如何创建从C＃到远程Couchbase数据库的数据库连接

Question

I am kind of new to couchbase database and trying to write a code to connect to a remote couchbase server for my first time. I have written a console application in C# where i have a app.config file and the program.cs file.

My app.config file is as follows

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
  <configSections>
    <sectionGroup name="couchbaseClients">
      <section name="couchbase"
               type="Couchbase.Configuration.Client.Providers.CouchbaseClientSection, Couchbase.NetClient"/>
    </sectionGroup>
  </configSections>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
  <couchbaseClients>
    <couchbase useSsl="false" operationLifeSpan="1000">
      <servers>
        <add uri="http://xxx.xxx.xxx.xxx:8091/pools"></add>
        <add uri="http://xxx.xxx.xxx.xxx:8091/pools"></add>
      </servers>
      <buckets>
        <add name="default" useSsl="false" Username="xxxxxx" password="xxxxx" operationLifespan="2000">
          <connectionPool name="custom" maxSize="10" minSize="5" sendTimeout="12000"></connectionPool>
        </add>
      </buckets>
    </couchbase>
  </couchbaseClients>
</configuration>

and my Program.cs file is as follows

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Couchbase;
using Enyim.Caching.Memcached;
using Newtonsoft.Json;
using System.Configuration;

namespace CouchBase_ConnectionTester
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var cluster = new Cluster("couchbaseClients/couchbase"))
            {
                using (var bucket = cluster.OpenBucket())
                {

                }
            }
        }
    }
}

when I try to debug the code, it throws an error at code line

using (var cluster = new Cluster("couchbaseClients/couchbase"))

error message is as follows

The type initializer for 'Couchbase.Cluster' threw an exception.

Inner exception is as follows

Failed obtaining configuration for Common.Logging from configuration section 'common/logging

Please help me on this. Thanks in advnce

Answer 1

Unfortunately, I wasn't able to reproduce the error that you're seeing in this specific setup. However, I do have an answer to your question: "How to create a database connection from C# to a remote couchbase database".

The CData ADO.NET Provider is a driver that allows you access your Couchbase data as if it were a relational database. This is done by wrapping the N1QL REST API into a standards-based driver that incorporates familiar .NET database functionality.

Querying from a bucket is as simple as the following code:

string connectionString = "User='myusername';Password='mypassword';Server='http://couchbase40'";
using (CouchbaseConnection connection = new CouchbaseConnection(connectionString)) {
  CouchbaseCommand cmd = new CouchbaseCommand("SELECT * FROM Customer", connection);
  CouchbaseDataReader rdr = cmd.ExecuteReader();

  while (rdr.Read()) {
    Console.WriteLine(String.Format("\t{0} --> \t\t{1}", rdr["Name"],     rdr["TotalDue"]));
  }
}

You can download a free beta build of the 2016 driver here .

Answer 2

With the Couchbase .Net driver, pls make sure you have followed the instructions here to get it set up fine.

Could you try the following and see if you get a different error?

        var config = new ClientConfiguration
        {
            Servers = new List<Uri> { 
                new Uri("http://10.0.0.XX:8091/pools")
            },
            UseSsl = false,
            DefaultOperationLifespan = 1000,
            BucketConfigs = new Dictionary<string, BucketConfiguration>
            {
              {"default", new BucketConfiguration
              {
                  BucketName = "default",
                  UseSsl = false,
                  Password = "",
                  DefaultOperationLifespan = 2000,
                  PoolConfiguration = new PoolConfiguration
                  {
                    MaxSize = 10,
                    MinSize = 5,
                    SendTimeout = 12000
                  }
              }
             }
            }
        };

      Cluster cbCluster = new Cluster(config);
      Document<object> cbDoc = new Document<dynamic> { 
                        Id = _key,
                        Content = new
                        {
                            id = "a"
                        }
                    };

      //UPSERT
      var upsert = cbBucket.Upsert(cbDoc);
      ....