* @author Daniel Convissor * @copyright 1997-2005 The PHP Group * @license http://www.php.net/license/3_0.txt PHP License 3.0 * @version CVS: $Id: ifx.php,v 1.74 2007/01/12 03:11:17 aharvey Exp $ * @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 ifx extension * for interacting with Informix databases * * These methods overload the ones declared in DB_common. * * More info on Informix errors can be found at: * http://www.informix.com/answers/english/ierrors.htm * * TODO: * - set needed env Informix vars on connect * - implement native prepare/execute * * @category Database * @package DB * @author Tomas V.V.Cox * @author Daniel Convissor * @copyright 1997-2005 The PHP Group * @license http://www.php.net/license/3_0.txt PHP License 3.0 * @version Release: 1.7.11 * @link http://pear.php.net/package/DB */ class DB_ifx extends DB_common { // {{{ properties /** * The DB driver type (mysql, oci8, odbc, etc.) * @var string */ var $phptype = 'ifx'; /** * The database syntax variant to be used (db2, access, etc.), if any * @var string */ var $dbsyntax = 'ifx'; /** * 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' => 'emulate', 'new_link' => false, 'numrows' => 'emulate', 'pconnect' => true, 'prepare' => false, 'ssl' => false, 'transactions' => true, ); /** * A mapping of native error codes to DB error codes * @var array */ var $errorcode_map = array( '-201' => DB_ERROR_SYNTAX, '-206' => DB_ERROR_NOSUCHTABLE, '-217' => DB_ERROR_NOSUCHFIELD, '-236' => DB_ERROR_VALUE_COUNT_ON_ROW, '-239' => DB_ERROR_CONSTRAINT, '-253' => DB_ERROR_SYNTAX, '-268' => DB_ERROR_CONSTRAINT, '-292' => DB_ERROR_CONSTRAINT_NOT_NULL, '-310' => DB_ERROR_ALREADY_EXISTS, '-316' => DB_ERROR_ALREADY_EXISTS, '-319' => DB_ERROR_NOT_FOUND, '-329' => DB_ERROR_NODBSELECTED, '-346' => DB_ERROR_CONSTRAINT, '-386' => DB_ERROR_CONSTRAINT_NOT_NULL, '-391' => DB_ERROR_CONSTRAINT_NOT_NULL, '-554' => DB_ERROR_SYNTAX, '-691' => DB_ERROR_CONSTRAINT, '-692' => DB_ERROR_CONSTRAINT, '-703' => DB_ERROR_CONSTRAINT_NOT_NULL, '-1202' => DB_ERROR_DIVZERO, '-1204' => DB_ERROR_INVALID_DATE, '-1205' => DB_ERROR_INVALID_DATE, '-1206' => DB_ERROR_INVALID_DATE, '-1209' => DB_ERROR_INVALID_DATE, '-1210' => DB_ERROR_INVALID_DATE, '-1212' => DB_ERROR_INVALID_DATE, '-1213' => DB_ERROR_INVALID_NUMBER, ); /** * 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; /** * The quantity of transactions begun * * {@internal While this is private, it can't actually be designated * private in PHP 5 because it is directly accessed in the test suite.}} * * @var integer * @access private */ var $transaction_opcount = 0; /** * The number of rows affected by a data manipulation query * @var integer * @access private */ var $affected = 0; // }}} // {{{ constructor /** * This constructor calls $this->DB_common() * * @return void */ function DB_ifx() { $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. * * @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('informix') && !PEAR::loadExtension('Informix')) { return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND); } $this->dsn = $dsn; if ($dsn['dbsyntax']) { $this->dbsyntax = $dsn['dbsyntax']; } $dbhost = $dsn['hostspec'] ? '@' . $dsn['hostspec'] : ''; $dbname = $dsn['database'] ? $dsn['database'] . $dbhost : ''; $user = $dsn['username'] ? $dsn['username'] : ''; $pw = $dsn['password'] ? $dsn['password'] : ''; $connect_function = $persistent ? 