{"id":188044,"date":"2024-11-11T19:19:20","date_gmt":"2024-11-11T11:19:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/188044\/"},"modified":"2024-11-11T19:19:21","modified_gmt":"2024-11-11T11:19:21","slug":"%e9%9b%99%e5%80%8d%e6%95%b8%e6%93%9a%e8%bc%95%e9%ac%86%e6%90%9c%ef%bc%9a%e5%a6%82%e4%bd%95%e5%90%8c%e6%99%82%e6%9f%a5%e8%a9%a2%e5%85%a9%e5%80%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%8a%e7%9a%84%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/188044\/","title":{"rendered":"\u96d9\u500d\u6578\u64da\u8f15\u9b06\u641c\uff1a\u5982\u4f55\u540c\u6642\u67e5\u8a62\u5169\u500b\u6578\u64da\u5eab\u4e0a\u7684\u6578\u64da (\u540c\u6642\u67e5\u8a62\u5169\u500b\u6578\u64da\u5eab\u4e0a\u7684\u6578\u64da)"},"content":{"rendered":"<h1 id=\"%e9%9b%99%e5%80%8d%e6%95%b8%e6%93%9a%e8%bc%95%e9%ac%86%e6%90%9c%ef%bc%9a%e5%a6%82%e4%bd%95%e5%90%8c%e6%99%82%e6%9f%a5%e8%a9%a2%e5%85%a9%e5%80%8b%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%8a%e7%9a%84%e6%95%b8-khKBRPBfRz\">\u96d9\u500d\u6578\u64da\u8f15\u9b06\u641c\uff1a\u5982\u4f55\u540c\u6642\u67e5\u8a62\u5169\u500b\u6578\u64da\u5eab\u4e0a\u7684\u6578\u64da<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u4f01\u696d\u548c\u958b\u767c\u8005\u7d93\u5e38\u9700\u8981\u5f9e\u591a\u500b\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u4fe1\u606f\u3002\u7121\u8ad6\u662f\u70ba\u4e86\u6578\u64da\u5206\u6790\u3001\u5831\u544a\u751f\u6210\uff0c\u9084\u662f\u61c9\u7528\u7a0b\u5e8f\u7684\u5373\u6642\u67e5\u8a62\uff0c\u80fd\u5920\u540c\u6642\u67e5\u8a62\u5169\u500b\u6578\u64da\u5eab\u4e0a\u7684\u6578\u64da\u90fd\u662f\u4e00\u9805\u91cd\u8981\u7684\u6280\u80fd\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u6709\u6548\u5730\u5be6\u73fe\u9019\u4e00\u76ee\u6a19\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e5%90%8c%e6%99%82%e6%9f%a5%e8%a9%a2%e5%85%a9%e5%80%8b%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9f-khKBRPBfRz\">\u70ba\u4ec0\u9ebc\u9700\u8981\u540c\u6642\u67e5\u8a62\u5169\u500b\u6578\u64da\u5eab\uff1f<\/h2>\n<p>\u540c\u6642\u67e5\u8a62\u5169\u500b\u6578\u64da\u5eab\u7684\u9700\u6c42\u4e3b\u8981\u6e90\u65bc\u4ee5\u4e0b\u5e7e\u500b\u539f\u56e0\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u6574\u5408\uff1a<\/strong>\u4f01\u696d\u53ef\u80fd\u5728\u4e0d\u540c\u7684\u6578\u64da\u5eab\u4e2d\u5b58\u5132\u4e0d\u540c\u985e\u578b\u7684\u4fe1\u606f\uff0c\u901a\u904e\u540c\u6642\u67e5\u8a62\uff0c\u53ef\u4ee5\u7372\u5f97\u66f4\u5168\u9762\u7684\u6578\u64da\u8996\u5716\u3002<\/li>\n<li><strong>\u6027\u80fd\u512a\u5316\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u5c07\u67e5\u8a62\u5206\u6563\u5230\u591a\u500b\u6578\u64da\u5eab\u4e2d\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u7279\u5225\u662f\u7576\u6578\u64da\u91cf\u9f90\u5927\u6642\u3002<\/li>\n<li><strong>\u6578\u64da\u4e00\u81f4\u6027\uff1a<\/strong>\u5728\u9032\u884c\u6578\u64da\u9077\u79fb\u6216\u6574\u5408\u6642\uff0c\u80fd\u5920\u540c\u6642\u67e5\u8a62\u5169\u500b\u6578\u64da