550 lines
23 KiB
C
550 lines
23 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* Overview of what this is and does:
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* http://www.apache.org/~niq/dbd.html
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*/
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#ifndef APR_DBD_H
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#define APR_DBD_H
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#include "apu.h"
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#include "apr_pools.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @file apr_dbd.h
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* @brief APR-UTIL DBD library
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*/
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/**
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* @defgroup APR_Util_DBD DBD routines
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* @ingroup APR_Util
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* @{
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*/
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/**
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* Mapping of C to SQL types, used for prepared statements.
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* @remarks
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* For apr_dbd_p[v]query/select functions, in and out parameters are always
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* const char * (i.e. regular nul terminated strings). LOB types are passed
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* with four (4) arguments: payload, length, table and column, all as const
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* char *, where table and column are reserved for future use by Oracle.
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* @remarks
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* For apr_dbd_p[v]bquery/select functions, in and out parameters are
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* described next to each enumeration constant and are generally native binary
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* types or some APR data type. LOB types are passed with four (4) arguments:
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* payload (char*), length (apr_size_t*), table (char*) and column (char*).
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* Table and column are reserved for future use by Oracle.
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*/
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typedef enum {
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APR_DBD_TYPE_NONE,
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APR_DBD_TYPE_TINY, /**< \%hhd : in, out: char* */
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APR_DBD_TYPE_UTINY, /**< \%hhu : in, out: unsigned char* */
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APR_DBD_TYPE_SHORT, /**< \%hd : in, out: short* */
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APR_DBD_TYPE_USHORT, /**< \%hu : in, out: unsigned short* */
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APR_DBD_TYPE_INT, /**< \%d : in, out: int* */
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APR_DBD_TYPE_UINT, /**< \%u : in, out: unsigned int* */
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APR_DBD_TYPE_LONG, /**< \%ld : in, out: long* */
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APR_DBD_TYPE_ULONG, /**< \%lu : in, out: unsigned long* */
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APR_DBD_TYPE_LONGLONG, /**< \%lld : in, out: apr_int64_t* */
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APR_DBD_TYPE_ULONGLONG, /**< \%llu : in, out: apr_uint64_t* */
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APR_DBD_TYPE_FLOAT, /**< \%f : in, out: float* */
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APR_DBD_TYPE_DOUBLE, /**< \%lf : in, out: double* */
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APR_DBD_TYPE_STRING, /**< \%s : in: char*, out: char** */
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APR_DBD_TYPE_TEXT, /**< \%pDt : in: char*, out: char** */
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APR_DBD_TYPE_TIME, /**< \%pDi : in: char*, out: char** */
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APR_DBD_TYPE_DATE, /**< \%pDd : in: char*, out: char** */
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APR_DBD_TYPE_DATETIME, /**< \%pDa : in: char*, out: char** */
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APR_DBD_TYPE_TIMESTAMP, /**< \%pDs : in: char*, out: char** */
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APR_DBD_TYPE_ZTIMESTAMP, /**< \%pDz : in: char*, out: char** */
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APR_DBD_TYPE_BLOB, /**< \%pDb : in: char* apr_size_t* char* char*, out: apr_bucket_brigade* */
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APR_DBD_TYPE_CLOB, /**< \%pDc : in: char* apr_size_t* char* char*, out: apr_bucket_brigade* */
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APR_DBD_TYPE_NULL /**< \%pDn : in: void*, out: void** */
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} apr_dbd_type_e;
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/* These are opaque structs. Instantiation is up to each backend */
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typedef struct apr_dbd_driver_t apr_dbd_driver_t;
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typedef struct apr_dbd_t apr_dbd_t;
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typedef struct apr_dbd_transaction_t apr_dbd_transaction_t;
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typedef struct apr_dbd_results_t apr_dbd_results_t;
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typedef struct apr_dbd_row_t apr_dbd_row_t;
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typedef struct apr_dbd_prepared_t apr_dbd_prepared_t;
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/** apr_dbd_init: perform once-only initialisation. Call once only.
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*
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* @param pool - pool to register any shutdown cleanups, etc
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*/
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APU_DECLARE(apr_status_t) apr_dbd_init(apr_pool_t *pool);
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/** apr_dbd_get_driver: get the driver struct for a name
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*
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* @param pool - (process) pool to register cleanup
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* @param name - driver name
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* @param driver - pointer to driver struct.
