{"id":1533,"date":"2022-11-09T23:07:58","date_gmt":"2022-11-09T15:07:58","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1533"},"modified":"2022-11-27T12:40:58","modified_gmt":"2022-11-27T04:40:58","slug":"%e7%ac%ac10%e7%ab%a0_%e5%88%9b%e5%bb%ba%e5%92%8c%e7%ae%a1%e7%90%86%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1533","title":{"rendered":"\u6570\u636e\u5e93\u7684\u521b\u5efa\u3001\u4fee\u6539\u4e0e\u5220\u9664\u3001\u5e38\u89c1\u7684\u6570\u636e\u7c7b\u578b_\u521b\u5efa\u8868\u7684\u4e24\u79cd\u65b9\u5f0f\u3001\u4fee\u6539\u8868_\u91cd\u547d\u540d\u8868_\u5220\u9664\u8868_\u6e05\u7a7a\u8868\u3001DCL\u4e2dCOMMIT\u4e0eROLLBACK\u7684\u4f7f\u7528\u3001\u963f\u91ccMySQL\u547d\u540d\u89c4\u8303\u53caMySQL8DDL\u7684\u539f\u5b50\u5316"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code># \u7b2c10\u7ae0_\u521b\u5efa\u548c\u7ba1\u7406\u8868\r\n\r\nSELECT *\r\nFROM `order`;\r\n\r\n# 1. \u521b\u5efa\u548c\u7ba1\u7406\u6570\u636e\u5e93\r\n\r\n# 1.1 \u5982\u4f55\u521b\u5efa\u6570\u636e\u5e93\r\n#\u65b9\u5f0f1:\r\nCREATE DATABASE mytest1;    # \u521b\u5efa\u7684\u6b64\u6570\u636e\u5e93\u4f7f\u7528\u7684\u662f\u9ed8\u8ba4\u7684\u5b57\u7b26\u96c6\r\n\r\n#\u67e5\u770b\u521b\u5efa\u6570\u636e\u5e93\u7684\u7ed3\u6784\r\nSHOW CREATE DATABASE mytest1;\r\n\r\n#\u65b9\u5f0f2: \u663e\u5f0f\u4e86\u6307\u660e\u4e86\u8981\u521b\u5efa\u7684\u6570\u636e\u5e93\u7684\u5b57\u7b26\u96c6\r\nCREATE DATABASE mytest2 CHARACTER SET 'gbk';\r\n\r\n#\r\nSHOW CREATE DATABASE mytest2;\r\n\r\n#\u65b9\u5f0f3\uff08\u63a8\u8350\uff09: \u5982\u679c\u8981\u521b\u5efa\u7684\u6570\u636e\u5e93\u5df2\u7ecf\u5b58\u5728,\u5219\u521b\u5efa\u4e0d\u6210\u529f,\u4f46\u4e0d\u4f1a\u62a5\u9519\u3002\r\nCREATE DATABASE IF NOT EXISTS mytest2 CHARACTER SET 'utf8';\r\n# \u5982\u679c\u8981\u521b\u5efa\u7684\u6570\u636e\u5e93\u4e0d\u5b58\u5728,\u5219\u521b\u5efa\u6210\u529f\r\nCREATE DATABASE IF NOT EXISTS mytest3 CHARACTER SET 'utf8';\r\n\r\nSHOW DATABASES;\r\n\r\n# 1.2 \u7ba1\u7406\u6570\u636e\u5e93\r\n#\u67e5\u770b\u5f53\u524d\u8fde\u63a5\u4e2d\u7684\u6570\u636e\u5e93\u90fd\u6709\u54ea\u4e9b\r\nSHOW DATABASES;\r\n\r\n#\u5207\u6362\u6570\u636e\u5e93\r\nUSE atguigudb;\r\n\r\n#\u67e5\u770b\u5f53\u524d\u6570\u636e\u5e93\u4e2d\u4fdd\u5b58\u7684\u6570\u636e\u8868\r\nSHOW