快速入门：适用于 .NET 的 Azure Cosmos DB for Apache Gremlin 库

项目
12/21/2023

适用对象： Gremlin

Azure Cosmos DB for Apache Gremlin 是一种完全托管的图形数据库服务，用于实现常用的 Apache Tinkerpop（使用 Gremlin 查询语言的图形计算框架）。 API for Gremlin 为你提供了一种低摩擦方式来将 Gremlin 与服务结合使用，可通过最少的管理根据需要进行增长和横向扩展。

在本快速入门中，你会使用 Gremlin.Net 库连接到新建的 Azure Cosmos DB for Gremlin 帐户。

库源代码 | 包 (NuGet)

先决条件

具有活动订阅的 Azure 帐户。
- 无 Azure 订阅？注册 Azure 帐户。
.NET (LTS)
- 未安装 .NET？在 GitHub Codespaces 中试用本快速入门。
Azure 命令行接口 (CLI)

设置

本部分会引导你创建 API for Gremlin 帐户并设置 .NET 项目以使用该库连接到帐户。

创建 API for Gremlin 帐户

在使用 .NET 库之前，应先创建 API for Gremlin 帐户。此外，建立数据库和图表也很有帮助。

为 accountName、resourceGroupName 和 location 创建 shell 变量。

# Variable for resource group name
resourceGroupName="msdocs-cosmos-gremlin-quickstart"
location="westus"

# Variable for account name with a randomly generated suffix

let suffix=$RANDOM*$RANDOM
accountName="msdocs-gremlin-$suffix"

如果尚未登录到 Azure CLI，请使用 az login 登录。

使用 az group create 在订阅中创建新的资源组。

az group create \
    --name $resourceGroupName \
    --location $location

使用 az cosmosdb create 创建具有默认设置的新 API for Gremlin 帐户。

az cosmosdb create \
    --resource-group $resourceGroupName \
    --name $accountName \
    --capabilities "EnableGremlin" \
    --locations regionName=$location \
    --enable-free-tier true

使用 az cosmosdb show 获取帐户的 API for Gremlin 终结点 NAME。

az cosmosdb show \
    --resource-group $resourceGroupName \
    --name $accountName \
    --query "name"

使用 az-cosmosdb-keys-list 从帐户的密钥列表中查找 KEY。

az cosmosdb keys list \
    --resource-group $resourceGroupName \
    --name $accountName \
    --type "keys" \
    --query "primaryMasterKey"

记录 NAME 和 KEY 的值。稍后会使用这些凭据。

使用 az cosmosdb gremlin database create 创建名为“cosmicworks”的数据库。

az cosmosdb gremlin database create \
    --resource-group $resourceGroupName \
    --account-name $accountName \
    --name "cosmicworks"

使用 az cosmosdb gremlin graph create 创建图形。将图形命名为“products”，然后将吞吐量设置为“400”，最后将分区键路径设置为“/category”。

az cosmosdb gremlin graph create \
    --resource-group $resourceGroupName \
    --account-name $accountName \
    --database-name "cosmicworks" \
    --name "products" \
    --partition-key-path "/category" \
    --throughput 400

创建新的 .NET 控制台应用程序

使用首选终端在空文件夹中新建 .NET 控制台应用程序。

在空文件夹中打开终端。
使用 dotnet new 命令指定 "console" 模板。
```
dotnet new console
```

安装 NuGet 包

将 Gremlin.NET NuGet 包添加到 .NET 项目。

使用 dotnet add package 命令指定 Gremlin.Net NuGet 包。
```
dotnet add package Gremlin.Net
```

使用 dotnet build生成 .NET 项目。

dotnet build

确保生成成功且没有错误。内部版本的预期输出应如下所示：

Determining projects to restore...
  All projects are up-to-date for restore.
  dslkajfjlksd -> \dslkajfjlksd\bin\Debug\net6.0\dslkajfjlksd.dll

Build succeeded.
    0 Warning(s)
    0 Error(s)

