vb.net - Parameterized SQL update query doesn't work -


i stuck hours , don't know do.
code doesn't work in updating student records using parameterized sql query in vb.net.

    dim result integer     cmd = new oledbcommand("update students set student_name=@name, address=@address, contact_no=@contact id_number=@id_number;", conn)     conn.open()     cmd.connection = conn     cmd.parameters.addwithvalue("@id_number", txt_idnumber.text)     cmd.parameters.addwithvalue("@name", txt_name.text.tostring)     cmd.parameters.addwithvalue("@address", txt_address.tostring)     cmd.parameters.addwithvalue("@contact", txt_contactno.text.tostring)     result = cmd.executenonquery()     if result = 1         msgbox("changes updated successfully.", vbinformation, "message")     else         msgbox("update unsuccessful.", vbcritical, "message")     end if     conn.close()

oledb doesn't recognize parameters name. in oledb parameters should added parameters collection in same order in have listed them in commandtext.

this means code tries update record id_number equal content of txt_contactno

just move parameter @id_number after adding first three

' no need use tostring on property of type string' cmd.parameters.addwithvalue("@name", txt_name.text) cmd.parameters.addwithvalue("@address", txt_address.text) cmd.parameters.addwithvalue("@contact", txt_contactno.text) cmd.parameters.addwithvalue("@id_number", txt_idnumber.text)

as side note, please aware of the problems of addwithvalue. handy shortcut pay price it


Comments

Post a Comment

Popular posts from this blog

Command prompt result in label. Python 2.7 -

i want put result(output) of shell command label. command works, label shows "0", however, in command prompt, result shown correctly, need showed in label. doing ubuntu. myg1 = button(root, text="rodyti informacija", command=lambda: gauti()) myg1.pack(side=bottom) def gauti(): imti = tekstas.get("1.0", "end-1c") info = subprocess.call("id '{imti}' ".format(imti=imti), shell=true) w = label(root, text= info) w.pack(side = bottom) subprocess.call() returns exit code of process created (in case 0 success). if want text output of process, should instead call subprocess.check_output() .
Read more

javascript - How do I use URL parameters to change link href on page? -

i change href value of link using url parameters. example: default <a id="dlink" href="link-1">link</a> but, when user goes https://url.com/?dlink=link-2 it swaps out link new link <a id="dlink" href="link-2">link</a> first need value url. if you're not using javascript framework can create function using jquery. please check get url parameter jquery or how query string values in js it. after that, element "a" id , set value there. $("#dlink").attr("href", hreffromparam);
Read more

amazon web services - AWS Route53 Trying To Get Site To Resolve To www -

so have domain nameservers pointed aws route 53. site hosted on ec2 instance , reachable resolves site.com, if input www.site.com. i'm curious how site resolve www.site.com. have under route53 domains hosted zone 2 additional record sets outside of ns , soa: a site.com ec2 elastic ip cname www.site.com ec2 public dns i can reach site using both site.com , www.site.com, resolve site.com. there way make if enter either, resolves www.site.com? at first, both should record set. a site.com ec2 elastic ip www.site.com ec2 elastic ip and need redirect setting in web server (nginx, apache, ..) following. (source: how redirect www non-www nginx on centos 7 ) redirect non-www www if want redirect users plain, non-www domain www domain, add server block: server { server_name example.com; return 301 $scheme://www.example.com$request_uri; } save , exit. configures nginx redirect requests "example.com" "www.example.com". not...
Read more