Database_PDO | Kohana User Guide

public __construct( ) (defined in Kohana_Database_PDO)

Stores the database configuration locally and name the instance.

This method cannot be accessed directly, you must use Database::instance.

Return Values

void

Source Code

public function __construct($name, array $config)
{
    parent::__construct($name, $config);

    if (isset($this->_config['identifier'])) {
        // Allow the identifier to be overloaded per-connection
        $this->_identifier = (string) $this->_config['identifier'];
    }
}

public begin( [ string $mode = NULL ] ) (defined in Kohana_Database_PDO)

Start a SQL transaction

// Start the transactions
$db->begin();

try {
     DB::insert('users')->values($user1)...
     DB::insert('users')->values($user2)...
     // Insert successful commit the changes
     $db->commit();
}
catch (Database_Exception $e)
{
     // Insert failed. Rolling back changes...
     $db->rollback();
 }

Parameters

string $mode = NULL - Transaction mode

Return Values

boolean

Source Code

public function begin($mode = null)
{
    // Make sure the database is connected
    $this->_connection or $this->connect();

    return $this->_connection->beginTransaction();
}

public commit( ) (defined in Kohana_Database_PDO)

Commit the current transaction

// Commit the database changes
$db->commit();

Return Values

boolean

Source Code

public function commit()
{
    // Make sure the database is connected
    $this->_connection or $this->connect();

    return $this->_connection->commit();
}

public connect( ) (defined in Kohana_Database_PDO)

Connect to the database. This is called automatically when the first query is executed.

$db->connect();

Tags

Throws - Database_Exception

Return Values

void

Source Code

public function connect()
{
    if ($this->_connection)
        return;

    // Extract the connection parameters, adding required variabels
    extract($this->_config['connection'] + [
        'dsn' => '',
        'username' => null,
        'password' => null,
        'persistent' => false,
    ]);

    // Clear the connection parameters for security
    unset($this->_config['connection']);

    // Force PDO to use exceptions for all errors
    $options[PDO::ATTR_ERRMODE] = PDO::ERRMODE_EXCEPTION;

    if (!empty($persistent)) {
        // Make the connection persistent
        $options[PDO::ATTR_PERSISTENT] = true;
    }

    try {
        // Create a new PDO connection
        $this->_connection = new PDO($dsn, $username, $password, $options);
    } catch (PDOException $e) {
        throw new Database_Exception(':error', [':error' => $e->getMessage()], $e->getCode());
    }

    if (!empty($this->_config['charset'])) {
        // Set the character set
        $this->set_charset($this->_config['charset']);
    }
}

public create_aggregate( string $name , callback $step , callback $final [, integer $arguments = integer -1 ] ) (defined in Kohana_Database_PDO)

Create or redefine a SQL aggregate function.

Works only with SQLite

Parameters

string $name required - Name of the SQL function to be created or redefined
callback $step required - Called for each row of a result set
callback $final required - Called after all rows of a result set have been processed
integer $arguments = integer -1 - Number of arguments that the SQL function takes

Tags

Link -

Return Values

boolean

Source Code

public function create_aggregate($name, $step, $final, $arguments = -1)
{
    $this->_connection or $this->connect();

    return $this->_connection->sqliteCreateAggregate(
            $name, $step, $final, $arguments
    );
}

public create_function( string $name , callback $callback [, integer $arguments = integer -1 ] ) (defined in Kohana_Database_PDO)

Create or redefine a SQL function.

Works only with SQLite

Parameters

string $name required - Name of the SQL function to be created or redefined
callback $callback required - Callback which implements the SQL function
integer $arguments = integer -1 - Number of arguments that the SQL function takes

Tags

Link -

Return Values

boolean

Source Code

public function create_function($name, $callback, $arguments = -1)
{
    $this->_connection or $this->connect();

    return $this->_connection->sqliteCreateFunction(
            $name, $callback, $arguments
    );
}

public disconnect( ) (defined in Kohana_Database_PDO)

Disconnect from the database. This is called automatically by Database::__destruct. Clears the database instance from Database::$instances.

