我正在尝试为Haskell项目安装HDBC和HDBC.odbc。我从Hackage下载了模块并需要依赖，并用cabal install [module name]安装了它们。
尽管由于我在Windows上，所以确实需要为convertible和utf8依赖项使用Cygwin。
当我打电话给cabal list --installed时，我得到
* Cabal
Synopsis: A framework for packaging Haskell software
Default available version: 3.0.0.0
Installed versions: 2.4.0.1
Homepage: http://www.haskell.org/cabal/
License: BSD3
* HDBC
Synopsis: Haskell Database Connectivity
Default available version: 2.4.0.3
Installed versions: 2.4.0.3
Homepage: https://github.com/hdbc/hdbc
License: BSD3
* HDBC-odbc
Synopsis: ODBC driver for HDBC
Default available version: 2.6.0.0
Installed versions: 2.6.0.0
Homepage: https://github.com/hdbc/hdbc-odbc
License: BSD3
* Win32
Synopsis: A binding to Windows Win32 API.
Default available version: 2.8.3.0
Installed versions: 2.6.1.0
Homepage: https://github.com/haskell/win32
License: BSD3
* array
Synopsis: Mutable and immutable arrays
Default available version: 0.5.4.0
Installed versions: 0.5.3.0
License: BSD3
* asn1-types
Synopsis: ASN.1 types
Default available version: 0.3.3
Installed versions: 0.3.3
Homepage: http://github.com/vincenthz/hs-asn1
License: BSD3
* async
Synopsis: Run IO operations asynchronously and wait for their results
Default available version: 2.2.2
Installed versions: 2.2.2
Homepage: https://github.com/simonmar/async
License: BSD3
* base
Synopsis: Basic libraries
Default available version: 4.12.0.0
Installed versions: 4.12.0.0
License: BSD-3-Clause
* basement
Synopsis: Foundation scrap box of array & string
Default available version: 0.0.11
Installed versions: 0.0.11
Homepage: https://github.com/haskell-foundation/foundation#readme
License: BSD3
* binary
Synopsis: Binary serialisation for Haskell values using lazy ByteStrings
Default available version: 0.8.7.0
Installed versions: 0.8.6.0
Homepage: https://github.com/kolmodin/binary
License: BSD3
* byteable
Synopsis: Type class for sequence of bytes
Default available version: 0.1.1
Installed versions: 0.1.1
Homepage: http://github.com/vincenthz/hs-byteable
License: BSD3
* bytestring
Synopsis: Fast, compact, strict and lazy byte strings with a list interface
Default available version: 0.10.10.0
Installed versions: 0.10.8.2
Homepage: https://github.com/haskell/bytestring
License: BSD3
* cereal
Synopsis: A binary serialization library
Default available version: 0.5.8.1
Installed versions: 0.5.8.1
Homepage: https://github.com/GaloisInc/cereal
License: BSD3
* concurrent-extra
Synopsis: Extra concurrency primitives
Default available version: 0.7.0.12
Installed versions: 0.7.0.12
Homepage: https://github.com/basvandijk/concurrent-extra
License: BSD3
* containers
Synopsis: Assorted concrete container types
Default available version: 0.6.2.1
Installed versions: 0.6.0.1
License: BSD3
* convertible
Synopsis: Typeclasses and instances for converting between types
Default available version: 1.1.1.0
Installed versions: 1.1.0.0
Homepage: http://hackage.haskell.org/package/convertible
License: BSD3
* cryptonite
Synopsis: Cryptography Primitives sink
Default available version: 0.26
Installed versions: 0.26
Homepage: https://github.com/haskell-crypto/cryptonite
License: BSD3
* data-default-class
Synopsis: A class for types with a default value
Default available version: 0.1.2.0
Installed versions: 0.1.2.0
License: BSD3
* deepseq
Synopsis: Deep evaluation of data structures
Default available version: 1.4.4.0
Installed versions: 1.4.4.0
License: BSD3
* directory
Synopsis: Platform-agnostic library for filesystem operations
Default available version: 1.3.4.0
Installed versions: 1.3.3.0
License: BSD3
* filepath
Synopsis: Library for manipulating FilePaths in a cross platform way.
