{"id":186,"date":"2017-02-26T12:41:35","date_gmt":"2017-02-26T04:41:35","guid":{"rendered":"http:\/\/fengyuwuzu.cn\/?p=186"},"modified":"2017-02-26T12:41:53","modified_gmt":"2017-02-26T04:41:53","slug":"mysql%e5%ad%97%e6%ae%b5%e7%b1%bb%e5%9e%8b%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/fengyuwuzu.cn\/?p=186","title":{"rendered":"mysql\u5b57\u6bb5\u7c7b\u578b\u8be6\u89e3"},"content":{"rendered":"

\u6b63\u786e\u5730\u5b9a\u4e49\u7684\u8868\u4e2d\u7684\u5b57\u6bb5\u5728\u6570\u636e\u5e93\u7684\u6574\u4f53\u4f18\u5316\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u6211\u4eec\u5e94\u8be5\u53ea\u4f7f\u7528\u771f\u6b63\u9700\u8981\u4f7f\u7528\u7c7b\u578b\u548c\u5b57\u6bb5\u7684\u5927\u5c0f; \u5982\u679c\u77e5\u9053\u53ea\u4f7f\u75282\u4e2a\u5b57\u7b26\uff0c\u5c31\u4e0d\u4f7f\u752810\u4e2a\u5b57\u7b26\u5bbd\u5b9a\u4e49\u4e00\u4e2a\u5b57\u6bb5\u3002\u8fd9\u4e9b\u7c7b\u578b\u7684\u5b57\u6bb5(\u6216\u5217)\uff0c\u4e5f\u88ab\u79f0\u4e3a\u6570\u636e\u7c7b\u578b\uff0c\u6570\u636e\u5b58\u50a8\u8fd9\u4e9b\u5b57\u6bb5\u4e4b\u4e2d\u3002<\/p>\n

mysql\u4f7f\u7528\u8bb8\u591a\u4e0d\u540c\u7684\u6570\u636e\u7c7b\u578b\uff0c\u603b\u4f53\u4e0a\u5206\u4e3a\u4e09\u7c7b\uff1a\u6570\u5b57\uff0c\u65e5\u671f\uff0c\u65f6\u95f4\u548c\u5b57\u7b26\u4e32\u7c7b\u578b\u3002<\/p>\n

\u6570\u5b57\u6570\u636e\u7c7b\u578b<\/h3>\n

mysql\u4f7f\u7528\u6240\u6709\u6807\u51c6\u7684ansi sql\u6570\u5b57\u6570\u636e\u7c7b\u578b\uff0c\u6240\u4ee5\uff0c\u5982\u679c\u5728\u5b66\u4e60mysql\u4e4b\u524d\uff0c\u6709\u63a5\u89e6\u8fc7\u5176\u5b83\u4e0d\u540c\u7684\u6570\u636e\u5e93\u7cfb\u7edf\uff0c\u90a3\u4e48\u8fd9\u4e9b\u5b9a\u4e49\u770b\u8d77\u6765\u5f88\u719f\u6089\u3002\u4e0b\u9762\u5217\u51fa\u4e86\u5e38\u89c1\u7684\u6570\u5b57\u6570\u636e\u7c7b\u578b\u53ca\u5176\u8bf4\u660e\uff1a<\/p>\n

int - \u6b63\u5e38\u5927\u5c0f\u7684\u6574\u6570\uff0c\u53ef\u4ee5\u5e26\u7b26\u53f7\u3002\u5982\u679c\u662f\u6709\u7b26\u53f7\u7684\uff0c\u5b83\u5141\u8bb8\u7684\u8303\u56f4\u662f\u4ece-2147483648\u52302147483647\u3002\u5982\u679c\u662f\u65e0\u7b26\u53f7\uff0c\u5141\u8bb8\u7684\u8303\u56f4\u662f\u4ece0\u52304294967295\u3002 \u53ef\u4ee5\u6307\u5b9a\u591a\u8fbe11\u4f4d\u7684\u5bbd\u5ea6\u3002<\/p>\n

tinyint - \u4e00\u4e2a\u975e\u5e38\u5c0f\u7684\u6574\u6570\uff0c\u53ef\u4ee5\u5e26\u7b26\u53f7\u3002\u5982\u679c\u662f\u6709\u7b26\u53f7\uff0c\u5b83\u5141\u8bb8\u7684\u8303\u56f4\u662f\u4ece-128\u5230127\u3002\u5982\u679c\u662f\u65e0\u7b26\u53f7\uff0c\u5141\u8bb8\u7684\u8303\u56f4\u662f\u4ece0\u5230255\uff0c\u53ef\u4ee5\u6307\u5b9a\u591a\u8fbe4\u4f4d\u6570\u7684\u5bbd\u5ea6\u3002<\/p>\n

