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mikecao/sparrow

mikecao/sparrow

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Last Updated: 2021-07-02 07:18:14

#php #database #sql #orm #abstraction #library

A simple database toolkit for PHP

License: MIT License

Languages: PHP

Sparrow

Sparrow is a simple but powerful database toolkit. Sparrow is a fluent SQL builder, database abstraction layer, cache manager, query statistics generator, and micro-ORM all rolled into a single class file.

Building SQL

// Include the library
include '/path/to/sparrow.php';

// Declare the class instance
$db = new Sparrow();

// Select a table
$db->from('user');

// Build a select query
$db->select();

// Display the SQL
echo $db->sql();

Output:

SELECT * FROM user

Method Chaining

Sparrow allows you to chain methods together, so you can instead do:

echo $db->from('user')->select()->sql();

Where Conditions

To add where conditions to your query, use the where function.

echo $db->from('user')
    ->where('id', 123)
    ->select()
    ->sql();

Output:

SELECT * FROM user WHERE id = 123

You can call where multiple times to add multiple conditions.

echo $db->from('user')
    ->where('id', 123)
    ->where('name', 'bob')
    ->select()
    ->sql();

Output:

SELECT * FROM user WHERE id = 123 AND name = 'bob'

You can also pass an array to the where function. The following would produce the same output.

$where = array('id' => 123, 'name' => 'bob');
echo $db->from('user')
    ->where($where)
    ->select()
    ->sql();

You can even pass in a string literal.

echo $db->from('user')
    ->where('id = 99')
    ->select()
    ->sql();

Output:

SELECT * FROM user WHERE id = 99

Custom Operators

The default operator for where queries is =. You can use different operators by placing them after the field declaration.

echo $db->from('user')
    ->where('id >', 123)
    ->select()
    ->sql();

Output:

SELECT * FROM user WHERE id > 123;

OR Queries

By default where conditions are joined together by AND keywords. To use OR instead, simply place a | delimiter before the field name.

echo $db->from('user')
    ->where('id <', 10)
    ->where('|id >', 20)
    ->select()
    ->sql();

Output:

SELECT * FROM user WHERE id < 10 OR id > 20

LIKE Queries

To build a LIKE query you can use the special % operator.

echo $db->from('user')
    ->where('name %', '%bob%')
    ->select()
    ->sql();

Output:

SELECT * FROM user WHERE name LIKE '%bob%'

To build a NOT LIKE query, add a ! before the % operator.

echo $db->from('user')
    ->where('name !%', '%bob%')
    ->select()
    ->sql();

Output:

SELECT * FROM user WHERE name NOT LIKE '%bob%'

IN Queries

To use an IN statement in your where condition, use the special @ operator and pass in an array of values.

echo $db->from('user')
    ->where('id @', array(10, 20, 30))
    ->select()
    ->sql();

Output:

SELECT * FROM user WHERE id IN (10, 20, 30)

To build a NOT IN query, add a ! before the @ operator.

echo $db->from('user')
    ->where('id !@', array(10, 20, 30))
    ->select()
    ->sql();

Output:

SELECT * FROM user WHERE id NOT IN (10, 20, 30)

Selecting Fields

To select specific fields, pass an array in to the select function.

echo $db->from('user')
    ->select(array('id','name'))
    ->sql();

Output:

SELECT id, name FROM user

Limit and Offset

To add a limit or offset to a query, you can use the limit and offset functions.

echo $db->from('user')
    ->limit(10)
    ->offset(20)
    ->select()
    ->sql();

Output:

SELECT * FROM user LIMIT 10 OFFSET 20

You can also pass in additional parameters to the select function.

echo $db->from('user')
    ->select('*', 50, 10)
    ->sql();

Output:

SELECT * FROM user LIMIT 50 OFFSET 10

Distinct

To add a DISTINCT keyword to your query, call the distinct function.

echo $db->from('user')
    ->distinct()
    ->select('name')
    ->sql();

Output:

SELECT DISTINCT name FROM user

Table Joins

To add a table join, use the join function and pass in an array of fields to join on.

echo $db->from('user')
    ->join('role', array('role.id' => 'user.id'))
    ->select()
    ->sql();

Output:

SELECT * FROM user INNER JOIN role ON role.id = user.id

The default join type is an INNER join. To build other types of joins you can use the alternate join functions leftJoin, rightJoin, and fullJoin.

