mysqli.php.svn-base

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。」· SVN-BASE 代码 · 共 961 行 · 第 1/3 页

     *
     * @internal
     * @see DB_common::dropSequence()
     * @access public
     */
    function dropSequence($seq_name)
    {
        return $this->query('DROP TABLE ' . $this->getSequenceName($seq_name));
    }

    // }}}
    // {{{ _BCsequence()

    /**
     * Backwards compatibility with old sequence emulation implementation
     * (clean up the dupes).
     *
     * @param string $seqname The sequence name to clean up
     * @return mixed DB_Error or true
     */
    function _BCsequence($seqname)
    {
        // Obtain a user-level lock... this will release any previous
        // application locks, but unlike LOCK TABLES, it does not abort
        // the current transaction and is much less frequently used.
        $result = $this->getOne("SELECT GET_LOCK('${seqname}_lock',10)");
        if (DB::isError($result)) {
            return $result;
        }
        if ($result == 0) {
            // Failed to get the lock, can't do the conversion, bail
            // with a DB_ERROR_NOT_LOCKED error
            return $this->mysqlRaiseError(DB_ERROR_NOT_LOCKED);
        }

        $highest_id = $this->getOne("SELECT MAX(id) FROM ${seqname}");
        if (DB::isError($highest_id)) {
            return $highest_id;
        }
        // This should kill all rows except the highest
        // We should probably do something if $highest_id isn't
        // numeric, but I'm at a loss as how to handle that...
        $result = $this->query("DELETE FROM ${seqname} WHERE id <> $highest_id");
        if (DB::isError($result)) {
            return $result;
        }

        // If another thread has been waiting for this lock,
        // it will go thru the above procedure, but will have no
        // real effect
        $result = $this->getOne("SELECT RELEASE_LOCK('${seqname}_lock')");
        if (DB::isError($result)) {
            return $result;
        }
        return true;
    }

    // }}}
    // {{{ quoteIdentifier()

    /**
     * Quote a string so it can be safely used as a table or column name
     *
     * Quoting style depends on which database driver is being used.
     *
     * MySQL can't handle the backtick character (<kbd>`</kbd>) in
     * table or column names.
     *
     * @param string $str  identifier name to be quoted
     *
     * @return string  quoted identifier string
     *
     * @since 1.6.0
     * @access public
     * @internal
     */
    function quoteIdentifier($str)
    {
        return '`' . $str . '`';
    }

    // }}}
    // {{{ escapeSimple()

    /**
     * Escape a string according to the current DBMS's standards
     *
     * @param string $str  the string to be escaped
     *
     * @return string  the escaped string
     *
     * @internal
     */
    function escapeSimple($str) {
        return @mysqli_real_escape_string($this->connection, $str);
    }

    // }}}
    // {{{ modifyQuery()

    function modifyQuery($query)
    {
        return $query;
    }

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

    function modifyLimitQuery($query, $from, $count, $params = array())
    {
        if (DB::isManip($query)) {
            return $query . " LIMIT $count";
        } else {
            return $query . " LIMIT $from, $count";
        }
    }

    // }}}
    // {{{ mysqlRaiseError()

    /**
     * Gather information about an error, then use that info to create a
     * DB error object and finally return that object.
     *
     * @param  integer  $errno  PEAR error number (usually a DB constant) if
     *                          manually raising an error
     * @return object  DB error object
     * @see DB_common::errorCode()
     * @see DB_common::raiseError()
     */
    function mysqlRaiseError($errno = null)
    {
        if ($errno === null) {
            if ($this->options['portability'] & DB_PORTABILITY_ERRORS) {
                $this->errorcode_map[1022] = DB_ERROR_CONSTRAINT;
                $this->errorcode_map[1048] = DB_ERROR_CONSTRAINT_NOT_NULL;
                $this->errorcode_map[1062] = DB_ERROR_CONSTRAINT;
            } else {
                // Doing this in case mode changes during runtime.
                $this->errorcode_map[1022] = DB_ERROR_ALREADY_EXISTS;
                $this->errorcode_map[1048] = DB_ERROR_CONSTRAINT;
                $this->errorcode_map[1062] = DB_ERROR_ALREADY_EXISTS;
            }
            $errno = $this->errorCode(mysqli_errno($this->connection));
        }
        return $this->raiseError($errno, null, null, null,
                                 @mysqli_errno($this->connection) . ' ** ' .
                                 @mysqli_error($this->connection));
    }

