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clojurians | clojure | Sure - it's hard for me to say without seeing a more detailed curriculum of course, just a thought. I think people could save a lot of trouble if they were more pragmatic about using host interop | 2017-11-23T16:13:49.000054 | Margaret |
clojurians | clojure | Pretty sure you do `space 1` for the first pane, `space 2` for the second and so on - unless I misunderstand the question. | 2017-11-23T16:15:38.000160 | Rene |
clojurians | clojure | Hi, I tried to do something like this in jdbc and get an Exception:
```
(j/db-do-prepared (:user-db @g-config) ["select
case
when (select 1 from user_favorstocks where uid=1823 and stockid='600123.SH') is not null
then (select 8)
else (select 5)
end as tmp"])
```
`SQLException SQL String can not be NULL com.mysql.jdbc.SQLError.createSQLException (SQLError.java:957)` | 2017-11-24T03:27:39.000279 | Tari |
clojurians | clojure | what could be the reason? | 2017-11-24T03:28:09.000026 | Tari |
clojurians | clojure | <@Tari>, don't you need to prepare the statement first? | 2017-11-24T03:29:55.000188 | Fe |
clojurians | clojure | maybe not | 2017-11-24T03:30:17.000402 | Tari |
clojurians | clojure | `The sql parameter can either be a SQL string or a PreparedStatement.` in clojure.java.jdbc doc | 2017-11-24T03:30:39.000033 | Tari |
clojurians | clojure | and here is the test code: | 2017-11-24T03:30:55.000294 | Tari |
clojurians | clojure | ```
(deftest test-do-prepared4
(doseq [db (test-specs)]
(create-test-table :fruit2 db)
(sql/db-do-prepared db ["INSERT INTO fruit2 ( name, appearance, cost, grade ) VALUES ( ?, ?, ?, ? )" ["test" "test" 1 1.0] ["two" "two" 2 2.0]] {:multi? true})
(is (= 2 (sql/query db ["SELECT * FROM fruit2"] {:result-set-fn count})))))
``` | 2017-11-24T03:31:00.000003 | Tari |
clojurians | clojure | on <https://searchcode.com/file/138699/src/test/clojure/clojure/java/test_jdbc.clj> | 2017-11-24T03:31:09.000160 | Tari |
clojurians | clojure | maybe you're looking for `execute!`? | 2017-11-24T03:31:10.000404 | Fe |
clojurians | clojure | I've tried that seems not working. | 2017-11-24T03:31:31.000261 | Tari |
clojurians | clojure | `SQLException Can not issue executeUpdate() or executeLargeUpdate() for SELECTs com.mysql.jdbc.SQLError.createSQLException (SQLError.java:957)` if I change to `execute!` | 2017-11-24T03:31:58.000039 | Tari |
clojurians | clojure | btw, can I do an `insert` stmt in a `then` subclause? | 2017-11-24T03:32:52.000278 | Tari |
clojurians | clojure | ah you need `query` | 2017-11-24T03:33:34.000145 | Fe |
clojurians | clojure | `execute!` is only for "write"-y queries (INSERT, UPDATE, etc.) | 2017-11-24T03:34:29.000051 | Fe |
clojurians | clojure | I am just trying to select something from the table, and if found, check the value of some column ( and if satisfied some condition do update, otherwise nothing ), if not ,do insert. And return a value that tells me what has been done. | 2017-11-24T03:34:29.000102 | Tari |
clojurians | clojure | yes, but can I do an `insert` in a `then` subclause when using `query`? | 2017-11-24T03:35:14.000240 | Tari |
clojurians | clojure | you're shifting the goalposts | 2017-11-24T03:35:25.000042 | Fe |
clojurians | clojure | better to ask one thing at a time, not "everything I've always wanted to know about SQL" | 2017-11-24T03:36:08.000139 | Fe |
clojurians | clojure | :smile: | 2017-11-24T03:36:30.000357 | Tari |
clojurians | clojure | sorry for that. | 2017-11-24T03:36:47.000126 | Tari |
clojurians | clojure | `query` works! | 2017-11-24T03:37:12.000006 | Tari |
clojurians | clojure | you can't nest INSERT inside of a compound statement - you'll need to do multiple queries, or use a stored procedure I think | 2017-11-24T03:37:51.000084 | Fe |
clojurians | clojure | Thanks. | 2017-11-24T03:38:33.000223 | Tari |
clojurians | clojure | I tried to write a stored procedure but `ERROR 1548 (HY000): Cannot load from mysql.proc. The table is probably corrupted` happens. But it is not right to ask this here. It seems the mysql version is too old. some `5.1` version. | 2017-11-24T03:39:44.000241 | Tari |
clojurians | clojure | Is it possible to utilize java annotations from clojure? | 2017-11-24T03:48:48.000218 | Jodie |
clojurians | clojure | <@Jodie> maybe this? <https://github.com/clojurebook/ClojureProgramming/tree/master/ch09-annotations> | 2017-11-24T04:10:09.000143 | Tari |
clojurians | clojure | <@Tari> perfect. Thanks. Completely missed that. | 2017-11-24T04:11:43.000364 | Jodie |
clojurians | clojure | I want to use `migratus` in my dev environment.
