在macOS High Sierra上使用DBD:：SQLite可产生吨的；重新定义的子例程"；警告

简单地说，当我在macOS High Sierra上使用DBD:：SQLite时，会出现大量虚假的“子例程…重定义”错误

如果我把这段代码放在iMac或MacBook Pro上运行（都运行10.13.3高）

它产生了以下结果：

Constant subroutine DBD::SQLite::NEWAPI redefined at /System/Library/Perl/5.18/constant.pm line 140.
Subroutine driver redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 31.
Subroutine CLONE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 73.
Subroutine connect redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 80.
Subroutine install_collation redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 160.
Subroutine regexp redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 178.
Subroutine prepare redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 186.
Subroutine do redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 200.
Subroutine ping redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 219.
Subroutine _get_version redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 230.
Subroutine get_info redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 240.
Subroutine _attached_database_list redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 247.
Subroutine table_info redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 262.
Subroutine primary_key_info redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 378.
Subroutine foreign_key_info redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 536.
Subroutine statistics_info redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 636.
Subroutine type_info_all redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 704.
Subroutine column_info redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 766.
Subroutine TIEHASH redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 885.
Subroutine STORE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 889.
Subroutine DELETE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 894.
Subroutine DBD::SQLite::db::sqlite_last_insert_rowid redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::last_insert_rowid redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_create_function redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::create_function redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_enable_load_extension redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::enable_load_extension redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::load_extension redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_load_extension redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::create_aggregate redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_create_aggregate redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_create_collation redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::create_collation redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::collation_needed redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_collation_needed redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_progress_handler redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::progress_handler redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_trace redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_profile redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::profile redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::commit_hook redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_commit_hook redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::rollback_hook redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_rollback_hook redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::update_hook redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_update_hook redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_set_authorizer redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::set_authorizer redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::busy_timeout redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_busy_timeout redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_backup_from_file redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::backup_from_file redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::backup_to_file redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_backup_to_file redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::table_column_metadata redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_table_column_metadata redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_db_filename redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::db_filename redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::register_fts3_perl_tokenizer redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_register_fts3_perl_tokenizer redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::sqlite_db_status redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::db_status redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::sqlite_st_status redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::st_status redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::compile_options redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::sqlite_status redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::OK redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::DENY redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::IGNORE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::CREATE_INDEX redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::CREATE_TABLE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::CREATE_TEMP_INDEX redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::CREATE_TEMP_TABLE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::CREATE_TEMP_TRIGGER redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::CREATE_TEMP_VIEW redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::CREATE_TRIGGER redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::CREATE_VIEW redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::DELETE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::DROP_INDEX redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::DROP_TABLE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::DROP_TEMP_INDEX redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::DROP_TEMP_TABLE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::DROP_TEMP_TRIGGER redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::DROP_TEMP_VIEW redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::DROP_TRIGGER redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::DROP_VIEW redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::INSERT redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::PRAGMA redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::READ redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::SELECT redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::TRANSACTION redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::UPDATE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::ATTACH redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::DETACH redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::ALTER_TABLE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::REINDEX redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::ANALYZE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::CREATE_VTABLE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::DROP_VTABLE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::FUNCTION redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::SAVEPOINT redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::dr::dbixs_revision redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::dr::discon_all_ redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::dr::disconnect_all redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::_login redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::selectall_arrayref redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::selectrow_array redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::selectrow_arrayref redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::last_insert_id redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::commit redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::rollback redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::disconnect redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::STORE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::FETCH redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::db::DESTROY redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::_prepare redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::rows redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::bind_col redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::bind_param redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::bind_param_inout redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::execute redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::fetchrow_arrayref redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::fetch redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::fetchrow_array redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::fetchrow redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::fetchall_arrayref redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::finish redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::blob_read redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::STORE redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::FETCH_attrib redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::FETCH redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.
Subroutine DBD::SQLite::st::DESTROY redefined at /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm line 17.

如果我在数据库中添加代码，操作就会成功，如果我删除-w，错误就不会出现。但我喜欢我的代码是“-w干净”

这让我有点困惑。这些确实是DBD:：SQLite的来源。我在/usr/bin/perl处使用系统perl：

$ ls -l /usr/bin/perl
-rwxr-xr-x  1 root  wheel  66608 Dec  1 12:45 /usr/bin/perl
$ file /usr/bin/perl
/usr/bin/perl: Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit executable x86_64] [i386:Mach-O executable i386]
/usr/bin/perl (for architecture x86_64):    Mach-O 64-bit executable x86_64
/usr/bin/perl (for architecture i386):  Mach-O executable i386

我在这两个系统上都使用了自制软件，但在/System和/usr/bin/perl-V中都没有写：

  @INC:
    /Library/Perl/5.18/darwin-thread-multi-2level
    /Library/Perl/5.18
    /Network/Library/Perl/5.18/darwin-thread-multi-2level
    /Network/Library/Perl/5.18
    /Library/Perl/Updates/5.18.2/darwin-thread-multi-2level
    /Library/Perl/Updates/5.18.2
    /System/Library/Perl/5.18/darwin-thread-multi-2level
    /System/Library/Perl/5.18
    /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level
    /System/Library/Perl/Extras/5.18
    .

（不，我当前目录中没有任何模块）

DBD:：SQLite位于/System中：

$ ll /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm 
-rw-r--r--  1 root  wheel  87746 Jul 27  2013 /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm

值得一提的是，字符串DBD、SQLite和NEWAPI甚至没有出现在/System/Library/Perl/5.18/constants.pm中：-(

盒子上只有一个SQLite.pm：

$ locate SQLite|grep DBD 
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/share/man/man3/DBD::SQLite.3pm
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/share/man/man3/DBD::SQLite5.18.3pm
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/share/man/man3/DBD::SQLite::Cookbook.3pm
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/share/man/man3/DBD::SQLite::Cookbook5.18.3pm
/System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite
/System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite/Cookbook.pod
/System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm
/System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/auto/DBD/SQLite
/System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/auto/DBD/SQLite/SQLite.bs
/System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/auto/DBD/SQLite/SQLite.bundle

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我常用的调试方法——在StackOverflow中输入详细的帖子并通过自白调试自己解决问题，似乎失败了。有什么想法吗？

你不需要

使用

DBD模块。当你调用

DBI->connect

时，它会由DBI自动加载。删除多余的

使用

会让你的错误安静下来

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详细信息：在大多数操作系统上，

使用DBD:：sqlite

会失败——该模块实际上被称为

DBD:：sqlite

（大写“SQL”）。它在macOS上成功，因为文件系统不区分大小写，所以可以使用任意一个名称加载模块；但是，这会导致DBI再次加载该模块。

非常有趣。我使用DBI+DBD已经20多年了，在调用DBI connect之前，我总是通过use加载DBD模块。。显然，我一直在做错误的事情或者20多年，因为没有一个主要司机的医生这么说。

$ locate SQLite|grep DBD 
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/share/man/man3/DBD::SQLite.3pm
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/share/man/man3/DBD::SQLite5.18.3pm
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/share/man/man3/DBD::SQLite::Cookbook.3pm
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/share/man/man3/DBD::SQLite::Cookbook5.18.3pm
/System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite
/System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite/Cookbook.pod
/System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/DBD/SQLite.pm
/System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/auto/DBD/SQLite
/System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/auto/DBD/SQLite/SQLite.bs
/System/Library/Perl/Extras/5.18/darwin-thread-multi-2level/auto/DBD/SQLite/SQLite.bundle