SQLite3Result::fetchArray
(PHP 5 >= 5.3.0)
SQLite3Result::fetchArray — Fetches a result row as an associative or numerically indexed array or both
Описание
$mode = SQLITE3_BOTH
] )Fetches a result row as an associative or numerically indexed array or both. By default, fetches as both.
Список параметров
-
mode -
Controls how the next row will be returned to the caller. This value must be one of either SQLITE3_ASSOC, SQLITE3_NUM, or SQLITE3_BOTH.
-
SQLITE3_ASSOC: returns an array indexed by column name as returned in the corresponding result set
-
SQLITE3_NUM: returns an array indexed by column number as returned in the corresponding result set, starting at column 0
-
SQLITE3_BOTH: returns an array indexed by both column name and number as returned in the corresponding result set, starting at column 0
-
Возвращаемые значения
Returns a result row as an associatively or numerically indexed array or
both. Alternately will return FALSE if there are no more rows.
- PHP Руководство
- Функции по категориям
- Индекс функций
- Справочник функций
- Расширения для работы с базами данных
- Расширения для работы с базами данных отдельных производителей
- SQLite3
- Функция SQLite3Result::columnName() - Returns the name of the nth column
- Функция SQLite3Result::columnType() - Returns the type of the nth column
- Функция SQLite3Result::fetchArray() - Fetches a result row as an associative or numerically indexed array or both
- Функция SQLite3Result::finalize() - Closes the result set
- Функция SQLite3Result::numColumns() - Returns the number of columns in the result set
- Функция SQLite3Result::reset() - Resets the result set back to the first row
Коментарии
To loop through a record set:
<?php
$db = new SQLite3('auth.sqlite');
$sql = "SELECT user_id, username, opt_status FROM tbl_user";
$result = $db->query($sql);//->fetchArray(SQLITE3_ASSOC);
$row = array();
$i = 0;
while($res = $result->fetchArray(SQLITE3_ASSOC)){
if(!isset($res['user_id'])) continue;
$row[$i]['user_id'] = $res['user_id'];
$row[$i]['username'] = $res['username'];
$row[$i]['opt_status'] = $res['opt_status'];
$i++;
}
print_r($row);
?>
Would just like to point out for clarification that each call to fetchArray() returns the next result from SQLite3Result in an array, until there are no more results, whereupon the next fetchArray() call will return false.
HOWEVER an additional call of fetchArray() at this point will reset back to the beginning of the result set and once again return the first result. This does not seem to explicitly documented, and caused me my own fair share of headaches for a while until I figured it out.
For example:
<?php
$returned_set = $database->query("select query or whatever");
//Lets say the query returned 3 results
//Normally the following while loop would run 3 times then, as $result wouldn't be false until the fourth call to fetchArray()
while($result = $returned_set->fetchArray()) {
//HOWEVER HAVING AN ADDITIONAL CALL IN THE LOOP WILL CAUSE THE LOOP TO RUN AGAIN
$returned_set->fetchArray();
}
?>
Basically, in the above code fetchArray will return:
1st call | 1st result from $returned_set (fetchArray() call from while condition)
2nd call | 2nd result (fetchArray() call from while block)
3rd call | 3rd result (fetchArray() call from while condition)
4th call |FALSE (fetchArray() call from while block)
5th call | 1st result (fetchArray() call from while condition)
....
This will cause (at least in this case) the while loop to run infinitely.
// Open a new sqlite3 DB
$db = new SQLite3('./DB_EHLH.db');
// select all information from table "algorithm"
$results= $db->query("select * from algorithm");
//Create array to keep all results
$data= array();
// Fetch Associated Array (1 for SQLITE3_ASSOC)
while ($res= $results->fetchArray(1))
{
//insert row into array
array_push($data, $res);
}
//you can return a JSON array
echo json_encode($data);
//the output is a s follows
[
{"id":1,"algorithm":"GA"},
{"id":2,"algorithm":"PSO"},
{"id":3,"algorithm":"IWO"},
{"id":4,"algorithm":"OIWO"}
]
Check with SQLite3Result::numColumns() for an empty result before calling SQLite3Result::fetchArray().
In contrast to the documentation SQLite3::query() always returns a SQLite3Result instance, not only for queries returning rows (SELECT, EXPLAIN). Each time SQLite3Result::fetchArray() is called on a result from a result-less query internally the query is executed again, which will most probably break your application.
For a framwork or API it's not possible to know in before whether or not a query will return rows (SQLite3 supports multi-statement queries). Therefore the argument "Don't execute query('CREATE ...')" is not valid.