Vector library - field (layer) related fns. More...

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <grass/gis.h>
#include <grass/glocale.h>
#include <grass/dbmi.h>
#include <grass/vector.h>
#include "local_proto.h"
#include <gdal_version.h>
#include <ogr_api.h>

Include dependency graph for field.c:

Go to the source code of this file.

Functions
struct dblinks *	Vect_new_dblinks_struct (void)
	Create and init new dblinks structure. More...

void	Vect_reset_dblinks (struct dblinks *p)
	Reset dblinks structure (number of fields) More...

int	Vect_map_add_dblink (struct Map_info Map, int number, const char name, const char table, const char key, const char db, const char driver)
	Add new db connection to Map_info structure. More...

int	Vect_map_del_dblink (struct Map_info *Map, int field)
	Delete db connection from Map_info structure. More...

void	Vect_copy_map_dblinks (const struct Map_info In, struct Map_info Out, int first_only)
	Copy DB links from input vector map to output vector map. More...

int	Vect_map_check_dblink (const struct Map_info Map, int field, const char name)
	Check if DB connection exists in dblinks structure. More...

int	Vect_check_dblink (const struct dblinks p, int field, const char name)
	Check if DB connection exists in dblinks structure. More...

int	Vect_add_dblink (struct dblinks p, int number, const char name, const char table, const char key, const char db, const char driver)
	Add new DB connection to dblinks structure. More...

struct field_info *	Vect_default_field_info (struct Map_info Map, int field, const char field_name, int type)
	Get default information about link to database for new dblink. More...

struct field_info *	Vect_get_dblink (const struct Map_info *Map, int link)
	Get information about link to database. More...

struct field_info *	Vect_get_field (const struct Map_info *Map, int field)
	Get information about link to database (by layer number) More...

struct field_info *	Vect_get_field_by_name (const struct Map_info Map, const char field)
	Get information about link to database (by layer name) More...

struct field_info *	Vect_get_field2 (const struct Map_info Map, const char field)
	Get information about link to database (by layer number or layer name) More...

int	Vect_get_field_number (const struct Map_info Map, const char field)
	Get field number of given field. More...

int	Vect_read_dblinks (struct Map_info *Map)
	Read dblinks to existing structure. More...

int	Vect_write_dblinks (struct Map_info *Map)
	Write dblinks to file. More...

char *	Vect_subst_var (const char in, const struct Map_info Map)
	Substitute variable in string. More...

void	Vect_set_db_updated (struct Map_info *Map)
	Rewrite 'dbln' file. More...

Detailed Description

Vector library - field (layer) related fns.

Higher level functions for reading/writing/manipulating vectors.

Todo:: see Vect_read_dblinks(); activate auto-FID detection once OGR_L_GetFIDColumn() is working or solution found if FID not available

This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Author: Original author CERL, probably Dave Gerdes or Mike Higgins.; Update to GRASS 5.7 by Radim Blazek and David D. Gray.; Various updates by Martin Landa <landa.martin gmail.com>, 2009-2011

Definition in file field.c.

Function Documentation

◆ Vect_add_dblink()

int Vect_add_dblink	(	struct dblinks *	p,
		int	number,
		const char *	name,
		const char *	table,
		const char *	key,
		const char *	db,
		const char *	driver
	)

Add new DB connection to dblinks structure.

Parameters

[in,out]	p	pointer to existing dblinks structure
	number	layer number (1 for OGR)
	name	layer name (layer for OGR) - if not given use table name
	table	table name (layer for OGR)
	key	key name
	db	database name (datasource for OGR)
	driver	driver name (dbf, postgresql, ogr, ...)

Returns: 0 on success; -1 error

Definition at line 277 of file field.c.

◆ Vect_check_dblink()

int Vect_check_dblink	(	const struct dblinks *	p,
		int	field,
		const char *	name
	)

Check if DB connection exists in dblinks structure.

Parameters

p	pointer to existing dblinks structure
field	layer number
name	layer name

Returns: 1 dblink for field exists; 0 dblink does not exist for field

Definition at line 244 of file field.c.

References dblinks::field, G_debug(), dblinks::n_fields, field_info::name, NULL, and field_info::number.

Referenced by Vect_map_check_dblink().

◆ Vect_copy_map_dblinks()

void Vect_copy_map_dblinks	(	const struct Map_info *	In,
		struct Map_info *	Out,
		int	first_only
	)

Copy DB links from input vector map to output vector map.

