Springboot+Mybatis+SQLite

时人莫小池中水，浅处无妨有卧龙。——唐·窦庠《醉中赠符载》

之前写过一个springboot的小项目

现在又在往里加东西啦！

之前没有对数据库添加支持，今天就往里整合SQLite吧！

首先先引入依赖

<!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.3</version>
</dependency>

<!-- sqlite驱动 -->
<!-- https://mvnrepository.com/artifact/org.xerial/sqlite-jdbc -->
<dependency>
    <groupId>org.xerial</groupId>
    <artifactId>sqlite-jdbc</artifactId>
    <version>3.32.3.2</version>
</dependency>

然后添加配置文件

spring:
  datasource:
    url: jdbc:sqlite:data.db
    driver-class-name: org.sqlite.JDBC

这个url配置可以参照我之前这篇SQLite入门のjava创建库表

当时创建的data.db文件在哪，这里就写哪

然后就开始写吧

创建Dao接口

package com.ruben.dao;

import com.ruben.pojo.User;
import org.apache.ibatis.annotations.*;

import java.util.List;

/**
 * @ClassName: UserDao
 * @Date: 2020/10/11 0011 13:24
 * @Description:
 */
@Mapper
public interface UserDao {

    @SelectProvider(type = UserMapper.class, method = "findUserByCondition")
    User findUserByCondition(User user);

    @InsertProvider(type = UserMapper.class, method = "insertUser")
    int insertUser(User user);
    
}

然后是Mapper

package com.ruben.dao;

import com.aliyuncs.utils.StringUtils;
import com.ruben.pojo.User;
import com.ruben.utils.StringUtil;
import org.apache.ibatis.jdbc.SQL;
import org.thymeleaf.expression.Lists;

import java.util.ArrayList;
import java.util.List;

/**
 * @ClassName: UserMapper
 * @Date: 2020/10/11 0011 13:26
 * @Description:
 */
public class UserMapper {
    public String findUserByCondition(User user) {
        SQL sql = new SQL();
        sql.SELECT("id,username,password");
        sql.FROM("user");
        if (user.getId() != null) {
            sql.WHERE("id=#{id}");
        } else if (StringUtils.isNotEmpty(user.getUsername())) {
            sql.WHERE("username=#{username}");
        }
        return sql.toString();
    }

    public String insertUser(User user) {
        SQL sql = new SQL();
        sql.INSERT_INTO("user");
        sql.VALUES("id,username,password", "#{id},#{username},#{password}");
        return sql.toString();
    }
}

SQLite入门就是这么简单…

然后把原来的假数据替换成真数据

@Override
public User getUserByUsername(String username) {
    User condition = new User();
    condition.setUsername(username);
    //从缓存中获取，获取不到再从数据库中获取
    String userJson = (String) stringRedisTemplate
            .opsForHash()
            .get(UserConstant.USER_CACHE,
                    UserConstant.LOGIN_USER_PRE + username);
    if (StringUtils.isEmpty(userJson)) {
        //从数据库中获取
        return userDao.findUserByCondition(condition);
    }
    return JSON.parseObject(userJson, User.class);
}

@Override
public User createUser(User user) {
    // 密码加密
    String password = Encrypt.SHA512(UserConstant.SALT + user.getUsername() + user.getPassword());
    user.setId(new Long(System.currentTimeMillis()).intValue());
    user.setPassword(password);
    try {
        int affect = userDao.insertUser(user);
        if (affect != 1) {
            return null;
        }
        return user;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

@Override
public User findUserByUsername(String username) {
    User user = new User();
    user.setUsername(username);
    return userDao.findUserByCondition(user);
}

@Override
@Transactional
public String register(User user) {
    // 密码加密
    String password = Encrypt.SHA512(UserConstant.SALT + user.getUsername() + user.getPassword());
    user.setId(new Long(System.currentTimeMillis()).intValue());
    user.setPassword(password);
    try {
        // 插入用户
        int affect = userDao.insertUser(user);
        if (affect != 1) {
            return "添加用户失败";
        }
    } catch (Exception e) {
        e.printStackTrace();
        return "添加用户失败";
    }
    return null;
}