MysqliDb -- Simple MySQLi wrapper and object mapper with prepared statements
<hr>
### 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)**
**[Insert Data](#insert-data)**
**[Insert XML](#insert-xml)**
**[Pagination](#pagination)**
**[Running raw SQL queries](#running-raw-sql-queries)**
**[Query Keywords](#query-keywords)**
**[Where Conditions](#where--having-methods)**
**[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 Methods](#helper-methods)**
**[Transaction Helpers](#transaction-helpers)**
**[Error Helpers](#error-helpers)**
**[Table Locking](#table-locking)**
## Support Me
This software is developed during my free time and I will be glad if somebody will support me.
Everyone's time should be valuable, so please consider donating.
[Donate with paypal](https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=a%2ebutenka%40gmail%2ecom&lc=DO&item_name=mysqlidb¤cy_code=USD&bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHosted)
### Installation
To utilize this class, first import MysqliDb.php into your project, and require it.
```php
require_once ('MysqliDb.php');
```
### Installation with composer
It is also possible to install library via composer
```
composer require thingengineer/mysqli-database-class:dev-master
```
### Initialization
Simple initialization with utf8 charset set by default:
```php
$db = new MysqliDb ('host', 'username', 'password', 'databaseName');
```
Advanced initialization:
```php
$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:
```php
$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:
```php
$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
```php
$db->autoReconnect = false;
```
If you need to get already created mysqliDb object from another class or function use
```php
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:
```php
$db->addConnection('slave', Array (
'host' => 'host',
'username' => 'username',
'password' => 'password',
'db'=> 'databaseName',
'port' => 3306,
'prefix' => 'my_',
'charset' => 'utf8')
);
```
To select database use connection() method
```php
$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 <a href='dbObject.md'>dbObject manual for more information</a>
### Insert Query
Simple example
```php
$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
```php
$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
```php
$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
```php
$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
```php
$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
<a href='https://dev.mysql.com/doc/refman/5.0/en/replace.html'>Replace()</a> method implements same API as insert();
### Update Query
```php
$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();
```
`update()` also support limit parameter:
```php
$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
```php
$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
```php
$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
```php
$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
```php
$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;
```
### Insert Data
You can also load .CSV or .XML data into a specific table.
To insert .csv data, use the following syntax:
```php
$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:
```php
Array(
"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
```php
$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**:
```php
$options = Array("fieldChar" => ';', "lineChar" => '\r\n', "linesToIgnore" => 1, "loadDataLocal" => true);
$db->loadData("users", "/home/john/file.csv", $options);
// LOAD DATA LOCAL ...
```
### Insert XML
To load XML data into a table, you can use the method **loadXML**.
The syntax is smillar to the loadData syntax.
```php
$path_to_file = "/home/john/file.xml";
$db->loadXML("users", $path_to_file);
```
You can also add optional parameters.
Valid parameters:
```php
Array(
"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
)
```
Usage:
```php
$options = Array("linesToIgnore" => 0, "rowTag" => "<user>"):
$path_to_file = "/home/john/file.xml";
$db->loadXML("users", $path_to_file, $options);
```
### Pagination
Use paginate() instead of get() to fetch paginated result
```php
$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.
```php
$user = $db->map ('login')->ObjectBuilder()->getOne ('users', 'login, id');
Array
(
[user1] => 1
)
$user = $db->map ('login')->ObjectBuilder()->getOne ('users', 'id,login,createdAt');
Array
(
[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
```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
```php
$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:
```php
$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:
```php
$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:
```php
$logins = $db->rawQueryValue ('select login from users limit 10');
foreach ($logins as $login)
echo $login;
```
More advanced examples:
```php
$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 / 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 cant be passed as a bind variable.
