{"id":4009,"date":"2023-11-02T14:08:19","date_gmt":"2023-11-02T06:08:19","guid":{"rendered":"https:\/\/white-night.club\/?p=4009"},"modified":"2024-02-24T09:14:52","modified_gmt":"2024-02-24T01:14:52","slug":"pg22","status":"publish","type":"post","link":"https:\/\/white-night.club\/index.php\/2023\/11\/02\/pg22\/","title":{"rendered":"MIT6.5830 Lab1-GoDB\u5b9e\u9a8c\u8bb0\u5f55\uff08\u4e03\uff09"},"content":{"rendered":"\n

\u84b8\u84b8\u65e5\u4e0a\u3002\u770b\u770b\u80fd\u4e0d\u80fd\u4e00\u6b21\u5b9e\u9a8c\u8bb0\u5f55\u5c31\u5b8c\u6210Exercise 4\u3002<\/p>\n\n\n\n

<\/div>\n\n\n\n
\n

\u5b9e\u9a8c\u8bb0\u5f55<\/p>\nNewHeapFile<\/em><\/cite><\/blockquote>\n\n\n\n

\u5b8c\u4e8b\u5f00\u5934\u96be\uff0c\u5bf9\u4e8eheap_file\u800c\u8a00\u4e5f\u4e00\u6837\u3002<\/p>\n\n\n\n

\u521b\u5efa\u65b0\u7684\u5806\u6587\u4ef6\uff1f\u4e0d\u592a\u61c2\uff0c\u5148\u6765\u770b\u770bheapfile\u7684\u7ed3\u6784<\/p>\n\n\n\n

Go<\/span><\/path><\/path><\/svg><\/span>
type<\/span> <\/span>HeapFile<\/span> <\/span>struct<\/span> {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>\/\/ HeapFile should include the fields below;  you may want to add<\/span><\/span>\n\t<\/span>\/\/ additional fields<\/span><\/span>\n\tbufPool *BufferPool<\/span><\/span>\n\tsync.Mutex<\/span><\/span>\n<\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u4e00\u4e2a\u4e92\u65a5\u9501\u548c\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7684BufferPool\uff0c\u800cBufferPool\u662f\u4ec0\u4e48\uff1f\u5728\u4e0b\u9762\u7684\u6ce8\u91ca\u6709\u63d0\u5230<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
\/\/ - bp: the BufferPool that is used to store pages read from the HeapFile<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u90a3\u4e48heapfile\u901a\u8fc7bufPool\u7ba1\u7406\u591a\u4e2a\u9875\uff0c\u5927\u6982\u61c2\u4e86\u4e4b\u540e\u63a5\u4e0b\u6765\u5c31\u6765\u5b9e\u73b0NewHeapFile\u3002\u770b\u4e0b\u6ce8\u91ca\uff0cheapfile\u6709\u5b57\u6bb5\uff0c\u6709HeapFile\u7684\u6587\u4ef6\u540d\uff0c\u90a3\u4e48\u8fd8\u5f97\u5f80heapfile\u7684struct\u91cc\u5934\u52a0\u70b9\u4e1c\u897f\u3002<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
type<\/span> <\/span>HeapFile<\/span> <\/span>struct<\/span> {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>\/\/ HeapFile should include the fields below;  you may want to add<\/span><\/span>\n\t<\/span>\/\/ additional fields<\/span><\/span>\n\tbufPool *BufferPool<\/span><\/span>\n\tsync.Mutex<\/span><\/span>\n\tDesc     *TupleDesc<\/span><\/span>\n\tFromFile <\/span>string<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u90a3NewHeapFile\u4e5f\u5f88\u597d\u5199\u4e86\uff0c\u6ce8\u91ca\u91cc\u8fd8\u63d0\u5230\u5982\u679cfromFile\u4e0d\u5b58\u5728\u8bf4\u660edb\u8fd8\u6ca1\u6709heapFile\uff0c\u90a3\u6211\u4eec\u8fd8\u9700\u8981\u81ea\u5df1\u65b0\u5efa\u4e00\u4e2afromFile\u3002\u7136\u540e\u6211\u4eec\u76f4\u63a5\u8fd4\u56de\u5373\u53ef\u3002\u522b\u5fd8\u4e86file.close()\u3002<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> <\/span>NewHeapFile<\/span>(fromFile <\/span>string<\/span>, td *TupleDesc, bp *BufferPool) (*HeapFile, <\/span>error<\/span>) {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>file<\/span>, <\/span>_<\/span> := os.<\/span>OpenFile<\/span>(fromFile, os.O_RDWR|os.O_CREATE, <\/span>0666<\/span>)<\/span><\/span>\n\t<\/span>defer<\/span> file.<\/span>Close<\/span>()<\/span><\/span>\n\t<\/span>return<\/span> &HeapFile{FromFile: fromFile, Desc: td, bufPool: bp}, <\/span>nil<\/span> <\/span>\/\/replace me<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u63a5\u4e0b\u6765\u662fNumPages\uff0c\u600e\u4e48\u8ba1\u7b97heapfile\u4e2d\u6709\u591a\u5c11\u9875\u5462\uff1f\u6211\u60f3\u7684\u662f\u76f4\u63a5\u4eceBufferPool\u62ff\u4e0d\u5c31\u597d\u4e86….\u4f46markdown\u91cc\u9762\u5199\u4e86\u8981\u6c42\uff0c\u8981\u6211\u4eec\u901a\u8fc7fromFile\u7684\u6587\u4ef6\u5927\u5c0f\uff08File.Stat)\u8ba1\u7b97\u5f97\u5230numpages\u3002<\/p>\n\n\n\n