$db->disconnect();

Return Values

boolean

Source Code

public function disconnect()
{
    // Destroy the PDO object
    $this->_connection = null;

    return parent::disconnect();
}

public escape( string $value ) (defined in Kohana_Database_PDO)

Sanitize a string by escaping characters that could cause an SQL injection attack.

$value = $db->escape('any string');

Parameters

string $value required - Value to quote

Return Values

string

Source Code

public function escape($value)
{
    // Make sure the database is connected
    $this->_connection or $this->connect();

    return $this->_connection->quote($value);
}

public list_columns( string $table [, string $like = NULL , boolean $add_prefix = bool TRUE ] ) (defined in Kohana_Database_PDO)

Lists all of the columns in a table. Optionally, a LIKE string can be used to search for specific fields.

// Get all columns from the "users" table
$columns = $db->list_columns('users');

// Get all name-related columns
$columns = $db->list_columns('users', '%name%');

// Get the columns from a table that doesn't use the table prefix
$columns = $db->list_columns('users', null, false);

Parameters

string $table required - Table to get columns from
string $like = NULL - Column to search for
boolean $add_prefix = bool TRUE - Whether to add the table prefix automatically or not

Return Values

array

Source Code

public function list_columns($table, $like = null, $add_prefix = true)
{
    throw new Kohana_Exception('Database method :method is not supported by :class', [':method' => __FUNCTION__, ':class' => __CLASS__]);
}

public list_tables( [ string $like = NULL ] ) (defined in Kohana_Database_PDO)

List all of the tables in the database. Optionally, a LIKE string can be used to search for specific tables.

// Get all tables in the current database
$tables = $db->list_tables();

// Get all user-related tables
$tables = $db->list_tables('user%');

Parameters

string $like = NULL - Table to search for

Return Values

array

Source Code

public function list_tables($like = null)
{
    throw new Kohana_Exception('Database method :method is not supported by :class', [':method' => __FUNCTION__, ':class' => __CLASS__]);
}

public query( integer $type , string $sql [, mixed $as_object = bool FALSE , array $params = NULL ] ) (defined in Kohana_Database_PDO)

Perform an SQL query of the given type.

// Make a SELECT query and use objects for results
$db->query(Database::SELECT, 'SELECT * FROM groups', true);

// Make a SELECT query and use "Model_User" for the results
$db->query(Database::SELECT, 'SELECT * FROM users LIMIT 1', 'Model_User');

Parameters

integer $type required - Database::SELECT, Database::INSERT, etc
string $sql required - SQL query
mixed $as_object = bool FALSE - Result object class string, true for stdClass, false for assoc array
array $params = NULL - Object construct parameters for result class

Return Values

object - Database_Result for SELECT queries
array - List (insert id, row count) for INSERT queries
integer - Number of affected rows for all other queries

Source Code

public function query($type, $sql, $as_object = false, array $params = null)
{
    // Make sure the database is connected
    $this->_connection or $this->connect();

    if (Kohana::$profiling) {
        // Benchmark this query for the current instance
        $benchmark = Profiler::start("Database ({$this->_instance})", $sql);
    }

    try {
        $result = $this->_connection->query($sql);
    } catch (Exception $e) {
        if (isset($benchmark)) {
            // This benchmark is worthless
            Profiler::delete($benchmark);
        }

        // Convert the exception in a database exception
        throw new Database_Exception(':error [ :query ]', [
        ':error' => $e->getMessage(),
        ':query' => $sql
        ], $e->getCode());
    }

    if (isset($benchmark)) {
        Profiler::stop($benchmark);
    }

    // Set the last query
    $this->last_query = $sql;

    if ($type === Database::SELECT) {
        // Convert the result into an array, as PDOStatement::rowCount is not reliable
        if ($as_object === false) {
            $result->setFetchMode(PDO::FETCH_ASSOC);
        } elseif (is_string($as_object)) {
            $result->setFetchMode(PDO::FETCH_CLASS, $as_object, $params);
        } else {
            $result->setFetchMode(PDO::FETCH_CLASS, 'stdClass');
        }

        $result = $result->fetchAll();