TABLES;\r\n\r\n#\u67e5\u770b\u5f53\u524d\u4f7f\u7528\u7684\u6570\u636e\u5e93\r\nSELECT DATABASE() FROM dual;\r\n\r\n#\u67e5\u770b\u6307\u5b9a\u6570\u636e\u5e93\u4e0b\u4fdd\u5b58\u7684\u6570\u636e\u8868\r\nSHOW TABLES FROM mysql;\r\n\r\n# 1.3 \u4fee\u6539\u6570\u636e\u5e93\r\n#\u66f4\u6539\u6570\u636e\u5e93\u5b57\u7b26\u96c6\r\nSHOW CREATE DATABASE mytest2;\r\n\r\nALTER DATABASE mytest2 CHARACTER SET 'utf8';\r\n\r\n# 1.4 \u5220\u9664\u6570\u636e\u5e93\r\n#\u65b9\u5f0f1\uff1a\u5982\u679c\u8981\u5220\u9664\u7684\u6570\u636e\u5e93\u5b58\u5728\uff0c\u5219\u5220\u9664\u6210\u529f\u3002\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5219\u62a5\u9519\r\nDROP DATABASE mytest1;\r\n\r\nSHOW DATABASES;\r\n\r\n#\u65b9\u5f0f2\uff1a\u63a8\u8350\u3002\u5982\u679c\u8981\u5220\u9664\u7684\u6570\u636e\u5e93\u5b58\u5728\uff0c\u5219\u5220\u9664\u6210\u529f\u3002\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5219\u9ed8\u9ed8\u7ed3\u675f\uff0c\u4e0d\u4f1a\u62a5\u9519\r\nDROP DATABASE IF EXISTS mytest1;\r\n\r\nDROP DATABASE IF EXISTS mytest2;\r\n\r\n# 2. \u5982\u4f55\u521b\u5efa\u6570\u636e\u8868\r\nUSE atguigudb;\r\n\r\nSHOW CREATE DATABASE atguigudb; #\u9ed8\u8ba4\u4f7f\u7528\u7684\u65f6utf8\r\n\r\nSHOW TABLES;\r\n#\u65b9\u5f0f1\uff1a\"\u767d\u624b\u8d77\u5bb6\"\u7684\u65b9\u5f0f\r\nCREATE TABLE IF NOT EXISTS myemp1(  #\u9700\u8981\u7528\u6237\u5177\u5907\u521b\u5efa\u8868\u7684\u6743\u9650\u3002\r\n    id INT,\r\n    emp_name VARCHAR(15),   #\u4f7f\u7528VARCHAR\u6765\u5b9a\u4e49\u5b57\u7b26\u4e32\uff0c\u5fc5\u987b\u5728\u4f7f\u7528VARCHAR\u65f6\u6307\u660e\u5176\u957f\u5ea6\u3002\r\n    hire_date DATE\r\n);\r\n#\u67e5\u770b\u8868\u7ed3\u6784\r\nDESC myemp1;\r\n#\u67e5\u770b\u521b\u5efa\u8868\u7684\u8bed\u53e5\u7ed3\u6784\r\nSHOW CREATE TABLE myemp1;   #\u5982\u679c\u521b\u5efa\u8868\u65f6\u6ca1\u6709\u6307\u660e\u4f7f\u7528\u7684\u5b57\u7b26\u96c6\uff0c\u5219\u9ed8\u8ba4\u4f7f\u7528\u8868\u6240\u5728\u7684\u6570\u636e\u5e93\u7684\u5b57\u7b26\u96c6\u3002\r\n#\u67e5\u770b\u8868\u6570\u636e\r\nSELECT * FROM myemp1;\r\n\r\n#\u65b9\u5f0f2\uff1a\u57fa\u4e8e\u73b0\u6709\u7684\u8868\uff0c\u540c\u65f6\u5bfc\u5165\u6570\u636e\r\nCREATE TABLE