I also use `environ` to manage environments variables.
How can I set a value in my `project.clj` by evaluating data from `environ`?
working example:
```clojure
:migratus {:store :database
:migration-dir "migrations"
:db "<postgresql://postgres:pass@localhost/xchange>"}
```
What I want:
```clojure
``` | 2017-11-24T05:56:52.000216 | Mina |
clojurians | clojure | ```
:migratus {:store :database
:migration-dir "migrations"
:db ~(environ.core/env :db-url)}
``` | 2017-11-24T05:57:24.000108 | Mina |
clojurians | clojure | <@Mina> `:migratus {:store :database :db ~(get (System/getenv) "DATABASE_URL")}` | 2017-11-24T06:17:55.000212 | Verna |
clojurians | clojure | <@Mina> the rule is simple: once lein sees a list form, it tries to evaluate it. | 2017-11-24T06:18:31.000280 | Verna |
clojurians | clojure | But using `environ`, my `DB_URL` is not in the `System/getenv` map | 2017-11-24T06:19:25.000338 | Mina |
clojurians | clojure | Can `(let [...] (defn ...))` be problematic?
(generally I'd never do that, but from time to time I need some dynamism e.g. defns emitted from macros) | 2017-11-24T06:39:18.000026 | Kristy |
clojurians | clojure | Not that I know of; `(def fname (let [,,,] (fn ,,,)))` may be more conventional | 2017-11-24T12:56:58.000044 | Danyel |
clojurians | clojure | Thanks for the input! Might end up using that one | 2017-11-24T13:01:10.000046 | Kristy |
clojurians | clojure | I’m using stuartsierra component and can’t figure out how to fix this error anyhow. any hints would be much appreciated:
```
IllegalArgumentException No implementation of method: :stop of protocol: #'com.stuartsierra.component/Lifecycle found for class: nil clojure.core/-cache-protocol-fn (core_deftype.clj:568)
```
this is my application:
```
(ns application.system
(:require [application.web :refer [app]]
[com.stuartsierra.component :as component]
[org.httpkit.server :refer [run-server]]))
(defn- start-server [handler port]
(run-server app {:port port})
(println "Started server on localhost" port))
(defn- stop-server [server]
(when server
(server)))
(defrecord Application []
component/Lifecycle
(start [this]
(assoc this :server (start-server #'app 9009)))
(stop [this]
(stop-server (:server this))
(dissoc this :server)))
(defn create-system []
(Application.))
