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<?php
/* SVN FILE: $Id: dbo_db2.php 6311 2008-01-02 06:33:52Z phpnut $ */
/**
* IBM DB2 for DBO
*
* This file supports IBM DB2 and Cloudscape (aka Apache Derby,
* Sun Java DB) using the native ibm_db2 extension:
* http://pecl.php.net/package/ibm_db2
*
* PHP versions 4 and 5
*
* CakePHP(tm) : Rapid Development Framework <http://www.cakephp.org/>
* Copyright 2007, Cake Software Foundation, Inc.
* 1785 E. Sahara Avenue, Suite 490-204
* Las Vegas, Nevada 89104
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @filesource
* @copyright Copyright 2005-2008, Cake Software Foundation, Inc.
* @link http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
* @package cake
* @subpackage cake.cake.libs.model.datasources.dbo
* @since CakePHP(tm) v 0.10.5.1790
* @version $Revision: 6311 $
* @modifiedby $LastChangedBy: phpnut $
* @lastmodified $Date: 2008-01-02 00:33:52 -0600 (Wed, 02 Jan 2008) $
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/
/**
* IBM DB2 for DBO
*
* This file supports IBM DB2 and Cloudscape (aka Apache Derby,
* Sun Java DB) using the native ibm_db2 extension:
* http://pecl.php.net/package/ibm_db2
*
* @package cake
* @subpackage cake.cake.libs.model.datasources.dbo
*/
class DboDb2 extends DboSource {
/**
* A short description of the type of driver.
*
* @var string
*/
var $description = 'IBM DB2 DBO Driver';
/**
* The start quote in which database column and table names should be wrapped.
*
* @var string
*/
var $startQuote = '';
/**
* The end quote in which database column and table names should be wrapped.
*
* @var string
*/
var $endQuote = '';
/**
* An array of base configuration settings to be used if settings are not
* provided, i.e. default host, port, and connection method.
*
* @var array
*/
var $_baseConfig = array(
'persistent' => true,
'login' => 'db2inst1',
'password' => '',
'database' => 'cake',
'schema' => '',
'connect' => 'db2_pconnect',
'hostname' => '127.0.0.1',
'port' => '50001',
'encoding' => 'UTF-8',
'cataloged' => true,
'autocommit' => true);
/**
* An array that maps Cake column types to database native column types.
* The mapped information can include a reference to a function that should
* be used to format the data, as well as a string that defines the
* formatting according to that function.
*
* @var array
*/
var $columns = array(
'primary_key' => array('name' => 'integer not null generated by default as identity (start with 1, increment by 1)'),
'string' => array('name' => 'varchar', 'limit' => '255'),
'text' => array('name' => 'clob'),
'integer' => array('name' => 'integer', 'limit' => '10', 'formatter' => 'intval'),
'float' => array('name' => 'double', 'formatter' => 'floatval'),
'datetime' => array('name' => 'timestamp', 'format' => 'Y-m-d-H.i.s', 'formatter' => 'date'),
'timestamp' => array('name' => 'timestamp', 'format' => 'Y-m-d-H.i.s', 'formatter' => 'date'),
'time' => array('name' => 'time', 'format' => 'H.i.s', 'formatter' => 'date'),
'date' => array('name' => 'date', 'format' => 'Y-m-d', 'formatter' => 'date'),
'binary' => array('name' => 'blob'),
'boolean' => array('name' => 'smallint', 'limit' => '1'));
/**
* A map for every result mapping tables to columns
*
* @var array result -> ( table -> column )
*/
var $_resultMap = array();
/**
* Connects to the database using options in the given configuration array.
*
* @return boolean True if the database could be connected, else false
*/
function connect() {
$config = $this->config;
$connect = $config['connect'];
$this->connected = false;
if ($config['cataloged']) {
$this->connection = $connect($config['database'], $config['login'], $config['password']);
} else {
$conn_string = sprintf(
"DRIVER={IBM DB2 ODBC DRIVER};DATABASE=%s;HOSTNAME=%s;PORT=%d;PROTOCOL=TCPIP;UID=%s;PWD=%s;",
$config['database'],
$config['hostname'],
$config['port'],
$config['login'],
$config['password']);
$this->connection = db2_connect($conn_string, '', '');
}
if ($this->connection) {
$this->connected = true;
}
if ($config['schema'] !== '') {
$this->_execute('SET CURRENT SCHEMA = ' . $config['schema']);
}
return $this->connected;
}
/**
* Disconnects from database.
