flink-python/pyflink/table/tests/test_shell_example.py

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from pyflink.testing.test_case_utils import PyFlinkTestCase


class ShellExampleTests(PyFlinkTestCase):
    """
    If these tests failed, please fix these examples code and copy them to shell.py
    """

    def test_batch_case(self):
        from pyflink.shell import b_env, bt_env, FileSystem, OldCsv, DataTypes, Schema
        # example begin

        import tempfile
        import os
        import shutil
        sink_path = tempfile.gettempdir() + '/batch.csv'
        if os.path.exists(sink_path):
            if os.path.isfile(sink_path):
                os.remove(sink_path)
            else:
                shutil.rmtree(sink_path)
        b_env.set_parallelism(1)
        t = bt_env.from_elements([(1, 'hi', 'hello'), (2, 'hi', 'hello')], ['a', 'b', 'c'])
        bt_env.connect(FileSystem().path(sink_path))\
            .with_format(OldCsv()
                         .field_delimiter(',')
                         .field("a", DataTypes.BIGINT())
                         .field("b", DataTypes.STRING())
                         .field("c", DataTypes.STRING()))\
            .with_schema(Schema()
                         .field("a", DataTypes.BIGINT())
                         .field("b", DataTypes.STRING())
                         .field("c", DataTypes.STRING()))\
            .create_temporary_table("batch_sink")

        t.select("a + 1, b, c").execute_insert("batch_sink").wait()

        # verify code, do not copy these code to shell.py
        with open(sink_path, 'r') as f:
            lines = f.read()
            self.assertEqual(lines, '2,hi,hello\n' + '3,hi,hello\n')

    def test_stream_case(self):
        from pyflink.shell import s_env, st_env, FileSystem, OldCsv, DataTypes, Schema
        # example begin

        import tempfile
        import os
        import shutil
        sink_path = tempfile.gettempdir() + '/streaming.csv'
        if os.path.exists(sink_path):
            if os.path.isfile(sink_path):
                os.remove(sink_path)
            else:
                shutil.rmtree(sink_path)
        s_env.set_parallelism(1)
        t = st_env.from_elements([(1, 'hi', 'hello'), (2, 'hi', 'hello')], ['a', 'b', 'c'])
        st_env.connect(FileSystem().path(sink_path))\
            .with_format(OldCsv()
                         .field_delimiter(',')
                         .field("a", DataTypes.BIGINT())
                         .field("b", DataTypes.STRING())
                         .field("c", DataTypes.STRING()))\
            .with_schema(Schema()
                         .field("a", DataTypes.BIGINT())
                         .field("b", DataTypes.STRING())
                         .field("c", DataTypes.STRING()))\
            .create_temporary_table("stream_sink")

        t.select("a + 1, b, c").execute_insert("stream_sink").wait()

        # verify code, do not copy these code to shell.py
        with open(sink_path, 'r') as f:
            lines = f.read()
            self.assertEqual(lines, '2,hi,hello\n' + '3,hi,hello\n')