sqlite_query

SQLiteDatabase->query

(No version information available, might be only in CVS)

SQLiteDatabase->query — Executes a query against a given database and returns a result handle

Description

resource sqlite_query ( resource $dbhandle , string $query [, int $result_type [, string &$error_msg ]] )

resource sqlite_query ( string $query , resource $dbhandle [, int $result_type [, string &$error_msg ]] )

Object oriented style (method):

SQLiteDatabase

SQLiteResult query ( string $query [, int $result_type [, string &$error_msg ]] )

Executes an SQL statement given by the query against a given database handle.

Parameters

dbhandle: The SQLite Database resource; returned from sqlite_open() when used procedurally. This parameter is not required when using the object-oriented method.
query: The query to be executed.
result_type: The optional result_type parameter accepts a constant and determines how the returned array will be indexed. Using SQLITE_ASSOC will return only associative indices (named fields) while SQLITE_NUM will return only numerical indices (ordinal field numbers). SQLITE_BOTH will return both associative and numerical indices. SQLITE_BOTH is the default for this function.
error_msg: The specified variable will be filled if an error occurs. This is specially important because SQL syntax errors can't be fetched using the sqlite_last_error() function.

Note: Two alternative syntaxes are supported for compatibility with other database extensions (such as MySQL). The preferred form is the first, where the dbhandle parameter is the first parameter to the function.

Return Values

This function will return a result handle or FALSE on failure. For queries that return rows, the result handle can then be used with functions such as sqlite_fetch_array() and sqlite_seek().

Regardless of the query type, this function will return FALSE if the query failed.

sqlite_query() returns a buffered, seekable result handle. This is useful for reasonably small queries where you need to be able to randomly access the rows. Buffered result handles will allocate memory to hold the entire result and will not return until it has been fetched. If you only need sequential access to the data, it is recommended that you use the much higher performance sqlite_unbuffered_query() instead.

ChangeLog

Version	Description
5.1.0	Added the `error_msg` parameter

Notes

Warning

SQLite will execute multiple queries separated by semicolons, so you can use it to execute a batch of SQL that you have loaded from a file or have embedded in a script. However, this works only when the result of the function is not used - if it is used, only the first SQL statement would be executed. Function sqlite_exec() will always execute multiple SQL statements.

When executing multiple queries, the return value of this function will be FALSE if there was an error, but undefined otherwise (it might be TRUE for success or it might return a result handle).


I suppose this could be useful for users attempting to use a sqlite database for the first time.

<?php

$database = new SQLiteDatabase($yourfile, 0666, $error);

if (!$database) {

    $error = (file_exists($yourfile)) ? "Impossible to open, check permissions" : "Impossible to create, check permissions";

    die($error);

}

$query = $database->query("SELECT name FROM sqlite_master WHERE type='table'", SQLITE_ASSOC, $query_error); #Lists all tables

if ($query_error)

    die("Error: $query_error"); #This means that most probably we catch a syntax error

if (!$query)

    die("Impossible to execute query.") #As reported above, this means that the db owner is different from the web server's one, but we did not commit any syntax mistake.

print $query->numRows();

while ($row = $query->fetch())

    print($row['name']."\n");

?>

i suppose that the example above is also useful because it will list all the tables created, giving also comprehension of what appens when managing a sqlite database in OO mode.

jason at fatpipeinc dot com
27-Oct-2005 03:32


Correction:



sqlite_query will return NULL if the web server cannot write to the sqlite database file.



(please correct the previous post and delete this one)

jason at fatpipeinc dot com
24-Oct-2005 05:35


sqlite_open will return NULL if the web server cannot write to the sqlite database file.



I saw the following message in my web server error log:



PHP Warning:  sqlite_query(): (null) ...



It turns out that the sqlite database file was owned by a user other than the one the web server was running as.  In my case, it was a Linux system running Apache (which was running under the context of user apache).  The sqlite database file was owned by root.  I changed ownership of the file to user apache and now it works!  The sqlite_open call now returns a valid result handle.



Jason Aeschilman

05-Oct-2004 09:54


While reading the manual at sqlite.org, I can answer for the quotes in strings. You should put two quote to get one. 



insert into atable values ( '5 O''Clock');

csaba at alum dot mit dot edu
30-Apr-2004 02:41


The function below allows you to submit multiple queries in one shot to a SQLITE database, and will return whatever you would get for the final query.



function sqlite_query_multi ($db, $query) {

    // submit multiple queries (separated by ;) to $db

    // and return the result from the last one

    $multiSQL = "/('[^']*'|\"[^\"]*\"|[^;'\"])*;/";

    preg_match_all ($multiSQL, "$query;", $aSQL);

    for ($i=sizeof($aSQL=$aSQL[0]);$i--;)

    if (!($trim=trim(substr($aSQL[$i],0,-1))))

        unset ($aSQL[$i]);

        else $aSQL[$i] = "$trim;";

    foreach ($aSQL as $i => $sql)

    $dbRes = sqlite_query ($db, $sql);

    return (@$dbRes);

}



The section below illustrates the above function:



$db = sqlite_open(":memory:", 0666, $sqliteerror);

$query = <<<EOD

CREATE TABLE foo (bar INTEGER PRIMARY KEY, baz TEXT);

INSERT INTO foo VALUES (Null, 'Hi');

INSERT INTO foo VALUES (Null, 'Mom');

SELECT * FROM foo;

EOD;

$dbRes = sqlite_query_multi ($db, $query);  // 4 statements

while (sqlite_has_more($dbRes))

    var_dump(sqlite_fetch_array($dbRes, SQLITE_ASSOC));



Csaba Gabor

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Last updated: Fri, 27 Jun 2008