连接到 Redshift 集群时出错 - Npgsql.PostgresException: 28000: 主机没有 pg_hba.conf 条目

Question

我正在尝试从 C# 连接到 AWS Redshift 并执行一个简单的查询：

public void GetData()
{
    NpgsqlConnectionStringBuilder builder = new NpgsqlConnectionStringBuilder();
    builder.Host = "myhostname";
    builder.Port = 5439;
    builder.Database = "mydb";
    builder.Username = "myusername";
    builder.Password = "mypassword";
    builder.ServerCompatibilityMode = ServerCompatibilityMode.Redshift;

    using (var conn = new NpgsqlConnection(builder.ConnectionString))
    {
        conn.Open();
        if (conn.State == ConnectionState.Open)
        {
            using (var cmd = new NpgsqlCommand())
            {
                cmd.Connection = conn;
                cmd.CommandText = "SELECT TOP 10 field FROM example;";

                using (var reader = cmd.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        Console.WriteLine(reader.GetString(0));
                    }
                }
            }
        }
    }
}

尝试建立连接时，我得到：Npgsql.PostgresException: 28000: no pg_hba.conf entry for host。在同一台机器上，我可以使用相同的凭据使用 JetBrains DataGrip 连接到集群。

Answer 1

This 问题几乎是一样的，但不是手动创建连接字符串，而是使用构建器。所以这里是代码：

NpgsqlConnectionStringBuilder builder = new NpgsqlConnectionStringBuilder();
builder.TrustServerCertificate = true;
builder.SslMode = SslMode.Required;