        // Return an iterator of results
        return new Database_Result_Cached($result, $sql, $as_object, $params);
    } elseif ($type === Database::INSERT) {
        // Return a list of insert id and rows created
        return [
            $this->_connection->lastInsertId(),
            $result->rowCount(),
        ];
    } else {
        // Return the number of rows affected
        return $result->rowCount();
    }
}

public rollback( ) (defined in Kohana_Database_PDO)

Abort the current transaction

// Undo the changes
$db->rollback();

Return Values

boolean

Source Code

public function rollback()
{
    // Make sure the database is connected
    $this->_connection or $this->connect();

    return $this->_connection->rollBack();
}

public set_charset( string $charset ) (defined in Kohana_Database_PDO)

Set the connection character set. This is called automatically by Database::connect.

$db->set_charset('utf8');

Parameters

string $charset required - Character set name

Tags

Throws - Database_Exception

Return Values

void

Source Code

public function set_charset($charset)
{
    // Make sure the database is connected
    $this->_connection OR $this->connect();

    // This SQL-92 syntax is not supported by all drivers
    $this->_connection->exec('SET NAMES ' . $this->quote($charset));
}

public __destruct( ) (defined in Kohana_Database)

Disconnect from the database when the object is destroyed.

// Destroy the database instance
unset(Database::instances[(string) $db], $db);

Calling unset($db) is not enough to destroy the database, as it will still be stored in Database::$instances.

Return Values

void

Source Code

public function __destruct()
{
    $this->disconnect();
}

public __toString( ) (defined in Kohana_Database)

Returns the database instance name.

echo (string) $db;

Return Values

string

Source Code

public function __toString()
{
    return $this->_instance;
}

public count_records( mixed $table ) (defined in Kohana_Database)

Count the number of records in a table.

// Get the total number of records in the "users" table
$count = $db->count_records('users');

Parameters

mixed $table required - Table name string or [query, alias]

Return Values

integer

Source Code

public function count_records($table)
{
    // Quote the table name
    $table = $this->quote_table($table);

    return $this->query(Database::SELECT, 'SELECT COUNT(*) AS total_row_count FROM ' . $table, false)
            ->get('total_row_count');
}

public datatype( string $type ) (defined in Kohana_Database)

Returns a normalized array describing the SQL data type

$db->datatype('char');

Parameters

string $type required - SQL data type

Return Values

array

Source Code

public function datatype($type)
{
    static $types = [
        // SQL-92
        'bit' => ['type' => 'string', 'exact' => true],
        'bit varying' => ['type' => 'string'],
        'char' => ['type' => 'string', 'exact' => true],
        'char varying' => ['type' => 'string'],
        'character' => ['type' => 'string', 'exact' => true],
        'character varying' => ['type' => 'string'],
        'date' => ['type' => 'string'],
        'dec' => ['type' => 'float', 'exact' => true],
        'decimal' => ['type' => 'float', 'exact' => true],
        'double precision' => ['type' => 'float'],
        'float' => ['type' => 'float'],
        'int' => ['type' => 'int', 'min' => '-2147483648', 'max' => '2147483647'],
        'integer' => ['type' => 'int', 'min' => '-2147483648', 'max' => '2147483647'],
        'interval' => ['type' => 'string'],
        'national char' => ['type' => 'string', 'exact' => true],
        'national char varying' => ['type' => 'string'],
        'national character' => ['type' => 'string', 'exact' => true],
        'national character varying' => ['type' => 'string'],
        'nchar' => ['type' => 'string', 'exact' => true],
        'nchar varying' => ['type' => 'string'],
        'numeric' => ['type' => 'float', 'exact' => true],
        'real' => ['type' => 'float'],
        'smallint' => ['type' => 'int', 'min' => '-32768', 'max' => '32767'],
        'time' => ['type' => 'string'],
        'time with time zone' => ['type' => 'string'],
        'timestamp' => ['type' => 'string'],
        'timestamp with time zone' => ['type' => 'string'],
        'varchar' => ['type' => 'string'],
        // SQL:1999
        'binary large object' => ['type' => 'string', 'binary' => true],
        'blob' => ['type' => 'string', 'binary' => true],
        'boolean' => ['type' => 'bool'],
        'char large object' => ['type' => 'string'],
        'character large object' => ['type' => 'string'],
        'clob' => ['type' => 'string'],
        'national character large object' => ['type' => 'string'],
        'nchar large object' => ['type' => 'string'],
        'nclob' => ['type' => 'string'],
        'time without time zone' => ['type' => 'string'],
        'timestamp without time zone' => ['type' => 'string'],
        // SQL:2003
        'bigint' => ['type' => 'int', 'min' => '-9223372036854775808', 'max' => '9223372036854775807'],
        // SQL:2008
        'binary' => ['type' => 'string', 'binary' => true, 'exact' => true],
        'binary varying' => ['type' => 'string', 'binary' => true],
        'varbinary' => ['type' => 'string', 'binary' => true],
    ];

