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Posted to commits@seatunnel.apache.org by "EricJoy2048 (via GitHub)" <gi...@apache.org> on 2023/05/17 12:29:31 UTC
[GitHub] [incubator-seatunnel] EricJoy2048 commented on a diff in pull request #4757: [Docs][Connector-V2][PostgreSQL] Refactor connector-v2 docs using unified format PostgreSQL #4590
EricJoy2048 commented on code in PR #4757:
URL: https://github.com/apache/incubator-seatunnel/pull/4757#discussion_r1196435444
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docs/en/connector-v2/sink/PostgreSql.md:
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+# PostgreSql
+
+> JDBC PostgreSql Sink Connector
+
+## Support Those Engines
+
+> Spark<br/>
+> Flink<br/>
+> Seatunnel Zeta<br/>
+
+## Key Features
+
+- [x] [exactly-once](../../concept/connector-v2-features.md)
+- [x] [cdc](../../concept/connector-v2-features.md)
+
+> Use `Xa transactions` to ensure `exactly-once`. So only support `exactly-once` for the database which is
+> support `Xa transactions`. You can set `is_exactly_once=true` to enable it.
+
+## Description
+
+Write data through jdbc. Support Batch mode and Streaming mode, support concurrent writing, support exactly-once
+semantics (using XA transaction guarantee).
+
+## Supported DataSource Info
+
+| Datasource | Supported Versions | Driver | Url | Maven |
+|------------|------------------------------------------------------------|-----------------------|---------------------------------------|--------------------------------------------------------------------------|
+| PostgreSQL | Different dependency version has different driver class. | org.postgresql.Driver | jdbc:postgresql://localhost:5432/test | [Download](https://mvnrepository.com/artifact/org.postgresql/postgresql) |
+| PostgreSQL | If you want to manipulate the GEOMETRY type in PostgreSQL. | org.postgresql.Driver | jdbc:postgresql://localhost:5432/test | [Download](https://mvnrepository.com/artifact/net.postgis/postgis-jdbc) |
+
+## Database Dependency
+
+> Please download the support list corresponding to 'Maven' and copy it to the '$SEATNUNNEL_HOME/plugins/jdbc/lib/' working directory<br/>
+> For example PostgreSQL datasource: cp postgresql-xxx.jar $SEATNUNNEL_HOME/plugins/jdbc/lib/<br/>
+> If you want to manipulate the GEOMETRY type in PostgreSQL, add postgresql-xxx.jar and postgis-jdbc-xxx.jar to $SEATNUNNEL_HOME/plugins/jdbc/lib/
+
+## Data Type Mapping
+
+| PostgreSQL Data type | Seatunnel Data type |
+|----------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------|
+| BOOL<br/> | BOOLEAN |
+| _BOOL<br/> | ARRAY<BOOLEAN> |
+| BYTEA<br/> | BYTES |
+| _BYTEA<br/> | ARRAY<TINYINT> |
+| INT2<br/>SMALLSERIAL<br/>INT4<br/>SERIAL<br/> | INT |
+| _INT2<br/>_INT4<br/> | ARRAY<INT> |
+| INT8<br/>BIGSERIAL<br/> | BIGINT |
+| _INT8<br/> | ARRAY<BIGINT> |
+| FLOAT4<br/> | FLOAT |
+| _FLOAT4<br/> | ARRAY<FLOAT> |
+| FLOAT8<br/> | DOUBLE |
+| _FLOAT8<br/> | ARRAY<DOUBLE> |
+| NUMERIC(Get the designated column's specified column size>0) | DECIMAL(Get the designated column's specified column size,Gets the number of digits in the specified column to the right of the decimal point) |
+| NUMERIC(Get the designated column's specified column size<0) | DECIMAL(38, 18) |
+| BPCHAR<br/>CHARACTER<br/>VARCHAR<br/>TEXT<br/>GEOMETRY<br/>GEOGRAPHY | STRING |
+| _BPCHAR<br/>_CHARACTER<br/>_VARCHAR<br/>_TEXT | ARRAY<STRING> |
+| TIMESTAMP<br/> | TIMESTAMP |
+| TIME<br/> | TIME |
+| DATE<br/> | DATE |
+| OTHER DATA TYPES | NOT SUPPORTED YET |
+
+## Options
+
+| Name | Type | Required | Default | Description |
+|-------------------------------------------|---------|----------|---------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| url | String | Yes | - | The URL of the JDBC connection. Refer to a case: jdbc:postgresql://localhost:5432/test |
+| driver | String | Yes | - | The jdbc class name used to connect to the remote data source,<br/> if you use PostgreSQL the value is `org.postgresql.Driver`. |
+| user | String | No | - | Connection instance user name |
+| password | String | No | - | Connection instance password |
+| query | String | No | - | Use this sql write upstream input datas to database. e.g `INSERT ...`,`query` have the higher priority |
+| database | String | No | - | Use this `database` and `table-name` auto-generate sql and receive upstream input datas write to database.<br/>This option is mutually exclusive with `query` and has a higher priority. |
+| table | String | No | - | Use database and this table-name auto-generate sql and receive upstream input datas write to database.<br/>This option is mutually exclusive with `query` and has a higher priority. |
+| primary_keys | Array | No | - | This option is used to support operations such as `insert`, `delete`, and `update` when automatically generate sql. |
