{"id":380,"date":"2020-12-05T03:54:45","date_gmt":"2020-12-04T19:54:45","guid":{"rendered":"http:\/\/moyisuiying.com\/?p=380"},"modified":"2020-12-10T14:23:59","modified_gmt":"2020-12-10T06:23:59","slug":"mysql%e5%ad%a6%e4%b9%a0%e4%b8%8e%e5%ae%9e%e9%aa%8c%ef%bc%88%e5%85%ab%ef%bc%89-%e5%ad%98%e5%82%a8%e8%bf%87%e7%a8%8b%e5%ae%9e%e9%aa%8c","status":"publish","type":"post","link":"http:\/\/moyisuiying.com\/index.php\/experiment\/mysqlexperiment\/380.html","title":{"rendered":"MYSQL\u5b66\u4e60\u4e0e\u5b9e\u9a8c\uff08\u516b\uff09\u2014\u2014\u5b58\u50a8\u8fc7\u7a0b\u5b9e\u9a8c"},"content":{"rendered":"\n<h2>8.\u5b58\u50a8\u8fc7\u7a0b\u5b9e\u9a8c<\/h2>\n\n\n\n<h3>8.1\u5b58\u50a8\u8fc7\u7a0b\u5b9a\u4e49<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>\u5b58\u50a8\u8fc7\u7a0b\u662f\u4e00\u7ec4\u4e3a\u4e86\u5b8c\u6210\u7279\u5b9a\u529f\u80fd\u7684 SQL 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&lt;\u8fc7\u7a0b\u4f53&gt;<br>[\u8fc7\u7a0b\u53c2\u6570[,\u2026] ] \u683c\u5f0f<br>[ IN | OUT | INOUT ] &lt;\u53c2\u6570\u540d&gt; &lt;\u7c7b\u578b&gt;<\/p><\/blockquote>\n\n\n\n<p>\u8bed\u6cd5\u8bf4\u660e\u5982\u4e0b\uff1a<\/p>\n\n\n\n<h5>1) \u8fc7\u7a0b\u540d<\/h5>\n\n\n\n<p>\u200b \u5b58\u50a8\u8fc7\u7a0b\u7684\u540d\u79f0\uff0c\u9ed8\u8ba4\u5728\u5f53\u524d\u6570\u636e\u5e93\u4e2d\u521b\u5efa\u3002\u82e5\u9700\u8981\u5728\u7279\u5b9a\u6570\u636e\u5e93\u4e2d\u521b\u5efa\u5b58\u50a8\u8fc7\u7a0b\uff0c\u5219\u8981\u5728\u540d\u79f0\u524d\u9762\u52a0\u4e0a\u6570\u636e\u5e93\u7684\u540d\u79f0\uff0c\u5373 db_name.sp_name\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u540d\u79f0\u5e94\u5f53\u5c3d\u91cf\u907f\u514d\u9009\u53d6\u4e0e MySQL \u5185\u7f6e\u51fd\u6570\u76f8\u540c\u7684\u540d\u79f0\uff0c\u5426\u5219\u4f1a\u53d1\u751f\u9519\u8bef\u3002<\/p>\n\n\n\n<h5>2) \u8fc7\u7a0b\u53c2\u6570<\/h5>\n\n\n\n<p>\u200b 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\u5b58\u50a8\u8fc7\u7a0b\u7684\u4e3b\u4f53\u90e8\u5206\uff0c\u4e5f\u79f0\u4e3a\u5b58\u50a8\u8fc7\u7a0b\u4f53\uff0c\u5305\u542b\u5728\u8fc7\u7a0b\u8c03\u7528\u7684\u65f6\u5019\u5fc5\u987b\u6267\u884c\u7684 SQL \u8bed\u53e5\u3002\u8fd9\u4e2a\u90e8\u5206\u4ee5\u5173\u952e\u5b57 <strong>BEGIN<\/strong> \u5f00\u59cb\uff0c\u4ee5\u5173\u952e\u5b57 <strong>END<\/strong> \u7ed3\u675f\u3002\u82e5\u5b58\u50a8\u8fc7\u7a0b\u4f53\u4e2d\u53ea\u6709\u4e00\u6761 SQL \u8bed\u53e5\uff0c\u5219\u53ef\u4ee5\u7701\u7565 BEGIN-END \u6807\u5fd7\u3002<\/p>\n\n\n\n<p>\u200b \u5728\u5b58\u50a8\u8fc7\u7a0b\u7684\u521b\u5efa\u4e2d\uff0c\u7ecf\u5e38\u4f1a\u7528\u5230\u4e00\u4e2a\u5341\u5206\u91cd\u8981\u7684 MySQL \u547d\u4ee4\uff0c\u5373 DELIMITER \u547d\u4ee4\uff0c\u7279\u522b\u662f\u5bf9\u4e8e\u901a\u8fc7\u547d\u4ee4\u884c\u7684\u65b9\u5f0f\u6765\u64cd\u4f5c MySQL \u6570\u636e\u5e93\u7684\u4f7f\u7528\u8005\uff0c\u66f4\u662f\u8981\u5b66\u4f1a\u4f7f\u7528\u8be5\u547d\u4ee4\u3002<\/p>\n\n\n\n<p>\u200b <strong>\u6ce8\u610f<\/strong>\uff1a\u5728 MySQL \u4e2d\uff0c\u670d\u52a1\u5668\u5904\u7406 SQL \u8bed\u53e5\u9ed8\u8ba4\u662f\u4ee5\u5206\u53f7\u4f5c\u4e3a\u8bed\u53e5\u7ed3\u675f\u6807\u5fd7\u7684\u3002\u7136\u800c\uff0c\u5728\u521b\u5efa\u5b58\u50a8\u8fc7\u7a0b\u65f6\uff0c\u5b58\u50a8\u8fc7\u7a0b\u4f53\u53ef\u80fd\u5305\u542b\u6709\u591a\u6761 SQL \u8bed\u53e5\uff0c\u8fd9\u4e9b SQL \u8bed\u53e5\u5982\u679c\u4ecd\u4ee5\u5206\u53f7\u4f5c\u4e3a\u8bed\u53e5\u7ed3\u675f\u7b26\uff0c\u90a3\u4e48 MySQL \u670d\u52a1\u5668\u5728\u5904\u7406\u65f6\u4f1a\u4ee5\u9047\u5230\u7684\u7b2c\u4e00\u6761 SQL \u8bed\u53e5\u7ed3\u5c3e\u5904\u7684\u5206\u53f7\u4f5c\u4e3a\u6574\u4e2a\u7a0b\u5e8f\u7684\u7ed3\u675f\u7b26\uff0c\u800c\u4e0d\u518d\u53bb\u5904\u7406\u5b58\u50a8\u8fc7\u7a0b\u4f53\u4e2d\u540e\u9762\u7684 SQL \u8bed\u53e5\uff0c\u8fd9\u6837\u663e\u7136\u4e0d\u884c\u3002<\/p>\n\n\n\n<p>\u4e3a\u89e3\u51b3\u4ee5\u4e0a\u95ee\u9898\uff0c\u901a\u5e38\u4f7f\u7528 <strong>DELIMITER<\/strong> \u547d\u4ee4\u5c06\u7ed3\u675f\u547d\u4ee4\u4fee\u6539\u4e3a\u5176\u4ed6\u5b57\u7b26\u3002\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>DELIMITER $$<\/code><\/pre>\n\n\n\n<p>\u8bed\u6cd5\u8bf4\u660e\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ul><li>$$ \u662f\u7528\u6237\u5b9a\u4e49\u7684\u7ed3\u675f\u7b26\uff0c\u901a\u5e38\u8fd9\u4e2a\u7b26\u53f7\u53ef\u4ee5\u662f\u4e00\u4e9b\u7279\u6b8a\u7684\u7b26\u53f7\uff0c\u5982\u4e24\u4e2a\u201c?\u201d\u6216\u4e24\u4e2a\u201c\uffe5\u201d\u7b49\u3002<\/li><li>\u5f53\u4f7f\u7528 DELIMITER \u547d\u4ee4\u65f6\uff0c\u5e94\u8be5\u907f\u514d\u4f7f\u7528\u53cd\u659c\u6760\u201c\\\u201d\u5b57\u7b26\uff0c\u56e0\u4e3a\u5b83\u662f MySQL \u7684\u8f6c\u4e49\u5b57\u7b26\u3002<\/li><\/ul>\n\n\n\n<p>\u5728 MySQL \u547d\u4ee4\u884c\u5ba2\u6237\u7aef\u8f93\u5165\u5982\u4e0b SQL \u8bed\u53e5\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>mysql > DELIMITER ??<\/code><\/pre>\n\n\n\n<p>\u6210\u529f\u6267\u884c\u8fd9\u6761 SQL \u8bed\u53e5\u540e\uff0c\u4efb\u4f55\u547d\u4ee4\u3001\u8bed\u53e5\u6216\u7a0b\u5e8f\u7684\u7ed3\u675f\u6807\u5fd7\u5c31\u6362\u4e3a\u4e24\u4e2a\u95ee\u53f7\u201c??