Use URI path for in-memory database

[uklotzde]

• Use a named in-memory DB for testing
• Use URI file paths for databases
• Disable LibraryScanner during library tests Fix runtime dependencies of LibraryScanner #2515
• Remove dependencies on TrackCollection from LibraryScanner Fix runtime dependencies of LibraryScanner #2515
• Use Qt::DirectConnection for signal-to-signal connections Fix runtime dependencies of LibraryScanner #2515

Our connection pool does not work correctly with anonymous in-memory database connections that are used for testing. Only the database schema of the connection on the main thread will be initialized. Connections on other threads start with a fresh database and all queries are doomed to fail!

The tests succeed, but the log is spammed:

LibraryScanner - Cleaning up database...
FwdSqlQuery - Failed to prepare "DELETE FROM LibraryHashes WHERE hash <> :unequalHash AND directory_path NOT IN (SELECT directory FROM track_locations)" : QSqlError("1", "Unable to execute statement", "no such table: LibraryHashes")
DEBUG ASSERT: "query.isPrepared()" in function int {anonymous}::execCleanupQuery(FwdSqlQuery&) at src/library/scanner/libraryscanner.cpp:31
LibraryScanner - Failed to delete orphaned directory hashes
LibraryScanner - Finished database cleanup: 0 ms
src/library/dao/playlistdao.cpp 28 FAILED QUERY [ "SELECT COUNT(*) from PlaylistTracks" ] QSqlError("", "Unable to fetch row", "No query")
src/library/dao/playlistdao.cpp 34 FAILED QUERY [ "SELECT track_id, playlist_id from PlaylistTracks" ] QSqlError("", "Unable to fetch row", "No query")
LibraryScanner - Event loop starting

Fixed by using a named in-memory connection with the actual file name and an additional mode parameter.

Nevertheless I have disabled the LibraryScanner inside TrackCollectionManager during tests to avoid issues caused by concurrent database cleanup tasks that are executed by the LibraryScanner on startup unconditionally.

TODO (see code): The LibraryScanner doesn't belong in there and should be extracted and decoupled from TrackCollectionManager in the long term. #2515

[uklotzde]

Out of a sudden various test started to fail in #2508 with SegFaults. After sorting out the dependencies between TrackCollectionManager and LibraryScanner and disabling the LibraryScanner during test runs those issues seem to be solved. That's the reason why this PR got bigger than expected.

[daschuer]

Some minor performance tweaks ...
Just building to test this.

[daschuer]

Unfortunately the library is empty with this PR.