\u7136\u540e\u6211\u5c31\u5728\u8fd9\u4e0a\u9762\u82b1\u4e86\u4e00\u5929\u7684\u65f6\u95f4\u4feebug\uff0c\u63a5\u4e0b\u6765\u6162\u6162\u8bb2\u5427\u3002<\/p>\n\n\n\n
<\/div>\n\n\n\n
\n
\u5b9e\u9a8cbug\u4fee\u6b63<\/p>\nnumpages=0<\/em><\/cite><\/blockquote>\n\n\n\n
\u7b97numpages\u4e0d\u96be\u3002\u4ee3\u7801\u5f88\u7b80\u5355\u3002<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> (f *HeapFile) <\/span>NumPages<\/span>() <\/span>int<\/span> {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>fileInfo<\/span>, <\/span>err<\/span> := os.<\/span>Stat<\/span>(f.FromFile)<\/span><\/span>\n\t<\/span>if<\/span> err == <\/span>nil<\/span> {<\/span><\/span>\n\t\t<\/span>filesize<\/span> := <\/span>int<\/span>(fileInfo.<\/span>Size<\/span>())<\/span><\/span>\n\t\t<\/span>return<\/span> filesize \/ PageSize<\/span><\/span>\n\t}<\/span><\/span>\n\t<\/span>return<\/span> <\/span>0<\/span> <\/span>\/\/replace me<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u4f46\u662f\u6211\u53d1\u73b0\u4e0d\u7ba1\u600e\u4e48\u7b97numpages\u4e00\u76f4\u662f0\uff0c\u51e0\u6b21debug\u4e4b\u540e\u6211\u53d1\u73b0pagesize\u80af\u5b9a\u6ca1\u95ee\u9898\uff0c\u4e00\u76f4\u662f4096\u3002\u90a3\u4e48\u95ee\u9898\u5c31\u5728\u4e8eint(filesize)\/pagesize\u8fd9\u4e00\u6b65\u3002<\/p>\n\n\n\n
\u4e3a\u4ec0\u4e48\u662f0\uff1f\u65e2\u7136pagesize\u4e0d\u4e3a0\u90a3\u53ea\u6709\u53ef\u80fd\u662ffilesize\u4e3a0\u3002\u5f53\u7136\u5982\u679c\u4f60\u8fd8\u6ca1\u6709\u5f80\u540e\u5199\u7684\u8bddpagesize\u80af\u5b9a\u662f0\u3002\u4f46\u662f\u6211debug\u4e4b\u540e\u53d1\u73b0pagesize=48\uff0c\u8bf4\u660epagesize\u4e5f\u4e0d\u7b49\u4e8e0\u3002\u90a3\u4e48\u95ee\u9898\u5c31\u51fa\u5728\u4e24\u4e2a\u6570\u76f8\u9664\u8fd9\u91cc<\/mark>\u3002<\/p>\n\n\n\n
\u4e8e\u662f\u6211\u60f3\u4e86\u60f3\uff0c\u5728\u4e0a\u4e00\u8282\u7684heap_page\u4e2d\uff0c\u6211\u4eec\u662f\u600e\u4e48\u628atuple\u5199\u5165\u7f13\u51b2\u533a\uff0c\u53c8\u8bfb\u53d6\u7f13\u51b2\u533a\u7684\uff1f<\/p>\n\n\n\n
\u6309\u6211\u4e0a\u4e00\u8282\u7684\u601d\u8def\uff0c\u6709\u591a\u5c11\u8bb0\u5f55\u5c31\u5199\u591a\u5c11\u8bb0\u5f55\u3002\u90a3\u4e48\u95ee\u9898\u6765\u4e86\uff0cheap page\u6700\u540e\u4e00\u5b9a\u67094096\u5b57\u8282\u5417\uff1f\u4e0d\u4e00\u5b9a\uff0c\u4e0d\u662f\u5417\uff1f<\/mark>\u6709\u591a\u5c11\u5199\u591a\u5c11\uff0c\u90a3\u5269\u4e0b\u7684\u7a7a\u95f4\u5b8c\u5168\u5c31\u662f\u7a7a\u7684\u3002<\/p>\n\n\n\n
\u6240\u4ee5\u6211\u4eec\u8fd8\u9700\u8981\u5728\u5269\u4e0b\u7684\u4f4d\u7f6e\u586b\u4e0a0\u8865\u5168page\u76f4\u5230\u5b83\u67094096\u5b57\u8282\u3002\u4e14\u8bfb\u53d6\u7684\u65f6\u5019\u53ea\u8bfb\u53d6\u6709\u6548\u6570\u636e\u3002<\/p>\n\n\n\n
\u90a3\u4e48\u6211\u4eec\u9700\u8981\u4fee\u6539\u8bfb\u5199\u7f13\u51b2\u533a\u7684\u4e24\u4e2a\u51fd\u6570\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\u5b9e\u9a8c\u63d0\u5230\u4e86\uff1a\u4ece\u7f13\u51b2\u533a\u8bfb\u56de\u8bb0\u5f55\u7684\u65f6\u5019\uff0crid\u4e0d\u4e00\u5b9a\u548c\u5199\u5165\u8bb0\u5f55\u7684rid\u76f8\u7b49\uff0c\u4e3b\u8981\u662f\u56e0\u4e3atuple\u672c\u8eab\u5c31\u662f\u65e0\u5e8f\u5b58\u653e\u5728heap_page\u91cc\u7684\u3002<\/p>\n\n\n\n
\n
\u5199\u8005\u6ce8<\/p>\n\u4e00\u4e2apage\u5199\u5165buffer\u4e4b\u540e\uff0c\u8be5buffer\u53ef\u80fd\u7531\u5176\u5b83\u65b0\u7684page\u6765\u8bfb\u53d6\u3002\u6240\u4ee5\u4e0d\u80fd\u901a\u8fc7\u5728page\u7ed3\u6784\u4e2d\u52a0\u4e00\u4e2ausefulBytes\u6765\u5224\u65ad\u54ea\u4e9b\u6570\u636e\u6709\u6548–\u56e0\u4e3a\u5176\u5b83\u65b0\u7684page\u62ff\u4e0d\u5230\u8fd9\u4e2a\u503c\u3002<\/cite><\/blockquote>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> (h *heapPage) <\/span>toBuffer<\/span>() (*bytes.Buffer, <\/span>error<\/span>) {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>bytesBuffer<\/span> := <\/span>new<\/span>(bytes.Buffer)<\/span><\/span>\n\t<\/span>err<\/span> := binary.