myemp2\r\nAS\r\n    SELECT employee_id,last_name,salary\r\nFROM employees;\r\n\r\nDESC myemp2;\r\nDESC employees;\r\n\r\nSELECT *\r\nFROM myemp2;\r\n\r\n#\u8bf4\u660e1\uff1a\u67e5\u8be2\u8bed\u53e5\u4e2d\u5b57\u6bb5\u7684\u522b\u540d\uff0c\u53ef\u4ee5\u4f5c\u4e3a\u65b0\u521b\u5efa\u7684\u8868\u7684\u5b57\u6bb5\u7684\u540d\u79f0\u3002\r\n#\u8bf4\u660e2\uff1a\u6b64\u65f6\u7684\u67e5\u8be2\u8bed\u53e5\u53ef\u4ee5\u7ed3\u6784\u6bd4\u8f83\u4e30\u5bcc\uff0c\u4f7f\u7528\u524d\u9762\u7ae0\u8282\u8bb2\u8fc7\u7684\u5404\u79cdSELECT\r\nCREATE TABLE myemp3\r\nAS\r\n    SELECT e.employee_id emp_id,e.last_name lname,d.department_name\r\nFROM employees e JOIN departments d\r\nON e.department_id = d.department_id;\r\n\r\nSELECT *\r\nFROM myemp3;\r\n\r\nDESC myemp3;\r\n\r\n#\u7ec3\u4e601\uff1a\u521b\u5efa\u4e00\u4e2a\u8868employees_copy\uff0c\u5b9e\u73b0\u5bf9employees\u8868\u7684\u590d\u5236\uff0c\u5305\u62ec\u8868\u6570\u636e\r\nCREATE TABLE employees_copy\r\nAS\r\n    SELECT *\r\nFROM employees;\r\n\r\nSELECT * FROM employees_copy;\r\n\r\n#\u7ec3\u4e602\uff1a\u521b\u5efa\u4e00\u4e2a\u8868employees_black\uff0c\u5b9e\u73b0\u5bf9employees\u8868\u7684\u590d\u5236\uff0c\u4e0d\u5305\u62ec\u8868\u6570\u636e\r\nCREATE TABLE employees_black\r\nAS\r\n    SELECT *\r\nFROM employees\r\n# WHERE department_id > 10000;\r\nWHERE 1 = 2;    #\u5c71\u65e0\u68f1\uff0c\u5929\u5730\u5408\uff0c\u4e43\u6562\u4e0e\u541b\u7edd\u3002\r\n\r\nSELECT * FROM employees_black;\r\n\r\n# 3. \u4fee\u6539\u8868    --> ALTER TABLE\r\nDESC myemp1;\r\n\r\n# 3.1 \u6dfb\u52a0\u4e00\u4e2a\u5b57\u6bb5\r\nALTER TABLE myemp1\r\nADD salary DOUBLE(10,2);    #\u9ed8\u8ba4\u6dfb\u52a0\u5230\u8868\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u5b57\u6bb5\u7684\u4f4d\u7f6e\r\n\r\nALTER TABLE myemp1\r\nADD phone_number VARCHAR(20) FIRST;\r\n\r\nALTER TABLE myemp1\r\nADD email VARCHAR(45) AFTER emp_name;\r\n\r\n# 3.2 \u4fee\u6539\u4e00\u4e2a\u5b57\u6bb5\uff1a\u6570\u636e\u7c7b\u578b\u3001\u957f\u5ea6\u3001\u9ed8\u8ba4\u503c\uff08\u7565\uff09\r\nALTER TABLE myemp1\r\nMODIFY emp_name VARCHAR(25);\r\n\r\nALTER TABLE myemp1\r\nMODIFY emp_name VARCHAR(35) DEFAULT 'aaa';\r\n\r\n# 3.3 \u91cd\u547d\u540d\u4e00\u4e2a\u5b57\u6bb5\r\nALTER TABLE myemp1\r\nCHANGE