PostgreSQL访问SqlServer工具—tds_fdw

一、tds_fdw概述

1.1、tds_fdw 功能介绍

tds_fdw 是 PostgreSQL 中的一个外部数据包装器（Foreign Data Wrapper），它允许 PostgreSQL 连接到使用 Tabular Data Stream（TDS）协议的数据库，如 Sybase 和 Microsoft SQL Server。tds_fdw 的核心功能是通过 FreeTDS 库实现与 TDS 协议兼容数据库的通信，支持 PostgreSQL 9.2 及更高版本，并且已经在多种操作系统上进行了测试，包括但不限于 CentOS、Ubuntu、openSUSE 等。

1.2、tds_fdw 用途

主要是在 PostgreSQL 中集成和操作远程的 SQL Server 数据，而无需进行复杂的数据迁移或重建整个数据结构。它适用于需要在 PostgreSQL 环境中集成 SQL Server 或 Sybase 数据的场景，或者在进行数据迁移或实时同步任务时需要临时访问非 PostgreSQL 数据库的场景。

1.3、部署流程：

安装 tds_fdw 通常涉及以下几个步骤：

• 安装依赖：首先需要安装 freetds 及其开发库，这可以通过包管理器如 yum 或 apt 来完成。
• 下载和解压tds_fdw包：从 GitHub 仓库下载 tds_fdw 的压缩包，并在服务器上解压。
• 编译和安装：使用 make 命令编译 tds_fdw，并通过 make install 将编译后的文件安装到 PostgreSQL 的扩展目录中。
• 创建外部服务器和用户映射：在 PostgreSQL 中创建外部服务器和用户映射，以便 PostgreSQL 知道如何连接到远程数据库。
• 创建外部表：创建一个外部表来表示远程数据库中的表，这样就可以在 PostgreSQL 中查询远程数据了。

1.4、官网地址

更多信息，请查看官网地址：
https://github.com/tds-fdw/tds_fdw

二、环境准备

2.1、安装依赖

sudo yum install epel-release
sudo yum install freetds-devel
sudo yum install centos-release-scl
sudo yum install gcc make wget

2.2、下载安装包

[postgres16@Server install]$ wget https://github.com/tds-fdw/tds_fdw/archive/refs/heads/master.zip
--2024-07-25 13:32:12--  https://github.com/tds-fdw/tds_fdw/archive/refs/heads/master.zip
正在解析主机 github.com (github.com)... 20.205.243.166
正在连接 github.com (github.com)|20.205.243.166|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 302 Found
位置：https://codeload.github.com/tds-fdw/tds_fdw/zip/refs/heads/master [跟随至新的 URL]
--2024-07-25 13:32:13--  https://codeload.github.com/tds-fdw/tds_fdw/zip/refs/heads/master
正在解析主机 codeload.github.com (codeload.github.com)... 20.205.243.165
正在连接 codeload.github.com (codeload.github.com)|20.205.243.165|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：未指定 [application/zip]
正在保存至: “master.zip”

master.zip                                  [    <=>                                                                         ] 127.58K   153KB/s  用时 0.8s

2024-07-25 13:32:15 (153 KB/s) - “master.zip” 已保存 [130641]

[postgres16@Server install]$

2.3、解压安装包

[postgres16@Server install]$ unzip master.zip
Archive:  master.zip
a694e823f3df2a3fd8f56744461ea4fe4338d8ea
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