{"id":97114,"date":"2024-10-20T15:07:16","date_gmt":"2024-10-20T07:07:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/97114\/"},"modified":"2024-10-20T15:07:17","modified_gmt":"2024-10-20T07:07:17","slug":"p%e4%b8%8bsql%e6%95%b8%e6%93%9a%e5%ba%ab%e6%93%8d%e4%bd%9c%e8%a9%b3%e8%a7%a3-jsp%e5%b0%8d%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e4%bf%ae%e6%94%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/97114\/","title":{"rendered":"P\u4e0bSQL\u6578\u64da\u5eab\u64cd\u4f5c\u8a73\u89e3 (jsp\u5c0d\u6578\u64da\u5eab\u7684\u4fee\u6539)"},"content":{"rendered":"

P\u4e0bSQL\u6578\u64da\u5eab\u64cd\u4f5c\u8a73\u89e3 (jsp\u5c0d\u6578\u64da\u5eab\u7684\u4fee\u6539)<\/h1>\n

\u5728\u73fe\u4eca\u7684\u7db2\u7d61\u74b0\u5883\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u8207\u64cd\u4f5c\u662f\u6bcf\u500b\u958b\u767c\u8005\u5fc5\u9808\u638c\u63e1\u7684\u6280\u80fd\u4e4b\u4e00\u3002\u5c24\u5176\u662f\u5728\u4f7f\u7528Java Server Pages (JSP)\u9032\u884cWeb\u958b\u767c\u6642\uff0c\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u64cd\u4f5c\u986f\u5f97\u5c24\u70ba\u91cd\u8981\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u5728JSP\u4e2d\u9032\u884cP\u4e0bSQL\u6578\u64da\u5eab\u7684\u64cd\u4f5c\uff0c\u7279\u5225\u662f\u6578\u64da\u7684\u4fee\u6539\u90e8\u5206\u3002<\/p>\n

\u4ec0\u9ebc\u662fP\u4e0bSQL?<\/h2>\n

P\u4e0bSQL\uff08Procedural SQL\uff09\u662f\u4e00\u7a2e\u64f4\u5c55\u7684SQL\u8a9e\u8a00\uff0c\u5141\u8a31\u958b\u767c\u8005\u5728\u6578\u64da\u5eab\u4e2d\u57f7\u884c\u66f4\u8907\u96dc\u7684\u64cd\u4f5c\u3002\u5b83\u652f\u6301\u8b8a\u91cf\u3001\u63a7\u5236\u7d50\u69cb\u548c\u932f\u8aa4\u8655\u7406\uff0c\u4f7f\u5f97\u6578\u64da\u5eab\u64cd\u4f5c\u66f4\u52a0\u9748\u6d3b\u548c\u5f37\u5927\u3002\u5728JSP\u4e2d\uff0c\u6211\u5011\u901a\u5e38\u4f7f\u7528JDBC\uff08Java Database Connectivity\uff09\u4f86\u9023\u63a5\u548c\u64cd\u4f5c\u6578\u64da\u5eab\u3002<\/p>\n

JSP\u8207\u6578\u64da\u5eab\u7684\u9023\u63a5<\/h2>\n

\u5728\u958b\u59cb\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\u4e4b\u524d\uff0c\u6211\u5011\u9700\u8981\u5148\u5efa\u7acb\u8207\u6578\u64da\u5eab\u7684\u9023\u63a5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728JSP\u4e2d\u4f7f\u7528JDBC\u9023\u63a5\u5230MySQL\u6578\u64da\u5eab\uff1a<\/p>\n