\u5eab\u6709\u52a9\u65bc\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%be%e5%90%8c%e6%99%82%e6%9f%a5%e8%a9%a2-khKBRPBfRz\">\u5982\u4f55\u5be6\u73fe\u540c\u6642\u67e5\u8a62<\/h2>\n<p>\u5be6\u73fe\u540c\u6642\u67e5\u8a62\u7684\u65b9\u5f0f\u53d6\u6c7a\u65bc\u6240\u4f7f\u7528\u7684\u6578\u64da\u5eab\u985e\u578b\u548c\u6280\u8853\u67b6\u69cb\u3002\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u5e38\u898b\u7684\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e8%81%af%e5%90%88%e6%9f%a5%e8%a9%a2%ef%bc%88union%ef%bc%89-khKBRPBfRz\">1. \u4f7f\u7528\u806f\u5408\u67e5\u8a62\uff08UNION\uff09<\/h3>\n<p>\u5982\u679c\u5169\u500b\u6578\u64da\u5eab\u7684\u7d50\u69cb\u76f8\u4f3c\uff0c\u53ef\u4ee5\u4f7f\u7528SQL\u7684UNION\u64cd\u4f5c\u7b26\u4f86\u5408\u4f75\u67e5\u8a62\u7d50\u679c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT column1, column2 FROM database1.table1\nUNION\nSELECT column1, column2 FROM database2.table2;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u5f9e\u5169\u500b\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u76f8\u540c\u5217\u7684\u6578\u64da\uff0c\u4e26\u5c07\u7d50\u679c\u5408\u4f75\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e9%8f%88%e6%8e%a5%ef%bc%88database-link%ef%bc%89-khKBRPBfRz\">2. \u4f7f\u7528\u6578\u64da\u5eab\u93c8\u63a5\uff08Database Link\uff09<\/h3>\n<p>\u67d0\u4e9b\u6578\u64da\u5eab\u7cfb\u7d71\uff08\u5982Oracle\uff09\u652f\u6301\u6578\u64da\u5eab\u93c8\u63a5\uff0c\u5141\u8a31\u7528\u6236\u76f4\u63a5\u67e5\u8a62\u5176\u4ed6\u6578\u64da\u5eab\u4e2d\u7684\u8868\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528\u6578\u64da\u5eab\u93c8\u63a5\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM table1@database1\nJOIN table2@database2 ON table1.id = table2.id;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u53ef\u4ee5\u76f4\u63a5\u5f9e\u5169\u500b\u4e0d\u540c\u7684\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6578\u64da\uff0c\u4e26\u9032\u884c\u806f\u63a5\u64cd\u4f5c\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e6%87%89%e7%94%a8%e7%a8%8b%e5%ba%8f%e5%b1%a4%e7%9a%84%e6%9f%a5%e8%a9%a2-khKBRPBfRz\">3. \u4f7f\u7528\u61c9\u7528\u7a0b\u5e8f\u5c64\u7684\u67e5\u8a62<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5728\u61c9\u7528\u7a0b\u5e8f\u5c64\u9762\u4e0a\u5be6\u73fe\u540c\u6642\u67e5\u8a62\u3002\u9019\u610f\u5473\u8457\u5728\u61c9\u7528\u7a0b\u5e8f\u4e2d\u5206\u5225\u67e5\u8a62\u5169\u500b\u6578\u64da\u5eab\uff0c\u7136\u5f8c\u5728\u61c9\u7528\u7a0b\u5e8f\u4e2d\u5408\u4f75\u7d50\u679c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528Python\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>import mysql.connector\n\n# \u9023\u63a5\u5230\u7b2c\u4e00\u500b\u6578\u64da\u5eab\ndb1 = mysql.connector.connect(\n    host=\"localhost\",\n    user=\"user1\",\n    password=\"password1\",\n    database=\"database1\"\n)\n\n# \u9023\u63a5\u5230\u7b2c\u4e8c\u500b\u6578\u64da\u5eab\ndb2 = mysql.connector.connect(\n    host=\"localhost\",\n    