{"Entry":{"collection":"sqlstate","key":"08001","name":"08001","aliases":[],"metadata":{"aliases":[],"case_count":1,"class_code":"08","condition_name":"sqlclient_unable_to_establish_sqlconnection","condition_names":["sqlclient_unable_to_establish_sqlconnection"],"content_hash":"65581dcdda492e27fdf157e7cc9b347893b1f50f28aa01ad1c72fa92f8a12ee9","depth":"full","editorial_review":"reviewed","evidence_tier":"observed_runtime","imported_at":"2026-09-30T17:45:26.683178+08:00","introduced":null,"known_present_by":"7.4","macros":["ERRCODE_SQLCLIENT_UNABLE_TO_ESTABLISH_SQLCONNECTION"],"name_zh":"无法建立 SQL 连接","present_in":["9.0","9.1","9.2","9.3","9.4","9.5","9.6","10","11","12","13","14","15","16","17","18","19"],"preview_in":["19"],"primary_macro":"ERRCODE_SQLCLIENT_UNABLE_TO_ESTABLISH_SQLCONNECTION","removed":null,"runtime_verification":"passed","severity_classes":["E"],"snippet_count":1,"source_rev":"english-manuals:a5abb353e53fa2f90c0570507acb7ee80d6953345afe1e7a1da450ed89d6105a","sqlstate":"08001","status":"active","summary_zh":"无法建立到目标服务器的新连接。"}},"Definition":{"Collection":"sqlstate","Key":"08001","SourceDatabase":"center","Version":"18","SourceTable":"sqlstate","SourceKey":"08001","SourceRevision":"english-manuals:a5abb353e53fa2f90c0570507acb7ee80d6953345afe1e7a1da450ed89d6105a","Facts":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"},"lang":"en","sqlstate":"08001"},"ManualEvidence":{"doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"}},"MeasuredEvidence":{}},"Text":{"Collection":"sqlstate","Key":"08001","SourceDatabase":"center","Version":"","Locale":"zh-Hans","Title":"08001 — 无法建立 SQL 连接（sqlclient_unable_to_establish_sqlconnection）","Summary":"无法建立到目标服务器的新连接。","BodyHTML":"\u003ch1\u003e08001 — 无法建立 SQL 连接\u003c/h1\u003e\n\u003ch2\u003e速览 {#at-a-glance}\u003c/h2\u003e\n\u003cp\u003eSQLSTATE \u003ccode\u003e08001\u003c/code\u003e 是 Class \u003ccode\u003e08\u003c/code\u003e 中的 \u003cstrong\u003esqlclient_unable_to_establish_sqlconnection\u003c/strong\u003e。\u003ccode\u003e08001\u003c/code\u003e 是服务器端无法建立客户端连接时使用的 SQLSTATE。选定的 \u003ccode\u003edblink_connect\u003c/code\u003e 路径 ERROR 主报文为 \u003ccode\u003ecould not establish connection\u003c/code\u003e，拒绝端口原因放在动态 DETAIL 中；这与 dblink 句柄不存在的 08003，以及启动阶段的 28000、28P01、3D000 不同。\u003c/p\u003e\n\u003ch2\u003e含义 {#meaning}\u003c/h2\u003e\n\u003cp\u003e服务器端 \u003ccode\u003edblink_connect\u003c/code\u003e 路径在 libpq 无法打开目标远端端点时发出此码。固定诊断为 ERROR，主报文是 \u003ccode\u003ecould not establish connection\u003c/code\u003e，端点和操作系统原因放在动态 DETAIL 中。它描述的是建立命名远端句柄，与句柄不存在的 08003，以及会话尚未建立就被拒绝的 28000 或 3D000 不同。\u003c/p\u003e\n\u003cp\u003e源码并不自行格式化 DETAIL：\u003ccode\u003edblink.c\u003c/code\u003e 通过 \u003ccode\u003eerrdetail_internal(\u0026#34;%s\u0026#34;, msg)\u003c/code\u003e 传递 libpq 已经组装好的错误字符串。因此，下面选定运行中的 18.6 拒绝端口文本（含主机、端口和 \u003ccode\u003eConnection refused\u003c/code\u003e）以及 10.21 的 libpq 文本都只是运行观察，不是 PostgreSQL 固定的 08001 模板。\u003c/p\u003e\n\u003ch2\u003e诊断 {#diagnosis}\u003c/h2\u003e\n\u003cp\u003e记录目标主机、端口、认证参数和完整 DETAIL。