棄用 Mybatis，自研一款輕量級、高性能、強類型的 ORM 框架
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2024-06-22 14:43
來源：juejin.cn/post/7294908459002429475
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背景
轉(zhuǎn)java后的幾年時間里面一直在尋找一個類似.net的orm，不需要很特別的功能，僅希望90%的場景都可以通過強類型語法來編寫符合直覺的sql，來操作數(shù)據(jù)庫編寫業(yè)務(wù)。
但是一直沒有找到，Mybatis-Plus的單表讓我在最初的時間段內(nèi)看到了希望，不過隨著使用的深入越發(fā)的覺得Mybatis-Plus只是一個殘缺的orm，因為大部分場景不支持表達(dá)式或者強類型會導(dǎo)致它本身的很多特性都無法使用，比如你配置了軟刪除，那么如果你遇到了join不好意思軟刪除你需要自己處理，很多配置會隨著手寫sql的加入變的那么的不智能，甚至表現(xiàn)得和sql helper沒區(qū)別。
別說Mybatis-Plus-Join了，這玩意更逆天，如果一個orm想寫出符合自己的sql，需要不斷地調(diào)試嘗試來“拼接”出想要的語句，那么他就稱不上一個ORM，連sql builder也算不上。Mybatis-Plus-Join就是這樣。
所以在4-5年后我終于忍受不了了，決定自研一款orm。參考現(xiàn)有.net生態(tài)十分完整的orm代碼和幾乎完美符合擴展性和語義性的鏈?zhǔn)奖磉_(dá)式，讓.net的orm帶到j(luò)ava中。
查詢
查詢第一條數(shù)據(jù)
Topic topic = easyQuery.queryable(Topic.class)
.where(o -> o.eq(Topic::getId, "123"))
.firstOrNull();
==> Preparing: SELECT `id`,`stars`,`title`,`create_time` FROM `t_topic` WHERE `id` = ? LIMIT 1
==> Parameters: 123(String)
<== Time Elapsed: 2(ms)
<== Total: 0
查詢并斷言至多一條數(shù)據(jù)
Topic topic = easyQuery.queryable(Topic.class)
.where(o -> o.eq(Topic::getId, "123"))
.singleOrNull();
==> Preparing: SELECT `id`,`stars`,`title`,`create_time` FROM `t_topic` WHERE `id` = ?
==> Parameters: 123(String)
<== Time Elapsed: 2(ms)
<== Total: 0
查詢多條數(shù)據(jù)
List<Topic> topics = easyQuery.queryable(Topic.class)
.where(o -> o.eq(Topic::getId, "123"))
.toList();
==> Preparing: SELECT `id`,`stars`,`title`,`create_time` FROM `t_topic` WHERE `id` = ?
==> Parameters: 123(String)
<== Time Elapsed: 2(ms)
<== Total: 0
查詢自定義列
Topic topic = easyQuery.queryable(Topic.class)
.where(o -> o.eq(Topic::getId, "1"))
.select(o->o.column(Topic::getId).column(Topic::getTitle))
.firstOrNull();
==> Preparing: SELECT `id`,`title` FROM `t_topic` WHERE `id` = ? LIMIT 1
==> Parameters: 1(String)
<== Time Elapsed: 2(ms)
<== Total: 1
分頁查詢
EasyPageResult<Topic> topicPageResult = easyQuery
.queryable(Topic.class)
.where(o -> o.isNotNull(Topic::getId))
.toPageResult(1, 20);
==> Preparing: SELECT COUNT(1) FROM t_topic t WHERE t.`id` IS NOT NULL
<== Total: 1
==> Preparing: SELECT t.`id`,t.`stars`,t.`title`,t.`create_time` FROM t_topic t WHERE t.`id` IS NOT NULL LIMIT 20
<== Total: 20
將表達(dá)式轉(zhuǎn)成匿名表嵌套查詢
// SELECT `id`,`title` FROM `t_topic` WHERE `id` = ?