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* @return APR_SUCCESS for success
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* @return APR_ENOTIMPL for no driver (when DSO not enabled)
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* @return APR_EDSOOPEN if DSO driver file can't be opened
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* @return APR_ESYMNOTFOUND if the driver file doesn't contain a driver
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*/
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APU_DECLARE(apr_status_t) apr_dbd_get_driver(apr_pool_t *pool, const char *name,
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const apr_dbd_driver_t **driver);
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/** apr_dbd_open_ex: open a connection to a backend
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*
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* @param driver - driver struct.
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* @param pool - working pool
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* @param params - arguments to driver (implementation-dependent)
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* @param handle - pointer to handle to return
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* @param error - descriptive error.
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* @return APR_SUCCESS for success
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* @return APR_EGENERAL if driver exists but connection failed
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* @remarks PostgreSQL: the params is passed directly to the PQconnectdb()
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* function (check PostgreSQL documentation for more details on the syntax).
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* @remarks SQLite2: the params is split on a colon, with the first part used
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* as the filename and second part converted to an integer and used as file
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* mode.
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* @remarks SQLite3: the params is passed directly to the sqlite3_open()
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* function as a filename to be opened (check SQLite3 documentation for more
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* details).
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* @remarks Oracle: the params can have "user", "pass", "dbname" and "server"
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* keys, each followed by an equal sign and a value. Such key/value pairs can
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* be delimited by space, CR, LF, tab, semicolon, vertical bar or comma.
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* @remarks MySQL: the params can have "host", "port", "user", "pass",
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* "dbname", "sock", "flags" "fldsz", "group" and "reconnect" keys, each
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* followed by an equal sign and a value. Such key/value pairs can be
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* delimited by space, CR, LF, tab, semicolon, vertical bar or comma. For
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* now, "flags" can only recognise CLIENT_FOUND_ROWS (check MySQL manual for
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* details). The value associated with "fldsz" determines maximum amount of
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* memory (in bytes) for each of the fields in the result set of prepared
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* statements. By default, this value is 1 MB. The value associated with
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* "group" determines which group from configuration file to use (see
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* MYSQL_READ_DEFAULT_GROUP option of mysql_options() in MySQL manual).
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* Reconnect is set to 1 by default (i.e. true).
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*/
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APU_DECLARE(apr_status_t) apr_dbd_open_ex(const apr_dbd_driver_t *driver,
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apr_pool_t *pool, const char *params,
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apr_dbd_t **handle,
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const char **error);
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/** apr_dbd_open: open a connection to a backend
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*
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* @param driver - driver struct.
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* @param pool - working pool
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* @param params - arguments to driver (implementation-dependent)
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* @param handle - pointer to handle to return
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* @return APR_SUCCESS for success
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* @return APR_EGENERAL if driver exists but connection failed
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* @see apr_dbd_open_ex
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*/
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APU_DECLARE(apr_status_t) apr_dbd_open(const apr_dbd_driver_t *driver,
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apr_pool_t *pool, const char *params,
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apr_dbd_t **handle);
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/** apr_dbd_close: close a connection to a backend
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*
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* @param driver - driver struct.
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* @param handle - handle to close
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* @return APR_SUCCESS for success or error status
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*/
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APU_DECLARE(apr_status_t) apr_dbd_close(const apr_dbd_driver_t *driver,
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apr_dbd_t *handle);
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/* apr-function-shaped versions of things */
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/** apr_dbd_name: get the name of the driver
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*
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* @param driver - the driver
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* @return - name
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*/
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APU_DECLARE(const char*) apr_dbd_name(const apr_dbd_driver_t *driver);
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/** apr_dbd_native_handle: get native database handle of the underlying db
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*
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* @param driver - the driver
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* @param handle - apr_dbd handle
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* @return - native handle
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*/
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APU_DECLARE(void*) apr_dbd_native_handle(const apr_dbd_driver_t *driver,
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apr_dbd_t *handle);
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/** check_conn: check status of a database connection
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*
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* @param driver - the driver
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* @param pool - working pool
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* @param handle - the connection to check
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* @return APR_SUCCESS or error
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*/
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APU_DECLARE(int) apr_dbd_check_conn(const apr_dbd_driver_t *driver, apr_pool_t *pool,
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apr_dbd_t *handle);
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/** apr_dbd_set_dbname: select database name. May be a no-op if not supported.
