SQL架构信息读取

--架构：
select * from information_schema.SCHEMATA
--表：
select table_name from information_schema.tables
--列：
select table_name from information_schema.COLUMNS
--表约束：
select * from information_schema.TABLE_CONSTRAINTS
--键：
select * from information_schema.KEY_COLUMN_USAGE
--存储过程：
select * from information_schema.ROUTINES
--视图：
select * from information_schema.VIEWS

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