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<?php
/**
* `DELETE` statement.
*/
namespace SqlParser\Statements;
use SqlParser\Statement;
use SqlParser\Parser;
use SqlParser\Token;
use SqlParser\TokensList;
use SqlParser\Components\ArrayObj;
use SqlParser\Components\Expression;
use SqlParser\Components\ExpressionArray;
use SqlParser\Components\Limit;
use SqlParser\Components\OrderKeyword;
use SqlParser\Components\Condition;
use SqlParser\Components\OptionsArray;
/**
* `DELETE` statement.
*
* DELETE [LOW_PRIORITY] [QUICK] [IGNORE] FROM tbl_name
* [PARTITION (partition_name,...)]
* [WHERE where_condition]
* [ORDER BY ...]
* [LIMIT row_count]
*
* Multi-table syntax
*
* DELETE [LOW_PRIORITY] [QUICK] [IGNORE]
* tbl_name[.*] [, tbl_name[.*]] ...
* FROM table_references
* [WHERE where_condition]
*
* OR
*
* DELETE [LOW_PRIORITY] [QUICK] [IGNORE]
* FROM tbl_name[.*] [, tbl_name[.*]] ...
* USING table_references
* [WHERE where_condition]
*
*
* @category Statements
*
* @license https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
*/
class DeleteStatement extends Statement
{
/**
* Options for `DELETE` statements.
*
* @var array
*/
public static $OPTIONS = array(
'LOW_PRIORITY' => 1,
'QUICK' => 2,
'IGNORE' => 3,
);
/**
* The clauses of this statement, in order.
*
* @see Statement::$CLAUSES
*
* @var array
*/
public static $CLAUSES = array(
'DELETE' => array('DELETE', 2),
// Used for options.
'_OPTIONS' => array('_OPTIONS', 1),
'FROM' => array('FROM', 3),
'PARTITION' => array('PARTITION', 3),
'USING' => array('USING', 3),
'WHERE' => array('WHERE', 3),
'ORDER BY' => array('ORDER BY', 3),
'LIMIT' => array('LIMIT', 3),
);
/**
* Table(s) used as sources for this statement.
*
* @var Expression[]
*/
public $from;
/**
* Tables used as sources for this statement.
*
* @var Expression[]
*/
public $using;
/**
* Columns used in this statement.
*
* @var Expression[]
*/
public $columns;
/**
* Partitions used as source for this statement.
*
* @var ArrayObj
*/
public $partition;
/**
* Conditions used for filtering each row of the result set.
*
* @var Condition[]
*/
public $where;
/**
* Specifies the order of the rows in the result set.
*
* @var OrderKeyword[]
*/
public $order;
/**
* Conditions used for limiting the size of the result set.
*
* @var Limit
*/
public $limit;
/**
* @return string
*/
public function build()
{
$ret = 'DELETE ' . OptionsArray::build($this->options);
if ($this->columns != null && count($this->columns) > 0) {
$ret .= ' ' . ExpressionArray::build($this->columns);
}
if ($this->from != null && count($this->from) > 0) {
$ret .= ' FROM ' . ExpressionArray::build($this->from);
}
if ($this->using != null && count($this->using) > 0) {
$ret .= ' USING ' . ExpressionArray::build($this->using);
}
if ($this->where != null && count($this->where) > 0) {
$ret .= ' WHERE ' . Condition::build($this->where);
}
if ($this->order != null && count($this->order) > 0) {
$ret .= ' ORDER BY ' . ExpressionArray::build($this->order);
}
if ($this->limit != null && strlen($this->limit) > 0) {
$ret .= ' LIMIT ' . Limit::build($this->limit);
}
return $ret;
}
/**
* @param Parser $parser the instance that requests parsing
* @param TokensList $list the list of tokens to be parsed
*/
public function parse(Parser $parser, TokensList $list)
{
++$list->idx; // Skipping `DELETE`.
// parse any options if provided
$this->options = OptionsArray::parse(
$parser,
$list,
static::$OPTIONS
);
++$list->idx;
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 ---------------------------------[ FROM ]----------------------------------> 2
* 0 ------------------------------[ table[.*] ]--------------------------------> 1
* 1 ---------------------------------[ FROM ]----------------------------------> 2
* 2 --------------------------------[ USING ]----------------------------------> 3
* 2 --------------------------------[ WHERE ]----------------------------------> 4
* 2 --------------------------------[ ORDER ]----------------------------------> 5
* 2 --------------------------------[ LIMIT ]----------------------------------> 6
*
* @var int
*/
$state = 0;
/**
* If the query is multi-table or not.
