{"id":60171,"date":"2024-10-13T00:38:22","date_gmt":"2024-10-12T16:38:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60171\/"},"modified":"2024-10-13T00:38:22","modified_gmt":"2024-10-12T16:38:22","slug":"c%e8%aa%9e%e8%a8%80%e5%af%a6%e7%8f%be%e6%95%b8%e6%93%9a%e5%ba%ab%e5%a4%9a%e6%a8%a3%e6%80%a7%e8%a8%aa%e5%95%8f-c%e8%a8%aa%e5%95%8f%e5%a4%9a%e7%a8%ae%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60171\/","title":{"rendered":"C\u8a9e\u8a00\u5be6\u73fe\u6578\u64da\u5eab\u591a\u6a23\u6027\u8a2a\u554f (c\u8a2a\u554f\u591a\u7a2e\u6578\u64da\u5eab)"},"content":{"rendered":"

C\u8a9e\u8a00\u5be6\u73fe\u6578\u64da\u5eab\u591a\u6a23\u6027\u8a2a\u554f (C\u8a2a\u554f\u591a\u7a2e\u6578\u64da\u5eab)<\/h1>\n

\u5728\u7576\u4eca\u7684\u8edf\u4ef6\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u591a\u6a23\u6027\u4f7f\u5f97\u958b\u767c\u8005\u9700\u8981\u80fd\u5920\u9748\u6d3b\u5730\u8a2a\u554f\u4e0d\u540c\u985e\u578b\u7684\u6578\u64da\u5eab\u3002C\u8a9e\u8a00\u4f5c\u70ba\u4e00\u7a2e\u5e95\u5c64\u7de8\u7a0b\u8a9e\u8a00\uff0c\u96d6\u7136\u4e0d\u5982\u4e00\u4e9b\u9ad8\u7d1a\u8a9e\u8a00\u90a3\u6a23\u76f4\u89c0\uff0c\u4f46\u5b83\u4ecd\u7136\u53ef\u4ee5\u6709\u6548\u5730\u8207\u591a\u7a2e\u6578\u64da\u5eab\u9032\u884c\u4ea4\u4e92\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528C\u8a9e\u8a00\u8a2a\u554f\u4e0d\u540c\u985e\u578b\u7684\u6578\u64da\u5eab\uff0c\u5305\u62ecMySQL\u3001SQLite\u548cPostgreSQL\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u4ee3\u78bc\u3002<\/p>\n

1. C\u8a9e\u8a00\u8207MySQL\u7684\u9023\u63a5<\/h2>\n

MySQL\u662f\u4e00\u7a2e\u6d41\u884c\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0cC\u8a9e\u8a00\u53ef\u4ee5\u901a\u904eMySQL C API\u4f86\u8a2a\u554f\u3002\u9996\u5148\uff0c\u60a8\u9700\u8981\u5b89\u88ddMySQL\u958b\u767c\u5eab\uff0c\u7136\u5f8c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u78bc\u9023\u63a5\u5230MySQL\u6578\u64da\u5eab\uff1a<\/p>\n

