C# 使用钱包连接到 Oracle 数据库

Question

I am building an app that connects to several Oracle databases. I have no problem connecting to databases on our internal.network, but I need to connect to one on that is hosted on the Oracle Cloud. In SQL Developer the connection is made using an Oracle Wallet, but I have literally no idea how to utilize the wallet in C#. An example would be really appreciated.

****Edit

I have at least got it to recognise my TNS entries, but I have hit a problem that I can make no progress on. Here is my code;

using System;
using System.Data;
using System.Data.Common;
using Oracle.ManagedDataAccess.Client;

class GetSchemaSample
{
    static void Main(string[] args)
    {
        string constr = "User Id=/; Data Source=mytns;";
        string ProviderName = "Oracle.ManagedDataAccess.Client";

        DbProviderFactory factory = DbProviderFactories.GetFactory(ProviderName);

        using (DbConnection conn = factory.CreateConnection())
        {
            try
            {
                conn.ConnectionString = constr;
                conn.Open();

                DataTable dtSchema = conn.GetSchema();
                dtSchema.WriteXml(ProviderName + "_Schema.xml");
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Console.WriteLine(ex.StackTrace);
            }
            Console.ReadLine();
        }
    }
}

And added this to my App.config;

  <oracle.manageddataaccess.client>
    <version number="*">
      <settings>
        <setting name="WALLET_LOCATION" value="c:\Oracle" />
        <setting name="SQLNET.WALLET_OVERRIDE" value="true" />
      </settings>
    </version>
  </oracle.manageddataaccess.client>

The error I am encountering is;

The path is not of a legal form.
   at System.IO.Path.LegacyNormalizePath(String path, Boolean fullCheck, Int32 maxPathLength, Boolean expandShortPaths)
   at System.IO.Path.GetFullPathInternal(String path)
   at System.IO.Path.GetFullPath(String path)
   at System.IO.FileSystemWatcher.StartRaisingEvents()
   at OracleInternal.ConnectionPool.OracleConnectionDispenser`3.CreateSEPSFileWatcher(String walletPath, String walletFile)
   at OracleInternal.ConnectionPool.OraclePoolManager.InitializeSEPSCredentials()
   at OracleInternal.ConnectionPool.OraclePoolManager.Initialize(ConnectionString cs, OracleConnection con)
   at OracleInternal.ConnectionPool.OracleConnectionDispenser`3.GetPM(ConnectionString cs, OracleConnection con, PM conPM, ConnectionString pmCS, SecureString securedPassword, SecureString securedProxyPassword, Boolean& bAuthenticated, Boolean& newPM)
   at OracleInternal.ConnectionPool.OracleConnectionDispenser`3.Get(ConnectionString cs, PM conPM, ConnectionString pmCS, SecureString securedPassword, SecureString securedProxyPassword, OracleConnection connRefForCriteria)
   at Oracle.ManagedDataAccess.Client.OracleConnection.Open()
   at GetSchemaSample.Main(String[] args) in C:\Users\peter.holliday\source\repos\OACTesting\Connection1.cs:line 39

I have tried updating app.config WALLET_LOCATION entry in every way I can think of and also the sq.net.ora file in the wallet (I assume this is a red herring as app.config seems to indicate overriding that), but I can't get past this error. Even a pointer to how I can see what the value of "String walletFile" variable referred to in the error is would be appreciated.

Answer 1

here you have examples

---

Managed Assemby/Driver

1. With managed assemby you have 2 options:

First option:

• put 2 files (sqlnet.ora, tnsnames.ora) from Wallet.zip to your executable path (bin/Debug)
• edit sqlnet.ora and change 'DIRECTORY' variable

WALLET_LOCATION=(SOURCE=(METHOD=file)(METHOD_DATA=(DIRECTORY=<PATH_TO_WALLET_DIRECTORY>)))

Second option:

• add XML to your app.config

<oracle.manageddataaccess.client>
  <version number="*">
    <settings>
      <setting name="TNS_ADMIN" value="PATH_TO_WALLET_DIRECTORY"/>
      <setting name="Wallet_Location" value="PATH_TO_WALLET_DIRECTORY"/>  
    </settings>
  </version>
</oracle.manageddataaccess.client>

---

Unmanaged Assemby/Driver

• put 2 files (sqlnet.ora, tnsnames.ora) from Wallet.zip to your executable path (bin/Debug)
• edit sqlnet.ora and change 'DIRECTORY' variable (same as manged driver, option first)

---

Connecting to DB

public static OracleConnection TakeMeToTheClouds()
{
    var user = "admin";
    var password = "YOUR PASSWORD";
    var ds = "THIS YOU FIND IN 'tnsnames.ora' FILE";

    var connectionString = $"User Id={user};Password={password};Data Source={ds};";
    return new OracleConnection(connectionString);
}

Answer 2

I have also encountered this issue when the alias used in the wallet does not have a matching entry in the tnsnames.ora file.

It is worth checking that the datasource mytns does indeed exist in tnsnames.ora , and that in your wallet, the name of the entry matches the tns name, so in this case mytns .