oci8.php

来自「PHP 知识管理系统（基于树结构的知识管理系统）, 英文原版的PHP源码。」· PHP 代码 · 共 900 行 · 第 1/2 页

    {
        if (!is_array($data)) {
            $data = array($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 {
            $tmp =& new DB_result($this, $stmt);
        }
        return $tmp;
    }

    // }}}
    // {{{ autoCommit()

    /**
     * Enable/disable automatic commits
     *
     * @param $onoff true/false whether to autocommit
     */
    function autoCommit($onoff = false)
    {
        $this->autoCommit = (bool)$onoff;;
        return DB_OK;
    }

    // }}}
    // {{{ commit()

    /**
     * Commit transactions on the current connection
     *
     * @return DB_ERROR or DB_OK
     */
    function commit()
    {
        $result = @OCICommit($this->connection);
        if (!$result) {
            return $this->oci8RaiseError();
        }
        return DB_OK;
    }

    // }}}
    // {{{ rollback()

    /**
     * Roll back all uncommitted transactions on the current connection.
     *
     * @return DB_ERROR or DB_OK
     */
    function rollback()
    {
        $result = @OCIRollback($this->connection);
        if (!$result) {
            return $this->oci8RaiseError();
        }
        return DB_OK;
    }

    // }}}
    // {{{ affectedRows()

    /**
     * Gets the number of rows affected by the last query.
     * if the last query was a select, returns 0.
     *
     * @return number of rows affected by the last query or DB_ERROR
     */
    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()

    function modifyQuery($query)
    {
        // "SELECT 2+2" must be "SELECT 2+2 FROM dual" in Oracle
        if (preg_match('/^\s*SELECT/i', $query) &&
            !preg_match('/\sFROM\s/i', $query)) {
            $query .= ' FROM dual';
        }
        return $query;
    }

    // }}}
    // {{{ modifyLimitQuery()

    /**
     * Emulate the row limit support altering the query
     *
     * @param string $query The query to treat
     * @param int    $from  The row to start to fetch from
     * @param int    $count The offset
     * @return string The modified query
     *
     * @author Tomas V.V.Cox <[e-mail]>
     */
    function modifyLimitQuery($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 $ondemand  when true, the seqence is automatically
     *                           created if it does not exist
     *
     * @return int  the next id number in the sequence.  DB_Error if problem.
     *
     * @internal
     * @see DB_common::nextID()
     * @access public
     */
    function nextId($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 $seq_name  name of the new sequence
     *
     * @return int  DB_OK on success.  A DB_Error object is returned if
     *              problems arise.
     *
     * @internal
     * @see DB_common::createSequence()
     * @access public
     */
    function createSequence($seq_name)
    {
        $seqname = $this->getSequenceName($seq_name);
        return $this->query("CREATE SEQUENCE ${seqname}");
    }

    // }}}
    // {{{ dropSequence()

    /**
     * Deletes a sequence
     *
     * @param string $seq_name  name of the sequence to be deleted
     *
     * @return int  DB_OK on success.  DB_Error if problems.
     *
     * @internal
     * @see DB_common::dropSequence()
     * @access public
     */
    function dropSequence($seq_name)
    {
        $seqname = $this->getSequenceName($seq_name);
        return $this->query("DROP SEQUENCE ${seqname}");
    }

    // }}}
    // {{{ oci8RaiseError()

    /**
     * Gather information about an error, then use that info to create a
     * DB error object and finally return that object.
     *
     * @param  integer  $errno  PEAR error number (usually a DB constant) if
     *                          manually raising an error
     * @return object  DB error object
     * @see DB_common::errorCode()
     * @see DB_common::raiseError()
     */
    function oci8RaiseError($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));
    }

    // }}}
    // {{{ getSpecialQuery()

    /**
     * Returns the query needed to get some backend info
     * @param string $type What kind of info you want to retrieve
     * @return string The SQL query string
     */
    function getSpecialQuery($type)
    {
        switch ($type) {
            case 'tables':
                return 'SELECT table_name FROM user_tables';
            default:
                return null;
        }
    }

    // }}}
    // {{{ 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
     * @param int            $mode    a valid tableInfo mode
     * @return array  an associative array with the information requested
     *                or an error object if something is wrong
     * @access public
     * @internal
     * @see DB_common::tableInfo()
     */
    function tableInfo($result, $mode = null)
    {
        if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
            $case_func = 'strtolower';
        } else {
            $case_func = 'strval';
        }

        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]['table'] = $case_func($result);
                $res[$i]['name']  = $case_func(@OCIResult($stmt, 1));
                $res[$i]['type']  = @OCIResult($stmt, 2);
                $res[$i]['len']   = @OCIResult($stmt, 3);
                $res[$i]['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;
            } else {
                /*
                 * ELSE, probably received a result resource identifier.
                 * Deprecated.  Here for compatibility only.
                 */
            }

            if ($result === $this->last_stmt) {
                $count = @OCINumCols($result);

                for ($i=0; $i<$count; $i++) {
                    $res[$i]['table'] = '';
                    $res[$i]['name']  = $case_func(@OCIColumnName($result, $i+1));
                    $res[$i]['type']  = @OCIColumnType($result, $i+1);
                    $res[$i]['len']   = @OCIColumnSize($result, $i+1);
                    $res[$i]['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;
                    }
                }

                if ($mode) {
                    $res['num_fields'] = $count;
                }

            } else {
                return $this->raiseError(DB_ERROR_NOT_CAPABLE);
            }
        }
        return $res;
    }

    // }}}

}

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 */

?>