SQLite3::query

    (PHP 5 >= 5.3.0, PHP 7, PHP 8)

    SQLite3::query — Executes an SQL query

    Опис

    public SQLite3::query(string $query): SQLite3Result|false

    Executes an SQL query, returning an SQLite3Result object. If the query does not yield a result (such as DML statements) the returned SQLite3Result object is not really usable. Use SQLite3::exec() for such queries instead.

    Параметри

    query

    The SQL query to execute.

    Значення, що повертаються

    Returns an SQLite3Result object, або false в разі помилки.

    Приклади

    Приклад #1 SQLite3::query() example

    <?php
    $db     = new SQLite3('mysqlitedb.db');

    $results = $db->query('SELECT bar FROM foo');
    while (    $row = $results->fetchArray()) {
    var_dump($row);
    }
    ?>

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    User Contributed Notes 2 notes

    up
    42
    bohwaz
    11 years ago
    The recommended way to do a SQLite3 query is to use a statement. For a table creation, a query might be fine (and easier) but for an insert, update or select, you should really use a statement, it's really easier and safer as SQLite will escape your parameters according to their type. SQLite will also use less memory than if you created the whole query by yourself. Example:

    <?php

    $db     = new SQLite3;
    $statement = $db->prepare('SELECT * FROM table WHERE id = :id;');
    $statement->bindValue(':id', $id);

    $result = $statement->execute();

    ?>

    You can also re-use a statement and change its parameters, just do $statement->reset(). Finally don't forget to close a statement when you don't need it anymore as it will free some memory.
    up
    0
    paule-panke at example dot com
    7 years ago
    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.
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