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/**
* \file index.c
*
* \brief Low level SQLite database index functions.
*
* This program is free software under the GNU General Public License
* (>=v2). Read the file COPYING that comes with GRASS for details.
*
* \author Radim Blazek
* \author Support for multiple connections by Markus Metz
*
* \date 2005-2011
*/
#include <grass/dbmi.h>
#include <grass/glocale.h>
#include "globals.h"
#include "proto.h"
/**
* \fn int db__driver_create_index (dbIndex *index)
*
* \brief Create SQLite database index.
*
* \param[in] index index to be created
* \return int DB_FAILED on error; DB_OK on success
*/
int db__driver_create_index(dbIndex *index)
{
int i, ncols;
sqlite3_stmt *statement;
dbString sql;
const char *rest;
int ret;
G_debug(3, "db__create_index()");
db_init_string(&sql);
ncols = db_get_index_number_of_columns(index);
db_set_string(&sql, "create");
if (db_test_index_type_unique(index))
db_append_string(&sql, " unique");
db_append_string(&sql, " index ");
db_append_string(&sql, "if not exists ");
db_append_string(&sql, db_get_index_name(index));
db_append_string(&sql, " on ");
db_append_string(&sql, db_get_index_table_name(index));
db_append_string(&sql, " ( ");
for (i = 0; i < ncols; i++) {
if (i > 0)
db_append_string(&sql, ", ");
db_append_string(&sql, db_get_index_column_name(index, i));
}
db_append_string(&sql, " )");
G_debug(3, " SQL: %s", db_get_string(&sql));
/* SQLITE bug?
* If the database schema has changed, sqlite can prepare a statement,
* but sqlite can not step, the statement needs to be prepared anew again */
while (1) {
ret =
sqlite3_prepare(sqlite, db_get_string(&sql), -1, &statement, &rest);
if (ret != SQLITE_OK) {
db_d_append_error("%s\n%s\n%s", _("Unable to create index:"),
db_get_string(&sql),
(char *)sqlite3_errmsg(sqlite));
db_d_report_error();
sqlite3_finalize(statement);
db_free_string(&sql);
return DB_FAILED;
}
ret = sqlite3_step(statement);
/* get real result code */
ret = sqlite3_reset(statement);
if (ret == SQLITE_SCHEMA) {
sqlite3_finalize(statement);
/* try again */
}
else if (ret != SQLITE_OK) {
db_d_append_error("%s\n%s", _("Error in sqlite3_step():"),
(char *)sqlite3_errmsg(sqlite));
db_d_report_error();
sqlite3_finalize(statement);
db_free_string(&sql);
return DB_FAILED;
}
else
break;
}
sqlite3_finalize(statement);
db_free_string(&sql);
return DB_OK;
}
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