\u201d\u4e86\u3002<\/p>\n\n\n\n<p>\u82e5\u5e0c\u671b\u6362\u56de\u9ed8\u8ba4\u7684\u5206\u53f7\u201c;\u201d\u4f5c\u4e3a\u7ed3\u675f\u6807\u5fd7\uff0c\u5219\u5728 MySQL \u547d\u4ee4\u884c\u5ba2\u6237\u7aef\u8f93\u5165\u4e0b\u5217\u8bed\u53e5\u5373\u53ef\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>mysql > DELIMITER ;<\/code><\/pre>\n\n\n\n<p>\u6ce8\u610f\uff1aDELIMITER \u548c\u5206\u53f7\u201c;\u201d\u4e4b\u95f4\u4e00\u5b9a\u8981\u6709\u4e00\u4e2a\u7a7a\u683c\u3002\u5728\u521b\u5efa\u5b58\u50a8\u8fc7\u7a0b\u65f6\uff0c\u5fc5\u987b\u5177\u6709 CREATE ROUTINE \u6743\u9650\u3002<\/p>\n\n\n\n<h4>8.3.1\u521b\u5efa\u5b58\u50a8\u8fc7\u7a0b\u4f8b\u5b50<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>mysql> delimiter $$\nmysql> create procedure show_employeeInfo()\n    -> begin\n    -> select *from employee;\n    -> end$$<\/code><\/pre>\n\n\n\n<h3>8.4\u67e5\u770b\u5b58\u50a8\u8fc7\u7a0b\u7ed3\u6784\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>show create procedure  show_employeeInfo \\G;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/2020120503422671.png?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/2020120503422671.png?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h3>8.5\u5220\u9664\u5b58\u50a8\u8fc7\u7a0b\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>DROP PROCEDURE &#91; IF EXISTS ] &lt;\u8fc7\u7a0b\u540d><\/code><\/pre>\n\n\n\n<p>\u8bed\u6cd5\u8bf4\u660e\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>\u2460\u8fc7\u7a0b\u540d\uff1a\u6307\u5b9a\u8981\u5220\u9664\u7684\u5b58\u50a8\u8fc7\u7a0b\u7684\u540d\u79f0\u3002<\/p>\n\n\n\n<p>\u2461IF EXISTS\uff1a\u6307\u5b9a\u8fd9\u4e2a\u5173\u952e\u5b57\uff0c\u7528\u4e8e\u9632\u6b62\u56e0\u5220\u9664\u4e0d\u5b58\u5728\u7684\u5b58\u50a8\u8fc7\u7a0b\u800c\u5f15\u53d1\u7684\u9519\u8bef\u3002<\/p>\n\n\n\n<p><strong>\u6ce8\u610f\uff1a<\/strong>\u5b58\u50a8\u8fc7\u7a0b\u540d\u79f0\u540e\u9762\u6ca1\u6709\u53c2\u6570\u5217\u8868\uff0c\u4e5f\u6ca1\u6709\u62ec\u53f7\uff0c\u5728\u5220\u9664\u4e4b\u524d\uff0c\u5fc5\u987b\u786e\u8ba4\u8be5\u5b58\u50a8\u8fc7\u7a0b\u6ca1\u6709\u4efb\u4f55\u4f9d\u8d56\u5173\u7cfb\uff0c\u5426\u5219\u4f1a\u5bfc\u81f4\u5176\u4ed6\u4e0e\u4e4b\u5173\u8054\u7684\u5b58\u50a8\u8fc7\u7a0b\u65e0\u6cd5\u8fd0\u884c\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205034247514.png#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205034247514.png#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h3>8.6\u4fee\u6539\u5b58\u50a8\u8fc7\u7a0b\u7684\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>ALTER PROCEDURE \u5b58\u50a8\u8fc7\u7a0b\u540d &#91; \u7279\u5f81 ... ]<\/code><\/pre>\n\n\n\n<p><code>\u7279\u5f81<\/code>\u6307\u5b9a\u4e86\u5b58\u50a8\u8fc7\u7a0b\u7684\u7279\u6027\uff0c\u53ef\u80fd\u7684\u53d6\u503c\u6709\uff1a<\/p>\n\n\n\n<p>\u2460CONTAINS SQL \u8868\u793a\u5b50\u7a0b\u5e8f\u5305\u542b SQL \u8bed\u53e5\uff0c\u4f46\u4e0d\u5305\u542b\u8bfb\u6216\u5199\u6570\u636e\u7684\u8bed\u53e5\u3002<\/p>\n\n\n\n<p>\u2461NO SQL \u8868\u793a\u5b50\u7a0b\u5e8f\u4e2d\u4e0d\u5305\u542b SQL \u8bed\u53e5\u3002<\/p>\n\n\n\n<p>\u2462READS SQL DATA \u8868\u793a\u5b50\u7a0b\u5e8f\u4e2d\u5305\u542b\u8bfb\u6570\u636e\u7684\u8bed\u53e5\u3002<\/p>\n\n\n\n<p>\u2463MODIFIES SQL DATA \u8868\u793a\u5b50\u7a0b\u5e8f\u4e2d\u5305\u542b\u5199\u6570\u636e\u7684\u8bed\u53e5\u3002<\/p>\n\n\n\n<p>\u2464SQL SECURITY { DEFINER |INVOKER } \u6307\u660e\u8c01\u6709\u6743\u9650\u6765\u6267\u884c\u3002<\/p>\n\n\n\n<p>\u2465DEFINER \u8868\u793a\u53ea\u6709\u5b9a\u4e49\u8005\u81ea\u5df1\u624d\u80fd\u591f\u6267\u884c\u3002<\/p>\n\n\n\n<p>\u2466INVOKER \u8868\u793a\u8c03\u7528\u8005\u53ef\u4ee5\u6267\u884c\u3002<\/p>\n\n\n\n<p>\u2467COMMENT 'string' \u8868\u793a\u6ce8\u91ca\u4fe1\u606f\u3002<\/p>\n\n\n\n<h3>8.7\u5b58\u50a8\u8fc7\u7a0b\u8c03\u7528<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>CALL \u5b58\u50a8\u8fc7\u7a0b\u540d(&#91;\u53c2\u6570\u2026]);<\/code><\/pre>\n\n\n\n<h3>8.8\u5b58\u50a8\u51fd\u6570<\/h3>\n\n\n\n<p>\u548c\u5b58\u50a8\u8fc7\u7a0b\u4e00\u6837\uff0c\u90fd\u662f\u5728\u6570\u636e\u5e93\u4e2d\u5b9a\u4e49\u4e00\u4e9b SQL \u8bed\u53e5\u7684\u96c6\u5408\u3002\u5b58\u50a8\u51fd\u6570\u53ef\u4ee5\u901a\u8fc7 return \u8bed\u53e5\u8fd4\u56de\u51fd\u6570\u503c\uff0c\u4e3b\u8981\u7528\u4e8e\u8ba1\u7b97\u5e76\u8fd4\u56de\u4e00\u4e2a\u503c\u3002\u800c\u5b58\u50a8\u8fc7\u7a0b\u6ca1\u6709\u76f4\u63a5\u8fd4\u56de\u503c\uff0c\u4e3b\u8981\u7528\u4e8e\u6267\u884c\u64cd\u4f5c\u3002<\/p>\n\n\n\n<h5>8.1.8.1\u8bed\u6cd5\u5728 MySQL \u4e2d\uff0c\u4f7f\u7528 <strong>CREATE FUNCTION<\/strong> \u8bed\u53e5\u6765\u521b\u5efa\u5b58\u50a8\u51fd\u6570\uff0c\u5176\u8bed\u6cd5\u5f62\u5f0f\u5982\u4e0b\uff1a<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE FUNCTION sp_name (&#91;func_parameter&#91;...]])\nRETURNS type\n&#91;characteristic ...] routine_body<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\uff1a<\/p>\n\n\n\n<p>\u2460sp_name \u53c2\u6570\uff1a\u8868\u793a\u5b58\u50a8\u51fd\u6570\u7684\u540d\u79f0\uff1b<\/p>\n\n\n\n<p>\u2461func_parameter\uff1a\u8868\u793a\u5b58\u50a8\u51fd\u6570\u7684\u53c2\u6570\u5217\u8868\uff1b<\/p>\n\n\n\n<p>\u2462RETURNS type\uff1a\u6307\u5b9a\u8fd4\u56de\u503c\u7684\u7c7b\u578b\uff1b<\/p>\n\n\n\n<p>\u2463characteristic \u53c2\u6570\uff1a\u6307\u5b9a\u5b58\u50a8\u51fd\u6570\u7684\u7279\u6027\uff0c\u8be5\u53c2\u6570\u7684\u53d6\u503c\u4e0e\u5b58\u50a8\u8fc7\u7a0b\u662f\u4e00\u6837\u7684\uff1b<\/p>\n\n\n\n<p>\u2464routine_body \u53c2\u6570\uff1a\u8868\u793a SQL \u4ee3\u7801\u7684\u5185\u5bb9\uff0c\u53ef\u4ee5\u7528 BEGIN\u2026END \u6765\u6807\u793a