# 环境定义
from pyflink.datastream import StreamExecutionEnvironment
from pyflink.table import StreamTableEnvironment, EnvironmentSettings
from pyflink.table.catalog import JdbcCatalog
from pyflink.table.types import Row
# pyflink 环境配置
env = StreamExecutionEnvironment.get_execution_environment()
env_settings = EnvironmentSettings.new_instance().in_streaming_mode().use_blink_planner().build()
t_env = StreamTableEnvironment.create(env, environment_settings=env_settings)
t_env.get_config().get_configuration().set_string("taskmanager.memory.task.off-heap.size", '100m')
JdbcCatalog 已装依赖包
flink sql通过JdbcCatalog连接postgresql数据库，从而实现直接对postgresql表的相关操作，相关代码如下：
# catalog 生产库连接信息 定义
sc_catalog_name = "mycatalog"
sc_default_database = "postgres"
sc_username = "root"
sc_password = "123456"
sc_base_url = "jdbc:postgresql://xxxx.xx.xxx.xxx:3306"
# 注册
sc_catalog = JdbcCatalog(sc_catalog_name, sc_default_database, sc_username, sc_password, sc_base_url)
t_env.register_catalog(catalog_name=sc_catalog_name, catalog=sc_catalog)
# 将JdbcCatalog设置为会话的当前Catalog
t_env.use_catalog(sc_catalog_name)
t_env.use_database(sc_default_database)
sql = "select * from `postgres.tabel_name`"
table = t_env.sql_query(sql)
rowDataStream = t_env.to_append_stream(table, Row.__class__)
rowDataStream.print()
t_env.execute("test")
以上代码，执行后将报如下错误：
py4j.protocol.Py4JJavaError: An error occurred while calling o14.registerCatalog. : org.apache.flink.table.api.ValidationException: Failed connecting to jdbc:postgresql://xxxx.xx.xxx.xxx:3306/postgres via JDBC. at org.apache.flink.connector.jdbc.catalog.AbstractJdbcCatalog.open(AbstractJdbcCatalog.java:103) at org.apache.flink.table.catalog.CatalogManager.registerCatalog(CatalogManager.java:195) at org.apache.flink.table.api.internal.TableEnvironmentImpl.registerCatalog(TableEnvironmentImpl.java:373) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at org.apache.flink.api.python.shaded.py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244) at org.apache.flink.api.python.shaded.py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357) at org.apache.flink.api.python.shaded.py4j.Gateway.invoke(Gateway.java:282) at org.apache.flink.api.python.shaded.py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132) at org.apache.flink.api.python.shaded.py4j.commands.CallCommand.execute(CallCommand.java:79) at org.apache.flink.api.python.shaded.py4j.GatewayConnection.run(GatewayConnection.java:238) at java.base/java.lang.Thread.run(Thread.java:834) Caused by: org.postgresql.util.PSQLException: 进行 SSL 连线时发生错误。 at org.postgresql.core.v3.ConnectionFactoryImpl.enableSSL(ConnectionFactoryImpl.java:550) at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:151) at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:215) at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:51) at org.postgresql.jdbc.PgConnection.(PgConnection.java:225) at org.postgresql.Driver.makeConnection(Driver.java:466) at org.postgresql.Driver.connect(Driver.java:265) at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:677) at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:228) at org.apache.flink.connector.jdbc.catalog.AbstractJdbcCatalog.open(AbstractJdbcCatalog.java:100) ... 13 more
提示jdbc:postgresql://xxxx.xx.xxx.xxx:3306/postgres 连接失败，原因：Caused by: org.postgresql.util.PSQLException: 进行 SSL 连线时发生错误。
多次尝试，猜测是否环境配置出现问题，但是本人却一直未能发现到底是哪个环节出现问题。不知道有没遇到类似问题的游客，能为我解惑~~~
