DBD routines

Defines
#define	APR_DBD_TRANSACTION_COMMIT   0x00
#define	APR_DBD_TRANSACTION_ROLLBACK   0x01
#define	APR_DBD_TRANSACTION_IGNORE_ERRORS   0x02
Typedefs
typedef struct apr_dbd_driver_t	apr_dbd_driver_t
typedef struct apr_dbd_t	apr_dbd_t
typedef struct apr_dbd_transaction_t	apr_dbd_transaction_t
typedef struct apr_dbd_results_t	apr_dbd_results_t
typedef struct apr_dbd_row_t	apr_dbd_row_t
typedef struct apr_dbd_prepared_t	apr_dbd_prepared_t
Enumerations
enum	apr_dbd_type_e {   APR_DBD_TYPE_NONE, APR_DBD_TYPE_TINY, APR_DBD_TYPE_UTINY, APR_DBD_TYPE_SHORT,   APR_DBD_TYPE_USHORT, APR_DBD_TYPE_INT, APR_DBD_TYPE_UINT, APR_DBD_TYPE_LONG,   APR_DBD_TYPE_ULONG, APR_DBD_TYPE_LONGLONG, APR_DBD_TYPE_ULONGLONG, APR_DBD_TYPE_FLOAT,   APR_DBD_TYPE_DOUBLE, APR_DBD_TYPE_STRING, APR_DBD_TYPE_TEXT, APR_DBD_TYPE_TIME,   APR_DBD_TYPE_DATE, APR_DBD_TYPE_DATETIME, APR_DBD_TYPE_TIMESTAMP, APR_DBD_TYPE_ZTIMESTAMP,   APR_DBD_TYPE_BLOB, APR_DBD_TYPE_CLOB, APR_DBD_TYPE_NULL }
Functions
apr_status_t	apr_dbd_init (apr_pool_t *pool)
apr_status_t	apr_dbd_get_driver (apr_pool_t *pool, const char *name, const apr_dbd_driver_t **driver)
apr_status_t	apr_dbd_open_ex (const apr_dbd_driver_t *driver, apr_pool_t *pool, const char *params, apr_dbd_t **handle, const char **error)
apr_status_t	apr_dbd_open (const apr_dbd_driver_t *driver, apr_pool_t *pool, const char *params, apr_dbd_t **handle)
apr_status_t	apr_dbd_close (const apr_dbd_driver_t *driver, apr_dbd_t *handle)
const char *	apr_dbd_name (const apr_dbd_driver_t *driver)
void *	apr_dbd_native_handle (const apr_dbd_driver_t *driver, apr_dbd_t *handle)
int	apr_dbd_check_conn (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_t *handle)
int	apr_dbd_set_dbname (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_t *handle, const char *name)
int	apr_dbd_transaction_start (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_t *handle, apr_dbd_transaction_t **trans)
int	apr_dbd_transaction_end (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_transaction_t *trans)
int	apr_dbd_transaction_mode_get (const apr_dbd_driver_t *driver, apr_dbd_transaction_t *trans)
int	apr_dbd_transaction_mode_set (const apr_dbd_driver_t *driver, apr_dbd_transaction_t *trans, int mode)
int	apr_dbd_query (const apr_dbd_driver_t *driver, apr_dbd_t *handle, int *nrows, const char *statement)
int	apr_dbd_select (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_t *handle, apr_dbd_results_t **res, const char *statement, int random)
int	apr_dbd_num_cols (const apr_dbd_driver_t *driver, apr_dbd_results_t *res)
int	apr_dbd_num_tuples (const apr_dbd_driver_t *driver, apr_dbd_results_t *res)
int	apr_dbd_get_row (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_results_t *res, apr_dbd_row_t **row, int rownum)
const char *	apr_dbd_get_entry (const apr_dbd_driver_t *driver, apr_dbd_row_t *row, int col)
const char *	apr_dbd_get_name (const apr_dbd_driver_t *driver, apr_dbd_results_t *res, int col)
const char *	apr_dbd_error (const apr_dbd_driver_t *driver, apr_dbd_t *handle, int errnum)
const char *	apr_dbd_escape (const apr_dbd_driver_t *driver, apr_pool_t *pool, const char *string, apr_dbd_t *handle)
int	apr_dbd_prepare (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_t *handle, const char *query, const char *label, apr_dbd_prepared_t **statement)
int	apr_dbd_pquery (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_t *handle, int *nrows, apr_dbd_prepared_t *statement, int nargs, const char **args)
int	apr_dbd_pselect (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_t *handle, apr_dbd_results_t **res, apr_dbd_prepared_t *statement, int random, int nargs, const char **args)
int	apr_dbd_pvquery (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_t *handle, int *nrows, apr_dbd_prepared_t *statement,...)
int	apr_dbd_pvselect (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_t *handle, apr_dbd_results_t **res, apr_dbd_prepared_t *statement, int random,...)
int	apr_dbd_pbquery (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_t *handle, int *nrows, apr_dbd_prepared_t *statement, const void **args)
int	apr_dbd_pbselect (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_t *handle, apr_dbd_results_t **res, apr_dbd_prepared_t *statement, int random, const void **args)
int	apr_dbd_pvbquery (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_t *handle, int *nrows, apr_dbd_prepared_t *statement,...)
int	apr_dbd_pvbselect (const apr_dbd_driver_t *driver, apr_pool_t *pool, apr_dbd_t *handle, apr_dbd_results_t **res, apr_dbd_prepared_t *statement, int random,...)
apr_status_t	apr_dbd_datum_get (const apr_dbd_driver_t *driver, apr_dbd_row_t *row, int col, apr_dbd_type_e type, void *data)