    // }}}
    // {{{ tableInfo()

    /**
     * Returns information about a table or a result set.
     *
     * WARNING: this method will probably not work because the mysqli_*()
     * functions it relies upon may not exist.
     *
     * @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, $mode = null) {
        if (isset($result->result)) {
            /*
             * Probably received a result object.
             * Extract the result resource identifier.
             */
            $id = $result->result;
            $got_string = false;
        } elseif (is_string($result)) {
            /*
             * Probably received a table name.
             * Create a result resource identifier.
             */
            $id = @mysqli_query($this->connection,
                                "SELECT * FROM $result LIMIT 0");
            $got_string = true;
        } else {
            /*
             * Probably received a result resource identifier.
             * Copy it.
             * Deprecated.  Here for compatibility only.
             */
            $id = $result;
            $got_string = false;
        }

        if (!is_a($id, 'mysqli_result')) {
            return $this->mysqlRaiseError(DB_ERROR_NEED_MORE_DATA);
        }

        if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
            $case_func = 'strtolower';
        } else {
            $case_func = 'strval';
        }

        $count = @mysqli_num_fields($id);

        // made this IF due to performance (one if is faster than $count if's)
        if (!$mode) {
            for ($i=0; $i<$count; $i++) {
                $tmp = @mysqli_fetch_field($id);
                $res[$i]['table'] = $case_func($tmp->table);
                $res[$i]['name']  = $case_func($tmp->name);
                $res[$i]['type']  = isset($this->mysqli_types[$tmp->type]) ?
                                          $this->mysqli_types[$tmp->type] :
                                          'unknown';
                $res[$i]['len']   = $tmp->max_length;

                $res[$i]['flags'] = '';
                foreach ($this->mysqli_flags as $const => $means) {
                    if ($tmp->flags & $const) {
                        $res[$i]['flags'] .= $means . ' ';
                    }
                }
                if ($tmp->def) {
                    $res[$i]['flags'] .= 'default_' . rawurlencode($tmp->def);
                }
                $res[$i]['flags'] = trim($res[$i]['flags']);
            }
        } else { // full
            $res['num_fields']= $count;

            for ($i=0; $i<$count; $i++) {
                $tmp = @mysqli_fetch_field($id);
                $res[$i]['table'] = $case_func($tmp->table);
                $res[$i]['name']  = $case_func($tmp->name);
                $res[$i]['type']  = isset($this->mysqli_types[$tmp->type]) ?
                                          $this->mysqli_types[$tmp->type] :
                                          'unknown';
                $res[$i]['len']   = $tmp->max_length;

                $res[$i]['flags'] = '';
                foreach ($this->mysqli_flags as $const => $means) {
                    if ($tmp->flags & $const) {
                        $res[$i]['flags'] .= $means . ' ';
                    }
                }
                if ($tmp->def) {
                    $res[$i]['flags'] .= 'default_' . rawurlencode($tmp->def);
                }
                $res[$i]['flags'] = trim($res[$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;
                }
            }
        }

        // free the result only if we were called on a table
        if ($got_string) {
            @mysqli_free_result($id);
        }
        return $res;
    }

    // }}}
    // {{{ 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 'SHOW TABLES';
            case 'views':
                return DB_ERROR_NOT_CAPABLE;
            case 'users':
                $sql = 'select distinct User from user';
                if ($this->dsn['database'] != 'mysql') {
                    $dsn = $this->dsn;
                    $dsn['database'] = 'mysql';
                    if (DB::isError($db = DB::connect($dsn))) {
                        return $db;
                    }
                    $sql = $db->getCol($sql);
                    $db->disconnect();
                    // XXX Fixme the mysql driver should take care of this
                    if (!@mysqli_select_db($this->connection, $this->dsn['database'])) {
                        return $this->mysqlRaiseError(DB_ERROR_NODBSELECTED);
                    }
                }
                return $sql;
            case 'databases':
                return 'SHOW DATABASES';
            default:
                return null;
        }
    }

   // }}}

}

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

?>