#include <stdio.h>\n#include <mysql\/mysql.h>\n\nint main() {\n    MYSQL *conn;\n    conn = mysql_init(NULL);\n    \n    if (conn == NULL) {\n        fprintf(stderr, \"mysql_init() failedn\");\n        return EXIT_FAILURE;\n    }\n\n    if (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\n    \/\/ \u57f7\u884c\u67e5\u8a62\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    mysql_close(conn);\n    return EXIT_SUCCESS;\n}\n<\/code><\/pre>\n
2. C\u8a9e\u8a00\u8207SQLite\u7684\u9023\u63a5<\/h2>\n
SQLite\u662f\u4e00\u7a2e\u8f15\u91cf\u7d1a\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\uff0c\u9069\u5408\u5d4c\u5165\u5f0f\u61c9\u7528\u3002\u4f7f\u7528SQLite\u7684C API\u975e\u5e38\u7c21\u55ae\uff0c\u4ee5\u4e0b\u662f\u9023\u63a5SQLite\u6578\u64da\u5eab\u7684\u793a\u4f8b\uff1a<\/p>\n
#include <stdio.h>\n#include <sqlite3.h>\n\nint main() {\n    sqlite3 *db;\n    char *err_msg = 0;\n\n    int rc = sqlite3_open(\"test.db\", &db);\n    \n    if (rc != SQLITE_OK) {\n        fprintf(stderr, \"Cannot open database: %sn\", sqlite3_errmsg(db));\n        return rc;\n    }\n\n    const char *sql = \"SELECT * FROM table_name\";\n\n    rc = sqlite3_exec(db, sql, 0, 0, &err_msg);\n    \n    if (rc != SQLITE_OK) {\n        fprintf(stderr, \"SQL error: %sn\", err_msg);\n        sqlite3_free(err_msg);\n    }\n\n    sqlite3_close(db);\n    return 0;\n}\n<\/code><\/pre>\n
3. C\u8a9e\u8a00\u8207PostgreSQL\u7684\u9023\u63a5<\/h2>\n
PostgreSQL\u662f\u4e00\u7a2e\u529f\u80fd\u5f37\u5927\u7684\u958b\u6e90\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u3002\u8981\u5728C\u8a9e\u8a00\u4e2d\u4f7f\u7528PostgreSQL\uff0c\u60a8\u9700\u8981\u5b89\u88ddlibpq\u958b\u767c\u5eab\u3002\u4ee5\u4e0b\u662f\u9023\u63a5PostgreSQL\u6578\u64da\u5eab\u7684\u793a\u4f8b\uff1a<\/p>\n
#include <stdio.h>\n#include <stdlib.h>\n#include <libpq-fe.h>\n\nint main() {\n    PGconn *conn = PQconnectdb(\"user=user dbname=database\");\n\n    if (PQstatus(conn) != CONNECTION_OK) {\n        fprintf(stderr, \"Connection to database failed: %s\", PQerrorMessage(conn));\n        PQfinish(conn);\n        return EXIT_FAILURE;\n    }\n\n    PGresult *res = PQexec(conn, \"SELECT * FROM table_name\");\n    \n    if (PQresultStatus(res) != PGRES_TUPLES_OK) {\n        fprintf(stderr, \"SELECT failed: %s\", PQerrorMessage(conn));\n        PQclear(res);\n        PQfinish(conn);\n        return EXIT_FAILURE;\n    }\n\n    PQclear(res);\n    PQfinish(conn);\n    return EXIT_SUCCESS;\n}\n<\/code><\/pre>\n
4. \u7d50\u8ad6<\/h2>\n
\u901a\u904e\u4ee5\u4e0a\u793a\u4f8b\uff0c\u6211\u5011\u53ef\u4ee5\u770b\u5230C\u8a9e\u8a00\u80fd\u5920\u9748\u6d3b\u5730\u8a2a\u554f\u591a\u7a2e\u6578\u64da\u5eab\u3002\u7121\u8ad6\u662fMySQL\u3001SQLite\u9084\u662fPostgreSQL\uff0cC\u8a9e\u8a00\u90fd\u63d0\u4f9b\u4e86\u76f8\u61c9\u7684API\u4f86\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\u3002\u9019\u4f7f\u5f97\u958b\u767c\u8005\u80fd\u5920\u6839\u64da\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u4e26\u5728C\u8a9e\u8a00\u4e2d\u5be6\u73fe\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728\u7576\u4eca\u7684\u958b\u767c\u74b0\u5883\u4e2d\uff0c\u80fd\u5920\u4f7f\u7528C\u8a9e\u8a00\u8a2a\u554f\u591a\u7a2e\u6578\u64da\u5eab\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u7121\u8ad6\u662f\u4f7f\u7528MySQL\u3001SQLite\u9084\u662fPostgreSQL\uff0c\u958b\u767c\u8005\u90fd\u80fd\u5920\u9748\u6d3b\u5730\u9078\u64c7\u6700\u9069\u5408\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u3002\u82e5\u60a8\u9700\u8981\u7a69\u5b9a\u7684 VPS<\/a> \u670d\u52d9\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684 \u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22C\u8a9e\u8a00\u5982\u4f55\u5be6\u73fe\u591a\u7a2e\u6578\u64da\u5eab\u7684\u9748\u6d3b\u8a2a\u554f\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\u8207\u61c9\u7528\u517c\u5bb9\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-60171","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60171","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=60171"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60171\/revisions"}],"predecessor-version":[{"id":60172,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60171\/revisions\/60172"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60171"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60171"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60171"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}