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Dokumen ini menggunakan Manual laman web PHP Cina Lepaskan
Represents an opened SQLite database.
Represents a buffered SQLite result set.
Represents an unbuffered SQLite result set. Unbuffered results sets are sequential, forward-seeking only.
[#1] CraquePipe [2011-09-16 05:54:12]
The SQLite manual mentions that queries are done in a case-sensitive way, this means your query must be the correct case. It also mentions that using the "LIKE" operator will do a case-insensitive selection. This is true, but this also introduces wildcard symbols which a user could enter without getting filtered by the SQLite escape function. I'm somewhat new to SQL and I didn't think of doing this before, even after looking for a decent way to do case-insensitive queries.
For case-insensitive queries, simply use the built in "lower" function.
<?php
// ...
$name = 'bARbarA';
$rows = $db->arrayQuery('select * from blah where lower(name) = lower(\''.sqlite_escape_string($name).'\');');
// $rows might contain an entry for "Barbara" now.
?>
[#2] papafox888 at hotmail dot com [2006-06-01 21:05:19]
If you get an error message:
Warning: sqlite_open() [function.sqlite-open]: file is encrypted or is not a database
then most probably your code is accessing a SQLite3 database.
sqlite_open() only supports SQLite2. Use PDO to access SQLite3.
[#3] heinemann.juergen AT t-online.de [2005-11-11 09:53:17]
Simple Example for using SQLite for small Buffering Clipboard ;)
<?php
// $Id: SQLiteClipboard.php5,v 1.1 2005/09/09 10:15:26 heinemann Exp $
final class SQLiteClipboard
{
private $SQL;
private $DB = "Clipboard.sqlite";
private $TB = "Clipboard";
private $ID = "ID";
private $PA = "PARAM";
private $VA = "VAL";
function __construct( $path )
{
$this->DB = chop( $path . "/" . $this->DB );
$this->sql_init();
}
private function sql_init()
{
$this->SQL = new SQLiteDatabase( $this->DB, 0660 );
if ( ! file_exists( $this->DB ) )
die( "Permission Denied!" );
$q = $this->SQL->query("PRAGMA table_info(" . $this->TB . ")");
if ( $q->numRows() == 0 ) {
$this->SQL->query( "CREATE TABLE " . $this->TB . " ( " . $this->ID . " INTEGER PRIMARY KEY, " . $this->PA . " CHAR(255), " . $this->VA . " CHAR(255) );" );
}
}
private function sql_check( $p )
{
$o = null;
$q = $this->SQL->query( "SELECT " . $this->ID . " FROM " . $this->TB . " WHERE ( " . $this->PA . "='$p' ) ORDER BY " . $this->ID . " LIMIT 1" );
while( $q->valid() ) {
$r = $q->current();
return $r[$this->ID];
$q->next();
}
return false;
}
public function __get( $p )
{
$q = $this->SQL->query( "SELECT " . $this->VA . " FROM " . $this->TB . " WHERE ( " . $this->PA . "='$p' ) ORDER BY " . $this->ID );
while( $q->valid() ) {
$r = $q->current();
$o = $r[$this->VA];
$q->next();
}
return $o;
}
public function __set( $p, $v )
{
if ( $this->sql_check( $p ) && ! empty( $v ) )
return $this->SQL->query( "UPDATE " . $this->TB . " SET " . $this->VA . "='$v' WHERE ( " . $this->PA . "='$p' );" );
elseif ( ! $this->sql_check( $p ) && ! empty( $v ) )
return $this->SQL->query( "INSERT INTO " . $this->TB . " ( " . $this->PA . ", " . $this->VA . " ) VALUES ('$p', '$v' );" );
elseif ( $this->sql_check( $p ) && empty( $v ) )
return $this->SQL->query( "DELETE FROM " . $this->TB . " WHERE ( " . $this->PA . "='$p' );" );
else
return false;
}
} // end Class
?>
[#4] [2005-08-31 16:21:48]
A function to check whether a table exists:
<?php
function sqlite_table_exists(&$sqlite, $table)
{
$result = $sqlite->query("SELECT name FROM sqlite_master WHERE type='table' AND name='$table'");
return $result->numRows() > 0;
}
?>
[#5] bens at effortlessis dot com [2005-07-14 11:37:36]
Sqlite by default allows for foreign keys, but doesn't enforce them.