salary monthly_salary DOUBLE(10,2);\r\n\r\nALTER TABLE myemp1\r\nCHANGE email my_email VARCHAR(50);\r\n\r\n# 3.4 \u5220\u9664\u4e00\u4e2a\u5b57\u6bb5\r\nALTER TABLE myemp1\r\nDROP COLUMN my_email;\r\n\r\n# 4. \u91cd\u547d\u540d\u8868\r\n#\u65b9\u5f0f1\uff1a\r\nRENAME TABLE myemp1\r\nTO myemp11;\r\n\r\nDESC myemp11;\r\n\r\n#\u65b9\u5f0f2\uff1a\r\nALTER TABLE myemp2\r\nRENAME TO myemp12;\r\n\r\nDESC myemp12;\r\n\r\n# 5. \u5220\u9664\u8868\r\n#\u4e0d\u5149\u5c06\u8868\u7ed3\u6784\u5220\u9664\u6389\uff0c\u540c\u65f6\u8868\u4e2d\u7684\u6570\u636e\u4e5f\u5220\u9664\u6389\uff0c\u91ca\u653e\u8868\u7a7a\u95f4\r\nDROP TABLE IF EXISTS myemp2;\r\n\r\nDROP TABLE IF EXISTS myemp12;\r\n\r\n# 6. \u6e05\u7a7a\u8868\r\n\r\n#\u6e05\u7a7a\u8868\uff0c\u8868\u793a\u6e05\u7a7a\u8868\u4e2d\u7684\u6240\u6709\u6570\u636e\uff0c\u4f46\u662f\u8868\u7ed3\u6784\u4fdd\u7559\u3002\r\n\r\nSELECT * FROM employees_copy;\r\n\r\nTRUNCATE TABLE employees_copy;\r\n\r\nSELECT * FROM employees_copy;\r\n\r\nDESC employees_copy;\r\n\r\n# 7 . DCL \u4e2d COMMIT \u548c ROLLBACK\r\n# COMMIT: \u63d0\u4ea4\u6570\u636e\u3002\u4e00\u65e6\u6267\u884cCOMMIT\uff0c\u5219\u6570\u636e\u5c31\u88ab\u6c38\u4e45\u7684\u4fdd\u5b58\u5728\u4e86\u6570\u636e\u5e93\u4e2d\uff0c\u610f\u5473\u7740\u6570\u636e\u4e0d\u53ef\u4ee5\u56de\u6eda\u3002\r\n# ROLLBACK: \u56de\u6eda\u6570\u636e\u3002\u4e00\u65e6\u6267\u884cROLLBACK, \u5219\u53ef\u4ee5\u5b9e\u73b0\u6570\u636e\u7684\u56de\u6eda\u3002\u56de\u6eda\u5230\u6700\u8fd1\u7684\u4e00\u6b21COMMIT\u4e4b\u540e\u3002\r\n\r\n# 8. \u5bf9\u6bd4 TRUNCATE TABLE \u548c DELETE FROM\r\n# \u76f8\u540c\u70b9\uff1a\u90fd\u53ef\u4ee5\u5b9e\u73b0\u5bf9\u8868\u4e2d\u6240\u6709\u6570\u636e\u7684\u5220\u9664\uff0c\u540c\u65f6\u4fdd\u7559\u8868\u7ed3\u6784\u3002\r\n# \u4e0d\u540c\u70b9\uff1a\r\n#       TRUNCATE TABLE: \u4e00\u65e6\u6267\u884c\u6b64\u64cd\u4f5c\uff0c\u8868\u6570\u636e\u5168\u90e8\u6e05\u9664\u3002\u540c\u65f6\uff0c\u6570\u636e\u662f\u4e0d\u53ef\u4ee5\u56de\u6eda\u7684\u3002\r\n#       DELETE FROM: \u4e00\u65e6\u6267\u884c\u6b64\u64cd\u4f5c\uff0c\u8868\u6570\u636e\u53ef\u4ee5\u5168\u90e8\u6e05\u9664\uff08\u4e0d\u5e26WHERE\uff09\u3002\u540c\u65f6\uff0c\u6570\u636e\u662f\u53ef\u4ee5\u5b9e\u73b0\u56de\u6eda\u7684\u3002\r\n\r\n\/*\r\n 