The join array works just like where conditions, so you can use custom operators and add multiple conditions.

echo $db->from('user')
    ->join('role', array('role.id' => 'user.id', 'role.id >' => 10))
    ->select()
    ->sql();

Output:

SELECT * FROM user INNER JOIN role ON role.id = user.id AND role.id > 10

Sorting

To add sorting to a query, use the sortAsc and sortDesc functions.

echo $db->from('user')
    ->sortDesc('id')
    ->select()
    ->sql();

Output:

SELECT * FROM user ORDER BY id DESC

You can also pass an array to the sort functions.

echo $db->from('user')
    ->sortAsc(array('rank','name'))
    ->select()
    ->sql();

Output:

SELECT * FROM user ORDER BY rank ASC, name ASC

Grouping

To add a field to group by, use the groupBy function.

echo $db->from('user')
    ->groupBy('points')
    ->select(array('id','count(*)'))
    ->sql();

Output:

SELECT id, count(*) FROM user GROUP BY points;

Insert Queries

To build an insert query, pass in an array of data to the insert function.

$data = array('id' => 123, 'name' => 'bob');

echo $db->from('user')
    ->insert($data)
    ->sql();

Output:

INSERT INTO user (id, name) VALUES (123, 'bob')

Update Queries

To build an update query, pass in an array of data to the update function.

$data = array('name' => 'bob', 'email' => '[email protected]');
$where = array('id' => 123);

echo $db->from('user')
    ->where($where)
    ->update($data)
    ->sql();

Output:

UPDATE user SET name = 'bob', email = '[email protected]' WHERE id = 123

Delete Queries

To build a delete query, use the delete function.

echo $db->from('user')
    ->where('id', 123)
    ->delete()
    ->sql();

Output:

DELETE FROM user WHERE id = 123

Executing Queries

Sparrow can also execute the queries it builds. You will need to call the setDb() method with either a connection string, an array of connection information, or a connection object.

The supported database types are mysql, mysqli, pgsql, sqlite and sqlite3.

Using a connection string:

$db->setDb('mysql://admin:hunter2@localhost/mydb');

The connection string uses the following format:

type://username:password@hostname[:port]/database

For sqlite, you need to use:

type://database

Using a connection array:

$db->setDb(array(
    'type' => 'mysql',
    'hostname' => 'localhost',
    'database' => 'mydb',
    'username' => 'admin',
    'password' => 'hunter2'
));

The possible array options are type, hostname, database, username, password, and port.

Using a connection object:

$mysql = mysql_connect('localhost', 'admin', 'hunter2');

mysql_select_db('mydb');

$db->setDb($mysql);

You can also use PDO for the database connection. To use the connection string or array method, prefix the database type with pdo:

$db->setDb('pdomysql://admin:hunter2@localhost/mydb');

The possible PDO types are pdomysql, pdopgsql, and pdosqlite.

You can also pass in any PDO object directly:

$pdo = new PDO('mysql:host=localhost;dbname=mydb', 'admin', 'hunter2');

$db->setDb($pdo);

Fetching records

To fetch multiple records, use the many function.

$rows = $db->from('user')
    ->where('id >', 100)
    ->many();

The result returned is an array of associative arrays:

array(
    array('id' => 101, 'name' => 'joe'),
    array('id' => 102, 'name' => 'ted');
)

To fetch a single record, use the one function.

$row = $db->from('user')
    ->where('id', 123)
    ->one();

The result returned is a single associative array:

array('id' => 123, 'name' => 'bob')

To fetch the value of a column, use the value function and pass in the name of the column.