配置环境变量

要使用本快速入门中前面获得的 NAME 和 URI 值，请将其保存到运行应用程序的本地计算机上的新环境变量。

要设置环境变量，请使用终端将值分别保留为“COSMOS_ENDPOINT”和“COSMOS_KEY”。
```
export COSMOS_GREMLIN_ENDPOINT="<account-name>"
export COSMOS_GREMLIN_KEY="<account-key>"
```

验证是否已正确设置环境变量。

printenv COSMOS_GREMLIN_ENDPOINT
printenv COSMOS_GREMLIN_KEY

本文中的代码连接到名为“cosmicworks”的数据库和名为“products”的图形。然后，代码在遍历添加的项之前，将顶点和边缘添加到图形。

验证客户端

对大多数 Azure 服务的应用程序请求必须获得授权。对于 API for Gremlin，请使用本快速入门前面获取的名称和 URI 值。

打开 Program.cs 文件。
删除文件中的任何现有内容。
为 Gremlin.Net.Driver 命名空间添加一个 using 块。

// <imports>
using Gremlin.Net.Driver;
// </imports>

// <environment_variables>
string accountName = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_ENDPOINT")!;
string accountKey = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_KEY")!;
// </environment_variables>

// <authenticate_client>
var server = new GremlinServer(
    hostname: $"{accountName}.gremlin.cosmos.azure.cn",
    port: 443,
    username: "/dbs/cosmicworks/colls/products",
    password: $"{accountKey}",
    enableSsl: true
);
// </authenticate_client>

// <connect_client>
using var client = new GremlinClient(
    gremlinServer: server,
    messageSerializer: new Gremlin.Net.Structure.IO.GraphSON.GraphSON2MessageSerializer()
);
// </connect_client>

// <drop_graph>
await client.SubmitAsync(
    requestScript: "g.V().drop()"
);
// </drop_graph>

// <create_vertices_1>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518371').property('name', 'Kiama classic surfboard').property('price', 285.55).property('category', 'surfboards')"
);
// </create_vertices_1>

// <create_vertices_2>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518403').property('name', 'Montau Turtle Surfboard').property('price', 600.00).property('category', 'surfboards')"
);
// </create_vertices_2>

// <create_vertices_3>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518409').property('name', 'Bondi Twin Surfboard').property('price', 585.50).property('category', 'surfboards')"
);
// </create_vertices_3>

// <create_edges_1>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518371']))"
);
// </create_edges_1>

// <create_edges_2>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518409']))"
);
// </create_edges_2>

// <query_vertices_edges>
var results = await client.SubmitAsync<Dictionary<string, object>>(
    requestScript: "g.V().hasLabel('product').has('category', 'surfboards').has('name', 'Montau Turtle Surfboard').outE('replaces').inV()"
);
// </query_vertices_edges>

// <output_vertices_edges>
Console.WriteLine($"[CREATED PRODUCT]\t68719518403");
foreach (var result in results ?? Enumerable.Empty<Dictionary<string, object>>())
{
    Console.WriteLine($"[REPLACES PRODUCT]\t{result["id"]}");
}
// </output_vertices_edges>

创建 accountName 和 accountKey 字符串变量。将 COSMOS_GREMLIN_ENDPOINT 和 COSMOS_GREMLIN_KEY 环境变量存储为每个相应变量的值。

// <imports>
using Gremlin.Net.Driver;
// </imports>

// <environment_variables>
string accountName = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_ENDPOINT")!;
string accountKey = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_KEY")!;
// </environment_variables>

// <authenticate_client>
var server = new GremlinServer(
    hostname: $"{accountName}.gremlin.cosmos.azure.cn",
    port: 443,
    username: "/dbs/cosmicworks/colls/products",
    password: $"{accountKey}",
    enableSsl: true
);
// </authenticate_client>