<\/span>Write<\/span>(bytesBuffer, binary.LittleEndian, h.Hdr)<\/span><\/span>\n\t<\/span>if<\/span> err != <\/span>nil<\/span> {<\/span><\/span>\n\t\t<\/span>return<\/span> <\/span>nil<\/span>, err<\/span><\/span>\n\t}<\/span><\/span>\n\t<\/span>for<\/span> <\/span>_<\/span>, <\/span>tuple<\/span> := <\/span>range<\/span> h.Tuple {<\/span><\/span>\n\t\t<\/span>if<\/span> tuple != <\/span>nil<\/span> {<\/span><\/span>\n\t\t\t<\/span>err<\/span> := tuple.<\/span>writeTo<\/span>(bytesBuffer)<\/span><\/span>\n\t\t\t<\/span>if<\/span> err != <\/span>nil<\/span> {<\/span><\/span>\n\t\t\t\t<\/span>return<\/span> <\/span>nil<\/span>, err<\/span><\/span>\n\t\t\t}<\/span><\/span>\n\t\t}<\/span><\/span>\n\t}<\/span><\/span>\n\t<\/span>paddingSize<\/span> := <\/span>4096<\/span> - bytesBuffer.<\/span>Len<\/span>()<\/span><\/span>\n\t<\/span>paddingBytes<\/span> := <\/span>make<\/span>([]<\/span>byte<\/span>, paddingSize)<\/span><\/span>\n\t<\/span>_<\/span>, <\/span>err<\/span> = bytesBuffer.<\/span>Write<\/span>(paddingBytes)<\/span><\/span>\n\t<\/span>if<\/span> err != <\/span>nil<\/span> {<\/span><\/span>\n\t\t<\/span>return<\/span> <\/span>nil<\/span>, err<\/span><\/span>\n\t}<\/span><\/span>\n<\/span>\n\t<\/span>return<\/span> bytesBuffer, <\/span>nil<\/span> <\/span>\/\/replace me<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u6211\u505a\u5b8c\u4e4b\u540e\u53d1\u73b0initFromBuffer\u8fd8\u6709\u4e2abug\u3002\u4e4b\u524d\u8bfb\u53d6\u7684\u65f6\u5019\u9519\u8bef\u7684\u521d\u59cb\u5316\u4e86Rid\uff0c\u5bfc\u81f4\u4ece\u78c1\u76d8\u4e2d\u8bfb\u53d6\u7684\u7b2c\u4e00\u4e2arid\u4f1a\u53d8\u6210\u4e86int\u7c7b\u578b\u7684\u503c\u3002\u5bfc\u81f4\u6ca1\u6cd5\u83b7\u53d6\u5230\u9875\u53f7pageNo\u3002\u65b0\u5efa\u4e00\u4e2aRecordID\u5bf9\u8c61\u7136\u540e\u521d\u59cb\u5316\u5373\u53ef\u3002<\/p>\n\n\n\n
rid\u53ef\u4ee5\u4e0d\u7528\u548c\u5199\u5165\u7684\u65f6\u5019\u4e00\u6837\uff0c\u6240\u4ee5\u76f4\u63a5SlotNo\u76f4\u63a5\u53d6i\u5c31\u884c\u3002<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> (h *heapPage) <\/span>initFromBuffer<\/span>(buf *bytes.Buffer) <\/span>error<\/span> {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>err<\/span> := binary.<\/span>Read<\/span>(buf, binary.LittleEndian, &h.Hdr)<\/span><\/span>\n\t<\/span>if<\/span> err != <\/span>nil<\/span> {<\/span><\/span>\n\t\t<\/span>return<\/span> err<\/span><\/span>\n\t}<\/span><\/span>\n\t<\/span>for<\/span> <\/span>i<\/span> := <\/span>0<\/span>; i < <\/span>int<\/span>(h.Hdr.UsedSlots); i++ {<\/span><\/span>\n\t\t<\/span>tuple<\/span>, <\/span>err<\/span> := <\/span>readTupleFrom<\/span>(buf, h.Desc)<\/span><\/span>\n\t\t<\/span>if<\/span> err != <\/span>nil<\/span> {<\/span><\/span>\n\t\t\t<\/span>return<\/span> err<\/span><\/span>\n\t\t}<\/span><\/span>\n\t\th.Tuple[i] = tuple<\/span><\/span>\n\t\t<\/span>rid<\/span> := RecordID{PageNo: h.PageNo, SlotNo: i}<\/span><\/span>\n\t\th.Tuple[i].<\/span>Rid<\/span> = rid<\/span><\/span>\n\t}<\/span><\/span>\n\t<\/span>return<\/span> <\/span>nil<\/span> <\/span>\/\/replace me<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u7136\u540e\u81ea\u5df1\u5728heap_file_test\u4e2d\u5199\u4e00\u4e2atest\u8bd5\u8bd5\uff0c\u770b\u770b\u80fd\u4e0d\u80fd\u62ff\u5230numpage=1\u3002<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> <\/span>TestNumPage<\/span>(t *testing.T) {<\/span><\/span>\n\t<\/span>var<\/span> <\/span>td<\/span> = TupleDesc{Fields: []FieldType{<\/span><\/span>\n\t\t{Fname: <\/span>"name"<\/span>, Ftype: StringType},<\/span><\/span>\n\t\t{Fname: <\/span>"age"<\/span>, Ftype: IntType},<\/span><\/span>\n\t}}<\/span><\/span>\n\t<\/span>bp<\/span> := <\/span>NewBufferPool<\/span>(<\/span>3<\/span>)<\/span><\/span>\n\tos.<\/span>Remove<\/span>(TestingFile)<\/span><\/span>\n\t<\/span>hf<\/span>, <\/span>_<\/span> := <\/span>NewHeapFile<\/span>(TestingFile, &td, bp)<\/span><\/span>\n\t<\/span>var<\/span> <\/span>t1<\/span> = Tuple{<\/span><\/span>\n\t\tDesc: td,<\/span><\/span>\n\t\tFields: []DBValue{<\/span><\/span>\n\t\t\tStringField{<\/span>"sam"<\/span>},<\/span><\/span>\n\t\t\tIntField{<\/span>25<\/span>},<\/span><\/span>\n\t\t}}<\/span><\/span>\n\thf.<\/span>insertTuple<\/span>(&t1, <\/span>NewTID<\/span>())<\/span><\/span>\n\tfmt.<\/span>Println<\/span>(hf.<\/span>NumPages<\/span>())<\/span><\/span>\n\t<\/span>_<\/span> = hf<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u80fd\u62ff\u5230\uff0c\u8bf4\u660e\u95ee\u9898\u89e3\u51b3\u3002\u540c\u65f6\u6211\u5728\u68c0\u67e5\u7684\u65f6\u5019\u53d1\u73b0insertTuple\u4e2d\u9ad8\u4eae\u7684\u5730\u65b9\u6ca1\u5199return\u5bfc\u81f4\u5faa\u73af\u6267\u884c\u591a\u6b21\uff0c\u6240\u4ee5\u8fd9\u91cc\u4e5f\u4fee\u6539\u4e00\u4e0b\u3002<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
