[Julia]Postgresql接続確認

## はじめに

　データ分析や機械学習などに利用できるプログラムとして、Juliaがあると知った。
　以下３点のメリットから今後利用することがあるかもしれないので、備忘録として初歩的なことから欲しかった資料をまとめていく。
　[1]Pythonと同じようにライブラリを利用できる
　[2]実行速度がC言語よりも速い
　[3]PythonやC言語と連携することもできる

## 実行環境
　参考資料[1]で構築したVSCにおけるWSL2で実行している。
　また、PostgreSQL環境構築は参考資料[2]で実施した内容となる。

## Package情報
　参考資料[3]を参考に以下コマンドで必要なパッケージをインストールできるが、バージョン違いによって動作不調を起こす可能性があるため、Package情報も記載する。

```
using Pkg
Pkg.add("LibPQ")
```

<details>
<summary>Mainfest.toml（クリックで展開）</summary>

~~~Mainfest.toml
# This file is machine-generated - editing it directly is not advised

julia_version = "1.11.4"
manifest_format = "2.0"
project_hash = "1cd9b8443a2ec02008188ea74d3e55a8c3fa6b42"

[[deps.ArgTools]]
uuid = "0dad84c5-d112-42e6-8d28-ef12dabb789f"
version = "1.1.2"

[[deps.Artifacts]]
uuid = "56f22d72-fd6d-98f1-02f0-08ddc0907c33"
version = "1.11.0"

[[deps.Base64]]
uuid = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
version = "1.11.0"

[[deps.CEnum]]
git-tree-sha1 = "389ad5c84de1ae7cf0e28e381131c98ea87d54fc"
uuid = "fa961155-64e5-5f13-b03f-caf6b980ea82"
version = "0.5.0"

[[deps.Compat]]
deps = ["TOML", "UUIDs"]
git-tree-sha1 = "8ae8d32e09f0dcf42a36b90d4e17f5dd2e4c4215"
uuid = "34da2185-b29b-5c13-b0c7-acf172513d20"
version = "4.16.0"

    [deps.Compat.extensions]
    CompatLinearAlgebraExt = "LinearAlgebra"

    [deps.Compat.weakdeps]
    Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
    LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"

[[deps.DBInterface]]
git-tree-sha1 = "a444404b3f94deaa43ca2a58e18153a82695282b"
uuid = "a10d1c49-ce27-4219-8d33-6db1a4562965"
version = "2.6.1"

[[deps.DataAPI]]
git-tree-sha1 = "abe83f3a2f1b857aac70ef8b269080af17764bbe"
uuid = "9a962f9c-6df0-11e9-0e5d-c546b8b5ee8a"
version = "1.16.0"

[[deps.DataValueInterfaces]]
git-tree-sha1 = "bfc1187b79289637fa0ef6d4436ebdfe6905cbd6"
uuid = "e2d170a0-9d28-54be-80f0-106bbe20a464"
version = "1.0.0"

[[deps.Dates]]
deps = ["Printf"]
uuid = "ade2ca70-3891-5945-98fb-dc099432e06a"
version = "1.11.0"

[[deps.Decimals]]
git-tree-sha1 = "e98abef36d02a0ec385d68cd7dadbce9b28cbd88"
uuid = "abce61dc-4473-55a0-ba07-351d65e31d42"
version = "0.4.1"

[[deps.Distributed]]
deps = ["Random", "Serialization", "Sockets"]
uuid = "8ba89e20-285c-5b6f-9357-94700520ee1b"
version = "1.11.0"

[[deps.DocStringExtensions]]
git-tree-sha1 = "e7b7e6f178525d17c720ab9c081e4ef04429f860"
uuid = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
version = "0.9.4"

[[deps.Downloads]]
deps = ["ArgTools", "FileWatching", "LibCURL", "NetworkOptions"]
uuid = "f43a241f-c20a-4ad4-852c-f6b1247861c6"
version = "1.6.0"

[[deps.ExprTools]]
git-tree-sha1 = "27415f162e6028e81c72b82ef756bf321213b6ec"
uuid = "e2ba6199-217a-4e67-a87a-7c52f15ade04"
version = "0.1.10"

[[deps.FileWatching]]
uuid = "7b1f6079-737a-58dc-b8bc-7a2ca5c1b5ee"
version = "1.11.0"

[[deps.ICU_jll]]
deps = ["Artifacts", "JLLWrappers", "Libdl"]
git-tree-sha1 = "b3d8be712fbf9237935bde0ce9b5a736ae38fc34"
uuid = "a51ab1cf-af8e-5615-a023-bc2c838bba6b"
version = "76.2.0+0"

[[deps.Infinity]]
deps = ["Dates", "Random", "Requires"]
git-tree-sha1 = "cf8234411cbeb98676c173f930951ea29dca3b23"
uuid = "a303e19e-6eb4-11e9-3b09-cd9505f79100"
version = "0.2.4"

[[deps.InlineStrings]]
git-tree-sha1 = "6a9fde685a7ac1eb3495f8e812c5a7c3711c2d5e"
uuid = "842dd82b-1e85-43dc-bf29-5d0ee9dffc48"
version = "1.4.3"

    [deps.InlineStrings.extensions]
    ArrowTypesExt = "ArrowTypes"
    ParsersExt = "Parsers"

    [deps.InlineStrings.weakdeps]
    ArrowTypes = "31f734f8-188a-4ce0-8406-c8a06bd891cd"
    Parsers = "69de0a69-1ddd-5017-9359-2bf0b02dc9f0"

[[deps.InteractiveUtils]]
deps = ["Markdown"]
uuid = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
