From d545093124c759e6706c7c36a14f0cb48e799fd6 Mon Sep 17 00:00:00 2001
From: xinian <eBCmZThyqEBRX6cZZseEVK+xinian@noreply.cnb.cool>
Date: Sun, 1 Mar 2026 01:16:26 +0800
Subject: [PATCH] =?UTF-8?q?=E7=BC=96=E8=BE=91=E6=96=87=E4=BB=B6=20?=
 =?UTF-8?q?=E4=BF=AE=E6=94=B9=E8=87=AA=E5=A2=9Eid.sql?=
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---
 help/修改自增id.sql | 53 ++++++++++++++++++++++++++++++++-------------
 1 file changed, 38 insertions(+), 15 deletions(-)

diff --git a/help/修改自增id.sql b/help/修改自增id.sql
index 76150767b..362d8d4e2 100644
--- a/help/修改自增id.sql
+++ b/help/修改自增id.sql
@@ -1,26 +1,49 @@
 select setval('base_sys_user_id_seq', 10000000, false);
 
 
--- 1. 恢复原自增，解除依赖
+-- 清理旧函数
 ALTER TABLE base_sys_user
 ALTER COLUMN id SET DEFAULT nextval('base_sys_user_id_seq');
 
--- 2. 清理旧函数
-DROP FUNCTION IF EXISTS next_8digit_rand_id() CASCADE;
+DROP FUNCTION IF EXISTS shuffle_8digit() CASCADE;
 
--- 3. 【终极版】不重复 + 乱序 + 固定8位
-CREATE OR REPLACE FUNCTION next_8digit_rand_id()
+-- 8位自增 → 纯数字位置互换 → 依旧8位 → 100%不重复
+CREATE OR REPLACE FUNCTION shuffle_8digit()
 RETURNS bigint
-LANGUAGE plpgsql VOLATILE
+LANGUAGE plpgsql
+VOLATILE
 AS $$
 DECLARE
-  seq_val bigint;
-BEGIN
-  seq_val := nextval('base_sys_user_id_seq');
-  RETURN 10000000 + ((seq_val * 1103515245 + 12345) # 58329) % 90000000;
-END;
-$$;
+  seq  bigint;
+    d0 int; d1 int; d2 int; d3 int;
+      d4 int; d5 int; d6 int; d7 int;
+      BEGIN
+        seq := nextval('base_sys_user_id_seq'); -- 原本就是8位
 
--- 4. 启用
-ALTER TABLE base_sys_user
-ALTER COLUMN id SET DEFAULT next_8digit_rand_id();
+          -- 把 8 位数字拆出来：d7 d6 d5 d4 d3 d2 d1 d0
+            d7 := (seq / 10000000) % 10;
+              d6 := (seq / 1000000) % 10;
+                d5 := (seq / 100000) % 10;
+                  d4 := (seq / 10000) % 10;
+                    d3 := (seq / 1000) % 10;
+                      d2 := (seq / 100) % 10;
+                        d1 := (seq / 10) % 10;
+                          d0 := seq % 10;
+
+                            -- 固定位置互换（一对一置换，绝对不重复）
+                              RETURN
+                                   d3*10000000 +
+                                        d7*1000000 +
+                                             d1*100000 +
+                                                  d5*10000 +
+                                                       d2*1000 +
+                                                            d6*100 +
+                                                                 d0*10 +
+                                                                      d4;
+                                                                      END;
+                                                                      $$;
+
+                                                                      -- 启用
+                                                                      ALTER TABLE base_sys_user
+                                                                      ALTER COLUMN id SET DEFAULT shuffle_8digit();
+                                                                      
\ No newline at end of file