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*
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* @param driver - the driver
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* @param pool - working pool
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* @param handle - the connection
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* @param name - the database to select
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* @return 0 for success or error code
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*/
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APU_DECLARE(int) apr_dbd_set_dbname(const apr_dbd_driver_t *driver, apr_pool_t *pool,
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apr_dbd_t *handle, const char *name);
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/** apr_dbd_transaction_start: start a transaction. May be a no-op.
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*
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* @param driver - the driver
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* @param pool - a pool to use for error messages (if any).
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* @param handle - the db connection
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* @param trans - ptr to a transaction. May be null on entry
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* @return 0 for success or error code
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* @remarks Note that transaction modes, set by calling
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* apr_dbd_transaction_mode_set(), will affect all query/select calls within
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* a transaction. By default, any error in query/select during a transaction
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* will cause the transaction to inherit the error code and any further
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* query/select calls will fail immediately. Put transaction in "ignore
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* errors" mode to avoid that. Use "rollback" mode to do explicit rollback.
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*/
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APU_DECLARE(int) apr_dbd_transaction_start(const apr_dbd_driver_t *driver,
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apr_pool_t *pool,
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apr_dbd_t *handle,
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apr_dbd_transaction_t **trans);
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/** apr_dbd_transaction_end: end a transaction
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* (commit on success, rollback on error).
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* May be a no-op.
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*
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* @param driver - the driver
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* @param handle - the db connection
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* @param trans - the transaction.
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* @return 0 for success or error code
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*/
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APU_DECLARE(int) apr_dbd_transaction_end(const apr_dbd_driver_t *driver,
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apr_pool_t *pool,
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apr_dbd_transaction_t *trans);
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#define APR_DBD_TRANSACTION_COMMIT 0x00 /**< commit the transaction */
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#define APR_DBD_TRANSACTION_ROLLBACK 0x01 /**< rollback the transaction */
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#define APR_DBD_TRANSACTION_IGNORE_ERRORS 0x02 /**< ignore transaction errors */
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/** apr_dbd_transaction_mode_get: get the mode of transaction
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*
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* @param driver - the driver
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* @param trans - the transaction
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* @return mode of transaction
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*/
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APU_DECLARE(int) apr_dbd_transaction_mode_get(const apr_dbd_driver_t *driver,
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apr_dbd_transaction_t *trans);
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/** apr_dbd_transaction_mode_set: set the mode of transaction
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*
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* @param driver - the driver
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* @param trans - the transaction
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* @param mode - new mode of the transaction
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* @return the mode of transaction in force after the call
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*/
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APU_DECLARE(int) apr_dbd_transaction_mode_set(const apr_dbd_driver_t *driver,
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apr_dbd_transaction_t *trans,
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int mode);
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/** apr_dbd_query: execute an SQL query that doesn't return a result set
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*
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* @param driver - the driver
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* @param handle - the connection
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* @param nrows - number of rows affected.
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* @param statement - the SQL statement to execute
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* @return 0 for success or error code
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*/
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APU_DECLARE(int) apr_dbd_query(const apr_dbd_driver_t *driver, apr_dbd_t *handle,
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int *nrows, const char *statement);
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/** apr_dbd_select: execute an SQL query that returns a result set
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*
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* @param driver - the driver
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* @param pool - pool to allocate the result set
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* @param handle - the connection
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* @param res - pointer to result set pointer. May point to NULL on entry
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* @param statement - the SQL statement to execute
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* @param random - 1 to support random access to results (seek any row);
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* 0 to support only looping through results in order
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* (async access - faster)
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* @return 0 for success or error code
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*/
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APU_DECLARE(int) apr_dbd_select(const apr_dbd_driver_t *driver, apr_pool_t *pool,
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apr_dbd_t *handle, apr_dbd_results_t **res,
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const char *statement, int random);
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/** apr_dbd_num_cols: get the number of columns in a results set
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*
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* @param driver - the driver
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* @param res - result set.
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* @return number of columns
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*/
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APU_DECLARE(int) apr_dbd_num_cols(const apr_dbd_driver_t *driver,
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apr_dbd_results_t *res);
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/** apr_dbd_num_tuples: get the number of rows in a results set
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* of a synchronous select
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*
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* @param driver - the driver
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* @param res - result set.
