使用 ADO.NET 时创建 TCP 连接

演示如何使用 ADO.NET 连接对象打开连到 Cloud SQL for SQL Server 的 TCP 连接。

深入探索

如需查看包含此代码示例的详细文档，请参阅以下内容：

• 连接选项简介
• 从 App Engine 柔性环境连接
• 从 App Engine 标准环境连接
• 从 Cloud Build 连接
• 使用 Cloud SQL Auth 代理连接
• 管理数据库连接

代码示例

C#

如需向 Cloud SQL for SQL Server 进行身份验证，请设置应用默认凭据。如需了解详情，请参阅为本地开发环境设置身份验证。

using Microsoft.Data.SqlClient;
using System;

namespace CloudSql
{
    public class SqlServerTcp
    {
        public static SqlConnectionStringBuilder NewSqlServerTCPConnectionString()
        {
            // Equivalent connection string:
            // "User Id=<DB_USER>;Password=<DB_PASS>;Server=<INSTANCE_HOST>;Database=<DB_NAME>;"
            var connectionString = new SqlConnectionStringBuilder()
            {
                // Note: Saving credentials in environment variables is convenient, but not
                // secure - consider a more secure solution such as
                // Cloud Secret Manager (https://cloud.google.com/secret-manager) to help
                // keep secrets safe.
                DataSource = Environment.GetEnvironmentVariable("INSTANCE_HOST"), // e.g. '127.0.0.1'
                // Set Host to 'cloudsql' when deploying to App Engine Flexible environment
                UserID = Environment.GetEnvironmentVariable("DB_USER"),         // e.g. 'my-db-user'
                Password = Environment.GetEnvironmentVariable("DB_PASS"),       // e.g. 'my-db-password'
                InitialCatalog = Environment.GetEnvironmentVariable("DB_NAME"), // e.g. 'my-database'

                // The Cloud SQL proxy provides encryption between the proxy and instance
                Encrypt = false,
            };
            connectionString.Pooling = true;
            // Specify additional properties here.
            return connectionString;
        }
    }
}

后续步骤

如需搜索和过滤其他 Google Cloud 产品的代码示例，请参阅Google Cloud 示例浏览器。