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# Neptune 加载程序示例
<a name="load-api-reference-load-examples"></a>

 此示例演示如何使用 Neptune 加载程序使用 Gremlin CSV 格式将数据加载到 Neptune 图形数据库中。该请求作为 HTTP POST 请求发送到 Neptune 加载程序端点，请求正文包含指定数据来源、格式、IAM 角色和其他配置选项所需的参数。响应包括加载 ID，可用于跟踪数据加载过程的进度。

**Example 请求**  
下面是使用 `curl` 命令经由 HTTP POST 发送的请求。它加载 Neptune CSV 格式的文件。有关更多信息，请参阅 [Gremlin 加载数据格式](bulk-load-tutorial-format-gremlin.md)。  

```
aws neptunedata start-loader-job \
  --endpoint-url https://{{your-neptune-endpoint}}:{{port}} \
  --source "s3://{{bucket-name}}/{{object-key-name}}" \
  --format "csv" \
  --iam-role-arn "{{ARN for the IAM role you are using}}" \
  --s3-bucket-region "{{region}}" \
  --no-fail-on-error \
  --parallelism "MEDIUM" \
  --no-update-single-cardinality-properties \
  --no-queue-request
```
有关更多信息，请参阅《 Amazon CLI 命令参考》[start-loader-job](https://docs.amazonaws.cn/cli/latest/reference/neptunedata/start-loader-job.html)中的。

```
import boto3
from botocore.config import Config

client = boto3.client(
    'neptunedata',
    endpoint_url='https://{{your-neptune-endpoint}}:{{port}}',
    config=Config(read_timeout=None, retries={'total_max_attempts': 1})
)

response = client.start_loader_job(
    source='s3://{{bucket-name}}/{{object-key-name}}',
    format='csv',
    iamRoleArn='{{ARN for the IAM role you are using}}',
    s3BucketRegion='{{region}}',
    failOnError=False,
    parallelism='MEDIUM',
    updateSingleCardinalityProperties=False,
    queueRequest=False
)

print(response)
```

```
awscurl https://{{your-neptune-endpoint}}:{{port}}/loader \
  --region {{us-east-1}} \
  --service neptune-db \
  -X POST \
  -H 'Content-Type: application/json' \
  -d '{
        "source" : "s3://{{bucket-name}}/{{object-key-name}}",
        "format" : "csv",
        "iamRoleArn" : "{{ARN for the IAM role you are using}}",
        "region" : "{{region}}",
        "failOnError" : "FALSE",
        "parallelism" : "MEDIUM",
        "updateSingleCardinalityProperties" : "FALSE",
        "queueRequest" : "FALSE"
      }'
```
此示例假设您的 Amazon 证书是在您的环境中配置的。{{us-east-1}}替换为 Neptune 集群的区域。

```
curl -X POST https://{{your-neptune-endpoint}}:{{port}}/loader \
  -H 'Content-Type: application/json' \
  -d '{
        "source" : "s3://{{bucket-name}}/{{object-key-name}}",
        "format" : "csv",
        "iamRoleArn" : "{{ARN for the IAM role you are using}}",
        "region" : "{{region}}",
        "failOnError" : "FALSE",
        "parallelism" : "MEDIUM",
        "updateSingleCardinalityProperties" : "FALSE",
        "queueRequest" : "FALSE"
      }'
```

**Example 响应**  

```
{
    "status" : "200 OK",
    "payload" : {
        "loadId" : "{{ef478d76-d9da-4d94-8ff1-08d9d4863aa5}}"
    }
}
```