选定的 18.6/10.21 运行中，拒绝连接后本地自动提交会话保持 \u003ccode\u003eIDLE\u003c/code\u003e；随后用真实 dblink 句柄连到运行器实例，执行远端 \u003ccode\u003eSELECT 1\u003c/code\u003e，再显式断开。它证明本地恢复和句柄清理，不证明任何远端业务事务已经完成。\u003c/p\u003e\n\u003cp\u003e先判断失败阶段再重试。TCP 拒绝、DNS/TLS 失败和认证拒绝都可能由 libpq 通过这个 dblink 路径返回，必须查看动态 DETAIL，不能只按代码分类。若调用位于显式本地事务中，\u003ccode\u003eERROR\u003c/code\u003e 可能使事务在 \u003ccode\u003eROLLBACK\u003c/code\u003e（或 \u003ccode\u003eROLLBACK TO SAVEPOINT\u003c/code\u003e）前不可继续；选定案例中的自动提交 \u003ccode\u003eIDLE\u003c/code\u003e 不能推广到显式事务。dblink 句柄属于创建它的后端，应在同一会话或同一个连接池成员中检查和修复。\u003c/p\u003e\n\u003ch2\u003e处理 {#response}\u003c/h2\u003e\n\u003cp\u003e修正端点或连接参数，建立新句柄并先验证无副作用的远端探针，再发送业务操作。若失败请求可能已经越过远端边界，重试前先对账；单凭 08001 不能重放非幂等操作。\u003c/p\u003e\n\u003cp\u003e自动提交时，修正端点后可以把建连当作新的语句重试，所有者会话仍可能可用。显式事务中应先恢复本地事务，再建立并探测新句柄；只有周围工作明确设计为可继续时，保存点才适合使用。若远端操作可能已经到达目标而本地只收到错误，重放前先核对结果。\u003c/p\u003e\n\u003ch2\u003e实测诊断 {#messages}\u003c/h2\u003e\n\u003cp\u003e固定的 \u003ccode\u003edblink_connect\u003c/code\u003e 路径以 \u003ccode\u003eERROR\u003c/code\u003e 发出主报文 \u003ccode\u003ecould not establish connection\u003c/code\u003e，并通过 \u003ccode\u003eerrdetail_internal(\u0026#34;%s\u0026#34;, msg)\u003c/code\u003e 传递动态 libpq 字符串。选定的 18.6 运行中该值为 \u003ccode\u003econnection to server at \u0026#34;127.0.0.1\u0026#34;, port 1 failed: Connection refused\u003c/code\u003e 及 libpq 的后续提示；10.21 运行中则以 \u003ccode\u003ecould not connect to server: Connection refused\u003c/code\u003e 开头。这些是运行特定值，不是固定 SQLSTATE 模板。其他 producer 可能使用不同文本；只有客户端异常而没有服务器诊断，不能据此认定此 SQLSTATE。\u003c/p\u003e\n\u003cp\u003e这个 dblink 路径的严重级别固定为 \u003ccode\u003eERROR\u003c/code\u003e。选定本地会话使用自动提交，所以错误后仍为 \u003ccode\u003eIDLE\u003c/code\u003e；不要把这个状态推广到外层显式事务，或推广到未能确认结果的远端事务。\u003c/p\u003e\n\u003ch2\u003e代表案例 {#case}\u003c/h2\u003e\n\u003cp\u003e此 SQL 块创建 \u003ccode\u003edblink\u003c/code\u003e，尝试连接运行器本地的拒绝端口，然后探测所有者会话。触发点是服务器端 dblink 建连，不会在远端事务中执行工作。\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003erunner_host\u003c/code\u003e、\u003ccode\u003erunner_port\u003c/code\u003e、\u003ccode\u003erunner_db\u003c/code\u003e 和 \u003ccode\u003erunner_user\u003c/code\u003e 是运行器占位参数，手工复制时不能照字面使用。应替换为可访问的目标和有权连接它的登录角色；安装/使用 \u003ccode\u003edblink\u003c/code\u003e 以及远端登录都需要相应权限。若要复现选定的恢复观察，应在同一个所有者后端中按案例的自动提交边界执行这些语句。\u003c/p\u003e\n\u003cpre\u003e\u003ccode\u003eCREATE EXTENSION IF NOT EXISTS dblink;\nSELECT dblink_connect(\u0026#39;missing_remote\u0026#39;, \u0026#39;host=127.0.0.1 port=1 dbname=postgres connect_timeout=1\u0026#39;);\nSELECT dblink_connect(\u0026#39;working_remote\u0026#39;, \u0026#39;host=runner_host port=runner_port dbname=runner_db user=runner_user connect_timeout=5\u0026#39;);\nSELECT * FROM dblink(\u0026#39;working_remote\u0026#39;, \u0026#39;SELECT 1\u0026#39;) AS result(value integer);\nSELECT dblink_disconnect(\u0026#39;working_remote\u0026#39;);\nSELECT 1;\n\u003c/code\u003e\u003c/pre\u003e\n\u003cp\u003e18.6 运行记录 SQLSTATE 为 \u003ccode\u003e08001\u003c/code\u003e，主报文 \u003ccode\u003ecould not establish connection\u003c/code\u003e；错误后所有者会话为 \u003ccode\u003eIDLE\u003c/code\u003e。