Just a quick and simple question: in PostgreSQL, how do you list the names of all stored functions/stored procedures using a table using just a SELECT statement, if possible? If a simple SELECT is insufficient, I can make do with a stored function.
My question, I think, is somewhat similar to this other question, but this other question is for SQL Server 2005:
List of Stored Procedure from Table
(optional) For that matter, how do you also list the triggers and constraints that use the same table in the same manner?
SELECT p.proname
FROM pg_catalog.pg_namespace n
JOIN pg_catalog.pg_proc p
ON p.pronamespace = n.oid
WHERE n.nspname = 'public';
SELECT proname, prosrc
FROM pg_catalog.pg_namespace n
JOIN pg_catalog.pg_proc p
ON pronamespace = n.oid
WHERE nspname = 'public';
If you are using psql, try \df
From the man page:
Tip
To look up functions taking arguments or returning values of a specific type, use your pager's search capability to scroll through the \df output.
Running \set ECHO_HIDDEN will reveal what \df is running behind the scenes.
Same as #quassnoi and #davidwhthomas, except I added the argument names in there:
SELECT proname, proargnames, prosrc
FROM pg_catalog.pg_namespace n
JOIN pg_catalog.pg_proc p
ON pronamespace = n.oid
WHERE nspname = 'public';
If the purpose behind listing the functions is to clean them up or iterate a new function with a changing params list, you will frequently need to drop functions:
DROP FUNCTION <name>(<args>);
By adding proargnames, I am able to construct the applicable function name for the drop.
Additionally, it's nice to see a more complete picture when evaluating the functions.
You can use the standard information_schema schema to get metadata about your database (it's in the SQL standard, so it should work the same way in different database systems). In this case you want information_schema.routines.
Excluding the system stuff:
select proname from pg_proc where proowner <> 1;
Have a look at my recipe. It reads functions and triggers. It is based on informations from: Extracting META information from PostgreSQL (INFORMATION_SCHEMA)
Please change the schema_name and table_name in the below query:
SELECT n.nspname AS schema_name
, p.proname AS function_name
, pg_get_function_arguments(p.oid) AS args
, pg_get_functiondef(p.oid) AS func_def
FROM pg_proc p
JOIN pg_namespace n ON n.oid = p.pronamespace
AND n.nspname = 'schema_name'
AND p.prosrc like '%table_name%'
Since the table name is case sensitive, so need to define the exact table name.
For retrieving the argument types of the functions, which are required when referencing the function in ALTER -- using oldevectortypes worked well for me.
See How can I get a list of all functions stored in the database of a particular schema in PostgreSQL?
Related
I have a Firebird query which I should rewrite into PostgreSQL code.
SELECT TRIM(RL.RDB$RELATION_NAME), TRIM(FR.RDB$FIELD_NAME), FS.RDB$FIELD_TYPE
FROM RDB$RELATIONS RL
LEFT OUTER JOIN RDB$RELATION_FIELDS FR ON FR.RDB$RELATION_NAME = RL.RDB$RELATION_NAME
LEFT OUTER JOIN RDB$FIELDS FS ON FS.RDB$FIELD_NAME = FR.RDB$FIELD_SOURCE
WHERE (RL.RDB$VIEW_BLR IS NULL)
ORDER BY RL.RDB$RELATION_NAME, FR.RDB$FIELD_NAME
I understand SQL, but have no idea, how to work with this system tables like RDB$RELATIONS etc. It would be really great if someone helped me with this, but even some links with this tables explanation will be OK.
This piece of query is in C++ code, and when I'm trying to do this :
pqxx::connection conn(serverAddress.str());
pqxx::work trans(conn);
pqxx::result res(trans.exec(/*there is this SQL query*/));//and there is a mistake
it writes that:
RDB$RELATIONS doesn't exist.
Postgres has another way of storing information about system content. This is called System Catalogs.
In Firebird your query basically returns a row for every column of a table in every schema with an additional Integer column that maps to a field datatype.
In Postgres using system tables in pg_catalog schema something similar can be achieved using this query:
SELECT
TRIM(c.relname) AS table_name, TRIM(a.attname) AS column_name, a.atttypid AS field_type
FROM pg_class c
LEFT JOIN pg_attribute a ON
c.oid = a.attrelid
AND a.attnum > 0 -- only ordinary columns, without system ones
WHERE c.relkind = 'r' -- only tables
ORDER BY 1,2
Above query does return system catalogs as well. If you'd like to exclude them you need to add another JOIN to pg_namespace and a where clause with pg_namespace.nspname <> 'pg_catalog', because this is the schema where system catalogs are stored.
If you'd also like to see datatype names instead of their representative numbers add a JOIN to pg_type.
Information schema consists of collection of views. In most cases you don't need the entire SQL query that stands behind the view, so using system tables will give you better performance. You can inspect views definition though, just to get you started on the tables and conditions used to form an output.
I think you are looking for the information_schema.