Queryable<Topic> query = easyQuery.queryable(Topic.class)
.where(o -> o.eq(Topic::getId, "1"))
.select(Topic.class, o -> o.column(Topic::getId).column(Topic::getTitle));
List<Topic> list = query.leftJoin(Topic.class, (t, t1) -> t.eq(t1, Topic::getId, Topic::getId))
.where((t, t1) -> {
t1.eq(Topic::getId, "123");
t.eq(Topic::getId, "456");
}).toList();
SELECT t1.`id`,t1.`title`
FROM (SELECT t.`id`,t.`title` FROM `t_topic` t WHERE t.`id` = ?) t1
LEFT JOIN `t_topic` t2 ON t1.`id` = t2.`id` WHERE t2.`id` = ? AND t1.`id` = ?
==> Preparing: SELECT t1.`id`,t1.`title` FROM (SELECT t.`id`,t.`title` FROM `t_topic` t WHERE t.`id` = ?) t1 LEFT JOIN `t_topic` t2 ON t1.`id` = t2.`id` WHERE t2.`id` = ? AND t1.`id` = ?
==> Parameters: 1(String),123(String),456(String)
<== Time Elapsed: 5(ms)
<== Total: 0
子查詢
//SELECT * FROM `t_blog` t1 WHERE t1.`deleted` = ? AND t1.`id` = ?
Queryable<BlogEntity> subQueryable = easyQuery.queryable(BlogEntity.class)
.where(o -> o.eq(BlogEntity::getId, "1"));
List<Topic> x = easyQuery
.queryable(Topic.class).where(o -> o.exists(subQueryable.where(q -> q.eq(o, BlogEntity::getId, Topic::getId)))).toList();
==> Preparing: SELECT t.`id`,t.`stars`,t.`title`,t.`create_time` FROM `t_topic` t WHERE EXISTS (SELECT 1 FROM `t_blog` t1 WHERE t1.`deleted` = ? AND t1.`id` = ? AND t1.`id` = t.`id`)
==> Parameters: false(Boolean),1(String)
<== Time Elapsed: 3(ms)
<== Total: 1
多表join查詢
Topic topic = easyQuery
.queryable(Topic.class)
.leftJoin(BlogEntity.class, (t, t1) -> t.eq(t1, Topic::getId, BlogEntity::getId))
.where(o -> o.eq(Topic::getId, "3"))
.firstOrNull();
==> Preparing: SELECT t.`id`,t.`stars`,t.`title`,t.`create_time` FROM t_topic t LEFT JOIN t_blog t1 ON t1.`deleted` = ? AND t.`id` = t1.`id` WHERE t.`id` = ? LIMIT 1
==> Parameters: false(Boolean),3(String)
<== Total: 1
流式結(jié)果大數(shù)據(jù)迭代返回
try(JdbcStreamResult<BlogEntity> streamResult = easyQuery.queryable(BlogEntity.class).where(o -> o.le(BlogEntity::getStar, 100)).orderByAsc(o -> o.column(BlogEntity::getCreateTime)).toStreamResult()){
LocalDateTime begin = LocalDateTime.of(2020, 1, 1, 1, 1, 1);
int i = 0;
for (BlogEntity blog : streamResult.getStreamIterable()) {
String indexStr = String.valueOf(i);
Assert.assertEquals(indexStr, blog.getId());
Assert.assertEquals(indexStr, blog.getCreateBy());
Assert.assertEquals(begin.plusDays(i), blog.getCreateTime());
Assert.assertEquals(indexStr, blog.getUpdateBy());
Assert.assertEquals(begin.plusDays(i), blog.getUpdateTime());
Assert.assertEquals("title" + indexStr, blog.getTitle());
// Assert.assertEquals("content" + indexStr, blog.getContent());
Assert.assertEquals("http://blog.easy-query.com/" + indexStr, blog.getUrl());
Assert.assertEquals(i, (int) blog.getStar());
Assert.assertEquals(0, new BigDecimal("1.2").compareTo(blog.getScore()));
Assert.assertEquals(i % 3 == 0 ? 0 : 1, (int) blog.getStatus());