// <connect_client>
using var client = new GremlinClient(
    gremlinServer: server,
    messageSerializer: new Gremlin.Net.Structure.IO.GraphSON.GraphSON2MessageSerializer()
);
// </connect_client>

// <drop_graph>
await client.SubmitAsync(
    requestScript: "g.V().drop()"
);
// </drop_graph>

// <create_vertices_1>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518371').property('name', 'Kiama classic surfboard').property('price', 285.55).property('category', 'surfboards')"
);
// </create_vertices_1>

// <create_vertices_2>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518403').property('name', 'Montau Turtle Surfboard').property('price', 600.00).property('category', 'surfboards')"
);
// </create_vertices_2>

// <create_vertices_3>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518409').property('name', 'Bondi Twin Surfboard').property('price', 585.50).property('category', 'surfboards')"
);
// </create_vertices_3>

// <create_edges_1>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518371']))"
);
// </create_edges_1>

// <create_edges_2>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518409']))"
);
// </create_edges_2>

// <query_vertices_edges>
var results = await client.SubmitAsync<Dictionary<string, object>>(
    requestScript: "g.V().hasLabel('product').has('category', 'surfboards').has('name', 'Montau Turtle Surfboard').outE('replaces').inV()"
);
// </query_vertices_edges>

// <output_vertices_edges>
Console.WriteLine($"[CREATED PRODUCT]\t68719518403");
foreach (var result in results ?? Enumerable.Empty<Dictionary<string, object>>())
{
    Console.WriteLine($"[REPLACES PRODUCT]\t{result["id"]}");
}
// </output_vertices_edges>

使用帐户的凭据创建 GremlinServer 的新实例。

// <imports>
using Gremlin.Net.Driver;
// </imports>

// <environment_variables>
string accountName = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_ENDPOINT")!;
string accountKey = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_KEY")!;
// </environment_variables>

// <authenticate_client>
var server = new GremlinServer(
    hostname: $"{accountName}.gremlin.cosmos.azure.cn",
    port: 443,
    username: "/dbs/cosmicworks/colls/products",
    password: $"{accountKey}",
    enableSsl: true
);
// </authenticate_client>

// <connect_client>
using var client = new GremlinClient(
    gremlinServer: server,
    messageSerializer: new Gremlin.Net.Structure.IO.GraphSON.GraphSON2MessageSerializer()
);
// </connect_client>

// <drop_graph>
await client.SubmitAsync(
    requestScript: "g.V().drop()"
);
// </drop_graph>

// <create_vertices_1>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518371').property('name', 'Kiama classic surfboard').property('price', 285.55).property('category', 'surfboards')"
);
// </create_vertices_1>

// <create_vertices_2>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518403').property('name', 'Montau Turtle Surfboard').property('price', 600.00).property('category', 'surfboards')"
);
// </create_vertices_2>

// <create_vertices_3>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518409').property('name', 'Bondi Twin Surfboard').property('price', 585.50).property('category', 'surfboards')"
);
// </create_vertices_3>

// <create_edges_1>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518371']))"
);
// </create_edges_1>

// <create_edges_2>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518409']))"
);
// </create_edges_2>

// <query_vertices_edges>
var results = await client.SubmitAsync<Dictionary<string, object>>(
    requestScript: "g.V().hasLabel('product').has('category', 'surfboards').has('name', 'Montau Turtle Surfboard').outE('replaces').inV()"
);
// </query_vertices_edges>

// <output_vertices_edges>
Console.WriteLine($"[CREATED PRODUCT]\t68719518403");
foreach (var result in results ?? Enumerable.Empty<Dictionary<string, object>>())
{
    Console.WriteLine($"[REPLACES PRODUCT]\t{result["id"]}");
}
// </output_vertices_edges>

使用远程服务器凭据和 GraphSON 2.0 序列化程序创建 GremlinClient 的新实例。

// <imports>
using Gremlin.Net.Driver;
// </imports>

// <environment_variables>
string accountName = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_ENDPOINT")!;
string accountKey = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_KEY")!;
// </environment_variables>