SQL \u4ee3\u7801\u7684\u5f00\u59cb\u548c\u7ed3\u675f\u3002<\/p>\n\n\n\n<p><strong>\u6ce8\u610f\uff1a<\/strong>\u5728\u5177\u4f53\u521b\u5efa\u51fd\u6570\u65f6\uff0c\u51fd\u6570\u540d\u4e0d\u80fd\u4e0e\u5df2\u7ecf\u5b58\u5728\u7684\u51fd\u6570\u540d\u91cd\u540d\u3002\u9664\u4e86\u4e0a\u8ff0\u8981\u6c42\u5916\uff0c\u63a8\u8350\u51fd\u6570\u540d\u547d\u540d\uff08\u6807\u8bc6\u7b26\uff09\u4e3a function_xxx \u6216\u8005 func_xxx\u3002<\/p>\n\n\n\n<p>func_parameter \u53ef\u4ee5\u7531\u591a\u4e2a\u53c2\u6570\u7ec4\u6210\uff0c\u5176\u4e2d\u6bcf\u4e2a\u53c2\u6570\u7531\u53c2\u6570\u540d\u79f0\u548c\u53c2\u6570\u7c7b\u578b\u7ec4\u6210\uff0c\u5176\u5f62\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>[IN | OUT | INOUT] param_name type;<\/p>\n\n\n\n<p>\u5176\u4e2d\uff1a<\/p>\n\n\n\n<p>\u2460IN \u8868\u793a\u8f93\u5165\u53c2\u6570\uff0cOUT \u8868\u793a\u8f93\u51fa\u53c2\u6570\uff0cINOUT \u8868\u793a\u65e2\u53ef\u4ee5\u8f93\u5165\u4e5f\u53ef\u4ee5\u8f93\u51fa\uff1b<\/p>\n\n\n\n<p>\u2461param_name \u53c2\u6570\u662f\u5b58\u50a8\u51fd\u6570\u7684\u53c2\u6570\u540d\u79f0\uff1b<\/p>\n\n\n\n<p>\u2462type \u53c2\u6570\u6307\u5b9a\u5b58\u50a8\u51fd\u6570\u7684\u53c2\u6570\u7c7b\u578b\uff0c\u8be5\u7c7b\u578b\u53ef\u4ee5\u662f MySQL \u6570\u636e\u5e93\u7684\u4efb\u610f\u6570\u636e\u7c7b\u578b\u3002<\/p>\n\n\n\n<h4>8.8.2\u4f8b\u5b50<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>Delimiter $$;\n create function real_income(employeeID_1 varchar(6),employeeID_2 varchar(6)) returns tinyint(1) begin if (select income - outcome from salary where employeeID=employeeID_1) >  (select income - outcome from salary where employeeID=employeeID_2) then return 0; else return 1;  end if ;  end$$<\/code><\/pre>\n\n\n\n<h3>8.9\u5b9a\u4e49\u53d8\u91cf<\/h3>\n\n\n\n<p>MySQL \u4e2d\u53ef\u4ee5\u4f7f\u7528 <strong>DECLARE<\/strong> \u5173\u952e\u5b57\u6765\u5b9a\u4e49\u53d8\u91cf\uff0c\u5176\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>DECLARE var_name[,\u2026] type [DEFAULT value]<\/p>\n\n\n\n<p>\u5176\u4e2d\uff1a<\/p>\n\n\n\n<ul><li>DECLARE \u5173\u952e\u5b57\u662f\u7528\u6765\u58f0\u660e\u53d8\u91cf\u7684\uff1b<\/li><li>var_name \u53c2\u6570\u662f\u53d8\u91cf\u7684\u540d\u79f0\uff0c\u8fd9\u91cc\u53ef\u4ee5\u540c\u65f6\u5b9a\u4e49\u591a\u4e2a\u53d8\u91cf\uff1b<\/li><li>type \u53c2\u6570\u7528\u6765\u6307\u5b9a\u53d8\u91cf\u7684\u7c7b\u578b\uff1b<\/li><li>DEFAULT value \u5b50\u53e5\u5c06\u53d8\u91cf\u9ed8\u8ba4\u503c\u8bbe\u7f6e\u4e3a value\uff0c\u6ca1\u6709\u4f7f\u7528 DEFAULT \u5b50\u53e5\u65f6\uff0c\u9ed8\u8ba4\u503c\u4e3a NULL\u3002<\/li><\/ul>\n\n\n\n<h4>8.9.1\u4f8b 1<\/h4>\n\n\n\n<p>\u4e0b\u9762\u5b9a\u4e49\u53d8\u91cf