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* @return number of rows, or -1 if the results are asynchronous
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*/
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APU_DECLARE(int) apr_dbd_num_tuples(const apr_dbd_driver_t *driver,
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apr_dbd_results_t *res);
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/** apr_dbd_get_row: get a row from a result set
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*
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* @param driver - the driver
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* @param pool - pool to allocate the row
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* @param res - result set pointer
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* @param row - pointer to row pointer. May point to NULL on entry
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* @param rownum - row number (counting from 1), or -1 for "next row".
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* Ignored if random access is not supported.
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* @return 0 for success, -1 for rownum out of range or data finished
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*/
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APU_DECLARE(int) apr_dbd_get_row(const apr_dbd_driver_t *driver, apr_pool_t *pool,
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apr_dbd_results_t *res, apr_dbd_row_t **row,
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int rownum);
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/** apr_dbd_get_entry: get an entry from a row
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*
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* @param driver - the driver
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* @param row - row pointer
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* @param col - entry number
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* @return value from the row, or NULL if col is out of bounds.
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*/
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APU_DECLARE(const char*) apr_dbd_get_entry(const apr_dbd_driver_t *driver,
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apr_dbd_row_t *row, int col);
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/** apr_dbd_get_name: get an entry name from a result set
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*
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* @param driver - the driver
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* @param res - result set pointer
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* @param col - entry number
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* @return name of the entry, or NULL if col is out of bounds.
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*/
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APU_DECLARE(const char*) apr_dbd_get_name(const apr_dbd_driver_t *driver,
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apr_dbd_results_t *res, int col);
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/** apr_dbd_error: get current error message (if any)
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*
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* @param driver - the driver
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* @param handle - the connection
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* @param errnum - error code from operation that returned an error
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* @return the database current error message, or message for errnum
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* (implementation-dependent whether errnum is ignored)
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*/
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APU_DECLARE(const char*) apr_dbd_error(const apr_dbd_driver_t *driver,
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apr_dbd_t *handle, int errnum);
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/** apr_dbd_escape: escape a string so it is safe for use in query/select
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*
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* @param driver - the driver
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* @param pool - pool to alloc the result from
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* @param string - the string to escape
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* @param handle - the connection
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* @return the escaped, safe string
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*/
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APU_DECLARE(const char*) apr_dbd_escape(const apr_dbd_driver_t *driver,
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apr_pool_t *pool, const char *string,
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apr_dbd_t *handle);
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/** apr_dbd_prepare: prepare a statement
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*
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* @param driver - the driver
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* @param pool - pool to alloc the result from
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* @param handle - the connection
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* @param query - the SQL query
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* @param label - A label for the prepared statement.
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* use NULL for temporary prepared statements
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* (eg within a Request in httpd)
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* @param statement - statement to prepare. May point to null on entry.
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* @return 0 for success or error code
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* @remarks To specify parameters of the prepared query, use \%s, \%d etc.
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* (see below for full list) in place of database specific parameter syntax
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* (e.g. for PostgreSQL, this would be $1, $2, for SQLite3 this would be ?
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* etc.). For instance: "SELECT name FROM customers WHERE name=%s" would be
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* a query that this function understands.
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* @remarks Here is the full list of format specifiers that this function
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* understands and what they map to in SQL: \%hhd (TINY INT), \%hhu (UNSIGNED
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* TINY INT), \%hd (SHORT), \%hu (UNSIGNED SHORT), \%d (INT), \%u (UNSIGNED
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* INT), \%ld (LONG), \%lu (UNSIGNED LONG), \%lld (LONG LONG), \%llu
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* (UNSIGNED LONG LONG), \%f (FLOAT, REAL), \%lf (DOUBLE PRECISION), \%s
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* (VARCHAR), \%pDt (TEXT), \%pDi (TIME), \%pDd (DATE), \%pDa (DATETIME),
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* \%pDs (TIMESTAMP), \%pDz (TIMESTAMP WITH TIME ZONE), \%pDb (BLOB), \%pDc
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* (CLOB) and \%pDn (NULL). Not all databases have support for all these
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* types, so the underlying driver will attempt the "best match" where
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* possible. A \% followed by any letter not in the above list will be
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* interpreted as VARCHAR (i.e. \%s).
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*/
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APU_DECLARE(int) apr_dbd_prepare(const apr_dbd_driver_t *driver, apr_pool_t *pool,
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apr_dbd_t *handle, const char *query,
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const char *label,
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apr_dbd_prepared_t **statement);
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/** apr_dbd_pquery: query using a prepared statement + args
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*
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* @param driver - the driver
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* @param pool - working pool
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* @param handle - the connection
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* @param nrows - number of rows affected.
