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#define SQL_CREATE_TABLE "Create table if not exists User_info(id INTEGER primary key autoincrement, UserName char(20), Password char(20), Level integer NOT NULL)"

#define SQL_INSERT_DATA "Insert into User_info (UserName, Password, Level) values ('%s', '%s', '%d')"

#define SQL_QUERY_DATA "Select * from User_info"

Insert into User_info (UserName, Password, Level) values ('大', 'd', 123)
DELETE FROM User_info WHERE id = 6
SELECT * FROM User_info WHERE id = 1
UPDATE User_info SET Level = 888 WHERE id = 7;