【正文】 您希望能夠收回交易。但可能是其他主要功能，你會漏掉回滾/提交的功能。關于GPL的實際情況和虛構(gòu)GNU通用公共許可證可能是現(xiàn)存最被歪曲的文件之一，基礎知識分解如下： ，任何人都可以免費復制它，無論以源碼或可執(zhí)行形式或者把它交給其他任何人。s why, as you go through the text, you will see how to incorporate the best practices and how to avoid the pitfalls of convenience when projects get stressful. JSP itself is an evolutionary step along the path that started with the first static Web servers, moved through CGIenabled servers, and finally the first generation of scriptenabled servers. JSP is less a Web server with a Java ponent than it is a Java engine that understands the Web.JSP grew out of Java servlets. Servlets allow the developer to handle the ining Web requests using a Java program that has access to all the normal information that a Common Gateway Interface (CGI) program would. In addition, the servlet has access to sessionpersistent objects. These are Java objects that are associated with a specific user session and can be used to store state between requests. Servlet programming was a major step forward in allowing developers to write wellstructured modular Web applications using an objectoriented language. It also solved the problem of state persistence, allowing more information to reside on the server during a transaction and less to have to pass back and forth between the user and the server. Servlets still suffered from one major problem. Because they eventually need to spit out HTML, the HTML coding had to be embedded in the servlet code. This led to code fragments like the one shown here: (HTML\nHEAD\nTITLEThank you for Registering/TITLE/HEAD\n)。s account and enter a record into the shipping table so that you39。s a free solution out there if they aren39。re not selling the site itself to a third party as a product. (Consulting panies fall into a weird quasispace, but no one has gone after them for using GPL software to date.)Why is it good to support this movement? There are two sides to this answer: one technical and one political. Technically, it39。 CREATE TABLE PURCHASE ( USERID FOREIGN KEY USER(USERID), ITEM INTEGER, QUANTITY INTEGER)。原文出處《MySQL and JSP Web applications 》作者：James TurnerMySQL and JSP Web applicationsJSP developers encounter unique problems when building web applications that require intense database connectivity. MySQL and JSP Web Applications addresses the challenges of building datadriven applications based on the JavaServer Pages development model. MySQL and JSP Web Applications begins with an overview of the core technologies required for JSP database developmentJavaServer Pages, JDBC, and the database schema. The book then outlines and presents an Internet merce application that demonstrates concepts such as receiving and processing user input, designing and implementing business rules, and balancing the user load on the server. Through the JDBC (Java DataBase Connector), the developer can municate with most mercial databases, such as Oracle. The solutions presented in MySQL and JSP Web Applications center on the open source tools MySQL and Tomcat, allowing the reader an affordable way to test applications and experiment with the book39。作為一個學習工具，兩者的結(jié)合幾乎是“參考實現(xiàn)“他們（JSP和SQL）各自的協(xié)議。例如，假設你有一個像這樣的數(shù)據(jù)庫表：CREATE TABLE USER ( USERID INTEGER, FIRST_NAME VARCHAR(80), LAST_NAME VARCHAR(80))。 Web服務器是了不起的創(chuàng)造，但他們是一個有點像白癡專家。JS