{"id":1563,"date":"2022-11-13T22:47:05","date_gmt":"2022-11-13T14:47:05","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1563"},"modified":"2022-11-27T12:40:58","modified_gmt":"2022-11-27T04:40:58","slug":"%e5%ad%98%e5%82%a8%e8%bf%87%e7%a8%8b%e4%bd%bf%e7%94%a8%e8%af%b4%e6%98%8e%e3%80%81%e5%ad%98%e5%82%a8%e8%bf%87%e7%a8%8b%e7%9a%84%e5%88%9b%e5%bb%ba%e4%b8%8e%e8%b0%83%e7%94%a8%e3%80%81%e5%ad%98%e5%82%a8","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1563","title":{"rendered":"\u5b58\u50a8\u8fc7\u7a0b\u4f7f\u7528\u8bf4\u660e\u3001\u5b58\u50a8\u8fc7\u7a0b\u7684\u521b\u5efa\u4e0e\u8c03\u7528\u3001\u5b58\u50a8\u51fd\u6570\u7684\u521b\u5efa\u4e0e\u8c03\u7528\u3001\u5b58\u50a8\u8fc7\u7a0b\u4e0e\u51fd\u6570\u7684\u67e5\u770b\u4fee\u6539\u548c\u5220\u9664\u3001"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code># \u7b2c15\u7ae0_\u5b58\u50a8\u8fc7\u7a0b\u4e0e\u51fd\u6570\r\n\r\n# 0. \u51c6\u5907\u5de5\u4f5c\r\n\r\nCREATE DATABASE dbtest15;\r\n\r\nUSE dbtest15;\r\n\r\nCREATE TABLE employees\r\nAS\r\n    SELECT *\r\nFROM atguigudb.employees;\r\n\r\nCREATE TABLE department\r\nAS\r\n    SELECT *\r\nFROM atguigudb.departments;\r\n\r\nSELECT * FROM employees;\r\n\r\nSELECT * FROM department;\r\n\r\n# 1. \u521b\u5efa\u5b58\u50a8\u8fc7\u7a0b\r\n\r\n#\u7c7b\u578b1\uff1a\u65e0\u53c2\u6570\u65e0\u8fd4\u56de\u503c\r\n# \u4e3e\u4f8b1\uff1a\u521b\u5efa\u5b58\u50a8\u8fc7\u7a0bselect_all_data()\uff0c\u67e5\u770b employees \u8868\u7684\u6240\u6709\u6570\u636e\r\n\r\nDELIMITER $\r\n\r\nCREATE PROCEDURE select_all_data()\r\nBEGIN\r\n    SELECT * FROM employees;\r\nEND $\r\n\r\nDELIMITER ;\r\n\r\n# 2. \u5b58\u50a8\u8fc7\u7a0b\u7684\u8c03\u7528\r\n\r\nCALL select_all_data();\r\n\r\n# \u4e3e\u4f8b2\uff1a\u521b\u5efa\u5b58\u50a8\u8fc7\u7a0bavg_employee_salary()\uff0c\u8fd4\u56de\u6240\u6709\u5458\u5de5\u7684\u5e73\u5747\u5de5\u8d44\r\nDELIMITER \/\/\r\n\r\nCREATE PROCEDURE avg_employee_salary()\r\nBEGIN\r\n    SELECT AVG(salary) FROM employees;\r\nEND \/\/\r\n\r\nDELIMITER ;\r\n\r\n#\u8c03\u7528\r\nCALL avg_employee_salary();\r\n\r\n# \u4e3e\u4f8b3\uff1a\u521b\u5efa\u5b58\u50a8\u8fc7\u7a0bshow_max_salary()\uff0c\u7528\u6765\u67e5\u770b\u201cemps\u201d\u8868\u7684\u6700\u9ad8\u85aa\u8d44\u503c\u3002\r\n\r\nDELIMITER \/\/\r\n\r\nCREATE PROCEDURE show_max_salary()\r\nBEGIN\r\n    SELECT MAX(salary)\r\n        FROM employees;\r\nEND \/\/\r\n\r\nDELIMITER ;\r\n\r\n#\u8c03\u7528\r\nCALL show_max_salary();\r\n\r\n#\u7c7b\u578b2\uff1a\u5e26 OUT\r\n# \u4e3e\u4f8b4\uff1a\u521b\u5efa\u5b58\u50a8\u8fc7\u7a0bshow_min_salary()\uff0c\u67e5\u770b\u201cemps\u201d\u8868\u7684\u6700\u4f4e\u85aa\u8d44\u503c\u3002\u5e76\u5c06\u6700\u4f4e\u85aa\u8d44\r\n# \u901a\u8fc7OUT\u53c2\u6570\u201cms\u201d\u8f93\u51fa\r\n\r\nDESC employees;\r\n\r\nDELIMITER \/\/\r\n\r\nCREATE PROCEDURE show_min_salary(OUT ms DOUBLE)\r\nBEGIN\r\n    SELECT MIN(salary) INTO ms\r\n    FROM employees;\r\nEND \/\/\r\n\r\nDELIMITER ;\r\n\r\n#\u8c03\u7528\r\n\r\nCALL show_min_salary(@ms);\r\n\r\n#\u67e5\u770b\u53d8\u91cf\u503c\r\nSELECT @ms;\r\n\r\n#\u7c7b\u578b3\uff1a\u5e26 IN\r\n# \u4e3e\u4f8b5\uff1a\u521b\u5efa\u5b58\u50a8\u8fc7\u7a0bshow_someone_salary()\uff0c\u67e5\u770b\u201cemps\u201d\u8868\u7684\u67d0\u4e2a\u5458\u5de5\u7684\u85aa\u8d44\uff0c\r\n# \u5e76\u7528IN\u53c2\u6570empname\u8f93\u5165\u5458\u5de5\u59d3\u540d\u3002\r\n\r\nDELIMITER \/\/\r\n\r\nCREATE PROCEDURE show_someone_salary(IN empname VARCHAR(20))\r\nBEGIN\r\n    SELECT salary FROM employees\r\n        WHERE last_name = empname;\r\nEND \/\/\r\n\r\nDELIMITER ;\r\n\r\n#\u8c03\u7528\u65b9\u5f0f1\r\nCALL show_someone_salary('Abel');\r\n\r\n#\u8c03\u7528\u65b9\u5f0f2\r\nSET @empname = 'Abel';\r\nCALL show_someone_salary(@empname);\r\n\r\nSELECT * FROM employees WHERE last_name = 'Abel';\r\n\r\n#\u7c7b\u578b4\uff1a\u5e26 IN \u548c OUT\r\n# \u4e3e\u4f8b6\uff1a\u521b\u5efa\u5b58\u50a8\u8fc7\u7a0bshow_someone_salary2()\uff0c\u67e5\u770b\u201cemps\u201d\u8868\u7684\u67d0\u4e2a\u5458\u5de5\u7684\u85aa\u8d44\uff0c\r\n# \u5e76\u7528IN\u53c2\u6570empname\u8f93\u5165\u5458\u5de5\u59d3\u540d\uff0c\u7528OUT\u53c2\u6570empsalary\u8f93\u51fa\u5458\u5de5\u85aa\u8d44\u3002\r\n\r\nDELIMITER \/\/\r\n\r\nCREATE PROCEDURE show_someone_salary2(IN empname VARCHAR(20),OUT empsalary DECIMAL(10,2))\r\nBEGIN\r\n    SELECT salary INTO empsalary\r\n    FROM employees\r\n        WHERE last_name = empname;\r\nEND \/\/\r\n\r\nDELIMITER ;\r\n\r\n#\u8c03\u7528\r\nSET @empname = 'Abel';\r\nCALL show_someone_salary2(@empname,@empsalary);\r\n\r\nSELECT @empsalary;\r\n\r\n#\u7c7b\u578b5\uff1a\u5e26 INOUT\r\n# \u4e3e\u4f8b7\uff1a\u521b\u5efa\u5b58\u50a8\u8fc7\u7a0bshow_mgr_name()\uff0c\u67e5\u8be2\u67d0\u4e2a\u5458\u5de5\u9886\u5bfc\u7684\u59d3\u540d\uff0c\u5e76\u7528INOUT\u53c2\u6570\u201cempname\u201d\u8f93\u5165\u5458\u5de5\u59d3\u540d\uff0c\r\n# \u8f93\u51fa\u9886\u5bfc\u7684\u59d3\u540d\u3002\r\n\r\nDESC