项目解析- JspLibrary - part3

Posted 2020-07-31 kakaisgood

CRUD

read：

String sql = "select b.*,c.name as bookcaseName,p.pubname as publishing,t.typename from tb_bookinfo b left join tb_bookcase c on b.bookcase=c.id join tb_publishing p on b.ISBN=p.ISBN join tb_booktype t on b.typeid=t.id where b."
                + f + "=‘" + key + "‘";
        System.out.println("查询借阅信息时的SQL：" + sql);
        ResultSet rs = conn.executeQuery(sql);
        try {
            if (rs.next()) {
                bookForm = new BookForm();
                bookForm.setBarcode(rs.getString(1));
}

 

insert:

sql = "Insert into tb_bookinfo (barcode,bookname,typeid,author,translator,isbn,price,page,bookcase,inTime,operator) values(‘"
                        + bookForm.getBarcode()
                        + "‘,‘"
                        + bookForm.getBookName()+ "‘)";
                falg = conn.executeUpdate(sql);
                System.out.println("添加图书的SQL：" + sql);

update:

String sql = "Update tb_bookinfo set typeid=" + bookForm.getTypeId()
                + ",author=‘" + bookForm.getAuthor() + "‘,translator=‘"
                + bookForm.getTranslator() + "‘,isbn=‘" + bookForm.getIsbn()
                + "‘,price=" + bookForm.getPrice() + ",page="
                + bookForm.getPage() + ",bookcase=" + bookForm.getBookcaseid()
                + " where id=" + bookForm.getId() + "";
        int falg = conn.executeUpdate(sql);

delete:

String sql = "UPDATE tb_bookinfo SET del=1 where id="
                + bookForm.getId() + "";
        int falg = conn.executeUpdate(sql);
        System.out.println("删除时的SQL：" + sql);