标签：char var 更改 外键 primary arc 支持 而在 设计
package com.figsprite.o2o.bean;
import java.util.Date;
public class Area {
private Integer areaId;
private String areaName;
private Integer priority;
private Date createTime;
private Date lastEditTime;
public Integer getAreaId() {
return areaId;
}
public void setAreaId(Integer areaId) {
this.areaId = areaId;
}
public String getAreaName() {
return areaName;
}
public void setAreaName(String areaName) {
this.areaName = areaName;
}
public Integer getPriority() {
return priority;
}
public void setPriority(Integer priority) {
this.priority = priority;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public Date getLastEditTime() {
return lastEditTime;
}
public void setLastEditTime(Date lastEditTime) {
this.lastEditTime = lastEditTime;
}
}
接下来创建数据库
接着按照上面的javabean，添加列
package com.figsprite.o2o.bean;
import java.util.Date;
public class PersonInfo {
private Long userId;
private String name;
private String profileImg;
private String email;
private String gender;
private Integer enableStatus;
//1.顾客 2.店家 3.超级管理员
private Integer userType;
private Date createTime;
private Date lastEditTime;
public Long getUserId() {
return userId;
}
public void setUserId(Long userId) {
this.userId = userId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getProfileImg() {
return profileImg;
}
public void setProfileImg(String profileImg) {
this.profileImg = profileImg;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public Integer getEnableStatus() {
return enableStatus;
}
public void setEnableStatus(Integer enableStatus) {
this.enableStatus = enableStatus;
}
public Integer getUserType() {
return userType;
}
public void setUserType(Integer userType) {
this.userType = userType;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public Date getLastEditTime() {
return lastEditTime;
}
public void setLastEditTime(Date lastEditTime) {
this.lastEditTime = lastEditTime;
}
}
USE school_o2o; CREATE TABLE `tb_person_info`( `user_id` INT(10) NOT NULL AUTO_INCREMENT, `name` VARCHAR(32) DEFAULT NULL, `profile_img` VARCHAR(1024) DEFAULT NULL, `email` VARCHAR(1024) DEFAULT NULL, `gender` VARCHAR(2) DEFAULT NULL, `enable_status` INT(2) NOT NULL DEFAULT 0, `user_type` INT(2) NOT NULL DEFAULT 1 , `create_time` DATETIME DEFAULT NULL, `last_edit_time` DATETIME DEFAULT NULL, PRIMARY KEY(`user_id`) )ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET = utf8
在这里，简单介绍一下MYSQL的两个常用引擎的区别：
( • ?ω•? )?
MyISAM只支持表级锁，什么是表级锁呢？比如如果一个线程要更改第二行记录，那么另外一个线程想更改第三行记录，但是因为MyISAM是表级锁，所以后面那个线程只好在哪里静静等待，不过MyISAM的读能力很强，因为它是基于权标扫描，然而InnoDB是行级锁，也就是小A同学在改第一行的时候，小B同学可以同时改第三行(反正不要再改第一行都OK)，
总之，InnoDB在写的方面略强于MyISAM，然而在读方面MyISAM远强于InnoDB， 但InnoDB支持事务控制，因此如果读的操作比较多建议使用MyISAM
package com.figsprite.o2o.bean;
import java.util.Date;
public class WechatAuth {
private Long wechatAuthId;
private String openId;
private Date createTime;
private PersonInfo personInfo;
public Long getWechatAuthId() {
return wechatAuthId;
}
public void setWechatAuthId(Long wechatAuthId) {
this.wechatAuthId = wechatAuthId;
}
public String getOpenId() {
return openId;
}
public void setOpenId(String openId) {
this.openId = openId;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public PersonInfo getPersonInfo() {
return personInfo;
}
public void setPersonInfo(PersonInfo personInfo) {
this.personInfo = personInfo;
}
}
这里用户ID相对于该表是个外键，所以在JavaBean里我们通过一个对象引用的方式表示外键
package com.figsprite.o2o.bean;
import java.util.Date;
public class LocalAuth {
private Long localAuthId;
private String username;
private String password;
private Date createTime;
private Date lastEditTime;
private PersonInfo personInfo;
public Long getLocalAuthId() {
return localAuthId;
}
public void setLocalAuthId(Long localAuthId) {
this.localAuthId = localAuthId;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public Date getLastEditTime() {
return lastEditTime;
}
public void setLastEditTime(Date lastEditTime) {
this.lastEditTime = lastEditTime;
}
public PersonInfo getPersonInfo() {
return personInfo;
}
public void setPersonInfo(PersonInfo personInfo) {
this.personInfo = personInfo;
}
}
标签：char var 更改 外键 primary arc 支持 而在 设计
原文地址：https://www.cnblogs.com/figsprite/p/10665913.html