Assert.assertEquals(0, new BigDecimal("1.2").multiply(BigDecimal.valueOf(i)).compareTo(blog.getOrder()));
Assert.assertEquals(i % 2 == 0, blog.getIsTop());
Assert.assertEquals(i % 2 == 0, blog.getTop());
Assert.assertEquals(false, blog.getDeleted());
i++;
}
} catch (SQLException e) {
throw new RuntimeException(e);
}
==> Preparing: SELECT `id`,`create_time`,`update_time`,`create_by`,`update_by`,`deleted`,`title`,`content`,`url`,`star`,`publish_time`,`score`,`status`,`order`,`is_top`,`top` FROM `t_blog` WHERE `deleted` = ? AND `star` <= ? ORDER BY `create_time` ASC
==> Parameters: false(Boolean),100(Integer)
<== Time Elapsed: 6(ms)
自定義VO返回
List<QueryVO> list = easyQuery
.queryable(Topic.class)
//第一個join采用雙參數(shù),參數(shù)1表示第一張表Topic 參數(shù)2表示第二張表 BlogEntity
.leftJoin(BlogEntity.class, (t, t1) -> t.eq(t1, Topic::getId, BlogEntity::getId))
//第二個join采用三參數(shù),參數(shù)1表示第一張表Topic 參數(shù)2表示第二張表 BlogEntity 第三個參數(shù)表示第三張表 SysUser
.leftJoin(SysUser.class, (t, t1, t2) -> t.eq(t2, Topic::getId, SysUser::getId))
.where(o -> o.eq(Topic::getId, "123"))//單個條件where參數(shù)為主表Topic
//支持單個參數(shù)或者全參數(shù),全參數(shù)個數(shù)為主表+join表個數(shù) 鏈?zhǔn)綄懛ㄆ陂g可以通過then來切換操作表
.where((t, t1, t2) -> t.eq(Topic::getId, "123").then(t1).like(BlogEntity::getTitle, "456")
.then(t2).eq(BaseEntity::getCreateTime, LocalDateTime.now()))
//如果不想用鏈?zhǔn)降?span style="color: #c678dd;line-height: 26px;">then來切換也可以通過lambda 大括號方式執(zhí)行順序就是代碼順序,默認(rèn)采用and鏈接
.where((t, t1, t2) -> {
t.eq(Topic::getId, "123");
t1.like(BlogEntity::getTitle, "456");
t1.eq(BaseEntity::getCreateTime, LocalDateTime.now());
})
.select(QueryVO.class, (t, t1, t2) ->
//將第一張表的所有屬性的列映射到vo的列名上,第一張表也可以通過columnAll將全部字段映射上去
// ,如果后續(xù)可以通過ignore方法來取消掉之前的映射關(guān)系
t.column(Topic::getId)
.then(t1)
//將第二張表的title字段映射到VO的field1字段上
.columnAs(BlogEntity::getTitle, QueryVO::getField1)
.then(t2)
//將第三張表的id字段映射到VO的field2字段上
.columnAs(SysUser::getId, QueryVO::getField2)
).toList();
表單條件動態(tài)查詢
BlogQuery2Request query = new BlogQuery2Request();
query.setContent("標(biāo)題");
query.setPublishTimeEnd(LocalDateTime.now());
query.setStatusList(Arrays.asList(1,2));
List<BlogEntity> queryable = easyQuery.queryable(BlogEntity.class)
.whereObject(query).toList();
==> Preparing: SELECT `id`,`create_time`,`update_time`,`create_by`,`update_by`,`deleted`,`title`,`content`,`url`,`star`,`publish_time`,`score`,`status`,`order`,`is_top`,`top` FROM `t_blog` WHERE `deleted` = ? AND `content` LIKE ? AND `publish_time` <= ? AND `status` IN (?,?)
==> Parameters: false(Boolean),%標(biāo)題%(String),2023-07-14T22:37:47.880(LocalDateTime),1(Integer),2(Integer)
<== Time Elapsed: 2(ms)
<== Total: 0
基本類型結(jié)果返回
List<String> list = easyQuery.queryable(Topic.class)
.where(o -> o.eq(Topic::getId, "1"))
.select(String.class, o -> o.column(Topic::getId))
.toList();
==> Preparing: SELECT t.`id` FROM `t_topic` t WHERE t.`id` = ?