$username = $db->from('user')
    ->where('id', 123)
    ->value('username');

All the fetch functions automatically perform a select, so you don't need to include the select function unless you want to specify the fields to return.

$row = $db->from('user')
    ->where('id', 123)
    ->select(array('id', 'name'))
    ->one();

Non-queries

For non-queries like update, insert and delete, use the execute function after building your query.

$db->from('user')
    ->where('id', 123)
    ->delete()
    ->execute();

Executes:

DELETE FROM user WHERE id = 123

Custom Queries

You can also run raw SQL by passing it to the sql function.

$posts = $db->sql('SELECT * FROM posts')->many();

$user = $db->sql('SELECT * FROM user WHERE id = 123')->one();

$db->sql('UPDATE user SET name = 'bob' WHERE id = 1')->execute();

Escaping Values

Sparrow's SQL building functions automatically quote and escape values to prevent SQL injection. To quote and escape values manually, like when you're writing own queries, you can use the quote function.

$name = "O'Dell";

printf("SELECT * FROM user WHERE name = %s", $db->quote($name));

Output:

SELECT * FROM user WHERE name = 'O\'Dell'

Query Properties

After executing a query, several property values will be populated which you can access directly.

// Last query executed
$db->last_query;

// Number of rows returned
$db->num_rows;

// Last insert id
$db->insert_id;

// Number of affected rows
$db->affected_rows;

These values are reset every time a new query is executed.

Helper Methods

To get a count of rows in a table.

$count = $db->from('user')->count();

To get the minimum value from a table.

$min = $db->from('employee')->min('salary');

To get the maximum value from a table.

$max = $db->from('employee')->max('salary');

To get the average value from a table.

$avg = $db->from('employee')->avg('salary');

To get the sum value from a table.

$avg = $db->from('employee')->sum('salary');

Direct Access

You can also access the database object directly by using the getDb function.

$mysql = $db->getDb();

mysql_info($mysql);

Caching

To enable caching, you need to use the setCache method with a connection string or connection object.

Using a connection string:

$db->setCache('memcache://localhost:11211');

Using a cache object:

$cache = new Memcache();
$cache->addServer('localhost', 11211);

$db->setCache($cache);

You can then pass a cache key to the query functions and Sparrow will try to fetch from the cache before executing the query. If there is a cache miss, Sparrow will execute the query and store the results using the specified cache key.

$key = 'all_users';

$users = $db->from('user')->many($key);

Cache Types

The supported caches are memcache, memcached, apc, xcache, file and memory.

To use memcache or memcached, you need to use the following connection string:

protocol://hostname:port

To use apc or xcache, just pass in the cache name:

$db->setCache('apc');

To use the filesystem as a cache, pass in a directory path:

$db->setCache('/usr/local/cache');

$db->setCache('./cache');

Note that local directories must be prefixed with ./.

The default cache is memory and only lasts the duration of the script.

Cache Expiration

To cache data only for a set period of time, you can pass in an additional parameter which represents the expiraton time in seconds.

$key = 'top_users';
$expire = 600;

$users = $db->from('user')
    ->sortDesc('score')
    ->limit(100)
    ->many($key, $expire);

In the above example, we are getting a list of the top 100 highest scoring users and caching it for 600 seconds (10 minutes). You can pass the expiration parameter to any of the query methods that take a cache key parameter.

Direct Access

You can access the cache object directly by using the getCache function.

$memcache = $db->getCache();

echo $memcache->getVersion();

You can manipulate the cache data directly as well. To cache a value use the store function.

$db->store('id', 123);

To retrieve a cached value use the fetch function.

$id = $db->fetch('id');

To delete a cached value use the clear function.

$db->clear('id');

To completely empty the cache use the flush function.

