{"id":10006567,"date":"2022-09-22T02:54:44","date_gmt":"2022-09-21T18:54:44","guid":{"rendered":"https:\/\/ityet.com\/?p=10006567"},"modified":"2022-09-22T02:54:44","modified_gmt":"2022-09-21T18:54:44","slug":"%e5%8f%af%e6%81%b6%ef%bc%8c%e5%8f%88%e6%98%af%e4%b8%aa%e7%ba%bf%e4%b8%8a%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006567","title":{"rendered":"\u53ef\u6076\uff0c\u53c8\u662f\u4e2a\u7ebf\u4e0a\u95ee\u9898"},"content":{"rendered":"<p>\u8fd9\u51e0\u5929\uff0c\u5728\u641e ShardingSphere\uff0c\u8fd9\u4e0d\u53c8\u6765\u4e86\u4e00\u4e2a\u95ee\u9898\u561b\uff0c\u542f\u52a8\u7684\u65f6\u5019\u62a5\u4e86\u4e00\u4e2aNPE\u51fa\u6765\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042529289\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u597d\u5728\uff0c\u8fd9\u4e2a\u95ee\u9898\u4e0d\u5f71\u54cd\u4f7f\u7528\uff0c\u53ea\u662f\u542f\u52a8\u4f1a\u62a5\u70b9\u9519\uff0c\u63a5\u4e0b\u6765\uff0c\u53c8\u662f\u8f9b\u82e6\u7684\u6392\u67e5\u8fc7\u7a0b\u3002\u76f4\u63a5\u5b9a\u4f4d\u5230\u62a5\u9519\u7684\u5730\u65b9\uff0c\u53d1\u73b0\u662fShardingSphere\u5728\u542f\u52a8\u65f6\u5019\u53bb\u52a0\u8f7d\u8868\u4e00\u4e9b\u5143\u6570\u636e\u4fe1\u606f\u62a5\u9519\uff0c\u770b\u5230\u8fd9\u4e2a\u5730\u65b9\u5c31\u5f88\u660e\u663e\u7684\u731c\u6d4b\u662f map \u53bb get \u7684\u65f6\u5019\u62a5\u9519\u4e86\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042529290\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u4e00\u901a\u5f80\u4e0a\u7ffb\u6e90\u7801\uff0c\u53d1\u73b0\u8fd9\u91cc\u5b9a\u4e49\u7684\u662f TreeMap\uff0c\u90a3\u5e94\u8be5\u6ca1\u6bdb\u75c5\u4e86\uff0c\u5c31\u662f\u4e0a\u9762 dataType \u662f\u4e2a null\uff0c\u6240\u4ee5\u62a5\u9519\u4e86\uff0c\u53ef\u662f\u6211\u8fd8\u662f\u5e74\u8f7b\u4e86\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042529291\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u95ee\u9898\u539f\u56e0\u4e0a\u9762\u6211\u4eec\u5df2\u7ecf\u5b9a\u4f4d\u5230\u95ee\u9898\u51fa\u73b0\u7684\u5730\u65b9\uff0c\u63a5\u4e0b\u6765\u5c31\u5206\u6790\u4e0b\u4e3a\u4ec0\u4e48\u4f1a\u51fa\u73b0\u8fd9\u4e2a\u95ee\u9898\u5462\uff1f\u4ece\u6e90\u7801\u770b\u5230\uff0c\u4e3b\u8981\u662f\u5728\u8fd9\u4e2a\u5730\u65b9\u53bb\u52a0\u8f7d\u6570\u636e\u5e93\u8868\u7684\u5217\u7684\u5143\u6570\u636e\u4fe1\u606f\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042529292\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u5728\u8fd9\u4e2a\u7c7b\u91cc\u53d1\u73b0\u4e86\u62fc\u63a5\u7684 SQL \u67e5\u8be2\u8bed\u53e5\uff0c\u4e3b\u8981\u662f\u53bb\u67e5 information_schema \u4e0b\u9762\u7684 columns \u8868\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042529293\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u8fd9\u65f6\u5019\u6211\u60f3\u770b\u4e0b\u8fd9\u4e2a\u5230\u5e95\u662f\u4e3a\u5565\uff0c\u4e8e\u662f\u6253\u5f00\u672c\u5730 debug \u770b\u4e86\u4e00\u4e0b\u6ca1\u6709\u4efb\u4f55\u95ee\u9898\uff0c\u7136\u540e\u53bb\u6d4b\u8bd5\u73af\u5883\u4e0a\u53d1\u73b0\u4e5f\u6ca1\u6709\u95ee\u9898\uff0c\u597d\u50cf\u53ea\u6709\u751f\u4ea7\u6709\u8fd9\u4e2a\u95ee\u9898\u3002\u8fd9\u4e2a dataTypeMap \u5c31\u662f\u5217\u7c7b\u578b\u7684\u4e00\u4e2a\u6620\u5c04\uff0c\u4f46\u662f\u672c\u5730\u6ca1\u6709\u529e\u6cd5\u91cd\u73b0\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042529294\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u672c\u5730\u6ca1\u6709\u529e\u6cd5\u7684\u8bdd\uff0c\u90a3\u5c31\u6839\u636e\u4e0a\u9762\u7684 SQL \u53bb\u751f\u4ea7\u5e93\u91cc\u770b\u4e86\u4e0b COLUMNS \u8868\u8fd9\u4e2a\u5b57\u6bb5\u6709\u5565\u95ee\u9898\uff0c\u67e5\u8be2\u4e00\u770b\uff0c\u53d1\u73b0\u4e86\u4e00\u5927\u5806\u7684 null\uff0c\u8fd8\u6709\u4e00\u4e9b\u5176\u4ed6\u7684\u4e71\u4e03\u516b\u7cdf\u7684\u7c7b\u578b\uff0c\u90a3\u770b\u6765 NPE \u7684\u539f\u56e0\u5c31\u662f\u56e0\u4e3a\u8fd9\u4e9b null \u4e86\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042529295\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u90a3\u8fd9\u4e9b null \u503c\u662f\u600e\u4e48\u6765\u7684\u5462\uff1f\u6839\u636e\u6392\u67e5\u53d1\u73b0\u90fd\u662f\u6765\u81ea TIDB \u7684\u89c6\u56fe\u751f\u6210\u7684\u3002\u672c\u5730\u548c\u6d4b\u8bd5\u6ca1\u6709\u529e\u6cd5\u91cd\u73b0\u662f\u56e0\u4e3a\u5176\u5b9e\u7528\u7684\u662f Mysql\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042529296\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u6392\u67e5\u8fd9\u4e2a\u73af\u5883\u95ee\u9898\u8fd8\u633a\u6076\u5fc3\u7684\uff0c\u56e0\u4e3a\u6ca1\u6709 TIDB \u7684\u73af\u5883\uff0c\u53ea\u80fd\u81ea\u5df1\u88c5\u4e00\u4e2a\u4e86\u53bb\u60f3\u529e\u6cd5\u91cd\u73b0\u4e00\u4e0b\u4e86\uff08\u8fc7\u7a0b\u5f88\u8d39\u65f6\u95f4\uff09\u3002\u597d\u5728 Mac \u88c5\u8fd9\u4e9b\u4e1c\u897f\u8fd8\u662f\u5f88\u65b9\u4fbf\u7684\uff0c\u5b89\u88c5\u3001\u5237\u65b0\u73af\u5883\u53d8\u91cf\u3001\u542f\u52a8\u3002\u00a01. curl &#8211;proto &#8216;=https&#8217; &#8211;tlsv1.2 -sSf <a href=\"https:\/\/link.segmentfault.com\/?enc=U4CbvMFhbWnPiR9HG%2BH6TA%3D%3D.3oztPAEbRMlmUW2ckXkHDkh0hqY%2FQS7mJnpqE8Do0tkG%2B914p5yuR23%2FwR%2B2yObe\" rel=\"nofollow\">https:\/\/tiup-mirrors.pingcap&#8230;.<\/a> | sh\u00a02. source ${your_shell_profile}\u00a03. tiup playground\u7136\u540e\u672c\u5730\u6309\u7167\u90a3\u4e2a\u5f88\u6c99\u96d5\u7684\u521b\u5efa\u89c6\u56fe\u7684\u65b9\u6cd5\u521b\u5efa\u4e2a\u89c6\u56fe\u51fa\u6765\uff0c\u518d\u672c\u5730 DEBUG \u770b\u770b\u3002\u8fdb\u6765\u4e00\u770b\uff0c\u548c\u5f00\u59cb\u60f3\u7684\u4e0d\u4e00\u6837\uff0c\u5c45\u7136\u662f\u4e2a null \u5b57\u7b26\u4e32\uff0c\u4e0d\u662f\u6211\u60f3\u8c61\u4e2d\u7684 