==> Parameters: 1(String)
<== Time Elapsed: 2(ms)
<== Total: 1
分組查詢
List<TopicGroupTestDTO> topicGroupTestDTOS = easyQuery.queryable(Topic.class)
.where(o -> o.eq(Topic::getId, "3"))
.groupBy(o->o.column(Topic::getId))
.select(TopicGroupTestDTO.class, o->o.columnAs(Topic::getId,TopicGroupTestDTO::getId).columnCount(Topic::getId,TopicGroupTestDTO::getIdCount))
.toList();
==> Preparing: SELECT t.`id` AS `id`,COUNT(t.`id`) AS `idCount` FROM t_topic t WHERE t.`id` = ? GROUP BY t.`id`
==> Parameters: 3(String)
<== Total: 1
//groupKeysAs快速選擇并且給別名
List<TopicGroupTestDTO> topicGroupTestDTOS = easyQuery.queryable(Topic.class)
.where(o -> o.eq(Topic::getId, "3"))
.groupBy(o->o.column(Topic::getId))
.select(TopicGroupTestDTO.class, o->o.groupKeysAs(0, TopicGroupTestDTO::getId).columnCount(Topic::getId,TopicGroupTestDTO::getIdCount))
.toList();
==> Preparing: SELECT t.`id` AS `id`,COUNT(t.`id`) AS `idCount` FROM t_topic t WHERE t.`id` = ? GROUP BY t.`id`
==> Parameters: 3(String)
<== Total: 1
原生sql片段
String sql = easyQuery.queryable(H2BookTest.class)
.where(o -> o.sqlNativeSegment("regexp_like({0},{1})", it -> it.expression(H2BookTest::getPrice)
.value("^Ste(v|ph)en$")))
.select(o -> o.columnAll()).toSQL();
SELECT id,name,edition,price,store_id FROM t_book_test WHERE regexp_like(price,?)
數(shù)據(jù)庫函數(shù)列
用戶存儲的數(shù)據(jù)是base64結(jié)果，但是內(nèi)存中是普通的字符串或者其他數(shù)據(jù)，easy-query提供了無感的使用，譬如pgsql的geo等地理相關(guān)數(shù)據(jù)
數(shù)據(jù)庫函數(shù)列：
?
https://xuejm.gitee.io/easy-query-doc/guide/adv/column-sql-func-auto.html
?
支持like的高性能加密解密
用來實現(xiàn)支持like模式的高性能加密解密，支持emoji和非emoji兩種用戶可以自行選擇
更多功能比如數(shù)據(jù)追蹤差異更新，數(shù)據(jù)原子更新，分庫分表(老行當(dāng)了肯定要支持)，一款本無依賴雙語(java/kotlin)都支持的高性能orm
github地址：
https://github.com/dromara/easy-query
gitee地址：
https://gitee.com/xuejm/easy-query
?? 歡迎加入小哈的星球，你將獲得: 專屬的項目實戰(zhàn) / 1v1 提問 / Java 學(xué)習(xí)路線 / 學(xué)習(xí)打卡 / 每月贈書 / 社群討論
新項目:《從零手?jǐn)]：仿小紅書（微服務(wù)架構(gòu)）》 正在持續(xù)爆肝中，基于 Spring Cloud Alibaba + Spring Boot 3.x + JDK 17..., 點擊查看項目介紹； 《從零手?jǐn)]：前后端分離博客項目（全棧開發(fā)）》 2期已完結(jié),演示鏈接：http://116.62.199.48/; 截止目前，累計輸出 47w+ 字，講解圖 2090+ 張，還在持續(xù)爆肝中.. 后續(xù)還會上新更多項目，目標(biāo)是將 Java 領(lǐng)域典型的項目都整一波，如秒殺系統(tǒng), 在線商城, IM 即時通訊，Spring Cloud Alibaba 等等，戳我加入學(xué)習(xí)，已有1600+小伙伴加入(早鳥價超低)
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