---

Define Documentation

#define APR_DBD_TRANSACTION_COMMIT   0x00

commit the transaction

#define APR_DBD_TRANSACTION_IGNORE_ERRORS   0x02

ignore transaction errors

#define APR_DBD_TRANSACTION_ROLLBACK   0x01

rollback the transaction

---

Enumeration Type Documentation

enum apr_dbd_type_e

Mapping of C to SQL types, used for prepared statements.

Remarks:

For apr_dbd_p[v]query/select functions, in and out parameters are always const char * (i.e. regular nul terminated strings). LOB types are passed with four (4) arguments: payload, length, table and column, all as const char *, where table and column are reserved for future use by Oracle.

For apr_dbd_p[v]bquery/select functions, in and out parameters are described next to each enumeration constant and are generally native binary types or some APR data type. LOB types are passed with four (4) arguments: payload (char*), length (apr_size_t*), table (char*) and column (char*). Table and column are reserved for future use by Oracle.

Enumerator:

APR_DBD_TYPE_TINY	%hhd : in, out: char*
APR_DBD_TYPE_UTINY	%hhu : in, out: unsigned char*
APR_DBD_TYPE_SHORT	%hd : in, out: short*
APR_DBD_TYPE_USHORT	%hu : in, out: unsigned short*
APR_DBD_TYPE_INT	%d : in, out: int*
APR_DBD_TYPE_UINT	%u : in, out: unsigned int*
APR_DBD_TYPE_LONG	%ld : in, out: long*
APR_DBD_TYPE_ULONG	%lu : in, out: unsigned long*
APR_DBD_TYPE_LONGLONG	%lld : in, out: apr_int64_t*
APR_DBD_TYPE_ULONGLONG	%llu : in, out: apr_uint64_t*
APR_DBD_TYPE_FLOAT	%f : in, out: float*
APR_DBD_TYPE_DOUBLE	%lf : in, out: double*
APR_DBD_TYPE_STRING	%s : in: char*, out: char**
APR_DBD_TYPE_TEXT	%pDt : in: char*, out: char**
APR_DBD_TYPE_TIME	%pDi : in: char*, out: char**
APR_DBD_TYPE_DATE	%pDd : in: char*, out: char**
APR_DBD_TYPE_DATETIME	%pDa : in: char*, out: char**
APR_DBD_TYPE_TIMESTAMP	%pDs : in: char*, out: char**
APR_DBD_TYPE_ZTIMESTAMP	%pDz : in: char*, out: char**
APR_DBD_TYPE_BLOB	%pDb : in: char* apr_size_t* char* char*, out: apr_bucket_brigade*
APR_DBD_TYPE_CLOB	%pDc : in: char* apr_size_t* char* char*, out: apr_bucket_brigade*
APR_DBD_TYPE_NULL	%pDn : in: void*, out: void**

