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JavaScript operates on the Oracle database example

  • 2020-05-12 02:12:27
  • OfStack

I am still a newbie in the IT world. I have not been working for a long time. However, with my eager to learn and my never-ending learning pace, I have also gained a lot in programming

JavaScript has to call the server-side code (C# or JAVA) via AJAX to interact with the database, but it was only recently discovered that JavaScript can interact directly with the database... The following is a simple example of loading data from the database into the interface (about JS operation data knowledge if you have any good advice I hope you can stay, we learn from each other, progress together)~~ 


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
 <TITLE> New Document </TITLE>
 <META NAME="Generator" CONTENT="EditPlus">
 <META NAME="Author" CONTENT="">
 <META NAME="Keywords" CONTENT="">
 <META NAME="Description" CONTENT="">
 <script type="text/javascript">
  function getData()
  {
    // define SQL statements 
    var sql = "select obj_id,obj_caption from mw_sys.mwt_om_obj where rownum<5000";
    // Create a new database connection object and a data set access object 
    var ConnDB = new ActiveXObject("ADODB.Connection");
    ConnDB.open("Provider=MSDAORA.1;Password=app;User ID=mw_app;Data Source=pms;Persist Security Info=True");
    var rs = new ActiveXObject("ADODB.Recordset");
    rs.ActiveConnection = ConnDB;
    rs.Open(sql);
    // traverse 
    var s;
    var rownum=0;
    var shtml="<table cellpadding=0; cellspacing=0; style='border:solid 1px gray;'><thead><td style='border:solid 1px gray; text-align:center;'> The line Numbers </td><td style='border:solid 1px gray; text-align:center;'> The text ID No. </td><td style='border:solid 1px gray;'> Professional code </td><tbody>";
    while(!rs.EOF)
    {
      shtml+="<tr><td style='border:solid 1px gray; text-align:center;'>";
      shtml+=rownum+1;
      shtml+="</td>";
      for(i = 0;i<rs.Fields.Count;++i)
      {
        shtml+="<td style='border:solid 1px gray; background-color:yellow;'>";
        shtml+=rs.Fields(i).value==null?" ":rs.Fields(i).value;
        shtml+="</td>";
      }
      shtml+="</tr>";
      rownum++;
      if(rownum==1000)
      break;
      rs.MoveNext();
    }
    shtml+="</tbody></table>";
    rs.close();
    ConnDB.close();
    document.getElementById("data").innerHTML=shtml;
  }
 </script>
 
 </HEAD>
 
 <BODY>
 <input type="button" value="Table" onclick="getData()"/>
 <div id="data">
 </div>
 </BODY>
</HTML>

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