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

下载
{
  "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

  1. 在n8n中导入工作流JSON文件
  2. 配置Gmail节点的认证信息
  3. 设置AI分类器的API密钥
  4. 自定义分类规则和标签映射
  5. 测试工作流执行
  6. 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