数据库中创建图书馆管理系统的三个视图，一个唯一性索引，一个触发器，一个存储过程的SQL语句

下面是创建图书馆管理系统的三个视图、一个唯一性索引、一个触发器和一个存储过程的 SQL 语句：

1. 创建读者信息视图：

CREATE VIEW reader_info_view AS
SELECT reader_id, reader_name, reader_gender, reader_age, reader_contact
FROM reader_info;

2. 创建图书信息视图：

CREATE VIEW book_info_view AS
SELECT book_id, book_name, book_author, book_publisher, book_pubdate, book_price
FROM book_info;

3. 创建借阅记录视图：

CREATE VIEW borrow_record_view AS
SELECT borrow_id, reader_id, book_id, borrow_date, return_date, borrow_status
FROM borrow_record;

4. 为读者信息表中的读者编号列创建唯一性索引：

CREATE UNIQUE INDEX reader_id_index ON reader_info(reader_id);

5. 创建借阅记录表的触发器，自动更新图书信息表中的库存量：

CREATE TRIGGER update_book_stock AFTER INSERT ON borrow_record
FOR EACH ROW
UPDATE book_info SET book_stock = book_stock - 1 WHERE book_id = NEW.book_id;

6. 创建一个存储过程，用于查询某个读者所借阅的图书信息：

CREATE PROCEDURE find_borrowed_books(IN in_reader_id INT)
BEGIN
  SELECT book_info.book_name, book_info.book_author, borrow_record.borrow_date, borrow_record.return_date, borrow_record.borrow_status
  FROM book_info
  INNER JOIN borrow_record ON book_info.book_id = borrow_record.book_id
  WHERE borrow_record.reader_id = in_reader_id;
END;

以上SQL语句仅供参考，具体实现可能需要根据实际情况进行适当修改。