Question

我尝试连接到处于已挂载状态的数据库并使用此查询“从v $ instance选择状态”查询数据库状态，这是连接为sysdba所需的，连接字符串看起来像这个：

<add name="ORCL" connectionString="DBA Privilege=SYSDBA;user id=sys;password=oracle;data source=(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=SERVER1)(PORT=1521))(CONNECT_DATA=(UR = A)(SERVICE_NAME=ORCL)));"/>

如果您使用Oracle.DataAccess.Client，您可以执行此操作，但使用具有相同连接字符串的Oracle.ManagedDataAccess.Client会导致“ORA-01219：数据库未打开：仅在固定表/视图上允许查询”连接字符串相同的错误。

这是代码：

    public  class Repository
    {
       public static string GetServerVersion(DbConnection dbConn)
       {
        try
        {
            string result;
            using (dbConn)
            {
                if (dbConn.State == ConnectionState.Closed)
                    dbConn.Open();
                var dbStatus = GetStatus(dbConn);
                result = string.Format("Connected to Oracle Database {0}{1}Database Status {2}", dbConn.ServerVersion, Environment.NewLine, dbStatus);
            }
            return result;
        }
        catch (Exception ex)
        {
            return string.Format("Error : {0}", ex.Message);
        }
    }

    public static string GetStatus(DbConnection con)
    {
        var command = con.CreateCommand();
        command.CommandText = "Select status from v$instance";
        return command.ExecuteScalar().ToString();
    }
}

ManagedDataAccess使用Oracle.ManagedDataAccess.Client连接调用存储库

    using Oracle.ManagedDataAccess.Client;

    namespace Oracle.DataAccessTest
    {
      public class ManagedDataAccess
       {
          public static string GetServerVersion(string constr)
          {      
            return Repository.GetServerVersion(new OracleConnection(constr));
           }
       }
    }

UnManagedDataAccess使用Oracle.DataAccess.Client连接调用存储库

     using Oracle.DataAccess.Client;

     namespace Oracle.DataAccessTest
     {
        public class UnManagedDataAccess
        {
          public static string GetServerVersion(string constr)
          {
            return Repository.GetServerVersion(new OracleConnection(constr));
      }
    }
  }

最后：

    class Program
    {
      static void Main(string[] args)
      {
        var cnn = ConfigurationManager.ConnectionStrings["ORCL"].ConnectionString;
        Console.WriteLine("Oracle.DataAccess.Client");
        Console.WriteLine(UnManagedDataAccess.GetServerVersion(cnn));
        Console.WriteLine();
        Console.WriteLine("Oracle.ManagedDataAccess.Client");
        Console.WriteLine(ManagedDataAccess.GetServerVersion(cnn));
        Console.WriteLine();
        Console.ReadKey();
      }
    }

这就是输出：

   Oracle.DataAccess.Client
   Connected to Oracle Database 11.2.0.2.0
   Database Status MOUNTED

   Oracle.ManagedDataAccess.Client
   Error : ORA-06550: línea 1, columna 107:
   PL/SQL: ORA-01219: base de datos no abierta: sólo se permiten consultas    en tablas/vistas fijas

有关解决此问题的任何想法吗？

ORA-01219问题不会发生在Oracle.DataAccess.Client上，而是发生在Oracle.ManagedDataAccess.Client

0 个答案: