DBM routines

Modules
	SDBM library

Data Structures
struct	apr_datum_t

Macros
#define	APR_DBM_READONLY   1
#define	APR_DBM_READWRITE   2
#define	APR_DBM_RWCREATE   3
#define	APR_DBM_RWTRUNC   4

Typedefs
typedef struct apr_dbm_t	apr_dbm_t

Functions
apr_status_t	apr_dbm_open_ex (apr_dbm_t **dbm, const char *type, const char *name, apr_int32_t mode, apr_fileperms_t perm, apr_pool_t *cntxt)
apr_status_t	apr_dbm_open (apr_dbm_t **dbm, const char *name, apr_int32_t mode, apr_fileperms_t perm, apr_pool_t *cntxt)
void	apr_dbm_close (apr_dbm_t *dbm)
apr_status_t	apr_dbm_fetch (apr_dbm_t *dbm, apr_datum_t key, apr_datum_t *pvalue)
apr_status_t	apr_dbm_store (apr_dbm_t *dbm, apr_datum_t key, apr_datum_t value)
apr_status_t	apr_dbm_delete (apr_dbm_t *dbm, apr_datum_t key)
int	apr_dbm_exists (apr_dbm_t *dbm, apr_datum_t key)
apr_status_t	apr_dbm_firstkey (apr_dbm_t *dbm, apr_datum_t *pkey)
apr_status_t	apr_dbm_nextkey (apr_dbm_t *dbm, apr_datum_t *pkey)
void	apr_dbm_freedatum (apr_dbm_t *dbm, apr_datum_t data)
char *	apr_dbm_geterror (apr_dbm_t *dbm, int *errcode, char *errbuf, apr_size_t errbufsize)
apr_status_t	apr_dbm_get_usednames_ex (apr_pool_t *pool, const char *type, const char *pathname, const char **used1, const char **used2)
void	apr_dbm_get_usednames (apr_pool_t *pool, const char *pathname, const char **used1, const char **used2)

Detailed Description

Macro Definition Documentation

#define APR_DBM_READONLY   1

open for read-only access

#define APR_DBM_READWRITE   2

open for read-write access

#define APR_DBM_RWCREATE   3

open for r/w, create if needed

#define APR_DBM_RWTRUNC   4

open for r/w, truncating an existing DB if present

Typedef Documentation

typedef struct apr_dbm_t apr_dbm_t

Structure for referencing a dbm

Function Documentation

void apr_dbm_close

(

apr_dbm_t *

dbm

)

Close a dbm file previously opened by apr_dbm_open

Parameters

dbm	The database to close

apr_status_t apr_dbm_delete	(	apr_dbm_t *	dbm,
		apr_datum_t	key
	)

Delete a dbm record value by key

Parameters

dbm	The database
key	The key datum of the record to delete

Remarks

It is not an error to delete a non-existent record.

int apr_dbm_exists	(	apr_dbm_t *	dbm,
		apr_datum_t	key
	)

Search for a key within the dbm

Parameters

dbm	The database
key	The datum describing a key to test

apr_status_t apr_dbm_fetch	(	apr_dbm_t *	dbm,
		apr_datum_t	key,
		apr_datum_t *	pvalue
	)

Fetch a dbm record value by key

Parameters

dbm	The database
key	The key datum to find this record
pvalue	The value datum retrieved for this record

apr_status_t apr_dbm_firstkey	(	apr_dbm_t *	dbm,
		apr_datum_t *	pkey
	)

Retrieve the first record key from a dbm

Parameters

dbm	The database
pkey	The key datum of the first record

void apr_dbm_freedatum	(	apr_dbm_t *	dbm,
		apr_datum_t	data
	)

Proactively toss any memory associated with the apr_datum_t.

Parameters

dbm	The database
data	The datum to free.

void apr_dbm_get_usednames	(	apr_pool_t *	pool,
		const char *	pathname,
		const char **	used1,
		const char **	used2
	)

If the specified file/path were passed to apr_dbm_open(), return the actual file/path names which would be (created and) used. At most, two files may be used; used2 may be NULL if only one file is used.

Parameters

pool	The pool for allocating used1 and used2.
pathname	The path name to generate used-names from.
used1	The first pathname used by the apr_dbm implementation.
used2	The second pathname used by apr_dbm. If only one file is used by the specific implementation, this will be set to NULL.

Remarks

The dbm file(s) don't need to exist. This function only manipulates the pathnames.

apr_status_t apr_dbm_get_usednames_ex	(	apr_pool_t *	pool,
		const char *	type,
		const char *	pathname,
		const char **	used1,
		const char **	used2
	)

If the specified file/path were passed to apr_dbm_open(), return the actual file/path names which would be (created and) used. At most, two files may be used; used2 may be NULL if only one file is used.

Parameters

pool	The pool for allocating used1 and used2.
type	The type of DBM you require info on

See also

apr_dbm_open_ex

Parameters

pathname	The path name to generate used-names from.
used1	The first pathname used by the apr_dbm implementation.
used2	The second pathname used by apr_dbm. If only one file is used by the specific implementation, this will be set to NULL.

Returns

An error if the specified type is invalid.

Remarks

The dbm file(s) don't need to exist. This function only manipulates the pathnames.

char* apr_dbm_geterror	(	apr_dbm_t *	dbm,
		int *	errcode,
		char *	errbuf,
		apr_size_t	errbufsize
	)

Report more information when an apr_dbm function fails.

Parameters

dbm	The database
errcode	A DBM-specific value for the error (for logging). If this isn't needed, it may be NULL.
errbuf	Location to store the error text
errbufsize	The size of the provided buffer

Returns

The errbuf parameter, for convenience.

apr_status_t apr_dbm_nextkey	(	apr_dbm_t *	dbm,
		apr_datum_t *	pkey
	)

Retrieve the next record key from a dbm

Parameters

dbm	The database
pkey	The key datum of the next record

apr_status_t apr_dbm_open	(	apr_dbm_t **	dbm,
		const char *	name,
		apr_int32_t	mode,
		apr_fileperms_t	perm,
		apr_pool_t *	cntxt
	)

Open a dbm file by file name

Parameters

dbm	The newly opened database
name	The dbm file name to open
mode	The flag value APR_DBM_READONLY open for read-only access APR_DBM_READWRITE open for read-write access APR_DBM_RWCREATE open for r/w, create if needed APR_DBM_RWTRUNC open for r/w, truncate if already there
perm	Permissions to apply to if created
cntxt	The pool to use when creating the dbm

Remarks

The dbm name may not be a true file name, as many dbm packages append suffixes for seperate data and index files.

apr_status_t apr_dbm_open_ex	(	apr_dbm_t **	dbm,
		const char *	type,
		const char *	name,
		apr_int32_t	mode,
		apr_fileperms_t	perm,
		apr_pool_t *	cntxt
	)

Open a dbm file by file name and type of DBM

Parameters

dbm	The newly opened database
type	The type of the DBM (not all may be available at run time) db for Berkeley DB files gdbm for GDBM files ndbm for NDBM files sdbm for SDBM files (always available) default for the default DBM type
name	The dbm file name to open
mode	The flag value APR_DBM_READONLY open for read-only access APR_DBM_READWRITE open for read-write access APR_DBM_RWCREATE open for r/w, create if needed APR_DBM_RWTRUNC open for r/w, truncate if already there
perm	Permissions to apply to if created
cntxt	The pool to use when creating the dbm

Remarks

The dbm name may not be a true file name, as many dbm packages append suffixes for seperate data and index files.

Bug:

In apr-util 0.9 and 1.x, the type arg was case insensitive. This was highly inefficient, and as of 2.x the dbm name must be provided in the correct case (lower case for all bundled providers)

apr_status_t apr_dbm_store	(	apr_dbm_t *	dbm,
		apr_datum_t	key,
		apr_datum_t	value
	)

Store a dbm record value by key

Parameters

dbm	The database
key	The key datum to store this record by
value	The value datum to store in this record