\/\/ Insert the tuple into a free slot on the page, or return an error if there are<\/span><\/span>\n\/\/ no free slots.  Set the tuples rid and return it.<\/span><\/span>\nfunc<\/span> (h *heapPage) <\/span>insertTuple<\/span>(t *Tuple) (recordID, <\/span>error<\/span>) {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>rid<\/span> := RecordID{PageNo: h.PageNo, SlotNo: <\/span>0<\/span>}<\/span><\/span>\n\t<\/span>if<\/span> h.Hdr.UsedSlots == h.Hdr.TotalSlots {<\/span><\/span>\n\t\t<\/span>return<\/span> rid, errors.<\/span>New<\/span>(<\/span>"no free slots"<\/span>)<\/span><\/span>\n\t}<\/span><\/span>\n\t<\/span>for<\/span> <\/span>i<\/span>, <\/span>tuple<\/span> := <\/span>range<\/span> h.Tuple {<\/span><\/span>\n\t\t<\/span>if<\/span> tuple == <\/span>nil<\/span> {<\/span><\/span>\n\t\t\th.Tuple[i] = t<\/span><\/span>\n\t\t\t<\/span>rid.SlotNo<\/span> = i<\/span><\/span>\n\t\t\th.Tuple[i].<\/span>Rid<\/span> = rid<\/span><\/span>\n\t\t\th.Hdr.UsedSlots += <\/span>1<\/span><\/span>\n\t\t\t<\/span>return<\/span> rid, <\/span>nil<\/span><\/span>\n\t\t}<\/span><\/span>\n\t}<\/span><\/span>\n\t<\/span>return<\/span> rid, errors.<\/span>New<\/span>(<\/span>"Can't insert Tuple"<\/span>) <\/span>\/\/replace me<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u63a5\u4e0b\u6765\u7ee7\u7eed\u5b9e\u9a8c\u3002<\/p>\n\n\n\n
\n
\u5199\u8005\u6ce8<\/p>\n\u867d\u7136\u8fd9\u6bb5\u5199\u7684\u5f88\u5c11\uff0c\u4f46\u6211\u771f\u7684\u82b1\u4e866\u4e2a\u5c0f\u65f6\u591a\u7684\u65f6\u95f4\u53cd\u590ddebug\u3002bufferpool.getPage()\u4e4b\u7c7b\u7684\u9519\u8bef\u771f\u7684\u5f88\u96be\u627e\u51fa\u6765\uff0c\u4e0d\u8fc7debug\u5b8c\u4e4b\u540e\u6211\u5bf9godb\u7684\u7406\u89e3\u4e5f\u66f4\u6df1\u4e86\u5012\u662f\u771f\u7684\u3002<\/cite><\/blockquote>\n\n\n\n
<\/div>\n\n\n\n
\n
\u5b9e\u9a8c\u6b65\u9aa4<\/p>\ngetPage<\/cite><\/blockquote>\n\n\n\n
\u5728\u6b64\u4e4b\u524d\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u56de\u5230buffer_pool\u4e2d\u8865\u5168\u51e0\u6bb5\u4ee3\u7801\u3002\u56e0\u4e3a\u6211\u4eec\u63a5\u4e0b\u6765\u7684\u64cd\u4f5c\u90fd\u8981\u548cbufferpool\u6253\u4ea4\u9053\u3002<\/p>\n\n\n\n
\u4ecegetPage\u7684\u6ce8\u91ca\u5165\u624b\uff0c\u518d\u5230pageKey\u7684\u6ce8\u91ca\uff0c\u53ef\u4ee5\u63a8\u51fabufferpool\u901a\u8fc7hashmap\u7684\u65b9\u5f0f\u5b58\u50a8\u4e0d\u540c\u7684heappage\u3002\u5176\u4e2dkey\u7684\u7c7b\u578b\u4e3aheaphash\u3002<\/p>\n\n\n\n
\u4f46\u662fpageKey\u8fd4\u56de\u7684\u662fany\uff0c\u6240\u4ee5\u6211\u4eec\u8fd8\u662f\u9009any\u7c7b\u578b\u4f5c\u4e3akey\u3002\u6240\u4ee5\u6240\u4ee5bp\u7684\u7ed3\u6784\u548c\u521d\u59cb\u5316\u5e94\u8be5\u4e3a<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
type<\/span> <\/span>BufferPool<\/span> <\/span>struct<\/span> {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\tNumPages <\/span>int<\/span><\/span>\n\tPages    <\/span>map<\/span>[any]*Page<\/span><\/span>\n}<\/span><\/span>\n<\/span>\n\/\/ Create a new BufferPool with the specified number of pages<\/span><\/span>\nfunc<\/span> <\/span>NewBufferPool<\/span>(numPages <\/span>int<\/span>) *BufferPool {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>return<\/span> &BufferPool{NumPages: numPages, Pages: <\/span>make<\/span>(<\/span>map<\/span>[any]*Page, numPages)}<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u987a\u5e26\u8865\u5168pageKey<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> (f *HeapFile) <\/span>pageKey<\/span>(pgNo <\/span>int<\/span>) any {<\/span><\/span>\n<\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>hH<\/span> := heapHash{FileName: f.FromFile, PageNo: pgNo}<\/span><\/span>\n\t<\/span>return<\/span> hH<\/span><\/span>\n<\/span>\n}<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