(defn -main [& args]
(.start (create-system)))
``` | 2017-11-24T15:20:00.000225 | Tameka |
clojurians | clojure | <@Tameka> that error means one of your components returns nil instead of a valid component | 2017-11-24T15:21:31.000088 | Margaret |
clojurians | clojure | (probably from a start method) | 2017-11-24T15:21:48.000079 | Margaret |
clojurians | clojure | but it relates to this Application component right? | 2017-11-24T15:22:27.000072 | Tameka |
clojurians | clojure | how would I know? | 2017-11-24T15:22:49.000001 | Margaret |
clojurians | clojure | one of your components, when started, returns nil instead of a component | 2017-11-24T15:23:00.000008 | Margaret |
clojurians | clojure | that's what causes that error | 2017-11-24T15:23:06.000010 | Margaret |
clojurians | clojure | unless you call stop on the wrong object and it was not your component in the first place | 2017-11-24T15:23:17.000238 | Margaret |
clojurians | clojure | :smile: well this is my whole application, so .. it has to be here | 2017-11-24T15:24:19.000036 | Tameka |
clojurians | clojure | somewhere | 2017-11-24T15:24:20.000131 | Tameka |
clojurians | clojure | OK - nothing in that code is calling the stop method | 2017-11-24T15:25:08.000026 | Margaret |
clojurians | clojure | who calls the stop method? | 2017-11-24T15:25:12.000100 | Margaret |
clojurians | clojure | I don't know component at all, but should 'start-server' return anything? It's returning nil at the moment. | 2017-11-24T15:25:21.000037 | Bibi |
clojurians | clojure | <@Bibi> that's the error, good eye | 2017-11-24T15:25:46.000092 | Margaret |
clojurians | clojure | <@Tameka> - println returns nil, so start-server returns nil | 2017-11-24T15:26:23.000052 | Margaret |
clojurians | clojure | ah damn it should be the other way round | 2017-11-24T15:26:49.000139 | Tameka |
clojurians | clojure | we still don't know what is calling stop, but that's what is causing the error | 2017-11-24T15:26:53.000034 | Margaret |
clojurians | clojure | yeah that was the issue. I had to have them other way round | 2017-11-24T15:31:14.000110 | Tameka |
clojurians | clojure | now the server instance is returned and life is good | 2017-11-24T15:31:24.000007 | Tameka |
clojurians | clojure | … again | 2017-11-24T15:31:29.000044 | Tameka |
clojurians | clojure | Do you know about the system library? | 2017-11-24T15:34:56.000119 | Bertram |
clojurians | clojure | <https://github.com/danielsz/system> | 2017-11-24T15:35:15.000130 | Bertram |
clojurians | clojure | It looks like it could be helpful based on your recent questions in the channel. | 2017-11-24T15:35:53.000044 | Bertram |
clojurians | clojure | Also lots of examples in the repo | 2017-11-24T15:36:13.000060 | Bertram |
clojurians | clojure | is there a clojure builtin for "take this vec of 5 elements, pad it to a list of 10 elemes by adding :null" 's ? | 2017-11-24T17:34:55.000105 | Berry |
clojurians | clojure | basically, "make this vec longer by repeating this elem" | 2017-11-24T17:35:08.000105 | Berry |
clojurians | clojure | no builtin, I'd use concat and repeat (concat coll (repeat 5 nil)) or (take 10 (concat coll (repeat nil))) | 2017-11-24T17:39:55.000123 | Margaret |
clojurians | clojure | `(first (partition 10 10 (repeat :b) [:a]))` | 2017-11-24T17:40:01.000113 | Willow |
clojurians | clojure | you could partition with a pad and take the first partition | 2017-11-24T17:40:08.000058 | Willow |
clojurians | clojure | although i think the take concat version is nicer | 2017-11-24T17:40:26.000089 | Willow |
clojurians | clojure | For those who use Docker, any reason to use java image instead of clojure image ? | 2017-11-24T19:29:49.000031 | Bebe |
clojurians | clojure | I've found making an uberjar (either on my machine or a build server) and then deploying as if it was java keeps things simple | 2017-11-24T19:32:52.000088 | Margaret |
clojurians | clojure | I was thinking of a workflow including ansible & docker. Maybe it's better to just stick to ansible | 2017-11-24T19:38:38.000091 | Bebe |
clojurians | clojure | Is docker more popular right now for production Clojure apps? | 2017-11-24T19:41:11.000027 | Giovanni |
clojurians | clojure | I saw some snippets to build & deploy with docker, but it seems a bit old and use java image instead of clojure one | 2017-11-24T19:46:48.000016 | Bebe |
clojurians | clojure | I'm about to deploy for the first time, what is the "safe" bet? | 2017-11-24T19:48:46.000089 | Giovanni |
clojurians | clojure | the simplest thing is to make an uberjar, make sure there's a jvm on your server, and run it | 2017-11-24T19:49:29.000024 | Margaret |