user=\"user2\",\n    password=\"password2\",\n    database=\"database2\"\n)\n\ncursor1 = db1.cursor()\ncursor2 = db2.cursor()\n\ncursor1.execute(\"SELECT * FROM table1\")\ncursor2.execute(\"SELECT * FROM table2\")\n\nresults1 = cursor1.fetchall()\nresults2 = cursor2.fetchall()\n\n# \u5408\u4f75\u7d50\u679c\ncombined_results = results1 + results2\n\n# \u8f38\u51fa\u7d50\u679c\nfor result in combined_results:\n    print(result)\n\ncursor1.close()\ncursor2.close()\ndb1.close()\ndb2.close();<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-khKBRPBfRz\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u9032\u884c\u540c\u6642\u67e5\u8a62\u6642\uff0c\u958b\u767c\u8005\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li><strong>\u6027\u80fd\u8003\u91cf\uff1a<\/strong>\u540c\u6642\u67e5\u8a62\u53ef\u80fd\u6703\u589e\u52a0\u7cfb\u7d71\u8ca0\u64d4\uff0c\u7279\u5225\u662f\u5728\u6578\u64da\u91cf\u9f90\u5927\u7684\u60c5\u6cc1\u4e0b\uff0c\u56e0\u6b64\u9700\u8981\u9032\u884c\u6027\u80fd\u6e2c\u8a66\u3002<\/li>\n<li><strong>\u6578\u64da\u4e00\u81f4\u6027\uff1a<\/strong>\u78ba\u4fdd\u5728\u67e5\u8a62\u904e\u7a0b\u4e2d\u6578\u64da\u7684\u4e00\u81f4\u6027\uff0c\u7279\u5225\u662f\u5728\u9032\u884c\u6578\u64da\u66f4\u65b0\u6642\u3002<\/li>\n<li><strong>\u5b89\u5168\u6027\uff1a<\/strong>\u78ba\u4fdd\u6578\u64da\u5eab\u4e4b\u9593\u7684\u9023\u63a5\u662f\u5b89\u5168\u7684\uff0c\u4e26\u9075\u5faa\u6700\u4f73\u7684\u5b89\u5168\u5be6\u8e10\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-khKBRPBfRz\">\u7e3d\u7d50<\/h2>\n<p>\u540c\u6642\u67e5\u8a62\u5169\u500b\u6578\u64da\u5eab\u4e0a\u7684\u6578\u64da\u662f\u4e00\u9805\u91cd\u8981\u7684\u6280\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u4f01\u696d\u548c\u958b\u767c\u8005\u66f4\u597d\u5730\u6574\u5408\u548c\u5206\u6790\u6578\u64da\u3002\u7121\u8ad6\u662f\u4f7f\u7528\u806f\u5408\u67e5\u8a62\u3001\u6578\u64da\u5eab\u93c8\u63a5\u9084\u662f\u61c9\u7528\u7a0b\u5e8f\u5c64\u7684\u67e5\u8a62\u65b9\u6cd5\uff0c\u9078\u64c7\u5408\u9069\u7684\u6280\u8853\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u548c\u6578\u64da\u7684\u53ef\u7528\u6027\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u8f15\u9b06\u540c\u6642\u67e5\u8a62\u5169\u500b\u6578\u64da\u5eab\u7684\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u5be6\u73fe\u96d9\u500d\u6578\u64da\u7684\u5feb\u901f\u7372\u53d6\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-188044","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188044","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=188044"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188044\/revisions"}],"predecessor-version":[{"id":188045,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188044\/revisions\/188045"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=188044"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=188044"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=188044"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}