oracle - How do I fix OCIServerAttach failing with DATABASE error: ORA-12541: TNS:no listener? -


i have client on windows machine , oracle server on centos virtual machine.

i able connect pc server using sqlplus using following string:

sqlplus myname/mypassword@ipaddress/xe

my tnsnames.ora files is:

# tnsnames.ora network configuration file:  xe =   (description =     (address = (protocol = tcp)(host = ipaddress)(port = 1521))     (connect_data =       (server = dedicated)       (service_name = xe)     )   )  extproc_connection_data =   (description =     (address_list =       (address = (protocol = ipc)(key = extproc_for_xe))     )     (connect_data =       (sid = plsextproc)       (presentation = ro)     )   )

however, when try use same connection information application connections fails in ociserverattach call.

here code framework:

ocienvcreate(&tmpenv,                 oci_object | oci_threaded,                 null,                 null,                 null,                 null,                 0,                 null);  ocisessionbegin(servicecontexthandle_, errorhandle_, sessionhandle_, oci_cred_rdbms, oci_default);   ocihandlealloc( (dvoid *) environmenthandle_, (dvoid **) &servicecontexthandle_, oci_htype_svcctx, (size_t) 0, (dvoid **) 0); ocihandlealloc( (dvoid *) environmenthandle_, (dvoid **) &serverhandle_, oci_htype_server, (size_t) 0, (dvoid **) 0); ocihandlealloc( (dvoid *) environmenthandle_, (dvoid **) &errorhandle_, oci_htype_error, (size_t) 0, (dvoid **) 0); ocihandlealloc( (dvoid *) environmenthandle_, (dvoid **) &sessionhandle_, oci_htype_session, (size_t) 0, (dvoid **) 0);   /* here path std::string contains ipaddress followed '/xe'*/  result =  ociserverattach( serverhandle_, errorhandle_, (text *)path_.c_str(), (sb4)path_.length(), 0);

the ipaddress matches ipaddress in tnsnames.ora , listener.ora file. there no port number being used intended use default 1521.

to best of knowledge listeners set , working correctly otherwise not able connect via sqlplus. oracle_home value expect. install directory in path.

anyone have ideas of might wrong?


Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more