Warning [Main]: QObject::moveToThread: Cannot move objects with a parent
Critical [Main]: DEBUG ASSERT: "!s_pInstance" in function static void GlobalTrackCache::createInstance(GlobalTrackCacheSaver*, deleteTrackFn_t) at /home/daniel/workspace/qt5mixxx/src/track/globaltrackcache.cpp:200
Warning [Main]: /home/daniel/workspace/qt5mixxx/src/library/basetrackcache.cpp 304 FAILED QUERY [ "SELECT id,played,timesplayed,album_artist,album,artist,title,year,rating,genre,composer,grouping,tracknumber,key,key_id,bpm,bpm_lock,duration,bitrate,replaygain,filetype,datetime_added,location,fs_deleted,comment,mixxx_deleted,color,coverart_source,coverart_type,coverart_location,coverart_hash FROM library_cache_view" ] QSqlError("", "Unable to fetch row", "No query")
Warning [Main]: /home/daniel/workspace/qt5mixxx/src/library/basetrackcache.cpp 558 FAILED QUERY [ "SELECT id FROM library_cache_view WHERE (datetime_added > datetime('now', '-7 days')) AND id in (965,986,44,987,984,985,988,39,978,979,976,58,977,59,982,983,62,981,63,60,61,50,51,48,49,54,55,53,10,11,8,9,14,15,12,3,1,6,4,5,27,24,25,30,16,17,22,23,20,21,98,99,97,74,75,72,73,78,79,77,66,67,64,65,70,71,69,88,94,970,971,968,83,974,80,975,972,973,87,962,84,963,85,960,961,967) ORDER BY lower(artist) COLLATE mixxxLexicographicalCollationFunc ASC, lower(title) COLLATE mixxxLexicographicalCollationFunc ASC, CASE key_id WHEN NULL THEN 0 WHEN 0 THEN 0 WHEN 1 THEN 1 WHEN 2 THEN 15 WHEN 3 THEN 5 WHEN 4 THEN 19 WHEN 5 THEN 9 WHEN 6 THEN 23 WHEN 7 THEN 13 WHEN 8 THEN 3 WHEN 9 THEN 17 WHEN 10 THEN 7 WHEN 11 THEN 21 WHEN 12 THEN 11 WHEN 13 THEN 20 WHEN 14 THEN 10 WHEN 15 THEN 24 WHEN 16 THEN 14 WHEN 17 THEN 4 WHEN 18 THEN 18 WHEN 19 THEN 8 WHEN 20 THEN 22 WHEN 21 THEN 12 WHEN 22 THEN 2 WHEN 23 THEN 16 WHEN 24 THEN 6 END COLLATE mixxxLexicographicalCollationFunc ASC" ] QSqlError("", "Unable to fetch row", "No query")
Warning [Main]: /home/daniel/workspace/qt5mixxx/src/library/basetrackcache.cpp 558 FAILED QUERY [ "SELECT id FROM library_cache_view WHERE (datetime_added > datetime('now', '-7 days')) AND id in (965,986,44,987,984,985,988,39,978,979,976,58,977,59,982,983,62,981,63,60,61,50,51,48,49,54,55,53,10,11,8,9,14,15,12,3,1,6,4,5,27,24,25,30,16,17,22,23,20,21,98,99,97,74,75,72,73,78,79,77,66,67,64,65,70,71,69,88,94,970,971,968,83,974,80,975,972,973,87,962,84,963,85,960,961,967) ORDER BY lower(artist) COLLATE mixxxLexicographicalCollationFunc ASC, lower(title) COLLATE mixxxLexicographicalCollationFunc ASC, CASE key_id WHEN NULL THEN 0 WHEN 0 THEN 0 WHEN 1 THEN 1 WHEN 2 THEN 15 WHEN 3 THEN 5 WHEN 4 THEN 19 WHEN 5 THEN 9 WHEN 6 THEN 23 WHEN 7 THEN 13 WHEN 8 THEN 3 WHEN 9 THEN 17 WHEN 10 THEN 7 WHEN 11 THEN 21 WHEN 12 THEN 11 WHEN 13 THEN 20 WHEN 14 THEN 10 WHEN 15 THEN 24 WHEN 16 THEN 14 WHEN 17 THEN 4 WHEN 18 THEN 18 WHEN 19 THEN 8 WHEN 20 THEN 22 WHEN 21 THEN 12 WHEN 22 THEN 2 WHEN 23 THEN 16 WHEN 24 THEN 6 END COLLATE mixxxLexicographicalCollationFunc ASC" ] QSqlError("", "Unable to fetch row", "No query")