version = "1.11.0"

[[deps.Intervals]]
deps = ["Dates", "Printf", "RecipesBase", "Serialization", "TimeZones"]
git-tree-sha1 = "ac0aaa807ed5eaf13f67afe188ebc07e828ff640"
uuid = "d8418881-c3e1-53bb-8760-2df7ec849ed5"
version = "1.10.0"

[[deps.IterTools]]
git-tree-sha1 = "42d5f897009e7ff2cf88db414a389e5ed1bdd023"
uuid = "c8e1da08-722c-5040-9ed9-7db0dc04731e"
version = "1.10.0"

[[deps.IteratorInterfaceExtensions]]
git-tree-sha1 = "a3f24677c21f5bbe9d2a714f95dcd58337fb2856"
uuid = "82899510-4779-5014-852e-03e436cf321d"
version = "1.0.0"

[[deps.JLLWrappers]]
deps = ["Artifacts", "Preferences"]
git-tree-sha1 = "a007feb38b422fbdab534406aeca1b86823cb4d6"
uuid = "692b3bcd-3c85-4b1f-b108-f13ce0eb3210"
version = "1.7.0"

[[deps.Kerberos_krb5_jll]]
deps = ["Artifacts", "JLLWrappers", "Libdl"]
git-tree-sha1 = "0f2899fdadaab4b8f57db558ba21bdb4fb52f1f0"
uuid = "b39eb1a6-c29a-53d7-8c32-632cd16f18da"
version = "1.21.3+0"

[[deps.LayerDicts]]
git-tree-sha1 = "6087ad3521d6278ebe5c27ae55e7bbb15ca312cb"
uuid = "6f188dcb-512c-564b-bc01-e0f76e72f166"
version = "1.0.0"

[[deps.LibCURL]]
deps = ["LibCURL_jll", "MozillaCACerts_jll"]
uuid = "b27032c2-a3e7-50c8-80cd-2d36dbcbfd21"
version = "0.6.4"

[[deps.LibCURL_jll]]
deps = ["Artifacts", "LibSSH2_jll", "Libdl", "MbedTLS_jll", "Zlib_jll", "nghttp2_jll"]
uuid = "deac9b47-8bc7-5906-a0fe-35ac56dc84c0"
version = "8.6.0+0"

[[deps.LibPQ]]
deps = ["CEnum", "DBInterface", "Dates", "Decimals", "DocStringExtensions", "FileWatching", "Infinity", "Intervals", "IterTools", "LayerDicts", "LibPQ_jll", "Libdl", "Memento", "OffsetArrays", "SQLStrings", "Tables", "TimeZones", "UTCDateTimes"]
git-tree-sha1 = "3d227cd13cbf1e9a54d7748dab33e078da6f9168"
uuid = "194296ae-ab2e-5f79-8cd4-7183a0a5a0d1"
version = "1.18.0"

[[deps.LibPQ_jll]]
deps = ["Artifacts", "ICU_jll", "JLLWrappers", "Kerberos_krb5_jll", "Libdl", "OpenSSL_jll", "Zstd_jll"]
git-tree-sha1 = "7757f54f007cc0eb516a5000fb9a6fc19a49da7e"
uuid = "08be9ffa-1c94-5ee5-a977-46a84ec9b350"
version = "16.8.0+0"

[[deps.LibSSH2_jll]]
deps = ["Artifacts", "Libdl", "MbedTLS_jll"]
uuid = "29816b5a-b9ab-546f-933c-edad1886dfa8"
version = "1.11.0+1"

[[deps.Libdl]]
uuid = "8f399da3-3557-5675-b5ff-fb832c97cbdb"
version = "1.11.0"

[[deps.Logging]]
uuid = "56ddb016-857b-54e1-b83d-db4d58db5568"
version = "1.11.0"

[[deps.Markdown]]
deps = ["Base64"]
uuid = "d6f4376e-aef5-505a-96c1-9c027394607a"
version = "1.11.0"

[[deps.MbedTLS_jll]]
deps = ["Artifacts", "Libdl"]
uuid = "c8ffd9c3-330d-5841-b78e-0817d7145fa1"
version = "2.28.6+0"

[[deps.Memento]]
deps = ["Dates", "Distributed", "Requires", "Serialization", "Sockets", "Test", "UUIDs"]
git-tree-sha1 = "bb2e8f4d9f400f6e90d57b34860f6abdc51398e5"
uuid = "f28f55f0-a522-5efc-85c2-fe41dfb9b2d9"
version = "1.4.1"

[[deps.Mocking]]
deps = ["Compat", "ExprTools"]
git-tree-sha1 = "2c140d60d7cb82badf06d8783800d0bcd1a7daa2"
uuid = "78c3b35d-d492-501b-9361-3d52fe80e533"
version = "0.8.1"

[[deps.MozillaCACerts_jll]]
uuid = "14a3606d-f60d-562e-9121-12d972cd8159"
version = "2023.12.12"

[[deps.NetworkOptions]]
uuid = "ca575930-c2e3-43a9-ace4-1e988b2c1908"
version = "1.2.0"

[[deps.OffsetArrays]]
git-tree-sha1 = "117432e406b5c023f665fa73dc26e79ec3630151"
uuid = "6fe1bfb0-de20-5000-8ca7-80f57d26f881"
version = "1.17.0"

    [deps.OffsetArrays.extensions]
    OffsetArraysAdaptExt = "Adapt"

    [deps.OffsetArrays.weakdeps]
    Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"

[[deps.OpenSSL_jll]]
deps = ["Artifacts", "JLLWrappers", "Libdl"]
git-tree-sha1 = "a9697f1d06cc3eb3fb3ad49cc67f2cfabaac31ea"
uuid = "458c3c95-2e84-50aa-8efc-19380b2a3a95"
version = "3.0.16+0"

[[deps.OrderedCollections]]
git-tree-sha1 = "cc4054e898b852042d7b503313f7ad03de99c3dd"
