postgresql_sequence – Create, drop, or alter a PostgreSQL sequence

New in version 2.9.

Synopsis

• Allows to create, drop or change the definition of a sequence generator.

Requirements

The below requirements are needed on the host that executes this module.

• psycopg2

Parameters

Parameter	Choices/Defaults	Comments
ca_cert string		Specifies the name of a file containing SSL certificate authority (CA) certificate(s). If the file exists, the server's certificate will be verified to be signed by one of these authorities. aliases: ssl_rootcert
cache integer		Cache specifies how many sequence numbers are to be preallocated and stored in memory for faster access. The minimum value is 1 (only one value can be generated at a time, i.e., no cache), and this is also the default.
cascade boolean	Choices: no ← yes	Automatically drop objects that depend on the sequence, and in turn all objects that depend on those objects. Ignored if state=present. Only used with state=absent.
cycle boolean	Choices: no ← yes	The cycle option allows the sequence to wrap around when the maxvalue or minvalue has been reached by an ascending or descending sequence respectively. If the limit is reached, the next number generated will be the minvalue or maxvalue, respectively. If false (NO CYCLE) is specified, any calls to nextval after the sequence has reached its maximum value will return an error. False (NO CYCLE) is the default.
data_type string	Choices: bigint integer smallint	Specifies the data type of the sequence. Valid types are bigint, integer, and smallint. bigint is the default. The data type determines the default minimum and maximum values of the sequence. For more info see the documentation https://www.postgresql.org/docs/current/sql-createsequence.html. Supported from PostgreSQL 10.
db string		Name of database to connect to and run queries against. aliases: database, login_db
increment integer		Increment specifies which value is added to the current sequence value to create a new value. A positive value will make an ascending sequence, a negative one a descending sequence. The default value is 1.
login_host string		Host running the database.
login_password string		The password used to authenticate with.
login_unix_socket string		Path to a Unix domain socket for local connections.
login_user string	Default: "postgres"	The username used to authenticate with.
maxvalue integer		Maxvalue determines the maximum value for the sequence. The default for an ascending sequence is the maximum value of the data type. The default for a descending sequence is -1. aliases: max
minvalue integer		Minvalue determines the minimum value a sequence can generate. The default for an ascending sequence is 1. The default for a descending sequence is the minimum value of the data type. aliases: min
newschema string		The new schema for the sequence. Will be used for moving a sequence to another schema. Works only for existing sequences.
owner string		Set the owner for the sequence.
port integer	Default: 5432	Database port to connect to. aliases: login_port
rename_to string		The new name for the sequence. Works only for existing sequences.
schema string	Default: "public"	The schema of the sequence. This is be used to create and relocate a sequence in the given schema.
sequence string / required		The name of the sequence. aliases: name
session_role string		Switch to session_role after connecting. The specified session_role must be a role that the current login_user is a member of. Permissions checking for SQL commands is carried out as though the session_role were the one that had logged in originally.
ssl_mode string	Choices: allow disable prefer ← require verify-ca verify-full	Determines whether or with what priority a secure SSL TCP/IP connection will be negotiated with the server. See https://www.postgresql.org/docs/current/static/libpq-ssl.html for more information on the modes. Default of prefer matches libpq default.
start integer		Start allows the sequence to begin anywhere. The default starting value is minvalue for ascending sequences and maxvalue for descending ones.
state string	Choices: absent present ←	The sequence state. If state=absent other options will be ignored except of name and schema.

Notes

Note

• If you do not pass db parameter, sequence will be created in the database named postgres.
• The default authentication assumes that you are either logging in as or sudo’ing to the postgres account on the host.
• To avoid “Peer authentication failed for user postgres” error, use postgres user as a become_user.
• This module uses psycopg2, a Python PostgreSQL database adapter. You must ensure that psycopg2 is installed on the host before using this module.
• If the remote host is the PostgreSQL server (which is the default case), then PostgreSQL must also be installed on the remote host.
• For Ubuntu-based systems, install the postgresql, libpq-dev, and python-psycopg2 packages on the remote host before using this module.
• The ca_cert parameter requires at least Postgres version 8.4 and psycopg2 version 2.4.3.

See Also

See also

postgresql_table – Create, drop, or modify a PostgreSQL table

The official documentation on the postgresql_table module.

postgresql_owner – Change an owner of PostgreSQL database object

The official documentation on the postgresql_owner module.

postgresql_privs – Grant or revoke privileges on PostgreSQL database objects

The official documentation on the postgresql_privs module.

postgresql_tablespace – Add or remove PostgreSQL tablespaces from remote hosts

The official documentation on the postgresql_tablespace module.

CREATE SEQUENCE reference

Complete reference of the CREATE SEQUENCE command documentation.

ALTER SEQUENCE reference

Complete reference of the ALTER SEQUENCE command documentation.

DROP SEQUENCE reference

Complete reference of the DROP SEQUENCE command documentation.

Examples

- name: Create an ascending bigint sequence called foobar in the default
        database
  postgresql_sequence:
    name: foobar

- name: Create an ascending integer sequence called foobar, starting at 101
  postgresql_sequence:
    name: foobar
    data_type: integer
    start: 101

- name: Create an descending sequence called foobar, starting at 101 and
        preallocated 10 sequence numbers in cache
  postgresql_sequence:
    name: foobar
    increment: -1
    cache: 10
    start: 101

- name: Create an ascending sequence called foobar, which cycle between 1 to 10
  postgresql_sequence:
    name: foobar
    cycle: yes
    min: 1
    max: 10

- name: Create an ascending bigint sequence called foobar in the default
        database with owner foobar
  postgresql_sequence:
    name: foobar
    owner: foobar

- name: Rename an existing sequence named foo to bar
  postgresql_sequence:
    name: foo
    rename_to: bar

- name: Change the schema of an existing sequence to foobar
  postgresql_sequence:
    name: foobar
    newschema: foobar

- name: Change the owner of an existing sequence to foobar
  postgresql_sequence:
    name: foobar
    owner: foobar

- name: Drop a sequence called foobar
  postgresql_sequence:
    name: foobar
    state: absent

- name: Drop a sequence called foobar with cascade
  postgresql_sequence:
    name: foobar
    cascade: yes
    state: absent

Return Values

Common return values are documented here, the following are the fields unique to this module:

Key	Returned	Description
cycle string	always	Shows if the sequence cycle or not. Sample: NO
data_type string	always	Shows the current data type of the sequence. Sample: bigint
increment integer	always	The value of increment of the sequence. A positive value will make an ascending sequence, a negative one a descending sequence. Sample: -1
maxvalue integer	always	The value of maxvalue of the sequence. Sample: 9223372036854775807
minvalue integer	always	The value of minvalue of the sequence. Sample: 1
newname string	on success	Shows the new sequence name after rename. Sample: barfoo
newschema string	on success	Shows the new schema of the sequence after schema change. Sample: foobar
owner string	always	Shows the current owner of the sequence after the successful run of the task. Sample: postgres
queries string	always	List of queries that was tried to be executed. Sample: ['CREATE SEQUENCE "foo"']
schema string	always	Name of the schema of the sequence Sample: foo
sequence string	always	Sequence name. Sample: foobar
start integer	always	The value of start of the sequence. Sample: 12
state string	always	Sequence state at the end of execution. Sample: present

Status

• This module is not guaranteed to have a backwards compatible interface. [preview]
• This module is maintained by the Ansible Community. [community]

Authors

• Tobias Birkefeld (@tcraxs)

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