// <authenticate_client>
var server = new GremlinServer(
    hostname: $"{accountName}.gremlin.cosmos.azure.cn",
    port: 443,
    username: "/dbs/cosmicworks/colls/products",
    password: $"{accountKey}",
    enableSsl: true
);
// </authenticate_client>

// <connect_client>
using var client = new GremlinClient(
    gremlinServer: server,
    messageSerializer: new Gremlin.Net.Structure.IO.GraphSON.GraphSON2MessageSerializer()
);
// </connect_client>

// <drop_graph>
await client.SubmitAsync(
    requestScript: "g.V().drop()"
);
// </drop_graph>

// <create_vertices_1>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518371').property('name', 'Kiama classic surfboard').property('price', 285.55).property('category', 'surfboards')"
);
// </create_vertices_1>

// <create_vertices_2>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518403').property('name', 'Montau Turtle Surfboard').property('price', 600.00).property('category', 'surfboards')"
);
// </create_vertices_2>

// <create_vertices_3>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518409').property('name', 'Bondi Twin Surfboard').property('price', 585.50).property('category', 'surfboards')"
);
// </create_vertices_3>

// <create_edges_1>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518371']))"
);
// </create_edges_1>

// <create_edges_2>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518409']))"
);
// </create_edges_2>

// <query_vertices_edges>
var results = await client.SubmitAsync<Dictionary<string, object>>(
    requestScript: "g.V().hasLabel('product').has('category', 'surfboards').has('name', 'Montau Turtle Surfboard').outE('replaces').inV()"
);
// </query_vertices_edges>

// <output_vertices_edges>
Console.WriteLine($"[CREATED PRODUCT]\t68719518403");
foreach (var result in results ?? Enumerable.Empty<Dictionary<string, object>>())
{
    Console.WriteLine($"[REPLACES PRODUCT]\t{result["id"]}");
}
// </output_vertices_edges>

创建顶点

现在，应用程序已连接到帐户，请使用标准 Gremlin 语法创建顶点。

使用“SubmitAsync”在 API for Gremlin 帐户的服务器端运行命令。使用以下属性创建产品顶点：

值

label product

id 68719518371

name Kiama classic surfboard

price 285.55

category surfboards

	值
label	`product`
id	`68719518371`
`name`	`Kiama classic surfboard`
`price`	`285.55`
`category`	`surfboards`

// <imports>
using Gremlin.Net.Driver;
// </imports>

// <environment_variables>
string accountName = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_ENDPOINT")!;
string accountKey = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_KEY")!;
// </environment_variables>

// <authenticate_client>
var server = new GremlinServer(
    hostname: $"{accountName}.gremlin.cosmos.azure.cn",
    port: 443,
    username: "/dbs/cosmicworks/colls/products",
    password: $"{accountKey}",
    enableSsl: true
);
// </authenticate_client>

// <connect_client>
using var client = new GremlinClient(
    gremlinServer: server,
    messageSerializer: new Gremlin.Net.Structure.IO.GraphSON.GraphSON2MessageSerializer()
);
// </connect_client>

// <drop_graph>
await client.SubmitAsync(
    requestScript: "g.V().drop()"
);
// </drop_graph>

// <create_vertices_1>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518371').property('name', 'Kiama classic surfboard').property('price', 285.55).property('category', 'surfboards')"
);
// </create_vertices_1>

// <create_vertices_2>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518403').property('name', 'Montau Turtle Surfboard').property('price', 600.00).property('category', 'surfboards')"
);
// </create_vertices_2>

// <create_vertices_3>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518409').property('name', 'Bondi Twin Surfboard').property('price', 585.50).property('category', 'surfboards')"
);
// </create_vertices_3>

// <create_edges_1>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518371']))"
);
// </create_edges_1>

// <create_edges_2>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518409']))"
);
// </create_edges_2>

