UNLOAD 语句
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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
table_env = StreamTableEnvironment.create(...)

# 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

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UNLOAD MODULE #

The following grammar gives an overview of the available syntax:

UNLOAD MODULE module_name