\u63a5\u4e0b\u6765\u8865\u5168getPage\u3002\u5982\u679c\u7f13\u51b2\u6c60\u6ca1\u6709page\uff0c\u90a3\u5c31\u7ed9\u5bf9\u5e94\u7684\u4e0b\u6807\u521d\u59cb\u5316\u4e00\u4e2apage\u3002\u800c\u7f13\u51b2\u6c60\u7684\u5927\u5c0f\u6709NumPages\u51b3\u5b9a\u3002\u4e5f\u5c31\u662f\u8bf4\u8fd9\u4e2a\u7f13\u51b2\u6c60\u6700\u591a\u5b583\u9875\u3002<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> (bp *BufferPool) <\/span>GetPage<\/span>(file DBFile, pageNo <\/span>int<\/span>, tid TransactionID, perm RWPerm) (*Page, <\/span>error<\/span>) {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>key<\/span> := file.<\/span>pageKey<\/span>(pageNo)<\/span><\/span>\n\t<\/span>if<\/span> bp.Pages[key] == <\/span>nil<\/span> {<\/span><\/span>\n\t\t<\/span>page<\/span>, <\/span>err<\/span> := file.<\/span>readPage<\/span>(pageNo)<\/span><\/span>\n\t\t<\/span>if<\/span> err != <\/span>nil<\/span> {<\/span><\/span>\n\t\t\t<\/span>return<\/span> <\/span>nil<\/span>, err<\/span><\/span>\n\t\t}<\/span><\/span>\n\t\tbp.Pages[key] = page<\/span><\/span>\n\t\t<\/span>return<\/span> bp.Pages[key], <\/span>nil<\/span><\/span>\n\t} <\/span>else<\/span> {<\/span><\/span>\n\t\t<\/span>return<\/span> bp.Pages[key], <\/span>nil<\/span><\/span>\n\t}<\/span><\/span>\n<\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u81f3\u4e8e\u9501\u548c\u9a71\u9010\u7b97\u6cd5\u6211\u51b3\u5b9a\u5148\u4e0d\u7ba1\u3002\u7b49\u540e\u7eed\u7684lab\u5b9e\u73b0\u4e8b\u52a1\u7684\u65f6\u5019\u518d\u4e00\u8d77\u5904\u7406\u3002<\/p>\n\n\n\n
<\/div>\n\n\n\n
\n
\u5b9e\u9a8c\u6b65\u9aa4<\/p>\n\u5b8c\u6210heap_file<\/em><\/cite><\/blockquote>\n\n\n\n
\u8981\u60f3\u8dd1\u901aheap_file_test.go\u7684\u5168\u90e8test\uff0c\u8fd8\u6709\u201c\u4ebf\u201d\u4e9b\u4ee3\u7801\u8981\u8865\u5168\u3002<\/p>\n\n\n\n
readPage\u8fd8\u597d\uff0c\u7b80\u5355\u6765\u8bf4\u5c31\u662f\u4ece\u78c1\u76d8\u8bfbpage\u3002\u7531\u4e8e\u6bcf\u9875\u90fd\u4e00\u5b9a\u662f4096\u5927\u5c0f\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u4ece\u6307\u5b9a\u4e0b\u6807\u5f00\u59cb\u8bfb\u53d6\u6307\u5b9a\u9875\u3002<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> (f *HeapFile) <\/span>readPage<\/span>(pageNo <\/span>int<\/span>) (*Page, <\/span>error<\/span>) {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>file<\/span>, <\/span>_<\/span> := os.<\/span>OpenFile<\/span>(f.FromFile, os.O_RDWR|os.O_CREATE, <\/span>0666<\/span>)<\/span><\/span>\n\t<\/span>defer<\/span> file.<\/span>Close<\/span>()<\/span><\/span>\n\t<\/span>bytesBuffer<\/span> := <\/span>make<\/span>([]<\/span>byte<\/span>, PageSize)<\/span><\/span>\n\t<\/span>_<\/span>, <\/span>err<\/span> := file.<\/span>ReadAt<\/span>(bytesBuffer, <\/span>int64<\/span>(pageNo*PageSize))<\/span><\/span>\n\t<\/span>if<\/span> err != <\/span>nil<\/span> {<\/span><\/span>\n\t\t<\/span>return<\/span> <\/span>nil<\/span>, err<\/span><\/span>\n\t}<\/span><\/span>\n\t<\/span>hp<\/span> := <\/span>newHeapPage<\/span>(f.Desc, pageNo, f)<\/span><\/span>\n\thp.<\/span>initFromBuffer<\/span>(bytes.<\/span>NewBuffer<\/span>(bytesBuffer))<\/span><\/span>\n\t<\/span>var<\/span> <\/span>page<\/span> Page = hp<\/span><\/span>\n\t<\/span>return<\/span> &page, <\/span>nil<\/span><\/span>\n}<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
