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authorsvncommit <devs@roundcube.net>2005-10-02 11:36:35 +0000
committersvncommit <devs@roundcube.net>2005-10-02 11:36:35 +0000
commit1676e1ebda38922b609c501b3c3c34b881302122 (patch)
treeaf115b449e30bac37d7cf0459ed95d88d32f1282 /program/lib/DB/oci8.php
parent968bdc7c90f718560b84eb3b7e8e1d02cf4270f3 (diff)
Added PEAR:DB support plus database replication support
Diffstat (limited to 'program/lib/DB/oci8.php')
-rw-r--r--program/lib/DB/oci8.php1117
1 files changed, 1117 insertions, 0 deletions
diff --git a/program/lib/DB/oci8.php b/program/lib/DB/oci8.php
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+<?php
+
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * The PEAR DB driver for PHP's oci8 extension
+ * for interacting with Oracle databases
+ *
+ * PHP versions 4 and 5
+ *
+ * LICENSE: This source file is subject to version 3.0 of the PHP license
+ * that is available through the world-wide-web at the following URI:
+ * http://www.php.net/license/3_0.txt. If you did not receive a copy of
+ * the PHP License and are unable to obtain it through the web, please
+ * send a note to license@php.net so we can mail you a copy immediately.
+ *
+ * @category Database
+ * @package DB
+ * @author James L. Pine <jlp@valinux.com>
+ * @author Daniel Convissor <danielc@php.net>
+ * @copyright 1997-2005 The PHP Group
+ * @license http://www.php.net/license/3_0.txt PHP License 3.0
+ * @version CVS: $Id$
+ * @link http://pear.php.net/package/DB
+ */
+
+/**
+ * Obtain the DB_common class so it can be extended from
+ */
+require_once 'DB/common.php';
+
+/**
+ * The methods PEAR DB uses to interact with PHP's oci8 extension
+ * for interacting with Oracle databases
+ *
+ * Definitely works with versions 8 and 9 of Oracle.
+ *
+ * These methods overload the ones declared in DB_common.
+ *
+ * Be aware... OCIError() only appears to return anything when given a
+ * statement, so functions return the generic DB_ERROR instead of more
+ * useful errors that have to do with feedback from the database.
+ *
+ * @category Database
+ * @package DB
+ * @author James L. Pine <jlp@valinux.com>
+ * @author Daniel Convissor <danielc@php.net>
+ * @copyright 1997-2005 The PHP Group
+ * @license http://www.php.net/license/3_0.txt PHP License 3.0
+ * @version Release: @package_version@
+ * @link http://pear.php.net/package/DB
+ */
+class DB_oci8 extends DB_common
+{
+ // {{{ properties
+
+ /**
+ * The DB driver type (mysql, oci8, odbc, etc.)
+ * @var string
+ */
+ var $phptype = 'oci8';
+
+ /**
+ * The database syntax variant to be used (db2, access, etc.), if any
+ * @var string
+ */
+ var $dbsyntax = 'oci8';
+
+ /**
+ * The capabilities of this DB implementation
+ *
+ * The 'new_link' element contains the PHP version that first provided
+ * new_link support for this DBMS. Contains false if it's unsupported.
+ *
+ * Meaning of the 'limit' element:
+ * + 'emulate' = emulate with fetch row by number
+ * + 'alter' = alter the query
+ * + false = skip rows
+ *
+ * @var array
+ */
+ var $features = array(
+ 'limit' => 'alter',
+ 'new_link' => '5.0.0',
+ 'numrows' => 'subquery',
+ 'pconnect' => true,
+ 'prepare' => true,
+ 'ssl' => false,
+ 'transactions' => true,
+ );
+
+ /**
+ * A mapping of native error codes to DB error codes
+ * @var array
+ */
+ var $errorcode_map = array(
+ 1 => DB_ERROR_CONSTRAINT,
+ 900 => DB_ERROR_SYNTAX,
+ 904 => DB_ERROR_NOSUCHFIELD,
+ 913 => DB_ERROR_VALUE_COUNT_ON_ROW,
+ 921 => DB_ERROR_SYNTAX,
+ 923 => DB_ERROR_SYNTAX,
+ 942 => DB_ERROR_NOSUCHTABLE,
+ 955 => DB_ERROR_ALREADY_EXISTS,
+ 1400 => DB_ERROR_CONSTRAINT_NOT_NULL,
+ 1401 => DB_ERROR_INVALID,
+ 1407 => DB_ERROR_CONSTRAINT_NOT_NULL,
+ 1418 => DB_ERROR_NOT_FOUND,
+ 1476 => DB_ERROR_DIVZERO,
+ 1722 => DB_ERROR_INVALID_NUMBER,
+ 2289 => DB_ERROR_NOSUCHTABLE,
+ 2291 => DB_ERROR_CONSTRAINT,
+ 2292 => DB_ERROR_CONSTRAINT,
+ 2449 => DB_ERROR_CONSTRAINT,
+ );
+
+ /**
+ * The raw database connection created by PHP
+ * @var resource
+ */
+ var $connection;
+
+ /**
+ * The DSN information for connecting to a database
+ * @var array
+ */
+ var $dsn = array();
+
+
+ /**
+ * Should data manipulation queries be committed automatically?