    if (isset($types[$type]))
        return $types[$type];

    return [];
}

public static instance( [ string $name = NULL , array $config = NULL ] ) (defined in Kohana_Database)

Get a singleton Database instance. If configuration is not specified, it will be loaded from the database configuration file using the same group as the name.

// Load the default database
$db = Database::instance();

// Create a custom configured instance
$db = Database::instance('custom', $config);

Parameters

string $name = NULL - Instance name
array $config = NULL - Configuration parameters

Return Values

Database

Source Code

public static function instance($name = null, array $config = null)
{
    if ($name === null) {
        // Use the default instance name
        $name = Database::$default;
    }

    if (!isset(Database::$instances[$name])) {
        if ($config === null) {
            // Load the configuration for this database
            $config = Kohana::$config->load('database')->$name;
        }

        if (!isset($config['type'])) {
            throw new Kohana_Exception('Database type not defined in :name configuration', [':name' => $name]);
        }

        // Set the driver class name
        $driver = 'Database_' . ucfirst($config['type']);

        // Create the database connection instance
        $driver = new $driver($name, $config);

        // Store the database instance
        Database::$instances[$name] = $driver;
    }

    return Database::$instances[$name];
}

public quote( mixed $value ) (defined in Kohana_Database)

Quote a value for an SQL query.

$db->quote(null);   // 'NULL'
$db->quote(10);     // 10
$db->quote('fred'); // 'fred'

Objects passed to this function will be converted to strings. Database_Expression objects will be compiled. Database_Query objects will be compiled and converted to a sub-query. All other objects will be converted using the __toString method.

Parameters

mixed $value required - Any value to quote

Tags

Uses - Database::escape

Return Values

string

Source Code

public function quote($value)
{
    if ($value === null) {
        return 'NULL';
    } elseif ($value === true) {
        return "'1'";
    } elseif ($value === false) {
        return "'0'";
    } elseif (is_object($value)) {
        if ($value instanceof Database_Query) {
            // Create a sub-query
            return '(' . $value->compile($this) . ')';
        } elseif ($value instanceof Database_Expression) {
            // Compile the expression
            return $value->compile($this);
        } else {
            // Convert the object to a string
            return $this->quote((string) $value);
        }
    } elseif (is_array($value)) {
        return '(' . implode(', ', array_map([$this, __FUNCTION__], $value)) . ')';
    } elseif (is_int($value)) {
        return (int) $value;
    } elseif (is_float($value)) {
        // Convert to non-locale aware float to prevent possible commas
        return sprintf('%F', $value);
    }

    return $this->escape($value);
}

public quote_column( mixed $column ) (defined in Kohana_Database)

Quote a database column name and add the table prefix if needed.

$column = $db->quote_column($column);

You can also use SQL methods within identifiers.

$column = $db->quote_column(DB::expr('COUNT(`column`)'));

Objects passed to this function will be converted to strings. Database_Expression objects will be compiled. Database_Query objects will be compiled and converted to a sub-query. All other objects will be converted using the __toString method.