my_sql\uff0c\u6570\u636e\u7c7b\u578b\u4e3a INT \u7c7b\u578b\uff0c\u9ed8\u8ba4\u503c\u4e3a 10\u3002SQL \u8bed\u53e5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>DECLARE my_sql INT DEFAULT 10;<\/code><\/pre>\n\n\n\n<h4>8.9.2. \u4e3a\u53d8\u91cf\u8d4b\u503c<\/h4>\n\n\n\n<p>MySQL \u4e2d\u53ef\u4ee5\u4f7f\u7528 <strong>SET<\/strong> \u5173\u952e\u5b57\u6765\u4e3a\u53d8\u91cf\u8d4b\u503c\uff0cSET \u8bed\u53e5\u7684\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SET var_name = expr&#91;,var_name = expr]...<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\uff1a<\/p>\n\n\n\n<ul><li>SET \u5173\u952e\u5b57\u7528\u6765\u4e3a\u53d8\u91cf\u8d4b\u503c\uff1b<\/li><li>var_name \u53c2\u6570\u662f\u53d8\u91cf\u7684\u540d\u79f0\uff1b<\/li><li>expr \u53c2\u6570\u662f\u8d4b\u503c\u8868\u8fbe\u5f0f\u3002<\/li><\/ul>\n\n\n\n<p>\u6ce8\u610f\uff1a\u4e00\u4e2a SET \u8bed\u53e5\u53ef\u4ee5\u540c\u65f6\u4e3a\u591a\u4e2a\u53d8\u91cf\u8d4b\u503c\uff0c\u5404\u4e2a\u53d8\u91cf\u7684\u8d4b\u503c\u8bed\u53e5\u4e4b\u95f4\u7528\u9017\u53f7\u9694\u5f00\u3002<\/p>\n\n\n\n<h4>8.9.3\u4f8b 2<\/h4>\n\n\n\n<p>\u4e0b\u9762\u4e3a\u53d8\u91cf my_sql \u8d4b\u503c\u4e3a 30\u3002SQL \u8bed\u53e5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SET my_sql=30;<\/code><\/pre>\n\n\n\n<p>MySQL \u4e2d\u8fd8\u53ef\u4ee5\u4f7f\u7528 <strong>SELECT..INTO<\/strong> \u8bed\u53e5\u4e3a\u53d8\u91cf\u8d4b\u503c\u3002\u5176\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT col_name &#91;...] INTO var_name&#91;,...]\nFROM table_name WEHRE condition<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\uff1a<\/p>\n\n\n\n<ul><li>col_name \u53c2\u6570\u8868\u793a\u67e5\u8be2\u7684\u5b57\u6bb5\u540d\u79f0\uff1b<\/li><li>var_name \u53c2\u6570\u662f\u53d8\u91cf\u7684\u540d\u79f0\uff1b<\/li><li>table_name \u53c2\u6570\u6307\u8868\u7684\u540d\u79f0\uff1b<\/li><li>condition \u53c2\u6570\u6307\u67e5\u8be2\u6761\u4ef6\u3002<\/li><\/ul>\n\n\n\n<p>\u6ce8\u610f\uff1a\u5f53\u5c06\u67e5\u8be2\u7ed3\u679c\u8d4b\u503c\u7ed9\u53d8\u91cf\u65f6\uff0c\u8be5\u67e5\u8be2\u8bed\u53e5\u7684\u8fd4\u56de\u7ed3\u679c\u53ea\u80fd\u662f\u5355\u884c\u3002<\/p>\n\n\n\n<h3>8.10\u4f8b\u5b50<\/h3>\n\n\n\n<h4>8.10.1.\u521b\u5efa\u4e00\u4e2a\u5b58\u50a8\u8fc7\u7a0b\u5b9e\u4f8b<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>mysql> delimiter $$\n\nmysql> create procedure show_employeeInfo()\n\n  -> begin\n\n  -> select *from employee;\n\n  -> end$$\n\nQuery OK, 0 rows affected (0.49 sec)<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/2020120503474426.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/2020120503474426.