flink 1.11运算结果存mysql出错

各位大佬好，请教一个问题flink从Kafka读数，写入mysql，程序没有报错，但是没有写入mysql任何数据。代码如下，是在linux下，直接python *.py执行的。完整代码如下

from pyflink.datastream import StreamExecutionEnvironment, TimeCharacteristic, CheckpointingMode

from pyflink.table import StreamTableEnvironment, EnvironmentSettings

source="""

CREATE TABLE kafka_source_tab (

 id VARCHAR,   

 alarm_id VARCHAR,   

 trck_id VARCHAR

) WITH (

 'connector' = 'kafka',

 'topic' = 'alarm_test_g',   

 'scan.startup.mode' = 'earliest-offset',

 'properties.bootstrap.servers' = '10.2.2.73:2181',

 'properties.bootstrap.servers' = '10.2.2.73:9092',

 'format' = 'json' 

)

"""

sink="""

CREATE TABLE g_source_tab (

 id VARCHAR,   

 alarm_id VARCHAR,     

 trck_id VARCHAR

) WITH (

 'connector' = 'jdbc',

 'url' = 'jdbc:mysql://10.2.2.77:3306/bdt?useSSL=false', 

 'table-name' = 'g',   

 'username' = 'root',

 'password' = '123456t',

 'sink.buffer-flush.interval' = '1s'

)

"""

env = StreamExecutionEnvironment.get_execution_environment()

env.set_stream_time_characteristic(TimeCharacteristic.EventTime)

env.set_parallelism(1)

env_settings = EnvironmentSettings.new_instance().use_blink_planner().in_streaming_mode().build()

t_env = StreamTableEnvironment.create(env, environment_settings=env_settings)

t_env.execute_sql(source)

t_env.execute_sql(sink)

source = t_env.from_path("kafka_source_tab")\

        .select("id,alarm_id,trck_id")

source.execute_insert("g_source_tab")

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