两个表的联合和计数与条件

Question

我必须在zend-framework2中编写以下查询

select count(*) from  
(
    select * from table1
    UNION
    select * from table2
)
as a
where col1 = condition1 and col2 = condition2;

我使用 -

完成了两个表的联合

$select1 = new Select('table1');
$select2 = new Select("table2");
$select1->combine($select2);

我不知道在完成两个表的并集以及如何获取数据之后如何给别名。

Answer 1

$select1->combine($select2); -

之后

$sql = new Sql($this->tableGateway->adapter);
$select_string = $sql->getSqlStringForSqlObject($select1);

$sql_string = 'SELECT * FROM (' . $select_string . ') AS select_union WHERE col1 = condition1 and col2 = condition2';
$statement = $this->tableGateway->adapter->createStatement($sql_string);
$resultSet = $statement->execute();
$total_records = count($resultSet);

$resultSet提供数据。

$total_records给出总数。记录。