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<p>\u7136\u540e\u67e5\u770b\u8fc7\u7a0b\u5b58\u50a8\u521b\u5efa\u7ed3\u6784\uff1a<br><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205034757976.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205034757976.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p><\/noscript>\n\n\n\n<p>\u6700\u540e\u8c03\u7528\u5b58\u50a8\u8fc7\u7a0b\u51fd\u6570\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205034809201.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205034809201.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>8.10.2.\u5220\u9664\u5b58\u50a8\u8fc7\u7a0b\uff1a\u4f7f\u7528DROP PROCEDURE\u8bed\u53e5\u5220\u9664\u5b58\u50a8\u8fc7\u7a0b\uff0c\u8bed\u6cd5\u683c\u5f0f\u4e3a\uff1a<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205034926104.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205034926104.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<pre class=\"wp-block-code\"><code>DROP PROCEDURE &#91;IF EXISTS] \u5b58\u50a8\u8fc7\u7a0b\u540d;<\/code><\/pre>\n\n\n\n<h4>8.10.3\u521b\u5efa\u4e00\u4e2a\u5b58\u50a8\u8fc7\u7a0b\uff0c\u8ba1\u7b97employee\u8868\u4e2d\u7684\u5458\u5de5\u4eba\u6570\uff0c\u5e76\u5b58\u50a8\u5230\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf\u4e2d\uff0c\u8c03\u7528\u5b58\u50a8\u8fc7\u7a0b\uff0c\u5e76\u67e5\u770b\u8be5\u53d8\u91cf\u7ed3\u679c\uff08\u4f7f\u7528select @variable\uff09<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code> create procedure count_employee(out count_emp int)  begin set count_emp = (select count(*) from employee) ;  end $$ <\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205035045377.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205035045377.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205035058627.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205035058627.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205035116798.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205035116798.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<p>\u8c03\u7528\u5e76\u67e5\u8be2\u7ed3\u679c\uff1a<\/p>\n\n\n\n<h4>8.10.4.\u521b\u5efa\u4e00\u4e2a\u5b58\u50a8\u8fc7\u7a0b\uff0c\u6bd4\u8f83\u4e24\u4e2a\u5458\u5de5\u7684\u5b9e\u9645\u6536\u5165\uff0c\u82e5\u524d\u8005\u6bd4\u540e\u8005\u9ad8\u5c31\u8f93\u51fa0\uff0c\u5426\u5219\u8f93\u51fa1\uff0c\u5458\u5de5\u7528\u5176\u5458\u5de5\u7f16\u53f7\u8bc6\u522b\u3002<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>Delimiter $$;\n\n create function real_income(employeeID_1 varchar(6),employeeID_2 varchar(6)) returns tinyint(1) begin if (select income - outcome from salary where employeeID=employeeID_1) >  (select income - outcome from salary where employeeID=employeeID_2) then return 0; else return 1;  end if ;  end$$<\/code><\/pre>\n\n\n\n<p>\u8fd9\u65f6\u51fa\u73b0\u62a5\u9519\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/2020120503522455.