uuid = "bac558e1-5e72-5ebc-8fee-abe8a469f55d"
version = "1.8.0"

[[deps.PrecompileTools]]
deps = ["Preferences"]
git-tree-sha1 = "5aa36f7049a63a1528fe8f7c3f2113413ffd4e1f"
uuid = "aea7be01-6a6a-4083-8856-8a6e6704d82a"
version = "1.2.1"

[[deps.Preferences]]
deps = ["TOML"]
git-tree-sha1 = "9306f6085165d270f7e3db02af26a400d580f5c6"
uuid = "21216c6a-2e73-6563-6e65-726566657250"
version = "1.4.3"

[[deps.Printf]]
deps = ["Unicode"]
uuid = "de0858da-6303-5e67-8744-51eddeeeb8d7"
version = "1.11.0"

[[deps.Random]]
deps = ["SHA"]
uuid = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
version = "1.11.0"

[[deps.RecipesBase]]
deps = ["PrecompileTools"]
git-tree-sha1 = "5c3d09cc4f31f5fc6af001c250bf1278733100ff"
uuid = "3cdcf5f2-1ef4-517c-9805-6587b60abb01"
version = "1.3.4"

[[deps.Requires]]
deps = ["UUIDs"]
git-tree-sha1 = "62389eeff14780bfe55195b7204c0d8738436d64"
uuid = "ae029012-a4dd-5104-9daa-d747884805df"
version = "1.3.1"

[[deps.SHA]]
uuid = "ea8e919c-243c-51af-8825-aaa63cd721ce"
version = "0.7.0"

[[deps.SQLStrings]]
git-tree-sha1 = "55de0530689832b1d3d43491ee6b67bd54d3323c"
uuid = "af517c2e-c243-48fa-aab8-efac3db270f5"
version = "0.1.0"

[[deps.Scratch]]
deps = ["Dates"]
git-tree-sha1 = "3bac05bc7e74a75fd9cba4295cde4045d9fe2386"
uuid = "6c6a2e73-6563-6170-7368-637461726353"
version = "1.2.1"

[[deps.Serialization]]
uuid = "9e88b42a-f829-5b0c-bbe9-9e923198166b"
version = "1.11.0"

[[deps.Sockets]]
uuid = "6462fe0b-24de-5631-8697-dd941f90decc"
version = "1.11.0"

[[deps.TOML]]
deps = ["Dates"]
uuid = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
version = "1.0.3"

[[deps.TZJData]]
deps = ["Artifacts"]
git-tree-sha1 = "72df96b3a595b7aab1e101eb07d2a435963a97e2"
uuid = "dc5dba14-91b3-4cab-a142-028a31da12f7"
version = "1.5.0+2025b"

[[deps.TableTraits]]
deps = ["IteratorInterfaceExtensions"]
git-tree-sha1 = "c06b2f539df1c6efa794486abfb6ed2022561a39"
uuid = "3783bdb8-4a98-5b6b-af9a-565f29a5fe9c"
version = "1.0.1"

[[deps.Tables]]
deps = ["DataAPI", "DataValueInterfaces", "IteratorInterfaceExtensions", "OrderedCollections", "TableTraits"]
git-tree-sha1 = "598cd7c1f68d1e205689b1c2fe65a9f85846f297"
uuid = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
version = "1.12.0"

[[deps.Test]]
deps = ["InteractiveUtils", "Logging", "Random", "Serialization"]
uuid = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
version = "1.11.0"

[[deps.TimeZones]]
deps = ["Artifacts", "Dates", "Downloads", "InlineStrings", "Mocking", "Printf", "Scratch", "TZJData", "Unicode", "p7zip_jll"]
git-tree-sha1 = "2c705e96825b66c4a3f25031a683c06518256dd3"
uuid = "f269a46b-ccf7-5d73-abea-4c690281aa53"
version = "1.21.3"
weakdeps = ["RecipesBase"]

    [deps.TimeZones.extensions]
    TimeZonesRecipesBaseExt = "RecipesBase"

[[deps.UTCDateTimes]]
deps = ["Dates", "TimeZones"]
git-tree-sha1 = "4af3552bf0cf4a071bf3d14bd20023ea70f31b62"
uuid = "0f7cfa37-7abf-4834-b969-a8aa512401c2"
version = "1.6.1"

[[deps.UUIDs]]
deps = ["Random", "SHA"]
uuid = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
version = "1.11.0"

[[deps.Unicode]]
uuid = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
version = "1.11.0"

[[deps.Zlib_jll]]
deps = ["Libdl"]
uuid = "83775a58-1f1d-513f-b197-d71354ab007a"
version = "1.2.13+1"

[[deps.Zstd_jll]]
deps = ["Artifacts", "JLLWrappers", "Libdl"]
git-tree-sha1 = "446b23e73536f84e8037f5dce465e92275f6a308"
uuid = "3161d3a3-bdf6-5164-811a-617609db77b4"
version = "1.5.7+1"

[[deps.nghttp2_jll]]
deps = ["Artifacts", "Libdl"]
uuid = "8e850ede-7688-5339-a07c-302acd2aaf8d"
version = "1.59.0+0"

[[deps.p7zip_jll]]
deps = ["Artifacts", "Libdl"]
uuid = "3f19e933-33d8-53b3-aaab-bd5110c3b7a0"
version = "17.4.0+2"
~~~

