我正在构建一个连接到多个 Oracle 数据库的应用程序。 连接到内部网络上的数据库没有问题,但我需要连接到 Oracle 云上托管的数据库。 在 SQL Developer 中,连接是使用 Oracle Wallet 建立的,但我实际上不知道如何在 C# 中使用钱包。 一个例子将非常感激。
****编辑
我至少让它能够识别我的 TNS 条目,但我遇到了一个无法取得任何进展的问题。 这是我的代码;
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();
}
}
}
并将其添加到我的 App.config 中;
<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>
我遇到的错误是;
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
我尝试以我能想到的各种方式更新 app.config WALLET_LOCATION 条目以及钱包中的 sqlnet.ora 文件(我认为这是一个转移注意力的事情,因为 app.config 似乎表明要覆盖它),但我可以'不要克服这个错误。 即使是指向我如何查看错误中引用的“String walletFile”变量的值的指针也将不胜感激。
这里有示例
第一个选项:
WALLET_LOCATION=(SOURCE=(METHOD=file)(METHOD_DATA=(DIRECTORY=<PATH_TO_WALLET_DIRECTORY>)))
第二个选项:
<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>
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);
}
C#
//Install Oracle.ManagedDataAccess.Core NuGet Package
OracleConnection conn = new OracleConnection("Data Source=SCOTT; User ID=/");
conn.Open();
tnsnames.ora
SCOTT =
(DESCRIPTION = (ADDRESS_LIST = (ADDRESS =
(PROTOCOL=TCP)(HOST = 192.168.1.100)(PORT = 1521)
))(CONNECT_DATA = (SERVICE_NAME = MY_SERVICE)))
sqlnet.ora
wallet_location = (source = (method = file)
(method_data=(directory = C:\scott_wallet))
)
SQLNET.WALLET_OVERRIDE=TRUE
钱包创建:
mkstore -wrl scott_wallet -create
mkstore -wrl scott_wallet -createCredential SCOTT SCOTT
当钱包中使用的别名在
tnsnames.ora
文件中没有匹配条目时,我也遇到了这个问题。
值得检查数据源
mytns
确实存在于tnsnames.ora
中,并且在您的钱包中,条目的名称与tns名称匹配,因此在本例中mytns
。
对于.Net core 8
OracleConnection oracleConnection= new OracleConnection();
oracleConnection.WalletLocation = @"<PATH OF WALLET FILE, ONLY DIRECTORY>";
oracleConnection.SqlnetWalletOverride = true;
oracleConnection.ConnectionString = @"DATA SOURCE=<TNSNAMES ENTRY, OR DIRECT CONNECTION PARAMETERS>;USER ID=/;";
oracleConnection.TnsAdmin = @"<PATH TO TNS_ADMIN IF USED>";
oracleConnection.Open();
备注:
仅使用钱包文件的目录 您需要指定 SqlnetWalletOverride 参数 您可以更改默认数据库 我正在尝试使其在 EFCore 上运行,如果我找到解决方案,我会发布解决方案