wuchong commented on a change in pull request #9802: [FLINK-13361][documention]
Add documentation for JDBC connector for Table API & SQL
URL: https://github.com/apache/flink/pull/9802#discussion_r332897966
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File path: docs/dev/table/connect.md
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@@ -1075,6 +1075,88 @@ CREATE TABLE MyUserTable (
{% top %}
+### JDBC Connector
+
+<span class="label label-primary">Source: Batch</span>
+<span class="label label-primary">Sink: Batch</span>
+<span class="label label-primary">Sink: Streaming Append Mode</span>
+<span class="label label-primary">Sink: Streaming Upsert Mode</span>
+<span class="label label-primary">Temporal Join: Sync Mode</span>
+
+The JDBC connector allows for reading from an JDBC client.
+The JDBC connector allows for writing into an JDBC client.
+
+The connector can operate in [upsert mode](#update-modes) for exchanging
UPSERT/DELETE messages with the external system using a [key defined by the
query](./streaming/dynamic_tables.html#table-to-stream-conversion).
+
+For append-only queries, the connector can also operate in [append
mode](#update-modes) for exchanging only INSERT messages with the external
system.
+
+To use this connector, add the following dependency to your project:
+
+{% highlight xml %}
+<dependency>
+ <groupId>org.apache.flink</groupId>
+ <artifactId>flink-connector-jdbc{{ site.scala_version_suffix }}</artifactId>
+ <version>{{site.version }}</version>
+</dependency>
+{% endhighlight %}
+
+And must also specify JDBC library, for example, if want to use Mysql library,
the following dependency to your project:
+
+{% highlight xml %}
+<dependency>
+ <groupId>mysql</groupId>
+ <artifactId>mysql-connector-java</artifactId>
+ <version>8.0.17</version>
+</dependency>
+{% endhighlight %}
+
+**Library support:** Now, we only support mysql, derby, postgres.
+
+The connector can be defined as follows:
+
+<div data-lang="DDL" markdown="1">
+{% highlight sql %}
+CREATE TABLE MyUserTable (
+ ...
+) WITH (
+ 'connector.type' = 'jdbc', -- required: specify this table type is jdbc
+
+ 'connector.url' = 'jdbc:derby:memory:upsert', -- required: JDBC DB url
+
+ 'connector.table' = 'jdbc_table_name', -- required: jdbc table name
+
+ 'connector.driver' = 'driver', -- optional: jdbc driver, if not set, it will
automatically guess based on the URL.
+
+ 'connector.username' = 'name', -- optional: jdbc user name and password
+ 'connector.password' = 'password',
+
+ -- scan options, optional, used when reading from table
+ 'connector.read.partition.column' = 'column_name', -- optional, name of the
column used for partitioning the input.
+ 'connector.read.partition.num' = '50', -- optional, the largest value of the
last partition.
+ 'connector.read.partition.lower-bound' = '500', -- optional, the smallest
value of the first partition.
+ 'connector.read.fetch-size' = '100', -- optional, the maximum number of
partitions that can be used for parallelism in table reading.
+
+ -- lookup options, optional, used in temporary join
+ 'connector.lookup.cache.max-rows' = '-1', -- optional, lookup cache max
size, over this value, the old data will be eliminated.
Review comment:
```suggestion
'connector.lookup.cache.max-rows' = '5000', -- optional, max number of
rows of lookup cache, over this value, the oldest rows will be eliminated.
"cache.max-rows" and "cache.ttl" options must all be specified if any of them
is specified. Cache is not enabled as default.
```
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