javaweb學習20:JavaBean
阿新 • • 發佈:2022-03-29
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JavaBean:實體類
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要有一個無參構造;
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屬性必須私有化;
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必須有對應的get/set方法
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一般用來和資料庫的欄位做對映;ORM
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ORM:物件關係對映;
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表--->類
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欄位-->屬性
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記錄-->物件
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資料庫表格:people表
id name age address 1 demo1 11 北京市 2 demo2 12 上海市 3 demo3 13 廣州市
class People{
private int id;
private String name;
private String address;
}
class A{
new People(1,"demo1",11,"北京市");
new People(2,"demo2",12,"上海市");
new People(3,"demo3",13,"廣州市");
}
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程式碼案例:javabean
<%
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程式碼案例:實體類,我們一般都是和資料庫中的表結構一一對應的
package com.lesson.pojo;
//實體類,我們一般都是和資料庫中的表結構一一對應的;
public class People {
private int id;
private String name;
private int age;
private String address;
public People() {
}
public People(int id, String name, int age, String address) {
this.id = id;
this.name = name;
this.age = age;
this.address = address;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}