Parameters

mixed $column required - Column name or [column, alias]

Tags

Uses - Database::quote_identifier, Database::table_prefix

Return Values

string

Source Code

public function quote_column($column)
{
    // Identifiers are escaped by repeating them
    $escaped_identifier = $this->_identifier . $this->_identifier;

    if (is_array($column)) {
        list($column, $alias) = $column;
        $alias = str_replace($this->_identifier, $escaped_identifier, $alias);
    }

    if ($column instanceof Database_Query) {
        // Create a sub-query
        $column = '(' . $column->compile($this) . ')';
    } elseif ($column instanceof Database_Expression) {
        // Compile the expression
        $column = $column->compile($this);
    } else {
        // Convert to a string
        $column = (string) $column;

        $column = str_replace($this->_identifier, $escaped_identifier, $column);

        if ($column === '*') {
            return $column;
        } elseif (strpos($column, '.') !== false) {
            $parts = explode('.', $column);

            if ($prefix = $this->table_prefix()) {
                // Get the offset of the table name, 2nd-to-last part
                $offset = count($parts) - 2;

                // Add the table prefix to the table name
                $parts[$offset] = $prefix . $parts[$offset];
            }

            foreach ($parts as & $part) {
                if ($part !== '*') {
                    // Quote each of the parts
                    $part = $this->_identifier . $part . $this->_identifier;
                }
            }

            $column = implode('.', $parts);
        } else {
            $column = $this->_identifier . $column . $this->_identifier;
        }
    }

    if (isset($alias)) {
        $column .= ' AS ' . $this->_identifier . $alias . $this->_identifier;
    }

    return $column;
}

public quote_identifier( mixed $value ) (defined in Kohana_Database)

Quote a database identifier

Objects passed to this function will be converted to strings. Database_Expression objects will be compiled. Database_Query objects will be compiled and converted to a sub-query. All other objects will be converted using the __toString method.

Parameters

mixed $value required - Any identifier

Return Values

string

Source Code

public function quote_identifier($value)
{
    // Identifiers are escaped by repeating them
    $escaped_identifier = $this->_identifier . $this->_identifier;

    if (is_array($value)) {
        list($value, $alias) = $value;
        $alias = str_replace($this->_identifier, $escaped_identifier, $alias);
    }

    if ($value instanceof Database_Query) {
        // Create a sub-query
        $value = '(' . $value->compile($this) . ')';
    } elseif ($value instanceof Database_Expression) {
        // Compile the expression
        $value = $value->compile($this);
    } else {
        // Convert to a string
        $value = (string) $value;

        $value = str_replace($this->_identifier, $escaped_identifier, $value);

        if (strpos($value, '.') !== false) {
            $parts = explode('.', $value);

            foreach ($parts as & $part) {
                // Quote each of the parts
                $part = $this->_identifier . $part . $this->_identifier;
            }

            $value = implode('.', $parts);
        } else {
            $value = $this->_identifier . $value . $this->_identifier;
        }
    }

    if (isset($alias)) {
        $value .= ' AS ' . $this->_identifier . $alias . $this->_identifier;
    }

    return $value;
}

public quote_table( mixed $table ) (defined in Kohana_Database)

Quote a database table name and adds the table prefix if needed.

$table = $db->quote_table($table);

Objects passed to this function will be converted to strings. Database_Expression objects will be compiled. Database_Query objects will be compiled and converted to a sub-query. All other objects will be converted using the __toString method.

Parameters

mixed $table required - Table name or [table, alias]

Tags

Uses - Database::quote_identifier, Database::table_prefix

Return Values

string

Source Code

public function quote_table($table)
{
    // Identifiers are escaped by repeating them
    $escaped_identifier = $this->_identifier . $this->_identifier;

    if (is_array($table)) {
        list($table, $alias) = $table;
        $alias = str_replace($this->_identifier, $escaped_identifier, $alias);
    }

    if ($table instanceof Database_Query) {
        // Create a sub-query
        $table = '(' . $table->compile($this) . ')';
    } elseif ($table instanceof Database_Expression) {
        // Compile the expression
        $table = $table->compile($this);
    } else {
        // Convert to a string
        $table = (string) $table;

