[英]In Postgres 12, how to change PK columns into IDENTITY using dynamic SQL?
So I migrated my database from SQLite to Postgres 12 using pgloader 3.4.1, and for some reason the PK columns across all tables aren't sequential/auto-increment.因此,我使用 pgloader 3.4.1 将我的数据库从 SQLite 迁移到 Postgres 12,并且由于某种原因,所有表中的 PK 列都不是顺序/自动递增的。 They're indexed as NOT NULL (correct) and bigint or int (correct), but they don't contain a default value, so I need to manually change them to IDENTITY type.
它们的索引为 NOT NULL(正确)和 bigint 或 int(正确),但它们不包含默认值,因此我需要手动将它们更改为 IDENTITY 类型。
However, I need to leave alone some varchar PK columns.但是,我需要留下一些 varchar PK 列。
So far, I've tried this in psql:到目前为止,我已经在 psql 中尝试过:
do
$$
declare
l_rec record;
l_sql text;
l_table text;
begin
for l_rec in select table_schema, table_name, column_name, data_type, is_nullable
from information_schema.columns
where data_type in ('bigint', 'integer')
and is_nullable = 'NO'
and is_generated = 'NO'
and is_identity = 'NO'
loop
l_sql := format('alter table %I.%I alter %I add generated always as identity',
l_rec.table_schema,
l_rec.table_name,
l_rec.column_name);
execute l_sql;
l_table := concat(quote_ident(l_rec.table_schema), '.', quote_ident(l_rec.table_name));
l_sql := format('select setval(pg_get_serial_sequence(%L, %L), max(%I)) from %I.%I',
l_table,
quote_ident(l_rec.column_name),
l_rec.column_name,
l_rec.table_schema,
l_rec.table_name);
execute l_sql;
end loop;
end;
$$
;
It spit out "DO," so I assume it must have worked, but when I use \d table_name
to view the schema, it still doesn't have a default value.它吐出“DO”,所以我认为它一定有效,但是当我使用
\d table_name
查看架构时,它仍然没有默认值。
Help please?请帮忙?
The error lies in this line:错误在于这一行:
is_generated = 'NO'
is_generated only takes "ALWAYS" or "NEVER" as values. is_generated 仅将“ALWAYS”或“NEVER”作为值。
I was lucky enough to catch that in the Postgres documentation.我很幸运在 Postgres 文档中发现了这一点。
Hope this helps someone else!希望这对其他人有帮助!
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