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92 lines
5.6 KiB
92 lines
5.6 KiB
2 years ago
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# 通用SQL条件
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平台使用可拓展的方式进行SQL条件构造,如: `like`,`gt`,`lt`等。
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## 平台内置SQL条件
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| termType | SQL | DSL | 说明 |
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|------------------|----------------------|--------------------------------------------------------|-------------------------------------------------------------------------------------------------------|
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| is 或者 eq | = | \.is\(\) | 等于 |
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| not | \!= | \.not\(\) | 不等于 |
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| gt | > | \.gt\(\) | 大于 |
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| lt | < | \.lt\(\) | 小于 |
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| gte | >= | \.gte\(\) | 大于等于 |
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| lte | <= | \.lte\(\) | 小于等于 |
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| like | like | \.like\(\) | 模糊匹配\. 需要自己将value拼接%\. |
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| nlike | not like | \.notLike\(\) | 同like |
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| in | in | \.in\(\) | 值可以为以下格式:1,2,3,4 字符串以半角逗号分割\. \[1,2,3,4\] 集合\.|
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| nin | not in | \.notIn\(\) | 同in |
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| isnull | is null | \.isNull\(\) | 为null |
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| notnull | not null | \.notNull\(\) | 不为null |
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| empty | = '' | \.isEmpty\(\) | 为空字符 |
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| nempty | \!='' | \.notEmpty\(\) | 不为字符 |
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| bwt | between | \.between\(\) | 在之间 |
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| nbwt | not between | \.notBetween | 不在之间 |
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| dev\-group | exists\(\.\.\.\.\.\) | \.where\("deviceId$dev\-group",groupId\) | 按设备分组查询 \(Pro\) |
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| dev\-same\-group | exists\(\.\.\.\.\.\) | \.where\("deviceId$dev\-same\-group",anotherDeviceId\) | 查询同一个分组的设备，如果要包含此设备则使用: deviceId$dev\-same\-group$contains \(Pro\) |
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| dev\-tag | exists\(\.\.\.\.\.\) | \.where\("deviceId$dev\-tag","tagKey:tagValue"\) | 按标签查询,支持格式: `key:value`,`[{"key":"tagKey","value":"tagValue"}]` |
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## 自定义SQL条件构造器
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新建一个类,继承`AbstractTermFragmentBuilder`,注解`@Component`注入到spring.
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```java
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@Component
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public class CustomTermBuilder extends AbstractTermFragmentBuilder{
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public CustomTermBuilder(){
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//custom 为条件标识,就像like一样
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super("custom","自定义查询条件");
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}
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public SqlFragments createFragments( String columnFullName, //列全名,查询条件对应的列名
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RDBColumnMetadata column, //列元数据
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Term term){ //条件
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return PrepareSqlFragments.of()
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.addSql("exists(select 1 from custom_table t where t.device_id =",columnFullName," and t.value = ?)")
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.addParameter(term.getValue());
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}
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}
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```
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## 在后端通用CRUD中使用
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```java
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repository.createQuery().where("deviceId$custom","1234").fetch();
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```
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## 在前端通用查询条件中使用
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```js
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{
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"where": "deviceId custom 1234"
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}
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```
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或者
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```js
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{
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"terms":[
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{
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"column":"deviceId",
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"termType":"custom",
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"value":"1234"
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}
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]
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}
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```
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