*
* @var bool
*/
$multiTable = false;
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
*
* @var Token
*/
$token = $list->tokens[$list->idx];
// End of statement.
if ($token->type === Token::TYPE_DELIMITER) {
break;
}
if ($state === 0) {
if ($token->type === Token::TYPE_KEYWORD
&& $token->value !== 'FROM'
) {
$parser->error(__('Unexpected keyword.'), $token);
break;
} elseif ($token->type === Token::TYPE_KEYWORD
&& $token->value === 'FROM'
) {
++$list->idx; // Skip 'FROM'
$this->from = ExpressionArray::parse($parser, $list);
$state = 2;
} else {
$this->columns = ExpressionArray::parse($parser, $list);
$state = 1;
}
} elseif ($state === 1) {
if ($token->type === Token::TYPE_KEYWORD
&& $token->value !== 'FROM'
) {
$parser->error(__('Unexpected keyword.'), $token);
break;
} elseif ($token->type === Token::TYPE_KEYWORD
&& $token->value === 'FROM'
) {
++$list->idx; // Skip 'FROM'
$this->from = ExpressionArray::parse($parser, $list);
$state = 2;
} else {
$parser->error(__('Unexpected token.'), $token);
break;
}
} elseif ($state === 2) {
if ($token->type === Token::TYPE_KEYWORD
&& $token->value === 'USING'
) {
++$list->idx; // Skip 'USING'
$this->using = ExpressionArray::parse($parser, $list);
$state = 3;
$multiTable = true;
} elseif ($token->type === Token::TYPE_KEYWORD
&& $token->value === 'WHERE'
) {
++$list->idx; // Skip 'WHERE'
$this->where = Condition::parse($parser, $list);
$state = 4;
} elseif ($token->type === Token::TYPE_KEYWORD
&& $token->value === 'ORDER BY'
) {
++$list->idx; // Skip 'ORDER BY'
$this->order = OrderKeyword::parse($parser, $list);
$state = 5;
} elseif ($token->type === Token::TYPE_KEYWORD
&& $token->value === 'LIMIT'
) {
++$list->idx; // Skip 'LIMIT'
$this->limit = Limit::parse($parser, $list);
$state = 6;
} elseif ($token->type === Token::TYPE_KEYWORD) {
$parser->error(__('Unexpected keyword.'), $token);
break;
}
} elseif ($state === 3) {
if ($token->type === Token::TYPE_KEYWORD
&& $token->value === 'WHERE'
) {
++$list->idx; // Skip 'WHERE'
$this->where = Condition::parse($parser, $list);
$state = 4;
} elseif ($token->type === Token::TYPE_KEYWORD) {
$parser->error(__('Unexpected keyword.'), $token);
break;
} else {
$parser->error(__('Unexpected token.'), $token);
break;
}
} elseif ($state === 4) {
if ($multiTable === true
&& $token->type === Token::TYPE_KEYWORD
) {
$parser->error(
__('This type of clause is not valid in Multi-table queries.'),
$token
);
break;
}
if ($token->type === Token::TYPE_KEYWORD
&& $token->value === 'ORDER BY'
) {
++$list->idx; // Skip 'ORDER BY'
$this->order = OrderKeyword::parse($parser, $list);
$state = 5;
} elseif ($token->type === Token::TYPE_KEYWORD
&& $token->value === 'LIMIT'
) {
++$list->idx; // Skip 'LIMIT'
$this->limit = Limit::parse($parser, $list);
$state = 6;
} elseif ($token->type === Token::TYPE_KEYWORD) {
$parser->error(__('Unexpected keyword.'), $token);
break;
}
} elseif ($state === 5) {
if ($token->type === Token::TYPE_KEYWORD
&& $token->value === 'LIMIT'
) {
++$list->idx; // Skip 'LIMIT'
$this->limit = Limit::parse($parser, $list);
$state = 6;
} elseif ($token->type === Token::TYPE_KEYWORD) {
$parser->error(__('Unexpected keyword.'), $token);
break;
}
}
}
if ($state >= 2) {
foreach ($this->from as $from_expr) {
$from_expr->database = $from_expr->table;
$from_expr->table = $from_expr->column;
$from_expr->column = null;
}
}
--$list->idx;
}
}
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