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/* ============================================================================
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时间口径迁移：本地墙钟（服务器时间）→ UTC 墙钟
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----------------------------------------------------------------------------
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背景：本项目原先全链路使用「服务器本地墙钟值」（库端 getdate() / sysdatetime()，
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应用层 LocalDateTime.now(Asia/Shanghai)）。现统一为 UTC 口径（见后端 TimeUtils）：
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· 库中 datetime 列一律存 UTC 墙钟值，新写入默认值走 sysutcdatetime()；
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· 接口出口发带 Z 的 ISO 串（"2026-09-26T02:00:00Z"），前端按浏览器时区展示；
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· 提交时前端带 Z / ±HH:mm，后端折回 UTC 墙钟值落库。
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本脚本做两件事：
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1. 默认值约束：getdate() / sysdatetime() → sysutcdatetime()；
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2. 存量数据：把每个 datetime 列的旧值从「来源时区墙钟」折成 UTC。
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幂等：执行成功后在 dbo.s_time_utc_migrated 留标记，重复执行直接跳过
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（校正类脚本重复执行会二次偏移，必须防重）。
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执行范围：每个机构库各执行一次（后端按机构切换连接库）。
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时区前提：旧数据是「中国标准时间（UTC+8）」的墙钟值 —— 现网服务器与使用方均在中国。
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若某机构库的旧值来自别的时区，把 @source_zone 换成对应 Windows 时区名即可。
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依赖：AT TIME ZONE 需要 SQL Server 2016+；建议在维护窗口执行（全表更新会持有行锁）。
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============================================================================ */
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set nocount on;
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go
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/* ---------------------------------------------------------------------------
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0. 防重标记表（首次执行时创建）
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--------------------------------------------------------------------------- */
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if object_id(N'dbo.s_time_utc_migrated', N'U') is null
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begin
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create table dbo.s_time_utc_migrated (
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b_id varchar(50) not null primary key, -- 迁移标识
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b_source_zone sysname not null, -- 旧值的来源时区
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b_migrated_at datetime2 not null, -- 执行时间（UTC）
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b_column_count int not null -- 校正的列数
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);
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end
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go
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declare @source_zone sysname = N'China Standard Time';
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declare @already int = (select count(*) from dbo.s_time_utc_migrated where b_id = 'time-utc');
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if @already > 0
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begin
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print N'[跳过] 时间口径迁移已执行过（见 dbo.s_time_utc_migrated 的 time-utc 标记）。';
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end
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else
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begin
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declare @table sysname, @column sysname, @type sysname, @sql nvarchar(max);
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/* -----------------------------------------------------------------------
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1. 默认值约束：getdate() / sysdatetime() → sysutcdatetime()
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----------------------------------------------------------------------- */
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declare @constraint sysname;
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declare defaults_cursor cursor local fast_forward for
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select dc.name, t.name, c.name
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from sys.default_constraints dc
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join sys.tables t on t.object_id = dc.parent_object_id
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join sys.columns c on c.object_id = dc.parent_object_id and c.column_id = dc.parent_column_id
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where t.is_ms_shipped = 0
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and (dc.definition like '%getdate()%' or dc.definition like '%sysdatetime()%')
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and dc.definition not like '%sysutcdatetime%';
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open defaults_cursor;
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fetch next from defaults_cursor into @constraint, @table, @column;
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while @@fetch_status = 0
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begin
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set @sql = N'alter table dbo.' + quotename(@table)
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+ N' drop constraint ' + quotename(@constraint) + N';'
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+ N'alter table dbo.' + quotename(@table)
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+ N' add constraint ' + quotename(@constraint)
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+ N' default sysutcdatetime() for ' + quotename(@column) + N';';
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execute sp_executesql @sql;
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print N'[默认值] ' + @table + N'.' + @column + N' → sysutcdatetime()';
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fetch next from defaults_cursor into @constraint, @table, @column;
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end
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close defaults_cursor;
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deallocate defaults_cursor;
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/* -----------------------------------------------------------------------
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2. 存量数据：每个 datetime 列从「@source_zone 墙钟」折成 UTC
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AT TIME ZONE 先给旧值贴上来源时区，再换算到 UTC —— 不写死 -8，
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将来某个库的旧值来自其他时区时改 @source_zone 即可。
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----------------------------------------------------------------------- */
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declare @column_count int = 0;
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declare time_columns cursor local fast_forward for
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select t.name, c.name, ty.name
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from sys.columns c
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join sys.tables t on t.object_id = c.object_id
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join sys.schemas s on s.schema_id = t.schema_id
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join sys.types ty on ty.user_type_id = c.user_type_id
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where s.name = 'dbo'
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and t.is_ms_shipped = 0
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and c.is_computed = 0
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and t.name <> 's_time_utc_migrated'
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and ty.name in ('datetime', 'datetime2', 'smalldatetime')
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order by t.name, c.column_id;
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open time_columns;
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fetch next from time_columns into @table, @column, @type;
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while @@fetch_status = 0
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begin
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set @sql = N'update dbo.' + quotename(@table)
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+ N' set ' + quotename(@column)
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+ N' = cast(((' + quotename(@column) + N' at time zone @zone) at time zone ''UTC'') as '
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+ @type + N')'
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+ N' where ' + quotename(@column) + N' is not null;';
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execute sp_executesql @sql, N'@zone sysname', @zone = @source_zone;
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set @column_count = @column_count + 1;
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fetch next from time_columns into @table, @column, @type;
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end
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close time_columns;
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deallocate time_columns;
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/* -----------------------------------------------------------------------
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3. 留痕
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----------------------------------------------------------------------- */
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insert into dbo.s_time_utc_migrated (b_id, b_source_zone, b_migrated_at, b_column_count)
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values ('time-utc', @source_zone, sysutcdatetime(), @column_count);
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print N'[完成] 已按 ' + @source_zone + N' 校正 ' + cast(@column_count as varchar(10))
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+ N' 个时间列；抽查 b_created_at / b_occurdatetime 与界面展示是否一致。';
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end
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go
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