\n\n\n<\/code><\/pre>\n
\u6578\u64da\u7684\u4fee\u6539\u64cd\u4f5c<\/h2>\n
\u5728\u6210\u529f\u9023\u63a5\u5230\u6578\u64da\u5eab\u5f8c\uff0c\u6211\u5011\u53ef\u4ee5\u9032\u884c\u6578\u64da\u7684\u4fee\u6539\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528JSP\u9032\u884c\u6578\u64da\u66f4\u65b0\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n
1. \u6e96\u5099SQL\u8a9e\u53e5<\/h3>\n
\u9996\u5148\uff0c\u6211\u5011\u9700\u8981\u6e96\u5099\u4e00\u500bSQL\u66f4\u65b0\u8a9e\u53e5\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u7528\u6236\u8868\uff08users\uff09\uff0c\u6211\u5011\u60f3\u8981\u66f4\u65b0\u67d0\u500b\u7528\u6236\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff1a<\/p>\n
\nString sql = \"UPDATE users SET email = ? WHERE id = ?\";\n<\/code><\/pre>\n
2. \u4f7f\u7528PreparedStatement\u57f7\u884c\u66f4\u65b0<\/h3>\n
\u4f7f\u7528PreparedStatement\u53ef\u4ee5\u6709\u6548\u9632\u6b62SQL\u6ce8\u5165\u653b\u64ca\uff0c\u4e26\u63d0\u9ad8\u6027\u80fd\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u4f7f\u7528PreparedStatement\u4f86\u57f7\u884c\u66f4\u65b0\u64cd\u4f5c\u7684\u793a\u4f8b\uff1a<\/p>\n
\nPreparedStatement pstmt = null;\n\ntry {\n    pstmt = conn.prepareStatement(sql);\n    pstmt.setString(1, \"new_email@example.com\");\n    pstmt.setInt(2, 1); \/\/ \u5047\u8a2d\u6211\u5011\u8981\u66f4\u65b0ID\u70ba1\u7684\u7528\u6236\n    int rowsAffected = pstmt.executeUpdate();\n    \n    if (rowsAffected > 0) {\n        out.println(\"\u7528\u6236\u96fb\u5b50\u90f5\u4ef6\u66f4\u65b0\u6210\u529f\uff01\");\n    } else {\n        out.println(\"\u672a\u627e\u5230\u8a72\u7528\u6236\uff01\");\n    }\n} catch (SQLException e) {\n    e.printStackTrace();\n    out.println(\"\u66f4\u65b0\u5931\u6557\uff01\");\n} finally {\n    if (pstmt != null) {\n        pstmt.close();\n    }\n    if (conn != null) {\n        conn.close();\n    }\n}\n<\/code><\/pre>\n
\u932f\u8aa4\u8655\u7406<\/h2>\n
\u5728\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\u6642\uff0c\u932f\u8aa4\u8655\u7406\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u4f7f\u7528try-catch\u8a9e\u53e5\u53ef\u4ee5\u6355\u7372\u4e26\u8655\u7406SQL\u7570\u5e38\uff0c\u78ba\u4fdd\u61c9\u7528\u7a0b\u5e8f\u7684\u7a69\u5b9a\u6027\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u672c\u6587\u4ecb\u7d39\u4e86\u5982\u4f55\u5728JSP\u4e2d\u4f7f\u7528P\u4e0bSQL\u9032\u884c\u6578\u64da\u5eab\u7684\u4fee\u6539\u64cd\u4f5c\uff0c\u5305\u62ec\u5982\u4f55\u5efa\u7acb\u6578\u64da\u5eab\u9023\u63a5\u3001\u6e96\u5099SQL\u8a9e\u53e5\u3001\u4f7f\u7528PreparedStatement\u57f7\u884c\u66f4\u65b0\u4ee5\u53ca\u932f\u8aa4\u8655\u7406\u3002\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u64cd\u4f5c\u5f8c\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u6578\u64da\u5eab\uff0c\u63d0\u5347\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u548c\u5b89\u5168\u6027\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bcVPS\u3001\u9999\u6e2fVPS<\/a>\u3001\u4f3a\u670d\u5668<\/a>\u6216\u5176\u4ed6\u76f8\u95dc\u4e3b\u984c\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6df1\u5165\u63a2\u8a0eP\u4e0bSQL\u6578\u64da\u5eab\u64cd\u4f5c\uff0c\u4e86\u89e3JSP\u5982\u4f55\u6709\u6548\u4fee\u6539\u6578\u64da\u5eab\uff0c\u63d0\u5347\u958b\u767c\u6548\u7387\u8207\u6578\u64da\u7ba1\u7406\u80fd\u529b\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-97114","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/97114","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=97114"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/97114\/revisions"}],"predecessor-version":[{"id":97115,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/97114\/revisions\/97115"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=97114"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=97114"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=97114"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}