试用EF开发WEB应用程序(11): 在线留言系统

题记：用“易语言.飞扬”（EF）开发WEB应用程序，此前还没有先例。但因为EF本地开发包（EFNDK）已经发布，用C/C++开发一个EF类库，使其支持EF开发WEB应用程序，应该并非难事。当然也可想而知，其中必有诸多难点有待解决。此系列文章，为本人探索过程之记录，对外人未必有多大价值。如有网友乐观其事，还请理性待之。作者：liigo。转载请务必注明出处：http://blog.csdn.net/liigo/。在线留言。

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试用EF开发WEB应用程序(11):在线留言系统

在线留言系统入口 （非常感谢好友龚辟愚提供网络服务器）

此留言板的“易语言.飞扬”（EF）完整源代码如下：

引入fastcgi,sqlite,工具;

公开类启动类
{
静态Sqlite数据库_db;

公开静态启动()
{
_db = new Sqlite数据库();
_db.打开( " ../db/msgboard.file " , true );
if (_db.表是否存在( " messages " ) == false )
createTable();

FCGIfcgi = new FCGI;
while (fcgi.Accept() >= 0 )
{
if (fcgi.REQUEST_METHOD.到小写() == " post " )
fcgi.ReadContentAsQueryString();

文本html = html_template.替换全部( " $(title) " , " 留言板（由EF开发） " );

if (fcgi.QUERY_STRING( " name " ) != "" || fcgi.QUERY_STRING( " message " ) != "" )
insertMessage(fcgi);

// deleteallmessages
if (fcgi.QUERY_STRING( " cleandb " ) == " byliigo " )
_db.执行SQL( " deletefrommessageswhere1=1 " );

stringmessages; int count;
(messages,count) = listAllMessages();
html = html.替换( " $(messages) " ,messages);
html = html.替换( " $(count) " ,count.到文本());

fcgi.Output(html.到UTF8());
}
_db.关闭();
}

private static createTable()
{
Sqlite表结构tdef = new Sqlite表结构();
tdef.添加字段( " id " ,Sqlite字段类型.主键整数);
tdef.添加字段( " name " ,Sqlite字段类型.文本);
tdef.添加字段( " message " ,Sqlite字段类型.文本);
tdef.添加字段( " ip " ,Sqlite字段类型.文本);
tdef.添加字段( " date " ,Sqlite字段类型.文本);
_db.创建表( " messages " ,tdef);
}

private static boolinsertMessage(FCGIfcgi)
{
private static stringGetDate()
{
日期时间类t = new 日期时间类();
return t.年().到文本() + " / " + t.月().到文本() + " / " + t.日().到文本() + " " + t.时().到文本() + " : " + t.分().到文本() + " : " + t.秒().到文本();
}

stringname = fcgi.QUERY_STRING( " name " );
if (name == "" )name = " EF爱好者 " ;
stringmessage = fcgi.QUERY_STRING( " message " );
if (message == "" )message = " 他/她很懒，什么都没说:) " ;
stringip = fcgi.REMOTE_ADDR;
stringdate = GetDate();

stringsql = " insertintomessages(name,message,ip,date)values(' " + name + " ',' " + message + " ',' " + ip + " ',' " + date + " ') " ;
return _db.执行SQL(sql);
}

private static string, int listAllMessages()
{
private static stringfixHTMLChars(strings)
{
s = s.替换全部( " & " , " & " );
s = s.替换全部( " < " , " &lt; " );
s = s.替换全部( " > " , " &gt; " );

// someonenotethis?:)
s = s.替换全部( " [b] " , " <b> " );s = s.替换全部( " [/b] " , " </b> " );
s = s.替换全部( " [red] " , " <fontcolor="red"> " );s = s.替换全部( " [/red] " , " </font> " );
s = s.替换全部( " [blue] " , " <fontcolor="blue"> " );s = s.替换全部( " [/blue] " , " </font> " );
s = s.替换全部( " [green] " , " <fontcolor="green"> " );s = s.替换全部( " [/green] " , " </font> " );
return s;
}

private static stringformatMessage(stringname,stringmessage,stringip,stringdate)
{
static stringmsg_template = " <p>$(name)($(ip))于$(date)留言：$(message)</p> " ;
stringmsg = msg_template.替换( " $(name) " ,name);
msg = msg.替换( " $(ip) " ,ip);
msg = msg.替换( " $(message) " ,fixHTMLChars(message));
msg = msg.替换( " $(date) " ,date);
return msg;
}

Sqlite记录集query = new Sqlite记录集(_db, " select*frommessagesorderby_ROWID_desc " );
stringmessages = "" ;
int count = 0 ;
if (query.打开())
{
count = query.取记录数();
while (query.到下一记录())
{
messages += formatMessage(query.读字段值( " name " ,Sqlite字段类型.文本),query.读字段值( " message " ,Sqlite字段类型.文本),query.读字段值( " ip " ,Sqlite字段类型.文本),query.读字段值( " date " ,Sqlite字段类型.文本));
}
}
return (messages,count);
}

常量文本html_template = [ " Content-type:text/html

< html >< head >
< metahttp - equiv = " content-type " content = " text/html;charset=utf-8 " >
< title > $(title) </ title >
</ head >
< body >
< h1 > $(title) </ h1 >
< hr ></ hr >

< formmethod = " post " >
< p > 姓名： < inputtype = " text " name = " name " size = 20 /></ p >
< p > 留言： < inputtype = " text " name = " message " size = 100 /></ p >

< p >< inputtype = " submit " value = " 提交留言 " ></ input ></ p >
</ form >

< p >< ahref = " msgboard.txt " target = " _blank " > 此留言板的EF源代码 </ a ></ p >

< hr ></ hr >
< h1 > 所有留言（共$(count)条） </ h1 >

$(messages)

< hr ></ hr >
< p > byliigo, < ahref = " http://blog.csdn.net/liigo/ " > http: // blog.csdn.net/liigo/</a></p>
</ body >
</ html >
" ];
}