clojurians | clojure | I was thinking that docker container networking might be a better fit for me because I want a local database connection. How do Clojarians typically handle that sort of situation? | 2017-11-24T19:56:08.000023 | Giovanni |
clojurians | clojure | I've used dedicated database servers, so can't offer anything on that | 2017-11-24T19:57:01.000032 | Margaret |
clojurians | clojure | though with mongo, we do have a mongo server process for sharded dbs, that's set up by chef in our case | 2017-11-24T19:57:44.000002 | Margaret |
clojurians | clojure | (I think using ansible would be very similar) | 2017-11-24T19:58:15.000031 | Margaret |
clojurians | clojure | <@Giovanni> <https://www.reddit.com/r/java/comments/46ksv2/why_bother_with_docker_deployments_when_jars_are/> | 2017-11-24T20:31:49.000018 | Bebe |
clojurians | clojure | Ah and I found this: <http://www.capsule.io/> | 2017-11-24T20:32:34.000033 | Bebe |
clojurians | clojure | :slightly_smiling_face: | 2017-11-24T20:32:34.000078 | Bebe |
clojurians | clojure | This seems to confirm my suspicion that the benefits of solo UberJar is that simple deployment is easy, but doing anything non-trivial becomes a nightmare and the benefits of containers being that it can manage high amounts of deployment complexity, but is pretty heavy and frustrating to set up. Thanks for the resources, I'll have to ponder more what fits for my use case | 2017-11-24T20:36:00.000057 | Giovanni |
clojurians | clojure | "nightmare" is not my experience | 2017-11-24T20:36:18.000072 | Margaret |
clojurians | clojure | That's good to hear! Does the box running your UberJar have other dependencies that lein doesn't support? | 2017-11-24T20:37:27.000086 | Giovanni |
clojurians | clojure | I know you mentioned mongo, but I imagine you can keep the config inside of your .clj | 2017-11-24T20:37:57.000072 | Giovanni |
clojurians | clojure | it has a few local deps that are set up by chef (I am not the one managing ops / chef stuff though) | 2017-11-24T20:38:03.000024 | Margaret |
clojurians | clojure | there's a mongo program that you need to run, it's not a client thing | 2017-11-24T20:38:19.000103 | Margaret |
clojurians | clojure | (for sharded dbs) | 2017-11-24T20:38:25.000063 | Margaret |
clojurians | clojure | basically it's a mongo server running on localhost that interacts with the sharded system, because the client can't use it directly | 2017-11-24T20:39:12.000081 | Margaret |
clojurians | clojure | I'll have to consider the UberJar setup more seriously considering your positive experience. All of my professional dev is done on 'Nix boxes, and I'm a huge 'nix buff so I normally wouldn't shy away so much, but I have a few other portability considerations this time around. | 2017-11-24T20:40:54.000006 | Giovanni |
clojurians | clojure | yeah, even just the differences between OSX and Linux are a pain, and I see how a container helps there | 2017-11-24T20:41:29.000068 | Margaret |
clojurians | clojure | Two startups in a row we’ve deployed services in docker and never regretted it. “Pretty heavy” and “frustrating” have not been our experience. | 2017-11-24T20:41:45.000035 | Kyung |
clojurians | clojure | but an uberjar is an uberjar, and it really does work | 2017-11-24T20:41:48.000061 | Margaret |
clojurians | clojure | Thanks <@Kyung>, I haven't heard of many people regretting dockerizing. I didn't mean to use such bold words! :slightly_smiling_face: I'm just trying to view my options for their _upsides_ and their _downsides_. | 2017-11-24T20:44:51.000031 | Giovanni |
clojurians | clojure | I really don't think either option will cause too many problems. I'm thinking docker would give me a bit of the agility I'm after | 2017-11-24T20:46:46.000092 | Giovanni |
clojurians | clojure | Thanks much for the answers | 2017-11-24T20:47:24.000043 | Giovanni |
clojurians | clojure | <@Kyung> did you use java or clojure image ? just curious :slightly_smiling_face: | 2017-11-24T20:48:26.000012 | Bebe |
clojurians | clojure | Custom images. | 2017-11-24T21:03:06.000049 | Kyung |
clojurians | clojure | regardless of the solution you pick, I would like to advocate for having a separate build server or process, that isn't something run on your production server (eg. let circleci create your uberjar and upload it, and download it from your server process) | 2017-11-24T21:04:39.000076 | Margaret |
clojurians | clojure | In our case we built the docker images too, and we tagged (w/ version numbers) and uploaded those to a local docker image repository. | 2017-11-24T22:00:07.000023 | Kyung |
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