Apache Portable Runtime Utility Library
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DBD routines
APR Utility Functions

Macros

#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)

Detailed Description

Macro Definition 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

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