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WT-2360 Introduced a more complex join example to show nesting and disjunction.

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This commit is contained in:
Don Anderson
2016-04-14 15:58:09 -04:00
parent 12e9a78a60
commit dce3b942e4
2 changed files with 130 additions and 22 deletions
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76
examples/c/ex_schema.c
View File

@@ -69,7 +69,8 @@ main(void)
{
POP_RECORD *p;
WT_CONNECTION *conn;
WT_CURSOR *cursor, *cursor2, *join_cursor, *stat_cursor;
WT_CURSOR *country_cursor, *country_cursor2, *cursor, *join_cursor,
*stat_cursor, *subjoin_cursor, *year_cursor;
WT_SESSION *session;
const char *country;
uint64_t recno, population;
@@ -336,18 +337,18 @@ main(void)
ret = session->open_cursor(session,
"join:table:poptable", NULL, NULL, &join_cursor);
ret = session->open_cursor(session,
"index:poptable:country", NULL, NULL, &cursor);
"index:poptable:country", NULL, NULL, &country_cursor);
ret = session->open_cursor(session,
"index:poptable:immutable_year", NULL, NULL, &cursor2);
"index:poptable:immutable_year", NULL, NULL, &year_cursor);
/* select values WHERE country == "AU" AND year > 1900 */
cursor->set_key(cursor, "AU\0\0\0");
ret = cursor->search(cursor);
ret = session->join(session, join_cursor, cursor,
country_cursor->set_key(country_cursor, "AU\0\0\0");
ret = country_cursor->search(country_cursor);
ret = session->join(session, join_cursor, country_cursor,
"compare=eq,count=10");
cursor2->set_key(cursor2, (uint16_t)1900);
ret = cursor2->search(cursor2);
ret = session->join(session, join_cursor, cursor2,
year_cursor->set_key(year_cursor, (uint16_t)1900);
ret = year_cursor->search(year_cursor);
ret = session->join(session, join_cursor, year_cursor,
"compare=gt,count=10,strategy=bloom");
/* List the values that are joined */
@@ -370,8 +371,61 @@ main(void)
ret = stat_cursor->close(stat_cursor);
ret = join_cursor->close(join_cursor);
ret = cursor2->close(cursor2);
ret = cursor->close(cursor);
ret = year_cursor->close(year_cursor);
ret = country_cursor->close(country_cursor);
/*! [Complex join cursors] */
/* Open cursors needed by the join. */
ret = session->open_cursor(session,
"join:table:poptable", NULL, NULL, &join_cursor);
ret = session->open_cursor(session,
"join:table:poptable", NULL, NULL, &subjoin_cursor);
ret = session->open_cursor(session,
"index:poptable:country", NULL, NULL, &country_cursor);
ret = session->open_cursor(session,
"index:poptable:country", NULL, NULL, &country_cursor2);
ret = session->open_cursor(session,
"index:poptable:immutable_year", NULL, NULL, &year_cursor);
/*
* select values WHERE (country == "AU" OR country == "UK")
* AND year > 1900
*
* First, set up the join representing the country clause.
*/
country_cursor->set_key(country_cursor, "AU\0\0\0");
ret = country_cursor->search(country_cursor);
ret = session->join(session, subjoin_cursor, country_cursor,
"operation=or,compare=eq,count=10");
country_cursor2->set_key(country_cursor2, "UK\0\0\0");
ret = country_cursor2->search(country_cursor2);
ret = session->join(session, subjoin_cursor, country_cursor2,
"operation=or,compare=eq,count=10");
/* Join that to the top join, and add the year clause */
ret = session->join(session, join_cursor, subjoin_cursor, NULL);
year_cursor->set_key(year_cursor, (uint16_t)1900);
ret = year_cursor->search(year_cursor);
ret = session->join(session, join_cursor, year_cursor,
"compare=gt,count=10,strategy=bloom");
/* List the values that are joined */
while ((ret = join_cursor->next(join_cursor)) == 0) {
ret = join_cursor->get_key(join_cursor, &recno);
ret = join_cursor->get_value(join_cursor, &country, &year,
&population);
printf("ID %" PRIu64, recno);
printf(
": country %s, year %" PRIu16 ", population %" PRIu64 "\n",
country, year, population);
}
/*! [Complex join cursors] */
ret = join_cursor->close(join_cursor);
ret = subjoin_cursor->close(subjoin_cursor);
ret = country_cursor->close(country_cursor);
ret = country_cursor2->close(country_cursor2);
ret = year_cursor->close(year_cursor);
ret = conn->close(conn, NULL);

