Postgresql Spanner Sample

[Sivakumar-Searce]

1. Added samples for Postgresql (i.e PgSpannerSample)
2. Written Integration Tests for the samples
3. Checked code lints

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

For more information, open the CLA check for this pull request.

[snippet-bot]

Here is the summary of possible violations 😱

There are 3 possible violations for not having product prefix.

• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:587, tag init_client
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:604, tag init_client
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:611, tag init_client

The end of the violation section. All the stuff below is FYI purposes only.

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Here is the summary of changes.

You are about to add 22 region tags.

• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:15, tag spanner_insert_data
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:31, tag spanner_create_database
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:51, tag spanner_insert_data
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:80, tag spanner_query_data
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:94, tag spanner_read_data
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:111, tag spanner_add_column
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:135, tag spanner_update_data
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:162, tag spanner_read_write_transaction
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:207, tag spanner_query_data_with_new_column
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:229, tag spanner_create_index
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:252, tag spanner_read_data_with_index
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:269, tag spanner_create_storing_index
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:295, tag spanner_read_data_with_storing_index
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:318, tag spanner_read_only_transaction
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:344, tag spanner_query_singers_table
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:362, tag spanner_dml_getting_started_insert
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:381, tag spanner_query_with_parameter
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:403, tag spanner_dml_getting_started_update
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:455, tag spanner_create_table_using_ddl
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:587, tag init_client
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:604, tag init_client
• samples/snippets/src/main/java/com/example/spanner/PgSpannerSample.java:611, tag init_client

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[ansh0l]

@Sivakumar-Searce : Please template your PR title, description etc based on this PR : #1700. Also, cla is missing, please add it.

Once you do so, I will have a look again.

[ansh0l]

cc: @sfogel2 @jin-jj