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104 lines
4.1 KiB
C
104 lines
4.1 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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* Copyright (C) 2004 - 2005, Anthony Minessale II
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* Copyright (C) 2006, Tilghman Lesher
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*
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* Mark Spencer <markster@digium.com>
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* Anthony Minessale <anthmct@yahoo.com>
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* Tilghman Lesher <res_odbc_200603@the-tilghman.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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* \brief ODBC resource manager
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*/
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#ifndef _ASTERISK_RES_ODBC_H
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#define _ASTERISK_RES_ODBC_H
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#include <sql.h>
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#include <sqlext.h>
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#include <sqltypes.h>
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typedef enum { ODBC_SUCCESS=0, ODBC_FAIL=-1} odbc_status;
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struct odbc_obj {
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ast_mutex_t lock;
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SQLHDBC con; /* ODBC Connection Handle */
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struct odbc_class *parent; /* Information about the connection is protected */
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struct timeval last_used;
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unsigned int used:1;
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unsigned int up:1;
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AST_LIST_ENTRY(odbc_obj) list;
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};
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/* functions */
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/*! \brief Executes a prepared statement handle
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* \param obj The non-NULL result of odbc_request_obj()
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* \param stmt The prepared statement handle
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* \return Returns 0 on success or -1 on failure
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*
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* This function was originally designed simply to execute a prepared
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* statement handle and to retry if the initial execution failed.
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* Unfortunately, it did this by disconnecting and reconnecting the database
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* handle which on most databases causes the statement handle to become
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* invalid. Therefore, this method has been deprecated in favor of
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* odbc_prepare_and_execute() which allows the statement to be prepared
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* multiple times, if necessary, in case of a loss of connection.
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*
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* This function really only ever worked with MySQL, where the statement handle is
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* not prepared on the server. If you are not using MySQL, you should avoid it.
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*/
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int ast_odbc_smart_execute(struct odbc_obj *obj, SQLHSTMT stmt) __attribute__((deprecated));
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/*! \brief Retrieves a connected ODBC object
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* \param name The name of the ODBC class for which a connection is needed.
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* \param check Whether to ensure that a connection is valid before returning the handle. Usually unnecessary.
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* \return Returns an ODBC object or NULL if there is no connection available with the requested name.
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*
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* Connection classes may, in fact, contain multiple connection handles. If
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* the connection is pooled, then each connection will be dedicated to the
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* thread which requests it. Note that all connections should be released
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* when the thread is done by calling odbc_release_obj(), below.
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*/
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struct odbc_obj *ast_odbc_request_obj(const char *name, int check);
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/*! \brief Releases an ODBC object previously allocated by odbc_request_obj()
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* \param obj The ODBC object
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*/
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void ast_odbc_release_obj(struct odbc_obj *obj);
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/*! \brief Checks an ODBC object to ensure it is still connected
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* \param obj The ODBC object
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* \return Returns 0 if connected, -1 otherwise.
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*/
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int ast_odbc_sanity_check(struct odbc_obj *obj);
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/*! \brief Checks if the database natively supports backslash as an escape character.
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* \param obj The ODBC object
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* \return Returns 1 if backslash is a native escape character, 0 if an ESCAPE clause is needed to support '\'
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*/
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int ast_odbc_backslash_is_escape(struct odbc_obj *obj);
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/*! \brief Prepares, executes, and returns the resulting statement handle.
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* \param obj The ODBC object
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* \param prepare_cb A function callback, which, when called, should return a statement handle prepared, with any necessary parameters or result columns bound.
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* \param data A parameter to be passed to the prepare_cb parameter function, indicating which statement handle is to be prepared.
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* \return Returns a statement handle or NULL on error.
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*/
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SQLHSTMT ast_odbc_prepare_and_execute(struct odbc_obj *obj, SQLHSTMT (*prepare_cb)(struct odbc_obj *obj, void *data), void *data);
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#endif /* _ASTERISK_RES_ODBC_H */
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