76
examples/java/com/wiredtiger/examples/ex_schema.java
View File

@@ -76,7 +76,8 @@ public class ex_schema {
throws WiredTigerException
{
Connection conn;
Cursor cursor, cursor2, join_cursor, stat_cursor;
Cursor country_cursor, country_cursor2, cursor, join_cursor,
stat_cursor, subjoin_cursor, year_cursor;
Session session;
String country;
long recno, population;
@@ -343,18 +344,18 @@ public class ex_schema {
/* Open cursors needed by the join. */
join_cursor = session.open_cursor(
"join:table:poptable", null, null);
cursor = session.open_cursor(
country_cursor = session.open_cursor(
"index:poptable:country", null, null);
cursor2 = session.open_cursor(
year_cursor = session.open_cursor(
"index:poptable:immutable_year", null, null);
/* select values WHERE country == "AU" AND year > 1900 */
cursor.putKeyString("AU");
ret = cursor.search();
session.join(join_cursor, cursor, "compare=eq,count=10");
cursor2.putKeyShort((short)1900);
ret = cursor2.search();
session.join(join_cursor, cursor2,
country_cursor.putKeyString("AU");
ret = country_cursor.search();
session.join(join_cursor, country_cursor, "compare=eq,count=10");
year_cursor.putKeyShort((short)1900);
ret = year_cursor.search();
session.join(join_cursor, year_cursor,
"compare=gt,count=10,strategy=bloom");
/* List the values that are joined */
@@ -376,8 +377,61 @@ public class ex_schema {
ret = stat_cursor.close();
ret = join_cursor.close();
ret = cursor2.close();
ret = cursor.close();
ret = year_cursor.close();
ret = country_cursor.close();
/*! [Complex join cursors] */
/* Open cursors needed by the join. */
join_cursor = session.open_cursor(
"join:table:poptable", null, null);
subjoin_cursor = session.open_cursor(
"join:table:poptable", null, null);
country_cursor = session.open_cursor(
"index:poptable:country", null, null);
country_cursor2 = session.open_cursor(
"index:poptable:country", null, null);
year_cursor = session.open_cursor(
"index:poptable:immutable_year", null, null);
/*
* select values WHERE (country == "AU" OR country == "UK")
* AND year > 1900
*
* First, set up the join representing the country clause.
*/
country_cursor.putKeyString("AU");
ret = country_cursor.search();
ret = session.join(subjoin_cursor, country_cursor,
"operation=or,compare=eq,count=10");
country_cursor2.putKeyString("UK");
ret = country_cursor2.search();
ret = session.join(subjoin_cursor, country_cursor2,
"operation=or,compare=eq,count=10");
/* Join that to the top join, and add the year clause */
ret = session.join(join_cursor, subjoin_cursor, null);
year_cursor.putKeyShort((short)1900);
ret = year_cursor.search();
ret = session.join(join_cursor, year_cursor,
"compare=gt,count=10,strategy=bloom");
/* List the values that are joined */
while ((ret = join_cursor.next()) == 0) {
recno = join_cursor.getKeyRecord();
country = join_cursor.getValueString();
year = join_cursor.getValueShort();
population = join_cursor.getValueLong();
System.out.print("ID " + recno);
System.out.println( ": country " + country + ", year " + year +
", population " + population);
}
/*! [Complex join cursors] */
ret = join_cursor.close();
ret = subjoin_cursor.close();
ret = year_cursor.close();
ret = country_cursor.close();
ret = country_cursor2.close();
ret = conn.close(null);