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README.md

Documentation

NOTE: All exceptions thrown by Simple PDO extend Bayfront\SimplePdo\Exceptions\SimplePDOException, so you can choose to catch exceptions as narrowly or broadly as you like.

Whether using the Simple PDO Db class, or the query builder's Query class, a PDO instance is required.

For more information on creating a PDO instance, see PDO.

Query builder

Simple PDO includes a helpful query builder which you may choose to utilize. For more information, see query builder.

Simple PDO

First, see getting started to create a Simple PDO Db instance. Once an instance is created, you can begin using Simple PDO.

Public methods

Database connections

Queries

Query information

addConnection

Description:

Add a PDO instance.

Parameters:

  • $pdo (PDO)
  • $db_name (string): Name must be unique
  • $make_current = false (bool): Use this connection for all subsequent queries

Returns:

  • (self)

Throws:

  • Bayfront\SimplePdo\Exceptions\InvalidDatabaseException

Example:

try {

    $db->addConnection($pdo, 'backup'); // Assuming $pdo is a PDO instance

} catch (InvalidDatabaseException $e) {
    echo $e->getMessage();
}

useConnection

Description:

Use a given database connection for all subsequent queries.

Parameters:

  • $db_name (string)

Returns:

  • (self)

Throws:

  • Bayfront\SimplePdo\Exceptions\InvalidDatabaseException

Example:

try {

    $db->useConnection('backup');

} catch (InvalidDatabaseException $e) {
    echo $e->getMessage();
}

getConnection

Description:

Returns the raw PDO instance of a given database.

Parameters:

  • $db_name = '' (string): Leaving this parameter blank will return the PDO instance of the current database

Returns:

  • (PDO)

Throws:

  • Bayfront\SimplePdo\Exceptions\InvalidDatabaseException

Example:

try {

    $pdo = $db->getConnection('backup');

} catch (InvalidDatabaseException $e) {
    echo $e->getMessage();
}

getCurrentConnection

Description:

Returns the raw PDO instance of the current database.

Parameters:

  • None

Returns:

  • (PDO)

Example:

$pdo = $db->getCurrentConnection();

getCurrentConnectionName

Description:

Returns name of the current database connection.

Parameters:

  • None

Returns:

  • (string)

Example:

echo $db->getCurrentConnectionName();

getConnectionNames

Description:

Returns array of all database connection names.

Parameters:

  • None

Returns:

  • (array)

Example:

print_r($db->getConnectionNames());

connectionExists

Description:

Checks if a database connection exists with a given name.

Parameters:

  • $db_name (string)

Returns:

  • (bool)

Example:

if ($db->connectionExists('backup')) {
    // Do something
}

query

Description:

Execute a query.

Parameters:

  • $query (string)
  • $params = [] (array)

Returns:

  • (bool)

Example:

$db->query("INSERT INTO items (name, description, color, quantity, price) VALUES (:name, :description, :color, :quantity, :price)", [
        'name' => 'Sample item',
        'description' => 'Sample item description',
        'color' => 'blue',
        'quantity' => 5,
        'price' => 49.99
    ]);

select

Description:

Returns the result set from a table, or false on failure.

Parameters:

  • $query (string)
  • $params = [] (array)
  • $return_array = true (bool): When false, the result set will be returned as an object

Returns:

  • (mixed)

Example:

$results = $db->select("SELECT * FROM items WHERE price > :min_price", [
    'min_price' => 20
]);

row

Description:

Returns a single row from a table, or false on failure.

Parameters:

  • $query (string)
  • $params = [] (array)
  • $return_array = true (bool): When false, the result set will be returned as an object

Returns:

  • (mixed)

Example:

$result = $db->row("SELECT * FROM items WHERE id = :id", [
    'id' => 1
]);

single

Description:

Returns a single column from a single row of a table, or false if not existing.

Parameters:

  • $query (string)
  • $params = [] (array)

Returns:

  • (mixed)

Example:

$result = $db->single("SELECT description FROM items WHERE id = :id", [
    'id' => 1
]);

insert

Description:

Inserts a new row.