---

Function Documentation

int apr_dbd_check_conn	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_t *	handle
	)

check_conn: check status of a database connection

Parameters:

	driver	- the driver
	pool	- working pool
	handle	- the connection to check

Returns:

APR_SUCCESS or error

apr_status_t apr_dbd_close	(	const apr_dbd_driver_t *	driver,
		apr_dbd_t *	handle
	)

apr_dbd_close: close a connection to a backend

Parameters:

	driver	- driver struct.
	handle	- handle to close

Returns:

APR_SUCCESS for success or error status

apr_status_t apr_dbd_datum_get	(	const apr_dbd_driver_t *	driver,
		apr_dbd_row_t *	row,
		int	col,
		apr_dbd_type_e	type,
		void *	data
	)

apr_dbd_datum_get: get a binary entry from a row

Parameters:

	driver	- the driver
	row	- row pointer
	col	- entry number
	type	- type of data to get
	data	- pointer to data, allocated by the caller

Returns:

APR_SUCCESS on success, APR_ENOENT if data is NULL or APR_EGENERAL

const char* apr_dbd_error	(	const apr_dbd_driver_t *	driver,
		apr_dbd_t *	handle,
		int	errnum
	)

apr_dbd_error: get current error message (if any)

Parameters:

	driver	- the driver
	handle	- the connection
	errnum	- error code from operation that returned an error

Returns:

the database current error message, or message for errnum (implementation-dependent whether errnum is ignored)

const char* apr_dbd_escape	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		const char *	string,
		apr_dbd_t *	handle
	)

apr_dbd_escape: escape a string so it is safe for use in query/select

Parameters:

	driver	- the driver
	pool	- pool to alloc the result from
	string	- the string to escape
	handle	- the connection

Returns:

the escaped, safe string

apr_status_t apr_dbd_get_driver	(	apr_pool_t *	pool,
		const char *	name,
		const apr_dbd_driver_t **	driver
	)

apr_dbd_get_driver: get the driver struct for a name

Parameters:

	pool	- (process) pool to register cleanup
	name	- driver name
	driver	- pointer to driver struct.

Returns:

APR_SUCCESS for success

APR_ENOTIMPL for no driver (when DSO not enabled)

APR_EDSOOPEN if DSO driver file can't be opened

APR_ESYMNOTFOUND if the driver file doesn't contain a driver

const char* apr_dbd_get_entry	(	const apr_dbd_driver_t *	driver,
		apr_dbd_row_t *	row,
		int	col
	)

apr_dbd_get_entry: get an entry from a row

Parameters:

	driver	- the driver
	row	- row pointer
	col	- entry number

Returns:

value from the row, or NULL if col is out of bounds.

const char* apr_dbd_get_name	(	const apr_dbd_driver_t *	driver,
		apr_dbd_results_t *	res,
		int	col
	)

apr_dbd_get_name: get an entry name from a result set

Parameters:

	driver	- the driver
	res	- result set pointer
	col	- entry number

Returns:

name of the entry, or NULL if col is out of bounds.

int apr_dbd_get_row	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_results_t *	res,
		apr_dbd_row_t **	row,
		int	rownum
	)

apr_dbd_get_row: get a row from a result set

Parameters:

	driver	- the driver
	pool	- pool to allocate the row
	res	- result set pointer
	row	- pointer to row pointer. May point to NULL on entry
	rownum	- row number (counting from 1), or -1 for "next row". Ignored if random access is not supported.

Returns:

0 for success, -1 for rownum out of range or data finished

apr_status_t apr_dbd_init

(

apr_pool_t *

pool

)

apr_dbd_init: perform once-only initialisation. Call once only.

