数据库表元数据管理与监控

1、ResultSet getColumns​ 
https://docs.oracle.com/en/java/javase/11/docs/api/java.sql/java/sql/DatabaseMetaData.html#getColumns(java.lang.String,java.lang.String,java.lang.String,java.lang.String)
https://docs.oracle.com/en/java/javase/11/docs/api/java.sql/java/sql/ResultSet.html
https://www.cnblogs.com/chenying99/archive/2012/08/17/2644500.html


2、DatabaseMetaData
https://javanotes2all.wordpress.com/2013/04/10/how-do-i-use-databasemetadata-to-get-table-column-details/comment-page-1/
https://docs.oracle.com/javase/8/docs/api/java/sql/DatabaseMetaData.html
<1> getTables方法 : https://sjsky.iteye.com/blog/1119394

<2> mysql库无法获取remark信息
https://huqiji.iteye.com/blog/2205161
https://blog.csdn.net/xindeyitia/article/details/84919714

<3> 获取列的详细信息(列名、类型、大小、注释等)
http://www.java2s.com/Code/Java/Database-SQL-JDBC/GetColumnDetailInformation.htm


3、关系型数据库，采集元数据demo
https://dzone.com/articles/listing-schematablecolumn

4、Oracle
当前用户下的视图
https://docs.oracle.com/cd/B19306_01/server.102/b14237/statviews_2117.htm#REFRN20305
注释信息
https://docs.oracle.com/cd/B28359_01/server.111/b28320/statviews_1036.htm#REFRN20040
https://blog.csdn.net/fendou_0123456789/article/details/80980054
　　
5、ElasticSearch 元数据信息
https://stackoverflow.com/questions/25349947/how-to-find-index-by-alias-in-elasticsearch-java-api