{"id":60231,"date":"2024-10-13T01:08:15","date_gmt":"2024-10-12T17:08:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60231\/"},"modified":"2024-10-13T01:08:15","modified_gmt":"2024-10-12T17:08:15","slug":"c%e4%b8%ad%e4%bd%bf%e7%94%a8foreach%e8%aa%9e%e5%8f%a5%e7%8d%b2%e5%8f%96%e4%b9%8b%e4%b8%80%e5%80%8b%e6%95%b8%e6%93%9a%e5%ba%ab-c-foreach-%e7%8d%b2%e5%8f%96%e4%b9%8b%e4%b8%80%e5%80%8b%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60231\/","title":{"rendered":"C\u4e2d\u4f7f\u7528foreach\u8a9e\u53e5\u7372\u53d6\u4e4b\u4e00\u500b\u6578\u64da\u5eab (c foreach \u7372\u53d6\u4e4b\u4e00\u500b\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"c%e4%b8%ad%e4%bd%bf%e7%94%a8foreach%e8%aa%9e%e5%8f%a5%e7%8d%b2%e5%8f%96%e4%b9%8b%e4%b8%80%e5%80%8b%e6%95%b8%e6%93%9a%e5%ba%ab-ESqfDVTvGt\">C\u4e2d\u4f7f\u7528foreach\u8a9e\u53e5\u7372\u53d6\u4e4b\u4e00\u500b\u6578\u64da\u5eab<\/h1>\n<p>\u5728C\u8a9e\u8a00\u4e2d\uff0c\u96d6\u7136\u6c92\u6709\u76f4\u63a5\u7684foreach\u8a9e\u53e5\uff0c\u4f46\u6211\u5011\u53ef\u4ee5\u901a\u904e\u5176\u4ed6\u65b9\u5f0f\u4f86\u5be6\u73fe\u985e\u4f3c\u7684\u529f\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u6578\u64da\u5eab\u6642\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728C\u8a9e\u8a00\u4e2d\u4f7f\u7528\u5faa\u74b0\u7d50\u69cb\u4f86\u7372\u53d6\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u793a\u4f8b\u4ee3\u78bc\u4f86\u5e6b\u52a9\u7406\u89e3\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e9%80%a3%e6%8e%a5-ESqfDVTvGt\">\u6578\u64da\u5eab\u9023\u63a5<\/h2>\n<p>\u5728\u958b\u59cb\u4e4b\u524d\uff0c\u6211\u5011\u9700\u8981\u78ba\u4fdd\u80fd\u5920\u9023\u63a5\u5230\u6578\u64da\u5eab\u3002\u901a\u5e38\uff0cC\u8a9e\u8a00\u6703\u4f7f\u7528\u4e00\u4e9b\u5eab\u4f86\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\uff0c\u4f8b\u5982MySQL\u7684C API\u3002\u4ee5\u4e0b\u662f\u9023\u63a5\u5230MySQL\u6578\u64da\u5eab\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n<pre><code>\n#include \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, \"host\", \"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<h2 id=\"%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a-ESqfDVTvGt\">\u67e5\u8a62\u6578\u64da<\/h2>\n<p>\u4e00\u65e6\u6210\u529f\u9023\u63a5\u5230\u6578\u64da\u5eab\uff0c\u6211\u5011\u53ef\u4ee5\u57f7\u884c\u67e5\u8a62\u4f86\u7372\u53d6\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n<pre><code>\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<\/code><\/pre>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%be%aa%e7%92%b0%e7%b5%90%e6%a7%8b%e7%8d%b2%e5%8f%96%e6%95%b8%e6%93%9a-ESqfDVTvGt\">\u4f7f\u7528\u5faa\u74b0\u7d50\u69cb\u7372\u53d6\u6578\u64da<\/h2>\n<p>\u5728C\u8a9e\u8a00\u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528while\u5faa\u74b0\u4f86\u904d\u6b77\u67e5\u8a62\u7d50\u679c\u3002\u9019\u7a2e\u65b9\u6cd5\u985e\u4f3c\u65bcforeach\u8a9e\u53e5\uff0c\u96d6\u7136\u8a9e\u6cd5\u4e0a\u6709\u6240\u4e0d\u540c\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u4f7f\u7528while\u5faa\u74b0\u4f86\u7372\u53d6\u6578\u64da\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nMYSQL_RES *result;\nMYSQL_ROW row;\n\nresult = 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\nwhile ((row = mysql_fetch_row(result))) {\n    printf(\"Column 1: %s, Column 2: %sn\", row[0], row[1]);\n}\n\nmysql_free_result(result);\n<\/code><\/pre>\n<h2 id=\"%e5%ae%8c%e6%95%b4%e7%a4%ba%e4%be%8b-ESqfDVTvGt\">\u5b8c\u6574\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u5b8c\u6574\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u9023\u63a5\u5230\u6578\u64da\u5eab\u3001\u57f7\u884c\u67e5\u8a62\u4e26\u4f7f\u7528\u5faa\u74b0\u7d50\u69cb\u7372\u53d6\u6578\u64da\uff1a<\/p>\n<pre><code>\n#include \n#include \n#include \n\nint main() {\n    MYSQL *conn;\n    MYSQL_RES *result;\n    MYSQL_ROW row;\n\n    conn = mysql_init(NULL);\n    if (conn == NULL) {\n        fprintf(stderr, \"mysql_init() failedn\");\n        return EXIT_FAILURE;\n    }\n\n    if (mysql_real_connect(conn, \"host\", \"user\", \"password\", \"database\", 0, NULL, 0) == NULL) {\n        fprintf(stderr, \"mysql_real_connect() failedn\");\n        mysql_close(conn);\n        return EXIT_FAILURE;\n    }\n\n    if (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\n    result = mysql_store_result(conn);\n    if (result == NULL) {\n        fprintf(stderr, \"mysql_store_result() failed. Error: %sn\", mysql_error(conn));\n        mysql_close(conn);\n        return EXIT_FAILURE;\n    }\n\n    while ((row = mysql_fetch_row(result))) {\n        printf(\"Column 1: %s, Column 2: %sn\", row[0], row[1]);\n    }\n\n    mysql_free_result(result);\n    mysql_close(conn);\n    return EXIT_SUCCESS;\n}\n<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-ESqfDVTvGt\">\u7d50\u8ad6<\/h2>\n<p>\u96d6\u7136C\u8a9e\u8a00\u6c92\u6709\u5167\u5efa\u7684foreach\u8a9e\u53e5\uff0c\u4f46\u6211\u5011\u53ef\u4ee5\u901a\u904e\u4f7f\u7528\u5faa\u74b0\u7d50\u69cb\u4f86\u5be6\u73fe\u985e\u4f3c\u7684\u529f\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u6578\u64da\u5eab\u67e5\u8a62\u6642\u3002\u901a\u904e\u4e0a\u8ff0\u793a\u4f8b\uff0c\u60a8\u53ef\u4ee5\u770b\u5230\u5982\u4f55\u9023\u63a5\u5230\u6578\u64da\u5eab\u3001\u57f7\u884c\u67e5\u8a62\u4e26\u904d\u6b77\u7d50\u679c\u96c6\u3002\u9019\u4e9b\u57fa\u672c\u64cd\u4f5c\u662f\u958b\u767c\u6578\u64da\u9a45\u52d5\u61c9\u7528\u7a0b\u5e8f\u7684\u57fa\u790e\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u9999\u6e2f\u7684VPS\u4e0a\u904b\u884c\u9019\u4e9b\u4ee3\u78bc\u6709\u8208\u8da3\uff0c\u6216\u8005\u60f3\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u6e90\u548c\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5982\u4f55\u5728C\u4e2d\u4f7f\u7528foreach\u8a9e\u53e5\u8f15\u9b06\u7372\u53d6\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\uff0c\u63d0\u5347\u958b\u767c\u6548\u7387\u8207\u4ee3\u78bc\u53ef\u8b80\u6027\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-60231","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60231","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=60231"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60231\/revisions"}],"predecessor-version":[{"id":60232,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60231\/revisions\/60232"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60231"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60231"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}