        $table = str_replace($this->_identifier, $escaped_identifier, $table);

        if (strpos($table, '.') !== false) {
            $parts = explode('.', $table);

            if ($prefix = $this->table_prefix()) {
                // Get the offset of the table name, last part
                $offset = count($parts) - 1;

                // Add the table prefix to the table name
                $parts[$offset] = $prefix . $parts[$offset];
            }

            foreach ($parts as & $part) {
                // Quote each of the parts
                $part = $this->_identifier . $part . $this->_identifier;
            }

            $table = implode('.', $parts);
        } else {
            // Add the table prefix
            $table = $this->_identifier . $this->table_prefix() . $table . $this->_identifier;
        }
    }

    if (isset($alias)) {
        // Attach table prefix to alias
        $table .= ' AS ' . $this->_identifier . $this->table_prefix() . $alias . $this->_identifier;
    }

    return $table;
}

public table_prefix( ) (defined in Kohana_Database)

Return the table prefix defined in the current configuration.

$prefix = $db->table_prefix();

Return Values

string

Source Code

public function table_prefix()
{
    return $this->_config['table_prefix'];
}

protected _parse_type( string $type ) (defined in Kohana_Database)

Extracts the text between parentheses, if any.

// Returns: ['CHAR', '6']
list($type, $length) = $db->_parse_type('CHAR(6)');

Parameters

string $type required - $type

Return Values

array - List containing the type and length, if any

Source Code

protected function _parse_type($type)
{
    if (($open = strpos($type, '(')) === false) {
        // No length specified
        return [$type, null];
    }

    // Closing parenthesis
    $close = strrpos($type, ')', $open);

    // Length without parentheses
    $length = substr($type, $open + 1, $close - 1 - $open);

    // Type without the length
    $type = substr($type, 0, $open) . substr($type, $close + 1);

    return [$type, $length];
}

Modules

Database_PDO extends Kohana_Database_PDO extends Database extends Kohana_Database

Constants

Properties

Methods

Constants

SELECT

INSERT

UPDATE

DELETE

Properties

public static string $default

public static array $instances

public string $last_query

protected $_config

protected $_connection

protected $_identifier

protected $_instance

Methods

public __construct( ) (defined in Kohana_Database_PDO)

Return Values

Source Code

public begin( [ string $mode = NULL ] ) (defined in Kohana_Database_PDO)

Parameters

Return Values

Source Code

public commit( ) (defined in Kohana_Database_PDO)

Return Values

Source Code

public connect( ) (defined in Kohana_Database_PDO)

Tags

Return Values

Source Code

public create_aggregate( string $name , callback $step , callback $final [, integer $arguments = integer -1 ] ) (defined in Kohana_Database_PDO)

Parameters

Tags

Return Values

Source Code

public create_function( string $name , callback $callback [, integer $arguments = integer -1 ] ) (defined in Kohana_Database_PDO)

Parameters

Tags

Return Values

Source Code

public disconnect( ) (defined in Kohana_Database_PDO)

Return Values

Source Code

public escape( string $value ) (defined in Kohana_Database_PDO)

Parameters

Return Values

Source Code

public list_columns( string $table [, string $like = NULL , boolean $add_prefix = bool TRUE ] ) (defined in Kohana_Database_PDO)

Parameters

Return Values

Source Code

public list_tables( [ string $like = NULL ] ) (defined in Kohana_Database_PDO)

Parameters

Return Values

Source Code

public query( integer $type , string $sql [, mixed $as_object = bool FALSE , array $params = NULL ] ) (defined in Kohana_Database_PDO)

Parameters

Return Values

Source Code

public rollback( ) (defined in Kohana_Database_PDO)

Return Values

Source Code

public set_charset( string $charset ) (defined in Kohana_Database_PDO)

Parameters

Tags

Return Values

Source Code

public __destruct( ) (defined in Kohana_Database)

Return Values

Source Code

public __toString( ) (defined in Kohana_Database)

Return Values

Source Code

public count_records( mixed $table ) (defined in Kohana_Database)

Parameters

Return Values

Source Code

Database_PDO
extends Kohana_Database_PDO
extends Database
extends Kohana_Database

public static `string` $default

public static `array` $instances

public `string` $last_query