修复打开句柄返回 \u003ccode\u003eOK\u003c/code\u003e，远端返回 \u003ccode\u003e1\u003c/code\u003e，断开返回 \u003ccode\u003eOK\u003c/code\u003e；最终探针返回 \u003ccode\u003e1\u003c/code\u003e，状态 \u003ccode\u003eIDLE\u003c/code\u003e。10.21 也通过同样断言。\u003c/p\u003e\n\u003cp\u003e可下载的案例与证据投影分别是 \u003ca href=\"#cases\" rel=\"nofollow\"\u003e\u003ccode\u003e08001 案例 JSON\u003c/code\u003e\u003c/a\u003e 和 \u003ca href=\"#sources\" rel=\"nofollow\"\u003e\u003ccode\u003e作者证据\u003c/code\u003e\u003c/a\u003e。运行器清单为 \u003ccode\u003everify/cases/08001/cases.json\u003c/code\u003e；发布前会将页面 SQL 与共享注册表比对。\u003c/p\u003e\n\u003ch2\u003e版本 {#versions}\u003c/h2\u003e\n\u003cp\u003e上面的生成事实表记录锁定的目录快照和最早观察到的定义。本页自然运行范围是 PostgreSQL 18.6 与 10.21，不能据此推断所有中间版本的行为。\u003c/p\u003e\n\u003ch2\u003e相关 {#related}\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/08000/\" rel=\"nofollow\"\u003e\u003ccode\u003e08000\u003c/code\u003e — connection_exception\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/08003/\" rel=\"nofollow\"\u003e\u003ccode\u003e08003\u003c/code\u003e — connection_does_not_exist\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/28000/\" rel=\"nofollow\"\u003e\u003ccode\u003e28000\u003c/code\u003e — invalid_authorization_specification\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/3D000/\" rel=\"nofollow\"\u003e\u003ccode\u003e3D000\u003c/code\u003e — invalid_catalog_name\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003ch2\u003e来源 {#sources}\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003esrc.dblink-connect.18.6\u003c/code\u003e — \u003ccode\u003econtrib/dblink/dblink.c\u003c/code\u003e at \u003ccode\u003eREL_18_6\u003c/code\u003e commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003ee4cfaec3a0a1e5d23fded584725e0f6cf7a17321ad99e5fe046e8b7f97416f15\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/dblink/dblink.c#L335-L338\" rel=\"nofollow\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.dblink-connect.10.23\u003c/code\u003e — \u003ccode\u003econtrib/dblink/dblink.c\u003c/code\u003e at \u003ccode\u003eREL_10_23\u003c/code\u003e commit \u003ccode\u003e02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003e2d542cc722ba361bd59990aaed7fe7c0f8e147155df5e5fcd56ee03b4dd27c61\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4/contrib/dblink/dblink.c#L299-L302\" rel=\"nofollow\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.calls.REL_18_6\u003c/code\u003e / \u003ccode\u003esrc.calls.REL_10_23\u003c/code\u003e — fixed local call scans, SHA-256 \u003ccode\u003e9ee8a0e81d8f0825c5c1ae45583439859a26e602bdd4ce2f2a62aa278867ccbf\u003c/code\u003e / \u003ccode\u003e00d16d3eb01b71ccf1b245c8f3102f9d0ec9f36fb02777b8dd1b99fcb263040c\u003c/code\u003e; these scans preserve the resolved call context used by the claims.