insertTuple\u5c31\u8981\u8003\u8651\u8003\u8651\u4e86\u3002\u5982\u679c\u6570\u636e\u5e93\u6587\u4ef6\u662f\u7a7a\u7684\u90a3\u6211\u4eec\u5f97\u65b0\u5efa\u4e00\u4e2apage\u6254\u8fdbbp\uff0c\u518dbp\u4e2d\u5bf9page\u4f5c\u64cd\u4f5c\u3002\u6ce8\u91ca\u8fd8\u63d0\u5230\u8981\u628a\u5b83\u5199\u5165\u78c1\u76d8\uff08flushpage\uff09\uff0c\u6240\u4ee5\u4ee3\u7801\u5982\u4e0b<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> (f *HeapFile) <\/span>insertTuple<\/span>(t *Tuple, tid TransactionID) <\/span>error<\/span> {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>inserted<\/span> := <\/span>false<\/span><\/span>\n\t<\/span>for<\/span> <\/span>i<\/span> := <\/span>0<\/span>; i < f.<\/span>NumPages<\/span>(); i++ {<\/span><\/span>\n\t\t<\/span>pg<\/span>, <\/span>err<\/span> := f.bufPool.<\/span>GetPage<\/span>(f, i, tid, ReadPerm)<\/span><\/span>\n\t\t<\/span>if<\/span> err != <\/span>nil<\/span> {<\/span><\/span>\n\t\t\t<\/span>return<\/span> err<\/span><\/span>\n\t\t}<\/span><\/span>\n\t\t<\/span>hp<\/span> := (*pg).(*heapPage)<\/span><\/span>\n\t\t<\/span>for<\/span> <\/span>j<\/span> := <\/span>0<\/span>; j < <\/span>int<\/span>(hp.Hdr.TotalSlots); j++ {<\/span><\/span>\n\t\t\t<\/span>if<\/span> hp.Tuple[j] == <\/span>nil<\/span> {<\/span><\/span>\n\t\t\t\thp.<\/span>insertTuple<\/span>(t)<\/span><\/span>\n\t\t\t\t<\/span>inserted<\/span> = <\/span>true<\/span><\/span>\n\t\t\t\t<\/span>return<\/span> <\/span>nil<\/span><\/span>\n\t\t\t}<\/span><\/span>\n\t\t}<\/span><\/span>\n\t}<\/span><\/span>\n\t<\/span>if<\/span> !inserted {<\/span><\/span>\n\t\t<\/span>\/\/Create HeapPage, insert tuple, flush page<\/span><\/span>\n\t\t<\/span>hp<\/span> := <\/span>newHeapPage<\/span>(f.Desc, f.<\/span>NumPages<\/span>(), f)<\/span><\/span>\n\t\thp.<\/span>insertTuple<\/span>(t)<\/span><\/span>\n\t\t<\/span>var<\/span> <\/span>page<\/span> Page = hp<\/span><\/span>\n\t\tf.<\/span>flushPage<\/span>(&page)<\/span><\/span>\n\t}<\/span><\/span>\n\t<\/span>return<\/span> <\/span>nil<\/span> <\/span>\/\/replace me<\/span><\/span>\n<\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u5220\u9664tuple\u4e5f\u8fd8\u597d\u3002\u9996\u5148\u5220\u9664\u80af\u5b9a\u662f\u4ece\u5df2\u6709\u7684tuple\u4e2d\u6311\u4e00\u4e2a\u5220\u9664\u3002\u90a3\u4e48\u6211\u4eec\u53ea\u9700\u8981\u901a\u8fc7\u6bcf\u4e2atuple\u552f\u4e00\u4e0d\u91cd\u590d\u7684rid\u6765\u5224\u65ad\u5373\u53ef\u3002<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> (f *HeapFile) <\/span>deleteTuple<\/span>(t *Tuple, tid TransactionID) <\/span>error<\/span> {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>for<\/span> <\/span>i<\/span> := <\/span>0<\/span>; i < f.<\/span>NumPages<\/span>(); i++ {<\/span><\/span>\n\t\t<\/span>pg<\/span>, <\/span>err<\/span> := f.bufPool.<\/span>GetPage<\/span>(f, i, tid, ReadPerm)<\/span><\/span>\n\t\t<\/span>if<\/span> err != <\/span>nil<\/span> {<\/span><\/span>\n\t\t\t<\/span>return<\/span> err<\/span><\/span>\n\t\t}<\/span><\/span>\n\t\t<\/span>hp<\/span> := (*pg).(*heapPage)<\/span><\/span>\n\t\t<\/span>err<\/span> = hp.<\/span>deleteTuple<\/span>(t.Rid)<\/span><\/span>\n\t\t<\/span>if<\/span> err != <\/span>nil<\/span> {<\/span><\/span>\n\t\t\t<\/span>return<\/span> err<\/span><\/span>\n\t\t}<\/span><\/span>\n\t}<\/span><\/span>\n\t<\/span>return<\/span> <\/span>nil<\/span> <\/span>\/\/replace me<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u63a5\u4e0b\u6765\u5c31\u662fflushpage\u3002\u628apage\u5199\u5230\u78c1\u76d8\u4e0a\u3002\u6ca1\u5565\u80fd\u8bb2\u7684\u3002<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> (f *HeapFile) <\/span>flushPage<\/span>(p *Page) <\/span>error<\/span> {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>\/\/You should write page to file(Disk)<\/span><\/span>\n\t<\/span>file<\/span>, <\/span>_<\/span> := os.<\/span>OpenFile<\/span>(f.FromFile, os.O_RDWR|os.O_CREATE, <\/span>0666<\/span>)<\/span><\/span>\n\t<\/span>defer<\/span> file.<\/span>Close<\/span>()<\/span><\/span>\n\t<\/span>\/\/Turn page to byte array<\/span><\/span>\n\t<\/span>hp<\/span> := (*p).(*heapPage)<\/span><\/span>\n\t<\/span>buffer<\/span>, <\/span>err<\/span> := hp.<\/span>toBuffer<\/span>()<\/span><\/span>\n\t<\/span>if<\/span> err != <\/span>nil<\/span> {<\/span><\/span>\n\t\t<\/span>return<\/span> err<\/span><\/span>\n\t}<\/span><\/span>\n\t<\/span>numOfBytes<\/span>, <\/span>err<\/span> := file.