{"id":183618,"date":"2024-11-10T06:19:19","date_gmt":"2024-11-09T22:19:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/183618\/"},"modified":"2024-11-10T06:19:20","modified_gmt":"2024-11-09T22:19:20","slug":"%e4%bd%bf%e7%94%a8c-foreach%e5%be%aa%e7%92%b0%e5%8f%96%e5%87%ba%e6%8c%87%e5%ae%9a%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e6%95%b8%e6%93%9a-c-foreach-%e5%8f%96%e6%8c%87%e5%ae%9a%e7%9a%84","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/183618\/","title":{"rendered":"\u4f7f\u7528C foreach\u5faa\u74b0\u53d6\u51fa\u6307\u5b9a\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da (c foreach \u53d6\u6307\u5b9a\u7684\u6578\u64da\u5eab)"},"content":{"rendered":"

\u4f7f\u7528C foreach\u5faa\u74b0\u53d6\u51fa\u6307\u5b9a\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da<\/h1>\n

\u5728\u73fe\u4ee3\u7684\u61c9\u7528\u7a0b\u5e8f\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u64cd\u4f5c\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u7121\u8ad6\u662f\u5f9e\u6578\u64da\u5eab\u4e2d\u8b80\u53d6\u6578\u64da\u9084\u662f\u5beb\u5165\u6578\u64da\uff0c\u958b\u767c\u8005\u90fd\u9700\u8981\u638c\u63e1\u76f8\u61c9\u7684\u6280\u8853\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528C\u8a9e\u8a00\u4e2d\u7684foreach\u5faa\u74b0\u4f86\u53d6\u51fa\u6307\u5b9a\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n

\u4ec0\u9ebc\u662fforeach\u5faa\u74b0\uff1f<\/h2>\n

foreach\u5faa\u74b0\u662f\u4e00\u7a2e\u7c21\u5316\u7684\u8fed\u4ee3\u7d50\u69cb\uff0c\u901a\u5e38\u7528\u65bc\u904d\u6b77\u96c6\u5408\u6216\u6578\u7d44\u3002\u5728C\u8a9e\u8a00\u4e2d\uff0c\u96d6\u7136\u6c92\u6709\u5167\u5efa\u7684foreach\u8a9e\u6cd5\uff0c\u4f46\u6211\u5011\u53ef\u4ee5\u901a\u904e\u5176\u4ed6\u65b9\u5f0f\u5be6\u73fe\u985e\u4f3c\u7684\u529f\u80fd\u3002\u9019\u7a2e\u5faa\u74b0\u7279\u5225\u9069\u5408\u7528\u65bc\u8655\u7406\u6578\u64da\u5eab\u67e5\u8a62\u7d50\u679c\uff0c\u56e0\u70ba\u5b83\u80fd\u5920\u7c21\u5316\u4ee3\u78bc\u4e26\u63d0\u9ad8\u53ef\u8b80\u6027\u3002<\/p>\n

\u9023\u63a5\u6578\u64da\u5eab<\/h2>\n

\u5728\u4f7f\u7528foreach\u5faa\u74b0\u4e4b\u524d\uff0c\u6211\u5011\u9996\u5148\u9700\u8981\u9023\u63a5\u5230\u6578\u64da\u5eab\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528MySQL\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728C\u8a9e\u8a00\u4e2d\u9023\u63a5\u5230\u6578\u64da\u5eab\uff1a<\/p>\n

