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[hotfix][build & docs] Update version to 4.1-SNAPSHOT and update docs #167

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This PR updates version to 4.1-SNAPSHOT and updates docs.

@@ -38,12 +38,27 @@ The JDBC sink operate in upsert mode for exchange UPDATE/DELETE messages with th
Dependencies
------------

When using the JDBC connector, `flink-connector-jdbc-core`, `flink-connector-jdbc-${database}` and the JDBC driver needs to be added to the dependencies.
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@davidradl davidradl May 7, 2025

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nit: needs -> need
nit2:
Is this accurate?
If I want to connect to Derby I need the flink-connector-jdbc-core and the Derby driver.
If I want to connect to DB2 I need the Derby artifact flink-connector-jdbc-coreand the DB2 driver. I assume I do not need the Derby driver.

It might be clearer to say something like. The flink-connector-jdbc-core contains core JDBC capability, it also has built in support for Derby. To use another database , you need to supply it's flink-connector-jdbc-${database} from the same Flink JDBC connector release and the associated JDBC driver.

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I tried the postgres connector and it does not need the jdbc-core .3.30-1.20 from what I see. The jdbc-core and connector-base are transitive depebdencies, at least for lookup joins. I am also willing to fix the comments here if you are busy @ruanhang1993

See how to link with it for cluster execution [here]({{< ref "docs/dev/configuration/overview" >}}).
The `flink-connector-jdbc-${database}` dependency and a driver dependency are required to connect to a specified database.

The `flink-connector-jdbc-${database}` dependencies are as follows, whose version should be the same as the `flink-connector-jdbc-core`:
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nit: when we say whose version it is not obvious what we mean. I suggest moving it up as per my last comment.


A driver dependency is also required to connect to a specified database. Here are drivers currently supported:
Here are drivers currently supported:
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nit: Here are drivers -> Here are the drivers

@@ -58,7 +73,8 @@ A driver dependency is also required to connect to a specified database. Here ar
| OceanBase | `com.oceanbase` | `oceanbase-client` | [Download](https://repo1.maven.org/maven2/com/oceanbase/oceanbase-client/) |


JDBC connector and drivers are not part of Flink's binary distribution. See how to link with them for cluster execution [here]({{< ref "docs/dev/configuration/overview" >}}).
JDBC connector and drivers are not part of Flink's binary distribution.
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nit: JDBC connector -> The JDBC connector

@@ -58,7 +73,8 @@ A driver dependency is also required to connect to a specified database. Here ar
| OceanBase | `com.oceanbase` | `oceanbase-client` | [Download](https://repo1.maven.org/maven2/com/oceanbase/oceanbase-client/) |


JDBC connector and drivers are not part of Flink's binary distribution. See how to link with them for cluster execution [here]({{< ref "docs/dev/configuration/overview" >}}).
JDBC connector and drivers are not part of Flink's binary distribution.
See how to link with them for cluster execution [here]({{< ref "docs/dev/configuration/overview" >}}).
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nit: what do we mean by link with. It sounds like linking after compiling. I suggest, See how to use them

@@ -6,7 +6,7 @@
<parent>
<groupId>org.apache.flink</groupId>
<artifactId>flink-connector-jdbc-parent</artifactId>
<version>4.0-SNAPSHOT</version>
<version>4.1-SNAPSHOT</version>
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I ams curious should this be 4.0.1 ?

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