<\/span>WriteAt<\/span>(buffer.<\/span>Bytes<\/span>(), <\/span>int64<\/span>(hp.PageNo*PageSize))<\/span><\/span>\n<\/span>\n\t<\/span>_<\/span> = numOfBytes <\/span>\/\/TODO: remove this line after Debug<\/span><\/span>\n\t<\/span>return<\/span> err     <\/span>\/\/replace me<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u8fd4\u56dedesc\u7684\u4e5f\u5f88\u7b80\u5355\uff0c\u76f4\u63a5return\u5c31\u884c\u3002<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> (f *HeapFile) <\/span>Descriptor<\/span>() *TupleDesc {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>return<\/span> f.Desc <\/span>\/\/replace me<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u63a5\u4e0b\u6765\u662f\u8fed\u4ee3\uff0c\u867d\u7136page\u6709\u81ea\u5df1\u7684Iterator\uff0c\u4f46\u5728\u8fd9\u91cc\u6211\u4eec\u5148\u81ea\u5df1\u5b9e\u73b0\u8fed\u4ee3\u7684\u65b9\u6cd5\uff08\u4e3b\u8981\u662f\u65b9\u4fbf\u8c03\u8bd5\uff09\u3002<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> (f *HeapFile) <\/span>Iterator<\/span>(tid TransactionID) (<\/span>func<\/span>() (*Tuple, <\/span>error<\/span>), <\/span>error<\/span>) {<\/span><\/span>\n<\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>i<\/span> := <\/span>0<\/span><\/span>\n\t<\/span>j<\/span> := <\/span>0<\/span><\/span>\n\t<\/span>\/\/var iter func() (*Tuple, error)<\/span><\/span>\n\t<\/span>return<\/span> <\/span>func<\/span>() (*Tuple, <\/span>error<\/span>) {<\/span><\/span>\n\t\t<\/span>for<\/span> i < f.<\/span>NumPages<\/span>() {<\/span><\/span>\n\t\t\t<\/span>pg<\/span>, <\/span>err<\/span> := f.bufPool.<\/span>GetPage<\/span>(f, i, tid, ReadPerm)<\/span><\/span>\n\t\t\t<\/span>if<\/span> err != <\/span>nil<\/span> {<\/span><\/span>\n\t\t\t\t<\/span>return<\/span> <\/span>nil<\/span>, err<\/span><\/span>\n\t\t\t}<\/span><\/span>\n\t\t\t<\/span>hp<\/span> := (*pg).(*heapPage)<\/span><\/span>\n\t\t\t<\/span>for<\/span> j < <\/span>int<\/span>(hp.Hdr.TotalSlots) {<\/span><\/span>\n\t\t\t\t<\/span>if<\/span> hp.Tuple[j] != <\/span>nil<\/span> {<\/span><\/span>\n\t\t\t\t\t<\/span>tuple<\/span> := hp.Tuple[j]<\/span><\/span>\n\t\t\t\t\tj++<\/span><\/span>\n\t\t\t\t\t<\/span>return<\/span> tuple, <\/span>nil<\/span><\/span>\n\t\t\t\t} <\/span>else<\/span> {<\/span><\/span>\n\t\t\t\t\tj++<\/span><\/span>\n\t\t\t\t}<\/span><\/span>\n\t\t\t}<\/span><\/span>\n\t\t\t<\/span>j<\/span> = <\/span>0<\/span><\/span>\n\t\t\ti++<\/span><\/span>\n\t\t}<\/span><\/span>\n\t\t<\/span>return<\/span> <\/span>nil<\/span>, <\/span>nil<\/span><\/span>\n\t}, <\/span>nil<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
<\/div>\n\n\n\n
\n
\u5b9e\u9a8c\u6b65\u9aa4<\/p>\n\u901a\u8fc7heap_file_test.go<\/em><\/cite><\/blockquote>\n\n\n\n
\u770b\u4e86\u4e0btest\uff0c\u8fd8\u8981\u8865\u5168bufferpool\u91cc\u9762\u7684flushAllPage\u3002<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> (bp *BufferPool) <\/span>FlushAllPages<\/span>() {<\/span><\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>for<\/span> <\/span>_<\/span>, <\/span>page<\/span> := <\/span>range<\/span> bp.Pages {<\/span><\/span>\n\t\t<\/span>p<\/span> := *page<\/span><\/span>\n\t\t<\/span>file<\/span> := *p.<\/span>getFile<\/span>()<\/span><\/span>\n\t\tfile.<\/span>flushPage<\/span>(&p)<\/span><\/span>\n\t}<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u8865\u5168\u4e4b\u540e\u76f4\u63a5run file test\uff0c\u8fc7\u3002\uff08\u82b1\u4e86\u51e0\u5929\u7ec8\u4e8e\u8fc7\u4e86\uff0c\u4ee4\u4eba\u611f\u6168\uff09<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u4ee5\u9632\u4e07\u4e00\u6211\u53c8\u5355\u72ec\u8dd1\u4e86\u6bcf\u4e2atest\u5355\u5143\u3002\u6211\u7a81\u7136\u53d1\u73b0\u4e2a\u5f88\u6709\u610f\u601d\u7684\u5730\u65b9\u3002<\/p>\n\n\n\n
\u5982\u679c\u4f60\u540c\u65f6\u8dd1\u591a\u4e2atest\uff0c\u7531\u4e8e\u5199\u5165\u7684\u90fd\u662f\u540c\u4e00\u4e2a\u6587\u4ef6\uff0cTest A\u548cTest B\u6700\u540e\u4f1a\u8bfb\u5230\u5bf9\u65b9\u7684\u6570\u636e\u3002\u4f46\u662f\u5355\u72ec\u8fd0\u884c\u6bcf\u4e2atest\u5355\u5143\u53c8\u4e0d\u4f1a\u51fa\u73b0\u95ee\u9898\u3002<\/p>\n\n\n\n