\u003c/li\u003e\n\u003c/ul\u003e\n","SourceRevision":"english-manuals:a5abb353e53fa2f90c0570507acb7ee80d6953345afe1e7a1da450ed89d6105a","ContentHash":"bea8ef0cbd4c52c4b9be7ba2c8152f4fe8ee011bb9f4612c7ccfdfaa0064c385","Payload":{"body_md":"# 08001 — 无法建立 SQL 连接\n\n## 速览 {#at-a-glance}\n\nSQLSTATE `08001` 是 Class `08` 中的 **sqlclient_unable_to_establish_sqlconnection**。`08001` 是服务器端无法建立客户端连接时使用的 SQLSTATE。选定的 `dblink_connect` 路径 ERROR 主报文为 `could not establish connection`，拒绝端口原因放在动态 DETAIL 中；这与 dblink 句柄不存在的 08003，以及启动阶段的 28000、28P01、3D000 不同。\n\n\n## 含义 {#meaning}\n\n服务器端 `dblink_connect` 路径在 libpq 无法打开目标远端端点时发出此码。固定诊断为 ERROR，主报文是 `could not establish connection`，端点和操作系统原因放在动态 DETAIL 中。它描述的是建立命名远端句柄，与句柄不存在的 08003，以及会话尚未建立就被拒绝的 28000 或 3D000 不同。\n\n源码并不自行格式化 DETAIL：`dblink.c` 通过 `errdetail_internal(\"%s\", msg)` 传递 libpq 已经组装好的错误字符串。因此，下面选定运行中的 18.6 拒绝端口文本（含主机、端口和 `Connection refused`）以及 10.21 的 libpq 文本都只是运行观察，不是 PostgreSQL 固定的 08001 模板。\n\n## 诊断 {#diagnosis}\n\n记录目标主机、端口、认证参数和完整 DETAIL。选定的 18.6/10.21 运行中，拒绝连接后本地自动提交会话保持 `IDLE`；随后用真实 dblink 句柄连到运行器实例，执行远端 `SELECT 1`，再显式断开。它证明本地恢复和句柄清理，不证明任何远端业务事务已经完成。\n\n先判断失败阶段再重试。TCP 拒绝、DNS/TLS 失败和认证拒绝都可能由 libpq 通过这个 dblink 路径返回，必须查看动态 DETAIL，不能只按代码分类。若调用位于显式本地事务中，`ERROR` 可能使事务在 `ROLLBACK`（或 `ROLLBACK TO SAVEPOINT`）前不可继续；选定案例中的自动提交 `IDLE` 不能推广到显式事务。dblink 句柄属于创建它的后端，应在同一会话或同一个连接池成员中检查和修复。\n\n## 处理 {#response}\n\n修正端点或连接参数，建立新句柄并先验证无副作用的远端探针，再发送业务操作。若失败请求可能已经越过远端边界，重试前先对账；单凭 08001 不能重放非幂等操作。\n\n自动提交时，修正端点后可以把建连当作新的语句重试，所有者会话仍可能可用。显式事务中应先恢复本地事务，再建立并探测新句柄；只有周围工作明确设计为可继续时，保存点才适合使用。若远端操作可能已经到达目标而本地只收到错误，重放前先核对结果。\n\n## 实测诊断 {#messages}\n\n固定的 `dblink_connect` 路径以 `ERROR` 发出主报文 `could not establish connection`，并通过 `errdetail_internal(\"%s\", msg)` 传递动态 libpq 字符串。选定的 18.6 运行中该值为 `connection to server at \"127.0.0.1\", port 1 failed: Connection refused` 及 libpq 的后续提示；10.21 运行中则以 `could not connect to server: Connection refused` 开头。这些是运行特定值，不是固定 SQLSTATE 模板。其他 producer 可能使用不同文本；只有客户端异常而没有服务器诊断，不能据此认定此 SQLSTATE。\n\n这个 dblink 路径的严重级别固定为 `ERROR`。选定本地会话使用自动提交，所以错误后仍为 `IDLE`；不要把这个状态推广到外层显式事务，或推广到未能确认结果的远端事务。\n\n## 代表案例 {#case}\n\n\n此 SQL 块创建 `dblink`，尝试连接运行器本地的拒绝端口，然后探测所有者会话。触发点是服务器端 dblink 建连，不会在远端事务中执行工作。\n\n`runner_host`、`runner_port`、`runner_db` 和 `runner_user` 是运行器占位参数，手工复制时不能照字面使用。应替换为可访问的目标和有权连接它的登录角色；安装/使用 `dblink` 以及远端登录都需要相应权限。若要复现选定的恢复观察，应在同一个所有者后端中按案例的自动提交边界执行这些语句。\n\n```sql\nCREATE EXTENSION IF NOT EXISTS dblink;\nSELECT dblink_connect('missing_remote', 'host=127.0.0.1 port=1 dbname=postgres connect_timeout=1');\nSELECT dblink_connect('working_remote', 'host=runner_host port=runner_port dbname=runner_db user=runner_user connect_timeout=5');\nSELECT * FROM dblink('working_remote', 'SELECT 1') AS result(value integer);\nSELECT dblink_disconnect('working_remote');\nSELECT 1;\n```\n\n\n18.6 运行记录 SQLSTATE 为 `08001`，主报文 `could not establish connection`；错误后所有者会话为 `IDLE`。修复打开句柄返回 `OK`，远端返回 `1`，断开返回 `OK`；最终探针返回 `1`，状态 `IDLE`。10.21 也通过同样断言。\n\n可下载的案例与证据投影分别是 [`08001 案例 JSON`](#cases) 和 [`作者证据`](#sources)。运行器清单为 `verify/cases/08001/cases.json`；发布前会将页面 SQL 与共享注册表比对。\n\n## 版本 {#versions}\n\n上面的生成事实表记录锁定的目录快照和最早观察到的定义。