Parameters:

pool

- pool to register any shutdown cleanups, etc

const char* apr_dbd_name

(

const apr_dbd_driver_t *

driver

)

apr_dbd_name: get the name of the driver

Parameters:

driver

- the driver

Returns:

- name

void* apr_dbd_native_handle	(	const apr_dbd_driver_t *	driver,
		apr_dbd_t *	handle
	)

apr_dbd_native_handle: get native database handle of the underlying db

Parameters:

	driver	- the driver
	handle	- apr_dbd handle

Returns:

- native handle

int apr_dbd_num_cols	(	const apr_dbd_driver_t *	driver,
		apr_dbd_results_t *	res
	)

apr_dbd_num_cols: get the number of columns in a results set

Parameters:

	driver	- the driver
	res	- result set.

Returns:

number of columns

int apr_dbd_num_tuples	(	const apr_dbd_driver_t *	driver,
		apr_dbd_results_t *	res
	)

apr_dbd_num_tuples: get the number of rows in a results set of a synchronous select

Parameters:

	driver	- the driver
	res	- result set.

Returns:

number of rows, or -1 if the results are asynchronous

apr_status_t apr_dbd_open	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		const char *	params,
		apr_dbd_t **	handle
	)

apr_dbd_open: open a connection to a backend

Parameters:

	driver	- driver struct.
	pool	- working pool
	params	- arguments to driver (implementation-dependent)
	handle	- pointer to handle to return

Returns:

APR_SUCCESS for success

APR_EGENERAL if driver exists but connection failed

See also:

apr_dbd_open_ex

apr_status_t apr_dbd_open_ex	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		const char *	params,
		apr_dbd_t **	handle,
		const char **	error
	)

apr_dbd_open_ex: open a connection to a backend

Parameters:

	driver	- driver struct.
	pool	- working pool
	params	- arguments to driver (implementation-dependent)
	handle	- pointer to handle to return
	error	- descriptive error.

Returns:

APR_SUCCESS for success

APR_EGENERAL if driver exists but connection failed

Remarks:

PostgreSQL: the params is passed directly to the PQconnectdb() function (check PostgreSQL documentation for more details on the syntax).

SQLite2: the params is split on a colon, with the first part used as the filename and second part converted to an integer and used as file mode.

SQLite3: the params is passed directly to the sqlite3_open() function as a filename to be opened (check SQLite3 documentation for more details).

Oracle: the params can have "user", "pass", "dbname" and "server" keys, each followed by an equal sign and a value. Such key/value pairs can be delimited by space, CR, LF, tab, semicolon, vertical bar or comma.

MySQL: the params can have "host", "port", "user", "pass", "dbname", "sock", "flags" "fldsz", "group" and "reconnect" keys, each followed by an equal sign and a value. Such key/value pairs can be delimited by space, CR, LF, tab, semicolon, vertical bar or comma. For now, "flags" can only recognise CLIENT_FOUND_ROWS (check MySQL manual for details). The value associated with "fldsz" determines maximum amount of memory (in bytes) for each of the fields in the result set of prepared statements. By default, this value is 1 MB. The value associated with "group" determines which group from configuration file to use (see MYSQL_READ_DEFAULT_GROUP option of mysql_options() in MySQL manual). Reconnect is set to 1 by default (i.e. true).

FreeTDS: the params can have "username", "password", "appname", "dbname", "host", "charset", "lang" and "server" keys, each followed by an equal sign and a value.

int apr_dbd_pbquery	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_t *	handle,
		int *	nrows,
		apr_dbd_prepared_t *	statement,
		const void **	args
	)

apr_dbd_pbquery: query using a prepared statement + binary args

Parameters:

	driver	- the driver
	pool	- working pool
	handle	- the connection
	nrows	- number of rows affected.
	statement	- the prepared statement to execute
	args	- binary args to prepared statement

Returns:

