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回调函数v1

This commit is contained in:
flykhan 2023-10-25 14:37:39 +08:00
parent 9d07810e70
commit 2da456316c
1 changed files with 41 additions and 26 deletions
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59
cgi-bin/sqlite_cgi_base.c
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@ -5,18 +5,20 @@
// sqlite3的回调函数
// sqlite 每查到一条记录，就调用一次这个回调
int sql_search_callback(void* NotUsed, int argc, char** argv, char** azColName);
int sql_search_callback(void *NotUsed, int argc, char **argv, char **azColName);
int main(int argc, char const* argv[]) {
int main(int argc, char const *argv[])
{
// 连接到 SQLite 数据库
sqlite3* db; // 声明 sqlite3 类型变量，即声明一个数据库对象
char* zErrMsg = 0; // 用于存储错误信息
sqlite3 *db; // 声明 sqlite3 类型变量，即声明一个数据库对象
char *zErrMsg = 0; // 用于存储错误信息
int rc; // 用于存储函数返回值
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
if (rc) {
if (rc)
{
fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
return 1;
@ -28,19 +30,21 @@ int main(int argc, char const* argv[]) {
fgets(request_data, 128, stdin); // 从标准输入中读取一行数据
// 解析 JSON 数据
cJSON* json_buf = cJSON_Parse(request_data); // 解析 JSON 数据
if (json_buf == NULL) {
cJSON *json_buf = cJSON_Parse(request_data); // 解析 JSON 数据
if (json_buf == NULL)
{
fprintf(stderr, "Error parsing JSON data\n");
sqlite3_close(db);
return 1;
}
// 获取用户名和密码
cJSON* user = cJSON_GetObjectItemCaseSensitive(json_buf, "name");
cJSON* password = cJSON_GetObjectItemCaseSensitive(json_buf, "password");
cJSON *user = cJSON_GetObjectItemCaseSensitive(json_buf, "name");
cJSON *password = cJSON_GetObjectItemCaseSensitive(json_buf, "password");
if (user == NULL || password == NULL || !cJSON_IsString(user) ||
!cJSON_IsString(password)) { // 是否是非法输入
!cJSON_IsString(password))
{ // 是否是非法输入
fprintf(stderr,
"Error getting username and/or password from JSON data\n");
cJSON_Delete(json_buf);
@ -49,8 +53,8 @@ int main(int argc, char const* argv[]) {
}
// 拿到用户名和密码
char* username_from_frontend = user->valuestring;
char* password_from_frontend = password->valuestring;
char *username_from_frontend = user->valuestring;
char *password_from_frontend = password->valuestring;
printf("username is %s, pwd is %s\n", username_from_frontend,
password_from_frontend);
@ -58,14 +62,16 @@ int main(int argc, char const* argv[]) {
// 构建查询语句
char query_sql[128] = "";
sprintf(query_sql,
"select * from login_users where username='%s' and password='%s'",
"select * from login_users where username='%s' and password='%s';",
username_from_frontend, password_from_frontend); // 构建查询语句
printf("query_sql is %s\n", query_sql);
// 执行查询语句
// rc = sqlite3_exec(db, query_sql, 0, 0, &zErrMsg); // 执行查询语句
rc = sqlite3_exec(db, query_sql, sql_search_callback, 0,
&zErrMsg); // 执行查询语句
if (rc != SQLITE_OK) {
rc = sqlite3_exec(db, query_sql, sql_search_callback, 0, &zErrMsg); // 执行查询语句
if (rc != SQLITE_OK)
{
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
cJSON_Delete(json_buf);
@ -74,14 +80,14 @@ int main(int argc, char const* argv[]) {
}
// 构建 JSON 数据
cJSON* result_json = cJSON_CreateObject();
cJSON *result_json = cJSON_CreateObject();
cJSON_AddItemToObject(result_json, "result", cJSON_CreateString("success"));
cJSON_AddItemToObject(result_json, "username",
cJSON_CreateString(username_from_frontend));
// 打印 JSON 数据
char* result_json_str = cJSON_Print(result_json);
printf("%s\n", result_json_str);
char *result_json_str = cJSON_Print(result_json);
// printf("%s\n", result_json_str);
// 释放资源
cJSON_Delete(json_buf);
@ -91,7 +97,16 @@ int main(int argc, char const* argv[]) {
return 0;
}
int sql_search_callback(void* NotUsed,
int sql_search_callback(void *NotUsed,
int argc,
char** argv,
char** azColName) {}
char **argv,
char **azColName)
{
int i;
for (i = 0; i < argc; i++)
{
printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
}
return 0;
}