smallint - \u4e00\u4e2a\u5c0f\u7684\u6574\u6570\uff0c\u53ef\u4ee5\u5e26\u7b26\u53f7\u3002\u5982\u679c\u6709\u7b26\u53f7\uff0c\u5141\u8bb8\u8303\u56f4\u4e3a-32768\u81f332767\u3002\u5982\u679c\u65e0\u7b26\u53f7\uff0c\u5141\u8bb8\u7684\u8303\u56f4\u662f\u4ece0\u523065535\uff0c\u53ef\u4ee5\u6307\u5b9a\u6700\u591a5\u4f4d\u7684\u5bbd\u5ea6\u3002<\/p>\n

mediumint - \u4e00\u4e2a\u4e2d\u7b49\u5927\u5c0f\u7684\u6574\u6570\uff0c\u53ef\u4ee5\u5e26\u7b26\u53f7\u3002\u5982\u679c\u6709\u7b26\u53f7\uff0c\u5141\u8bb8\u8303\u56f4\u4e3a-8388608\u81f38388607\u3002 \u5982\u679c\u65e0\u7b26\u53f7\uff0c\u5141\u8bb8\u7684\u8303\u56f4\u662f\u4ece0\u523016777215\uff0c\u53ef\u4ee5\u6307\u5b9a\u6700\u591a9\u4f4d\u7684\u5bbd\u5ea6\u3002<\/p>\n

bigint - \u4e00\u4e2a\u5927\u7684\u6574\u6570\uff0c\u53ef\u4ee5\u5e26\u7b26\u53f7\u3002\u5982\u679c\u6709\u7b26\u53f7\uff0c\u5141\u8bb8\u8303\u56f4\u4e3a-9223372036854775808\u52309223372036854775807\u3002\u5982\u679c\u65e0\u7b26\u53f7\uff0c\u5141\u8bb8\u7684\u8303\u56f4\u662f\u4ece0\u523018446744073709551615. \u53ef\u4ee5\u6307\u5b9a\u6700\u591a20\u4f4d\u7684\u5bbd\u5ea6\u3002<\/p>\n

float(m,d)\u00a0- \u4e0d\u80fd\u4f7f\u7528\u65e0\u7b26\u53f7\u7684\u6d6e\u70b9\u6570\u5b57\u3002\u53ef\u4ee5\u5b9a\u4e49\u663e\u793a\u957f\u5ea6(m)\u548c\u5c0f\u6570\u4f4d\u6570(d)\u3002\u8fd9\u4e0d\u662f\u5fc5\u9700\u7684\uff0c\u5e76\u4e14\u9ed8\u8ba4\u4e3a10,2\u3002\u5176\u4e2d2\u662f\u5c0f\u6570\u7684\u4f4d\u6570\uff0c10\u662f\u6570\u5b57(\u5305\u62ec\u5c0f\u6570)\u7684\u603b\u6570\u3002\u5c0f\u6570\u7cbe\u5ea6\u53ef\u4ee5\u523024\u4e2a\u6d6e\u70b9\u3002<\/p>\n

double(m,d)\u00a0- \u4e0d\u80fd\u4f7f\u7528\u65e0\u7b26\u53f7\u7684\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\u3002\u53ef\u4ee5\u5b9a\u4e49\u663e\u793a\u957f\u5ea6(m)\u548c\u5c0f\u6570\u4f4d\u6570(d)\u3002 \u8fd9\u4e0d\u662f\u5fc5\u9700\u7684\uff0c\u9ed8\u8ba4\u4e3a16,4\uff0c\u5176\u4e2d4\u662f\u5c0f\u6570\u7684\u4f4d\u6570\u3002\u5c0f\u6570\u7cbe\u5ea6\u53ef\u4ee5\u8fbe\u523053\u4f4d\u7684double\u3002 real\u662fdouble\u540c\u4e49\u8bcd\u3002<\/p>\n

decimal(m,d)\u00a0- \u975e\u538b\u7f29\u6d6e\u70b9\u6570\u4e0d\u80fd\u662f\u65e0\u7b26\u53f7\u7684\u3002\u5728\u89e3\u5305\u5c0f\u6570\uff0c\u6bcf\u4e2a\u5c0f\u6570\u5bf9\u5e94\u4e8e\u4e00\u4e2a\u5b57\u8282\u3002\u5b9a\u4e49\u663e\u793a\u957f\u5ea6(m)\u548c\u5c0f\u6570(d)\u7684\u6570\u91cf\u662f\u5fc5\u9700\u7684\u3002 numeric\u662fdecimal\u7684\u540c\u4e49\u8bcd\u3002<\/p>\n