+ * @var bool
+ * @access private
+ */
+ var $autocommit = true;
+
+ /**
+ * Stores the $data passed to execute() in the oci8 driver
+ *
+ * Gets reset to array() when simpleQuery() is run.
+ *
+ * Needed in case user wants to call numRows() after prepare/execute
+ * was used.
+ *
+ * @var array
+ * @access private
+ */
+ var $_data = array();
+
+ /**
+ * The result or statement handle from the most recently executed query
+ * @var resource
+ */
+ var $last_stmt;
+
+ /**
+ * Is the given prepared statement a data manipulation query?
+ * @var array
+ * @access private
+ */
+ var $manip_query = array();
+
+
+ // }}}
+ // {{{ constructor
+
+ /**
+ * This constructor calls <kbd>$this->DB_common()</kbd>
+ *
+ * @return void
+ */
+ function DB_oci8()
+ {
+ $this->DB_common();
+ }
+
+ // }}}
+ // {{{ connect()
+
+ /**
+ * Connect to the database server, log in and open the database
+ *
+ * Don't call this method directly. Use DB::connect() instead.
+ *
+ * If PHP is at version 5.0.0 or greater:
+ * + Generally, oci_connect() or oci_pconnect() are used.
+ * + But if the new_link DSN option is set to true, oci_new_connect()
+ * is used.
+ *
+ * When using PHP version 4.x, OCILogon() or OCIPLogon() are used.
+ *
+ * PEAR DB's oci8 driver supports the following extra DSN options:
+ * + charset The character set to be used on the connection.
+ * Only used if PHP is at version 5.0.0 or greater
+ * and the Oracle server is at 9.2 or greater.
+ * Available since PEAR DB 1.7.0.
+ * + new_link If set to true, causes subsequent calls to
+ * connect() to return a new connection link
+ * instead of the existing one. WARNING: this is
+ * not portable to other DBMS's.
+ * Available since PEAR DB 1.7.0.
+ *
+ * @param array $dsn the data source name
+ * @param bool $persistent should the connection be persistent?
+ *
+ * @return int DB_OK on success. A DB_Error object on failure.
+ */
+ function connect($dsn, $persistent = false)
+ {
+ if (!PEAR::loadExtension('oci8')) {
+ return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
+ }
+
+ $this->dsn = $dsn;
+ if ($dsn['dbsyntax']) {
+ $this->dbsyntax = $dsn['dbsyntax'];
+ }
+
+ if (function_exists('oci_connect')) {
+ if (isset($dsn['new_link'])
+ && ($dsn['new_link'] == 'true' || $dsn['new_link'] === true))
+ {
+ $connect_function = 'oci_new_connect';
+ } else {
+ $connect_function = $persistent ? 'oci_pconnect'
+ : 'oci_connect';
+ }
+
+ // Backwards compatibility with DB < 1.7.0
+ if (empty($dsn['database']) && !empty($dsn['hostspec'])) {
+ $db = $dsn['hostspec'];
+ } else {
+ $db = $dsn['database'];
+ }
+
+ $char = empty($dsn['charset']) ? null : $dsn['charset'];
+ $this->connection = @$connect_function($dsn['username'],
+ $dsn['password'],
+ $db,
+ $char);
+ $error = OCIError();
+ if (!empty($error) && $error['code'] == 12541) {
+ // Couldn't find TNS listener. Try direct connection.