I found a nice article on how to enforce foreign keys at http://www.justatheory.com/computers/databases/sqlite/
It would be nice if this could be handled with a wrapper class, so that adding foreign keys is done thru a wrapper API to automate the generation of the necessary enforcement triggers. If nobody's done this by the time I start coding against SqlLite/PHP5 in 6-12 months, I'll write one myself, possibly by modifying "jon at jenseng dot com"s alter table wrapper
Anyway, it's not PHP specific, but anybody using Sqlite really should know this!
[#6] Stephen Leaf [2005-06-30 05:58:21]
I think it would be good to point out that currently (as of 5.0.4) this extention does not support SQLite 3 databases.
So if your getting an error message like:
Error: file is encrypted or is not a database
That is why.
[#7] bart at mediawave dot nl [2005-04-18 07:30:58]
SELECT tablename.columnname FROM table;
will cause SQLite to return an array having tablename.field_name as the array index. (e.g. $result['tablename.field_name'])
To let SQLite return an array having only field_name as the array index (e.g. $result['field_name']) you can issue a 'PRAGMA short_column_names = 1' query:
sqlite_query($connection_id, 'PRAGMA short_column_names = 1');
This behaviour is more consistent with the other database extensions.
For a full list of all pragmas visit: http://sqlite.org/pragma.html
[#8] dotwho at NOSPAM dot mac dot com [2005-02-09 18:03:19]
This may have been obvious to others, but I had a tough time finding the info.
The default location for the actual database file is the same location of the php doc that created the database. You can alter this behavior by specifying the full path in the creation call:
<?php
$db = sqlite_open("/absolute/path/my_sqlite.db");
?>
Note that if you used the default location, the db file may be served up by the webserver if it is in a the http document path. This is obviously a security risk that should be avoided.
//Max
[#9] hunreal+php at gmail dot com [2005-01-16 08:42:15]
Check the db/table if exist
$db_name='db';
$db=new SQLiteDatabase($db_name, 0666, $error);
if ($error) exit($error);
$q=$db->query("PRAGMA table_info(test)");
if ($q->numRows()!=2) {
if (!@$db->queryexec("
CREATE TABLE test (
id INTEGER NOT NULL PRIMARY KEY,
text VARCHAR ( 255 ) NOT NULL
)")
) exit ("Create SQLite Database Error\n");
}
[#10] nicolas dot toniazzi at free dot fr [2004-11-16 07:24:48]
The same in 3 lines.
<?php
function sqlite_table_exists($db,$mytable) {
$result = sqlite_query($db,"SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name='$mytable'");
$count = intval(sqlite_fetch_single($result));
return $count > 0;
}
?>
[#11] artooro at gmail dot com [2004-10-21 18:26:29]
If you need to check if a table exists, you can use a function like this:
<?php
//Returns TRUE if table exists and FALSE otherwise
// $mytable = table you want to check for
function sqlite_table_exists($mytable) {
$db = sqlite_open('mydb.sqlite', 0666, $sqliteerror);
$query = sqlite_query($db, "SELECT name FROM sqlite_master WHERE type='table'");
$tables = sqlite_fetch_array($query);
if ($tables != '') {
foreach ($tables as $table) {
if ($table == $mytable) {
return("TRUE");
}
else {
return("FALSE");
}
}
}
else {
return("FALSE");
}
}
?>
A function like this could be used to create the table if it's not already created, etc.
[#12] j-pieper at NOSPAM dot web dot de [2004-10-19 03:18:30]
If you want to create a table in your database which should have an integer primary key, you cannot declare the row like this:
id int(16) primary key
or
id integer(16) primary key
When you declare it like this it could be that the id isn't auto increment. You have to declare it like this:
id integer primary key
[#13] filip at filipdewaard dot com [2004-09-09 23:39:29]
I've written a short article about the (lack of) use of SQLite in-memory databases: http://www.filipdewaard.com/21_SQLite_inmemory_databases.html . Hopefully it will help somebody out there ;)
[#14] philip [2004-08-08 14:59:10]
SQLite tutorials:
* http://www.zend.com/php5/articles/php5-sqlite.php
* http://www.zend.com/php5/abs/php101-9.php
* http://www.oreilly.com/catalog/upgradephp5/chapter/ch04.pdf
[#15] david at acz dot org [2004-07-14 18:29:34]
You can use the PECL SQLite extension as a static (built into the executable) PHP module with PHP 4. Download the extension tarball and extract it. Move it to ext/sqlite in the PHP source directory. Delete configure and run buildconf.
