SunshinePHP Developer Conference 2015

SQLite Funções

Classes pré-definidas

SQLiteDatabase

Representa um banco de dados SQLite aberto.

Construtor

  • __construct - constrói um novo objeto SQLiteDatabase

Métodos

  • query - Executa uma query

  • queryExec - Executa uma query sem resultado

  • arrayQuery - Executa uma query e retorna o resultado em um array

  • singleQuery - Executa uma query e retorna um array para uma única coluna ou valor da primeira linha

  • unbufferedQuery - Executa uma query sem buffer

  • lastInsertRowid - Retorna o rowid da linha mais recente inserida

  • changes - Retorna o número de linhas modificadas pelo comando mais recente

  • createAggregate - Registra uma função UDF agregada para usar em comandos SQL

  • createFunction - Registra uma função UDF para usar em comandos SQL

  • busyTimeout - Define ou desativa o limite de tempo de ocupado

  • lastError - Retorna o código de erro mais recente do erro mais recente encontrado

  • fetchColumnTypes - Retorna um array dos tipos das colunas de uma tabela em particular

SQLiteResult

Representa um conjunto de resultados guardado em buffer.

Métodos

  • fetch - Obtém a próxima linha de um conjunto de resultados em uma matriz

  • fetchObject - Obtém a próxima linha de um conjunto de resultados como um objeto

  • fetchSingle - Obtém a primeira coluna do conjunto de resultados como uma string

  • fetchAll - Obtém todas as linhas de um conjunto de resultados como um array de arrays

  • column - Obtém uma coluna da linha atual do conjunto de resultados

  • numFields - Retorna o número de campos no conjunto de resultados

  • fieldName - Retorna o nome de um campo em particular do conjunto de resultados

  • current - Obtém a linha atual do conjunto de resultados como um array

  • key - Retorna o índice da linha atual

  • next - Vai para o próximo número de linha

  • valid - Retorna quando mais linhas estão disponíveis

  • rewind - Vai para a primeira linha do conjunto de resultados

  • prev - Vai para a linha anterior do conjunto de resultados

  • hasPrev - Retorna quando a linha anterior no conjunto de resultados é valida

  • numRows - Retorna o número de linhas no conjunto de resultados

  • seek - Vai para uma linha em particular

SQLiteUnbuffered

Representa uma conjunto de resultados de uma consulta SQLite não salva em buffer. Conjuntos de resultados não salvos em buffer são sequenciais, apenas para a frente.

Métodos

  • fetch - Obtém a próxima linha do conjunto de resultados como um array

  • fetchObject - Obtém a próxima linha de um conjuntpo de resultados como um objeto

  • fetchSingle - Obtém a primeira coluna do conjunto de resultados como uma string

  • fetchAll - Obtém todoas as linhas do conjunto de resultados como um array de arrays

  • column - Obtém uma coluna da linha atual do conjunto de resultados

  • numFields - Retorna o número de campos do conjunto de resultados

  • fieldName - Retorna o nome de um campo em particular no conjunto de resultados

  • current - Obtém a linha atual do conjunto de resultados como um array

  • next - Vai para a próxima linha

  • valid - Retorna se tem mais linhas disponíveis

Índice

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User Contributed Notes 22 notes

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3
Anonymous
9 years ago
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;
}
?>
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1
bart at mediawave dot nl
9 years ago
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
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0
CraquePipe
3 years ago
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.
?>
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0
papafox888 at hotmail dot com
8 years ago
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.
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0
heinemann.juergen AT t-online.de
8 years ago
Simple Example for using SQLite for small Buffering Clipboard ;)

<?php

// $Id: SQLiteClipboard.php5,v 1.1 2005/09/09 10:15:26 heinemann Exp $

/**
* @callgraph
* @class      SQLiteClipboard
* @short      Simple Read/Write Clipboard Class
* @version    0.0.1
* @since      Fr Sep  9 08:14:45 CEST 2005
* @code
   $sqlite = new SQLiteClipboard( MY_TEMP_DIR );
   if ( $sqlite->INSERTING = time() )
      var_dump( $sqlite->INSERTING );
   else
      echo "Nothing done!";
* @endcode
*/

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

?>
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0
bens at effortlessis dot com
9 years ago
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!
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0
Stephen Leaf
9 years ago
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.
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0
dotwho at NOSPAM dot mac dot com
9 years ago
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
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0
hunreal+php at gmail dot com
9 years ago
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");
}
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0
nicolas dot toniazzi at free dot fr
9 years ago
The same in 3 lines.

<?php
function sqlite_table_exists($db,$mytable) {
 
/* counts the tables that match the name given */
 
$result = sqlite_query($db,"SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name='$mytable'");

 
/* casts into integer */
 
$count = intval(sqlite_fetch_single($result));

 
/* returns true or false */
 
return $count > 0;
}
?>
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0
j-pieper at NOSPAM dot web dot de
10 years ago
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
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0
filip at filipdewaard dot com
10 years ago
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 ;)
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0
david at acz dot org
10 years ago
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.
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0
Anonymous
10 years ago
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
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0
csaba at alum dot mit dot edu
10 years ago
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
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0
cricket at djcricket dot com
10 years ago
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.
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0
jlsalinas at spamsucks dot gmx dot net
10 years ago
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.
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0
vpupkin at comcast dot net
10 years ago
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)
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0
Minots Estich <minots at D0X dot de>
10 years ago
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"
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0
ng4rrjanbiah at rediffmail dot com
10 years ago
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
up
-1
artooro at gmail dot com
10 years ago
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.
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