foreign keys for the current
* table
*
* @param string $table
* @return string
*/
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public function fkList($table)
{
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return 'PRAGMA foreign_key_list("' . $table . '")';
}
/**
* Get the list of indexes for the current table
*
* @param string $table
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* @return string
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*/
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public function indexList($table)
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{
return 'PRAGMA index_list("' . $table . '")';
}
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}