Default available version: 1.4.2.1
Installed versions: 1.4.2.1
Homepage: https://github.com/haskell/filepath#readme
License: BSD3
* ghc
Synopsis: The GHC API
Default available version: 8.6.5
Installed versions: 8.6.5
Homepage: http://www.haskell.org/ghc/
License: BSD3
* ghc-boot
Synopsis: Shared functionality between GHC and its boot libraries
Default available version: 8.8.1
Installed versions: 8.6.5
License: BSD3
* ghc-boot-th
Synopsis: Shared functionality between GHC and the `template-haskell`
library
Default available version: 8.8.1
Installed versions: 8.6.5
License: BSD3
* ghc-compact
Synopsis: In memory storage of deeply evaluated data structure
Default available version: 0.1.0.0
Installed versions: 0.1.0.0
License: BSD3
* ghc-heap
Default available version: [ Not available from any configured repository ]
Installed versions: 8.6.5
License: BSD-3-Clause
* ghc-prim
Synopsis: GHC primitives
Default available version: 0.5.3
Installed versions: 0.5.3
License: BSD-3-Clause
* ghci
Synopsis: The library supporting GHC's interactive interpreter
Default available version: 8.6.5
Installed versions: 8.6.5
License: BSD3
* hashable
Synopsis: A class for types that can be converted to a hash value
Default available version: 1.3.0.0
Installed versions: 1.3.0.0
Homepage: http://github.com/tibbe/hashable
License: BSD3
* haskeline
Synopsis: A command-line interface for user input, written in Haskell.
Default available version: 0.7.5.0
Installed versions: 0.7.4.3
Homepage: https://github.com/judah/haskeline
License: BSD3
* hostname
Synopsis: A very simple package providing a cross-platform means of
determining the hostname
Default available version: 1.0
Installed versions: 1.0
License: BSD3
* hourglass
Synopsis: simple performant time related library
Default available version: 0.2.12
Installed versions: 0.2.12
Homepage: https://github.com/vincenthz/hs-hourglass
License: BSD3
* hpc
Synopsis: Code Coverage Library for Haskell
Default available version: 0.6.0.3
Installed versions: 0.6.0.3
License: BSD3
* hscolour
Synopsis: Colourise Haskell code.
Default available version: 1.24.4
Installed versions: 1.24.4
Homepage: http://code.haskell.org/~malcolm/hscolour/
License: LGPL
* integer-gmp
Synopsis: Integer library based on GMP
Default available version: 1.0.2.0
Installed versions: 1.0.2.0
License: BSD3
* libiserv
Default available version: [ Not available from any configured repository ]
Installed versions: 8.6.3
License: BSD-3-Clause
* memory
Synopsis: memory and related abstraction stuff
Default available version: 0.15.0
Installed versions: 0.15.0
Homepage: https://github.com/vincenthz/hs-memory
License: BSD3
* mtl
Synopsis: Monad classes, using functional dependencies
Default available version: 2.2.2
Installed versions: 2.2.2
Homepage: http://github.com/haskell/mtl
License: BSD3
* old-locale
Synopsis: locale library
Default available version: 1.0.0.7
Installed versions: 1.0.0.7
License: BSD3
* old-time
Synopsis: Time library
Default available version: 1.1.0.3
Installed versions: 1.1.0.3
License: BSD3
* parsec
Synopsis: Monadic parser combinators
Default available version: 3.1.14.0
Installed versions: 3.1.13.0
Homepage: https://github.com/haskell/parsec
License: BSD3
* pem
Synopsis: Privacy Enhanced Mail (PEM) format reader and writer.