\u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b<\/h3>\n

mysql\u7684\u65e5\u671f\u548c\u65f6\u95f4\u6570\u636e\u7c7b\u578b\u5305\u62ec\uff1a<\/p>\n

date - \u4ee5yyyy-mm-dd\u683c\u5f0f\u7684\u65e5\u671f\uff0c\u57281000-01-01\u548c9999-12-31\u4e4b\u95f4\u3002 \u4f8b\u5982\uff0c1973\u5e7412\u670830\u65e5\u5c06\u88ab\u5b58\u50a8\u4e3a1973-12-30\u3002<\/p>\n

datetime - \u65e5\u671f\u548c\u65f6\u95f4\u7ec4\u5408\u4ee5yyyy-mm-dd hh:mm:ss\u683c\u5f0f\uff0c\u57281000-01-01 00:00:00 \u52309999-12-31 23:59:59\u4e4b\u95f4\u3002\u4f8b\u5982\uff0c1973\u5e7412\u670830\u65e5\u4e0b\u53483:30\uff0c\u4f1a\u88ab\u5b58\u50a8\u4e3a1973-12-30 15:30:00\u3002<\/p>\n

timestamp - 1970\u5e741\u67081\u65e5\u5348\u591c\u4e4b\u95f4\u7684\u65f6\u95f4\u6233\uff0c\u52302037\u7684\u67d0\u4e2a\u65f6\u5019\u3002\u8fd9\u770b\u8d77\u6765\u50cf\u524d\u9762\u7684datetime\u683c\u5f0f\uff0c\u65e0\u9700\u53ea\u662f\u6570\u5b57\u4e4b\u95f4\u7684\u8fde\u5b57\u7b26; 1973\u5e7412\u670830\u65e5\u4e0b\u53483\u70b930\u5206\u5c06\u88ab\u5b58\u50a8\u4e3a19731230153000(yyyymmddhhmmss)\u3002<\/p>\n

time - \u5b58\u50a8\u65f6\u95f4\u5728hh:mm:ss\u683c\u5f0f\u3002<\/p>\n

year(m)\u00a0- \u4ee52\u4f4d\u62164\u4f4d\u6570\u5b57\u683c\u5f0f\u6765\u5b58\u50a8\u5e74\u4efd\u3002\u5982\u679c\u957f\u5ea6\u6307\u5b9a\u4e3a2(\u4f8b\u5982year(2))\uff0c\u5e74\u4efd\u5c31\u53ef\u4ee5\u4e3a1970\u81f32069(70\u301c69)\u3002\u5982\u679c\u957f\u5ea6\u6307\u5b9a\u4e3a4\uff0c\u5e74\u4efd\u8303\u56f4\u662f1901-2155\uff0c\u9ed8\u8ba4\u957f\u5ea6\u4e3a4\u3002<\/p>\n

\u5b57\u7b26\u4e32\u7c7b\u578b<\/h3>\n

\u867d\u7136\u6570\u5b57\u548c\u65e5\u671f\u7c7b\u578b\u6bd4\u8f83\u6709\u610f\u601d\uff0c\u4f46\u5b58\u50a8\u5927\u591a\u6570\u6570\u636e\u90fd\u53ef\u80fd\u662f\u5b57\u7b26\u4e32\u683c\u5f0f\u3002 \u4e0b\u9762\u5217\u51fa\u4e86\u5728mysql\u4e2d\u5e38\u89c1\u7684\u5b57\u7b26\u4e32\u6570\u636e\u7c7b\u578b\u3002<\/p>\n

