晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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/* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1335  USA */

#ifndef SQL_DB_INCLUDED
#define SQL_DB_INCLUDED

#include "hash.h"                               /* HASH */

class THD;

int mysql_create_db(THD *thd, const Lex_ident_db &db, DDL_options_st options,
                    const Schema_specification_st *create);
bool mysql_alter_db(THD *thd, const Lex_ident_db &db,
                    const Schema_specification_st *create);
bool mysql_rm_db(THD *thd, const Lex_ident_db &db, bool if_exists);
bool mysql_upgrade_db(THD *thd, const Lex_ident_db &old_db);
uint mysql_change_db(THD *thd, const LEX_CSTRING *new_db_name,
                     bool force_switch);

bool mysql_opt_change_db(THD *thd,
                         const LEX_CSTRING *new_db_name,
                         LEX_STRING *saved_db_name,
                         bool force_switch,
                         bool *cur_db_changed);
bool my_dboptions_cache_init(void);
void my_dboptions_cache_free(void);
bool check_db_dir_existence(const char *db_name);
int load_db_opt(THD *thd, const char *path, Schema_specification_st *create);
int load_db_opt_by_name(THD *thd, const char *db_name,
                         Schema_specification_st *db_create_info);
CHARSET_INFO *get_default_db_collation(THD *thd, const char *db_name);
bool my_dbopt_init(void);
void my_dbopt_cleanup(void);

void drop_database_objects(THD *thd, const LEX_CSTRING *path,
                           const LEX_CSTRING *db,
                           bool rm_mysql_schema);
my_bool rm_dir_w_symlink(const char *org_path, my_bool send_error);
#define MY_DB_OPT_FILE "db.opt"

#endif /* SQL_DB_INCLUDED */