+ $this->connection = @$connect_function($dsn['username'],
+ $dsn['password'],
+ null,
+ $char);
+ }
+ } else {
+ $connect_function = $persistent ? 'OCIPLogon' : 'OCILogon';
+ if ($dsn['hostspec']) {
+ $this->connection = @$connect_function($dsn['username'],
+ $dsn['password'],
+ $dsn['hostspec']);
+ } elseif ($dsn['username'] || $dsn['password']) {
+ $this->connection = @$connect_function($dsn['username'],
+ $dsn['password']);
+ }
+ }
+
+ if (!$this->connection) {
+ $error = OCIError();
+ $error = (is_array($error)) ? $error['message'] : null;
+ return $this->raiseError(DB_ERROR_CONNECT_FAILED,
+ null, null, null,
+ $error);
+ }
+ return DB_OK;
+ }
+
+ // }}}
+ // {{{ disconnect()
+
+ /**
+ * Disconnects from the database server
+ *
+ * @return bool TRUE on success, FALSE on failure
+ */
+ function disconnect()
+ {
+ if (function_exists('oci_close')) {
+ $ret = @oci_close($this->connection);
+ } else {
+ $ret = @OCILogOff($this->connection);
+ }
+ $this->connection = null;
+ return $ret;
+ }
+
+ // }}}
+ // {{{ simpleQuery()
+
+ /**
+ * Sends a query to the database server
+ *
+ * To determine how many rows of a result set get buffered using
+ * ocisetprefetch(), see the "result_buffering" option in setOptions().
+ * This option was added in Release 1.7.0.
+ *
+ * @param string the SQL query string
+ *
+ * @return mixed + a PHP result resrouce for successful SELECT queries
+ * + the DB_OK constant for other successful queries
+ * + a DB_Error object on failure
+ */
+ function simpleQuery($query)
+ {
+ $this->_data = array();
+ $this->last_parameters = array();
+ $this->last_query = $query;
+ $query = $this->modifyQuery($query);
+ $result = @OCIParse($this->connection, $query);
+ if (!$result) {
+ return $this->oci8RaiseError();
+ }
+ if ($this->autocommit) {
+ $success = @OCIExecute($result,OCI_COMMIT_ON_SUCCESS);
+ } else {
+ $success = @OCIExecute($result,OCI_DEFAULT);
+ }
+ if (!$success) {
+ return $this->oci8RaiseError($result);
+ }
+ $this->last_stmt = $result;
+ if (DB::isManip($query)) {
+ return DB_OK;
+ } else {
+ @ocisetprefetch($result, $this->options['result_buffering']);
+ return $result;
+ }
+ }
+
+ // }}}
+ // {{{ nextResult()
+
+ /**
+ * Move the internal oracle result pointer to the next available result
+ *
+ * @param a valid oci8 result resource
+ *
+ * @access public
+ *
+ * @return true if a result is available otherwise return false
+ */
+ function nextResult($result)
+ {
+ return false;
+ }
+
+ // }}}
+ // {{{ fetchInto()
+
+ /**
+ * Places a row from the result set into the given array
+ *
+ * Formating of the array and the data therein are configurable.
+ * See DB_result::fetchInto() for more information.
+ *
+ * This method is not meant to be called directly. Use
+ * DB_result::fetchInto() instead. It can't be declared "protected"
+ * because DB_result is a separate object.
+ *
+ * @param resource $result the query result resource
+ * @param array $arr the referenced array to put the data in
+ * @param int $fetchmode how the resulting array should be indexed
+ * @param int $rownum the row number to fetch (0 = first row)
+ *
+ * @return mixed DB_OK on success, NULL when the end of a result set is
+ * reached or on failure
+ *
+ * @see DB_result::fetchInto()
+ */
+ function fetchInto($result, &$arr, $fetchmode, $rownum = null)
+ {
+ if ($rownum !== null) {
+ return $this->raiseError(DB_ERROR_NOT_CAPABLE);
+ }
+ if ($fetchmode & DB_FETCHMODE_ASSOC) {
+ $moredata = @OCIFetchInto($result,$arr,OCI_ASSOC+OCI_RETURN_NULLS+OCI_RETURN_LOBS);
+ if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE &&
+ $moredata)
+ {
+ $arr = array_change_key_case($arr, CASE_LOWER);
+ }
+ } else {
+ $moredata = OCIFetchInto($result,$arr,OCI_RETURN_NULLS+OCI_RETURN_LOBS);
+ }
+ if (!$moredata) {
+ return null;
+ }
+ if ($this->options['portability'] & DB_PORTABILITY_RTRIM) {
+ $this->_rtrimArrayValues($arr);
+ }
+ if ($this->options['portability'] & DB_PORTABILITY_NULL_TO_EMPTY) {
+ $this->_convertNullArrayValuesToEmpty($arr);
+ }
+ return DB_OK;
+ }
+
+ // }}}
+ // {{{ freeResult()
+
+ /**
+ * Deletes the result set and frees the memory occupied by the result set
+ *
+ * This method is not meant to be called directly. Use
+ * DB_result::free() instead. It can't be declared "protected"
+ * because DB_result is a separate object.
