81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
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#include "sqlite3.h"
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#include <stdio.h>
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#include <cjson/cJSON.h>
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int main(int argc, char const *argv[])
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{
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// 连接到 SQLite 数据库
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sqlite3 *db; // 声明 sqlite3 类型变量，即声明一个数据库对象
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char *zErrMsg = 0; // 用于存储错误信息
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int rc; // 用于存储函数返回值
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rc = sqlite3_open("../sql_base/green_house.db", &db); // 打开指定的数据库文件，如果不存在将创建一个同名的数据库文件
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if (rc)
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{
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fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
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sqlite3_close(db);
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return 1;
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}
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fprintf(stderr, "好 Opened database successfully\n");
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// 获取前端传递的 JSON 数据
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char request_data[128] = "";
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fgets(request_data, 128, stdin); // 从标准输入中读取一行数据
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// 解析 JSON 数据
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cJSON *json_buf = cJSON_parse(request_data); // 解析 JSON 数据
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if (json_buf == NULL)
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{
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fprintf(stderr, "Error parsing JSON data\n");
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sqlite3_close(db);
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return 1;
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}
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// 获取用户名和密码
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cJSON *user = cJSON_GetObjectItemCaseSensitive(json_buf, "name");
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cJSON *password = cJSON_GetObjectItemCaseSensitive(json_buf, "password");
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if (user == NULL || password == NULL || !cJSON_IsString(user) || !cJSON_IsString(password))
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{
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fprintf(stderr, "Error getting username and/or password from JSON data\n");
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cJSON_Delete(json_buf);
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sqlite3_close(db);
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return 1;
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}
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// 拿到用户名和密码
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char *username_from_frontend = user->valuestring;
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char *password_from_frontend = password->valuestring;
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// 构建查询语句
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char query_sql[128] = "";
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sprintf(query_sql, "select * from login_users where username='%s' and password='%s'", username_from_frontend, password_from_frontend); // 构建查询语句
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// 执行查询语句
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rc = sqlite3_exec(db, query_sql, 0, 0, &zErrMsg); // 执行查询语句
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if (rc != SQLITE_OK)
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{
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fprintf(stderr, "SQL error: %s\n", zErrMsg);
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sqlite3_free(zErrMsg);
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cJSON_Delete(json_buf);
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sqlite3_close(db);
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return 1;
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}
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// 构建 JSON 数据
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cJSON *result_json = cJSON_CreateObject();
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cJSON_AddItemToObject(result_json, "result", cJSON_CreateString("success"));
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cJSON_AddItemToObject(result_json, "username", cJSON_CreateString(username_from_frontend));
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// 打印 JSON 数据
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char *result_json_str = cJSON_Print(result_json);
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printf("%s\n", result_json_str);
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// 释放资源
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cJSON_Delete(json_buf);
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cJSON_Delete(result_json);
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sqlite3_close(db);
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return 0;
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}
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