\u5f53\u7136\u8fd9\u5e94\u8be5\u4e0d\u7b97bug\uff0c\u6bd5\u7adf\u6211\u4eec\u8fd8\u6ca1\u5b9e\u73b0\u4e8b\u52a1\u3002<\/p>\n\n\n\n
<\/div>\n\n\n\n
\n
\u5b9e\u9a8c\u6b65\u9aa4<\/p>\n\u4f18\u5316heap file\u7684\u8fed\u4ee3\u5668<\/em><\/cite><\/blockquote>\n\n\n\n
\u533f\u540d\u51fd\u6570\u5b66\u7684\u4e0d\u591f\u7cbe\u5c31\u4f1a\u50cf\u6211\u4e00\u6837\uff0c\u4e00\u4e2a\u8fed\u4ee3\u5668\u5199\u534a\u5929\u3002<\/p>\n\n\n\n
Go<\/span><\/path><\/path><\/svg><\/span>
func<\/span> (f *HeapFile) <\/span>Iterator<\/span>(tid TransactionID) (<\/span>func<\/span>() (*Tuple, <\/span>error<\/span>), <\/span>error<\/span>) {<\/span><\/span>\n<\/span>\n\t<\/span>\/\/ TODO: some code goes here<\/span><\/span>\n\t<\/span>i<\/span> := <\/span>0<\/span><\/span>\n\t<\/span>var<\/span> <\/span>iter<\/span> <\/span>func<\/span>() (*Tuple, <\/span>error<\/span>)<\/span><\/span>\n\t<\/span><\/span>\n\t<\/span>return<\/span> <\/span>func<\/span>() (*Tuple, <\/span>error<\/span>) {<\/span><\/span>\n\t\t<\/span>for<\/span> i < f.<\/span>NumPages<\/span>() {<\/span><\/span>\n\t\t\t<\/span>pg<\/span>, <\/span>err<\/span> := f.bufPool.<\/span>GetPage<\/span>(f, i, tid, ReadPerm)<\/span><\/span>\n\t\t\t<\/span>if<\/span> err != <\/span>nil<\/span> {<\/span><\/span>\n\t\t\t\t<\/span>return<\/span> <\/span>nil<\/span>, err<\/span><\/span>\n\t\t\t}<\/span><\/span>\n\t\t\t<\/span>hp<\/span> := (*pg).(*heapPage)<\/span><\/span>\n\t\t\t<\/span>if<\/span> iter == <\/span>nil<\/span> {<\/span><\/span>\n\t\t\t\t<\/span>iter<\/span> = hp.<\/span>tupleIter<\/span>()<\/span><\/span>\n\t\t\t}<\/span><\/span>\n\t\t\t<\/span>t<\/span>, <\/span>err<\/span> := <\/span>iter<\/span>()<\/span><\/span>\n\t\t\t<\/span>if<\/span> err != <\/span>nil<\/span> {<\/span><\/span>\n\t\t\t\t<\/span>return<\/span> <\/span>nil<\/span>, err<\/span><\/span>\n\t\t\t}<\/span><\/span>\n\t\t\t<\/span>if<\/span> t != <\/span>nil<\/span> {<\/span><\/span>\n\t\t\t\t<\/span>return<\/span> t, <\/span>nil<\/span><\/span>\n\t\t\t} <\/span>else<\/span> {<\/span><\/span>\n\t\t\t\ti++<\/span><\/span>\n\t\t\t\t<\/span>iter<\/span> = <\/span>nil<\/span><\/span>\n\t\t\t}<\/span><\/span>\n\t\t}<\/span><\/span>\n\t\t<\/span>return<\/span> <\/span>nil<\/span>, <\/span>nil<\/span><\/span>\n\t}, <\/span>nil<\/span><\/span>\n}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u518drun file test\u4e00\u4e0b\uff0c\u5168pass\u3002<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u63a5\u4e0b\u6765lab1\u8fd8\u5269\u6700\u540e\u4e00\u4e2aexercise\u4e86\uff0c\u518d\u63a5\u518d\u5389\u54af\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Lab1\u5b9e\u9a8c\u8bb0\u5f55\uff1aheap_file\u548c\u4feebug<\/p>\n","protected":false},"author":1,"featured_media":4082,"comment_status":"open","ping_status":"","sticky":false,"template":"base","format":"standard","meta":{"footnotes":""},"categories":[44,33],"tags":[34],"_links":{"self":[{"href":"https:\/\/white-night.club\/index.php\/wp-json\/wp\/v2\/posts\/4009"}],"collection":[{"href":"https:\/\/white-night.club\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/white-night.club\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/white-night.club\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/white-night.club\/index.php\/wp-json\/wp\/v2\/comments?post=4009"}],"version-history":[{"count":0,"href":"https:\/\/white-night.club\/index.php\/wp-json\/wp\/v2\/posts\/4009\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/white-night.club\/index.php\/wp-json\/wp\/v2\/media\/4082"}],"wp:attachment":[{"href":"https:\/\/white-night.club\/index.php\/wp-json\/wp\/v2\/media?parent=4009"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/white-night.club\/index.php\/wp-json\/wp\/v2\/categories?post=4009"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/white-night.club\/index.php\/wp-json\/wp\/v2\/tags?post=4009"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}