+ *
+ * @param resource $result PHP's query result resource
+ *
+ * @return bool TRUE on success, FALSE if $result is invalid
+ *
+ * @see DB_result::free()
+ */
+ function freeResult($result)
+ {
+ return @OCIFreeStatement($result);
+ }
+
+ /**
+ * Frees the internal resources associated with a prepared query
+ *
+ * @param resource $stmt the prepared statement's resource
+ * @param bool $free_resource should the PHP resource be freed too?
+ * Use false if you need to get data
+ * from the result set later.
+ *
+ * @return bool TRUE on success, FALSE if $result is invalid
+ *
+ * @see DB_oci8::prepare()
+ */
+ function freePrepared($stmt, $free_resource = true)
+ {
+ if (!is_resource($stmt)) {
+ return false;
+ }
+ if ($free_resource) {
+ @ocifreestatement($stmt);
+ }
+ if (isset($this->prepare_types[(int)$stmt])) {
+ unset($this->prepare_types[(int)$stmt]);
+ unset($this->manip_query[(int)$stmt]);
+ } else {
+ return false;
+ }
+ return true;
+ }
+
+ // }}}
+ // {{{ numRows()
+
+ /**
+ * Gets the number of rows in a result set
+ *
+ * Only works if the DB_PORTABILITY_NUMROWS portability option
+ * is turned on.
+ *
+ * This method is not meant to be called directly. Use
+ * DB_result::numRows() instead. It can't be declared "protected"
+ * because DB_result is a separate object.
+ *
+ * @param resource $result PHP's query result resource
+ *
+ * @return int the number of rows. A DB_Error object on failure.
+ *
+ * @see DB_result::numRows(), DB_common::setOption()
+ */
+ function numRows($result)
+ {
+ // emulate numRows for Oracle. yuck.
+ if ($this->options['portability'] & DB_PORTABILITY_NUMROWS &&
+ $result === $this->last_stmt)
+ {
+ $countquery = 'SELECT COUNT(*) FROM ('.$this->last_query.')';
+ $save_query = $this->last_query;
+ $save_stmt = $this->last_stmt;
+
+ if (count($this->_data)) {
+ $smt = $this->prepare('SELECT COUNT(*) FROM ('.$this->last_query.')');
+ $count = $this->execute($smt, $this->_data);
+ } else {
+ $count =& $this->query($countquery);
+ }
+
+ if (DB::isError($count) ||
+ DB::isError($row = $count->fetchRow(DB_FETCHMODE_ORDERED)))
+ {
+ $this->last_query = $save_query;
+ $this->last_stmt = $save_stmt;
+ return $this->raiseError(DB_ERROR_NOT_CAPABLE);
+ }
+ return $row[0];
+ }
+ return $this->raiseError(DB_ERROR_NOT_CAPABLE);
+ }
+
+ // }}}
+ // {{{ numCols()
+
+ /**
+ * Gets the number of columns in a result set
+ *
+ * This method is not meant to be called directly. Use
+ * DB_result::numCols() instead. It can't be declared "protected"
+ * because DB_result is a separate object.
+ *
+ * @param resource $result PHP's query result resource
+ *
+ * @return int the number of columns. A DB_Error object on failure.
+ *
+ * @see DB_result::numCols()
+ */
+ function numCols($result)
+ {
+ $cols = @OCINumCols($result);
+ if (!$cols) {
+ return $this->oci8RaiseError($result);
+ }
+ return $cols;
+ }
+
+ // }}}
+ // {{{ prepare()
+
+ /**
+ * Prepares a query for multiple execution with execute().
+ *
+ * With oci8, this is emulated.
+ *
+ * prepare() requires a generic query as string like <code>
+ * INSERT INTO numbers VALUES (?, ?, ?)
+ * </code>. The <kbd>?</kbd> characters are placeholders.
+ *
+ * Three types of placeholders can be used:
+ * + <kbd>?</kbd> a quoted scalar value, i.e. strings, integers
+ * + <kbd>!</kbd> value is inserted 'as is'
+ * + <kbd>&</kbd> requires a file name. The file's contents get
+ * inserted into the query (i.e. saving binary
+ * data in a db)
+ *
+ * Use backslashes to escape placeholder characters if you don't want
+ * them to be interpreted as placeholders. Example: <code>
+ * "UPDATE foo SET col=? WHERE col='over \& under'"
+ * </code>
+ *
+ * @param string $query the query to be prepared
+ *
+ * @return mixed DB statement resource on success. DB_Error on failure.
