c_create_idx.c

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/*!
 * \file db/dbmi_client/c_create_idx.c
 *
 * \brief DBMI Library (client) - create index
 *
 * (C) 1999-2008 by the GRASS Development Team
 *
 * This program is free software under the GNU General Public
 * License (>=v2). Read the file COPYING that comes with GRASS
 * for details.
 *
 * \author Joel Jones (CERL/UIUC), Radim Blazek
 */
 
#include <string.h>
#include <grass/dbmi.h>
#include "macros.h"
 
/*!
   \brief Create index
 
   \param driver db driver
   \param index index info (pointer to dbIndex structure)
 
   \return DB_OK on success
   \return DB_FAILED on failure
 */
int db_create_index(dbDriver *driver, dbIndex *index)
{
    int ret_code;
 
    /* start the procedure call */
    db__set_protocol_fds(driver->send, driver->recv);
    DB_START_PROCEDURE_CALL(DB_PROC_CREATE_INDEX);
 
    /* send the arguments to the procedure */
    DB_SEND_INDEX(index);
 
    /* get the return code for the procedure call */
    DB_RECV_RETURN_CODE(&ret_code);
 
    if (ret_code != DB_OK)
        return ret_code; /* ret_code SHOULD == DB_FAILED */
 
    /* get results */
    DB_RECV_STRING(&index->indexName);
 
    return DB_OK;
}
 
/*!
   \brief Create unique index
 
   \param driver db driver
   \param table_name table name
   \param column_name column name (where to create index)
 
   \return DB_OK on success
   \return DB_FAILED on failure
 */
int db_create_index2(dbDriver *driver, const char *table_name,
                     const char *column_name)
{
    int ret;
    dbIndex index;
    char buf[1000];
    const char *tbl;
 
    db_init_index(&index);
    db_alloc_index_columns(&index, 1);
 
    tbl = strchr(table_name, '.');
    if (tbl == NULL)
        tbl = table_name;
    else
        tbl++;
 
    snprintf(buf, sizeof(buf), "%s_%s", tbl, column_name);
    db_set_index_name(&index, buf);
 
    db_set_index_table_name(&index, table_name);
    db_set_index_column_name(&index, 0, column_name);
    db_set_index_type_unique(&index);
 
    ret = db_create_index(driver, &index);
 
    db_free_index(&index);
 
    return ret;
}