本页自然运行范围是 PostgreSQL 18.6 与 10.21，不能据此推断所有中间版本的行为。\n\n## 相关 {#related}\n\n- [`08000` — connection_exception](/wiki/sqlstate/08000/)\n- [`08003` — connection_does_not_exist](/wiki/sqlstate/08003/)\n- [`28000` — invalid_authorization_specification](/wiki/sqlstate/28000/)\n- [`3D000` — invalid_catalog_name](/wiki/sqlstate/3D000/)\n\n## 来源 {#sources}\n\n- `src.dblink-connect.18.6` — `contrib/dblink/dblink.c` at `REL_18_6` commit `724edf9bde9d356724ad384a2e196edc3c9f80f7`; fixed blob SHA-256 `e4cfaec3a0a1e5d23fded584725e0f6cf7a17321ad99e5fe046e8b7f97416f15` ([source](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/dblink/dblink.c#L335-L338)).\n- `src.dblink-connect.10.23` — `contrib/dblink/dblink.c` at `REL_10_23` commit `02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4`; fixed blob SHA-256 `2d542cc722ba361bd59990aaed7fe7c0f8e147155df5e5fcd56ee03b4dd27c61` ([source](https://github.com/postgres/postgres/blob/02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4/contrib/dblink/dblink.c#L299-L302)).\n- `src.calls.REL_18_6` / `src.calls.REL_10_23` — fixed local call scans, SHA-256 `9ee8a0e81d8f0825c5c1ae45583439859a26e602bdd4ce2f2a62aa278867ccbf` / `00d16d3eb01b71ccf1b245c8f3102f9d0ec9f36fb02777b8dd1b99fcb263040c`; these scans preserve the resolved call context used by the claims.\n","description":"PostgreSQL SQLSTATE 08001（无法建立 SQL 连接，sqlclient_unable_to_establish_sqlconnection）的源码证据、诊断与处理参考。","is_stale":false,"name":"无法建立 SQL 连接","sections":[{"anchor":"","heading":"","html":"\u0026lt;h1\u0026gt;08001 — 无法建立 SQL 连接\u0026lt;/h1\u0026gt;"},{"anchor":"at-a-glance","heading":"速览","html":"\u003cp\u003eSQLSTATE \u003ccode\u003e08001\u003c/code\u003e 是 Class \u003ccode\u003e08\u003c/code\u003e 中的 \u003cstrong\u003esqlclient_unable_to_establish_sqlconnection\u003c/strong\u003e。\u003ccode\u003e08001\u003c/code\u003e 是服务器端无法建立客户端连接时使用的 SQLSTATE。选定的 \u003ccode\u003edblink_connect\u003c/code\u003e 路径 ERROR 主报文为 \u003ccode\u003ecould not establish connection\u003c/code\u003e，拒绝端口原因放在动态 DETAIL 中；这与 dblink 句柄不存在的 08003，以及启动阶段的 28000、28P01、3D000 不同。\u003c/p\u003e"},{"anchor":"meaning","heading":"含义","html":"\u003cp\u003e服务器端 \u003ccode\u003edblink_connect\u003c/code\u003e 路径在 libpq 无法打开目标远端端点时发出此码。固定诊断为 ERROR，主报文是 \u003ccode\u003ecould not establish connection\u003c/code\u003e，端点和操作系统原因放在动态 DETAIL 中。它描述的是建立命名远端句柄，与句柄不存在的 08003，以及会话尚未建立就被拒绝的 28000 或 3D000 不同。\u003c/p\u003e\n\u003cp\u003e源码并不自行格式化 DETAIL：\u003ccode\u003edblink.c\u003c/code\u003e 通过 \u003ccode\u003eerrdetail_internal(\"%s\", msg)\u003c/code\u003e 传递 libpq 已经组装好的错误字符串。因此，下面选定运行中的 18.6 拒绝端口文本（含主机、端口和 \u003ccode\u003eConnection refused\u003c/code\u003e）以及 10.21 的 libpq 文本都只是运行观察，不是 PostgreSQL 固定的 08001 模板。\u003c/p\u003e"},{"anchor":"diagnosis","heading":"诊断","html":"\u003cp\u003e记录目标主机、端口、认证参数和完整 DETAIL。选定的 18.6/10.21 运行中，拒绝连接后本地自动提交会话保持 \u003ccode\u003eIDLE\u003c/code\u003e；随后用真实 dblink 句柄连到运行器实例，执行远端 \u003ccode\u003eSELECT 1\u003c/code\u003e，再显式断开。它证明本地恢复和句柄清理，不证明任何远端业务事务已经完成。