GitHub - nightstomp/PHP-MySQLi-Database-Class: Wrapper for a PHP MySQL class, which utilizes MySQLi and prepared statements.

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

### Table of Contents **[Initialization](#initialization)** **[Objects mapping](#objects-mapping)** **[Insert Query](#insert-query)** **[Update Query](#update-query)** **[Select Query](#select-query)** **[Delete Query](#delete-query)** **[Running raw SQL queries](#running-raw-sql-queries)** **[Query Keywords](#query-keywords)** **[Raw Query](#raw-query-method)** **[Where Conditions](#where-method)** **[Order Conditions](#ordering-method)** **[Group Conditions](#grouping-method)** **[Properties Sharing](#properties-sharing)** **[Joining Tables](#join-method)** **[Subqueries](#subqueries)** **[EXISTS / NOT EXISTS condition](#exists--not-exists-condition)** **[Has method](#has-method)** **[Helper Functions](#helper-commands)** **[Transaction Helpers](#transaction-helpers)**

Installation

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 joshcam/mysqli-database-class:dev-master

Initialization

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 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();
        ...
    }

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', $data);
if($id)
    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;
else
    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 ("updateAt");
$lastInsertId = "id";
$db->onDuplicate($updateColumns, $lastInsertId);
$id = $db->insert ('users', $data);

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';
else
    echo 'update failed: ' . $db->getLastError();

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: ``php $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;



### 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
```php
// Array return type
$= $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 ?
) UNION (
    SELECT a FROM t2 
        WHERE a = ? AND B = ?
        ORDER BY a LIMIT ?
)";
$resutls = $db->rawQuery ($q, $params);
print_r ($results); // contains Array of returned rows

Where Method

This method allows you to specify where parameters of the query.

WARNING: In order to use column to column comparisons only raw where conditions should be used as column name or functions cant 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';

Regular == operator with column to column comparison:

// WRONG
$db->where ('lastLogin', 'createdAt');
// CORRECT
$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;

BETWEEN / NOT BETWEEN:

$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

IN / NOT IN:

$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');

OR CASE

$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, '<=>');
$results = $db->get("users");
// Gives: SELECT * FROM users where lastName <=> NULL

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);
// GIVES: INSERT LOW_PRIORITY INTO table ...

$db->setQueryOption ('FOR UPDATE')->get ('users');
// GIVES: SELECT * FROM USERS FOR UPDATE;

Also you can use an array of keywords:

$db->setQueryOption (Array('LOW_PRIORITY', 'IGNORE'))->insert ($table,$param);
// GIVES: INSERT LOW_PRIORITY IGNORE INTO table ...

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

$db->setQueryOption ('SQL_NO_CACHE');
$db->get("users");
// GIVES: SELECT SQL_NO_CACHE * FROM USERS;

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

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

Delete Query

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

Ordering method

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

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

Grouping method

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

Join table products with table users with LEFT JOIN by tenantID

JOIN method

$db->join("users u", "p.tenantID=u.tenantID", "LEFT");
$db->where("u.id", 6);
$products = $db->get ("products p", null, "u.name, p.productName");
print_r ($products);

Properties sharing

Its 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 users where agentId = 10 and active = 1

Subqueries

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, "p.userId=u.id", "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 p.userId=u.id;

###EXISTS / NOT EXISTS condition

$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 commands

Reconnect in case mysql connection died:

if (!$db->ping())
    $db->connect()

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

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

Check if table exists:

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

Transaction helpers

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

$db->startTransaction();
...
if (!$db->insert ('myTable', $insertData)) {
    //Error while saving, cancel new record
    $db->rollback();
} else {
    //OK
    $db->commit();
}

Query exectution 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']);
$db->get("users");
$db->get("test");
print_r ($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
        )

Name		Name	Last commit message	Last commit date
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tests		tests
.gitattributes		.gitattributes
.gitignore		.gitignore
LICENSE		LICENSE
MysqliDb.php		MysqliDb.php
composer.json		composer.json
dbObject.md		dbObject.md
dbObject.php		dbObject.php
index.php		index.php
readme.md		readme.md

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