</details>

<details>
<summary>Project.toml（クリックで展開）</summary>

~~~Project.toml
[deps]
LibPQ = "194296ae-ab2e-5f79-8cd4-7183a0a5a0d1"

~~~

</details>

## 確認手順
### ①確認用プログラムを作成
``` test.jl
using LibPQ

conn = LibPQ.Connection("""
    host=localhost
    port=設定したホストポート番号
    dbname=設定したDB名
    user=設定したユーザ
    password=設定したパスワード
""")

result = execute(conn, "SELECT version();")
for row in result
    println(row[1])
end

close(conn)

```

### ②実行
```
include("test.jl")
```
 成功すると、以下の画像のようにPostgresqlのバージョンが表示される。

![image.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/1391358/6b97d7aa-9a02-47aa-b23b-eaca32a71552.png)



## 参考資料
[1]svoboda, 『[Julia]VSCにおけるWSL2でのJulia　環境構築～サンプルコード実行まで』, https://qiita.com/svoboda/items/6a0ad624bc58a354edb3
[2]svoboda, 『[PostgreSQL][Python]VSCにおけるWSL2でのPostgreSQL環境構築』, https://qiita.com/svoboda/items/0d4234aea9c9082705b6
[3]svoboda, 『[Julia]仮想環境（Package）構築』, https://qiita.com/svoboda/items/ad77b77913eb78ac0b41
[4]iamed2, 『JuliaDatabases/LibPQ.jl: A Julia wrapper for libpq』,https://github.com/JuliaDatabases/LibPQ.jl
[5]abhro, 『Home · LibPQ.jl』, https://juliadatabases.org/LibPQ.jl/dev/
[6]ekzemplaro(内田 雅智), 『ChatGPT: Julia で、PostgreSQL のテーブルを Dataframe に読み込む方法』,https://qiita.com/ekzemplaro/items/75b4c0f55a1fbc2885dc