+ *
+ * @see DB_oci8::execute()
+ */
+ function prepare($query)
+ {
+ $tokens = preg_split('/((?<!\\\)[&?!])/', $query, -1,
+ PREG_SPLIT_DELIM_CAPTURE);
+ $binds = count($tokens) - 1;
+ $token = 0;
+ $types = array();
+ $newquery = '';
+
+ foreach ($tokens as $key => $val) {
+ switch ($val) {
+ case '?':
+ $types[$token++] = DB_PARAM_SCALAR;
+ unset($tokens[$key]);
+ break;
+ case '&':
+ $types[$token++] = DB_PARAM_OPAQUE;
+ unset($tokens[$key]);
+ break;
+ case '!':
+ $types[$token++] = DB_PARAM_MISC;
+ unset($tokens[$key]);
+ break;
+ default:
+ $tokens[$key] = preg_replace('/\\\([&?!])/', "\\1", $val);
+ if ($key != $binds) {
+ $newquery .= $tokens[$key] . ':bind' . $token;
+ } else {
+ $newquery .= $tokens[$key];
+ }
+ }
+ }
+
+ $this->last_query = $query;
+ $newquery = $this->modifyQuery($newquery);
+ if (!$stmt = @OCIParse($this->connection, $newquery)) {
+ return $this->oci8RaiseError();
+ }
+ $this->prepare_types[(int)$stmt] = $types;
+ $this->manip_query[(int)$stmt] = DB::isManip($query);
+ return $stmt;
+ }
+
+ // }}}
+ // {{{ execute()
+
+ /**
+ * Executes a DB statement prepared with prepare().
+ *
+ * To determine how many rows of a result set get buffered using
+ * ocisetprefetch(), see the "result_buffering" option in setOptions().
+ * This option was added in Release 1.7.0.
+ *
+ * @param resource $stmt a DB statement resource returned from prepare()
+ * @param mixed $data array, string or numeric data to be used in
+ * execution of the statement. Quantity of items
+ * passed must match quantity of placeholders in
+ * query: meaning 1 for non-array items or the
+ * quantity of elements in the array.
+ *
+ * @return mixed returns an oic8 result resource for successful SELECT
+ * queries, DB_OK for other successful queries.
+ * A DB error object is returned on failure.
+ *
+ * @see DB_oci8::prepare()
+ */
+ function &execute($stmt, $data = array())
+ {
+ $data = (array)$data;
+ $this->last_parameters = $data;
+ $this->_data = $data;
+
+ $types =& $this->prepare_types[(int)$stmt];
+ if (count($types) != count($data)) {
+ $tmp =& $this->raiseError(DB_ERROR_MISMATCH);
+ return $tmp;
+ }
+
+ $i = 0;
+ foreach ($data as $key => $value) {
+ if ($types[$i] == DB_PARAM_MISC) {
+ /*
+ * Oracle doesn't seem to have the ability to pass a
+ * parameter along unchanged, so strip off quotes from start
+ * and end, plus turn two single quotes to one single quote,
+ * in order to avoid the quotes getting escaped by
+ * Oracle and ending up in the database.
+ */
+ $data[$key] = preg_replace("/^'(.*)'$/", "\\1", $data[$key]);
+ $data[$key] = str_replace("''", "'", $data[$key]);
+ } elseif ($types[$i] == DB_PARAM_OPAQUE) {
+ $fp = @fopen($data[$key], 'rb');
+ if (!$fp) {
+ $tmp =& $this->raiseError(DB_ERROR_ACCESS_VIOLATION);
+ return $tmp;
+ }
+ $data[$key] = fread($fp, filesize($data[$key]));
+ fclose($fp);
+ }
+ if (!@OCIBindByName($stmt, ':bind' . $i, $data[$key], -1)) {
+ $tmp = $this->oci8RaiseError($stmt);
+ return $tmp;
+ }
+ $i++;
+ }
+ if ($this->autocommit) {
+ $success = @OCIExecute($stmt, OCI_COMMIT_ON_SUCCESS);
+ } else {
+ $success = @OCIExecute($stmt, OCI_DEFAULT);
+ }
+ if (!$success) {
+ $tmp = $this->oci8RaiseError($stmt);
+ return $tmp;
+ }
+ $this->last_stmt = $stmt;
+ if ($this->manip_query[(int)$stmt]) {
+ $tmp = DB_OK;
+ } else {
+ @ocisetprefetch($stmt, $this->options['result_buffering']);
+ $tmp =& new DB_result($this, $stmt);
+ }
+ return $tmp;
+ }
+
+ // }}}
+ // {{{ autoCommit()
+
+ /**
+ * Enables or disables automatic commits
+ *
+ * @param bool $onoff true turns it on, false turns it off
+ *
+ * @return int DB_OK on success. A DB_Error object if the driver
+ * doesn't support auto-committing transactions.