*
* @return boolean True if the database could be disconnected, else false
*/
function disconnect() {
@db2_free_result($this->results);
$this->connected = !@db2_close($this->connection);
return !$this->connected;
}
/**
* Executes given SQL statement. We should use prepare / execute to allow the
* database server to reuse its access plan and increase the efficiency
* of your database access
*
* @param string $sql SQL statement
* @return resource Result resource identifier
* @access protected
*/
function _execute($sql) {
// get result from db
$result = db2_exec($this->connection, $sql);
if(!is_bool($result)){
// build table/column map for this result
$map = array();
$num_fields = db2_num_fields($result);
$index = 0;
$j = 0;
$offset = 0;
while ($j < $num_fields) {
$columnName = strtolower(db2_field_name($result, $j));
$tmp = strpos($sql, '.' . $columnName, $offset);
$tableName = substr($sql, $offset, ($tmp-$offset));
$tableName = substr($tableName, strrpos($tableName, ' ') + 1);
$map[$index++] = array($tableName, $columnName);
$j++;
$offset = strpos($sql, ' ', $tmp);
}
$this->_resultMap[$result] = $map;
}
return $result;
}
/**
* Returns an array of all the tables in the database.
* Should call parent::listSources twice in the method:
* once to see if the list is cached, and once to cache
* the list if not.
*
* @return array Array of tablenames in the database
*/
function listSources() {
$cache = parent::listSources();
if ($cache != null) {
return $cache;
}
$result = db2_tables($this->connection);
$tables = array();
while (db2_fetch_row($result)) {
$tables[] = strtolower(db2_result($result, 'TABLE_NAME'));
}
parent::listSources($tables);
return $tables;
}
/**
* Returns an array of the fields in given table name.
*
* @param Model $model Model object to describe
* @return array Fields in table. Keys are name and type
*/
function &describe(&$model) {
$cache = parent::describe($model);
if ($cache != null) {
return $cache;
}
$fields = array();
$result = db2_columns($this->connection, '', '', strtoupper($this->fullTableName($model)));
while (db2_fetch_row($result)) {
$fields[strtolower(db2_result($result, 'COLUMN_NAME'))] = array(
'type' => $this->column(strtolower(db2_result($result, 'TYPE_NAME'))),
'null' => db2_result($result, 'NULLABLE'),
'default' => db2_result($result, 'COLUMN_DEF'),
'length' => db2_result($result, 'COLUMN_SIZE')
);
}
$this->__cacheDescription($model->tablePrefix . $model->table, $fields);
return $fields;
}
/**
* Returns a quoted name of $data for use in an SQL statement.
*
* @param string $data Name (table.field) to be prepared for use in an SQL statement
* @return string Quoted for MySQL
*/
function name($data) {
return $data;
}
/**
* Returns a quoted and escaped string of $data for use in an SQL statement.
*
* @param string $data String to be prepared for use in an SQL statement
* @param string $column The column into which this data will be inserted
* @return string Quoted and escaped
* @todo Add logic that formats/escapes data based on column type
*/
function value($data, $column = null, $safe = false) {
$parent = parent::value($data, $column, $safe);
if ($parent != null) {
return $parent;
}
if ($data === null) {
return 'NULL';
}
if ($data === '') {
return "''";
}
switch ($column) {
case 'boolean':
$data = $this->boolean((bool)$data);
break;
case 'integer':
$data = intval($data);
break;
default:
$data = str_replace("'", "''", $data);
break;
}
// TODO: Make sure this isn't catching other numeric values
// that are going into string columns.
if ($column == 'integer' || is_numeric($data)) {
return $data;
} else {
return "'" . $data . "'";
}
}
/**
* Not sure about this one, MySQL needs it but does ODBC? Safer just to leave it
* Translates between PHP boolean values and MySQL (faked) boolean values
*
* @param mixed $data Value to be translated
* @return mixed Converted boolean value
*/
function boolean($data) {
if ($data === true || $data === false) {
if ($data === true) {
return 1;
}
return 0;
} else {
if (intval($data !== 0)) {
return true;
}
return false;
}
}
/**
* Begins a transaction. Returns true if the transaction was
* started successfully, otherwise false.
*
* @param unknown_type $model
* @return boolean True on success, false on fail
* (i.e. if the database/model does not support transactions).
*/
function begin(&$model) {
if (parent::begin($model)) {
if (db2_autocommit($this->connection, DB2_AUTOCOMMIT_OFF)) {
$this->_transactionStarted = true;
return true;
}
}
return false;
}
/**
* Commit a transaction
*
* @param unknown_type $model
* @return boolean True on success, false on fail
* (i.e. if the database/model does not support transactions,
* or a transaction has not started).
*/
function commit(&$model) {
if (parent::commit($model)) {
if (db2_commit($this->connection)) {
$this->_transactionStarted = false;
db2_autocommit($this->connection, DB2_AUTOCOMMIT_ON);
return true;
}
}
return false;
}
/**
* Rollback a transaction
*
* @param unknown_type $model
* @return boolean True on success, false on fail
* (i.e. if the database/model does not support transactions,
* or a transaction has not started).