Warning [Main]: /home/daniel/workspace/qt5mixxx/src/library/basetrackcache.cpp 558 FAILED QUERY [ "SELECT id FROM library_cache_view WHERE id in (965,986,44,987,984,985,988,39,978,979,976,58,977,59,982,983,62,981,63,60,61,50,51,48,49,54,55,53,10,11,8,9,14,15,12,3,1,6,4,5,27,24,25,30,16,17,22,23,20,21,98,99,97,74,75,72,73,78,79,77,66,67,64,65,70,71,69,88,94,970,971,968,83,974,80,975,972,973,87,962,84,963,85,960,961,967) ORDER BY duration COLLATE mixxxLexicographicalCollationFunc ASC, bpm COLLATE mixxxLexicographicalCollationFunc ASC, lower(title) COLLATE mixxxLexicographicalCollationFunc ASC" ] QSqlError("", "Unable to fetch row", "No query")
Warning [Controller]: USB permissions problem (or device error.) Your account needs write access to USB HID controllers.
Warning [Main]: /home/daniel/workspace/qt5mixxx/src/library/basetrackcache.cpp 558 FAILED QUERY [ "SELECT id FROM library_cache_view WHERE id in (965,986,44,987,984,985,39,978,979,58,982,59,983,981,62,63,60,61,50,51,48,49,54,55,53,10,11,9,14,15,12,3,1,6,4,5,27,24,25,30,16,17,22,23,20,21,98,99,97,74,75,72,73,78,79,77,66,67,64,65,70,71,69,94,968,83,80,975,972,973,962,84,963,967) " ] QSqlError("", "Unable to fetch row", "No query")
Warning [Main]: /home/daniel/workspace/qt5mixxx/src/library/basetrackcache.cpp 558 FAILED QUERY [ "SELECT id FROM library_cache_view WHERE id in (965,986,44,987,984,985,988,39,978,979,976,58,977,59,982,983,62,981,63,60,61,50,51,48,49,54,55,53,10,11,8,9,14,15,12,3,1,6,4,5,27,24,25,30,16,17,22,23,20,21,98,99,97,74,75,72,73,78,79,77,66,67,64,65,70,71,69,88,94,970,971,968,83,974,80,975,972,973,87,962,84,963,85,960,961,967) ORDER BY duration COLLATE mixxxLexicographicalCollationFunc ASC, bpm COLLATE mixxxLexicographicalCollationFunc ASC, lower(title) COLLATE mixxxLexicographicalCollationFunc ASC" ] QSqlError("", "Unable to fetch row", "No query")
Warning [Main]: /home/daniel/workspace/qt5mixxx/src/library/basetrackcache.cpp 558 FAILED QUERY [ "SELECT id FROM library_cache_view WHERE id in (415,412,413,402,403,400,401,406,407,404,405,362,363,360,361,366,367,364,365,354,355,352,353,358,359,356,357,378,379,376,377,382,383,380,381,370,371,368,369,374,375,372,373,330,331,328,329,334,335,332,333,322,323,320,321,326,327,324,325,346,347,344,345,350,351,348,349,338,339,336,337,342,343,340,341,298,299,296,297,302,303,300,301,290,291,288,289,294,295,292,293,314,315,312,313,318,319,316,317,306,307,304,305,310,311,308,309,266,267,264,265,270,271,268,269,258,259,256,257,262,263,260,261,282,283,280,281,286,287,284,285,274,275,272,273,278,279,276,277,234,235,232,233,238,239,236,237,226,227,224,225,230,231,228,229,250,251,248,249,254,255,252,253,242,243,240,241,246,247,244,245,202,203,200,201,206,207,204,205,194,195,192,193,198,199,196,197,218,219,216,217,222,223,220,221,210,211,208,209,214,215,212,213,170,171,168,169,174,175,172,173,162,163,160,161,166,167,164,165,186,187,184,185,190,191,188,189,178,179,176,177,182,183,180,181,138,139,136,137,142,143,140,141,130,131,128,129,134,135,132,133,154,155,152,153,158,159,156,157,146,147,144,145,150,151,148,149,106,107,104,105,110,111,108,109,102,103,100,101,122,123,120,121,126,127,124,125,114,115,112,113,118,119,116,117,76,68,91,89,92,93,86,46,47,45,56,13,7,18,969,980,938,939,936,937,942,943,940,941,930,931,928,929,934,935,932,933,954,955,952,953,958,959,956,957,946,947,944,945,950,951,948,949,906,907,904,905,910,911,908,909,898,899,896,897,902,903,900,901,922,923,920,921,926,927,924,925,914,915,912,913,918,919,916,917,874,875,872,873,878,879,876,877,