[英]cannot connect to oracle server from C#.net application
我正在嘗試連接到遠程Oracle服務器。 我的連接字符串 -
OdbcConnection con = new OdbcConnection();
con.ConnectionString = @"Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST= xxxx)(PORT=xxxxx))(CONNECT_DATA=(SERVER=dedicated)(SERVICE_NAME=abc.domain.com)));USER ID=user1;Password=pwd;";
我遇到錯誤 - “ERROR [IM002] [Microsoft] [ODBC驅動程序管理器]未找到數據源名稱且未指定默認驅動程序”(System.Data.Odbc.OdbcException)異常消息=“ERROR [IM002] [Microsoft] [ ODBC驅動程序管理器] 未找到數據源名稱且未指定默認驅動程序 “,Exception Type =”System.Data.Odbc.OdbcException“,Exception WinRT Data =”“
我根據我的TNSNAMES.ora指定了我的連接字符串
在TNSNAMES.ora中輸入我的數據庫是這樣的:
DB.WORLD=
(DESCRIPTION=
(ADDRESS=
(PROTOCOL=TCP)
(HOST= xxxx)
(PORT=xxxxx)
)
(CONNECT_DATA=
(SERVER=dedicated)
(SERVICE_NAME=abc.domain.com)
)
)
有人可以解釋錯誤。 請幫助/建議我的連接字符串是否出錯以及如何從我的Windows應用程序連接到Oracle服務器
首先使用nuget數據包管理器安裝odp.net.managed:
Install-Package odp.net.managed
odp.net.managed工作沒有預安裝的Oracle客戶端
下一個:
const string connectionString = @"Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST= xxxx)(PORT=xxxxx))(CONNECT_DATA=(SERVER=dedicated)(SERVICE_NAME=abc.domain.com)));USER ID=user1;Password=pwd;";
var connection = new OracleConnection(connectionString);
connection.Open();
如果你在應用程序文件夾中有tnsnames.ora:
const string connectionString = @"Data Source=DB.WORLD;USER ID=user1;Password=pwd;";
var connection = new OracleConnection(connectionString);
connection.Open();
或者如果tnsnames.ora在其他文件夾中:
Environment.SetEnvironmentVariable("TNS_ADMIN", @"path_to_tnsadmin.ora");
const string connectionString = @"Data Source=DB.WORLD;USER ID=user1;Password=pwd;";
var connection = new OracleConnection(connectionString);
connection.Open();
您需要使用OracleConnection
OracleConnection conn = new OracleConnection(connectionString);
轉到Connections Strings for Oracle
也許會找到一些幫助
使用以下代碼:
using System;
using Oracle.DataAccess.Client;
class ConnectionSample
{
static void Main()
{
OracleConnection con = new OracleConnection();
//using connection string attributes to connect to Oracle Database
con.ConnectionString = "User Id=scott;Password=tiger;Data Source=oracle";
con.Open();
Console.WriteLine("Connected to Oracle" + con.ServerVersion);
// Close and Dispose OracleConnection object
con.Close();
con.Dispose();
Console.WriteLine("Disconnected");
}
}
嘗試類似這樣的東西:
public class OracleOperations
{
OracleConnection oraConn = new OracleConnection();
private bool connStatus;
public OracleOperations()
{
connStatus = false;
connect();
}
~OracleOperations()
{
disconnect();
}
public bool getConnStatus()
{
return connStatus;
}
public void connect()
{
string connString = "User Id=xxxx; Password=yyyyy; Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=10.10.10.10)(PORT=1583))(CONNECT_DATA=(SERVER=dedicated)(SID=oracledb)))";
if (oraConn.State != ConnectionState.Open)
{
try
{
oraConn.ConnectionString = connString;
oraConn.Open();
Console.WriteLine("Successful Connection");
connStatus = true;
}
catch (Exception eOra)
{
Console.WriteLine(eOra.Message+ "Exception Caught");
connStatus = false;
throw eOra;
}
}
}
public void disconnect()
{
if (oraConn.State == ConnectionState.Open)
{
try
{
oraConn.Close();
connStatus = false;
Console.WriteLine("Connection Closed");
}
catch (Exception ex)
{
Console.WriteLine(ex.Message + "Exception Caught");
}
}
}
}
我會嘗試Tnsping實用程序,以確保您可以通過tnsnames.ora連接
嘗試將tnsnames.ora和sqlnet.ora放在應用程序的同一文件夾中,看看是否解決了這個問題。
使用Managed ODP.Net,有一個不支持LDAP查找的問題(例如LDAP.ora)
我創建了一個app.config文件,並像這樣配置了DB條目
<configuration>
<configSections>
<section name ="Environment" type="System.Configuration.NameValueSectionHandler" />
</configSections>
<Environment>
<add key ="CIT" value ="Password=pwd123;User ID=abc123;Data Source=db1;Persist Security Info=True;Provider=MSDAORA"/>
<add key ="SIT" value ="Password=pwd234;User ID=abc234;Data Source=db2;Persist Security Info=True;Provider=MSDAORA"/>
<add key ="UAT" value ="Password=pwd345;User ID=abc345;Data Source=db3;Persist Security Info=True;Provider=MSDAORA"/>
</Environment>
</configuration>
使用ConfigurationManager將該配置緩存到我的表單中(需要參考assembly - system.configuration)。 添加命名空間 - 使用System.Collections。專門用於使用NameValueCollection 。 代碼是這樣的
environments = ConfigurationManager.GetSection("Environment") as NameValueCollection;
string strConnString = environments[envs];
conn = new OleDbConnection(strConnString);
conn.Open();
OleDbDataAdapter objDa = new OleDbDataAdapter("select * from tblABC", conn);
DataSet ds1 = new DataSet();
objDa.Fill(ds1); dataGridView1.DataSource = ds1.Tables[0];
使用datset,我使用OleDbDataAdapter填充了datagrid。 它適用於我的Windows應用程序。
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