SQL to Java code for Elasticsearch

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SQL to Java code for Elasticsearch

Elasticsearch虽然定位为Search Engine,但是因其可以持久化数据,很多时候,我们把Elasticsearch当成Database用,但是Elasticsearch不支持SQL,就需要把SQL逻辑转换成代码实现对应的功能. 以下列举了一些常用的SQL转换成对应的Java代码. 1.按某个field group by查询count SELECT fieldA, COUNT(fieldA) from table WHERE fieldC = "hoge" AND fie…

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With the help of LiJun I got a piece of JAVA code. With this code, I can do below things like connect to oracle database with jdbc driver and run sql. Below are the Java code. import java.sql.Connection; import java.sql.DriverManager; import java.sql…

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