在Zend_db_select中更改表名称

Question

SELECT SUM(Table.ColumnThatChanges) AS 'Count', Table.B as 'Param'
FROM Table
WHERE Table.C = 4
    AND Table.B = 'Something'
    AND Table.Date BETWEEN '2014-01-01 00:00:00' AND '2014-06-30 00:00:00'

I have this SQL Query that I generate in php. I want to call this query quite a few times with a slight change; I am changing ColumnThatChanges every request.

What would be the better/fastest way to do this? Use str_replace? Call the entire string everytime? Use some type of class that generates my SQL statement?

I'm currently generating it this way with Zend:

$somequery = $this->db->select();
$somequery->from(Table, array('SUM(Table.ColumnThatChanges) AS Count', 'Table.B as Param'))
->where('C = ?', $Variable)
->where('B = ?', $Variable2)
->where('Date > ?', $start_date)
->where('Date < ?', $end_date);

I haven't had much success changing the ColumnThatChanges part of the query, maybe I'm doing it wrong?

Answer 1

If you can use PDO extension, there are prepared statements for this

<?php
$stmt = $dbh->prepare("INSERT INTO REGISTRY (name, value) VALUES (:name, :value)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':value', $value);

// insert one row
$name = 'one';
$value = 1;
$stmt->execute();

// insert another row with different values
$name = 'two';
$value = 2;
$stmt->execute();

In Zend Framework it can be achieved using Zend_Db_Statement

UPD If you want to change columns, as it stated here , you can use columns method or second argument to from method;

$select = $db->select()
         ->from(array('p' => 'products'), 'product_id')
         ->columns('product_name');

Then if you want to change anything, all you need is to preserve your $select object.

UPD-2 Bill Karwin has provided a better answer for a last version of the question. Please look at it.

Answer 2

If you're using PDO, you can bind parameters. So loop through your entries, and execute with the different data. I'm not sure if this is clear or not... ... oh wait, baldrs has an example. However, you can also pass an array to execute:

$stuff = array(':name' => 'one', ':value' => 1);
$stmt->execute($stuff);

Answer 3

I wrote Zend_Db_Select for Zend Framework 1.0. There is no method to replace columns in the select-list, only to append or insert columns.

It's not hard to create a custom class to add this capability, though.

class My_Db_Select extends Zend_Db_Select
{
  public function clearColumns() {
    $this->_parts[self::COLUMNS] = array();
  }
}

Test out clearing the columns and adding different columns:

$sel = new My_Db_Select($db);
$sel->from("foo", array());

$sel->columns(array("SUM(foo.red)", "id"), "foo");
echo $sel . "\n";

$sel->clearColumns();

$sel->columns(array("SUM(foo.blue)", "id"), "foo");
echo $sel . "\n";

Output:

SELECT SUM(foo.red), `foo`.`id` FROM `foo`
SELECT SUM(foo.blue), `foo`.`id` FROM `foo`