The tables are listed here: https://www.postgresql.org/docs/current/static/information-schema.html
So for example you can use:
select * from information_schema.tables;
select * from information_schema.columns;
I have this function:
SELECT n.nspname AS schema_name
,p.proname AS function_name
,pg_get_function_arguments(p.oid) AS args
,pg_get_functiondef(p.oid) AS func_def
FROM (SELECT oid, * FROM pg_proc p WHERE NOT p.proisagg) p
JOIN pg_namespace n ON n.oid = p.pronamespace
WHERE n.nspname !~~ 'pg_%'
AND n.nspname <> 'information_schema'
AND pg_get_functiondef(p.oid) ~ '\mTableName\M';
it gives me a list of functions that uses TableName. However it doesn't ignore notes. For example if in function A there will be a line like:
-- select * from TableName
it will show A in the result even though its a note and A doesn't really uses TableName.
How can I make a query that does the same thing but ignore all notes?
You may find everything you need directly on this wiki page : https://wiki.postgresql.org/wiki/Pg_depend_display
There is all sorts of dependency views depending on you PostgreSQL version.
I'm aware of the psql command that will list these, but I'm attempting to write an extension for Oracle's SQL Developer that will list them on the left-hand navigator panel. The XML format requires a select statement.
For example purposes, I'll include the code I cooked up for sequences:
<sql constrained="true">
<![CDATA[SELECT relname FROM pg_class JOIN pg_namespace ON pg_namespace.oid = pg_class.relnamespace WHERE relkind = 'S' AND nspname = :SCHEMA]]>
</sql>
I've attempted to figure it out for myself, but I don't see anything with my test domain names in pg_class or any other of those internal tables (though it must be in one, somewhere).
Does anyone have a hint?
Asked too soon... here's a select query that will return domains from a specific schema:
SELECT typname FROM pg_catalog.pg_type JOIN pg_catalog.pg_namespace ON pg_namespace.oid = pg_type.typnamespace WHERE typtype = 'd' AND nspname = 'someschema'
Minor tweaking can also return enums, ranges, and composites/rows. More information in the docs.
Just moved from SSMS to Redshift (using DBeaver) and am wondering if there's a good option for getting table descriptions. In SQL server you could write a great query against information_schema to pull column names, datatypes, etc. Any similar options in Redshift?
The INFORMATION_SCHEMA tables are available in Redshift.
It may be that your chosen query tool (DBeaver) is hiding the schema in the GUI. However you should still be able to query them as normal.
This is certainly the case for me when I'm using Navicat. If you want to see the schema then it is visible when using SQL Workbench or SQuirreL.
2016-04-04: AWS have created a much simpler view that provides complete CREATE TABLE statements including all the Redshift specific stuff. Get them from here: https://github.com/awslabs/amazon-redshift-utils/tree/master/src/AdminViews
Looks like you are looking for something like this : http://rocky-says.blogspot.com/2015/01/amazon-redshift-generate-table-ddl.html
Here is the query that will help you : Just replace the < TABLE > and < SCHEMA> with your table name and Schema
SELECT DISTINCT n.nspname AS schemaname
,c.relname AS tablename
,a.attname AS COLUMN
,a.attnum AS column_position
,pg_catalog.format_type(a.atttypid, a.atttypmod) AS TYPE
,pg_catalog.format_encoding(a.attencodingtype) AS encoding
,a.attisdistkey AS distkey
,a.attsortkeyord AS sortkey
,a.attnotnull AS notnull
,a.attencodingtype AS compression
,con.conkey AS primary_key_column_ids
,con.contype AS con_type
FROM pg_catalog.pg_namespace n
,pg_catalog.pg_class c
,pg_catalog.pg_attribute a
,pg_constraint con
,pg_catalog.pg_stats stats
WHERE n.oid = c.relnamespace
AND c.oid = a.attrelid
AND a.attnum > 0
AND c.relname NOT LIKE '%pkey'
AND lower(c.relname) = ''
AND n.nspname = ''
AND c.oid = con.conrelid(+)
ORDER BY A.ATTNUM
;
I need the create scripts for PostgreSQL database objects.
I have not access to pg_dump. So I have to get everything with SQL queries. How could I do this?
To get the definition of a function use pg_get_functiondef():
select pg_get_functiondef(oid)
from pg_proc
where proname = 'foo';
There are similar functions to retrieve the definition of an index, a view, a rule and so on. For details see the manual: http://www.postgresql.org/docs/current/static/functions-info.html
Getting the definition of a user type is a bit more tricky. You will need to query information_schema.attributes for that:
select attribute_name, data_type
from information_schema.attributes
where udt_schema = 'public'
and udt_name = 'footype'
order by ordinal_position;
From that you need to re-assemble the create type statement.
For more details you will need to read through the documentation of the system catalog: http://www.postgresql.org/docs/current/static/catalogs.html
But you should prefer information_schema views if they return the same information.
You will find psql -E instrumental in your quest for those queries.
It displays the queries psql uses when executing its backslash-commands - like \df+ myfunc for details about this function.
Here is a complete sample query using pg_get_functiondef:
WITH funcs AS (
SELECT
n.nspname AS schema
,proname AS sproc_name
,proargnames AS arg_names
,t.typname AS return_type
,d.description
,pg_get_functiondef(p.oid) as definition
FROM pg_proc p
JOIN pg_type t on p.prorettype = t.oid
JOIN pg_description d on p.oid = d.objoid
JOIN pg_namespace n on n.oid = p.pronamespace
WHERE n.nspname = 'some_schema_name_here'
)
SELECT *
FROM funcs
;;
Note, you should obviously specify the schema name, (or "public" if you are using that schema)
You can also do \sf to see the user defined function in psql