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https://issues.apache.org/jira/browse/CSV-251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16924138#comment-16924138
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Melloware commented on CSV-251:
-------------------------------
+1 for just adding Commons Codec dependency.
> CSVPrinter don't handle byte[] correctly for postgres
> -----------------------------------------------------
>
> Key: CSV-251
> URL: https://issues.apache.org/jira/browse/CSV-251
> Project: Commons CSV
> Issue Type: Improvement
> Components: Printer
> Environment: java version
> ```
> openjdk version "1.8.0_222"
> OpenJDK Runtime Environment (build 1.8.0_222-8u222-b10-1ubuntu1~18.04.1-b10)
> OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode)
> ```
> apache.commons.csv: 1.6
> clojure: 1.9.0
> postgres: 10.7
>
> Reporter: saitouena
> Priority: Minor
>
> I passed byte[] values for CSVPrinter.printRecords with
> CSVFormat.POSTGRESQL_CSV, but it use Object.toString(printed [B@xxxx in
> clojure). As a result, data were discarded.
> I don't know about other RDBs, but at least postgres supports
> [https://www.postgresql.org/docs/9.3/datatype-binary.html] hexstring format.
> Workaround: Wrap byte[] with the class that has proper toString method like
> this.
> ```
> public string toString()
> { return "\\x" + encodeHexString(this.bytedata); }
> ```
> I used apache.commons.csv from Clojure. I'll make a minimal repro case in
> Java if needed. I have clojure code for now.
> clojure code:
> ```
> (deftype ByteArrayForCopyIn [^"[B" bs]
> Object
> (toString [self] (str "\\x" (Hex/encodeHexString bs))))
> (let [sb (StringBuilder.)
> values [(.getBytes "hoge")]]
> (with-open [^CSVPrinter p (CSVPrinter. sb CSVFormat/POSTGRESQL_CSV)]
> (.printRecords p values)))
> ```
>
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