$db->flush();

Using Objects

Sparrow also provides some functionality for working with objects. Just define a class with public properties to represent database fields and static variables to describe the database relationship.

class User {
    // Class properties
    public $id;
    public $name;
    public $email;

    // Class configuration
    static $table = 'user';
    static $id_field = 'id';
    static $name_field = 'name';
}

Class Configuration

  • The table property represents the database table. This property is required.
  • The id_field property represents the auto-incrementing identity field in the table. This property is required for saving and deleting records.
  • The name_field property is used for finding records by name. This property is optional.

Loading Objects

To define the object use the using function and pass in the class name.

$db->using('User');

After setting your object, you can then use the find method to populate the object. If you pass in an int Sparrow will search using the id field.

$user = $db->find(123);

This will execute:

SELECT * FROM user WHERE id = 123

If you pass in a string Sparrow will search using the name field.

$user = $db->find('Bob');

This will execute:

SELECT * FROM user WHERE name = 'Bob';

If you pass in an array Sparrow will use the fields specified in the array.

$user = $db->find(
    array('email' => '[email protected]')
);

This will execute:

SELECT * FROM user WHERE email = '[email protected]'

If the find method retrieves multiple records, it will return an array of objects instead of a single object.

Saving Objects

To save an object, just populate your object properties and use the save function.

$user = new User();
$user->name = 'Bob';
$user->email = '[email protected]';

$db->save($user);

This will execute:

INSERT INTO user (name, email) VALUES ('Bob', '[email protected]')

To update an object, use the save function with the id_field property populated.

$user = new User();
$user->id = 123;
$user->name = 'Bob';
$user->email = '[email protected]';

$db->save($user);

This will execute:

UPDATE user SET name = 'Bob', email = '[email protected]' WHERE id = 123

To update an existing record, just fetch an object from the database, update its properties, then save it.

// Fetch an object from the database
$user = $db->find(123);

// Update the object
$user->name = 'Fred';

// Update the database
$db->save($user);

By default, all of the object's properties will be included in the update. To specify only specific fields, pass in an additional array of fields to the save function.

$db->save($user, array('email'));

This will execute:

UPDATE user SET email = '[email protected]' WHERE id = 123

Deleting Objects

To delete an object, use the remove function.

$user = $db->find(123);

$db->remove($user);

Advanced Finding

You can use the sql builder functions to further define criteria for loading objects.

$db->using('User')
    ->where('id >', 10)
    ->sortAsc('name')
    ->find();

This will execute:

SELECT * FROM user WHERE id > 10 ORDER BY name ASC

You can also pass in raw SQL to load your objects.

$db->using('User')
    ->sql('SELECT * FROM user WHERE id > 10')
    ->find();

Statistics

Sparrow has built in query statistics tracking. To enable it, just set the stats_enabled property.

$db->stats_enabled = true;

After running your queries, get the stats array:

$stats = $db->getStats();

The stats array contains the total time for all queries and an array of all queries executed with individual query times.

array(6) {
  ["queries"]=>
  array(2) {
    [0]=>
    array(4) {
      ["query"]=>
          string(38) "SELECT * FROM user WHERE uid=1"
      ["time"]=>
          float(0.00016617774963379)
      ["rows"]=>
          int(1)
      ["changes"]=>
          int(0)
    }
    [1]=>
    array(4) {
      ["query"]=>
          string(39) "SELECT * FROM user WHERE uid=10"
      ["time"]=>
          float(0.00026392936706543)
      ["rows"]=>
          int(0)
      ["changes"]=>
          int(0)
    }
  }
  ["total_time"]=>
      float(0.00043010711669922)
  ["num_queries"]=>
      int(2)
  ["num_rows"]=>
      int(2)
  ["num_changes"]=>
      int(0)
  ["avg_query_time"]=>
      float(0.00021505355834961)
}

Debugging

When Sparrow encounters an error while executing a query, it will raise an exception with the database error message. If you want to display the generated SQL along with the error message, set the show_sql property.

$db->show_sql = true;

Requirements

Sparrow requires PHP 5.1 or greater.

License

Sparrow is released under the MIT license.

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