Example below. Change version numbers as appropriate:
$ tar -xzvf php-4.3.8.tar.gz
$ tar -xzvf SQLite-1.0.2.tgz
$ mv SQLite-1.0.2 php-4.3.8/ext/sqlite
$ cd php-4.3.8
$ rm configure
$ ./buildconf --force
If everything worked, then you should now be able to build PHP with SQLite support:
$ ./configure --help | grep sqlite
--with-sqlite Include sqlite support
I think this method will work for other PECL extensions.
[#16] [2004-05-13 07:46:59]
PHP5 compile time option --enable-sqlite-utf8
See the note about buggy utf-8 support http://uk.php.net/manual/en/function.sqlite-libencoding.php
[#17] csaba at alum dot mit dot edu [2004-04-14 08:16:10]
If you want to get the list of all the columns in a table (and associated information), PRAGMA is helpful (see http://sqlite.org/lang.html#pragma for details):
if (!($db=@sqlite_open("delme.db",0666,$sqliteerror))) die("Can't open database");
@sqlite_query ($db, 'DROP TABLE foo;');
sqlite_query($db, "CREATE TABLE foo (bar INTEGER PRIMARY KEY, baz VARCHAR(5));");
$aTableStruct = sqlite_array_query($db, "PRAGMA table_info('foo');", SQLITE_ASSOC);
for ($i=0,$aNames=array();$i<sizeof($aTableStruct);++$i)
$aNames[]=$aTableStruct[$i]['name'];
var_dump ($aNames); // => ['bar', 'baz']
Note also that if you want to use more than one database in the same connection using "ATTACH DATABASE ..." then you should supply the complete database filename.
Csaba Gabor
[#18] cricket at djcricket dot com [2004-03-31 09:30:13]
To elaborate on vpupkin at comcast dot net's post about the INSERT query problem, you will be unable to execute any manipulation queries (INSERT/UPDATE/DELETE/ect) on the SQLite database file unless the directory the SQLite database file resides in is writable by the webserver.
The reason for this is because SQLite needs to write a lock file to the hard drive. After a processes finishes writting, it deletes the lock file. Other processes check for the lock file before writting to the SQLite database file and if present, delay writting until the lock file is no longer present.
[#19] jlsalinas at spamsucks dot gmx dot net [2004-02-13 18:22:51]
For those looking for a function similar to mysql_list_tables, here you have:
if (! function_exists ('sqlite_list_tables')) {
function sqlite_list_tables (&$dblink) {
$tables = array ();
$sql = "SELECT name FROM sqlite_master WHERE (type = 'table')";
if ($res = sqlite_query ($dblink, $sql)) {
while (sqlite_has_more($res)) {
$tables[] = sqlite_fetch_single($res);
}
}
return $tables;
}
}
And a related funtion, to test if a given table exists:
if (! function_exists ('sqlite_table_exists')) {
function sqlite_table_exists (&$dblink, $table) {
$sql = "SELECT count(name) FROM sqlite_master WHERE ((type = 'table') and (name = '$table'))";
if ($res = sqlite_query ($dblink, $sql)) {
return sqlite_fetch_single($res) > 0;
} else {
return false; // or throw exception
}
}
}
Of course it would be preferable to have these functions included in the library, to avoid potential changes internal to SQLite; but we'll have to stick to this method until then.
[#20] vpupkin at comcast dot net [2003-11-30 20:53:04]
if you are going to send INSERT queries, you will need to make the folder, where you put your "file.db", writable by a web server user, otherwise you'll receive error message - "Unable to open database . . . ". File permissions are not enough (phpinfo - SQLite Lib 2.8.3)
[#21] Minots Estich <minots at D0X dot de> [2003-11-21 18:47:27]
If you gone in trouble while/with installation of sqlite,
you can try the installation steps I've done at
RedHat9 with PHP4.3.4 and Apache 1.3.28
via the Linux shell:
# wget http://pecl.php.net/get/SQLite-1.0.tgz
# tar xzf SQLite-1.0.tgz
# cd sqlite
# export PHP_PREFIX="/usr"
# $PHP_PREFIX/bin/phpize
# ./configure
# make
# make install
After that add following to php.ini and restart Apache:
[sqlite]
extension="sqlite.so"
[#22] ng4rrjanbiah at rediffmail dot com [2003-11-07 07:19:21]
Very nice MS PowerPoint presentation titled "SQLite and PHP" (author: Wez Furlong) can be downloaded at http://www.php.net/~wez/SQLite_and_PHP.ppt [134 KB]
HTH,
R. Rajesh Jeba Anbiah