+ */
+ function autoCommit($onoff = false)
+ {
+ $this->autocommit = (bool)$onoff;;
+ return DB_OK;
+ }
+
+ // }}}
+ // {{{ commit()
+
+ /**
+ * Commits the current transaction
+ *
+ * @return int DB_OK on success. A DB_Error object on failure.
+ */
+ function commit()
+ {
+ $result = @OCICommit($this->connection);
+ if (!$result) {
+ return $this->oci8RaiseError();
+ }
+ return DB_OK;
+ }
+
+ // }}}
+ // {{{ rollback()
+
+ /**
+ * Reverts the current transaction
+ *
+ * @return int DB_OK on success. A DB_Error object on failure.
+ */
+ function rollback()
+ {
+ $result = @OCIRollback($this->connection);
+ if (!$result) {
+ return $this->oci8RaiseError();
+ }
+ return DB_OK;
+ }
+
+ // }}}
+ // {{{ affectedRows()
+
+ /**
+ * Determines the number of rows affected by a data maniuplation query
+ *
+ * 0 is returned for queries that don't manipulate data.
+ *
+ * @return int the number of rows. A DB_Error object on failure.
+ */
+ function affectedRows()
+ {
+ if ($this->last_stmt === false) {
+ return $this->oci8RaiseError();
+ }
+ $result = @OCIRowCount($this->last_stmt);
+ if ($result === false) {
+ return $this->oci8RaiseError($this->last_stmt);
+ }
+ return $result;
+ }
+
+ // }}}
+ // {{{ modifyQuery()
+
+ /**
+ * Changes a query string for various DBMS specific reasons
+ *
+ * "SELECT 2+2" must be "SELECT 2+2 FROM dual" in Oracle.
+ *
+ * @param string $query the query string to modify
+ *
+ * @return string the modified query string
+ *
+ * @access protected
+ */
+ function modifyQuery($query)
+ {
+ if (preg_match('/^\s*SELECT/i', $query) &&
+ !preg_match('/\sFROM\s/i', $query)) {
+ $query .= ' FROM dual';
+ }
+ return $query;
+ }
+
+ // }}}
+ // {{{ modifyLimitQuery()
+
+ /**
+ * Adds LIMIT clauses to a query string according to current DBMS standards
+ *
+ * @param string $query the query to modify
+ * @param int $from the row to start to fetching (0 = the first row)
+ * @param int $count the numbers of rows to fetch
+ * @param mixed $params array, string or numeric data to be used in
+ * execution of the statement. Quantity of items
+ * passed must match quantity of placeholders in
+ * query: meaning 1 placeholder for non-array
+ * parameters or 1 placeholder per array element.
+ *
+ * @return string the query string with LIMIT clauses added
+ *
+ * @access protected
+ */
+ function modifyLimitQuery($query, $from, $count, $params = array())
+ {
+ // Let Oracle return the name of the columns instead of
+ // coding a "home" SQL parser
+
+ if (count($params)) {
+ $result = $this->prepare("SELECT * FROM ($query) "
+ . 'WHERE NULL = NULL');
+ $tmp =& $this->execute($result, $params);
+ } else {
+ $q_fields = "SELECT * FROM ($query) WHERE NULL = NULL";
+
+ if (!$result = @OCIParse($this->connection, $q_fields)) {
+ $this->last_query = $q_fields;
+ return $this->oci8RaiseError();
+ }
+ if (!@OCIExecute($result, OCI_DEFAULT)) {
+ $this->last_query = $q_fields;
+ return $this->oci8RaiseError($result);
+ }
+ }
+
+ $ncols = OCINumCols($result);
+ $cols = array();
+ for ( $i = 1; $i <= $ncols; $i++ ) {
+ $cols[] = '"' . OCIColumnName($result, $i) . '"';
+ }
+ $fields = implode(', ', $cols);
+ // XXX Test that (tip by John Lim)
+ //if (preg_match('/^\s*SELECT\s+/is', $query, $match)) {
+ // // Introduce the FIRST_ROWS Oracle query optimizer
+ // $query = substr($query, strlen($match[0]), strlen($query));
+ // $query = "SELECT /* +FIRST_ROWS */ " . $query;
+ //}
+
+ // Construct the query
+ // more at: http://marc.theaimsgroup.com/?l=php-db&m=99831958101212&w=2
+ // Perhaps this could be optimized with the use of Unions
+ $query = "SELECT $fields FROM".
