spring5x-jdbc-database 此模块是从spring5x-base 基础模块扩展过来的
spring5x-base模块是一个非常干净的spring5.x+springMVC架构
如果没有搭建spring5x-base模块，请参考 spring5x-base模块搭建
搭建项目
基于spring5x-base 基础模块 新增功能：
- 1、jdbc主要依赖和配置
- 2、雪花算生成法递增趋势id
- 3、JdbcTemplate操作数据库
1、jdbc主要依赖和配置
pom.xml 依赖
org.springframework
spring-tx
${spring.version}
org.springframework
spring-jdbc
${spring.version}
mysql
mysql-connector-java
8.0.13
com.oracle
ojdbc6
11.2.0.3
jdbc.properties
# mysql 数据库配置:需要修改用户/密码
mysql.jdbc.driverClassName=com.mysql.cj.jdbc.Driver
mysql.jdbc.url=jdbc:mysql://127.0.0.1:3306/test?characterEncoding=UTF-8&serverTimezone=UTC&useSSL=false
mysql.jdbc.username=root
mysql.jdbc.password=123456
mysql.jdbc.validationQuery=select 'x'
# oracle 数据库配置:需要修改用户/密码
oracle.jdbc.driverClassName=oracle.jdbc.driver.OracleDriver
oracle.jdbc.url=jdbc:oracle:thin:@127.0.0.1/orcl
oracle.jdbc.username=duke
oracle.jdbc.password=duke
oracle.jdbc.validationQuery=select 'x' from dual
spring-jdbc.xml
2、雪花算生成法递增趋势id
SnowFlake.java
package com.zja.util;
/**
* Desc：雪花算法：分布式自增ID(是递增趋势，非递增)雪花算法snowflake (Java版)
*/
public class SnowFlake {
/**
* 起始的时间戳
*/
private final static long START_STMP = 1480166465631L;
/**
* 每一部分占用的位数
*/
private final static long SEQUENCE_BIT = 12; //序列号占用的位数
private final static long MACHINE_BIT = 5; //机器标识占用的位数
private final static long DATACENTER_BIT = 5;//数据中心占用的位数
/**
* 每一部分的最大值
*/
private final static long MAX_DATACENTER_NUM = -1L ^ (-1L << DATACENTER_BIT);
private final static long MAX_MACHINE_NUM = -1L ^ (-1L << MACHINE_BIT);
private final static long MAX_SEQUENCE = -1L ^ (-1L << SEQUENCE_BIT);
/**
* 每一部分向左的位移
*/
private final static long MACHINE_LEFT = SEQUENCE_BIT;
private final static long DATACENTER_LEFT = SEQUENCE_BIT + MACHINE_BIT;
private final static long TIMESTMP_LEFT = DATACENTER_LEFT + DATACENTER_BIT;
private long datacenterId; //数据中心
private long machineId; //机器标识
private long sequence = 0L; //序列号
private long lastStmp = -1L;//上一次时间戳
public SnowFlake(long datacenterId, long machineId) {
if (datacenterId > MAX_DATACENTER_NUM || datacenterId < 0) {
throw new IllegalArgumentException("datacenterId can't be greater than MAX_DATACENTER_NUM or less than 0");
}
if (machineId > MAX_MACHINE_NUM || machineId < 0) {
throw new IllegalArgumentException("machineId can't be greater than MAX_MACHINE_NUM or less than 0");
}
this.datacenterId = datacenterId;
this.machineId = machineId;
}
/**
* 产生下一个ID
*
* @return
*/
public synchronized long nextId() {
long currStmp = getNewstmp();
if (currStmp < lastStmp) {
throw new RuntimeException("Clock moved backwards. Refusing to generate id");
}
if (currStmp == lastStmp) {
//相同毫秒内，序列号自增
sequence = (sequence + 1) & MAX_SEQUENCE;
//同一毫秒的序列数已经达到最大
if (sequence == 0L) {
currStmp = getNextMill();
}
} else {
//不同毫秒内，序列号置为0
sequence = 0L;
}
lastStmp = currStmp;
return (currStmp - START_STMP) << TIMESTMP_LEFT //时间戳部分
| datacenterId << DATACENTER_LEFT //数据中心部分
| machineId << MACHINE_LEFT //机器标识部分
| sequence; //序列号部分
}
private long getNextMill() {
long mill = getNewstmp();
while (mill <= lastStmp) {
mill = getNewstmp();
}
return mill;
}
private long getNewstmp() {
return System.currentTimeMillis();
}
public static void main(String[] args) {
SnowFlake snowFlake = new SnowFlake(2, 3);
long start = System.currentTimeMillis();
for (int i = 0; i < 1000000; i++) {
System.out.println(snowFlake.nextId());
}
//100万个id大概5~12秒
System.out.println(System.currentTimeMillis() - start);