'ifx_pconnect' : 'ifx_connect'; $this->connection = @$connect_function($dbname, $user, $pw); if (!is_resource($this->connection)) { return $this->ifxRaiseError(DB_ERROR_CONNECT_FAILED); } return DB_OK; } // }}} // {{{ disconnect() /** * Disconnects from the database server * * @return bool TRUE on success, FALSE on failure */ function disconnect() { $ret = @ifx_close($this->connection); $this->connection = null; return $ret; } // }}} // {{{ simpleQuery() /** * Sends a query to the database server * * @param string the SQL query string * * @return mixed + a PHP result resrouce for successful SELECT queries * + the DB_OK constant for other successful queries * + a DB_Error object on failure */ function simpleQuery($query) { $ismanip = $this->_checkManip($query); $this->last_query = $query; $this->affected = null; if (preg_match('/(SELECT|EXECUTE)/i', $query)) { //TESTME: Use !DB::isManip()? // the scroll is needed for fetching absolute row numbers // in a select query result $result = @ifx_query($query, $this->connection, IFX_SCROLL); } else { if (!$this->autocommit && $ismanip) { if ($this->transaction_opcount == 0) { $result = @ifx_query('BEGIN WORK', $this->connection); if (!$result) { return $this->ifxRaiseError(); } } $this->transaction_opcount++; } $result = @ifx_query($query, $this->connection); } if (!$result) { return $this->ifxRaiseError(); } $this->affected = @ifx_affected_rows($result); // Determine which queries should return data, and which // should return an error code only. if (preg_match('/(SELECT|EXECUTE)/i', $query)) { return $result; } // XXX Testme: free results inside a transaction // may cause to stop it and commit the work? // Result has to be freed even with a insert or update @ifx_free_result($result); return DB_OK; } // }}} // {{{ nextResult() /** * Move the internal ifx result pointer to the next available result * * @param a valid fbsql result resource * * @access public * * @return true if a result is available otherwise return false */ function nextResult($result) { return false; } // }}} // {{{ affectedRows() /** * Determines the number of rows affected by a data maniuplation query * * 0 is returned for queries that don't manipulate data. * * @return int the number of rows. A DB_Error object on failure. */ function affectedRows() { if ($this->_last_query_manip) { return $this->affected; } else { return 0; } } // }}} // {{{ 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) && ($rownum < 0)) { return null; } if ($rownum === null) { /* * Even though fetch_row() should return the next row if * $rownum is null, it doesn't in all cases. Bug 598. */ $rownum = 'NEXT'; } else { // Index starts at row 1, unlike most DBMS's starting at 0. $rownum++; } if (!$arr = @ifx_fetch_row($result, $rownum)) { return null; } if ($fetchmode !== DB_FETCHMODE_ASSOC) { $i=0; $order = array(); foreach ($arr as $val) { $order[$i++] = $val; } $arr = $order; } elseif ($fetchmode == DB_FETCHMODE_ASSOC && $this->options['portability'] & DB_PORTABILITY_LOWERCASE) { $arr = array_change_key_case($arr, CASE_LOWER); } 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; } // }}} // {{{ 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) { if (!$cols = @ifx_num_fields($result)) { return $this->ifxRaiseError(); } return $cols; } // }}} // {{{ 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 is_resource($result) ? ifx_free_result($result) : false; } // }}} // {{{ 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 = true) { // XXX if $this->transaction_opcount > 0, we should probably // issue a warning here. $this->autocommit = $onoff ? true : false; return DB_OK; } // }}} // {{{ commit() /** * Commits the current transaction * * @return int DB_OK on success. A DB_Error object on failure. */ function commit() { if ($this->transaction_opcount > 0) { $result = @ifx_query('COMMIT WORK', $this->connection); $this->transaction_opcount = 0; if (!$result) { return $this->ifxRaiseError(); } } return DB_OK; } // }}} // {{{ rollback() /** * Reverts the current transaction * * @return int DB_OK on success. A DB_Error object on failure. */ function rollback() { if ($this->transaction_opcount > 0) { $result = @ifx_query('ROLLBACK WORK', $this->connection); $this->transaction_opcount = 0; if (!