本周首先暂时结束了java高级知识,进入到了数据库的学习:
java高级部分:
1.多线程:线程并发(多个线程操作共享变量);
锁机制,关键字有synchronize(并发线程安全,可锁对象和方法),wait,notify
(悲观)死锁,,wait,notify,notifyAll;
2.网络编程:UDP数据广播(数据发送者只需向交换机发送一个拷贝,交换机负责将这个信息制作n个拷贝发送给所有机器)
Http协议(HyperText Transfer Protocol)
Json数据格式,语法规则:JSON对象{"属性名":"属性值"}
JSON数组["元素1","元素2"...]
JSON插件:- Json-lib
- Gson
- Jackson
- FastJSON - alibaba
;
数据库部分:(采用mysql5.5数据库,以及navicat图形工具对其操作)
3.系统以及mysql常用命令
系统命令(以管理员身份运行)
: #启动服务
net start mysql
#停止服务
net stop mysql
#进入mysql命令行
mysql -uroot -p密码
#退出mysql命令行
exit
#修改密码
mysqladmin -uroot -p123456 password 密码
#备份数据库实例 mysqldump -uroot -proot mydb > d:/mydb.sql
#备份表 mysqldump -uroot -proot mydb tbuser > d:/tbuser.sql
Mysql常用命令
: --显示数据库实例
show databases;
--创建数据库实例
create database mydb;
--使用数据库实例
user mydb;
--显示实例中所有数据库表
show tables;
SQL语句
auto_increment:设置列自增,可用于主键列以及非空唯一列(not null unique)
unsigned:设置无符号列(列值不允许为负数)
zerofill:设置零填充列(当列数据长度不到定义长度时,数值前补0)
4.SQL语句:
DDL(数据库定义语言:用来建立数据库、数据库对象和定义其列):create、desc(查看表结构)、alter、drop
DML (数据库操纵语言:增删改查):select、insert、delete、update;
DCL(数据库控制语言:控制权限)revork,grant;
5.(完整性条件)约束:1. 主键约束
2. 外键约束
3. 不为空约束
4. 唯一约束
5. 检查约束(mysql暂不支持)
6.数据类型、运算符
7.查询(重点):SELECT 查询列1,查询列2,...
FROM 目标表
【WHERE 查询条件】
【GROUP BY 列名称】
【HAVING 查询条件】
【ORDER BY 列名称 ASC|DESC】
【LIMIT [偏移行,]记录行数】
单表查询:模糊查询(“%”,“_”),聚合函数
多表查询:等值连接,外连接
mysql函数的使用。
import java.io.Serializable; /** * 工作详情类 * @author NIUXUYUAN */ public class Jobs implements Serializable{ /** * */ private static final long serialVersionUID = 1L; private String id; //id private String experience; //工作经验 private String city; //工作地点 private String industry; //行业 private String detail; //工作详情 private String company; //公司 private String jobname; //职位 public Jobs(String id, String experience, String city, String industry, String detail, String company, String jobname) { super(); this.id = id; this.experience = experience; this.city = city; this.industry = industry; this.detail = detail; this.company = company; this.jobname = jobname; } @Override public String toString() { return "Jobs [id=" + id + ", experience=" + experience + ", city=" + city + ", industry=" + industry + ", detail=" + detail + ", company=" + company + ", jobname=" + jobname + "]"; } public String toString(int i) { return experience+city+industry+detail+company+jobname; } public Jobs() { // TODO Auto-generated constructor stub } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getExperience() { return experience; } public void setExperience(String experience) { this.experience = experience; } public String getCity() { return city; } public void setCity(String city) { this.city = city; } public String getIndustry() { return industry; } public void setIndustry(String industry) { this.industry = industry; } public String getDetail() { return detail; } public void setDetail(String detail) { this.detail = detail; } public String getCompany() { return company; } public void setCompany(String company) { this.company = company; } public String getJobname() { return jobname; } public void setJobname(String jobname) { this.jobname = jobname; } }
import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.util.ArrayList; import java.util.List; public class AddJobs { static List<Jobs> list = new ArrayList<>(); File file = new File("jobs"); /** * 输入数据 * @throws IOException */ public void input() throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); System.out.println("以id/experience/education/city/industry/detail/company/jobname格式填入:"); String msg = ""; while(!(msg = br.readLine()).equalsIgnoreCase("quit")) { add(msg); } br.close(); } /** * 将数据变为Jobs对象存入list集合 * @param msg */ private void add(String msg) { String[] s = msg.split("/"); Jobs job = new Jobs(s[0], s[1], s[2], s[3], s[4], s[5], s[6]); list.add(job); } private void checkFile() throws FileNotFoundException, IOException, ClassNotFoundException { if(file.length()>0) { ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file)); List<Jobs> temp = (List<Jobs>)ois.readObject(); if(temp!=null) { list.clear(); for(Jobs t:temp) { list.add(t); } } ois.close(); } } public static void main(String[] args) throws FileNotFoundException, IOException, ClassNotFoundException { AddJobs aj = new AddJobs(); if(!aj.file.exists()) { aj.file.createNewFile(); } aj.checkFile(); aj.input(); ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(aj.file)); oos.writeObject(list); oos.close(); } }
import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; import java.io.ObjectInputStream; import java.util.ArrayList; import java.util.List; public class Query { static List<Jobs> list = new ArrayList<>(); File file = new File("jobs"); /** * 查看file文件,将数据导入list集合 * @throws FileNotFoundException * @throws IOException * @throws ClassNotFoundException */ private void checkFile() throws FileNotFoundException, IOException, ClassNotFoundException { if(file.length()>0) { ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file)); List<Jobs> temp = (List<Jobs>)ois.readObject(); if(temp!=null) { list.clear(); for(Jobs t:temp) { list.add(t); } } ois.close(); } } public void check() throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); System.out.println("请输入experience/education/city/industry/detail/company/jobname的某些信息"); String msg = br.readLine(); String[] s = msg.split("/"); String regex = ""; for (String str : s) { regex += "[\\s\\S]*" + str + "[\\s\\S]*"; } List<Jobs> temp = new ArrayList<>(); for (Jobs j : list) { msg = j.toString(1); if(msg.matches(regex)) { temp.add(j); } } System.out.println("结果"); for (Jobs jobs : temp) { System.out.println(jobs); } } public static void main(String[] args) throws FileNotFoundException, ClassNotFoundException, IOException { Query q = new Query(); q.checkFile(); q.check(); } }
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