+| support_upsert_by_query_primary_key_exist | Boolean | No | false | Choose to use INSERT sql, UPDATE sql to process update events(INSERT, UPDATE_AFTER) based on query primary key exists. This configuration is only used when database unsupport upsert syntax. **Note**: that this method has low performance |
+| connection_check_timeout_sec | Int | No | 30 | The time in seconds to wait for the database operation used to validate the connection to complete. |
+| max_retries | Int | No | 0 | The number of retries to submit failed (executeBatch) |
+| batch_size | Int | No | 1000 | For batch writing, when the number of buffered records reaches the number of `batch_size` or the time reaches `batch_interval_ms`<br/>, the data will be flushed into the database |
+| batch_interval_ms | Int | No | 1000 | For batch writing, when the number of buffers reaches the number of `batch_size` or the time reaches `batch_interval_ms`, the data will be flushed into the database |
+| is_exactly_once | Boolean | No | false | Whether to enable exactly-once semantics, which will use Xa transactions. If on, you need to<br/>set `xa_data_source_class_name`. |
+| generate_sink_sql | Boolean | No | false | Generate sql statements based on the database table you want to write to. |
+| xa_data_source_class_name | String | No | - | The xa data source class name of the database Driver, for example, PostgreSQL is `org.postgresql.xa.PGXADataSource`, and<br/>please refer to appendix for other data sources |
+| max_commit_attempts | Int | No | 3 | The number of retries for transaction commit failures |
+| transaction_timeout_sec | Int | No | -1 | The timeout after the transaction is opened, the default is -1 (never timeout). Note that setting the timeout may affect<br/>exactly-once semantics |
+| auto_commit | Boolean | No | true | Automatic transaction commit is enabled by default |
+| common-options | | no | - | Sink plugin common parameters, please refer to [Sink Common Options](common-options.md) for details |
+
+### Tips
+
+> If partition_column is not set, it will run in single concurrency, and if partition_column is set, it will be executed in parallel according to the concurrency of tasks.
+
+## Task Example
+
+### Simple:
+
+> This example defines a SeaTunnel synchronization task that automatically generates data through FakeSource and sends it to JDBC Sink. FakeSource generates a total of 16 rows of data (row.num=16), with each row having two fields, name (string type) and age (int type). The final target table is test_table will also be 16 rows of data in the table. Before run this job, you need create database test and table test_table in your PostgreSQL. And if you have not yet installed and deployed SeaTunnel, you need to follow the instructions in [Install SeaTunnel](../../start-v2/locally/deployment.md) to install and deploy SeaTunnel. And then follow the instructions in [Quick Start With SeaTunnel Engine](../../start-v2/locally/quick-start-seatunnel-engine.md) to run this job.
+
+```
+# Defining the runtime environment
+env {
+ # You can set flink configuration here
+ execution.parallelism = 1
+ job.mode = "BATCH"
+}
+
+source {
+ FakeSource {
+ parallelism = 1
+ result_table_name = "fake"
+ row.num = 16
+ schema = {
+ fields {
+ name = "string"
+ age = "int"
+ }
+ }
+ }
+ # If you would like to get more information about how to configure seatunnel and see full list of source plugins,
+ # please go to https://seatunnel.apache.org/docs/category/source-v2
+}
+
+transform {
+ # If you would like to get more information about how to configure seatunnel and see full list of transform plugins,
+ # please go to https://seatunnel.apache.org/docs/category/transform-v2
+}
+
+sink {
+ jdbc {
+ url = "jdbc:postgresql://localhost:5432/test"
+ driver = "org.postgresql.Driver"
+ user = root
+ password = 123456
+ query = "insert into test_table(name,age) values(?,?)"
+ }
+ # If you would like to get more information about how to configure seatunnel and see full list of sink plugins,
+ # please go to https://seatunnel.apache.org/docs/category/sink-v2
+}
+```
+
+> This example not need to write complex sql statements, you can configure the database name table name to automatically generate add statements for you
+
+```
+sink {
+ Jdbc {
+ url = "jdbc:postgresql://localhost:5432/test"
+ driver = org.postgresql.Driver
+ user = root
+ password = 123456
+
+ generate_sink_sql = true
+ database = test
+ table = "public.test_table"
+ }
+}
+```
+
+### Exactly-once :
+
+> For accurate write scene we guarantee accurate once
+
+```
+sink {
+ jdbc {
+ url = "jdbc:postgresql://localhost:5432/test"
+ driver = "org.postgresql.Driver"
+
+ max_retries = 0
+ user = root
+ password = 123456
+ query = "insert into test_table(name,age) values(?,?)"
+
+ is_exactly_once = "true"
+
+ xa_data_source_class_name = "org.postgresql.xa.PGXADataSource"
+ }
+}
+```
+
Review Comment:
Can you add examples for `generate_sink_sql `
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