Default available version: 0.2.4
Installed versions: 0.2.4
Homepage: http://github.com/vincenthz/hs-pem
License: BSD3
* pretty
Synopsis: Pretty-printing library
Default available version: 1.1.3.6
Installed versions: 1.1.3.6
Homepage: http://github.com/haskell/pretty
License: BSD3
* primitive
Synopsis: Primitive memory-related operations
Default available version: 0.7.0.0
Installed versions: 0.7.0.0
Homepage: https://github.com/haskell/primitive
License: BSD-3-Clause
* process
Synopsis: Process libraries
Default available version: 1.6.6.0
Installed versions: 1.6.5.0
License: BSD3
* random
Synopsis: random number library
Default available version: 1.1
Installed versions: 1.1
License: BSD3
* rts
Default available version: [ Not available from any configured repository ]
Installed versions: 1.0
License: BSD-3-Clause
* securemem
Synopsis: abstraction to an auto scrubbing and const time eq, memory chunk.
Default available version: 0.1.10
Installed versions: 0.1.10
Homepage: https://github.com/vincenthz/hs-securemem
License: BSD3
* stm
Synopsis: Software Transactional Memory
Default available version: 2.5.0.0
Installed versions: 2.5.0.0
Homepage: https://wiki.haskell.org/Software_transactional_memory
License: BSD3
* template-haskell
Synopsis: Support library for Template Haskell
Default available version: 2.15.0.0
Installed versions: 2.14.0.0
License: BSD3
* text
Synopsis: An efficient packed Unicode text type.
Default available version: 1.2.4.0
Installed versions: 1.2.3.1
Homepage: https://github.com/haskell/text
License: BSD2
* time
Synopsis: A time library
Default available version: 1.9.3
Installed versions: 1.8.0.2
Homepage: https://github.com/haskell/time
License: BSD3
* transformers
Synopsis: Concrete functor and monad transformers
Default available version: 0.5.6.2
Installed versions: 0.5.6.2
License: BSD3
* unbounded-delays
Synopsis: Unbounded thread delays and timeouts
Default available version: 0.1.1.0
Installed versions: 0.1.1.0
Homepage: https://github.com/basvandijk/unbounded-delays
License: BSD3
* utf8-string
Synopsis: Support for reading and writing UTF8 Strings
Default available version: 1.0.1.1
Installed versions: 1.0.1.1
Homepage: http://github.com/glguy/utf8-string/
License: BSD3
* uuid-types
Synopsis: Type definitions for Universally Unique Identifiers
Default available version: 1.0.3
Installed versions: 1.0.3
Homepage: https://github.com/aslatter/uuid
License: BSD3
* vector
Synopsis: Efficient Arrays
Default available version: 0.12.0.3
Installed versions: 0.12.0.3
Homepage: https://github.com/haskell/vector
License: BSD3
* xhtml
Synopsis: An XHTML combinator library
Default available version: 3000.2.2.1
Installed versions: 3000.2.2.1
Homepage: https://github.com/haskell/xhtml
License: BSD3
项目的.cabal库和可执行文件如下
library
exposed-modules: HDBC,
HDBC-odbc
-- other-modules:
-- other-extensions:
build-depends: base >=4.12 && <4.13
hs-source-dirs: src
default-language: Haskell2010
executable collatz
main-is: Main.hs
-- other-modules:
-- other-extensions:
build-depends: base >=4.12 && <4.13
hs-source-dirs: src
default-language: Haskell2010
但是在项目中仍然无法识别模块。
module Main where
import Database.HDBC
import Database.HDBC.ODBC
main :: IO ()
main = do
Could not find module `Database.HDBC'
Could not find module `Database.HDBC.ODBC'
我将模块放在单独的目录中，但是我尝试将它们直接放入同一目录中也没有成功，因此我不确定是否有必要。.
我还很陌生，这是我第一次处理这样的导入模块。我进行了大量的搜索，但没有找到成功的指南，也没有发现与我类似的问题。
如果出于某种原因有帮助，我正在Windows 10的VSCode上使用Haskero。