Kotlin generated code review #6
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| const val deleteAuthor = """-- name: deleteAuthor :exec | ||
| DELETE FROM authors | ||
| WHERE id = ? | ||
| """ |
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use trimIndent or trimMargin so you can indent?
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I could, but why bother? This seems like a minor style nit
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| @Throws(SQLException::class) | ||
| fun createAuthor(arg: CreateAuthorParams): Author { | ||
| val stmt = conn.prepareStatement(createAuthor) |
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use use when working with auto closeables.
conn.prepareStatement(createAuthor).use { stmt ->
stmt.setString(..)
}
| throw SQLException("no rows in result set") | ||
| } | ||
| val ret = Author( | ||
| results.getLong(1), |
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you can select by field name, which is slightly nicer and less brittle.
results.getLong("id")
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The generator will ensure the columns match. This won't be brittle.
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I think there is also a slight performance cost with named columns but I might be wrong.
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What does sqlc do if you use * in your SELECT?
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The sqlc parser expands the * to the actual columns in your schema and rewrites your query.
| val stmt = conn.prepareStatement(getAuthor) | ||
| stmt.setLong(1, id) | ||
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| return stmt.executeQuery().use { results -> |
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well sometimes you are using use :P be consistent, always use it
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ah yeah, I didn't realize that closing the statement also closes the ResultSet when I first wrote this. This is better
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| class QueriesImpl(private val conn: Connection) { | ||
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| @Throws(SQLException::class) |
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what does this do? force java code to catch SQLException?
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Yeah, basically all JDBC functions throw SQLException, so I figured it's nice to annotate it, and for it to be checked in Java
| stmt.setInt(1, bookId) | ||
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| return stmt.executeQuery().use { results -> | ||
| if (!results.next()) { |
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I see this pattern a lot. could probably add some kind of extension to ResultSet
fun ResultSet.uniqueResultNext() {
if (!results.next()) {
throws SQLException("no results");
}
if (results.next()) {
throw SQLException("too many");
}
results.previous()
}
jdbc is gross
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Agree, but I want to defer needing a library to use this code.
| ?, | ||
| ?, | ||
| ? | ||
| ) RETURNING id |
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| package com.example.booktest.postgresql | ||
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| import java.time.OffsetDateTime |
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Wow I didn't actually know about this new DateTime class. I think we tend to use LocalDate and Instant but that's probably because we predate Java 8 and we always store timestamps with UTC. This does look like a good fit as a general timezoned datetime instance.
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I didn't either lol. The postgres jdbc driver explicitly doesn't support Instant
| (results.getArray(8).array as Array<String>).toList() | ||
| )) | ||
| } | ||
| ret |
| tags | ||
| FROM books | ||
| LEFT JOIN authors ON books.author_id = authors.author_id | ||
| WHERE tags && ?::varchar[] |
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LGTM |
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This has been merged upstream. |
3 participants
This PR is massive, but it provides a place to leave comments to code review the generated code.
If you want to actually look through the code and try it, start here https://github.com/mightyguava/sqlc/tree/kotlin-master/examples/kotlin