$result) { return $this->ifxRaiseError(); } } return DB_OK; } // }}} // {{{ ifxRaiseError() /** * Produces a DB_Error object regarding the current problem * * @param int $errno if the error is being manually raised pass a * DB_ERROR* constant here. If this isn't passed * the error information gathered from the DBMS. * * @return object the DB_Error object * * @see DB_common::raiseError(), * DB_ifx::errorNative(), DB_ifx::errorCode() */ function ifxRaiseError($errno = null) { if ($errno === null) { $errno = $this->errorCode(ifx_error()); } return $this->raiseError($errno, null, null, null, $this->errorNative()); } // }}} // {{{ errorNative() /** * Gets the DBMS' native error code and message produced by the last query * * @return string the DBMS' error code and message */ function errorNative() { return @ifx_error() . ' ' . @ifx_errormsg(); } // }}} // {{{ errorCode() /** * Maps native error codes to DB's portable ones. * * Requires that the DB implementation's constructor fills * in the $errorcode_map property. * * @param string $nativecode error code returned by the database * @return int a portable DB error code, or DB_ERROR if this DB * implementation has no mapping for the given error code. */ function errorCode($nativecode) { if (ereg('SQLCODE=(.*)]', $nativecode, $match)) { $code = $match[1]; if (isset($this->errorcode_map[$code])) { return $this->errorcode_map[$code]; } } return DB_ERROR; } // }}} // {{{ tableInfo() /** * Returns information about a table or a result set * * NOTE: only supports 'table' if $result is a table name. * * If analyzing a query result and the result has duplicate field names, * an error will be raised saying * can't distinguish duplicate field names. * * @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 $mode a valid tableInfo mode * * @return array an associative array with the information requested. * A DB_Error object on failure. * * @see DB_common::tableInfo() * @since Method available since Release 1.6.0 */ function tableInfo($result, $mode = null) { if (is_string($result)) { /* * Probably received a table name. * Create a result resource identifier. */ $id = @ifx_query("SELECT * FROM $result WHERE 1=0", $this->connection); $got_string = true; } elseif (isset($result->result)) { /* * Probably received a result object. * Extract the result resource identifier. */ $id = $result->result; $got_string = false; } else { /* * Probably received a result resource identifier. * Copy it. */ $id = $result; $got_string = false; } if (!is_resource($id)) { return $this->ifxRaiseError(DB_ERROR_NEED_MORE_DATA); } $flds = @ifx_fieldproperties($id); $count = @ifx_num_fields($id); if (count($flds) != $count) { return $this->raiseError("can't distinguish duplicate field names"); } if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) { $case_func = 'strtolower'; } else { $case_func = 'strval'; } $i = 0; $res = array(); if ($mode) { $res['num_fields'] = $count; } foreach ($flds as $key => $value) { $props = explode(';', $value); $res[$i] = array( 'table' => $got_string ? $case_func($result) : '', 'name' => $case_func($key), 'type' => $props[0], 'len' => $props[1], 'flags' => $props[4] == 'N' ? 'not_null' : '', ); if ($mode & DB_TABLEINFO_ORDER) { $res['order'][$res[$i]['name']] = $i; } if ($mode & DB_TABLEINFO_ORDERTABLE) { $res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i; } $i++; } // free the result only if we were called on a table if ($got_string) { @ifx_free_result($id); } 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 tabname FROM systables WHERE tabid >= 100'; default: return null; } } // }}} } /* * Local variables: * tab-width: 4 * c-basic-offset: 4 * End: */ ?>