0 for success or error code

int apr_dbd_pbselect	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_t *	handle,
		apr_dbd_results_t **	res,
		apr_dbd_prepared_t *	statement,
		int	random,
		const void **	args
	)

apr_dbd_pbselect: select using a prepared statement + binary args

Parameters:

	driver	- the driver
	pool	- working pool
	handle	- the connection
	res	- pointer to query results. May point to NULL on entry
	statement	- the prepared statement to execute
	random	- Whether to support random-access to results
	args	- binary args to prepared statement

Returns:

0 for success or error code

int apr_dbd_pquery	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_t *	handle,
		int *	nrows,
		apr_dbd_prepared_t *	statement,
		int	nargs,
		const char **	args
	)

apr_dbd_pquery: query using a prepared statement + args

Parameters:

	driver	- the driver
	pool	- working pool
	handle	- the connection
	nrows	- number of rows affected.
	statement	- the prepared statement to execute
	nargs	- ignored (for backward compatibility only)
	args	- args to prepared statement

Returns:

0 for success or error code

int apr_dbd_prepare	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_t *	handle,
		const char *	query,
		const char *	label,
		apr_dbd_prepared_t **	statement
	)

apr_dbd_prepare: prepare a statement

Parameters:

	driver	- the driver
	pool	- pool to alloc the result from
	handle	- the connection
	query	- the SQL query
	label	- A label for the prepared statement. use NULL for temporary prepared statements (eg within a Request in httpd)
	statement	- statement to prepare. May point to null on entry.

Returns:

0 for success or error code

Remarks:

To specify parameters of the prepared query, use %s, %d etc. (see below for full list) in place of database specific parameter syntax (e.g. for PostgreSQL, this would be $1, $2, for SQLite3 this would be ? etc.). For instance: "SELECT name FROM customers WHERE name=%s" would be a query that this function understands.

Here is the full list of format specifiers that this function understands and what they map to in SQL: %hhd (TINY INT), %hhu (UNSIGNED TINY INT), %hd (SHORT), %hu (UNSIGNED SHORT), %d (INT), %u (UNSIGNED INT), %ld (LONG), %lu (UNSIGNED LONG), %lld (LONG LONG), %llu (UNSIGNED LONG LONG), %f (FLOAT, REAL), %lf (DOUBLE PRECISION), %s (VARCHAR), %pDt (TEXT), %pDi (TIME), %pDd (DATE), %pDa (DATETIME), %pDs (TIMESTAMP), %pDz (TIMESTAMP WITH TIME ZONE), %pDb (BLOB), %pDc (CLOB) and %pDn (NULL). Not all databases have support for all these types, so the underlying driver will attempt the "best match" where possible. A % followed by any letter not in the above list will be interpreted as VARCHAR (i.e. %s).

int apr_dbd_pselect	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_t *	handle,
		apr_dbd_results_t **	res,
		apr_dbd_prepared_t *	statement,
		int	random,
		int	nargs,
		const char **	args
	)

apr_dbd_pselect: select using a prepared statement + args

Parameters:

	driver	- the driver
	pool	- working pool
	handle	- the connection
	res	- pointer to query results. May point to NULL on entry
	statement	- the prepared statement to execute
	random	- Whether to support random-access to results
	nargs	- ignored (for backward compatibility only)
	args	- args to prepared statement

Returns:

0 for success or error code

int apr_dbd_pvbquery	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_t *	handle,
		int *	nrows,
		apr_dbd_prepared_t *	statement,
			...
	)

apr_dbd_pvbquery: query using a prepared statement + binary args

Parameters:

	driver	- the driver
	pool	- working pool
	handle	- the connection
	nrows	- number of rows affected.
	statement	- the prepared statement to execute
	...	- varargs list of binary args

Returns:

0 for success or error code

int apr_dbd_pvbselect	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_t *	handle,
		apr_dbd_results_t **	res,
		apr_dbd_prepared_t *	statement,
		int	random,
			...
	)

apr_dbd_pvbselect: select using a prepared statement + binary args

Parameters:

	driver	- the driver
	pool	- working pool
	handle	- the connection
	res	- pointer to query results. May point to NULL on entry
	statement	- the prepared statement to execute
	random	- Whether to support random-access to results
	...	- varargs list of binary args

