PHP MySQL Wrapper and object mapper which utilizes MySQLi and prepared statements

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v2.9.3 2019-08-24 09:28 UTC

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Last update: 2021-09-24 04:18:11 UTC


MysqliDb -- Simple MySQLi wrapper and object mapper with prepared statements

Table of Contents

Objects mapping
Insert Query
Update Query
Select Query
Delete Query
Insert Data
Insert XML
Running raw SQL queries
Query Keywords
Where Conditions
Order Conditions
Group Conditions
Properties Sharing
Joining Tables
Has method
Helper Methods
Transaction Helpers
Error Helpers
Table Locking

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To utilize this class, first import MysqliDb.php into your project, and require it.

require_once ('MysqliDb.php');

Installation with composer

It is also possible to install library via composer

composer require thingengineer/mysqli-database-class:dev-master


Simple initialization with utf8 charset set by default:

$db = new MysqliDb ('host', 'username', 'password', 'databaseName');

Advanced initialization:

$db = new MysqliDb (Array (
                'host' => 'host',
                'username' => 'username', 
                'password' => 'password',
                'db'=> 'databaseName',
                'port' => 3306,
                'prefix' => 'my_',
                'charset' => 'utf8'));

table prefix, port and database charset params are optional. If no charset should be set charset, set it to null

Also it is possible to reuse already connected mysqli object:

$mysqli = new mysqli ('host', 'username', 'password', 'databaseName');
$db = new MysqliDb ($mysqli);

If no table prefix were set during object creation its possible to set it later with a separate call:

$db->setPrefix ('my_');

If connection to mysql will be dropped Mysqlidb will try to automatically reconnect to the database once. To disable this behavoir use

$db->autoReconnect = false;

If you need to get already created mysqliDb object from another class or function use

    function init () {
        // db staying private here
        $db = new MysqliDb ('host', 'username', 'password', 'databaseName');
    function myfunc () {
        // obtain db object created in init  ()
        $db = MysqliDb::getInstance();

Multiple database connection

If you need to connect to multiple databases use following method:

$db->addConnection('slave', Array (
                'host' => 'host',
                'username' => 'username',
                'password' => 'password',
                'db'=> 'databaseName',
                'port' => 3306,
                'prefix' => 'my_',
                'charset' => 'utf8')

To select database use connection() method

$users = $db->connection('slave')->get('users');

Objects mapping

dbObject.php is an object mapping library built on top of mysqliDb to provide model representation functionality. See dbObject manual for more information

Insert Query

Simple example

$data = Array ("login" => "admin",
               "firstName" => "John",
               "lastName" => 'Doe'
$id = $db->insert ('users', $data);
    echo 'user was created. Id=' . $id;

Insert with functions use

$data = Array (
	'login' => 'admin',
    'active' => true,
	'firstName' => 'John',
	'lastName' => 'Doe',
	'password' => $db->func('SHA1(?)',Array ("secretpassword+salt")),
	// password = SHA1('secretpassword+salt')
	'createdAt' => $db->now(),
	// createdAt = NOW()
	'expires' => $db->now('+1Y')
	// expires = NOW() + interval 1 year
	// Supported intervals [s]econd, [m]inute, [h]hour, [d]day, [M]onth, [Y]ear

$id = $db->insert ('users', $data);
if ($id)
    echo 'user was created. Id=' . $id;
    echo 'insert failed: ' . $db->getLastError();

Insert with on duplicate key update

$data = Array ("login" => "admin",
               "firstName" => "John",
               "lastName" => 'Doe',
               "createdAt" => $db->now(),
               "updatedAt" => $db->now(),
$updateColumns = Array ("updatedAt");
$lastInsertId = "id";
$db->onDuplicate($updateColumns, $lastInsertId);
$id = $db->insert ('users', $data);

Insert multiple datasets at once

$data = Array(
    Array ("login" => "admin",
        "firstName" => "John",
        "lastName" => 'Doe'
    Array ("login" => "other",
        "firstName" => "Another",
        "lastName" => 'User',
        "password" => "very_cool_hash"
$ids = $db->insertMulti('users', $data);
if(!$ids) {
    echo 'insert failed: ' . $db->getLastError();
} else {
    echo 'new users inserted with following id\'s: ' . implode(', ', $ids);

