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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... | 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-se... | 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 "<post... | 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)
```
th... | 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 resource... | 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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