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UNLOAD 语句
UNLOAD Statements #
UNLOAD statements are used to unload a built-in or user-defined module.
Run a UNLOAD statement #
UNLOAD statements can be executed with the executeSql() method of the TableEnvironment. The executeSql() method returns ‘OK’ for a successful LOAD operation; otherwise it will throw an exception.
The following examples show how to run a UNLOAD statement in TableEnvironment.
UNLOAD statements can be executed with the executeSql() method of the TableEnvironment. The executeSql() method returns ‘OK’ for a successful LOAD operation; otherwise it will throw an exception.
The following examples show how to run a UNLOAD statement in TableEnvironment.
UNLOAD statements can be executed with the executeSql() method of the TableEnvironment. The executeSql() method returns ‘OK’ for a successful LOAD operation; otherwise it will throw an exception.
The following examples show how to run a UNLOAD statement in TableEnvironment.
UNLOAD statements can be executed in SQL CLI.
The following examples show how to run a UNLOAD statement in SQL CLI.
StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
StreamTableEnvironment tEnv = StreamTableEnvironment.create(env);
// unload a core module
tEnv.executeSql("UNLOAD MODULE core");
tEnv.executeSql("SHOW MODULES").print();
// Empty set
val env = StreamExecutionEnvironment.getExecutionEnvironment()
val tEnv = StreamTableEnvironment.create(env)
// unload a core module
tEnv.executeSql("UNLOAD MODULE core")
tEnv.executeSql("SHOW MODULES").print()
// Empty set
settings = EnvironmentSettings.new_instance()...
table_env = StreamTableEnvironment.create(env, settings)
# unload a core module
table_env.execute_sql("UNLOAD MODULE core")
table_env.execute_sql("SHOW MODULES").print()
# Empty set
Flink SQL> UNLOAD MODULE core;
[INFO] Unload module succeeded!
Flink SQL> SHOW MODULES;
Empty set
UNLOAD MODULE #
The following grammar gives an overview of the available syntax:
UNLOAD MODULE module_name