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README
Apache-2.0

SmartDb 卓大观点

【卓大观点】互联网已经发展了二十年,每个企业均有一定的数字化发展,但随着“产业互联网”,“新基建”,“国产数据库”,“国产开源框架”等时代的到来,越来越多的企业在原有数字化(原有各类数据库)的基础之上,需要再向上构建一层新的数据聚合,以此来适应产业互联网的发展需要。所以当下的系统都会在原有数据库基础之上连接其他两个、甚至多个数据库,故一个支持多数据库、多数据源且轻量级的java数据库中间件是及其需要的!

所以必须有一个能5分钟上手,就可以完美解决多数据库、多数据源问题的框架
由此河南·洛阳 1024创新实验室团队研发了一个轻量级的ORM框架

SmartDb特点

mybatis现在在国内已经是一家独大,而且也非常好用,笔者也推荐在大型项目中使用mybatis这种框架,但是总有一些场景,mybatis显得有些力不从心,这个时候选择SmartDb是一个不错的选择。

  • 在原有mybatis或hibernate连接其他数据库进行一些数据处理
  • 读写分离场景,有些数据需要操作主库,有些操作从库
  • 多数据源场景,要从mysql读出数据,然后进行转换存储到sqlserver中,等等
  • 在一个方法中进行多个数据源的数据库操作
  • 一个简单并追求开发效率的小型项目,例如 SmartBlog(卓大的官方博客)
  • 不想使用sharding-sphere,sharding-jdbc, mycat,cobar等重型读写分离框架
  • 等等其他

基于以上种种,设计了一个支持多数据源、读写分离的轻量级ORM框架:SmartDb, 让使用者有个极致的开发体验。

SmartDb简介

SmartDb 是以SQL为中心,支持多数据源、读写分离,同时又不与原有项目mybatis、hibernate冲突的非常轻量级的Java ORM框架。

特性如下:

  • 支持ORM操作、常见增删改查、批量、分页等功能
  • 支持MySQL、Oracle、Postgresql、SqlServer
  • 支持在mybatis、hibernate等项目上引入SmartDb
  • 支持多数据源
  • 支持分写分离
  • 支持枚举Enum映射
  • 支持Spring和Spring事务
  • 支持SQL链式API
  • 支持代码生成
  • 支持 filter 过滤器
  • 所有类均可扩展
  • 支持Java 6 (默认支持java8,如需要支持java6,请添加微信)

SmartDb 文档

github: https://github.com/1024-lab/smartdb

gitee: https://gitee.com/lab1024/smartdb

官方文档: https://zhuoda.vip/smartdb

例子: https://gitee.com/lab1024/smartdb-demos

SmartDb演示

SmartDb POM

<dependency>
  <groupId>net.1024lab</groupId>
  <artifactId>smartdb</artifactId>
  <version>1.2.0</version>
</dependency>

SmartDb 操作多数据源

在一个方法中操作多个数据库,不用再使用注解切换来切换去,还不容易出错, oh yeah~

public void multiDatasource(UserEntity userEntity) {
    // mysqlSmartDb 对象为 连接SqlServer的SmartDb
    SmartDb mysqlSmartDb = build1(); 
    // sqlServerSmartDb 对象为 连接SqlServer的SmartDb
    SmartDb sqlServerSmartDb = build2();
    // 将数据插入mysql数据库
    mysqlSmartDb.insert(userEntity);
    // 将数据插入sql server数据库
    sqlServerSmartDb.insert(userEntity);
}

SmartDb ORM操作

支持简单的orm操作

UserEntity userEntity = new UserEntity(1, "zhuoda");
// 插入
smartDb.insert(userEntity);
smartDb.insertSelective(userEntity); // 非空字段插入
smartDb.batchInsert(userList);//批量插入
// 更新
smartDb.update(userEntity);  
smartDb.updateSelective(userEntity); // 非空字段更新
// 删除
smartDb.delete(userEntity);//根据主键删除

SmartDb 读写分离操作

//默认操作 都是操作从库
List<UserEntity> userList = smartDb.selectSqlBuilder()
        .select("*")
        .from(UserEntity.class)
        .queryList(UserEntity.class);

//获取写库
SmartDb writeSmartDb = smartDb.getMaster();
//将数据写入主库
writeSmartDb.insert(userEntity);
//进行主库其他操作
writeSmartDb.delete(userEntity);
writeSmartDb.updateSelective(userEntity);

SmartDb 链式Builder操作

smartdb为了支持快速开发,支持增删查改四种链式Builder操作

SmartDb 链式SelectBuilder操作

支持and、or、in、like、group、having、limit等等

UserEntity userEntity = smartDb.selectSqlBuilder()
        .select("user.*")
        .select("score.*")
        .from(UserEntity.class)
        .joinLeft("t_score on t_user.id = t_score.user_id")
        .whereAnd("user.id = ?", 1)
        .whereAnd("type = 3")
        .whereAndIn(" status ", Arrays.asList(1, 2, 3))
        .groupby("user.type")
        .havingAnd("user.type = 1")
        .queryFirst(UserEntity.class);
SmartDb 链式InsertBuilder操作
smartDb.insertSqlBuilder()
        .table("t_user")
        .insertColumn("id",1)
        .insertColumn("name","smartdb")
        .insertFunctionColumn("login_time","now()") //sql方法
        .execute();
SmartDb 链式UpdateBuilder操作

更新操作支持and、or、in、like、等等

smartDb.updateSqlBuilder()
        .table("t_user")
        .updateColumn("name = ?","smart")
        .updateColumn(" login_time = now()")
        .whereAnd("id = 1")
        .execute();
SmartDb 链式DeleteBuilder操作

更新操作支持and、or、in、like、等等

smartDb.deleteSqlBuilder()
        .table("t_user")
        .whereAnd("id = 1")
        .execute();
SmartDb 链式ReplaceBuilder操作
smartDb.replaceSqlBuilder()
        .table("t_user")
        .replaceColumn("id",1)
        .replaceColumn("name","smartdb")
        .replaceFunctionColumn("login_time","now()")
        .execute();

创建 SmartDb

SmartDb smartDb = 
	SmartDbBuilder.create()
	//设置 写库 数据源
	.setMasterDataSource(writeDataSource)
	//设置 两个读库 数据源
	.setSlaveDataSource(readDataSource1,readDataSource2)
	// 打印 info 级别sql
	.setShowSql(true)
	//设置数据库类型
	.setSupportDatabaseType(SupportDatabaseType.MYSQL)
	//设置支持spring
	.setSmartDbExtEnum(SmartDbExtEnum.SPRING5)
	//表名与类名转换
	.setTableNameConverter(cls -> "t_" + CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, cls.getSimpleName()))
	//列名字 转换
	.setColumnNameConverter(new CaseFormatColumnNameConverter(CaseFormat.LOWER_CAMEL, CaseFormat.LOWER_UNDERSCORE))
	.build();

SmartDb 文档

官方文档: https://zhuoda.vip/smartdb

例子: https://gitee.com/lab1024/smartdb-demos


联系我们 :

1024创新实验室

SmartDb微信交流群(加我微信拉你入群,和小伙伴们一起探讨!

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开源不易,感谢捐赠

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作者简介: 卓大, 1024创新实验室主任,混迹于各个技术圈,研究过计算机,熟悉点java,略懂点前端。

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简介

SmartDb是以SQL为中心,支持多数据库、多数据源、读写分离,同时又不与原有项目mybatis、hibernate冲突的非常轻量级的Java ORM框架。只需5分钟上手,就可以完美解决多数据源问题。 展开 收起
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