866,867,864,865,870,871,868,869,890,891,888,889,894,895,892,893,882,883,880,881,886,887,884,885,842,843,840,841,846,847,844,845,834,835,832,833,838,839,836,837,858,859,856,857,862,863,860,861,850,851,848,849,854,855,852,853,810,811,808,809,814,815,812,813,802,803,800,801,806,807,804,805,826,827,824,825,830,831,828,829,818,819,816,817,822,823,820,821,778,779,776,777,782,783,780,781,770,771,768,769,774,775,772,773,794,795,792,793,798,799,796,797,786,787,784,785,790,791,788,789,746,747,744,745,750,751,748,749,738,739,736,737,742,743,740,741,762,763,760,761,766,767,764,765,754,755,752,753,758,759,756,757,714,715,712,713,718,719,716,717,706,707,704,705,710,711,708,709,730,731,728,729,734,735,732,733,722,723,720,721,726,727,724,725,682,683,680,681,686,687,684,685,674,675,672,673,678,679,676,677,698,699,696,697,702,703,700,701,690,691,688,689,694,695,692,693,650,651,648,649,654,655,652,653,642,643,640,641,646,647,644,645,666,667,664,665,670,671,668,669,658,659,656,657,662,663,660,661,618,619,616,617,622,623,620,621,610,611,608,609,614,615,612,613,634,635,632,633,638,639,636,637,626,627,624,625,630,631,628,629,586,587,584,585,590,591,588,589,578,579,576,577,582,583,580,581,602,603,600,601,606,607,604,605,594,595,592,593,598,599,596,597,554,555,552,553,558,559,556,557,546,547,544,545,550,551,548,549,570,571,568,569,574,575,572,573,562,563,560,561,566,567,564,565,522,523,520,521,526,527,524,525,514,515,512,513,518,519,516,517,538,539,536,537,542,543,540,541,530,531,528,529,534,535,532,533,490,491,488,489,494,495,492,493,482,483,480,481,486,487,484,485,506,507,504,505,510,511,508,509,498,499,496,497,502,503,500,501,458,459,456,457,462,463,460,461,450,451,448,449,454,455,452,453,474,475,472,473,478,479,476,477,466,467,464,465,470,471,468,469,426,427,424,425,430,431,428,429,418,419,416,417,422,423,420,421,442,443,440,441,446,447,444,445,434,435,432,433,438,439,436,437,394,395,392,393,398,399,396,397,386,387,384,385,390,391,388,389,410,411,408,409,414) " ] QSqlError("", "Unable to fetch row", "No query")
Warning [Main]: /home/daniel/workspace/qt5mixxx/src/library/basetrackcache.cpp 558 FAILED QUERY [ "SELECT id FROM library_cache_view WHERE id in (415,412,413,402,403,400,401,406,407,404,405,362,363,360,361,366,367,364,365,354,355,352,353,358,359,356,357,378,379,376,377,382,383,380,381,370,371,368,369,374,375,372,373,330,331,328,329,334,335,332,333,322,323,320,321,326,327,324,325,346,347,344,345,350,351,348,349,338,339,336,337,342,343,340,341,298,299,296,297,302,303,300,301,290,291,288,289,294,295,292,293,314,315,312,313,318,319,316,317,306,307,304,305,310,311,308,309,266,267,264,265,270,271,268,269,258,259,256,257,262,263,260,261,282,283,280,281,286,287,284,285,274,275,272,273,278,279,276,277,234,235,232,233,238,239,236,237,226,227,224,225,230,231,228,229,250,251,248,249,254,255,252,253,242,243,240,241,246,247,244,245,202,203,200,201,206,207,204,205,194,195,192,193,198,199,196,197,218,219,216,217,222,223,220,221,210,211,208,209,214,215,212,213,170,171,168,169,174,175,172,173,162,163,160,161,166,167,164,165,186,187,184,185,190,191,188,189,178,179,176,177,182,183,180,181,138,139,136,137,142,143,140,141,130,131,128,129,134,135,132,133,154,155,152,153,158,159,156,157,146,147,144,145,150,151,148,149,106,107,104