mysql 表信息 类似于sqlserver中的sysobjects syscolumns sysproperties等

create view SystemInfo
as
SELECT table_name,ordinal_position as colorder,column_name as colName,
  case extra when 'auto_increment' then 1 else 0 end as IsIdentity,
  case column_key when 'pri' then 1 else 0 end as isKey,
  data_type as type,0 as bits,
  case  when character_maximum_length is NULL then numeric_precision else character_maximum_length end as length,
  numeric_scale as digit,
  case is_nullable when 'yes' then 0 else 1 end as isnullable,
  column_default as defaultValue,
  column_comment as memo,
  concat(table_name,'.',column_name) as col
FROM information_schema.COLUMNS ; 

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