https://share.note.youdao.com/ynoteshare/mobile.html?id=5cc182642eb02bc64197788c7722baae&type=note&_time=1773814647044#/

https://share.note.youdao.com/ynoteshare/mobile.html?id=d8d6dc3589ffd9245d97bb7aa91af835&type=note&_time=1773822005577#/

https://share.note.youdao.com/ynoteshare/mobile.html?id=6b12565a83dc2b53727dc61af8fc3d93&type=note&_time=1773822873693#/

https://share.note.youdao.com/ynoteshare/mobile.html?id=0e14c4e1fa9ee6b3fda6da53fd20a04d&type=note&_time=1773822955078#/

https://share.note.youdao.com/ynoteshare/mobile.html?id=2664c6d8598d112672a2530d955a150c&type=note&_time=1773822996637#/

对象内存分配：https://share.note.youdao.com/ynoteshare/index.html?id=0e14c4e1fa9ee6b3fda6da53fd20a04d&type=note&_time=1773847770106

https://share.note.youdao.com/ynoteshare/mobile.html?id=b83414b7060c7b4e894bb7de5a419e1c&type=note&_time=1773903793488#/

mysql:

https://share.note.youdao.com/ynoteshare/index.html?id=f030268c54f18d2116837f8f3ef045bf&type=note&_time=1773934220114

https://share.note.youdao.com/ynoteshare/mobile.html?id=531993c09f7f85733d5c8eb9281444b8&type=note&_time=1774245771725#/

https://share.note.youdao.com/ynoteshare/mobile.html?id=d2e8a0ae8c9dc2a45c799b771a5899f6&type=note&_time=1774245865393#/

https://share.note.youdao.com/ynoteshare/mobile.html?id=df15aba3aa76c225090d04d0dc776dd9&type=note&_time=1774246050800#/

https://share.note.youdao.com/ynoteshare/mobile.html?id=354ae85f3519bac0581919a458278a59&type=note&_time=1774246126978#/

https://share.note.youdao.com/ynoteshare/mobile.html?id=91f18a2472ba9712d3749a6cad827d24&type=note&_time=1774246194083#/

https://share.note.youdao.com/ynoteshare/mobile.html?id=e525fe2d76ec747ba868ab7fe153b085&type=note&_time=1774246258007#/