資料庫統計

1.統計資料庫中標的欄位資訊(欄位名字,欄位約束,欄位型別,欄位註釋等,建表的資訊都儲存在information_schema資料庫中,這個資料庫是mysql預設就有的,查詢sql語句如下(只需要把表名稱換成自己的表名即可執行):

USE information_schema;
SELECT
    C.COLUMN_NAME AS '欄位名',
    C.COLUMN_TYPE AS '資料型別',
    C.IS_NULLABLE AS '允許為空',
    C.EXTRA AS 'PK',
    C.COLUMN_COMMENT AS '欄位說明'
FROM
     COLUMNS C
INNER JOIN TABLES T ON C.TABLE_SCHEMA = T.TABLE_SCHEMA
AND C.TABLE_NAME = T.TABLE_NAME
WHERE
T.TABLE_NAME='表名稱'