dblink

问题 I am trying to determine what this code is doing (Oracle SQL) — especially the at-sign exclamation mark in the from clause. INSERT INTO "LOCATIONS" "A1" ("LOCATION_ID", "SEQUENCE", "POINT_TYPE") SELECT "A2"."LOCATION_ID", "A2"."SEQUENCE", "A2"."LOCATION_TYPE", "A2"."POINT_TYPE" FROM "LOCATIONS"@! "A2" WHERE NOT EXISTS (SELECT 1 FROM "LOCATIONS" "A3" WHERE "A3"."LOCATION_ID" = "A2"."LOCATION_ID") 回答1: This is a reverse database link to the original database, where the query is executed. The

问题 If you create an Oracle dblink you cannot directly access LOB columns in the target tables. For instance, you create a dblink with: create database link TEST_LINK connect to TARGETUSER IDENTIFIED BY password using 'DATABASESID'; After this you can do stuff like: select column_a, column_b from data_user.sample_table@TEST_LINK Except if the column is a LOB, then you get the error: ORA-22992: cannot use LOB locators selected from remote tables This is a documented restriction. The same page

问题 I am working in a Java application where I need to execute these the two queries (as Strings in java) at the same time and rollback the transaction if there where errors. SELECT dblink_exec('hostaddr=xxx.xx.xxx.xxx port=5432 dbname=bdname user=myuser password=mypass connect_timeout=2', 'INSERT INTO table3(field4) VALUES (5)') AS result; SELECT dblink_exec('hostaddr=xxx.xx.xxx.xxx port=5432 dbname=bdname user=myuser password=mypass connect_timeout=2', 'UPDATE table1 SET field2 = field2 + 3.0

问题 I'm not sure if its standard SQL: INSERT INTO tblA (SELECT id, time FROM tblB WHERE time > 1000) What I'm looking for is: what if tblA and tblB are in different DB Servers . Does PostgreSql gives any utility or has any functionality that will help to use INSERT query with PGresult struct I mean SELECT id, time FROM tblB ... will return a PGresult* on using PQexec . Is it possible to use this struct in another PQexec to execute an INSERT command. EDIT: If not possible then I would go for

问题 So I wrote this method that aims at querying to another remote database with the same structure using dblink (inspired from this post Specify dblink column definition list from a local existing type and this one Refactor a PL/pgSQL function to return the output of various SELECT queries) CREATE OR REPLACE FUNCTION select_remote(_table anyelement) RETURNS SETOF anyelement AS $func$ DECLARE _dblink_schema text; _cols text; _server text := 'host=ngrok.com port=45790 user=postgres password

问题 I created a trigger to replicate inserts from a table 'mytable_db1' in database1 into the same table 'mytable_db2' on database2. Both databases are on the same server. CREATE OR REPLACE FUNCTION trigger_osm_test_insert() RETURNS trigger AS $BODY$ BEGIN PERFORM dblink_connect('db2', 'dbname=xxx port=5432 user=myusr password=xxx'); PERFORM dblink_exec('db2', 'insert into test.mytable_db2 (osm_id, name, name_eng, name_int, type, z_order, population, last_update, country, iso3, shape) values ('|

问题 I have a View and want to insert this via DB Link. But it's give error "ORA-02070: database does not support in this context". How can I solve this error ? CREATE OR REPLACE FORCE VIEW V_TEST ( OBJECT_ID, SEQUENCE, SCHEMA_NAME, OBJECT_NAME, OBJECT_TYPE_NAME, LINE, POSITION, ERROR_MESSAGE, CREATE_DATE ) AS SELECT dbaObjects.OBJECT_ID, dbaErrors.SEQUENCE, dbaErrors.OWNER AS SCHEMA_NAME, dbaErrors.NAME AS OBJECT_NAME, dbaErrors.TYPE AS OBJECT_TYPE_NAME, dbaErrors.LINE, dbaErrors.POSITION,

问题 So I want to create a database link in oracle, my username is jefferson and I want to connect trough opms so I was told to do this. create database link tmpp connect to jefferson[opms] identified by nothing using $something ; For some reason when I try to use [] syntax it just tells me indentified is missing. Why is this not working, I was told to do it this way but I can't find any help in the official documentation for [] usage or the correct syntax. 回答1: You can create a fixed-user

问题 Referring to How to execute an Oracle stored procedure via a database link, it does not work in my case. I don't know what I am missing. I have a SQL Server instance and Oracle database in the same computer. And database link is created in the Oracle, called ss . And there is a stored procedure in SQL Server called dbo.test_proc create proc dbo.test_proc as print 'testing'; Apparently, it does not have parameter and no return value. I tried to call the stored procedure in Oracle via database

问题 We have an Oracle DBMS (11g) and the following configuration: A DB user "MYUSER" Two schemas "MYUSER" and "SCHEMA_B" User "MYUSER" can access "SCHEMA_B" and has READ permissions on its tables A public DB link "DB_LINK" located in "SCHEMA_B" The DB_LINK is working when using the DB user "SCHEMA_B" directly Question : When logged on as "MYUSER", what is the correct syntax to access tables using the DB link of "SCHEMA_B"? Is it possible to do so at all? I already tried several constellations,