,105,110,111,108,109,102,103,100,101,122,123,120,121,126,127,124,125,114,115,112,113,118,119,116,117,76,68,91,89,92,93,86,46,47,45,56,13,7,18,969,980,938,939,936,937,942,943,940,941,930,931,928,929,934,935,932,933,954,955,952,953,958,959,956,957,946,947,944,945,950,951,948,949,906,907,904,905,910,911,908,909,898,899,896,897,902,903,900,901,922,923,920,921,926,927,924,925,914,915,912,913,918,919,916,917,874,875,872,873,878,879,876,877,866,867,864,865,870,871,868,869,890,891,888,889,894,895,892,893,882,883,880,881,886,887,884,885,842,843,840,841,846,847,844,845,834,835,832,833,838,839,836,837,858,859,856,857,862,863,860,861,850,851,848,849,854,855,852,853,810,811,808,809,814,815,812,813,802,803,800,801,806,807,804,805,826,827,824,825,830,831,828,829,818,819,816,817,822,823,820,821,778,779,776,777,782,783,780,781,770,771,768,769,774,775,772,773,794,795,792,793,798,799,796,797,786,787,784,785,790,791,788,789,746,747,744,745,750,751,748,749,738,739,736,737,742,743,740,741,762,763,760,761,766,767,764,765,754,755,752,753,758,759,756,757,714,715,712,713,718,719,716,717,706,707,704,705,710,711,708,709,730,731,728,729,734,735,732,733,722,723,720,721,726,727,724,725,682,683,680,681,686,687,684,685,674,675,672,673,678,679,676,677,698,699,696,697,702,703,700,701,690,691,688,689,694,695,692,693,650,651,648,649,654,655,652,653,642,643,640,641,646,647,644,645,666,667,664,665,670,671,668,669,658,659,656,657,662,663,660,661,618,619,616,617,622,623,620,621,610,611,608,609,614,615,612,613,634,635,632,633,638,639,636,637,626,627,624,625,630,631,628,629,586,587,584,585,590,591,588,589,578,579,576,577,582,583,580,581,602,603,600,601,606,607,604,605,594,595,592,593,598,599,596,597,554,555,552,553,558,559,556,557,546,547,544,545,550,551,548,549,570,571,568,569,574,575,572,573,562,563,560,561,566,567,564,565,522,523,520,521,526,527,524,525,514,515,512,513,518,519,516,517,538,539,536,537,542,543,540,541,530,531,528,529,534,535,532,533,490,491,488,489,494,495,492,493,482,483,480,481,486,487,484,485,506,507,504,505,510,511,508,509,498,499,496,497,502,503,500,501,458,459,456,457,462,463,460,461,450,451,448,449,454,455,452,453,474,475,472,473,478,479,476,477,466,467,464,465,470,471,468,469,426,427,424,425,430,431,428,429,418,419,416,417,422,423,420,421,442,443,440,441,446,447,444,445,434,435,432,433,438,439,436,437,394,395,392,393,398,399,396,397,386,387,384,385,390,391,388,389,410,411,408,409,414) " ] QSqlError("", "Unable to fetch row", "No query")
Warning [Main]: /home/daniel/workspace/qt5mixxx/src/library/basetrackcache.cpp 558 FAILED QUERY [ "SELECT id FROM library_cache_view WHERE id in (965,986,44,987,984,985,988,39,978,979,976,58,977,59,982,983,62,981,63,60,61,50,51,48,49,54,55,53,10,11,8,9,14,15,12,3,1,6,4,5,27,24,25,30,16,17,22,23,20,21,98,99,97,74,75,72,73,78,79,77,66,67,64,65,70,71,69,88,94,970,971,968,83,974,80,975,972,973,87,962,84,963,85,960,961,967) ORDER BY duration COLLATE mixxxLexicographicalCollationFunc ASC, bpm COLLATE mixxxLexicographicalCollationFunc ASC, lower(title) COLLATE mixxxLexicographicalCollationFunc ASC" ] QSqlError("", "Unable to fetch row", "No query")
Warning [LibraryScanner 1]: QSqlDatabasePrivate::removeDatabase: connection 'MIXXX-2' is still in use, all queries will cease to work.