+ " (SELECT rownum as linenum, $fields FROM".
+ " ($query)".
+ ' WHERE rownum <= '. ($from + $count) .
+ ') WHERE linenum >= ' . ++$from;
+ return $query;
+ }
+
+ // }}}
+ // {{{ nextId()
+
+ /**
+ * Returns the next free id in a sequence
+ *
+ * @param string $seq_name name of the sequence
+ * @param boolean $ondemand when true, the seqence is automatically
+ * created if it does not exist
+ *
+ * @return int the next id number in the sequence.
+ * A DB_Error object on failure.
+ *
+ * @see DB_common::nextID(), DB_common::getSequenceName(),
+ * DB_oci8::createSequence(), DB_oci8::dropSequence()
+ */
+ function nextId($seq_name, $ondemand = true)
+ {
+ $seqname = $this->getSequenceName($seq_name);
+ $repeat = 0;
+ do {
+ $this->expectError(DB_ERROR_NOSUCHTABLE);
+ $result =& $this->query("SELECT ${seqname}.nextval FROM dual");
+ $this->popExpect();
+ if ($ondemand && DB::isError($result) &&
+ $result->getCode() == DB_ERROR_NOSUCHTABLE) {
+ $repeat = 1;
+ $result = $this->createSequence($seq_name);
+ if (DB::isError($result)) {
+ return $this->raiseError($result);
+ }
+ } else {
+ $repeat = 0;
+ }
+ } while ($repeat);
+ if (DB::isError($result)) {
+ return $this->raiseError($result);
+ }
+ $arr = $result->fetchRow(DB_FETCHMODE_ORDERED);
+ return $arr[0];
+ }
+
+ /**
+ * Creates a new sequence
+ *
+ * @param string $seq_name name of the new sequence
+ *
+ * @return int DB_OK on success. A DB_Error object on failure.
+ *
+ * @see DB_common::createSequence(), DB_common::getSequenceName(),
+ * DB_oci8::nextID(), DB_oci8::dropSequence()
+ */
+ function createSequence($seq_name)
+ {
+ return $this->query('CREATE SEQUENCE '
+ . $this->getSequenceName($seq_name));
+ }
+
+ // }}}
+ // {{{ dropSequence()
+
+ /**
+ * Deletes a sequence
+ *
+ * @param string $seq_name name of the sequence to be deleted
+ *
+ * @return int DB_OK on success. A DB_Error object on failure.
+ *
+ * @see DB_common::dropSequence(), DB_common::getSequenceName(),
+ * DB_oci8::nextID(), DB_oci8::createSequence()
+ */
+ function dropSequence($seq_name)
+ {
+ return $this->query('DROP SEQUENCE '
+ . $this->getSequenceName($seq_name));
+ }
+
+ // }}}
+ // {{{ oci8RaiseError()
+
+ /**
+ * Produces a DB_Error object regarding the current problem
+ *
+ * @param int $errno if the error is being manually raised pass a
+ * DB_ERROR* constant here. If this isn't passed
+ * the error information gathered from the DBMS.
+ *
+ * @return object the DB_Error object
+ *
+ * @see DB_common::raiseError(),
+ * DB_oci8::errorNative(), DB_oci8::errorCode()
+ */
+ function oci8RaiseError($errno = null)
+ {
+ if ($errno === null) {
+ $error = @OCIError($this->connection);
+ return $this->raiseError($this->errorCode($error['code']),
+ null, null, null, $error['message']);
+ } elseif (is_resource($errno)) {
+ $error = @OCIError($errno);
+ return $this->raiseError($this->errorCode($error['code']),
+ null, null, null, $error['message']);
+ }
+ return $this->raiseError($this->errorCode($errno));
+ }
+
+ // }}}
+ // {{{ errorNative()
+
+ /**
+ * Gets the DBMS' native error code produced by the last query
+ *
+ * @return int the DBMS' error code. FALSE if the code could not be
+ * determined
+ */
+ function errorNative()
+ {
+ if (is_resource($this->last_stmt)) {
+ $error = @OCIError($this->last_stmt);
+ } else {
+ $error = @OCIError($this->connection);
+ }
+ if (is_array($error)) {
+ return $error['code'];
+ }
+ return false;
+ }
+
+ // }}}
+ // {{{ tableInfo()
+
+ /**
+ * Returns information about a table or a result set
+ *
+ * NOTE: only supports 'table' and 'flags' if <var>$result</var>
+ * is a table name.