Parameters:

  • $table (string)
  • $values (array)
  • $overwrite = true (bool): Overwrite preexisting values if they exist

Returns:

  • (bool)

Example:

$db->insert('items', [
    'name' => 'Some new item',
    'description' => 'A description of the item',
    'color' => 'red',
    'quantity' => 3,
    'price' => 99.99
]);

update

Description:

Updates an existing row.

Parameters:

  • $table (string)
  • $values (array)
  • $conditions (array): Where key = value

Returns:

  • (bool)

Example:

$db->update('items', [
    'price' => 89.99
], [
    'id' => 2
]);

delete

Description:

Deletes row(s).

NOTE: Leaving the $conditions array empty will delete all rows of the table, so use with caution!

Parameters:

  • $table (string)
  • $conditions (array): Where key = value

Returns:

  • (bool)

Example:

$db->delete('items', [
    'id' => 2
]);

count

Description:

Returns number of rows in a table that matches given conditions.

Parameters:

  • $table (string)
  • $conditions = [] (array): Where key = value

Returns:

  • (int)

Example:

$count = $db->count('items', [
    'color' => 'blue'
]);

exists

Description:

Checks if rows exist in a table that matches given conditions.

Parameters:

  • $table (string)
  • $conditions = [] (array): Where key = value

Returns:

  • (bool)

Example:

$exists = $db->exists('items', [
    'color' => 'blue'
]);

sum

Description:

Returns sum of column in a table that matches given conditions.

Parameters:

  • $table (string)
  • $column (string)
  • $conditions = [] (array)

Returns:

  • (int)

Example:

$sum = $db->sum('items', 'quantity', [
    'color' => 'blue'
]);

beginTransaction

Description:

Begins a transaction.

Once a transaction has begun, all database modifications across multiple queries will be rolled back if any fail, or if cancelled by calling rollbackTransaction().

Parameters:

  • None

Returns:

  • (bool)

Example:

$db->beginTransaction();
    
// Multiple queries occur here
    
$db->commitTransaction();

commitTransaction

Description:

Commits a transaction.

Parameters:

  • None

Returns:

  • (bool)

rollbackTransaction

Description:

Cancels a transaction which has begun, and rolls back any modifications since the transaction began.

Parameters:

  • None

Returns:

  • (bool)

getLastQuery

Description:

Returns last raw query.

Parameters:

  • None

Returns:

  • (string)

Example:

echo $db->getLastQuery();

getLastParameters

Description:

Returns last query parameters.

Parameters:

  • None

Returns:

  • (array)

Example:

print_r($db->getLastParameters();

rowCount

Description:

Returns the number of rows affected by the last statement.

Parameters:

  • None

Returns:

  • (int)

Example:

echo $db->rowCount();

lastInsertId

Description:

Returns the ID of the last inserted row.

Parameters:

  • None

Returns:

  • (string)

Example:

echo $db->lastInsertId();

setQueryTime

Description:

Add a query time to be tracked using getQueryTime and getTotalQueries. This is helpful to track queries using the query builder.

Parameters:

  • $db_name (string)
  • $duration = 0 (float): Microseconds as float

Returns:

  • (void)

Example:

$start_time = microtime(true);

// Perform a query outside the Db class

$db->setQueryTime('backup', microtime(true) - $start_time);

getQueryTime

Description:

Returns the total time elapsed in seconds for all queries executed for a given database.

Parameters:

  • $decimals = 3 (int): Number of decimal points to return
  • $db_name = '' (string): Leaving this parameter blank will return the time elapsed for all database connections

Returns:

  • (float)

Example:

echo $db->getQueryTime();

getTotalQueries

Description:

Returns the total number of queries executed for a given database.

Parameters:

  • $db_name = '' (string): Leaving this parameter blank will return the total queries for all database connections

Returns:

  • (int)

Example:

echo $db->getTotalQueries();