Oracle Managed ODP.NET can't find tnsnames.ora

问题

My managed ODP.net webapp works locally but when deploying it to a server, it fails with the error:

"TNS:listener does not currently know of service requested in connect descriptor"

From looking around, it seems like this is because it can't get to the tnsnames.ora file.

I have tried the following with no success:

Placing a tnsnames.ora file (the same one that works locally) into an [oracle home][product]...\network\admin folder.
Setting a TNS_ADMIN setting in the Managed ODP's web.config section pointing to the environment variable.
Setting the TNS_ADMIN setting in the Managed ODP's web.config section pointing directly to the tnsnames.ora file.

On the server, attempting to run tnsping yields error TNS-03502: Message 3502 not found; No message file for product=NETWORK, facility=TNS

What am I missing?

回答1:

Try using a connection string that doesn't depend on tnsnames.ora, such as:

Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=MyHost)(PORT=MyPort)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=MyOracleSID)));User Id=myUsername;Password=myPassword;

回答2:

Just adding the tns_admin path to web.config or app.config and point it to the folder where you have a tnsnames.ora file should work.

<oracle.manageddataaccess.client>
    <version number="*">
      <settings>
        <setting name="tns_admin" value="E:\oracle11\product\11.2.0\client_1\network\admin" />
      </settings>
    </version>
</oracle.manageddataaccess.client>

回答3:

An old post, but I've been looking for a similar solution.

It occurs to me that as it looks like ODP.net doesn't allow for specifying a TNS file path, then if you are aware of the file path, just read the file programmatically and set the contents to the DataSource field of the ConnectionStringBuilder. Not ideal, but a reasonable workaround.

回答4:

I was after the same exact thing I ended up doing some regex on the TNSNAMES file. Once you've done the regex on the file you should be able to bring that into an object in Powershell or C#

param($tnsnamesPath = 'c:\tns\tnsnames.ora',$username = 'user',$password = 'gotmehere', $connectionName = 'mustard', $query = 'Select sysdate from dual')
$simplySQLPath = (Get-Module -ListAvailable simplySQL).ModuleBase
if($simplySQLPath -and (test-path $tnsnamesPath -PathType Leaf) -and (![string]::IsNullOrEmpty($node)))
{
    [System.Reflection.Assembly]::LoadFile("$simplySQLPath\DataReaderToPSObject.dll") | OUT-NULL
    Import-Module SimplySql -Force
    $parsedTN = (get-content $tnsnamesPath -raw)  -replace '(.*\=.*|\n.*\=)(.*|\n.*)\(DESCRIPTION*.\=' ,'Data Source = (DESCRIPTION ='  
    $splitTN = $parsedTN -split '(?=.*Data Source = \(DESCRIPTION \=)' 
    $tnsnames = $splitTN |?{$_ -like "*$connectionName*"}
    $connstring = "$tnsnames;User Id=$username;Password=$password"
    try
    {
        Open-OracleConnection -ConnectionString $connstring -ConnectionName $connectionName
        $result = Invoke-SqlQuery -ConnectionName $connectionName -Query "$SQLQuery"
        Close-SqlConnection -ConnectionName $connectionName
    }
    catch
    {
        $_.exception
    }

}
Else
{
    if(!(test-path $tnsnamesPath -PathType Leaf -ErrorAction Ignore))
    {
        Throw "Check TNSnamesPath:  $tnsNamesPath"
    }
    else
    {
        Throw "Exeception SIMPLYSQL not found in module Path $($env:PSModulePath)"
    }
}
$result

I've blogged about this code here: https://powershellposse.com/2018/03/13/tnsnames-file-parsing/

来源：https://stackoverflow.com/questions/15275376/oracle-managed-odp-net-cant-find-tnsnames-ora

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