[daschuer]

I think you want here:
params.filePath += absFilePath;

[uklotzde]

🙈 Fixed

[uklotzde]

Merged #2513 into this PR to prevent merge conflicts.

[uklotzde]

Hopefully all done and fixed now. Those many open branches and PRs are hard to manage.

[daschuer]

Unfortunately my library is still empty after merging this branch.

This is the Log output:

Warning [Main]: /home/daniel/workspace/qt5mixxx/src/library/basetrackcache.cpp 273 FAILED QUERY [ "SELECT id,played,timesplayed,album_artist,album,artist,title,year,rating,genre,composer,grouping,tracknumber,key,key_id,bpm,bpm_lock,duration,bitrate,replaygain,filetype,datetime_added,location,fs_deleted,comment,mixxx_deleted,color,coverart_source,coverart_type,coverart_location,coverart_hash FROM library_cache_view" ] QSqlError("", "Unable to fetch row", "No query")
Warning [Main]: /home/daniel/workspace/qt5mixxx/src/library/basetrackcache.cpp 527 FAILED QUERY [ "SELECT id FROM library_cache_view WHERE (datetime_added > datetime('now', '-7 days')) AND id in (63,62,61,60,51,50,49,48,55,54,53,11,10,9,8,15,14,12,3,1,6,5,4,27,25,24,30,17,16,23,22,21,20,99,98,97,971,970,968,975,974,973,972,963,962,961,960,967,965,987,986,985,984,75,74,73,988,72,979,79,978,78,977,77,976,983,67,982,66,981,65,64,71,70,69,88,94,83,80,87,85,84,44,39,59,58) ORDER BY lower(artist) COLLATE mixxxLexicographicalCollationFunc ASC, lower(title) COLLATE mixxxLexicographicalCollationFunc ASC, CASE key_id WHEN NULL THEN 0 WHEN 0 THEN 0 WHEN 1 THEN 1 WHEN 2 THEN 15 WHEN 3 THEN 5 WHEN 4 THEN 19 WHEN 5 THEN 9 WHEN 6 THEN 23 WHEN 7 THEN 13 WHEN 8 THEN 3 WHEN 9 THEN 17 WHEN 10 THEN 7 WHEN 11 THEN 21 WHEN 12 THEN 11 WHEN 13 THEN 20 WHEN 14 THEN 10 WHEN 15 THEN 24 WHEN 16 THEN 14 WHEN 17 THEN 4 WHEN 18 THEN 18 WHEN 19 THEN 8 WHEN 20 THEN 22 WHEN 21 THEN 12 WHEN 22 THEN 2 WHEN 23 THEN 16 WHEN 24 THEN 6 END COLLATE mixxxLexicographicalCollationFunc ASC" ] QSqlError("", "Unable to fetch row", "No query")
Warning [Main]: /home/daniel/workspace/qt5mixxx/src/library/basetrackcache.cpp 527 FAILED QUERY [ "SELECT id FROM library_cache_view WHERE (datetime_added > datetime('now', '-7 days')) AND id in (63,62,61,60,51,50,49,48,55,54,53,11,10,9,8,15,14,12,3,1,6,5,4,27,25,24,30,17,16,23,22,21,20,99,98,97,971,970,968,975,974,973,972,963,962,961,960,967,965,987,986,985,984,75,74,73,988,72,979,79,978,78,977,77,976,983,67,982,66,981,65,64,71,70,69,88,94,83,80,87,85,84,44,39,59,58) ORDER BY lower(artist) COLLATE mixxxLexicographicalCollationFunc ASC, lower(title) COLLATE mixxxLexicographicalCollationFunc ASC, CASE key_id WHEN NULL THEN 0 WHEN 0 THEN 0 WHEN 1 THEN 1 WHEN 2 THEN 15 WHEN 3 THEN 5 WHEN 4 THEN 19 WHEN 5 THEN 9 WHEN 6 THEN 23 WHEN 7 THEN 13 WHEN 8 THEN 3 WHEN 9 THEN 17 WHEN 10 THEN 7 WHEN 11 THEN 21 WHEN 12 THEN 11 WHEN 13 THEN 20 WHEN 14 THEN 10 WHEN 15 THEN 24 WHEN 16 THEN 14 WHEN 17 THEN 4 WHEN 18 THEN 18 WHEN 19 THEN 8 WHEN 20 THEN 22 WHEN 21 THEN 12 WHEN 22 THEN 2 WHEN 23 THEN 16 WHEN 24 THEN 6 END COLLATE mixxxLexicographicalCollationFunc ASC" ] QSqlError("", "Unable to fetch row", "No query")
Warning [Main]: /home/daniel/workspace/qt5mixxx/src/library/basetrackcache.cpp 527 FAILED QUERY [ "SELECT id FROM library_cache_view WHERE id in (63,62,61,60,51,50,49,48,55,54,53,11,10,9,8,15,14,12,3,1,6,5,4,27,25,24,30,17,16,23,22,21,20,99,98,97,971,970,968,975,974,973,972,963,962,961,960,967,965,987,986,985,984,75,74,73,988,72,979,79,978,78,977,77,976,983,67,982,66,981,65,64,71,70,69,88,94,83,80,87,85,84,44,39,59,58) ORDER BY duration COLLATE mixxxLexicographicalCollationFunc ASC, bpm COLLATE mixxxLexicographicalCollationFunc ASC, lower(title) COLLATE mixxxLexicographicalCollationFunc ASC" ] QSqlError("", "Unable to fetch row", "No query")
Warning [Controller]: USB permissions problem (or device error.) Your account needs write access to USB HID controllers.
Warning [LibraryScanner 1]: QSqlDatabasePrivate::removeDatabase: connection 'MIXXX-2' is still in use, all queries will cease to work.

[uklotzde]

@daschuer I have absolutely no idea why this doesn't work for you. My plan is to split this PR into two separate parts: URI + everything else.

[uklotzde]

@daschuer Please test if #2515 works for you. We need to address the SQLite URI issues separately.

[uklotzde]

Rebased the URI in-memory database commits on master. The changes turned out to be completly independent of the LibraryScanner refactoring in #2515 . Both PRs solve the testing issues in a different way, both are justified.

[daschuer]

I am sorry for you re extra efforts because of my DB migration issue.

This one looks and works still good.