}
}
自定义生成递增趋势id，目的支持跨数据库
/**
* Desc：自定义生成递增趋势id，目的支持跨数据库
*/
@Component
public class MyId {
public long generateId() {
SnowFlake snowFlake = new SnowFlake(2, 3);
System.out.println(snowFlake.nextId());
return snowFlake.nextId();
}
}
3、JdbcTemplate操作数据库
package com.zja.service.Impl;
import com.zja.entity.UserEntity;
import com.zja.rowmapper.UserEntityRowMapper;
import com.zja.service.UserService;
import com.zja.util.MyId;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* Date: 2019-11-28 15:59
* Author: zhengja
* Email: [email protected]
* Desc：用户操作：jdbc模板增删改查
*/
@Service
public class UserServiceImpl implements UserService {
@Autowired
private JdbcTemplate jdbcTemplate;
@Autowired
private MyId myId;
/**
* 增加用户(将用户保存到数据库)
*
* @param
*/
@Override
public Object saveUser(String username, int age) {
UserEntity userByName = (UserEntity) this.findUserByName(username);
if (userByName == null) {
String sql = "insert into userentity (id,username,age) values(?,?,?)";
Object[] args = {myId.generateId(),username, age};
int insert = this.jdbcTemplate.update(sql, args);
if (insert > 0) {
return "新增用户成功!!!";
}
}
return "用户已存在,请改用其它用户名称!";
}
/**
* 根据用户名称修改用户年龄(修改库中用户信息)
*
* @param
*/
@Override
public Object updateUser(String username, int age) {
UserEntity userByName = (UserEntity) this.findUserByName(username);
if (userByName != null) {
//sql语句
String sql = "update userentity SET age = ? WHERE username = ?";
Object[] args = {age, username};
int update = jdbcTemplate.update(sql, args);
if (update > 0) {
return "修改用户年龄成功!!!";
}
}
return "用户名称不存在,修改年龄失败!";
}
/**
* 根据用户名查询用户信息(从数据库中获取用户信息)
*
* @param username 用户名称
*/
@Override
public Object findUserByName(String username) {
List query = jdbcTemplate.query("select * from userentity where username=?", new BeanPropertyRowMapper(UserEntity.class), username);
if (query.isEmpty()) {
return null;
} else if (query.size() > 1) {
throw new RuntimeException("结果集不唯一");
} else {
return query.get(0);
}
}
/**
* 查询所有用户信息
*/
@Override
public Object getAllUser() {
List query = jdbcTemplate.query("select * from userentity", new BeanPropertyRowMapper(UserEntity.class));
if (query.isEmpty()) {
return null;
}else {
return query;
}
}
/**
* 根据用户名查询用户信息(从数据库中获取用户信息)
*
* @param username 用户名称
*/
@Override
public Object findUserByName2(String username) {
List query = jdbcTemplate.query("select * from userentity where username=?", new UserEntityRowMapper(), username);
if (query.isEmpty()) {
return null;
} else if (query.size() > 1) {
throw new RuntimeException("结果集不唯一");
} else {
return query.get(0);
}
}
/**
* 查询所有用户信息
*/
@Override
public Object getAllUser2() {
List query = jdbcTemplate.query("select * from userentity", new UserEntityRowMapper());
if (query.isEmpty()) {
return null;
}else {
return query;
}
}
/**
* 根据用户名称删除用户(删除数据库中用户)
*
* @param username 用户名称
*/
@Override
public Object deleteUserByName(String username) {
String sql = "delete from userentity where username = ?";
int update = this.jdbcTemplate.update(sql, username);
if (update > 0) {
return "删除成功!!!";
}
return "删除失败!!!";
}
@Override
public Object deleteAllUser() {
String sql = "delete from userentity";
int update = this.jdbcTemplate.update(sql);
if (update > 0) {
return "删除所有用户成功!!!";
}
return "删除所有用户成功!!!";
}
}
github 地址：
- https://github.com/zhengjiaao/spring5x
博客地址
- ：https://www.jianshu.com/u/70d69269bd09
- 掘金： https://juejin.im/user/5d82daeef265da03ad14881b/posts