*/
function rollback(&$model) {
if (parent::rollback($model)) {
$this->_transactionStarted = false;
db2_autocommit($this->connection, DB2_AUTOCOMMIT_ON);
return db2_rollback($this->connection);
}
return false;
}
/**
* Removes Identity (primary key) column from update data before returning to parent
*
* @param Model $model
* @param array $fields
* @param array $values
* @return array
*/
function update(&$model, $fields = array(), $values = array()) {
foreach ($fields as $i => $field) {
if ($field == $model->primaryKey) {
unset ($fields[$i]);
unset ($values[$i]);
break;
}
}
return parent::update($model, $fields, $values);
}
/**
* Returns a formatted error message from previous database operation.
* DB2 distinguishes between statement and connnection errors so we
* must check for both.
*
* @return string Error message with error number
*/
function lastError() {
if (db2_stmt_error()) {
return db2_stmt_error() . ': ' . db2_stmt_errormsg();
} elseif (db2_conn_error()) {
return db2_conn_error() . ': ' . db2_conn_errormsg();
}
return null;
}
/**
* Returns number of affected rows in previous database operation. If no previous operation exists,
* this returns false.
*
* @return integer Number of affected rows
*/
function lastAffected() {
if ($this->_result) {
return db2_num_rows($this->_result);
}
return null;
}
/**
* Returns number of rows in previous resultset. If no previous resultset exists,
* this returns false.
*
* @return integer Number of rows in resultset
*/
function lastNumRows() {
if ($this->_result) {
return db2_num_rows($this->_result);
}
return null;
}
/**
* Returns the ID generated from the previous INSERT operation.
*
* @param unknown_type $source
* @return in
*/
function lastInsertId($source = null) {
$data = $this->fetchRow(sprintf('SELECT SYSIBM.IDENTITY_VAL_LOCAL() AS ID FROM %s FETCH FIRST ROW ONLY', $source));
if ($data && isset($data[0]['id'])) {
return $data[0]['id'];
}
return null;
}
/**
* Returns a limit statement in the correct format for the particular database.
*
* @param integer $limit Limit of results returned
* @param integer $offset Offset from which to start results
* @return string SQL limit/offset statement
*/
function limit($limit, $offset = null) {
if ($limit) {
$rt = '';
// If limit is not in the passed value already, add a limit clause.
if (!strpos(strtolower($limit), 'limit') || strpos(strtolower($limit), 'limit') === 0) {
$rt = sprintf('FETCH FIRST %d ROWS ONLY', $limit);
}
// TODO: Implement paging with the offset. This could get hairy.
/*
WITH WHOLE AS
(SELECT FIRSTNME, MIDINIT, LASTNAME, SALARY,
ROW_NUMBER() OVER (ORDER BY SALARY DESC) AS RN
FROM EMPLOYEE)
SELECT FIRSTNME, MIDINIT, LASTNAME, SALARY, RN
FROM WHOLE
WHERE RN BETWEEN 10 AND 15
*/
/*
if ($offset) {
$rt .= ' ' . $offset . ',';
}
$rt .= ' ' . $limit;
*/
return $rt;
}
return null;
}
/**
* Converts database-layer column types to basic types
*
* @param string $real Real database-layer column type (i.e. "varchar(255)")
* @return string Abstract column type (i.e. "string")
*/
function column($real) {
if (is_array($real)) {
$col = $real['name'];
if (isset($real['limit'])) {
$col .= '(' . $real['limit'] . ')';
}
return $col;
}
$col = str_replace(')', '', $real);
$limit = null;
@list($col, $limit) = explode('(', $col);
if (in_array($col, array('date', 'time', 'datetime', 'timestamp'))) {
return $col;
}
if ($col == 'smallint') {
return 'boolean';
}
if (strpos($col, 'char') !== false) {
return 'string';
}
if (strpos($col, 'clob') !== false) {
return 'text';
}
if (strpos($col, 'blob') !== false || $col == 'image') {
return 'binary';
}
if (in_array($col, array('double', 'real', 'decimal'))) {
return 'float';
}
return 'text';
}
/**
* Maps a result set to an array so that returned fields are
* grouped by model. Any calculated fields, or fields that
* do not correspond to a particular model belong under array
* key 0.
*
* 1. Gets the column headers
*
* Post.id
* Post.title
*
* [0] => Array
* (
* [0] => Post
* [1] => id
* )
*
* [1] => Array
* (
* [0] => Post
* [1] => title
* )
*
* @param unknown_type $results
*/
function resultSet(&$results, $sql = null) {
$this->results =& $results;
$this->map = $this->_resultMap[$this->results];
}
/**
* Fetches the next row from the current result set
* Maps the records in the $result property to the map
* created in resultSet().
*
* 2. Gets the actual values.
*
* @return unknown
*/
function fetchResult() {
if ($row = db2_fetch_array($this->results)) {
$resultRow = array();
$i = 0;
foreach ($row as $index => $field) {
$table = $this->map[$index][0];
$column = strtolower($this->map[$index][1]);
$resultRow[$table][$column] = $row[$index];
$i++;
}
return $resultRow;
} else {
return false;
}
}
}
?>