I have some questions about SQL functions in postgresql:
1. Can a SQL function call another SQL function?
2. How about recursive calls?
3. Consider we have function that has a varchar argument.
CREATE FUNCTION func(varchar) RETURN void AS $$
some SQL queries.
$$ LANGUAGE SQL;
Should we define the argument, varchar or we should define the length too like varchar(20)? How about return values?
4. consider this example:
we have table named student and a function like this: it only gets a student row and add that row to the student table.
CREATE FUNCTION add_new(student) RETURNS void AS $$
INSERT INTO student VALUES ($1);
$$ LANGUAGE SQL;
I am managing a linux cluster which has been build on Platform Cluster Manager PCM 1.2.1) from IBM Platform Computing. Unfortunately somebody deteled data files of postgresql from /var/lib directory. I somehow managed to start the postmaster service again, but all the administrative commands of... (2 Replies)
I have 7 functions those need to be executed as command line inputs, I tried with below code it’s not executing function. If I run the ./script 2 then fun2 should execute , how to initiate that function I tried case and if else also, how to initiate function from command line
if
then... (8 Replies)
Hi all,
I want to install two postgreql 8.3.5 instances on same servers. already one instalce is running on default port and i need it to be installed on another port.. How ever i achived installing the second instance.. but the problem is if i create a new user using createuser in the newly... (3 Replies)
I am trying to run vacuumdb script. but it exits with an error:
"ld.so.1: vacuumdb:fatal libpq.so.5 open failed no such file or directory"
same error is with some other pstgre commands.
please, help.
thanks.
edit: it seems I need to set LD_LIBRARY_PATH properly. but how to add to it?... (0 Replies)
I am first year year student .. and i need help
i tried to work with PostgreSQL but when i open the terminal, i face problem in how to reach to PostgreSQL . always i get message it says that " can not find server " .
so what shall i do please .....:( (9 Replies)
Hi guys.
I was was designing a simple database in postgresql. I wrote a perl function in postgresql and execute it. suddenly i saw that it is running in an infinite loop. After i stopped executing of the query, i saw that CPU is in 90%+ load. I looked at process list and there it was. postgresql... (1 Reply)
Hi,
In the course of my script i have to compare SYSDATE with the 15th of the current month:
if it is greater than i should set a variable date to 15th of the next month
if less than i should set it to the 15th of the current month.
In other words the question is how to set a date variable... (2 Replies)
oar-database(1) OAR commands oar-database(1)NAME
oar-database - create/initialize/upgrade/reset/drop the oar database
SYNOPSIS
oar-database --create [OPTIONS]
oar-database --drop [OPTIONS]
oar-database --setup [OPTIONS]
oar-database --reset [OPTIONS]
DESCRIPTION
Manage the oar database.
--setup
Initialize/Upgrade an existing database.
--reset
Reset an existing database.
--create
Create and initialize a new database/user.
--drop
Drop an existing database/user.
OPTIONS
General parameters
--conf=OAR_CONF_FILE
Define the oar configuration file to use. By default /etc/oar/oar.conf is used. This file doesn't exist, the default parameters for
each value are used.
--update-conf
The database parameters given in the command line are writen to the OAR_CONF_FILE
-h,--help
Display this help.
-d,--debug
Display more information during the script execution
-f,--force-sql
Force to resume the execution even if an sql instruction fails
-y,--force-yes
This option will cause oar-database to continue without prompting if it is doins something potentially harmful
Database admin parameters
These parameters are only needed for database/user creation or removing.
--db-is-local
For --create or --drop, this option tells that the database is local. oar-database can use local admin account to execute command
(useful for postgres).
--db-admin-user=DB_ADMIN_USER
For --create or --drop, this option gives the privilegied user to use.
--db-admin-pass=DB_ADMIN_PASS
For --create or --drop, this option gives the privilegied user pass to use.
SQL parameters
By default, if not specified, all the sql parameters are taken from the OAR_CONF_FILE. It is preferable to set these values directly to
this file.
--db-type=DB_TYPE
The type of the SQL database. It can be currently, mysql or Pg (for postgresql).
--db-user=DB_USER
Connect to the database as the user DB_USER instead of the one given in OAR_CONF_FILE. By default, if OAR_CONF_FILE doesn't specify a
user, it is oar.
--db-pass=DB_PASS
Connect to the database with the password DB_PASS instead of the one given in OAR_CONF_FILE.
--db-host=DB_HOST
Connect to the database on the host DB_HOST, By default, if OAR_CONF_FILE doesn't specify a host, it is localhost.
--db-port=DB_PORT
Connect to the database on the port DB_PORT, By default, if OAR_CONF_FILE doesn't specify a port, the value depend on the DB_TYPE. if
DB_TYPE is mysql, DB_PORT is 3306. If DB_TYPE is postgresql, DB_PORT is 5432.
--db-name=DB_NAME
Connect to the database on the host DB_HOST, By default, if OAR_CONF_FILE doesn't specify a database name, it is oar.
--db-ro-user=DB_RO_USER
same as --db-user except that it is for the read only access.
--db-ro-pass=DB_RO_PASS
same as --db-pass except that it is for the read only access.
EXAMPLES
Mysql
First you need to specify the sql parameters in /etc/oar/oar.conf. These parameters will be used by oar-database.
To create a new database (assuming that the sql root password is PASS):
oar-database --create --db-admin-user root --db-admin-pass PASS
To upgrade an existing database:
oar-database --setup
Postgresql
First you need to specify the sql parameters in /etc/oar/oar.conf. These parameters will be used by oar-database. Then if your postgresql
database is on the local system, you can use the option --db-is-local (otherwise, the procedure is the same as Mysql). So oar-database will
use the postgres unix user to administrate the database (you need privilegied access to the local system).
To create a new database:
oar-database --create --db-is-local
To upgrade an existing database:
oar-database --setup
Advanced usages
To make some tests or to administrate several databases, you can also specify the sql parameters on the command line. For example:
oar-database --create --db-type=Pg --db-host=HOST--db-user=oar --db-pass=PASS
--db-admin-user=ADMIN_USER --db-admin-pass=ADMIN_PASS
will create the oar database and the oar user on the postgresql system hosted by HOST. The user ADMIN_USER must have the right to create
new databases and new roles on this system.
FILES
/usr/lib/oar/database/mysql_structure.sql, /usr/lib/oar/database/pg_structure.sql
SQL instructions for creating the structure of the oar database.
/usr/lib/oar/database/mysql_default_admission_rules.sql, /usr/lib/oar/database/pg_default_admission_rules.sql
SQL instructions for inserting the default admission rules in the oar database.
/usr/lib/oar/database/default_data.sql
SQL instructions for inserting the default data in the oar database.
/usr/lib/oar/database/mysql_reset_structure.sql, /usr/lib/oar/database/pg_reset_structure.sql
SQL instruction for emptying an existing oar database.
/usr/lib/oar/database/mysql_structure_upgrade_*.sql, /usr/lib/oar/database/pg_structure_upgrade_*.sql
SQL instructions for upgrading an existing database.
oar-database 2012-06-26 oar-database(1)