char(m)\u00a0- \u56fa\u5b9a\u957f\u5ea6\u7684\u5b57\u7b26\u4e32\u662f\u4ee5\u957f\u5ea6\u4e3a1\u5230255\u4e4b\u95f4\u4e2a\u5b57\u7b26\u957f\u5ea6(\u4f8b\u5982\uff1achar(5))\uff0c\u5b58\u50a8\u53f3\u7a7a\u683c\u586b\u5145\u5230\u6307\u5b9a\u7684\u957f\u5ea6\u3002 \u9650\u5b9a\u957f\u5ea6\u4e0d\u662f\u5fc5\u9700\u7684\uff0c\u5b83\u4f1a\u9ed8\u8ba4\u4e3a1\u3002<\/p>\n

varchar(m)\u00a0- \u53ef\u53d8\u957f\u5ea6\u7684\u5b57\u7b26\u4e32\u662f\u4ee5\u957f\u5ea6\u4e3a1\u5230255\u4e4b\u95f4\u5b57\u7b26\u6570(\u9ad8\u7248\u672c\u7684mysql\u8d85\u8fc7255); \u4f8b\u5982\uff1a varchar(25). \u521b\u5efavarchar\u7c7b\u578b\u5b57\u6bb5\u65f6\uff0c\u5fc5\u987b\u5b9a\u4e49\u957f\u5ea6\u3002<\/p>\n

blob or text - \u5b57\u6bb5\u7684\u6700\u5927\u957f\u5ea6\u662f65535\u4e2a\u5b57\u7b26\u3002 blob\u662f\u201c\u4e8c\u8fdb\u5236\u5927\u5bf9\u8c61\u201d\uff0c\u5e76\u7528\u6765\u5b58\u50a8\u5927\u7684\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u5982\u56fe\u50cf\u6216\u5176\u4ed6\u7c7b\u578b\u7684\u6587\u4ef6\u3002\u5b9a\u4e49\u4e3atext\u6587\u672c\u5b57\u6bb5\u8fd8\u6301\u6709\u5927\u91cf\u7684\u6570\u636e; \u4e24\u8005\u4e4b\u95f4\u7684\u533a\u522b\u662f\uff0c\u6392\u5e8f\u548c\u6bd4\u8f83\u4e0a\u5b58\u50a8\u7684\u6570\u636e\uff0cblob\u5927\u5c0f\u5199\u654f\u611f\uff0c\u800ctext\u5b57\u6bb5\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u3002\u4e0d\u7528\u6307\u5b9ablob\u6216text\u7684\u957f\u5ea6\u3002<\/p>\n

tinyblob \u6216 tinytext - bolb\u6216text\u5217\u7528255\u4e2a\u5b57\u7b26\u7684\u6700\u5927\u957f\u5ea6\u3002\u4e0d\u6307\u5b9atingbolb\u6216tinytext\u7684\u957f\u5ea6\u3002<\/p>\n

mediumblob or mmediumtext - blob\u6216text\u5217\u5177\u670916777215\u5b57\u7b26\u7684\u6700\u5927\u957f\u5ea6\u3002\u4e0d\u6307\u5b9amediumblob\u6216mmediumtext\u7684\u957f\u5ea6\u3002<\/p>\n

longblob \u6216 longtext -\u00a0 blob\u6216text\u5217\u5177\u67094294967295\u5b57\u7b26\u7684\u6700\u5927\u957f\u5ea6\u3002\u4e0d\u6307\u5b9alongblob\u6216longtext\u7684\u957f\u5ea6\u3002<\/p>\n

enum - \u679a\u4e3e\uff0c\u8fd9\u662f\u4e00\u4e2a\u5947\u7279\u7684\u672f\u8bed\u5217\u8868\u3002\u5f53\u5b9a\u4e49\u4e00\u4e2aenum\uff0c\u8981\u521b\u5efa\u5b83\u7684\u503c\u7684\u5217\u8868\uff0c\u8fd9\u4e9b\u662f\u5fc5\u987b\u7528\u4e8e\u9009\u62e9\u7684\u9879(\u4e5f\u53ef\u4ee5\u662fnull)\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60f3\u8981\u5b57\u6bb5\u5305\u542b\u201ca\u201d\u6216 \u201cb\u201d\u6216\u201cc\u201d\uff0c\u90a3\u4e48\u53ef\u4ee5\u5b9a\u4e49\u4e3aenum\u4e3a enum(\u201ca\u201d\uff0c\u201cb\u201d\uff0c\u201cc\u201d)\u4e5f\u53ea\u6709\u8fd9\u4e9b\u503c(\u6216null)\u624d\u80fd\u7528\u6765\u586b\u5145\u8fd9\u4e2a\u5b57\u6bb5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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