ES elasticsearch 6.3.0的sql功能简单试用

安装ES6.3.0 之前文章已经安装过，请看之前的安装

因为6.3.0自带了SQL工具，一起安装的，安装目录的bin下面，

这样记动，bin/elasticsearch-sql-cli

如下图所示，就是启动成功

用sql 命令简单的查询一下数据，不过是第一版本的SQL功能支持，可能对于嵌套的查询支持不是很友好

sql> select * from java_demo_index where prodId>6 order by prodId desc
   | ;
     catId     |match.prodName |   prodDesc    |    prodId     |   prodName    |query.match.prodName
---------------+---------------+---------------+---------------+---------------+--------------------
6              |null           |智能手机3          |8              |iphone8s       |null                
6              |null           |智能手机3          |7              |iphone8s       |null

第二方式直接请求等到数据

注意后面的参数 _xpack/sql?format=txt" -d 后面加单引号‘’ 数据体其中format=txt 文本方式输出，还可以用JSON方式输出

format=json 其他的格式支持包括：yaml、smile、cbor 、txt、csv、tsv等等，我们可以通过 format 参数指定。

curl -X POST "http://192.168.11.237:9200/_xpack/sql?format=txt" -H 'Content-Type: application/json' -d'
{
    "query": "SELECT * FROM java_demo_index ORDER BY prodId  DESC LIMIT 5"
};

     catId     |match.prodName |   prodDesc    |    prodId     |   prodName    |query.match.prodName
---------------+---------------+---------------+---------------+---------------+--------------------
6              |null           |智能手机3          |8              |iphone8s       |null                
6              |null           |智能手机3          |7              |iphone8s       |null                
6              |null           |智能手机           |6              |iphone6s       |null                
6              |null           |智能手机3          |6              |iphone8s       |null                
6              |null           |智能手机3          |5              |iphone8s       |null

下面以JSON方式输出

[root@p7 /]# curl -X POST "http://192.168.11.237:9200/_xpack/sql?format=json" -H 'Content-Type: application/json' -d'
{
    "query": "SELECT * FROM java_demo_index ORDER BY prodId  DESC LIMIT 5"
> }'
{"columns":[
{"name":"catId","type":"text"},{"name":"match.prodName","type":"text"},{"name":"prodDesc","type":"text"},{"name":"prodId","type":"text"},{"name":"prodName","type":"text"},{"name":"query.match.prodName","type":"text"}],"rows":[["6",null,"智能手机3","8","iphone8s",null],["6",null,"智能手机3","7","iphone8s",null],["6",null,"智能手机","6","iphone6s",null],["6",null,"智能手机3","6","iphone8s",null],["6",null,"智能手机3","5","iphone8s",null]
]}

第三种方式 SQL JDBC

String address = "jdbc:es://" + elasticsearchAddress;

Properties connectionProperties = connectionProperties();

Connection connection = DriverManager.getConnection(address, connectionProperties);

try (Statement statement = connection.createStatement();

ResultSet results = statement.executeQuery(

"SELECT name, page_count FROM library ORDER BY page_count DESC LIMIT 1")) {

assertTrue(results.next());

assertEquals("Don Quixote", results.getString(1));

assertEquals(1072, results.getInt(2));

SQLException e = expectThrows(SQLException.class, () -> results.getInt(1));

assertTrue(e.getMessage(), e.getMessage().contains("unable to convert column 1 to an int"));

assertFalse(results.next());

}

具体的实现方式参考如下

https://www.elastic.co/guide/en/elasticsearch/reference/master/sql-jdbc.html

另外用插件访问，用sql查询，有些还是不能用

SQL转DLS 方式访问

http://192.168.11.237:9200/_xpack/sql/translate/

{"query":"SELECT * FROM java_demo_index ORDER BY prodId DESC LIMIT 5"}

如果如下，后续再接着研究

ES elasticsearch 6.3.0的sql功能简单试用

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