\n#include <mysql\/mysql.h>\n\nMYSQL *conn;\nconn = mysql_init(NULL);\nif (conn == NULL) {\n    fprintf(stderr, \"mysql_init() failedn\");\n    return EXIT_FAILURE;\n}\n\nif (mysql_real_connect(conn, \"localhost\", \"user\", \"password\", \"database\", 0, NULL, 0) == NULL) {\n    fprintf(stderr, \"mysql_real_connect() failedn\");\n    mysql_close(conn);\n    return EXIT_FAILURE;\n}\n<\/code><\/pre>\n
\u57f7\u884c\u67e5\u8a62<\/h2>\n
\u9023\u63a5\u5230\u6578\u64da\u5eab\u5f8c\uff0c\u6211\u5011\u53ef\u4ee5\u57f7\u884c\u67e5\u8a62\u4ee5\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u57f7\u884c\u67e5\u8a62\u7684\u793a\u4f8b\uff1a<\/p>\n
\nif (mysql_query(conn, \"SELECT * FROM table_name\")) {\n    fprintf(stderr, \"SELECT * failed. Error: %sn\", mysql_error(conn));\n    mysql_close(conn);\n    return EXIT_FAILURE;\n}\n\nMYSQL_RES *result = mysql_store_result(conn);\nif (result == NULL) {\n    fprintf(stderr, \"mysql_store_result() failed. Error: %sn\", mysql_error(conn));\n    mysql_close(conn);\n    return EXIT_FAILURE;\n}\n<\/code><\/pre>\n
\u4f7f\u7528foreach\u5faa\u74b0\u904d\u6b77\u7d50\u679c<\/h2>\n
\u5728\u7372\u53d6\u67e5\u8a62\u7d50\u679c\u5f8c\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4e00\u500b\u5faa\u74b0\u4f86\u904d\u6b77\u9019\u4e9b\u7d50\u679c\u3002\u96d6\u7136C\u8a9e\u8a00\u6c92\u6709\u5167\u5efa\u7684foreach\uff0c\u4f46\u6211\u5011\u53ef\u4ee5\u4f7f\u7528while\u5faa\u74b0\u4f86\u6a21\u64ec\u9019\u4e00\u904e\u7a0b\uff1a<\/p>\n
\nMYSQL_ROW row;\nwhile ((row = mysql_fetch_row(result))) {\n    printf(\"Column 1: %s, Column 2: %sn\", row[0], row[1]);\n}\n<\/code><\/pre>\n
\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c\u6211\u5011\u4f7f\u7528mysql_fetch_row\u51fd\u6578\u4f86\u9010\u884c\u7372\u53d6\u6578\u64da\uff0c\u4e26\u5c07\u5176\u5b58\u5132\u5728row\u8b8a\u91cf\u4e2d\u3002\u7136\u5f8c\uff0c\u6211\u5011\u53ef\u4ee5\u901a\u904e\u7d22\u5f15\u8a2a\u554f\u6bcf\u4e00\u5217\u7684\u6578\u64da\u3002<\/p>\n
\u6e05\u7406\u8cc7\u6e90<\/h2>\n
\u5728\u5b8c\u6210\u6578\u64da\u64cd\u4f5c\u5f8c\uff0c\u8a18\u5f97\u91cb\u653e\u8cc7\u6e90\u4e26\u95dc\u9589\u6578\u64da\u5eab\u9023\u63a5\uff1a<\/p>\n
\nmysql_free_result(result);\nmysql_close(conn);\n<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u4f7f\u7528C\u8a9e\u8a00\u4e2d\u7684foreach\u5faa\u74b0\u4f86\u53d6\u51fa\u6307\u5b9a\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u96d6\u7136\u9700\u8981\u4e00\u4e9b\u984d\u5916\u7684\u6b65\u9a5f\uff0c\u4f46\u901a\u904e\u6b63\u78ba\u7684\u67e5\u8a62\u548c\u5faa\u74b0\u7d50\u69cb\uff0c\u6211\u5011\u53ef\u4ee5\u6709\u6548\u5730\u7372\u53d6\u548c\u8655\u7406\u6578\u64da\u3002\u9019\u7a2e\u65b9\u6cd5\u4e0d\u50c5\u63d0\u9ad8\u4e86\u4ee3\u78bc\u7684\u53ef\u8b80\u6027\uff0c\u9084\u80fd\u5920\u7c21\u5316\u6578\u64da\u8655\u7406\u7684\u904e\u7a0b\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u958b\u767c\u63d0\u4f9b\u7a69\u5b9a\u7684\u74b0\u5883\u548c\u512a\u8cea\u7684\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4f7f\u7528C\u8a9e\u8a00\u7684foreach\u5faa\u74b0\u8f15\u9b06\u63d0\u53d6\u6307\u5b9a\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\uff0c\u7c21\u5316\u6578\u64da\u8655\u7406\u6d41\u7a0b\uff0c\u63d0\u9ad8\u958b\u767c\u6548\u7387\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-183618","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183618","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=183618"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183618\/revisions"}],"predecessor-version":[{"id":183619,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183618\/revisions\/183619"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=183618"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=183618"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=183618"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}