9. DDL \u548c DML \u7684\u8bf4\u660e\r\n    \u2460 DDL\u7684\u64cd\u4f5c\u4e00\u65e6\u6267\u884c\uff0c\u5c31\u4e0d\u53ef\u56de\u6eda\u3002\u6307\u4ee4SET autocommit = FALSE\u5bf9DDL\u64cd\u4f5c\u5931\u6548\u3002\uff08\u56e0\u4e3a\u5728\u6267\u884c\u5b8cDDL\r\n        \u64cd\u4f5c\u4e4b\u540e\uff0c\u4e00\u5b9a\u4f1a\u6267\u884c\u4e00\u6b21COMMIT\u3002\u800c\u6b64COMMIT\u64cd\u4f5c\u4e0d\u53d7SET autocommit = FALSE\u5f71\u54cd\u7684\u3002\uff09\r\n\r\n      DML\u7684\u64cd\u4f5c\u9ed8\u8ba4\u60c5\u51b5\uff0c\u4e00\u65e6\u6267\u884c\uff0c\u4e5f\u662f\u4e0d\u53ef\u56de\u6eda\u7684\u3002\u4f46\u662f\uff0c\u5982\u679c\u5728\u6267\u884cDML\u4e4b\u524d\uff0c\u6267\u884c\u4e86\r\n      SET autocommit = FALSE. \u5219\u6267\u884c\u7684DML\u64cd\u4f5c\u5c31\u53ef\u4ee5\u5b9e\u73b0\u56de\u6eda\u3002\r\n\r\n *\/\r\n#\u6f14\u793a\uff1aDELETE FROM\r\n#1)\r\nCOMMIT;\r\n#2)\r\nSELECT *\r\nFROM myemp3;\r\n#3)\r\nSET AUTOCOMMIT = FALSE;\r\n#4)\r\nDELETE FROM myemp3;\r\n#5)\r\nSELECT *\r\nFROM myemp3;\r\n#6)\r\nROLLBACK;\r\n#7)\r\nSELECT *\r\nFROM myemp3;\r\n\r\n#\u6f14\u793a\uff1aTRUNCATE TABLE\r\n#1)\r\nCOMMIT;\r\n#2)\r\nSELECT *\r\nFROM myemp3;\r\n#3)\r\nSET AUTOCOMMIT = FALSE;\r\n#4)\r\nTRUNCATE TABLE myemp3;\r\n#5)\r\nSELECT *\r\nFROM myemp3;\r\n#6)\r\nROLLBACK;\r\n#7)\r\nSELECT *\r\nFROM myemp3;\r\n\r\n############################\r\n#9. \u6d4b\u8bd5MySQL8.0\u7684\u65b0\u7279\u6027\uff1aDDL\u7684\u539f\u5b50\u5316\r\n\r\nCREATE DATABASE mytest;\r\n\r\nUSE mytest;\r\n\r\nCREATE TABLE book1(\r\nbook_id INT,\r\nbook_name VARCHAR(255)\r\n);\r\n\r\nSHOW TABLES;\r\n\r\nDROP TABLE book1,book2;\r\n\r\nSHOW TABLES;<\/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-1533","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\/1533"}],"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=1533"}],"version-history":[{"count":2,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1533\/revisions"}],"predecessor-version":[{"id":1535,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1533\/revisions\/1535"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1533"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1533"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}