在c代码中直接创建数据库，并且做了cmp，返回json类型的code

www/cgi-bin/c_mysql_user&pwd.c

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+#include <cjson/cJSON.h>
+#include <fcntl.h>
+#include <mysql/mysql.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+int main() {
+    // 连接到 MySQL 数据库
+    MYSQL *conn;
+    MYSQL_RES *res;
+    MYSQL_ROW row;
+
+    conn = mysql_init(NULL);
+    if (conn == NULL) {
+        fprintf(stderr, "mysql_init() failed\n");
+        exit(1);
+    }
+
+    if (mysql_real_connect(conn, "localhost", "root", "root", "router", 3306,
+                           NULL, 0) == NULL) {
+        fprintf(stderr, "mysql_real_connect() failed\n");
+        mysql_close(conn);
+        exit(1);
+    }
+
+    if (mysql_query(conn,
+                    "CREATE TABLE IF NOT EXISTS users(id INT AUTO_INCREMENT "
+                    "PRIMARY KEY "
+                    "username VARCHAR(50) NOT NULL, password VARCHAR(255) NOT "
+                    "NULL);")) {
+        fprintf(stderr, "CREATE TABLE query failed. Error: %s\n",
+                mysql_error(conn));
+        mysql_close(conn);
+        exit(1);
+    }
+
+    // 获取前端传递的 JSON 数据
+    char request_data[128] = "";
+    fgets(request_data, 128, stdin);
+
+    // 解析 JSON 数据
+    cJSON *p = cJSON_Parse(request_data);
+    if (p == NULL) {
+        fprintf(stderr, "Error parsing JSON data\n");
+        mysql_close(conn);
+        return 1;
+    }
+
+    // 获取用户名和密码
+    cJSON *user = cJSON_GetObjectItemCaseSensitive(p, "user");
+    cJSON *pwd = cJSON_GetObjectItemCaseSensitive(p, "pwd");
+
+    if (user == NULL || pwd == NULL || !cJSON_IsString(user) ||
+        !cJSON_IsString(pwd)) {
+        fprintf(stderr,
+                "Error getting username and/or password from JSON data\n");
+        cJSON_Delete(p);
+        mysql_close(conn);
+        return 1;
+    }
+
+    char *username_from_frontend = user->valuestring;
+    char *password_from_frontend = pwd->valuestring;
+
+    // 构建查询语句
+    char query[1000];
+    sprintf(query, "SELECT * FROM users WHERE username='%s' AND password='%s'",
+            username_from_frontend, password_from_frontend);
+
+    if (mysql_query(conn, query)) {
+        fprintf(stderr, "SELECT query failed. Error: %s\n", mysql_error(conn));
+        cJSON_Delete(p);
+        mysql_close(conn);
+        return 1;
+    }
+
+    res = mysql_store_result(conn);
+    if (res == NULL) {
+        fprintf(stderr, "mysql_store_result() failed\n");
+        cJSON_Delete(p);
+        mysql_close(conn);
+        return 1;
+    }
+
+    cJSON *result_json = cJSON_CreateObject();
+
+    if ((row = mysql_fetch_row(res))) {
+        cJSON_AddNumberToObject(result_json, "code", 0);
+    } else {
+        cJSON_AddNumberToObject(result_json, "code", 1);
+        cJSON_AddStringToObject(result_json, "msg", "用户名或口令错误");
+    }
+
+    /* if ((row = mysql_fetch_row(res))) {
+        cJSON_AddStringToObject(result_json, "code", 0);
+    } else {
+        cJSON_AddStringToObject(result_json, "msg", "登录失败");
+    } */
+
+    char *result_json_string = cJSON_Print(result_json);
+
+    // 输出 JSON 结果
+    printf("content-type: application/json;charset=utf-8\r\n");
+    printf("\r\n");
+    printf("%s\n", result_json_string);
+
+    free(result_json_string);
+    cJSON_Delete(result_json);
+    cJSON_Delete(p);
+    mysql_free_result(res);
+    mysql_close(conn);
+
+    return 0;
+}