// <query_vertices_edges>
var results = await client.SubmitAsync<Dictionary<string, object>>(
    requestScript: "g.V().hasLabel('product').has('category', 'surfboards').has('name', 'Montau Turtle Surfboard').outE('replaces').inV()"
);
// </query_vertices_edges>

// <output_vertices_edges>
Console.WriteLine($"[CREATED PRODUCT]\t68719518403");
foreach (var result in results ?? Enumerable.Empty<Dictionary<string, object>>())
{
    Console.WriteLine($"[REPLACES PRODUCT]\t{result["id"]}");
}
// </output_vertices_edges>

使用以下属性创建第二个产品顶点：

值

label product

id 68719518403

name Montau Turtle Surfboard

price 600.00

category surfboards

	值
label	`product`
id	`68719518403`
`name`	`Montau Turtle Surfboard`
`price`	`600.00`
`category`	`surfboards`

// <imports>
using Gremlin.Net.Driver;
// </imports>

// <environment_variables>
string accountName = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_ENDPOINT")!;
string accountKey = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_KEY")!;
// </environment_variables>

// <authenticate_client>
var server = new GremlinServer(
    hostname: $"{accountName}.gremlin.cosmos.azure.cn",
    port: 443,
    username: "/dbs/cosmicworks/colls/products",
    password: $"{accountKey}",
    enableSsl: true
);
// </authenticate_client>

// <connect_client>
using var client = new GremlinClient(
    gremlinServer: server,
    messageSerializer: new Gremlin.Net.Structure.IO.GraphSON.GraphSON2MessageSerializer()
);
// </connect_client>

// <drop_graph>
await client.SubmitAsync(
    requestScript: "g.V().drop()"
);
// </drop_graph>

// <create_vertices_1>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518371').property('name', 'Kiama classic surfboard').property('price', 285.55).property('category', 'surfboards')"
);
// </create_vertices_1>

// <create_vertices_2>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518403').property('name', 'Montau Turtle Surfboard').property('price', 600.00).property('category', 'surfboards')"
);
// </create_vertices_2>

// <create_vertices_3>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518409').property('name', 'Bondi Twin Surfboard').property('price', 585.50).property('category', 'surfboards')"
);
// </create_vertices_3>

// <create_edges_1>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518371']))"
);
// </create_edges_1>

// <create_edges_2>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518409']))"
);
// </create_edges_2>

// <query_vertices_edges>
var results = await client.SubmitAsync<Dictionary<string, object>>(
    requestScript: "g.V().hasLabel('product').has('category', 'surfboards').has('name', 'Montau Turtle Surfboard').outE('replaces').inV()"
);
// </query_vertices_edges>

// <output_vertices_edges>
Console.WriteLine($"[CREATED PRODUCT]\t68719518403");
foreach (var result in results ?? Enumerable.Empty<Dictionary<string, object>>())
{
    Console.WriteLine($"[REPLACES PRODUCT]\t{result["id"]}");
}
// </output_vertices_edges>

使用以下属性创建第三个产品顶点：

值

label product

id 68719518409

name Bondi Twin Surfboard

price 585.50

category surfboards

	值
label	`product`
id	`68719518409`
`name`	`Bondi Twin Surfboard`
`price`	`585.50`
`category`	`surfboards`

// <imports>
using Gremlin.Net.Driver;
// </imports>

// <environment_variables>
string accountName = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_ENDPOINT")!;
string accountKey = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_KEY")!;
// </environment_variables>

// <authenticate_client>
var server = new GremlinServer(
    hostname: $"{accountName}.gremlin.cosmos.azure.cn",
    port: 443,
    username: "/dbs/cosmicworks/colls/products",
    password: $"{accountKey}",
    enableSsl: true
);
// </authenticate_client>

// <connect_client>
using var client = new GremlinClient(
    gremlinServer: server,
    messageSerializer: new Gremlin.Net.Structure.IO.GraphSON.GraphSON2MessageSerializer()
);
// </connect_client>

