postgresql-9.1

问题 I have a postgres 9.1 database that is used by both a django website and a application server. Currently, I use the old SHA1 authentication in both system, but will upgrade to bcrypt. I have this: CREATE OR REPLACE FUNCTION random_string(length INTEGER, OUT RETURNS TEXT) AS $$ BEGIN IF length < 0 THEN raise exception 'Given length cannot be less than 0'; END IF; RETURNS = libs.gen_salt('bf', length); END; $$ LANGUAGE plpgsql; CREATE OR REPLACE FUNCTION encryp_TEXT(_TEXT TEXT, OUT RETURNS TEXT

问题 In my table there are two fields start and stop which stores the start time and stop time respectively. for example the Start time = 2014-01-01 23:43:00 and stop = 2014-01-03 03:33:00. This timestamp needs to brokendown to. 1=> 2014-01-01 23:43:00 - 2014-01-02 00:00:00, as date 2014-01-01 2=> 2014-01-02 00:00:01 - 2014-01-03 00:00:00, as date 2014-01-02 3=> 2014-01-03 00:00:01 - 2014-01-03 03:33:00, as date 2014-01-03 as three different rows. Here the problem is the difference in stop and

问题 I am selecting list of periods from database. If current row is first row then the period starts with date and I can find the interval between period start like this: SELECT ... CASE WHEN row_number() OVER(ORDER BY r.created_at ASC) = 1 THEN r.created_at - r.created_at::date ELSE NULL END AS period ... FROM mytable r How can I do the same to last row? To find the time between the r.created_at of last row and midnight of its date. I am aware of first and last functions in PostgreSQL (https:/

问题 When creating a View, I get the error function populate_geometry_columns(unknown) is not unique . A book that I'm reading used this, but its giving me an error. What could have gone wrong for me? Query: CREATE OR REPLACE VIEW ch03.vw_paris_points AS SELECT gid, osm_id, ar_num, geom, tags->'name' As place_name, tags->'tourism' As tourist_attraction FROM ch03.paris_hetero WHERE ST_GeometryType(geom) = 'ST_Point'; SELECT populate_geometry_columns('ch03.vw_paris_points'); Error: ERROR: function

问题 I want to "distribute" or "split" hours from a single task into iso weeks based on a date interval. But I do not have a clue how to do this in Postgresql. CREATE TABLE task (id int4, start date, stop date, hr int4); INSERT INTO task (id, start, stop, hr) VALUES (1, '2017-01-01','2017-01-31', 80), (2, '2017-01-01','2017-02-28', 120); The desired output of these 2 tasks should be like: The 80 hr of task 1 should be distributed into 5 weeks 201701 16 hr 201702 16 hr 201703 16 hr 201704 16 hr

问题 I need to execute a db query inorder to set the extra column "The order by column" in a many to many association table. so I need to access the db sequence from inside the Entity class and and select the nextval of the sequence and assign it to the order_by column in @prepersist lifecycle callback method. @Entity public class ProductWishlist implements Serializable { .... @Column(name="ORDER_BIT") private long orderBit; // getter setter // ....... @Prepersist public void setOrderBit

问题 Just started to learn PostgreSQL 9.1 on linux through C and libpq. For now I check connection, connect, create database, create table and other basic stuff. But I noted that during table creating PQ converts my database name to lowercase. Then I see that table names and field names are also forced to lowercase. Howewer, when I try to connect with uppercase (original) name of database I get warning that asked database don't exist. Best of all will be that all names stays as written. Is this

问题 I have a partitioned table with (what I think) the appropriate INSERT trigger and a few constraints on it. Somehow, INSERT statements insert 2 rows for each INSERT : one for the parent and one for the appropriate partition. The setup briefly is the following: CREATE TABLE foo ( id SERIAL NOT NULL, d_id INTEGER NOT NULL, label VARCHAR(4) NOT NULL); CREATE TABLE foo_0 (CHECK (d_id % 2 = 0)) INHERITS (foo); CREATE TABLE foo_1 (CHECK (d_id % 2 = 1)) INHERITS (foo); ALTER TABLE ONLY foo ADD

问题 I'm having trouble sorting the result of a query. After executing this query: SELECT id_doc_header, id_clasificacion_doc FROM cabecera_documento INNER JOIN tipo_doc USING (id_tipo_doc) INNER JOIN clasificacion_documento USING (id_clasificacion_doc) WHERE finalizado = 'f' AND cod_exp = '10-APC-2013' AND id_clasificacion_doc in(2,3,4,5) ORDER BY case when Id_clasificacion_doc = 5 THEN 5 when Id_clasificacion_doc = 3 THEN 3 when Id_clasificacion_doc = 2 THEN 2 when Id_clasificacion_doc = 4 THEN

问题 I'm trying to install plpython in my Postgres 9.1 but it crashes the server: postgres@dataserver1:~> /opt/postgres/9.1/bin/psql -d mydb psql.bin (9.1.4) Type "help" for help. mydb=# create language 'plpythonu'; The connection to the server was lost. Attempting reset: Failed. I have python 2.6.8 installed and the handler is correcty declared in the system: select tmplname, tmplhandler, tmpllibrary from pg_pltemplate where tmplname like 'plpython%' "plpythonu" | "plpython_call_handler" | "