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ODBC transaction support

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@177320 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Tilghman Lesher
2009-02-19 00:26:01 +00:00
parent a150908f3f
commit a1f583177e
5 changed files with 854 additions and 87 deletions
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39
funcs/func_odbc.c
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@@ -2,6 +2,7 @@
* Asterisk -- An open source telephony toolkit.
*
* Copyright (c) 2005, 2006 Tilghman Lesher
* Copyright (c) 2008 Digium, Inc.
*
* Tilghman Lesher <func_odbc__200508@the-tilghman.com>
*
@@ -205,6 +206,7 @@ static int acf_odbc_write(struct ast_channel *chan, const char *cmd, char *s, co
struct acf_odbc_query *query;
char *t, varname[15];
int i, dsn, bogus_chan = 0;
int transactional = 0;
AST_DECLARE_APP_ARGS(values,
AST_APP_ARG(field)[100];
);
@@ -293,16 +295,32 @@ static int acf_odbc_write(struct ast_channel *chan, const char *cmd, char *s, co
}
pbx_builtin_setvar_helper(chan, "VALUE", NULL);
/*!\note
* Okay, this part is confusing. Transactions belong to a single database
* handle. Therefore, when working with transactions, we CANNOT failover
* to multiple DSNs. We MUST have a single handle all the way through the
* transaction, or else we CANNOT enforce atomicity.
*/
for (dsn = 0; dsn < 5; dsn++) {
if (!ast_strlen_zero(query->writehandle[dsn])) {
obj = ast_odbc_request_obj(query->writehandle[dsn], 0);
if (obj)
stmt = ast_odbc_direct_execute(obj, generic_execute, ast_str_buffer(buf));
if (transactional) {
/* This can only happen second time through or greater. */
ast_log(LOG_WARNING, "Transactions do not work well with multiple DSNs for 'writehandle'\n");
}
if (stmt) {
status = "SUCCESS";
SQLRowCount(stmt, &rows);
break;
if (!ast_strlen_zero(query->writehandle[dsn])) {
if ((obj = ast_odbc_retrieve_transaction_obj(chan, query->writehandle[dsn]))) {
transactional = 1;
} else {
obj = ast_odbc_request_obj(query->writehandle[dsn], 0);
transactional = 0;
}
if (obj && (stmt = ast_odbc_direct_execute(obj, generic_execute, ast_str_buffer(buf)))) {
break;
}
}
if (obj && !transactional) {
ast_odbc_release_obj(obj);
}
}
@@ -322,6 +340,9 @@ static int acf_odbc_write(struct ast_channel *chan, const char *cmd, char *s, co
break;
}
}
} else if (stmt) {
status = "SUCCESS";
SQLRowCount(stmt, &rows);
}
AST_RWLIST_UNLOCK(&queries);
@@ -338,7 +359,7 @@ static int acf_odbc_write(struct ast_channel *chan, const char *cmd, char *s, co
SQLCloseCursor(stmt);
SQLFreeHandle(SQL_HANDLE_STMT, stmt);
}
if (obj) {
if (obj && !transactional) {
ast_odbc_release_obj(obj);
obj = NULL;
}