upsert

问题 Look here for a similar example: https://stackoverflow.com/a/33247409/1575066 from elasticsearch import Elasticsearch es = Elasticsearch("localhost:9200") es.update(index='test',doc_type='test1',id='1',body={'doc' {'username':'Tom'},'doc_as_upsert':True}) But now imagine the goal is to append to an array or to increment a previous value (without having to get the document first). If you go with official requests, this is in the documentation: POST /website/pageviews/1/_update { "script" :

问题 I am trying to test the new PostgreSQL upsert syntax with the following test code, but get the syntax error: test=> CREATE TABLE test1 ( test(> key1 integer PRIMARY KEY check (key1 > 0), test(> key2 integer check (key2 > 0) test(> ); CREATE TABLE test=> CREATE OR REPLACE FUNCTION upsert(IN in_json_array jsonb) test-> RETURNS void AS test-> $func$ test$> UPDATE test1 t SET test$> t.key1 = (obj->>'key1')::int, test$> t.key2 = (obj->>'key2')::int test$> FROM JSONB_ARRAY_ELEMENTS(in_json_array)

问题 Straight from the manual, here's the canonical example of merge_db in PostgreSQL: CREATE TABLE db (a INT PRIMARY KEY, b TEXT); CREATE FUNCTION merge_db(key INT, data TEXT) RETURNS VOID AS $$ BEGIN LOOP -- first try to update the key UPDATE db SET b = data WHERE a = key; IF found THEN RETURN; END IF; -- not there, so try to insert the key -- if someone else inserts the same key concurrently, -- we could get a unique-key failure BEGIN INSERT INTO db(a,b) VALUES (key, data); RETURN; EXCEPTION

问题 I'm using Elasticsearch python client as http://elasticsearch-py.readthedocs.org/ I tried hard but still could not find the update api with upsert. Could anyone give me an example with ES python client upsert api please. 回答1: The example code as following: from elasticsearch import Elasticsearch es = Elasticsearch("localhost:9200") es.update(index='test',doc_type='test1',id='1',body={'doc':{'username':'Tom'},'doc_as_upsert':True}) if without doc_as_upsert=true it would throw exception when

问题 I got a trouble when a try to execute a trigger. Let's suppose we have 2 tables and I want to copy data from table A to table B but each table got a unique constraint . create table test1 ( test_name varchar); create unique index test1_uc on test1 USING btree (test_name); create table test2 ( test_name2 varchar); create unique index test2_uc on test2 USING btree (test_name2); CREATE OR REPLACE FUNCTION trig_test() RETURNS trigger AS $$ BEGIN IF pg_trigger_depth() <> 1 THEN RETURN NEW; END IF;

问题 I am using pyodbc to update an Access database. I need the functionality of an UPSERT. ON DUPLICATE KEY UPDATE doesn't exist in Access SQL, and REPLACE is not an option since I want to keep other fields. There are a lot of suggestions out there how to solve that, so this is the solution which I put together: for table_name in data_source: table = data_source[table_name] for y in table: if table_name == "whatever": SQL_UPDATE = "UPDATE {} set [Part Name] = '{}', [value] = {}, [code] = {},

问题 I have this pattern in a number of stored procedures -- Table1 [id] [int] IDENTITY(1,1) NOT NULL [data] [varchar](512) NULL [count] INT NULL -- 'data' is unique, with a unique index on 'data' in 'Table1' BEGIN TRY INSERT INTO Table1 (data, count) SELECT @data,1; END TRY BEGIN CATCH UPDATE Table1 SET count = count + 1 WHERE data = @data; END CATCH I've been slammed before for using this pattern You should never have exception "catching" in your normal logic flow. (Thus why it is called an

问题 I want a UPSERT ( UPDATE if exists, else insert) on a MySQL table with these fields: CREATE TABLE item ( uid int(11) NOT NULL AUTO_INCREMENT, timestamp int(11) NOT NULL DEFAULT '0', category1 int(11) NOT NULL DEFAULT '0', category2 int(11) NOT NULL DEFAULT '0', counter int(11) NOT NULL DEFAULT '1', PRIMARY KEY (`uid`) ) This table is already in productive use, and the combination of (timestamp,category1,category2) is for my INSERT unique, but not for the whole table content. That's the reason

问题 I want to execute a complex upsert, made by the following elements: query on a field f by regex update of the same field f (that is specified in the query object too) Like this: db.coll.update({ prop: /valueprop/i } , { $addToSet:{ prop:'a value' } } , true, false) My expectation would be that if the document does not exist in the collection it is inserted with prop field equals to 'a value'; in other words it should insert a document with value of prop field that is the one specified in the

问题 I'm just wondering if there's way to check if a given document is updated or inserted in MongoDB after a upsert operation in Java: DBCollection col = getCollection(); // either this col.findAndModify(query, null, null, false, contact, false, true); // or this WriteResult wr = col.update(query, contact, true, false); 回答1: Generally, WriteResult will hold information regarding whether it was successful or not; if successful, the document will be there. You could also do a simple col.count(new