+ *
+ * NOTE: flags won't contain index information.
+ *
+ * @param object|string $result DB_result object from a query or a
+ * string containing the name of a table.
+ * While this also accepts a query result
+ * resource identifier, this behavior is
+ * deprecated.
+ * @param int $mode a valid tableInfo mode
+ *
+ * @return array an associative array with the information requested.
+ * A DB_Error object on failure.
+ *
+ * @see DB_common::tableInfo()
+ */
+ function tableInfo($result, $mode = null)
+ {
+ if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
+ $case_func = 'strtolower';
+ } else {
+ $case_func = 'strval';
+ }
+
+ $res = array();
+
+ if (is_string($result)) {
+ /*
+ * Probably received a table name.
+ * Create a result resource identifier.
+ */
+ $result = strtoupper($result);
+ $q_fields = 'SELECT column_name, data_type, data_length, '
+ . 'nullable '
+ . 'FROM user_tab_columns '
+ . "WHERE table_name='$result' ORDER BY column_id";
+
+ $this->last_query = $q_fields;
+
+ if (!$stmt = @OCIParse($this->connection, $q_fields)) {
+ return $this->oci8RaiseError(DB_ERROR_NEED_MORE_DATA);
+ }
+ if (!@OCIExecute($stmt, OCI_DEFAULT)) {
+ return $this->oci8RaiseError($stmt);
+ }
+
+ $i = 0;
+ while (@OCIFetch($stmt)) {
+ $res[$i] = array(
+ 'table' => $case_func($result),
+ 'name' => $case_func(@OCIResult($stmt, 1)),
+ 'type' => @OCIResult($stmt, 2),
+ 'len' => @OCIResult($stmt, 3),
+ 'flags' => (@OCIResult($stmt, 4) == 'N') ? 'not_null' : '',
+ );
+ if ($mode & DB_TABLEINFO_ORDER) {
+ $res['order'][$res[$i]['name']] = $i;
+ }
+ if ($mode & DB_TABLEINFO_ORDERTABLE) {
+ $res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
+ }
+ $i++;
+ }
+
+ if ($mode) {
+ $res['num_fields'] = $i;
+ }
+ @OCIFreeStatement($stmt);
+
+ } else {
+ if (isset($result->result)) {
+ /*
+ * Probably received a result object.
+ * Extract the result resource identifier.
+ */
+ $result = $result->result;
+ }
+
+ $res = array();
+
+ if ($result === $this->last_stmt) {
+ $count = @OCINumCols($result);
+ if ($mode) {
+ $res['num_fields'] = $count;
+ }
+ for ($i = 0; $i < $count; $i++) {
+ $res[$i] = array(
+ 'table' => '',
+ 'name' => $case_func(@OCIColumnName($result, $i+1)),
+ 'type' => @OCIColumnType($result, $i+1),
+ 'len' => @OCIColumnSize($result, $i+1),
+ 'flags' => '',
+ );
+ if ($mode & DB_TABLEINFO_ORDER) {
+ $res['order'][$res[$i]['name']] = $i;
+ }
+ if ($mode & DB_TABLEINFO_ORDERTABLE) {
+ $res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
+ }
+ }
+ } else {
+ return $this->raiseError(DB_ERROR_NOT_CAPABLE);
+ }
+ }
+ return $res;
+ }
+
+ // }}}
+ // {{{ getSpecialQuery()
+
+ /**
+ * Obtains the query string needed for listing a given type of objects
+ *
+ * @param string $type the kind of objects you want to retrieve
+ *
+ * @return string the SQL query string or null if the driver doesn't
+ * support the object type requested
+ *
+ * @access protected
+ * @see DB_common::getListOf()
+ */
+ function getSpecialQuery($type)
+ {
+ switch ($type) {
+ case 'tables':
+ return 'SELECT table_name FROM user_tables';
+ case 'synonyms':
+ return 'SELECT synonym_name FROM user_synonyms';
+ default:
+ return null;
+ }
+ }
+
+ // }}}
+
+}
+
+/*
+ * Local variables:
+ * tab-width: 4
+ * c-basic-offset: 4
+ * End:
+ */
+
+?>