我有以下问题，无法在论坛上发布

Question

发布错误

调试模式

SQL错误：1062键“ PRIMARY”的条目“ 0”重复

INSERT INTO nuke_bbtopics（topic_title，topic_poster，topic_time，forum_id，topic_status，topic_type，topic_vote）值（“测试”，39、1541598387、22、0、0、0）

行：227 文件：functions_post.php

Answer 1

您遇到的问题不是查询，而是表顺序。只需重新排序自动增量即可。

Answer 2

您的自动递增未排序。检查您在#include <stdio.h> #include <stdlib.h> #include <string.h> struct car { char name[30]; int quantity; }; void increaseSize(int *cap, int size, struct car **carArray) { printf("cap = %d size = %d\n", *cap, size); *cap *= 2; printf("cap x 2 = %d\n", *cap); struct car *newCarArray = (struct car * ) malloc(*cap * sizeof(struct car)); memcpy(newCarArray, carArray, sizeof(struct car)); free(*carArray); // If I free old carArray here, it will give incorrect results. How can I release/clear/delete/free the memory of the old array here? carArray = &newCarArray; printf("increased cap = %d size = %d\n", *cap, size); } void printArray(int cap, int size, struct car *carArray) { printf("Capacity = %d, Size = %d \n", cap, size); for(int i = 0; i < size; i++) { printf("Car %d, Name: %s, Quantity: %d\n", i, carArray[i].name, carArray[i].quantity); } } int main() { int cap = 2; int size = 0; struct car *carArray = (struct car *) malloc(cap * sizeof(struct car)); struct car car_0 = {"Corolla", 5}; carArray[0] = car_0; size++; struct car car_1 = {"Accord", 8}; carArray[1] = car_1; size++; printArray(cap, size, carArray); increaseSize(&cap, size, &carArray); struct car car_2 = {"Forte", 3}; carArray[2] = car_2; size++; printArray(cap, size, carArray); free(carArray); return 0; } 上是否有PRIMARY_KEY。