{"id":3744,"date":"2020-01-15T10:45:35","date_gmt":"2020-01-15T02:45:35","guid":{"rendered":"http:\/\/www.wpadmin.cn\/blog\/?p=3744"},"modified":"2020-01-15T10:45:35","modified_gmt":"2020-01-15T02:45:35","slug":"mysql%e4%b8%adint3%e4%b8%8eint11%e6%9c%89%e4%bb%80%e4%b9%88%e5%8c%ba%e5%88%ab%e5%90%97%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.wpadmin.cn\/blog\/3744.html","title":{"rendered":"mysql\u4e2dint(3)\u4e0eint(11)\u6709\u4ec0\u4e48\u533a\u522b\u5417\uff1f"},"content":{"rendered":"<p>\u6ce8\u610f\uff1a\u8fd9\u91cc\u7684M\u4ee3\u8868\u7684\u5e76\u4e0d\u662f\u5b58\u50a8\u5728\u6570\u636e\u5e93\u4e2d\u7684\u5177\u4f53\u7684\u957f\u5ea6\uff0c\u4ee5\u524d\u603b\u662f\u4f1a\u8bef\u4ee5\u4e3aint(3)\u53ea\u80fd\u5b58\u50a83\u4e2a\u957f\u5ea6\u7684\u6570\u5b57\uff0cint(11)\u5c31\u4f1a\u5b58\u50a811\u4e2a\u957f\u5ea6\u7684\u6570\u5b57\uff0c\u8fd9\u662f\u5927\u9519\u7279\u9519\u7684\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u5176\u5b9e\u5f53\u6211\u4eec\u5728\u9009\u62e9\u4f7f\u7528int\u7684\u7c7b\u578b\u7684\u65f6\u5019\uff0c\u4e0d\u8bba\u662fint(3)\u8fd8\u662fint(11)\uff0c\u5b83\u5728\u6570\u636e\u5e93\u91cc\u9762\u5b58\u50a8\u7684\u90fd\u662f4\u4e2a\u5b57\u8282\u7684\u957f\u5ea6\uff0c\u5728\u4f7f\u7528int(3)\u7684\u65f6\u5019\u5982\u679c\u4f60\u8f93\u5165\u7684\u662f10\uff0c\u4f1a\u9ed8\u8ba4\u7ed9\u4f60\u5b58\u50a8\u4f4d010,\u4e5f\u5c31\u662f\u8bf4\u8fd9\u4e2a3\u4ee3\u8868\u7684\u662f\u9ed8\u8ba4\u7684\u4e00\u4e2a\u957f\u5ea6\uff0c\u5f53\u4f60\u4e0d\u8db33\u4f4d\u65f6\uff0c\u4f1a\u5e2e\u4f60\u4e0d\u5168\uff0c\u5f53\u4f60\u8d85\u8fc73\u4f4d\u65f6\uff0c\u5c31\u6ca1\u6709\u4efb\u4f55\u7684\u5f71\u54cd\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u524d\u5929\u7ec4\u7ba1\u95ee\u6211 int(10)\u4e0eint(11)\u6709\u4ec0\u4e48\u533a\u522b\uff0c\u5f53\u65f6\u89c9\u5f97\u5c31\u662f\u957f\u5ea6\u7684\u533a\u522b\u5427\uff0c\u73b0\u5728\u770b\uff0c\u4ed6\u4eec\u4e4b\u95f4\u9664\u4e86\u5728\u5b58\u50a8\u7684\u65f6\u5019\u7a0d\u5fae\u6709\u70b9\u533a\u522b\u5916\uff0c\u5728\u6211\u4eec\u4f7f\u7528\u7684\u65f6\u5019\u662f\u6ca1\u6709\u4efb\u4f55\u533a\u522b\u7684\u3002int(10)\u4e5f\u53ef\u4ee5\u4ee3\u88682147483647\u8fd9\u4e2a\u503cint(11)\u4e5f\u53ef\u4ee5\u4ee3\u8868\u3002<\/p>\n<p>\u8981\u67e5\u770b\u51fa\u4e0d\u540c\u6548\u679c\u8bb0\u5f97\u5728\u521b\u5efa\u7c7b\u578b\u7684\u65f6\u5019\u52a0 zerofill\u8fd9\u4e2a\u503c\uff0c\u8868\u793a\u75280\u586b\u5145\uff0c\u5426\u5219\u770b\u4e0d\u51fa\u6548\u679c\u7684\u3002<\/p>\n<p>\u6211\u4eec\u901a\u5e38\u5728\u521b\u5efa\u6570\u636e\u5e93\u7684\u65f6\u5019\u90fd\u4e0d\u4f1a\u52a0\u5165\u8fd9\u4e2a\u9009\u9879\uff0c\u6240\u4ee5\u53ef\u4ee5\u8bf4\u4ed6\u4eec\u4e4b\u95f4\u662f\u6ca1\u6709\u533a\u522b\u7684\u3002<\/p>\n<p>That which didn&#8217;t kill me makes me stronger<\/p>\n<p>&nbsp;<\/p>\n<p>\u58f0\u660e\u5b57\u6bb5\u662fint\u7c7b\u578b\u7684\u90a3\u4e00\u523b\u8d77\uff0cint\u5c31\u662f\u5360\u56db\u4e2a\u5b57\u8282\uff0c\u4e00\u4e2a\u5b57\u82828\u4f4d\uff0c\u4e5f\u5c31\u662f4*8=32\uff0c\u53ef\u4ee5\u8868\u793a\u7684\u6570\u5b57\u4e2a\u6570\u662f2\u768432\u6b21\u65b9(2^32\u00a0=\u00a04 294 967 296\u4e2a\u6570\u5b57)\u3002<\/p>\n<p>4 294 967 296\u4e2a\u6570\u5b57\u4e5f\u5c31\u662f0~4 294 967 295\uff0c\u5f53\u7136\u5982\u679c\u533a\u5206\u6b63\u8d1f\u53f7\u7684\u8bdd\u6240\u5b58\u7684\u6570\u5b57\u4f1a\u6bd4\u8f83\u5c0f\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.wpadmin.cn\/blog\/wp-content\/uploads\/2020\/01\/0f3f34f38db55614723a2ceed9334964.png\" alt=\"\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>\u6765\u770b\u4e0b\u9762\u7684\u56fe\u7247<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.wpadmin.cn\/blog\/wp-content\/uploads\/2020\/01\/32393dea500582344062da62637c1c86.png\" alt=\"\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6ce8\u610f\uff1a\u8fd9\u91cc\u7684M\u4ee3\u8868\u7684\u5e76\u4e0d\u662f\u5b58\u50a8\u5728\u6570\u636e\u5e93\u4e2d\u7684\u5177\u4f53\u7684\u957f\u5ea6\uff0c\u4ee5\u524d\u603b\u662f\u4f1a\u8bef\u4ee5\u4e3aint(3)\u53ea\u80fd\u5b58\u50a83\u4e2a\u957f\u5ea6\u7684\u6570\u5b57\uff0cint(11)\u5c31\u4f1a\u5b58\u50a811\u4e2a\u957f\u5ea6\u7684\u6570\u5b57\uff0c\u8fd9\u662f\u5927\u9519\u7279\u9519\u7684&#8230; 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