If all datasets only have the same keys, it can be simplified

$data = Array(
    Array ("admin", "John", "Doe"),
    Array ("other", "Another", "User")
$keys = Array("login", "firstName", "lastName");

$ids = $db->insertMulti('users', $data, $keys);
if(!$ids) {
    echo 'insert failed: ' . $db->getLastError();
} else {
    echo 'new users inserted with following id\'s: ' . implode(', ', $ids);

Replace Query

Replace() method implements same API as insert();

Update Query

$data = Array (
	'firstName' => 'Bobby',
	'lastName' => 'Tables',
	'editCount' => $db->inc(2),
	// editCount = editCount + 2;
	'active' => $db->not()
	// active = !active;
$db->where ('id', 1);
if ($db->update ('users', $data))
    echo $db->count . ' records were updated';
    echo 'update failed: ' . $db->getLastError();

update() also support limit parameter:

$db->update ('users', $data, 10);
// Gives: UPDATE users SET ... LIMIT 10

Select Query

After any select/get function calls amount or returned rows is stored in $count variable

$users = $db->get('users'); //contains an Array of all users 
$users = $db->get('users', 10); //contains an Array 10 users

or select with custom columns set. Functions also could be used

$cols = Array ("id", "name", "email");
$users = $db->get ("users", null, $cols);
if ($db->count > 0)
    foreach ($users as $user) { 
        print_r ($user);

or select just one row

$db->where ("id", 1);
$user = $db->getOne ("users");
echo $user['id'];

$stats = $db->getOne ("users", "sum(id), count(*) as cnt");
echo "total ".$stats['cnt']. "users found";

or select one column value or function result

$count = $db->getValue ("users", "count(*)");
echo "{$count} users found";

select one column value or function result from multiple rows:

$logins = $db->getValue ("users", "login", null);
// select login from users
$logins = $db->getValue ("users", "login", 5);
// select login from users limit 5
foreach ($logins as $login)
    echo $login;

Insert Data

You can also load .CSV or .XML data into a specific table. To insert .csv data, use the following syntax:

$path_to_file = "/home/john/file.csv";
$db->loadData("users", $path_to_file);

This will load a .csv file called file.csv in the folder /home/john/ (john's home directory.) You can also attach an optional array of options. Valid options are:

	"fieldChar" => ';', 	// Char which separates the data
	"lineChar" => '\r\n', 	// Char which separates the lines
	"linesToIgnore" => 1	// Amount of lines to ignore at the beginning of the import

Attach them using

$options = Array("fieldChar" => ';', "lineChar" => '\r\n', "linesToIgnore" => 1);
$db->loadData("users", "/home/john/file.csv", $options);
// LOAD DATA ...

You can specify to use LOCAL DATA instead of DATA:

$options = Array("fieldChar" => ';', "lineChar" => '\r\n', "linesToIgnore" => 1, "loadDataLocal" => true);
$db->loadData("users", "/home/john/file.csv", $options);

Insert XML

To load XML data into a table, you can use the method loadXML. The syntax is smillar to the loadData syntax.

$path_to_file = "/home/john/file.xml";
$db->loadXML("users", $path_to_file);

You can also add optional parameters. Valid parameters:

	"linesToIgnore" => 0,		// Amount of lines / rows to ignore at the beginning of the import
	"rowTag"	=> "<user>"	// The tag which marks the beginning of an entry


$options = Array("linesToIgnore" => 0, "rowTag"	=> "<user>"):
$path_to_file = "/home/john/file.xml";
$db->loadXML("users", $path_to_file, $options);


Use paginate() instead of get() to fetch paginated result

$page = 1;
// set page limit to 2 results per page. 20 by default
$db->pageLimit = 2;
$products = $db->arraybuilder()->paginate("products", $page);
echo "showing $page out of " . $db->totalPages;

Result transformation / map

Instead of getting an pure array of results its possible to get result in an associative array with a needed key. If only 2 fields to fetch will be set in get(), method will return result in array($k => $v) and array ($k => array ($v, $v)) in rest of the cases.

