在使用QueryRunner转换查询结果的时候：
QueryRunner qr = new QueryRunner();
List<Book> list = qr.query(sql, new BeanListHandler<Book>(Book.class));
报错
java.sql.SQLException: Cannot create Book
原因
没给Book类写无参构造函数，加上之后就好了
创建的完整Book类
public class Book {
private int bid;
private String bname;
private float price;
private int category;
public Book() {
}
public int getBid() {
return bid;
}
public void setBid(int bid) {
this.bid = bid;
}
public String getBname() {
return bname;
}
public void setBname(String bname) {
this.bname = bname;
}
public float getPrice() {
return price;
}
public void setPrice(float price) {
this.price = price;
}
public int getCategory() {
return category;
}
public void setCategory(int category) {
this.category = category;
}
}
