sqlite_query

SQLiteDatabase::query

(PHP 5 < 5.4.0, PECL sqlite >= 1.0.0)

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

Descrierea

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

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

Stil obiect-orientat (method):

public SQLiteDatabase::query ( string $query [, int $result_type = SQLITE_BOTH [, string &$error_msg ]] ) : SQLiteResult

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

Parametri

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.

Data inside the query should be properly escaped.

result_type

Parametrul opțional result_type acceptă o constantă și determină cum tablouul întors va fi indexat. Utilizând SQLITE_ASSOC vor fi întorși numai indici asociativi (câmpuri denumite) în timp ce cu SQLITE_NUM vor fi întorși numai indici numerici (numerele de ordine ale câmpurilor). Cu SQLITE_BOTH vor fi întorși atât indici associativi, cât și numerici. SQLITE_BOTH este valoarea implicită pentru această funcție.

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.

Notă: Două sintaxe alternative sunt susținute pentru compatibilitate cu alte extensii de baze de date (cum ar fi MySQL). Forma preferată este cea dintâi, unde parametrul dbhandle este primul parametru pentru funcție.

Valorile întoarse

This function will return a result handle sau FALSE în cazul eșecului. 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.

Istoricul schimbărilor

Versiune	Descriere
5.1.0	Added the `error_msg` parameter

Note

Avertizare

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).

A se vedea și

sqlite_unbuffered_query() - Execute a query that does not prefetch and buffer all data
sqlite_array_query() - Execute a query against a given database and returns an array

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User Contributed Notes 7 notes

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helmakil at gmail dot com ¶

16 years ago


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.

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glenn at byte-consult dot be ¶

12 years ago


Not a lot of examples on using the oo style of using sqlite files.  Maybe this helps someone trying to figure out all the names of the tables inside an sqlite file.

<?php

/* Just extend the class, add our method */
class MySQLiteDatabase extends SQLiteDatabase {

   /* A neat way to see which tables are inside a valid sqlite file */
   public function getTables()  {
      $tables=array();
      $q = $this->query(sprintf("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name"));
      $result = $q->fetchAll();
      foreach($result as $tot_table) {
         $tables[]=$tot_table['name'];
      }
      return($tables);
   }
}

/* a sqlite file */
$database="BLAHBLAH.sqlite";

if (file_exists($database)) {
   $db = new MySQLiteDatabase($database, 0666, $err);
   if ($err) {
      trigger_error($err);
   } else {
      print_r($db->getTables());
   }
}

/* this sqlite db had 2 tables:
   Array
   (
   [0] => Account
   [1] => Device
   )

 */
?>

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bruce at causal dot com ¶

15 years ago


In follow up to Csaba Gabor's function (see below) that allows for multi-statement queries to be executed via sqlite_query() this alternative implementation avoids a problem with Csaba's version (which prevents multi-statement constructs like CREATE TRIGGER from being parsed correctly).
<?php 
function sqlite_query_multi ($db, $query) { 
 //
 // sqlite_query() rewritten to support concatenated SQL statements.
 //
 // This method works around the sqlite_query() deficiency by splitting
 // queries into two parts; the first part comprising all the statements
 // except the last one (executed via sqlite_exec) and then the last
 // statement (executed via sqlite_query).
 //
 // This allows the result of the last SELECT statement in a multi-statement
 // query to be accessed regardless of the SQL statements that came before it. 
 // It also allows execution of arbitrary multi-statement programs regardless
 // whether the result is needed, subject to the following constraint:
 //
 // This method requires that the last statement in a multi-statement query
 // is a valid "stand-alone" SQL statement. If it is not (eg, the "END;" of
 // a multi-statement construct such as CREATE TRIGGER) append an additional
 // ";" (ie, a NULL statement). Normally this should not be needed because
 // almost all the multi-statement constructs I can think of should have a
 // stand-alone statement following them (ie, to makes use of the construct).
 //
    $pattern = '/^(.*;)(.*;)/s';
    if ( preg_match($pattern,$query,$match) ) { 
     // multi-statement query
        sqlite_exec($db,$match[1]);
        $result = sqlite_query($db,$match[2]);
    } else { 
     // single-statement query
        $result = sqlite_query($db,$query);
    }
    return (@$result);
}
?>

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jason at fatpipeinc dot com ¶

19 years ago


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

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csaba at alum dot mit dot edu ¶

20 years ago


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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-1

Anonymous ¶

20 years ago


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');

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-2

jason at fatpipeinc dot com ¶

19 years ago


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)

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