// <drop_graph>
await client.SubmitAsync(
    requestScript: "g.V().drop()"
);
// </drop_graph>

// <create_vertices_1>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518371').property('name', 'Kiama classic surfboard').property('price', 285.55).property('category', 'surfboards')"
);
// </create_vertices_1>

// <create_vertices_2>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518403').property('name', 'Montau Turtle Surfboard').property('price', 600.00).property('category', 'surfboards')"
);
// </create_vertices_2>

// <create_vertices_3>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518409').property('name', 'Bondi Twin Surfboard').property('price', 585.50).property('category', 'surfboards')"
);
// </create_vertices_3>

// <create_edges_1>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518371']))"
);
// </create_edges_1>

// <create_edges_2>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518409']))"
);
// </create_edges_2>

// <query_vertices_edges>
var results = await client.SubmitAsync<Dictionary<string, object>>(
    requestScript: "g.V().hasLabel('product').has('category', 'surfboards').has('name', 'Montau Turtle Surfboard').outE('replaces').inV()"
);
// </query_vertices_edges>

// <output_vertices_edges>
Console.WriteLine($"[CREATED PRODUCT]\t68719518403");
foreach (var result in results ?? Enumerable.Empty<Dictionary<string, object>>())
{
    Console.WriteLine($"[REPLACES PRODUCT]\t{result["id"]}");
}
// </output_vertices_edges>

创建边缘

使用 Gremlin 语法创建边缘，以定义顶点之间的关系。

创建从名为“替换”的 Montau Turtle Surfboard 产品到 Kiama classic surfboard 产品的边缘。

// <imports>
using Gremlin.Net.Driver;
// </imports>

// <environment_variables>
string accountName = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_ENDPOINT")!;
string accountKey = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_KEY")!;
// </environment_variables>

// <authenticate_client>
var server = new GremlinServer(
    hostname: $"{accountName}.gremlin.cosmos.azure.cn",
    port: 443,
    username: "/dbs/cosmicworks/colls/products",
    password: $"{accountKey}",
    enableSsl: true
);
// </authenticate_client>

// <connect_client>
using var client = new GremlinClient(
    gremlinServer: server,
    messageSerializer: new Gremlin.Net.Structure.IO.GraphSON.GraphSON2MessageSerializer()
);
// </connect_client>

// <drop_graph>
await client.SubmitAsync(
    requestScript: "g.V().drop()"
);
// </drop_graph>

// <create_vertices_1>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518371').property('name', 'Kiama classic surfboard').property('price', 285.55).property('category', 'surfboards')"
);
// </create_vertices_1>

// <create_vertices_2>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518403').property('name', 'Montau Turtle Surfboard').property('price', 600.00).property('category', 'surfboards')"
);
// </create_vertices_2>

// <create_vertices_3>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518409').property('name', 'Bondi Twin Surfboard').property('price', 585.50).property('category', 'surfboards')"
);
// </create_vertices_3>

// <create_edges_1>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518371']))"
);
// </create_edges_1>

// <create_edges_2>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518409']))"
);
// </create_edges_2>

// <query_vertices_edges>
var results = await client.SubmitAsync<Dictionary<string, object>>(
    requestScript: "g.V().hasLabel('product').has('category', 'surfboards').has('name', 'Montau Turtle Surfboard').outE('replaces').inV()"
);
// </query_vertices_edges>

// <output_vertices_edges>
Console.WriteLine($"[CREATED PRODUCT]\t68719518403");
foreach (var result in results ?? Enumerable.Empty<Dictionary<string, object>>())
{
    Console.WriteLine($"[REPLACES PRODUCT]\t{result["id"]}");
}
// </output_vertices_edges>

提示

此边缘定义使用 g.V(['<partition-key>', '<id>']) 语法。或者，也可使用 g.V('<id>').has('category', '<partition-key>')。

