phossa-db

, _(*1)

Introduction

phossa-db is a PHP db connection management library which handles the interaction with db., _(*2)

It requires PHP 5.4 and supports PHP 7.0+, HHVM. It is compliant with PSR-1, PSR-2, PSR-4., _(*3)

Features

Simple interface. Nothing you don't need., _(*4)
Multiple db platform/driver support, currently PDO (all PDO drivers) and Mysqli., _(*5)
Handles multiple connections through driver manager, _(*6)
- Round-robin load balancing
Multiple db connections are used in round-robin fashion and weighting factor (1-10) supported. Each connection is monitored (pinged)., _(*7)
- driver tagging, so user can tag different db connection as 'reader' or 'writer'
Easy profiling, get each executed sql and its execution time., _(*8)
Secure. All SQL executed through prepare/execute in low-level drivers., _(*9)

Getting started

Installation, _(*10)

Install via the composer utility., _(*11)
```
composer require "phossa/phossa-db=1.*"
```
or add the following lines to your composer.json, _(*12)
```
{
  "require": {
    "phossa/phossa-db": "1.*"
  }
}
```

Usage

Driver, _(*13)

DDL using execute()

$db = new Phossa\Db\Pdo\Driver([
    'dsn' => 'mysql:dbname=test;host=127.0.0.1;charset=utf8'
]);

// simple delete
$res = $db->execute("DELETE FROM test WHERE id < 10");
if (false === $res) {
    echo $db->getError() . \PHP_EOL;
} else {
    echo sprintf("Deleted %d records", $res) . \PHP_EOL;
}

// with parameters
$res = $db->execute("INSERT INTO test (name) VALUES (?)", [ 100 ]);
if ($res) {
    $id = (int) $db->getLastInsertId();
}

SELECT using query()

// simple select
$res = $db->query("SELECT * FROM test WHERE id < 10");
if (false === $res) {
    echo $db->getError() . \PHP_EOL;
} else {
    $rows = $res->fetchAll();
}

// with parameters & fetch first 5 rows
$res = $db->query("SELECT * FROM test WHERE id > ? LIMIT ?", [10, 20]);
if ($res && $res->isQuery()) {
    $firstFiveRows = $res->fetchRow(5);
}

// fetch first field
$res = $db->query("SELECT id, name FROM test WHERE id < :id", ['id' => 10]);
if ($res && $res->isQuery()) {
    $firstCols = $res->fetchCol('id');
}

Statment, _(*14)

Statement is returned by $db->prepare()., _(*15)

// PREPARE using prepare()
$stmt = $db->prepare("SELECT * FROM test WHERE id < :id");
if (false === $stmt) {
  echo $db->getError() . \PHP_EOL;
} else {
  $res = $stmt->execute(['id' => 10]);
  if (false === $res) {
     echo $db->getError() . \PHP_EOL;
  } else {
     $rows = $res->fetchAll();
  }
}

Result, _(*16)

Result is returned by $db->execute(), $db->query() or $stmt->execute(), _(*17)

$res = $db->query(...);
if ($res) {
  // SELECT
  if ($res->isQuery()) {
      // get fields count
      $fieldCount = $res->fieldCount();
      // row count
      $rowCount   = $res->rowCount();

  // DDL
  } else {
      $affectedRows = $res->affectedRows();
  }
}

Driver manager

Driver manager manages multiple db connections. Weighting factor N means add one driver virtually N times. Adding driver A with factor 5 and adding driver B with factor 1 into the pool, means when calling getDriver(), user will get A five times vs B for one time., _(*18)

// writable connect 1
$db1 = (new Phossa\Db\Pdo\Driver($conf1))->addTag('RW');

// dbreader 2
$db2 = (new Phossa\Db\Pdo\Driver($conf2))->addTag('RO');

// dbreader 3
$db3 = (new Phossa\Db\Pdo\Driver($conf3))->addTag('RO');

// db manager
$dbm = (new Phossa\Db\Manager\Manager())
    ->addDriver($db1, 1)    // writable connection with factor 1
    ->addDriver($db2, 5)    // read_only, factor 5
    ->addDriver($db3, 5)    // read_only, factor 5

// get a db connect, no matter writable or read only
$db = $dbm->getDriver();

// get a readonly driver
$db = $dbm->getDriver('RO');

SQL profiling

Get the executed SQL and its execution time., _(*19)

// init driver
$db = new Phossa\Db\Pdo\Driver($conf);

// enable profiling
$db->enableProfiling();

// execute a DELETE
$db->execute("DELETE FROM test WHERE test_id > 10");

// get sql
$sql  = $db->getProfiler()->getSql();
$time = $db->getProfiler()->getExecutionTime();