employees;\r\n\r\nDELIMITER $\r\n\r\nCREATE PROCEDURE show_mgr_name(INOUT empname VARCHAR(25))\r\nBEGIN\r\n\r\n    SELECT last_name INTO empname\r\n    FROM employees\r\n    WHERE employee_id = (\r\n        SELECT manager_id\r\n            FROM employees\r\n                WHERE last_name = empname\r\n        );\r\nEND $\r\n\r\nDELIMITER ;\r\n\r\n#\u8c03\u7528\r\nSET @empname := 'Abel';\r\nCALL show_mgr_name(@empname);\r\n\r\nSELECT @empname;\r\n\r\n# 2. \u5b58\u50a8\u51fd\u6570\r\n\r\n#\u4e3e\u4f8b1\uff1a\u521b\u5efa\u5b58\u50a8\u51fd\u6570\uff0c\u540d\u79f0\u4e3aemail_by_name()\uff0c\u53c2\u6570\u5b9a\u4e49\u4e3a\u7a7a\uff0c\r\n# \u8be5\u51fd\u6570\u67e5\u8be2Abel\u7684email\uff0c\u5e76\u8fd4\u56de\uff0c\u6570\u636e\u7c7b\u578b\u4e3a\u5b57\u7b26\u4e32\u578b\u3002\r\n\r\nDELIMITER \/\/\r\n\r\nCREATE FUNCTION email_by_name()\r\nRETURNS VARCHAR(25)\r\n    DETERMINISTIC\r\n    CONTAINS SQL\r\n    READS SQL DATA\r\nBEGIN\r\n   RETURN (SELECT email FROM employees WHERE last_name = 'Abel');\r\nEND \/\/\r\n\r\nDELIMITER ;\r\n\r\n#\u8c03\u7528\r\nSELECT email_by_name();\r\n\r\nSELECT email,last_name FROM employees WHERE last_name = 'Abel';\r\n\r\n#\u4e3e\u4f8b2\uff1a\u521b\u5efa\u5b58\u50a8\u51fd\u6570\uff0c\u540d\u79f0\u4e3aemail_by_id()\uff0c\u53c2\u6570\u4f20\u5165emp_id\uff0c\u8be5\u51fd\u6570\u67e5\u8be2emp_id\u7684email\uff0c\r\n# \u5e76\u8fd4\u56de\uff0c\u6570\u636e\u7c7b\u578b\u4e3a\u5b57\u7b26\u4e32\u578b\u3002\r\n\r\n#\u521b\u5efa\u51fd\u6570\u524d\u6267\u884c\u6b64\u8bed\u53e5\uff0c\u4fdd\u8bc1\u51fd\u6570\u7684\u521b\u5efa\u4f1a\u6210\u529f\r\nSET GLOBAL log_bin_trust_function_creators = 1;\r\n\r\n#\u58f0\u660e\u51fd\u6570\r\n\r\nDELIMITER \/\/\r\n\r\nCREATE FUNCTION email_by_id(emp_id INT)\r\nRETURNS VARCHAR(25)\r\n\r\nBEGIN\r\n    RETURN (SELECT email FROM employees WHERE employee_id = emp_id);\r\nEND \/\/\r\n\r\nDELIMITER ;\r\n\r\n#\u8c03\u7528\r\nSELECT email_by_id(101);\r\n\r\nSET @emp_id := 102;\r\nSELECT email_by_id(@emp_id);\r\n\r\n#\u4e3e\u4f8b3\uff1a\u521b\u5efa\u5b58\u50a8\u51fd\u6570count_by_id()\uff0c\u53c2\u6570\u4f20\u5165dept_id\uff0c\u8be5\u51fd\u6570\u67e5\u8be2dept_id\u90e8\u95e8\u7684\r\n# \u5458\u5de5\u4eba\u6570\uff0c\u5e76\u8fd4\u56de\uff0c\u6570\u636e\u7c7b\u578b\u4e3a\u6574\u578b\u3002\r\n\r\nDELIMITER \/\/\r\n\r\nCREATE FUNCTION count_by_id(dept_id INT)\r\nRETURNS INT\r\n\r\nBEGIN\r\n   RETURN (SELECT COUNT(*) FROM employees WHERE department_id = dept_id);\r\nEND \/\/\r\n\r\nDELIMITER ;\r\n\r\n#\u8c03\u7528\r\nSET @dept_id := 50;\r\nSELECT count_by_id(@dept_id);\r\n\r\n# 3. \u5b58\u50a8\u8fc7\u7a0b\u3001\u5b58\u50a8\u51fd\u6570\u7684\u67e5\u770b\r\n\r\n# \u65b9\u5f0f1. \u4f7f\u7528SHOW CREATE\u8bed\u53e5\u67e5\u770b\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\u7684\u521b\u5efa\u4fe1\u606f\r\n\r\nSHOW CREATE PROCEDURE show_mgr_name;\r\n\r\nSHOW CREATE FUNCTION count_by_id;\r\n\r\n# \u65b9\u5f0f2. \u4f7f\u7528SHOW STATUS\u8bed\u53e5\u67e5\u770b\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\u7684\u72b6\u6001\u4fe1\u606f\r\n\r\nSHOW PROCEDURE STATUS;\r\n\r\nSHOW PROCEDURE STATUS LIKE 'show_max_salary';\r\n\r\nSHOW FUNCTION STATUS LIKE 'email_by_id';\r\n\r\n# \u65b9\u5f0f3. \u4eceinformation_schema.Routines\u8868\u4e2d\u67e5\u770b\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\u7684\u4fe1\u606f\r\n\r\nSELECT * FROM information_schema.ROUTINES\r\nWHERE ROUTINE_NAME='email_by_id' AND ROUTINE_TYPE = 'FUNCTION';\r\n\r\nSELECT * FROM information_schema.ROUTINES\r\nWHERE ROUTINE_NAME='show_min_salary' AND ROUTINE_TYPE = 'FUNCTION';\r\n\r\n# 4. \u5b58\u50a8\u8fc7\u7a0b\u3001\u51fd\u6570\u7684\u4fee\u6539\r\nALTER PROCEDURE show_max_salary\r\nSQL SECURITY INVOKER\r\nCOMMENT '\u67e5\u8be2\u6700\u9ad8\u5de5\u8d44';\r\n\r\n# 5. \u5b58\u50a8\u8fc7\u7a0b\u3001\u51fd\u6570\u7684\u5220\u9664\r\n\r\nDROP FUNCTION IF EXISTS count_by_id;\r\n\r\nDROP PROCEDURE IF EXISTS show_min_salary;\r\n\r\n\r\n\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[47],"class_list":["post-1563","post","type-post","status-publish","format-standard","hentry","category-mysql-code","tag-mysql"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1563"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1563"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1563\/revisions"}],"predecessor-version":[{"id":1564,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1563\/revisions\/1564"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1563"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1563"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1563"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}