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* @param statement - the prepared statement to execute
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* @param nargs - ignored (for backward compatibility only)
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* @param args - args to prepared statement
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* @return 0 for success or error code
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*/
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APU_DECLARE(int) apr_dbd_pquery(const apr_dbd_driver_t *driver, apr_pool_t *pool,
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apr_dbd_t *handle, int *nrows,
|
|
apr_dbd_prepared_t *statement, int nargs,
|
|
const char **args);
|
|
|
|
/** apr_dbd_pselect: select using a prepared statement + args
|
|
*
|
|
* @param driver - the driver
|
|
* @param pool - working pool
|
|
* @param handle - the connection
|
|
* @param res - pointer to query results. May point to NULL on entry
|
|
* @param statement - the prepared statement to execute
|
|
* @param random - Whether to support random-access to results
|
|
* @param nargs - ignored (for backward compatibility only)
|
|
* @param args - args to prepared statement
|
|
* @return 0 for success or error code
|
|
*/
|
|
APU_DECLARE(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_pvquery: query using a prepared statement + args
|
|
*
|
|
* @param driver - the driver
|
|
* @param pool - working pool
|
|
* @param handle - the connection
|
|
* @param nrows - number of rows affected.
|
|
* @param statement - the prepared statement to execute
|
|
* @param ... - varargs list
|
|
* @return 0 for success or error code
|
|
*/
|
|
APU_DECLARE_NONSTD(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_pvselect: select using a prepared statement + args
|
|
*
|
|
* @param driver - the driver
|
|
* @param pool - working pool
|
|
* @param handle - the connection
|
|
* @param res - pointer to query results. May point to NULL on entry
|
|
* @param statement - the prepared statement to execute
|
|
* @param random - Whether to support random-access to results
|
|
* @param ... - varargs list
|
|
* @return 0 for success or error code
|
|
*/
|
|
APU_DECLARE_NONSTD(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_pbquery: query using a prepared statement + binary args
|
|
*
|
|
* @param driver - the driver
|
|
* @param pool - working pool
|
|
* @param handle - the connection
|
|
* @param nrows - number of rows affected.
|
|
* @param statement - the prepared statement to execute
|
|
* @param args - binary args to prepared statement
|
|
* @return 0 for success or error code
|
|
*/
|
|
APU_DECLARE(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_pbselect: select using a prepared statement + binary args
|
|
*
|
|
* @param driver - the driver
|
|
* @param pool - working pool
|
|
* @param handle - the connection
|
|
* @param res - pointer to query results. May point to NULL on entry
|
|
* @param statement - the prepared statement to execute
|
|
* @param random - Whether to support random-access to results
|
|
* @param args - binary args to prepared statement
|
|
* @return 0 for success or error code
|
|
*/
|
|
APU_DECLARE(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_pvbquery: query using a prepared statement + binary args
|
|
*
|
|
* @param driver - the driver
|
|
* @param pool - working pool
|
|
* @param handle - the connection
|
|
* @param nrows - number of rows affected.
|
|
* @param statement - the prepared statement to execute
|
|
* @param ... - varargs list of binary args
|
|
* @return 0 for success or error code
|
|
*/
|
|
APU_DECLARE_NONSTD(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_pvbselect: select using a prepared statement + binary args
|
|
*
|
|
* @param driver - the driver
|
|
* @param pool - working pool
|
|
* @param handle - the connection
|
|
* @param res - pointer to query results. May point to NULL on entry
|
|
* @param statement - the prepared statement to execute
|
|
* @param random - Whether to support random-access to results
|
|
* @param ... - varargs list of binary args
|
|
* @return 0 for success or error code
|
|
*/
|
|
APU_DECLARE_NONSTD(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_datum_get: get a binary entry from a row
|
|
*
|
|
* @param driver - the driver
|
|
* @param row - row pointer
|
|
* @param col - entry number
|
|
* @param type - type of data to get
|
|
* @param data - pointer to data, allocated by the caller
|
|
* @return APR_SUCCESS on success, APR_ENOENT if data is NULL or APR_EGENERAL
|
|
*/
|
|
APU_DECLARE(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);
|
|
|
|
/** @} */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|