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/2020120503522455.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<p>\u8fd9\u662f\u6211\u4eec\u5f00\u542f\u4e86bin-log, \u6211\u4eec\u5c31\u5fc5\u987b\u6307\u5b9a\u6211\u4eec\u7684\u51fd\u6570\u662f\u5426\u662f<br>1 DETERMINISTIC \u4e0d\u786e\u5b9a\u7684<br>2 NO SQL \u6ca1\u6709SQl\u8bed\u53e5\uff0c\u5f53\u7136\u4e5f\u4e0d\u4f1a\u4fee\u6539\u6570\u636e<br>3 READS SQL DATA \u53ea\u662f\u8bfb\u53d6\u6570\u636e\uff0c\u5f53\u7136\u4e5f\u4e0d\u4f1a\u4fee\u6539\u6570\u636e<br>4 MODIFIES SQL DATA \u8981\u4fee\u6539\u6570\u636e<br>5 CONTAINS SQL \u5305\u542b\u4e86SQL\u8bed\u53e5<br>\u5176\u4e2d\u5728function\u91cc\u9762\uff0c\u53ea\u6709 DETERMINISTIC, NO SQL \u548c READS SQL DATA \u88ab\u652f\u6301\u3002\u5982\u679c\u6211\u4eec\u5f00\u542f\u4e86 bin-log, \u6211\u4eec\u5c31\u5fc5\u987b\u4e3a\u6211\u4eec\u7684function\u6307\u5b9a\u4e00\u4e2a\u53c2\u6570\u3002<br>\u5728MySQL\u4e2d\u521b\u5efa\u51fd\u6570\u65f6\u51fa\u73b0\u8fd9\u79cd\u9519\u8bef\u7684\u89e3\u51b3\u65b9\u6cd5\uff1a<br>set global log_bin_trust_function_creators=TRUE;<br><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205035239559.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205035239559.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p><\/noscript>\n\n\n\n<p>\u95ee\u9898\u89e3\u51b3\u3002<br>\u7136\u540e\u5f00\u59cb\u8c03\u7528\u51fd\u6570\uff1a<\/p>\n\n\n\n<p><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205035250248.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br>\u6210\u529f\u5b9e\u73b0\u9700\u8981\u7684\u529f\u80fd\u3002<\/p >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205035250248.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br>\u6210\u529f\u5b9e\u73b0\u9700\u8981\u7684\u529f\u80fd\u3002<\/p><\/noscript>\n\n\n\n<p>8.11\u8be6\u7ec6\u7684\u5b9e\u9a8c\u8d44\u6599\u4ee5\u53ca\u6307\u5bfcPPT\u8bf7\u8bbf\u95ee\u7b14\u8005GitHub\u5730\u5740\uff1a<a href=\"https:\/\/github.com\/LJF2402901363\/database_experiment.git\" target=\"_blank\"  rel=\"nofollow\" >https:\/\/github.com\/LJF2402901363\/database_experiment.git<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>8.\u5b58\u50a8\u8fc7\u7a0b\u5b9e\u9a8c 8.1\u5b58\u50a8\u8fc7\u7a0b\u5b9a\u4e49 \u5b58\u50a8\u8fc7\u7a0b\u662f\u4e00\u7ec4\u4e3a\u4e86\u5b8c\u6210\u7279\u5b9a\u529f\u80fd\u7684 SQL 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