\u003c/p\u003e\n\u003cp\u003e先判断失败阶段再重试。TCP 拒绝、DNS/TLS 失败和认证拒绝都可能由 libpq 通过这个 dblink 路径返回，必须查看动态 DETAIL，不能只按代码分类。若调用位于显式本地事务中，\u003ccode\u003eERROR\u003c/code\u003e 可能使事务在 \u003ccode\u003eROLLBACK\u003c/code\u003e（或 \u003ccode\u003eROLLBACK TO SAVEPOINT\u003c/code\u003e）前不可继续；选定案例中的自动提交 \u003ccode\u003eIDLE\u003c/code\u003e 不能推广到显式事务。dblink 句柄属于创建它的后端，应在同一会话或同一个连接池成员中检查和修复。\u003c/p\u003e"},{"anchor":"response","heading":"处理","html":"\u003cp\u003e修正端点或连接参数，建立新句柄并先验证无副作用的远端探针，再发送业务操作。若失败请求可能已经越过远端边界，重试前先对账；单凭 08001 不能重放非幂等操作。\u003c/p\u003e\n\u003cp\u003e自动提交时，修正端点后可以把建连当作新的语句重试，所有者会话仍可能可用。显式事务中应先恢复本地事务，再建立并探测新句柄；只有周围工作明确设计为可继续时，保存点才适合使用。若远端操作可能已经到达目标而本地只收到错误，重放前先核对结果。\u003c/p\u003e"},{"anchor":"messages","heading":"实测诊断","html":"\u003cp\u003e固定的 \u003ccode\u003edblink_connect\u003c/code\u003e 路径以 \u003ccode\u003eERROR\u003c/code\u003e 发出主报文 \u003ccode\u003ecould not establish connection\u003c/code\u003e，并通过 \u003ccode\u003eerrdetail_internal(\"%s\", msg)\u003c/code\u003e 传递动态 libpq 字符串。选定的 18.6 运行中该值为 \u003ccode\u003econnection to server at \"127.0.0.1\", port 1 failed: Connection refused\u003c/code\u003e 及 libpq 的后续提示；10.21 运行中则以 \u003ccode\u003ecould not connect to server: Connection refused\u003c/code\u003e 开头。这些是运行特定值，不是固定 SQLSTATE 模板。其他 producer 可能使用不同文本；只有客户端异常而没有服务器诊断，不能据此认定此 SQLSTATE。\u003c/p\u003e\n\u003cp\u003e这个 dblink 路径的严重级别固定为 \u003ccode\u003eERROR\u003c/code\u003e。选定本地会话使用自动提交，所以错误后仍为 \u003ccode\u003eIDLE\u003c/code\u003e；不要把这个状态推广到外层显式事务，或推广到未能确认结果的远端事务。\u003c/p\u003e"},{"anchor":"case","heading":"代表案例","html":"\u003cp\u003e此 SQL 块创建 \u003ccode\u003edblink\u003c/code\u003e，尝试连接运行器本地的拒绝端口，然后探测所有者会话。触发点是服务器端 dblink 建连，不会在远端事务中执行工作。\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003erunner_host\u003c/code\u003e、\u003ccode\u003erunner_port\u003c/code\u003e、\u003ccode\u003erunner_db\u003c/code\u003e 和 \u003ccode\u003erunner_user\u003c/code\u003e 是运行器占位参数，手工复制时不能照字面使用。应替换为可访问的目标和有权连接它的登录角色；安装/使用 \u003ccode\u003edblink\u003c/code\u003e 以及远端登录都需要相应权限。若要复现选定的恢复观察，应在同一个所有者后端中按案例的自动提交边界执行这些语句。\u003c/p\u003e\n\u003cpre\u003e\u003ccode class=\"language-sql\"\u003eCREATE EXTENSION IF NOT EXISTS dblink;\nSELECT dblink_connect('missing_remote', 'host=127.0.0.1 port=1 dbname=postgres connect_timeout=1');\nSELECT dblink_connect('working_remote', 'host=runner_host port=runner_port dbname=runner_db user=runner_user connect_timeout=5');\nSELECT * FROM dblink('working_remote', 'SELECT 1') AS result(value integer);\nSELECT dblink_disconnect('working_remote');\nSELECT 1;\n\u003c/code\u003e\u003c/pre\u003e\n\u003cp\u003e18.6 运行记录 SQLSTATE 为 \u003ccode\u003e08001\u003c/code\u003e，主报文 \u003ccode\u003ecould not establish connection\u003c/code\u003e；错误后所有者会话为 \u003ccode\u003eIDLE\u003c/code\u003e。修复打开句柄返回 \u003ccode\u003eOK\u003c/code\u003e，远端返回 \u003ccode\u003e1\u003c/code\u003e，断开返回 \u003ccode\u003eOK\u003c/code\u003e；最终探针返回 \u003ccode\u003e1\u003c/code\u003e，状态 \u003ccode\u003eIDLE\u003c/code\u003e。10.21 也通过同样断言。