b65420c0bd
--HG-- branch : mjc rename : examples/c/ex_schema.c => examples/c/ex_call_center.c extra : transplant_source : %AE%E9%C4%0B%3A%C5%0EH%E1%A8%A2L%E6%D2%D6%40G%9Dzq
105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/*
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* ex_column.c Copyright (c) 2010 WiredTiger
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*
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* This is an example application demonstrating how to create and access
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* tables using a schema.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include <wiredtiger.h>
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#define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
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const char *home = "WT_TEST";
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/* The C struct for the data we are storing with WiredTiger. */
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typedef struct {
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char country[5];
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uint16_t year;
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uint64_t population;
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} POP_RECORD;
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/* Description of the schema. */
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static WT_COLUMN_INFO pop_columns[] = {
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{ "country", 0, NULL, NULL },
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{ "year", 0, NULL, NULL },
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{ "population", 1, NULL, NULL }
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};
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static const char *country_year_cols[] = { "country", "year" };
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static WT_INDEX_INFO pop_indices[] = {
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{ "country_year", country_year_cols, ARRAY_SIZE(country_year_cols) }
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};
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static WT_SCHEMA pop_schema = {
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"r", /* Format string for keys (recno). */
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"5sHQ", /*
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* Format string for data items:
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* (5-byte string, short, long).
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* See ::wiredtiger_struct_pack
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*/
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pop_columns, /* Column descriptions. */
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ARRAY_SIZE(pop_columns), /* Number of columns. */
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pop_indices, /* Index descriptions. */
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ARRAY_SIZE(pop_indices), /* Number of indices. */
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};
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POP_RECORD pop_data[] = {
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{ "USA", 1980, 226542250 },
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{ "USA", 2009, 307006550 },
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{ "UK", 2008, 61414062 },
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{ "CAN", 2008, 33311400 },
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{ "AU", 2008, 21431800 }
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};
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int main()
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{
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int ret;
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WT_CONNECTION *conn;
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WT_SESSION *session;
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WT_CURSOR *cursor;
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POP_RECORD *p, *endp;
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const char *country;
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wiredtiger_recno_t recno;
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ret = wiredtiger_open(home, NULL, "create", &conn);
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if (ret != 0)
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fprintf(stderr, "Error connecting to %s: %s\n",
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home, wiredtiger_strerror(ret));
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/* Note: error checking omitted for clarity. */
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if (conn->is_new(conn)) {
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ret = conn->add_schema(conn, "POP_RECORD", &pop_schema, NULL);
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ret = session->create_table(session, "population",
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"schema=POP_RECORD");
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}
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ret = conn->open_session(conn, NULL, NULL, &session);
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ret = session->open_cursor(session, "table:population", NULL, &cursor);
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endp = pop_data + ARRAY_SIZE(pop_data);
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for (p = pop_data; p < endp; p++) {
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cursor->set_value(cursor, p->country, p->year, p->population);
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ret = cursor->insert(cursor);
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}
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ret = cursor->close(cursor, NULL);
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/* Now just read through the countries we know about */
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ret = session->open_cursor(session, "column:population.country",
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"dup=first", &cursor);
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while ((ret = cursor->next(cursor)) == 0) {
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cursor->get_key(cursor, &country);
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cursor->get_value(cursor, &recno);
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printf("Got country %s : row ID %d\n", country, (int)recno);
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}
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ret = conn->close(conn, NULL);
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return (ret);
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}
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