Returns:

0 for success or error code

int apr_dbd_pvquery	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_t *	handle,
		int *	nrows,
		apr_dbd_prepared_t *	statement,
			...
	)

apr_dbd_pvquery: query using a prepared statement + args

Parameters:

	driver	- the driver
	pool	- working pool
	handle	- the connection
	nrows	- number of rows affected.
	statement	- the prepared statement to execute
	...	- varargs list

Returns:

0 for success or error code

int apr_dbd_pvselect	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_t *	handle,
		apr_dbd_results_t **	res,
		apr_dbd_prepared_t *	statement,
		int	random,
			...
	)

apr_dbd_pvselect: select using a prepared statement + args

Parameters:

	driver	- the driver
	pool	- working pool
	handle	- the connection
	res	- pointer to query results. May point to NULL on entry
	statement	- the prepared statement to execute
	random	- Whether to support random-access to results
	...	- varargs list

Returns:

0 for success or error code

int apr_dbd_query	(	const apr_dbd_driver_t *	driver,
		apr_dbd_t *	handle,
		int *	nrows,
		const char *	statement
	)

apr_dbd_query: execute an SQL query that doesn't return a result set

Parameters:

	driver	- the driver
	handle	- the connection
	nrows	- number of rows affected.
	statement	- the SQL statement to execute

Returns:

0 for success or error code

int apr_dbd_select	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_t *	handle,
		apr_dbd_results_t **	res,
		const char *	statement,
		int	random
	)

apr_dbd_select: execute an SQL query that returns a result set

Parameters:

	driver	- the driver
	pool	- pool to allocate the result set
	handle	- the connection
	res	- pointer to result set pointer. May point to NULL on entry
	statement	- the SQL statement to execute
	random	- 1 to support random access to results (seek any row); 0 to support only looping through results in order (async access - faster)

Returns:

0 for success or error code

int apr_dbd_set_dbname	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_t *	handle,
		const char *	name
	)

apr_dbd_set_dbname: select database name. May be a no-op if not supported.

Parameters:

	driver	- the driver
	pool	- working pool
	handle	- the connection
	name	- the database to select

Returns:

0 for success or error code

int apr_dbd_transaction_end	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_transaction_t *	trans
	)

apr_dbd_transaction_end: end a transaction (commit on success, rollback on error). May be a no-op.

Parameters:

	driver	- the driver
	handle	- the db connection
	trans	- the transaction.

Returns:

0 for success or error code

int apr_dbd_transaction_mode_get	(	const apr_dbd_driver_t *	driver,
		apr_dbd_transaction_t *	trans
	)

apr_dbd_transaction_mode_get: get the mode of transaction

Parameters:

	driver	- the driver
	trans	- the transaction

Returns:

mode of transaction

int apr_dbd_transaction_mode_set	(	const apr_dbd_driver_t *	driver,
		apr_dbd_transaction_t *	trans,
		int	mode
	)

apr_dbd_transaction_mode_set: set the mode of transaction

Parameters:

	driver	- the driver
	trans	- the transaction
	mode	- new mode of the transaction

Returns:

the mode of transaction in force after the call

int apr_dbd_transaction_start	(	const apr_dbd_driver_t *	driver,
		apr_pool_t *	pool,
		apr_dbd_t *	handle,
		apr_dbd_transaction_t **	trans
	)

apr_dbd_transaction_start: start a transaction. May be a no-op.

Parameters:

	driver	- the driver
	pool	- a pool to use for error messages (if any).
	handle	- the db connection
	trans	- ptr to a transaction. May be null on entry

Returns:

0 for success or error code

Remarks:

Note that transaction modes, set by calling apr_dbd_transaction_mode_set(), will affect all query/select calls within a transaction. By default, any error in query/select during a transaction will cause the transaction to inherit the error code and any further query/select calls will fail immediately. Put transaction in "ignore errors" mode to avoid that. Use "rollback" mode to do explicit rollback.