Re: clone_schema function - Mailing list pgsql-general
Attached is hopefully the final version of
FUNCTION clone_schema(text, text, boolean)
This function now does the following:
1. Checks that the source schema exists and the destination does not.
2. Creates the destination schema
3. Copies all sequences, tables, indexes, rules, triggers, data(optional),
views & functions from the source schema to the destination schema
4. Optionally copies records from source schema tables to destination tabled. (boolean)
5. Copies comments for source schema and all sequences, tables, functions, rules and triggers;
If you discover a problem with this function, then kindly advise me what it is
and attach a script (SQL dump) to duplicate it. If you also have a fix, that is
even better.
However, if you "think" there is a problem that occurs when
A. The moon is full
B. You have blood type A/B negative
C. You have a table the same name as your database and schema
D. All you tables have column "id" in them
E. You've had 16 beers and 4 oxycodones
F. Your meth supplier raised the price
then do not contact me. Instead, run, do not walk, immediately to your
psychologist, as you have serious issues in addition to database design problems
and you should not use this function under any circumstance.
CAVEAT EMPTOR!
The only known problem with this script is if functions in the source schema
have a SELECT using the form of tablename.columm, and tablename is the same
as source schema, then tablename will be changed to destination schema name.
However, since good developers and DBA's use the form of alias.column, this
should rarely be a problem.
FUNCTION clone_schema(text, text, boolean)
This function now does the following:
1. Checks that the source schema exists and the destination does not.
2. Creates the destination schema
3. Copies all sequences, tables, indexes, rules, triggers, data(optional),
views & functions from the source schema to the destination schema
4. Optionally copies records from source schema tables to destination tabled. (boolean)
5. Copies comments for source schema and all sequences, tables, functions, rules and triggers;
If you discover a problem with this function, then kindly advise me what it is
and attach a script (SQL dump) to duplicate it. If you also have a fix, that is
even better.
However, if you "think" there is a problem that occurs when
A. The moon is full
B. You have blood type A/B negative
C. You have a table the same name as your database and schema
D. All you tables have column "id" in them
E. You've had 16 beers and 4 oxycodones
F. Your meth supplier raised the price
then do not contact me. Instead, run, do not walk, immediately to your
psychologist, as you have serious issues in addition to database design problems
and you should not use this function under any circumstance.
CAVEAT EMPTOR!
The only known problem with this script is if functions in the source schema
have a SELECT using the form of tablename.columm, and tablename is the same
as source schema, then tablename will be changed to destination schema name.
However, since good developers and DBA's use the form of alias.column, this
should rarely be a problem.
On Tue, Sep 15, 2015 at 12:37 PM, Melvin Davidson <melvin6925@gmail.com> wrote:
are existing tools that do that, albeit they are not free.2. What you request is currently beyond my capability. Not to mention that there alreadyDavid,1. I am still working also on bringing over the comments for various objects
Yes, it would be nice, butOn Tue, Sep 15, 2015 at 12:27 PM, David G. Johnston <david.g.johnston@gmail.com> wrote:To make the casual user's life easier, in the face of this reality, it would nice if the routine would generate a reasonably attempted "diff" between the two so that all changes can be reviewed in a structured manner aided by correctly configured tools and advice.On Tue, Sep 15, 2015 at 12:20 PM, Melvin Davidson <melvin6925@gmail.com> wrote:I will ignore all further comments.schema, and function that fails for reasonable , practical designUnless you care to take the time to provide a fullIgor,Naming a table the same as a schema is a very silly idea.
I understand your point, however, I have spent over a week making a function
that previously did very little do a lot.On Tue, Sep 15, 2015 at 9:55 AM, Igor Neyman <ineyman@perceptron.com> wrote:
That is correct. But table old will NOT be converted to new because
only the schema name is converted. And table "old" WILL exist because it will also be copied.
I have tested and it works properly.
Please do not provide hypothetical examples. Give me an actual working example that causes the problem.
This statement:
SELECT old.field FROM old.old;
selects column “field” from table “old” which is in schema “old”.
Your script converts it into:
SELECT new.field FROM new.old
which will try to select column “field” from table “old” in schema “new”.
Again:
SELECT new.field
means select column “field” from table “new”, which does not exists.
Not sure, what other example you need.
Regards,
Igor Neyman
--Melvin Davidson
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.
--Melvin Davidson
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.
--
Melvin Davidson
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.
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