$user = $db->map ('login')->ObjectBuilder()->getOne ('users', 'login, id');
    [user1] => 1

$user = $db->map ('login')->ObjectBuilder()->getOne ('users', 'id,login,createdAt');
    [user1] => stdClass Object
            [id] => 1
            [login] => user1
            [createdAt] => 2015-10-22 22:27:53


Defining a return type

MysqliDb can return result in 3 different formats: Array of Array, Array of Objects and a Json string. To select a return type use ArrayBuilder(), ObjectBuilder() and JsonBuilder() methods. Note that ArrayBuilder() is a default return type

// Array return type
$u= $db->getOne("users");
echo $u['login'];
// Object return type
$u = $db->ObjectBuilder()->getOne("users");
echo $u->login;
// Json return type
$json = $db->JsonBuilder()->getOne("users");

Running raw SQL queries

$users = $db->rawQuery('SELECT * from users where id >= ?', Array (10));
foreach ($users as $user) {
    print_r ($user);

To avoid long if checks there are couple helper functions to work with raw query select results:

Get 1 row of results:

$user = $db->rawQueryOne('SELECT * from users where id=?', Array(10));
echo $user['login'];
// Object return type
$user = $db->ObjectBuilder()->rawQueryOne('SELECT * from users where id=?', Array(10));
echo $user->login;

Get 1 column value as a string:

$password = $db->rawQueryValue('SELECT password from users where id=? limit 1', Array(10));
echo "Password is {$password}";
NOTE: for a rawQueryValue() to return string instead of an array 'limit 1' should be added to the end of the query.

Get 1 column value from multiple rows:

$logins = $db->rawQueryValue('SELECT login from users limit 10');
foreach ($logins as $login)
    echo $login;

More advanced examples:

$params = Array(1, 'admin');
$users = $db->rawQuery("SELECT id, firstName, lastName FROM users WHERE id = ? AND login = ?", $params);
print_r($users); // contains Array of returned rows

// will handle any SQL query
$params = Array(10, 1, 10, 11, 2, 10);
$q = "(
    SELECT a FROM t1
        WHERE a = ? AND B = ?
        ORDER BY a LIMIT ?
    SELECT a FROM t2 
        WHERE a = ? AND B = ?
        ORDER BY a LIMIT ?
$results = $db->rawQuery ($q, $params);
print_r ($results); // contains Array of returned rows

Where / Having Methods

where(), orWhere(), having() and orHaving() methods allows you to specify where and having conditions of the query. All conditions supported by where() are supported by having() as well.

WARNING: In order to use column to column comparisons only raw where conditions should be used as column name or functions cannot be passed as a bind variable.

Regular == operator with variables:

$db->where ('id', 1);
$db->where ('login', 'admin');
$results = $db->get ('users');
// Gives: SELECT * FROM users WHERE id=1 AND login='admin';
$db->where ('id', 1);
$db->having ('login', 'admin');
$results = $db->get ('users');
// Gives: SELECT * FROM users WHERE id=1 HAVING login='admin';

Regular == operator with column to column comparison:

$db->where ('lastLogin', 'createdAt');
$db->where ('lastLogin = createdAt');
$results = $db->get ('users');
// Gives: SELECT * FROM users WHERE lastLogin = createdAt;
$db->where ('id', 50, ">=");
// or $db->where ('id', Array ('>=' => 50));
$results = $db->get ('users');
// Gives: SELECT * FROM users WHERE id >= 50;


$db->where('id', Array (4, 20), 'BETWEEN');
// or $db->where ('id', Array ('BETWEEN' => Array(4, 20)));

$results = $db->get('users');
// Gives: SELECT * FROM users WHERE id BETWEEN 4 AND 20


$db->where('id', Array(1, 5, 27, -1, 'd'), 'IN');
// or $db->where('id', Array( 'IN' => Array(1, 5, 27, -1, 'd') ) );

$results = $db->get('users');
// Gives: SELECT * FROM users WHERE id IN (1, 5, 27, -1, 'd');


$db->where ('firstName', 'John');
$db->orWhere ('firstName', 'Peter');
$results = $db->get ('users');
// Gives: SELECT * FROM users WHERE firstName='John' OR firstName='peter'

NULL comparison:

$db->where ("lastName", NULL, 'IS NOT');
$results = $db->get("users");
// Gives: SELECT * FROM users where lastName IS NOT NULL

LIKE comparison:

$db->where ("fullName", 'John%', 'like');
$results = $db->get("users");
// Gives: SELECT * FROM users where fullName like 'John%'