Parameters

In	pointer to Map_info structure (input)
Out	pointer to Map_info structure (output)
first_only	TRUE to copy only first link otherwise all DB links are copied

Definition at line 197 of file field.c.

References _, field_info::database, field_info::driver, G_warning(), field_info::key, field_info::name, field_info::number, field_info::table, Vect_get_dblink(), Vect_get_num_dblinks(), and Vect_map_add_dblink().

Referenced by Vect_close().

◆ Vect_default_field_info()

struct field_info* Vect_default_field_info	(	struct Map_info *	Map,
		int	field,
		const char *	field_name,
		int	type
	)

Get default information about link to database for new dblink.

Parameters

Map	pointer to Map_info structure
field	layer number
field_name	layer name
type	how many tables are linked to map: GV_1TABLE / GV_MTABLE

Returns: pointer to allocated field_info structure

Definition at line 351 of file field.c.

◆ Vect_get_dblink()

struct field_info* Vect_get_dblink	(	const struct Map_info *	Map,
		int	link
	)

Get information about link to database.

Variables are substituted by values, link is index to array of dblinks.

Parameters

Map	pointer to Map_info structure
link	link id

Returns: pointer to new field_info structure

Definition at line 466 of file field.c.

References _, field_info::database, Map_info::dblnk, field_info::driver, dblinks::field, G_debug(), G_malloc, G_store(), G_warning(), field_info::key, dblinks::n_fields, field_info::name, NULL, field_info::number, field_info::table, and Vect_subst_var().

Referenced by Vect_copy_map_dblinks(), Vect_get_field(), Vect_get_field2(), and Vect_get_field_by_name().

◆ Vect_get_field()

struct field_info* Vect_get_field	(	const struct Map_info *	Map,
		int	field
	)

Get information about link to database (by layer number)

Variables are substituted by values, field is number of requested field.

Parameters

Map	pointer to Map_info structure
field	layer number

Returns: pointer to new field_info structure; NULL if not found

Definition at line 506 of file field.c.

References Map_info::dblnk, dblinks::field, G_debug(), dblinks::n_fields, NULL, field_info::number, and Vect_get_dblink().

Referenced by Vect_cats_set_constraint(), and Vect_get_field2().

◆ Vect_get_field2()

struct field_info* Vect_get_field2	(	const struct Map_info *	Map,
		const char *	field
	)

Get information about link to database (by layer number or layer name)

Note: if field is -1 then the function returns the first dblink or NULL

Parameters

Map	pointer to Map_info structure
field	layer number or name

Returns: pointer to new field_info structure; NULL if not found

Definition at line 561 of file field.c.

References G_debug(), NULL, Vect_get_dblink(), Vect_get_field(), Vect_get_field_by_name(), and Vect_get_num_dblinks().

Referenced by Vect_get_field_number().

◆ Vect_get_field_by_name()

struct field_info* Vect_get_field_by_name	(	const struct Map_info *	Map,
		const char *	field
	)

Get information about link to database (by layer name)

Parameters

Map	pointer to Map_info structure
field	layer name

Returns: pointer to new field_info structure; NULL if not found

Definition at line 532 of file field.c.

References Map_info::dblnk, dblinks::field, G_debug(), dblinks::n_fields, field_info::name, NULL, and Vect_get_dblink().

Referenced by Vect_get_field2().

◆ Vect_get_field_number()

int Vect_get_field_number	(	const struct Map_info *	Map,
		const char *	field
	)

Get field number of given field.

Parameters

Map	pointer to Map_info structure
field	layer name

Returns: layer number; -1 for all layers; 0 if layer not found

Definition at line 598 of file field.c.

References G_debug(), field_info::number, Vect_get_field2(), and Vect_get_num_dblinks().

Referenced by vector2perimeters().

◆ Vect_map_add_dblink()

int Vect_map_add_dblink	(	struct Map_info *	Map,
		int	number,
		const char *	name,
		const char *	table,
		const char *	key,
		const char *	db,
		const char *	driver
	)

Add new db connection to Map_info structure.

Parameters

Map	pointer to Map_info structure
number	layer number
name	layer name (if not given use table name)
table	table name
key	key name
db	database name
driver	driver name

Returns: 0 on success; -1 on failure

Definition at line 113 of file field.c.

