Asp.net Delete news and delete image design ideas

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Recently, I encountered a problem where the text and text are mixed in the news publishing function. However, when I delete the news, the pictures in the news are not deleted at the same time, because most HTML editors only support uploading images, which can be used to browse images on the server, but the effect is poor, how can they retrieve pictures in news, then, what about "articles" based on these images?

Through data collection, I have summarized a set of ideas for reference only, as shown below:

First, design the news table (I only select the key fields), ID, title, details, publishtime, publishman, newsimg (This field records the pictures in the news, the field length is longer, because it records the complete URL of the image. Of course, you can only save the image name, but in some cases, the image cannot be displayed)

The database is well designed, and then the image is taken. Here I use a regular expression to retrieve it.

// Return all the pictures in the news, separated by | Public String mygetimgurl (string text) {stringbuilder STR = new stringbuilder (); string PAT = @ "] * \ s * SRC \ s * = \ s * ([']?) (? <URL> \ s + )'? [^>] *> "; RegEx r = new RegEx (Pat, regexoptions. compiled); match M = R. match (text. tolower (); While (M. success) {group G = m. groups [2]; Str. append (g ). append ("|"); // G is the complete URL of the image. M = m. nextmatch ();} return Str. tostring (). replace ("\"",""). trimend ('|');} // insert news protected void button#click (Object sender, eventargs e) {cj_dboperater.cj.sqlconn_str = "Server = localhost; database = piclinktonews; uid = sa; pwd = ovenjackchain "; string STR =" insert into news values ('{0}', '{1}', '{2}', '{3 }', '{4}') "; // txtcontent. text is the content of the HTML editor, which is in the HTML format of cj_dboperater.cj. SQL _executenonquery (string. format (STR, txttitle. text, txtcontent. text, datetime. now. tostring (), "admin", mygetimgurl (this. txtcontent. text); // insert successful}

Now we have inserted a piece of news and put the image URL in the news into the newsimgs field.

The next thing is easy to do.

For example, if I want to make a flash image scroll effect, the image is a news image. clicking an image will jump to the news, then the focus is how to retrieve the image.

It's easy, because we have put the image in the newsimgs field, and we only need SQL statements.

 

DataTable dt = CJ_DBOperater.CJ.SQL_ReturnDataTable("select top 4 NewsImgs from news where NewsImgs!=''");for (int i = 0; i < dt.Rows.Count; i++){if (dt.Rows[i][0].ToString().Contains('|'))Response.Write(dt.Rows[i][0].ToString().Substring(0, dt.Rows[i][0].ToString().IndexOf('|')) + "<br />");elseResponse.Write(dt.Rows[i][0].ToString()+"<br />");}

// Here, only the first image is taken for each news article (if there is an image in the News)

OK.

The image is taken out, so it is OK to delete the news and delete the picture.

Of course, if you only delete news and images, you do not need the newsimgs field.

Source code download: http://download.csdn.net/source/2119062