SQL JDBC | ElasticSearch 7.7 权威指南中文版

原英文版地址: https://www.elastic.co/guide/en/elasticsearch/reference/7.7/sql-jdbc.html, 原文档版权归 www.elastic.co 所有
本地英文版地址: ../en/sql-jdbc.html

重要: 此版本不会发布额外的bug修复或文档更新。最新信息请参考当前版本文档。

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SQL JDBCedit

Elasticsearch’s SQL jdbc driver is a rich, fully featured JDBC driver for Elasticsearch. It is Type 4 driver, meaning it is a platform independent, stand-alone, Direct to Database, pure Java driver that converts JDBC calls to Elasticsearch SQL.

Installationedit

The JDBC driver can be obtained from:

Dedicated page: elastic.co provides links, typically for manual downloads.
Maven dependency: Maven-compatible tools can retrieve it automatically as a dependency:

<dependency>
  <groupId>org.elasticsearch.plugin</groupId>
  <artifactId>x-pack-sql-jdbc</artifactId>
  <version>7.7.1</version>
</dependency>

from artifacts.elastic.co/maven by adding it to the repositories list:

<repositories>
  <repository>
    <id>elastic.co</id>
    <url>https://artifacts.elastic.co/maven</url>
  </repository>
</repositories>

Setupedit

The driver main class is org.elasticsearch.xpack.sql.jdbc.EsDriver. Note the driver implements the JDBC 4.0 Service Provider mechanism meaning it is registered automatically as long as it is available in the classpath.

Once registered, the driver understands the following syntax as an URL:

jdbc:es://[[http|https]://]?[host[:port]]?/[prefix]?[\?[option=value]&]*

jdbc:es://: Prefix. Mandatory.
[[http|https]://]: Type of HTTP connection to make. Possible values are http (default) or https. Optional.
[host[:port]]: Host (localhost by default) and port (9200 by default). Optional.
[prefix]: Prefix (empty by default). Typically used when hosting Elasticsearch under a certain path. Optional.
[option=value]: Properties for the JDBC driver. Empty by default. Optional.

The driver recognized the following properties:

Essentialedit

timezone (default JVM timezone): Timezone used by the driver per connection indicated by its ID. Highly recommended to set it (to, say, UTC) as the JVM timezone can vary, is global for the entire JVM and can’t be changed easily when running under a security manager.

Networkedit

connect.timeout (default 30s): Connection timeout (in seconds). That is the maximum amount of time waiting to make a connection to the server.
network.timeout (default 60s): Network timeout (in seconds). That is the maximum amount of time waiting for the network.
page.timeout (default 45s): Page timeout (in seconds). That is the maximum amount of time waiting for a page.
page.size (default 1000): Page size (in entries). The number of results returned per page by the server.
query.timeout (default 90s): Query timeout (in seconds). That is the maximum amount of time waiting for a query to return.

Basic Authenticationedit

user: Basic Authentication user name
password: Basic Authentication password

SSLedit

ssl (default false): Enable SSL
ssl.keystore.location: key store (if used) location
ssl.keystore.pass: key store password
ssl.keystore.type (default JKS): key store type. PKCS12 is a common, alternative format
ssl.truststore.location: trust store location
ssl.truststore.pass: trust store password
ssl.truststore.type (default JKS): trust store type. PKCS12 is a common, alternative format
ssl.protocol(default TLS): SSL protocol to be used

Proxyedit

proxy.http: Http proxy host name
proxy.socks: SOCKS proxy host name

Mappingedit

field.multi.value.leniency (default true): Whether to be lenient and return the first value (without any guarantees of what that will be - typically the first in natural ascending order) for fields with multiple values (true) or throw an exception.

Indexedit

index.include.frozen (default false): Whether to include frozen-indices in the query execution or not (default).

Additionaledit

validate.properties (default true): If disabled, it will ignore any misspellings or unrecognizable properties. When enabled, an exception will be thrown if the provided property cannot be recognized.

To put all of it together, the following URL:

jdbc:es://http://server:3456/?timezone=UTC&page.size=250

Opens up a Elasticsearch SQL connection to server on port 3456, setting the JDBC connection timezone to UTC and its pagesize to 250 entries.

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