Referenced by Vect_copy_map_dblinks().

◆ Vect_map_check_dblink()

int Vect_map_check_dblink	(	const struct Map_info *	Map,
		int	field,
		const char *	name
	)

Check if DB connection exists in dblinks structure.

Parameters

Map	pointer to Map_info structure
field	layer number
name	layer name

Returns: 1 dblink for field exists; 0 dblink does not exist for field

Definition at line 229 of file field.c.

References Map_info::dblnk, and Vect_check_dblink().

◆ Vect_map_del_dblink()

int Vect_map_del_dblink	(	struct Map_info *	Map,
		int	field
	)

Delete db connection from Map_info structure.

Parameters

Map	pointer to Map_info structure
field	layer number (-1 to delete all dblinks)

Returns: 0 deleted; -1 error

Definition at line 153 of file field.c.

References _, field_info::database, Map_info::dblnk, field_info::driver, dblinks::field, G_debug(), G_warning(), field_info::key, dblinks::n_fields, field_info::name, field_info::number, field_info::table, and Vect_write_dblinks().

Referenced by Vect_close().

◆ Vect_new_dblinks_struct()

struct dblinks* Vect_new_dblinks_struct ( void )

Create and init new dblinks structure.

Returns: pointer to new dblinks structure; NULL on failure

Definition at line 46 of file field.c.

References G_malloc, and G_zero().

◆ Vect_read_dblinks()

int Vect_read_dblinks ( struct Map_info * Map )

Read dblinks to existing structure.

Variables are not substituted by values.

Parameters

Map	pointer to Map_info structure

Returns: number of links read; -1 on error

Definition at line 920 of file field.c.

References Map_info::dblnk, Map_info::format, G_debug(), GV_FORMAT_NATIVE, Map_info::mapset, Map_info::name, and Vect_reset_dblinks().

◆ Vect_reset_dblinks()

void Vect_reset_dblinks ( struct dblinks * p )

Reset dblinks structure (number of fields)

Parameters

p	pointer to existing dblinks structure

Definition at line 94 of file field.c.

References dblinks::n_fields.

Referenced by Vect_read_dblinks().

◆ Vect_set_db_updated()

void Vect_set_db_updated ( struct Map_info * Map )

Rewrite 'dbln' file.

Should be used by GRASS modules which update database tables, so that other applications know that tables were changed and can reload data.

Parameters

Map	pointer to Map_info structure

Definition at line 1061 of file field.c.

References _, G_fatal_error(), G_mapset(), G_strcasecmp(), Map_info::mapset, and Vect_write_dblinks().

◆ Vect_subst_var()

char* Vect_subst_var	(	const char *	in,
		const struct Map_info *	Map
	)

Substitute variable in string.

Parameters

in	current string
Map	pointer to Map_info structure

Returns: pointer to new string

Definition at line 1003 of file field.c.

Referenced by Vect_get_dblink().

◆ Vect_write_dblinks()

int Vect_write_dblinks ( struct Map_info * Map )

Write dblinks to file.

Parameters

Map	pointer to Map_info structure

Returns: 0 on success; -1 on error

Definition at line 951 of file field.c.

References _, field_info::database, Map_info::dblnk, field_info::driver, dblinks::field, Map_info::format, G_debug(), G_fopen_new(), G_warning(), GPATH_MAX, GV_DBLN_ELEMENT, GV_FORMAT_NATIVE, field_info::key, Map_info::mapset, dblinks::n_fields, field_info::name, Map_info::name, NULL, field_info::number, field_info::table, Vect__get_path(), and Vect_get_name().

Referenced by V1_close_nat(), Vect_map_del_dblink(), and Vect_set_db_updated().

Functions

Detailed Description

Function Documentation

◆ Vect_add_dblink()

◆ Vect_check_dblink()

◆ Vect_copy_map_dblinks()

◆ Vect_default_field_info()

◆ Vect_get_dblink()

◆ Vect_get_field()

◆ Vect_get_field2()

◆ Vect_get_field_by_name()

◆ Vect_get_field_number()

◆ Vect_map_add_dblink()

◆ Vect_map_check_dblink()

◆ Vect_map_del_dblink()

◆ Vect_new_dblinks_struct()

◆ Vect_read_dblinks()

◆ Vect_reset_dblinks()

◆ Vect_set_db_updated()

◆ Vect_subst_var()

◆ Vect_write_dblinks()