由于@a_horse_with_no_name 答案在我的情况下不起作用(可能SQL文件有问题),我修改了下面的查询,在我的情况下有效。
with sequences as (
select *
from (
select table_schema,
table_name,
column_name,
replace(replace(replace(column_default, '::regclass)', ''), '''', ''), 'nextval(', 'public.') as col_sequence
from information_schema.columns
where table_schema not in ('pg_catalog', 'information_schema') and column_default ILIKE 'nextval(%'
) t
where col_sequence is not null
), maxvals as (
select table_schema, table_name, column_name, col_sequence,
(xpath('/row/max/text()',
query_to_xml(format('select max(%I) from %I.%I', column_name, table_schema, table_name), true, true, ''))
)[1]::text::bigint as max_val
from sequences
)
select table_schema,
table_name,
column_name,
col_sequence,
coalesce(max_val, 0) as max_val,
setval(col_sequence, coalesce(max_val, 1)) --<< this will change the sequence
from maxvals;
我只是更改 pg_get_serial_sequence(format('%I.%I', table_schema, table_name), column_name) as col_sequence
为replace(replace(replace(column_default, '::regclass)', ''), '''', ''), 'nextval(', 'public.') as col_sequence
.
也许我的查询不太好,我应该使用正则表达式而不是多个替换。但就我而言,它是 100% 有效的。