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PDO->sqliteCreateAggregate()
Registers an aggregating User Defined Function for use in SQL statements
()
PDO {
bool sqliteCreateAggregate(string function_name,
callback step_func,
callback finalize_func,
int num_args);
}This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.
This method is similar to PDO->sqliteCreateFunction() except that it registers functions that can be used to calculate a result aggregated across all the rows of a query.
The key difference between this method and PDO->sqliteCreateFunction() is that two functions are required to manage the aggregate.
Parameters
- function_name
The name of the function used in SQL statements.
- step_func
Callback function called for each row of the result set. Your PHP function should accumulate the result and store it in the aggregation context.
This function need to be defined as:
contextwill beNULLfor the first row; on subsequent rows it will have the value that was previously returned from the step function; you should use this to maintain the aggregate state.rownumberwill hold the current row number.- finalize_func
Callback function to aggregate the "stepped" data from each row. Once all the rows have been processed, this function will be called and it should then take the data from the aggregation context and return the result. Callback functions should return a type understood by SQLite (i.e. scalar type).
This function need to be defined as:
contextwill hold the return value from the very last call to the step function.rownumberwill hold the number of rows over which the aggregate was performed.The return value of this function will be used as the return value for the aggregate.
- num_args
Hint to the SQLite parser if the callback function accepts a predetermined number of arguments.
Examples
Example 2341. max_length aggregation function example
<?php
$data = array(
'one',
'two',
'three',
'four',
'five',
'six',
'seven',
'eight',
'nine',
'ten',
);
$db = new PDO('sqlite::memory:');
$db->exec("CREATE TABLE strings(a)");
$insert = $db->prepare('INSERT INTO strings VALUES (?)');
foreach ($data as $str) {
$insert->execute(array($str));
}
$insert = null;
function max_len_step(&$context, $rownumber, $string)
{
if (strlen($string) > $context) {
$context = strlen($string);
}
}
function max_len_finalize(&$context, $rownumber)
{
return $context;
}
$db->sqliteCreateAggregate('max_len', 'max_len_step', 'max_len_finalize');
var_dump($db->query('SELECT max_len(a) from strings')->fetchAll());
?>
In this example, we are creating an aggregating function that will
calculate the length of the longest string in one of the columns of the
table. For each row, the max_len_step function is
called and passed a context parameter. The context
parameter is just like any other PHP variable and be set to hold an array
or even an object value. In this example, we are simply using it to hold
the maximum length we have seen so far; if the
string has a length longer than the current
maximum, we update the context to hold this new maximum length.
After all of the rows have been processed, SQLite calls the
max_len_finalize function to determine the aggregate
result. Here, we could perform some kind of calculation based on the
data found in the context. In our simple example
though, we have been calculating the result as the query progressed, so we
simply need to return the context value.
It is NOT recommended for you to store a copy of the values in the context and then process them at the end, as you would cause SQLite to use a lot of memory to process the query - just think of how much memory you would need if a million rows were stored in memory, each containing a string 32 bytes in length.
You can use PDO->sqliteCreateFunction() and PDO->sqliteCreateAggregate() to override SQLite native SQL functions.
This method is not available with the SQLite2 driver. Use the old style sqlite API for that instead.