创建从同一产品到 Bondi Twin Surfboard 的另一个替换边缘。

// <imports>
using Gremlin.Net.Driver;
// </imports>

// <environment_variables>
string accountName = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_ENDPOINT")!;
string accountKey = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_KEY")!;
// </environment_variables>

// <authenticate_client>
var server = new GremlinServer(
    hostname: $"{accountName}.gremlin.cosmos.azure.cn",
    port: 443,
    username: "/dbs/cosmicworks/colls/products",
    password: $"{accountKey}",
    enableSsl: true
);
// </authenticate_client>

// <connect_client>
using var client = new GremlinClient(
    gremlinServer: server,
    messageSerializer: new Gremlin.Net.Structure.IO.GraphSON.GraphSON2MessageSerializer()
);
// </connect_client>

// <drop_graph>
await client.SubmitAsync(
    requestScript: "g.V().drop()"
);
// </drop_graph>

// <create_vertices_1>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518371').property('name', 'Kiama classic surfboard').property('price', 285.55).property('category', 'surfboards')"
);
// </create_vertices_1>

// <create_vertices_2>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518403').property('name', 'Montau Turtle Surfboard').property('price', 600.00).property('category', 'surfboards')"
);
// </create_vertices_2>

// <create_vertices_3>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518409').property('name', 'Bondi Twin Surfboard').property('price', 585.50).property('category', 'surfboards')"
);
// </create_vertices_3>

// <create_edges_1>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518371']))"
);
// </create_edges_1>

// <create_edges_2>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518409']))"
);
// </create_edges_2>

// <query_vertices_edges>
var results = await client.SubmitAsync<Dictionary<string, object>>(
    requestScript: "g.V().hasLabel('product').has('category', 'surfboards').has('name', 'Montau Turtle Surfboard').outE('replaces').inV()"
);
// </query_vertices_edges>

// <output_vertices_edges>
Console.WriteLine($"[CREATED PRODUCT]\t68719518403");
foreach (var result in results ?? Enumerable.Empty<Dictionary<string, object>>())
{
    Console.WriteLine($"[REPLACES PRODUCT]\t{result["id"]}");
}
// </output_vertices_edges>

查询顶点和边缘

使用 Gremlin 语法遍历图形并发现顶点之间的关系。

遍历图形并查找 Montau Turtle Surfboard 替换的所有顶点。

// <imports>
using Gremlin.Net.Driver;
// </imports>

// <environment_variables>
string accountName = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_ENDPOINT")!;
string accountKey = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_KEY")!;
// </environment_variables>

// <authenticate_client>
var server = new GremlinServer(
    hostname: $"{accountName}.gremlin.cosmos.azure.cn",
    port: 443,
    username: "/dbs/cosmicworks/colls/products",
    password: $"{accountKey}",
    enableSsl: true
);
// </authenticate_client>

// <connect_client>
using var client = new GremlinClient(
    gremlinServer: server,
    messageSerializer: new Gremlin.Net.Structure.IO.GraphSON.GraphSON2MessageSerializer()
);
// </connect_client>

// <drop_graph>
await client.SubmitAsync(
    requestScript: "g.V().drop()"
);
// </drop_graph>

// <create_vertices_1>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518371').property('name', 'Kiama classic surfboard').property('price', 285.55).property('category', 'surfboards')"
);
// </create_vertices_1>

// <create_vertices_2>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518403').property('name', 'Montau Turtle Surfboard').property('price', 600.00).property('category', 'surfboards')"
);
// </create_vertices_2>

// <create_vertices_3>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518409').property('name', 'Bondi Twin Surfboard').property('price', 585.50).property('category', 'surfboards')"
);
// </create_vertices_3>

// <create_edges_1>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518371']))"
);
// </create_edges_1>

// <create_edges_2>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518409']))"
);
// </create_edges_2>

// <query_vertices_edges>
var results = await client.SubmitAsync<Dictionary<string, object>>(
    requestScript: "g.V().hasLabel('product').has('category', 'surfboards').has('name', 'Montau Turtle Surfboard').outE('replaces').inV()"
);
// </query_vertices_edges>

