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/**
* \file db.c
*
* \brief DBMI - Low Level SQLite database driver.
*
* 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 <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <grass/gis.h>
#include <grass/dbmi.h>
#include <grass/glocale.h>
#include "globals.h"
#include "proto.h"
/**
* \brief Open SQLite database.
*
* \param[in,out] handle database handle
*
* \return DB_FAILED on error
* \return DB_OK on success
*/
int db__driver_open_database(dbHandle *handle)
{
char name2[GPATH_MAX], *path;
const char *name;
char name3[GPATH_MAX + 14], *env_nolock;
int i;
G_debug(3, "\ndb_driver_open_database()");
name = db_get_handle_dbname(handle);
/* if name is empty use connection.databaseName */
if (strlen(name) == 0) {
dbConnection connection;
db_get_connection(&connection);
name = connection.databaseName;
}
G_debug(3, "name = '%s'", name);
/* parse variables in db.name if present */
if (strchr(name, '$')) {
char **tokens;
int no_tokens, n;
tokens = G_tokenize(name, "/");
no_tokens = G_number_of_tokens(tokens);
name2[0] = '\0';
for (n = 0; n < no_tokens; n++) {
G_chop(tokens[n]);
if (n > 0)
strcat(name2, "/");
G_debug(3, "tokens[%d] = %s", n, tokens[n]);
if (tokens[n][0] == '$') {
G_strchg(tokens[n], '$', ' ');
G_chop(tokens[n]);
strcat(name2, G_getenv_nofatal(tokens[n]));
G_debug(3, " -> %s", G_getenv_nofatal(tokens[n]));
}
else {
strcat(name2, tokens[n]);
}
}
G_free_tokens(tokens);
}
else {
strcpy(name2, name);
}
G_debug(2, "name2 = '%s'", name2);
path = G_store(name2);
path = G_convert_dirseps_to_host(path);
i = strlen(path);
while (path[i] != HOST_DIRSEP && i > 0)
i--;
path[i] = '\0';
if (*path) {
G_debug(2, "path to db is %s", path);
/* create directory if not existing */
if (access(path, 0) != 0) {
if (G_mkdir(path) != 0)
G_fatal_error(
_("Unable to create directory '%s' for sqlite database"),
path);
}
}
G_free(path);
env_nolock = getenv("GRASS_SQLITE_NOLOCK");
if (env_nolock && *env_nolock && atoi(env_nolock)) {
if (sqlite3_config(SQLITE_CONFIG_URI, 1) == SQLITE_OK) {
if (sprintf(name3, "file:%s?nolock=1", name2) < 0) {
return DB_FAILED;
}
G_important_message(_("Disabling SQLite locking"));
}
else {
G_warning(_("The sqlite config option '%s' is not supported"),
"SQLITE_CONFIG_URI");
strcpy(name3, name2);
}
}
else
strcpy(name3, name2);
if (sqlite3_open(name3, &sqlite) != SQLITE_OK) {
db_d_append_error("%s %s\n%s", _("Unable to open database:"), name3,
(char *)sqlite3_errmsg(sqlite));
db_d_report_error();
return DB_FAILED;
}
/* enable loading of extensions */
sqlite3_enable_load_extension(sqlite, 1);
/* set the sqlite busy handler */
sqlite3_busy_handler(sqlite, sqlite_busy_callback, NULL);
return DB_OK;
}
/**
* \brief Close SQLite database.
*
* \return always returns DB_OK
*/
int db__driver_close_database(void)
{
G_debug(3, "db_close_database()");
if (sqlite3_close(sqlite) == SQLITE_BUSY)
G_fatal_error(_("SQLite database connection is still busy"));
return DB_OK;
}
/**
* \brief Create new empty SQLite database.
*
* \param handle dbHandle
*
* \return DB_OK on success
* \return DB_FAILED on failure
*/
int db__driver_create_database(dbHandle *handle)
{
const char *name;
char name2[GPATH_MAX], *env_nolock;
name = db_get_handle_dbname(handle);
G_debug(1, "db_create_database(): %s", name);
if (access(name, F_OK) == 0) {
db_d_append_error(_("Database <%s> already exists"), name);
db_d_report_error();
return DB_FAILED;
}
env_nolock = getenv("GRASS_SQLITE_NOLOCK");
if (env_nolock && *env_nolock && atoi(env_nolock)) {
if (sqlite3_config(SQLITE_CONFIG_URI, 1) == SQLITE_OK) {
if (sprintf(name2, "file:%s?nolock=1", name) < 0) {
return DB_FAILED;
}
G_important_message(_("Disabling SQLite locking"));
}
else {
G_warning(_("The sqlite config option '%s' is not supported"),
"SQLITE_CONFIG_URI");
strcpy(name2, name);
}
}
else
strcpy(name2, name);
if (sqlite3_open(name2, &sqlite) != SQLITE_OK) {
db_d_append_error("%s %s\n%s", _("Unable to create database:"), name,
(char *)sqlite3_errmsg(sqlite));
db_d_report_error();
return DB_FAILED;
}
return DB_OK;
}
/**
* \brief Delete existing SQLite database.
*
* \param handle dbHandle
*
* \return DB_OK on success
* \return DB_FAILED on failure
*/
int db__driver_delete_database(dbHandle *handle)
{
const char *name;
name = db_get_handle_dbname(handle);
if (access(name, F_OK) != 0) {
db_d_append_error(_("Database <%s> not found"), name);
db_d_report_error();
return DB_FAILED;
}
return remove(name) == 0 ? DB_OK : DB_FAILED;
}
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