小编sue*_*nda的帖子

我有两个实体，书和作者。

@Entity
@Table(name="book") 
class Book {
    private int id;
    private Map<Integer, Author> authors = new HashMap<Integer, Author>();

    @Id
    @GeneratedValue
    @Column(name="id_book")
    public int getId() {
        return this.id;
    }

    @OneToMany(fetch=FetchType.EAGER)
    @JoinTable(name="book_author", joinColumns= {@JoinColumn(name="id_book")},
            inverseJoinColumns = {@JoinColumn(name="id_author", table="author")})
    @MapKeyColumn(name="order")
    public Map<Integer, Author> getAuthors() {
        return authors;
    }


}

@Entity
@Table(name="author")
class Author {

    private int id;
    private String lastname;
    private String firstname;

    @Id
    @Column(name="id_author")
    @GeneratedValue
    public int getId() {
        return id;
    }

    public String getLastname() {
        return lastname;
    }

    public String getFirstname() { …

我试图定义一个包含指向字符串的char指针的动态数组.字符串可以是任意长度,所以我使用了char指针.我希望每次需要存储更多值时动态调整数组大小.以下代码给出了分段错误.我做得好吗？

int main() {
    char **input=NULL;
    char *buffer;

    int i=0;

    do {
        input = (char **)realloc(input, (i+1) * sizeof(char *));

        scanf("%s", &buffer);
        strcpy(input[i++],buffer);

    } while(strlen(buffer)!=0);


}