Also you can use raw where conditions:

$db->where ("id != companyId");
$db->where ("DATE(createdAt) = DATE(lastLogin)");
$results = $db->get("users");

Or raw condition with variables:

$db->where ("(id = ? or id = ?)", Array(6,2));
$db->where ("login","mike");
$res = $db->get ("users");
// Gives: SELECT * FROM users WHERE (id = 6 or id = 2) and login='mike';

Find the total number of rows matched. Simple pagination example:

$offset = 10;
$count = 15;
$users = $db->withTotalCount()->get('users', Array ($offset, $count));
echo "Showing {$count} from {$db->totalCount}";

Query Keywords

To add LOW PRIORITY | DELAYED | HIGH PRIORITY | IGNORE and the rest of the mysql keywords to INSERT (), REPLACE (), GET (), UPDATE (), DELETE() method or FOR UPDATE | LOCK IN SHARE MODE into SELECT ():

$db->setQueryOption ('LOW_PRIORITY')->insert ($table, $param);
$db->setQueryOption ('FOR UPDATE')->get ('users');

Also you can use an array of keywords:

$db->setQueryOption (Array('LOW_PRIORITY', 'IGNORE'))->insert ($table,$param);

Same way keywords could be used in SELECT queries as well:

$db->setQueryOption ('SQL_NO_CACHE');

Optionally you can use method chaining to call where multiple times without referencing your object over and over:

$results = $db
	->where('id', 1)
	->where('login', 'admin')

Delete Query

$db->where('id', 1);
if($db->delete('users')) echo 'successfully deleted';

Ordering method

$db->orderBy("RAND ()");
$results = $db->get('users');
// Gives: SELECT * FROM users ORDER BY id ASC,login DESC, RAND ();

Order by values example:

$db->orderBy('userGroup', 'ASC', array('superuser', 'admin', 'users'));
// Gives: SELECT * FROM users ORDER BY FIELD (userGroup, 'superuser', 'admin', 'users') ASC;

If you are using setPrefix () functionality and need to use table names in orderBy() method make sure that table names are escaped with ``.

$db->setPrefix ("t_");
$db->orderBy ("","asc");
$results = $db->get ('users');
// WRONG: That will give: SELECT * FROM t_users ORDER BY ASC;

$db->setPrefix ("t_");
$db->orderBy ("`users`.id", "asc");
$results = $db->get ('users');
// CORRECT: That will give: SELECT * FROM t_users ORDER BY ASC;

Grouping method

$db->groupBy ("name");
$results = $db->get ('users');
// Gives: SELECT * FROM users GROUP BY name;

JOIN method

Join table products with table users with LEFT JOIN by tenantID

$db->join("users u", "p.tenantID=u.tenantID", "LEFT");
$db->where("", 6);
$products = $db->get ("products p", null, ", p.productName");
print_r ($products);
// Gives: SELECT, p.productName FROM products p LEFT JOIN users u ON p.tenantID=u.tenantID WHERE = 6

Join Conditions

Add AND condition to join statement

$db->join("users u", "p.tenantID=u.tenantID", "LEFT");
$db->joinWhere("users u", "u.tenantID", 5);
$products = $db->get ("products p", null, ", p.productName");
print_r ($products);
// Gives: SELECT, p.productName FROM products p LEFT JOIN users u ON (p.tenantID=u.tenantID AND u.tenantID = 5)

Add OR condition to join statement

$db->join("users u", "p.tenantID=u.tenantID", "LEFT");
$db->joinOrWhere("users u", "u.tenantID", 5);
$products = $db->get ("products p", null, ", p.productName");
print_r ($products);
// Gives: SELECT  u.login, p.productName FROM products p LEFT JOIN users u ON (p.tenantID=u.tenantID OR u.tenantID = 5)

Properties sharing

It is also possible to copy properties

$db->where ("agentId", 10);
$db->where ("active", true);

$customers = $db->copy ();
$res = $customers->get ("customers", Array (10, 10));
// SELECT * FROM customers WHERE agentId = 10 AND active = 1 LIMIT 10, 10

$cnt = $db->getValue ("customers", "count(id)");
echo "total records found: " . $cnt;
// SELECT count(id) FROM customers WHERE agentId = 10 AND active = 1