Regular == operator with variables:
```php
$db->where ('id', 1);
$db->where ('login', 'admin');
$results = $db->get ('users');
// Gives: SELECT * FROM users WHERE id=1 AND login='admin';
```
```php
$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:
```php
// WRONG
$db->where ('lastLogin', 'createdAt');
// CORRECT
$db->where ('lastLogin = createdAt');
$results = $db->get ('users');
// Gives: SELECT * FROM users WHERE lastLogin = createdAt;
```
```php
$db->where ('id', 50, ">=");
// or $db->where ('id', Array ('>=' => 50));
$results = $db->get ('users');
// Gives: SELECT * FROM users WHERE id >= 50;
```
BETWEEN / NOT BETWEEN:
```php
$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:
```php
$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:
```php
$db->where ('firstName', 'John');
$db->orWhere ('firstName', 'Peter');
$results = $db->get ('users');
// Gives: SELECT * FROM users WHERE firstName='John' OR firstName='peter'
```
NULL comparison:
```php
$db->where ("lastName", NULL, 'IS NOT');
$results = $db->get("users");
// Gives: SELECT * FROM users where lastName IS NOT NULL
```
LIKE comparison:
```php
$db->where ("fullName", 'John%', 'like');
$results = $db->get("users");
// Gives: SELECT * FROM users where fullName like 'John%'
```
Also you can use raw where conditions:
```php
$db->where ("id != companyId");
$db->where ("DATE(createdAt) = DATE(lastLogin)");
$results = $db->get("users");
```
Or raw condition with variables:
```php
$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:
```php
$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 ():
```php
$db->setQueryOption ('LOW_PRIORITY')->insert ($table, $param);
// GIVES: INSERT LOW_PRIORITY INTO table ...
```
```php
$db->setQueryOption ('FOR UPDATE')->get ('users');
// GIVES: SELECT * FROM USERS FOR UPDATE;
```
Also you can use an array of keywords:
```php
$db->setQueryOption (Array('LOW_PRIORITY', 'IGNORE'))->insert ($table,$param);
// GIVES: INSERT LOW_PRIORITY IGNORE INTO table ...
```
Same way keywords could be used in SELECT queries as well:
```php
$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 and over:
```php
$results = $db
->where('id', 1)
->where('login', 'admin')
->get('users');
```
### Delete Query
```php
$db->where('id', 1);
if($db->delete('users')) echo 'successfully deleted';
```
### Ordering method
```php
$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:
```php
$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 ``.
```php
$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
```php
$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
```php
$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);
```
### Join Conditions
Add AND condition to join statement
```php
$db->join("users u", "p.tenantID=u.tenantID", "LEFT");
$db->joinWhere("users u", "u.tenantID", 5);
$products = $db->get ("products p", null, "u.name, p.productName");
print_r ($products);
// Gives: SELECT u.login, p.productName FROM products p LEFT JOIN users u ON (p.tenantID=u.tenantID AND u.tenantID = 5)
```
Add OR condition to join statement
```php
$db->join("users u", "p.tenantID=u.tenantID", "LEFT");
$db->joinOrWhere("users u", "u.tenantID", 5);
$products = $db->get ("products p", null, "u.name, p.productName");
print_r ($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
```php
$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)
```php
$sq = $db->subQuery();
$sq->get ("users");
```
A subquery with an alias specified to use in JOINs . Eg. (select * from users) sq
```php
$sq = $db->subQuery("sq");
$sq->get ("users");
```
Subquery in selects:
```php
$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:
```php
$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:
```php
$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
```php
$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.
```php
$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:
```php
$db->disconnect();
```
Reconnect in case mysql connection died:
```php
if (!$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.
```php
$db->get('users');
echo "Last executed query was ". $db->getLastQuery();
```
Check if table exists:
```php
if ($db->tableExists ('users'))
echo "hooray";
```
mysqli_real_escape_string() wrapper:
```php
$escaped = $db->escape ("' and 1=1");
```
### Transaction helpers
Please keep in mind that transactions are working on innoDB tables.
Rollback transaction if insert fails:
```php
$db->startTransaction();
...
if (!$db->insert ('myTable', $insertData)) {
//Error while saving, cancel new record
$db->rollback();
} else {
//OK
$db->commit();
}
```
### 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.
```php
$db->where('login', 'admin')->update('users', ['firstName' => 'Jack']);
if ($db->getLastErrno() === 0)
echo 'Update succesfull';
else
echo 'Update failed. Error: '. $db->getLastError();
```
### Query execution time benchmarking
To track query execution time setTrace() function should be called.
```php
$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
)
```
### 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.
```php
$db->setLockMethod("WRITE")->lock("users");
```
Calling another **->lock()** will remove the first lock.
You can also use
```php
$db->unlock();
```
to unlock the previous locked tables.
To lock multiple tables, you can use an array.
Example:
```php
$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!