asp and javascript: sql server export data to csv and to xls

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<%@LANGUAGE="JAVASCRIPT" CODEPAGE="65001"%>
<%
//塗聚文
//20131021
 
function getData(connectionString, sql){
    var result = null;
    var adStateOpen = 1;
    var connection = new ActiveXObject("ADODB.CONNECTION");
    try{
        connection.Open(connectionString);
    } catch(e1){
        return null;
    }
    if (connection.State !== adStateOpen) {
        return null;
    }
    try{
        var recordset = connection.Execute(sql);
    } catch(e2){
        return null;
    }
    if (!recordset.EOF) {
        result = recordset.GetRows().toArray();
        recordset.Close();
    }
    recordset = null;
    connection.Close();
    connection = null;
    return result;
}
 
 
function writeCsvHttpHeaders(filename){
    Response.ContentType = "text/csv";
    Response.Charset = "utf-8";
    Response.AddHeader("Content-Disposition",
            "attachment; filename="+filename+".csv");
}
 
function writeXlsHttpHeaders(filename){
    Response.ContentType = "application/vnd.ms-excel";
    Response.Charset = "utf-8";
    Response.AddHeader("Content-Disposition",
            "attachment; filename="+filename+".xls");
}
 
function getXlsStart(){
    return ""
    + "<html>\n"
    + "<head>\n"
    + "<meta http-equiv=\"Content-Type\" "
    + "content=\"text/html; charset=UTF-8\">\n"
    + "<style type=\"text/css\">\n"
    + "html, body, table {\n"
    + "    margin: 0;\n"
    + "    padding: 0;\n"
    + "    font-size: 11pt;\n"
    + "}\n"
    + "table, th, td { \n"
    + "    border: 0.1pt solid #D0D7E5;\n"
    + "    border-collapse: collapse;\n"
    + "    border-spacing: 0;\n"
    + "}\n"
    + "</style>\n"
    + "</head>\n"
    + "<body>\n"
    + "<table>\n"
    + "";
}
 
function getXlsEnd(){
    return ""
    + "</table>\n"
    + "</body>\n"
    + "</html>"
    + "";
}
 
function csvEscape(val){
    if (typeof val === "number") {
        return val.toString(10).replace(".", ",");
    } else if (typeof val === "string") {
        if (val.indexOf("\"") !== -1) {
            return "\""+val.replace(/"/g, "\"\"")+"\"";
        } else if (val.indexOf(";") !== -1) {
            return "\""+val+"\"";
        } else {
            return val;
        }
    } else if (val === null) {
        return "#NULL#";
    } else if (val === undefined) {
        return "#UNDEFINED#";
    } else {
        return "#ERROR#";
    }
}
 
function writeCsv(filename, data, columnCount){
    writeCsvHttpHeaders(filename);
    // utf-8 BOM (very important for special characters)
    Response.Write("\uFEFF");
    for (var i=0, il=data.length; i<il; i+=columnCount) {
        for (var j=0; j<columnCount; j++) {
            Response.Write(csvEscape(data[i+j]));
            if (j !== columnCount-1) {
                Response.Write(";");
            }
        }
        Response.Write("\n");
        // prevent Response Buffering Limit Exceeded
        if (i % 1000 === 0) {
            Response.Flush();
        }
    }
}
 
function xlsEscape(val){
    if (typeof val === "number") {
        return val.toString(10).replace(".", ",");
    } else if (typeof val === "string") {
        return Server.HTMLEncode(val);
    } else if (val === null)  {
        return "#NULL#";
    } else if (val === undefined)  {
        return "#UNDEFINED#";
    } else {
        return "#ERROR#";
    }
}
 
function writeXls(filename, data, columnCount){
    writeXlsHttpHeaders(filename);
    Response.Write(getXlsStart());
    for (var i=0, il=data.length; i<il; i+=columnCount) {
        Response.Write("<tr>");
        for (var j=0; j<columnCount; j++) {
            Response.Write("<td>");
            Response.Write(xlsEscape(data[i+j]));
            Response.Write("</td>");
        }
        Response.Write("</tr>\n");
        // prevent Response Buffering Limit Exceeded
        if (i % 1000 === 0) {
            Response.Flush();
        }
    }
    Response.Write(getXlsEnd());
}
 
function main(){
    var filetype ="Excel" ' Request.QueryString("filetype")();
    var connectionString = "Provider=SQLOLEDB.1;"
    + "Data Source=188.68.218.86;"
    + "User ID=sa;"
    + "Password=2011intranet;"
    + "Initial Catalog=intranet";
    var sql = ""
    + "SELECT * \n"
    '+ ", B_Name \n"
    '+ ", B_EnglishName \n"
    + "FROM branch \n"
    + ";";
    var filename = "filename";
    var columnCount = 3;
     
    var data = getData(connectionString, sql);
    if (data !== null) {
        Response.Clear();
        if (filetype == "csv") {
            writeCsv(filename, data, columnCount);
        } else {
            writeXls(filename, data, columnCount);
        }
    } else {
        Response.Write("Error, no data found");
    }
    Response.End();
}
 
main();
 
%>

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