Subquery init

Subquery init without an alias to use in inserts/updates/where Eg. (select * from users)

$sq = $db->subQuery();
$sq->get ("users");

A subquery with an alias specified to use in JOINs . Eg. (select * from users) sq

$sq = $db->subQuery("sq");
$sq->get ("users");

Subquery in selects:

$ids = $db->subQuery ();
$ids->where ("qty", 2, ">");
$ids->get ("products", null, "userId");

$db->where ("id", $ids, 'in');
$res = $db->get ("users");
// Gives SELECT * FROM users WHERE id IN (SELECT userId FROM products WHERE qty > 2)

Subquery in inserts:

$userIdQ = $db->subQuery ();
$userIdQ->where ("id", 6);
$userIdQ->getOne ("users", "name"),

$data = Array (
    "productName" => "test product",
    "userId" => $userIdQ,
    "lastUpdated" => $db->now()
$id = $db->insert ("products", $data);
// Gives INSERT INTO PRODUCTS (productName, userId, lastUpdated) values ("test product", (SELECT name FROM users WHERE id = 6), NOW());

Subquery in joins:

$usersQ = $db->subQuery ("u");
$usersQ->where ("active", 1);
$usersQ->get ("users");

$db->join($usersQ, "", "LEFT");
$products = $db->get ("products p", null, "u.login, p.productName");
print_r ($products);
// SELECT u.login, p.productName FROM products p LEFT JOIN (SELECT * FROM t_users WHERE active = 1) u on;


$sub = $db->subQuery();
$sub->where("company", 'testCompany');
$sub->get ("users", null, 'userId');
$db->where (null, $sub, 'exists');
$products = $db->get ("products");
// Gives SELECT * FROM products WHERE EXISTS (SELECT userId FROM users WHERE company='testCompany')

Has method

A convenient function that returns TRUE if exists at least an element that satisfy the where condition specified calling the "where" method before this one.

$db->where("user", $user);
$db->where("password", md5($password));
if($db->has("users")) {
    return "You are logged";
} else {
    return "Wrong user/password";

Helper methods

Disconnect from the database:


Reconnect in case mysql connection died:

if (!$db->ping())

Get last executed SQL query: Please note that this method returns the SQL query only for debugging purposes as its execution most likely will fail due to missing quotes around char variables.

    echo "Last executed query was ". $db->getLastQuery();

Check if table exists:

    if ($db->tableExists ('users'))
        echo "hooray";

mysqli_real_escape_string() wrapper:

    $escaped = $db->escape ("' and 1=1");

Transaction helpers

Please keep in mind that transactions are working on innoDB tables. Rollback transaction if insert fails:

if (!$db->insert ('myTable', $insertData)) {
    //Error while saving, cancel new record
} else {

Error helpers

After you executed a query you have options to check if there was an error. You can get the MySQL error string or the error code for the last executed query.

$db->where('login', 'admin')->update('users', ['firstName' => 'Jack']);

if ($db->getLastErrno() === 0)
    echo 'Update succesfull';
    echo 'Update failed. Error: '. $db->getLastError();

Query execution time benchmarking

To track query execution time setTrace() function should be called.

$db->setTrace (true);
// As a second parameter it is possible to define prefix of the path which should be striped from filename
// $db->setTrace (true, $_SERVER['SERVER_ROOT']);
print_r ($db->trace);
    [0] => Array
            [0] => SELECT  * FROM t_users ORDER BY `id` ASC
            [1] => 0.0010669231414795
            [2] => MysqliDb->get() >>  file "/avb/work/PHP-MySQLi-Database-Class/tests.php" line #151

    [1] => Array
            [0] => SELECT  * FROM t_test
            [1] => 0.00069189071655273
            [2] => MysqliDb->get() >>  file "/avb/work/PHP-MySQLi-Database-Class/tests.php" line #152

Table Locking

To lock tables, you can use the lock method together with setLockMethod. The following example will lock the table users for write access.


Calling another ->lock() will remove the first lock. You can also use


to unlock the previous locked tables. To lock multiple tables, you can use an array. Example:

$db->setLockMethod("READ")->lock(array("users", "log"));

This will lock the tables users and log for READ access only. Make sure you use *unlock() afterwards or your tables will remain locked!