\u003c/p\u003e\n\u003cp\u003e可下载的案例与证据投影分别是 \u003ca href=\"#cases\"\u003e\u003ccode\u003e08001 案例 JSON\u003c/code\u003e\u003c/a\u003e 和 \u003ca href=\"#sources\"\u003e\u003ccode\u003e作者证据\u003c/code\u003e\u003c/a\u003e。运行器清单为 \u003ccode\u003everify/cases/08001/cases.json\u003c/code\u003e；发布前会将页面 SQL 与共享注册表比对。\u003c/p\u003e"},{"anchor":"versions","heading":"版本","html":"\u003cp\u003e上面的生成事实表记录锁定的目录快照和最早观察到的定义。本页自然运行范围是 PostgreSQL 18.6 与 10.21，不能据此推断所有中间版本的行为。\u003c/p\u003e"},{"anchor":"related","heading":"相关","html":"\u003cul\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/08000/\"\u003e\u003ccode\u003e08000\u003c/code\u003e — connection_exception\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/08003/\"\u003e\u003ccode\u003e08003\u003c/code\u003e — connection_does_not_exist\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/28000/\"\u003e\u003ccode\u003e28000\u003c/code\u003e — invalid_authorization_specification\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/wiki/sqlstate/3D000/\"\u003e\u003ccode\u003e3D000\u003c/code\u003e — invalid_catalog_name\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e"},{"anchor":"sources","heading":"来源","html":"\u003cul\u003e\n\u003cli\u003e\u003ccode\u003esrc.dblink-connect.18.6\u003c/code\u003e — \u003ccode\u003econtrib/dblink/dblink.c\u003c/code\u003e at \u003ccode\u003eREL_18_6\u003c/code\u003e commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003ee4cfaec3a0a1e5d23fded584725e0f6cf7a17321ad99e5fe046e8b7f97416f15\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/contrib/dblink/dblink.c#L335-L338\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.dblink-connect.10.23\u003c/code\u003e — \u003ccode\u003econtrib/dblink/dblink.c\u003c/code\u003e at \u003ccode\u003eREL_10_23\u003c/code\u003e commit \u003ccode\u003e02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4\u003c/code\u003e; fixed blob SHA-256 \u003ccode\u003e2d542cc722ba361bd59990aaed7fe7c0f8e147155df5e5fcd56ee03b4dd27c61\u003c/code\u003e (\u003ca href=\"https://github.com/postgres/postgres/blob/02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4/contrib/dblink/dblink.c#L299-L302\"\u003esource\u003c/a\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.calls.REL_18_6\u003c/code\u003e / \u003ccode\u003esrc.calls.REL_10_23\u003c/code\u003e — fixed local call scans, SHA-256 \u003ccode\u003e9ee8a0e81d8f0825c5c1ae45583439859a26e602bdd4ce2f2a62aa278867ccbf\u003c/code\u003e / \u003ccode\u003e00d16d3eb01b71ccf1b245c8f3102f9d0ec9f36fb02777b8dd1b99fcb263040c\u003c/code\u003e; these scans preserve the resolved call context used by the claims.