// <output_vertices_edges>
Console.WriteLine($"[CREATED PRODUCT]\t68719518403");
foreach (var result in results ?? Enumerable.Empty<Dictionary<string, object>>())
{
    Console.WriteLine($"[REPLACES PRODUCT]\t{result["id"]}");
}
// </output_vertices_edges>

将静态字符串 [CREATED PRODUCT]\t68719518403写入控制台。然后，使用 foreach 循环循环访问每个匹配顶点，并将以 [REPLACES PRODUCT] 开头的消息写入控制台，并将匹配的产品 id 字段作为后缀。

// <imports>
using Gremlin.Net.Driver;
// </imports>

// <environment_variables>
string accountName = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_ENDPOINT")!;
string accountKey = Environment.GetEnvironmentVariable("COSMOS_GREMLIN_KEY")!;
// </environment_variables>

// <authenticate_client>
var server = new GremlinServer(
    hostname: $"{accountName}.gremlin.cosmos.azure.cn",
    port: 443,
    username: "/dbs/cosmicworks/colls/products",
    password: $"{accountKey}",
    enableSsl: true
);
// </authenticate_client>

// <connect_client>
using var client = new GremlinClient(
    gremlinServer: server,
    messageSerializer: new Gremlin.Net.Structure.IO.GraphSON.GraphSON2MessageSerializer()
);
// </connect_client>

// <drop_graph>
await client.SubmitAsync(
    requestScript: "g.V().drop()"
);
// </drop_graph>

// <create_vertices_1>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518371').property('name', 'Kiama classic surfboard').property('price', 285.55).property('category', 'surfboards')"
);
// </create_vertices_1>

// <create_vertices_2>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518403').property('name', 'Montau Turtle Surfboard').property('price', 600.00).property('category', 'surfboards')"
);
// </create_vertices_2>

// <create_vertices_3>
await client.SubmitAsync(
    requestScript: "g.addV('product').property('id', '68719518409').property('name', 'Bondi Twin Surfboard').property('price', 585.50).property('category', 'surfboards')"
);
// </create_vertices_3>

// <create_edges_1>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518371']))"
);
// </create_edges_1>

// <create_edges_2>
await client.SubmitAsync(
    requestScript: "g.V(['surfboards', '68719518403']).addE('replaces').to(g.V(['surfboards', '68719518409']))"
);
// </create_edges_2>

// <query_vertices_edges>
var results = await client.SubmitAsync<Dictionary<string, object>>(
    requestScript: "g.V().hasLabel('product').has('category', 'surfboards').has('name', 'Montau Turtle Surfboard').outE('replaces').inV()"
);
// </query_vertices_edges>

// <output_vertices_edges>
Console.WriteLine($"[CREATED PRODUCT]\t68719518403");
foreach (var result in results ?? Enumerable.Empty<Dictionary<string, object>>())
{
    Console.WriteLine($"[REPLACES PRODUCT]\t{result["id"]}");
}
// </output_vertices_edges>

运行代码

运行应用程序以验证应用程序是否按预期工作。应用程序执行时应没有错误或警告。应用程序的输出包括有关创建项和查询项的数据。

在 .NET 项目文件夹中打开终端。
使用 dotnet run 运行应用程序。
```
dotnet run
```

观察应用程序的输出。

[CREATED PRODUCT]       68719518403
[REPLACES PRODUCT]      68719518371
[REPLACES PRODUCT]      68719518409

清理资源

当不再需要 API for Gremlin 帐户时，删除相应的资源组。

为 resourceGroupName 创建 shell 变量（如果尚不存在）。

# Variable for resource group name
resourceGroupName="msdocs-cosmos-gremlin-quickstart"

使用 az group delete 删除资源组。

az group delete \
    --name $resourceGroupName

下一步

使用 Azure Cosmos DB for Apache Gremlin 创建和查询数据