SHOW 语句

StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
StreamTableEnvironment tEnv = StreamTableEnvironment.create(env);

// show catalogs
tEnv.executeSql("SHOW CATALOGS").print();
// +-----------------+
// |    catalog name |
// +-----------------+
// | default_catalog |
// +-----------------+

// show databases
tEnv.executeSql("SHOW DATABASES").print();
// +------------------+
// |    database name |
// +------------------+
// | default_database |
// +------------------+

// create a table
tEnv.executeSql("CREATE TABLE my_table (...) WITH (...)");
// show tables
tEnv.executeSql("SHOW TABLES").print();
// +------------+
// | table name |
// +------------+
// |   my_table |
// +------------+

// create a view
tEnv.executeSql("CREATE VIEW my_view AS ...");
// show views
tEnv.executeSql("SHOW VIEWS").print();
// +-----------+
// | view name |
// +-----------+
// |   my_view |
// +-----------+

// show functions
tEnv.executeSql("SHOW FUNCTIONS").print();
// +---------------+
// | function name |
// +---------------+
// |           mod |
// |        sha256 |
// |           ... |
// +---------------+

val env = StreamExecutionEnvironment.getExecutionEnvironment()
val tEnv = StreamTableEnvironment.create(env)

// show catalogs
tEnv.executeSql("SHOW CATALOGS").print()
// +-----------------+
// |    catalog name |
// +-----------------+
// | default_catalog |
// +-----------------+

// show databases
tEnv.executeSql("SHOW DATABASES").print()
// +------------------+
// |    database name |
// +------------------+
// | default_database |
// +------------------+

// create a table
tEnv.executeSql("CREATE TABLE my_table (...) WITH (...)")
// show tables
tEnv.executeSql("SHOW TABLES").print()
// +------------+
// | table name |
// +------------+
// |   my_table |
// +------------+

// create a view
tEnv.executeSql("CREATE VIEW my_view AS ...")
// show views
tEnv.executeSql("SHOW VIEWS").print()
// +-----------+
// | view name |
// +-----------+
// |   my_view |
// +-----------+

// show functions
tEnv.executeSql("SHOW FUNCTIONS").print()
// +---------------+
// | function name |
// +---------------+
// |           mod |
// |        sha256 |
// |           ... |
// +---------------+

settings = EnvironmentSettings.new_instance()...
table_env = StreamTableEnvironment.create(env, settings)

# show catalogs
table_env.execute_sql("SHOW CATALOGS").print()
# +-----------------+
# |    catalog name |
# +-----------------+
# | default_catalog |
# +-----------------+

# show databases
table_env.execute_sql("SHOW DATABASES").print()
# +------------------+
# |    database name |
# +------------------+
# | default_database |
# +------------------+

# create a table
table_env.execute_sql("CREATE TABLE my_table (...) WITH (...)")
# show tables
table_env.execute_sql("SHOW TABLES").print()
# +------------+
# | table name |
# +------------+
# |   my_table |
# +------------+

# create a view
table_env.execute_sql("CREATE VIEW my_view AS ...")
# show views
table_env.execute_sql("SHOW VIEWS").print()
# +-----------+
# | view name |
# +-----------+
# |   my_view |
# +-----------+

# show functions
table_env.execute_sql("SHOW FUNCTIONS").print()
# +---------------+
# | function name |
# +---------------+
# |           mod |
# |        sha256 |
# |           ... |
# +---------------+

Flink SQL> SHOW CATALOGS;
default_catalog

Flink SQL> SHOW DATABASES;
default_database

Flink SQL> CREATE TABLE my_table (...) WITH (...);
[INFO] Table has been created.

Flink SQL> SHOW TABLES;
my_table

Flink SQL> CREATE VIEW my_view AS ...;
[INFO] View has been created.

Flink SQL> SHOW VIEWS;
my_view

Flink SQL> SHOW FUNCTIONS;
mod
sha256
...