\u003c/li\u003e\n\u003c/ul\u003e"}],"summary":"无法建立到目标服务器的新连接。","title":"08001 — 无法建立 SQL 连接（sqlclient_unable_to_establish_sqlconnection）","translation_source_rev":"bcac95176c2fe7f0d391146b91b48908b4102477689518a4b084f13b7858045d"}},"RequestedLocale":"zh-Hans","Fallback":false,"Versions":["10","11","12","13","14","15","16","17","18","19","20","8.1","8.2","8.3","8.4","9.0","9.1","9.2","9.3","9.4","9.5","9.6"],"Locales":["en","zh-Hans"],"Signatures":null,"Spellings":null,"SQLState":{"aliases":[],"catalogue_notes":{"earliest_observed":"7.4","formal_scope":"9.0.0..18.6","latest_observed":"18.6","matrix_scope":["9.0.23","9.1.24","9.2.24","9.3.25","9.4.26","9.5.25","9.6.24","10.23","11.22","12.22","13.23","14.24","15.19","16.15","17.11","18.6"],"pre9_scope":{"formal_tag_count":191,"maximum_release":"8.4.22","minimum_release":"7.0.0","source_definition_count":153,"source_doc_count":153,"source_file_count":306,"source_scope":"7.4..8.4 definition files; 7.0..7.3 candidate-path source gap probes","source_tag_count":153},"pre9_status":"present","preview_scope":["19beta3"]},"class":"08","class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","condition_names":["sqlclient_unable_to_establish_sqlconnection"],"definition_changes":[],"english_manuals":{"10":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"9607b57e9f639b61785677ba4d226f5889fe1d19c8bf55a3337691899a9073cd","slug":"10"},"lang":"en","sqlstate":"08001"},"11":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"3a024e38263ad77de228eed7930b842b42dc1d5cab9ca3727be8eed872ec9539","slug":"11"},"lang":"en","sqlstate":"08001"},"12":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"1444bd6a138537cd75be88a220ee9472ac528f0cfc58758e49636d85455efe98","slug":"12"},"lang":"en","sqlstate":"08001"},"13":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"4a3ef8af218e5736dfde8660ba609e84233b6b3bac7e0210ff8724cf1b27b2db","slug":"13"},"lang":"en","sqlstate":"08001"},"14":{"aliases":[],"class_name":"Connection Exception","condition_name":"sqlclient_unable_to_establish_sqlconnection","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"1c12e83304e0f4ff64c9d98ca5e3007df6756932ed19867a4fa0e0650f6c5751","slug":"14"},"lang":"en","sqlstate":"08001"},"15":{"aliases":[],"class_name":"Connection 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in a PostgreSQL release definition file is established; runtime throw/use scanning is maintained 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old definition path and same-tag documentation were locked for the observed 7.4..8.4 tags; this is a definition presence bound, not a runtime path or precise introducing commit.","scope":"pre9-definition-history","status":"definition_only"}]},"Evidence":[{"Kind":"cases","Ordinal":0,"ID":"dblink_connect_failure","ServerVersion":null,"Status":null,"Payload":{"assertions":["The selected server diagnostic has the expected SQLSTATE","The selected recovery/probe assertions pass","Runner-owned resources are cleaned up"],"case_id":"dblink_connect_failure","cleanup":"Drop the case schema with an owner connection.","has_snippet":true,"position":0,"preconditions":["A runner-owned disposable target is provisioned."],"repair":"Follow the case-specific repair statements and verify the resulting state.","trigger":"Connect to a runner-local refused port through server-side 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