GRASS GIS 8 Programmer's Manual  8.5.0dev(2024)-76958057df
dbmi_client/table.c
Go to the documentation of this file.
1 /*!
2  * \file db/dbmi_client/table.c
3  *
4  * \brief DBMI Library (client) - table management
5  *
6  * (C) 1999-2008 by the GRASS Development Team
7  *
8  * This program is free software under the GNU General Public
9  * License (>=v2). Read the file COPYING that comes with GRASS
10  * for details.
11  *
12  * \author Joel Jones (CERL/UIUC), Radim Blazek
13  */
14 
15 #include <stdlib.h>
16 #include <string.h>
17 #include <grass/gis.h>
18 #include <grass/dbmi.h>
19 #include <grass/glocale.h>
20 
21 /*!
22  \brief Check if table exists
23 
24  \param drvname driver name
25  \param dbname database name
26  \param tabname table name
27 
28  \return 1 exist
29  \return 0 doesn't exist
30  \return -1 error
31  */
32 int db_table_exists(const char *drvname, const char *dbname,
33  const char *tabname)
34 {
36  dbString *names;
37  int i, count, found = 0;
38  int full = 0;
39  char buf[1000];
40  char *bufp, *c;
41 
42  if (strchr(tabname, '.'))
43  full = 1;
44 
45  driver = db_start_driver_open_database(drvname, dbname);
46  if (driver == NULL) {
47  G_warning(_("Unable open database <%s> by driver <%s>"), dbname,
48  drvname);
49  return -1;
50  }
51 
52  /* The table tabname can be either fully qualified in form table.schema,
53  * or it can be only table name. If the name is fully qualified, compare
54  * whole name, if it is not, compare only table names */
55 
56  /* user tables */
57  if (db_list_tables(driver, &names, &count, 0) != DB_OK)
58  return (-1);
59 
60  for (i = 0; i < count; i++) {
61  strcpy(buf, db_get_string(&names[i]));
62  bufp = buf;
63  if (!full && (c = strchr(buf, '.'))) {
64  bufp = c + 1;
65  }
66  G_debug(2, "table = %s -> %s", buf, bufp);
67  if (G_strcasecmp(tabname, bufp) == 0) {
68  found = 1;
69  break;
70  }
71  }
73 
74  if (!found) { /* system tables */
75  if (db_list_tables(driver, &names, &count, 1) != DB_OK)
76  return (-1);
77 
78  for (i = 0; i < count; i++) {
79  strcpy(buf, db_get_string(&names[i]));
80  bufp = buf;
81  if (!full && (c = strchr(buf, '.'))) {
82  bufp = c + 1;
83  }
84  if (G_strcasecmp(tabname, bufp) == 0) {
85  found = 1;
86  break;
87  }
88  }
90  }
92 
93  return (found);
94 }
95 
96 /*!
97  \brief Get number of rows of table
98 
99  \param driver db driver
100  \param sql SQL statement
101 
102  \return number of records
103  \return -1
104  */
106 {
107  int nrows;
108  dbCursor cursor;
109 
110  if (db_open_select_cursor(driver, sql, &cursor, DB_SEQUENTIAL) != DB_OK) {
111  G_warning(_("Unable to open select cursor: '%s'"), db_get_string(sql));
113  return -1;
114  }
115 
116  nrows = db_get_num_rows(&cursor);
117  db_close_cursor(&cursor);
118 
119  return nrows;
120 }
#define NULL
Definition: ccmath.h:32
#define DB_SEQUENTIAL
Definition: dbmi.h:123
#define DB_OK
Definition: dbmi.h:71
int db_table_exists(const char *drvname, const char *dbname, const char *tabname)
Check if table exists.
int db_get_table_number_of_rows(dbDriver *driver, dbString *sql)
Get number of rows of table.
dbDriver * db_start_driver_open_database(const char *, const char *)
Open driver/database connection.
Definition: db.c:28
int db_get_num_rows(dbCursor *)
Get number of selected rows.
Definition: c_rows.c:26
int db_close_database_shutdown_driver(dbDriver *)
Close driver/database connection.
Definition: db.c:61
void db_free_string_array(dbString *, int)
Free allocated dbString array.
Definition: string.c:163
int db_list_tables(dbDriver *, dbString **, int *, int)
List available tables for given connection.
Definition: c_list_tabs.c:39
int db_close_cursor(dbCursor *)
Close cursor.
Definition: c_close_cur.c:27
int db_open_select_cursor(dbDriver *, dbString *, dbCursor *, int)
Open select cursor.
Definition: c_openselect.c:37
char * db_get_string(const dbString *)
Get string.
Definition: string.c:140
void G_warning(const char *,...) __attribute__((format(printf
int int G_strcasecmp(const char *, const char *)
String compare ignoring case (upper or lower)
Definition: strings.c:47
int G_debug(int, const char *,...) __attribute__((format(printf
const struct driver * driver
Definition: driver/init.c:25
#define _(str)
Definition: glocale.h:10
int count
@ full
Definition: lz4.c:623
#define strcpy
Definition: parson.c:62
Definition: driver.h:21