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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sh-3ll 1.0
DIR:/usr/share/mysql/
Upload File :
Current File : //usr/share/mysql/mysql_performance_tables.sql
--
-- PERFORMANCE SCHEMA INSTALLATION
-- Note that this script is also reused by mysql_upgrade,
-- so we have to be very careful here to not destroy any
-- existing database named 'performance_schema' if it
-- can contain user data.
-- In case of downgrade, it's ok to drop unknown tables
-- from a future version, as long as they belong to the
-- performance schema engine.
--

set @have_old_pfs= (select count(*) from information_schema.schemata where schema_name='performance_schema');

SET @cmd="SET @broken_tables = (select count(*) from information_schema.tables  where engine != 'PERFORMANCE_SCHEMA' and table_schema='performance_schema')";

-- Work around for bug#49542
SET @str = IF(@have_old_pfs = 1, @cmd, 'SET @broken_tables = 0');
PREPARE stmt FROM @str;
EXECUTE stmt;
DROP PREPARE stmt;

SET @cmd="SET @broken_views = (select count(*) from information_schema.views where table_schema='performance_schema')";

-- Work around for bug#49542
SET @str = IF(@have_old_pfs = 1, @cmd, 'SET @broken_views = 0');
PREPARE stmt FROM @str;
EXECUTE stmt;
DROP PREPARE stmt;

SET @broken_routines = (select count(*) from mysql.proc where db='performance_schema');

SET @broken_events = (select count(*) from mysql.event where db='performance_schema');

SET @broken_pfs= (select @broken_tables + @broken_views + @broken_routines + @broken_events);

--
-- The performance schema database.
-- Only drop and create the database if this is safe (no broken_pfs).
-- This database is created, even in --without-perfschema builds,
-- so that the database name is always reserved by the MySQL implementation.
--

SET @cmd= "DROP DATABASE IF EXISTS performance_schema";

SET @str = IF(@broken_pfs = 0, @cmd, 'SET @dummy = 0');
PREPARE stmt FROM @str;
EXECUTE stmt;
DROP PREPARE stmt;

SET @cmd= "CREATE DATABASE performance_schema character set utf8mb3";

SET @str = IF(@broken_pfs = 0, @cmd, 'SET @dummy = 0');
PREPARE stmt FROM @str;
EXECUTE stmt;
DROP PREPARE stmt;