null\uff0c\u90a3\u8fd9\u4e2a\u770b\u8d77\u6765\u4e0d\u5e94\u8be5\u4f1a\u62a5\u7a7a\u6307\u9488\u624d\u5bf9\u554a\uff1f\uff01<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042529297\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u6709\u70b9\u60f3\u4e0d\u901a\u4e3a\u5565\u8fd9\u91cc\u4f1a\u7a7a\uff0c\u7136\u540e\u6253\u5f00\u8fd9\u4e2a\u7c7b\u770b\u4e86\u4e00\u773c\u3002\u55ef\uff1f\uff1f\uff1f\u8fd9\u5c3c\u739b\uff1f\uff1f\uff1f\uff1f\uff1f\uff1f\uff1f\u96be\u9053\u662f\u62c6\u7bb1\u5bfc\u81f4\u7684\uff1f<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042529298\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u597d\u5427\uff0c\u6ca1\u9519\u3002dataTypeMap.get(dataType) \u662f null\uff0c\u62c6\u7bb1\u8c03\u7528\u7684\u5565\u6211\u4e0d\u7528\u8bf4\u4e86\u5427\uff0c\u5c31\u662f\u8fd9\u539f\u56e0\u3002\u3002\u3002\u4fee\u590d\u4f60\u8bf4\u548b\u6539\uff1f\u6709\u540c\u5b66\u8bf4\u4e86\uff0c\u90a3\u8fd8\u4e0d\u7b80\u5355\uff0c\u4f60\u662f\u4e2a\u6c99\u96d5\u5417\uff1f\u6539\u6210Integer\u4e0d\u5c31\u5b8c\u4e8b\u513f\u4e86\u3002\u55ef\uff0c\u4f60\u8bf4\u7684\u6ca1\u9519\uff0c\u6211\u5c31\u8fd9\u4e48\u6539\u4e86\u3002\u7136\u540e\uff0c\u6539\u5b8c\u4e4b\u540e\u542f\u52a8\u53c8\u662f\u4e00\u5806\u62a5\u9519\uff0c\u5230\u5904\u5b58\u5728\u8c03\u7528\u3002\u8fd9\u73a9\u610f\u513f\u4e0d\u80fd\u52a8\uff0c\u4ed6\u4eff\u4f5b\u5728\u548c\u6211\u8bf4\uff0c\u4f60\u52a8\u52a8\u8bd5\u8bd5\uff0c\u679c\u7136\u52a8\u52a8\u5c31\u901d\u4e16\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042529299\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u6587\u7ae0\u5199\u5230\u8fd9\u91cc\uff0c\u6211\u8fd8\u6ca1\u60f3\u597d\u600e\u4e48\u6539\uff0c\u5927\u6982\u6709 3 \u4e2a\u65b9\u6848\uff1a\u5b8c\u5168\u53bb\u6389 TIDB \u8fd8\u7528\u89c6\u56fe\u8fd9\u79bb\u8c31\u7684\u64cd\u4f5c\uff0c\u4ece\u6839\u6e90\u4e0a\u89e3\u51b3\u95ee\u9898\u6309\u7167\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u6539\u6210 Integer\uff0c\u5c31\u662f\u4e0d\u77e5\u9053\u8981\u6539\u591a\u5c11\u5730\u65b9\u4e0d\u53bb\u52a0\u8f7d\u89c6\u56fe\u7684\u5143\u6570\u636e\uff0c\u5c31\u53ef\u4ee5\u907f\u514d\u8fd9\u4e2a\u95ee\u9898\u4e86\uff0c\u6bd5\u7adf\u8fd9\u5e74\u5934\u8c01\u7528\u89c6\u56fe\u554a\u7ed9\u5927\u5bb6\u4e2a\u673a\u4f1a\uff0c\u53bb\u7ed9\u4ed6\u4eec\u63d0\u4e2a PR\u3002<\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000042529287\">https:\/\/segmentfault.com\/a\/1190000042529287<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u51e0\u5929\uff0c\u5728\u641e ShardingSphere\uff0c\u8fd9\u4e0d\u53c8\u6765\u4e86\u4e00\u4e2a\u95ee\u9898\u561b\uff0c\u542f\u52a8\u7684\u65f6\u5019\u62a5\u4e86\u4e00\u4e2aNPE\u51fa\u6765\u3002\u597d\u5728\uff0c\u8fd9\u4e2a\u95ee\u9898 [&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-10006567","post","type-post","status-publish","format-standard","hentry"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006567","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10006567"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006567\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10006567"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10006567"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10006567"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}