PostgreSQL export to CSV
工作流概述
这是一个包含4个节点的中等工作流,主要用于自动化处理各种任务。
工作流源代码
{
"id": "39",
"meta": {
"instanceId": "a2434c94d549548a685cca39cc4614698e94f527bcea84eefa363f1037ae14cd"
},
"name": "PostgreSQL export to CSV",
"tags": [],
"nodes": [
{
"id": "ed94b34e-9ae6-4925-b292-b64a7e0bd602",
"name": "When clicking \"Execute Workflow\"",
"type": "n8n-nodes-base.manualTrigger",
"position": [
660,
420
],
"parameters": {},
"typeVersion": 1
},
{
"id": "f5ada70d-c186-4d28-a64b-3847e2625c8d",
"name": "Spreadsheet File",
"type": "n8n-nodes-base.spreadsheetFile",
"position": [
1260,
420
],
"parameters": {
"options": {},
"operation": "toFile",
"fileFormat": "csv"
},
"typeVersion": 1
},
{
"id": "4e06ae2b-ef42-4ef4-b7b2-56eb70738a03",
"name": "TableName",
"type": "n8n-nodes-base.set",
"position": [
840,
420
],
"parameters": {
"values": {
"string": [
{
"name": "TableName",
"value": "booksRead"
}
]
},
"options": {}
},
"typeVersion": 1
},
{
"id": "457ed549-507d-422a-bd14-1736252bd2e9",
"name": "Postgres",
"type": "n8n-nodes-base.postgres",
"position": [
1060,
420
],
"parameters": {
"query": "=SELECT * FROM {{ $json[\"TableName\"] }}",
"operation": "executeQuery",
"additionalFields": {}
},
"credentials": {
"postgres": {
"id": "33",
"name": "Postgres account"
}
},
"typeVersion": 1
}
],
"active": false,
"pinData": {
"Postgres": [
{
"json": {
"book_id": 1,
"read_date": "2022-09-08",
"book_title": "Demons",
"book_author": "Fyodor Dostoyevsky"
}
},
{
"json": {
"book_id": 2,
"read_date": "2022-05-06",
"book_title": "Ulysses",
"book_author": "James Joyce"
}
},
{
"json": {
"book_id": 3,
"read_date": "2023-01-04",
"book_title": "Catch-22",
"book_author": "Joseph Heller"
}
},
{
"json": {
"book_id": 4,
"read_date": "2023-01-21",
"book_title": "The Bell Jar",
"book_author": "Sylvia Plath"
}
},
{
"json": {
"book_id": 5,
"read_date": "2023-02-14",
"book_title": "Frankenstein",
"book_author": "Mary Shelley"
}
}
],
"Spreadsheet File": [
{
"json": {
"book_id": 1,
"read_date": "2022-09-08",
"book_title": "Demons",
"book_author": "Fyodor Dostoyevsky"
}
},
{
"json": {
"book_id": 2,
"read_date": "2022-05-06",
"book_title": "Ulysses",
"book_author": "James Joyce"
}
},
{
"json": {
"book_id": 3,
"read_date": "2023-01-04",
"book_title": "Catch-22",
"book_author": "Joseph Heller"
}
},
{
"json": {
"book_id": 4,
"read_date": "2023-01-21",
"book_title": "The Bell Jar",
"book_author": "Sylvia Plath"
}
},
{
"json": {
"book_id": 5,
"read_date": "2023-02-14",
"book_title": "Frankenstein",
"book_author": "Mary Shelley"
}
}
]
},
"settings": {},
"versionId": "586e2a98-69a0-4a40-8c92-89380a7cca73",
"connections": {
"Postgres": {
"main": [
[
{
"node": "Spreadsheet File",
"type": "main",
"index": 0
}
]
]
},
"TableName": {
"main": [
[
{
"node": "Postgres",
"type": "main",
"index": 0
}
]
]
},
"When clicking \"Execute Workflow\"": {
"main": [
[
{
"node": "TableName",
"type": "main",
"index": 0
}
]
]
}
}
}
功能特点
- 自动检测新邮件
- AI智能内容分析
- 自定义分类规则
- 批量处理能力
- 详细的处理日志
技术分析
节点类型及作用
- Manualtrigger
- Spreadsheetfile
- Set
- Postgres
复杂度评估
配置难度:
维护难度:
扩展性:
实施指南
前置条件
- 有效的Gmail账户
- n8n平台访问权限
- Google API凭证
- AI分类服务订阅
配置步骤
- 在n8n中导入工作流JSON文件
- 配置Gmail节点的认证信息
- 设置AI分类器的API密钥
- 自定义分类规则和标签映射
- 测试工作流执行
- 配置定时触发器(可选)
关键参数
| 参数名称 | 默认值 | 说明 |
|---|---|---|
| maxEmails | 50 | 单次处理的最大邮件数量 |
| confidenceThreshold | 0.8 | 分类置信度阈值 |
| autoLabel | true | 是否自动添加标签 |
最佳实践
优化建议
- 定期更新AI分类模型以提高准确性
- 根据邮件量调整处理批次大小
- 设置合理的分类置信度阈值
- 定期清理过期的分类规则
安全注意事项
- 妥善保管API密钥和认证信息
- 限制工作流的访问权限
- 定期审查处理日志
- 启用双因素认证保护Gmail账户
性能优化
- 使用增量处理减少重复工作
- 缓存频繁访问的数据
- 并行处理多个邮件分类任务
- 监控系统资源使用情况
故障排除
常见问题
邮件未被正确分类
检查AI分类器的置信度阈值设置,适当降低阈值或更新训练数据。
Gmail认证失败
确认Google API凭证有效且具有正确的权限范围,重新进行OAuth授权。
调试技巧
- 启用详细日志记录查看每个步骤的执行情况
- 使用测试邮件验证分类逻辑
- 检查网络连接和API服务状态
- 逐步执行工作流定位问题节点
错误处理
工作流包含以下错误处理机制:
- 网络超时自动重试(最多3次)
- API错误记录和告警
- 处理失败邮件的隔离机制
- 异常情况下的回滚操作