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fix: include different ways to delete data in sample #3034

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Jun 4, 2020
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fix: include different ways to delete data in sample #3034

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23 changes: 15 additions & 8 deletions spanner/cloud-client/src/main/java/com/example/spanner/SpannerSample.java
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,7 @@
import com.google.cloud.spanner.InstanceAdminClient;
import com.google.cloud.spanner.InstanceId;
import com.google.cloud.spanner.Key;
import com.google.cloud.spanner.KeyRange;
import com.google.cloud.spanner.KeySet;
import com.google.cloud.spanner.Mutation;
import com.google.cloud.spanner.Options;
Expand Down Expand Up @@ -353,15 +354,21 @@ static void writeExampleData(DatabaseClient dbClient) {
static void deleteExampleData(DatabaseClient dbClient) {
List<Mutation> mutations = new ArrayList<>();

// KeySet.all() can be used to delete all the rows in a table.
mutations.add(Mutation.delete("Albums", KeySet.all()));
// KeySet.Builder can be used to delete a specific set of rows.
// Delete the Albums with the key values (2,1) and (2,3).
mutations.add(
Mutation.delete(
"Albums", KeySet.newBuilder().addKey(Key.of(2, 1)).addKey(Key.of(2, 3)).build()));

// KeySet.singleKey() can be used to delete one row at a time.
for (Singer singer : SINGERS) {
mutations.add(
Mutation.delete(
"Singers", KeySet.singleKey(Key.newBuilder().append(singer.singerId).build())));
}
// KeyRange can be used to delete rows with a key in a specific range.
// Delete a range of rows where the column key is >=3 and <5
mutations.add(
Mutation.delete("Singers", KeySet.range(KeyRange.closedOpen(Key.of(3), Key.of(5)))));

// KeySet.all() can be used to delete all the rows in a table.
// Delete remaining Singers rows, which will also delete the remaining Albums rows since it was
// defined with ON DELETE CASCADE.
mutations.add(Mutation.delete("Singers", KeySet.all()));

dbClient.write(mutations);
System.out.printf("Records deleted.\n");
Expand Down