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Check liveness in PDO_ODBC #6805

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Check liveness in PDO_ODBC #6805

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a8c12dc
Check liveness in PDO_ODBC
NattyNarwhal Mar 23, 2021
9a59d24
style nitpick
NattyNarwhal Mar 26, 2021
6254505
Use the proper connection dead check in PDO_ODBC
NattyNarwhal Mar 26, 2021
12bcc69
Revert back to using SQLGetInfo for PDO_ODBC
NattyNarwhal Mar 30, 2021
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17 changes: 16 additions & 1 deletion ext/pdo_odbc/odbc_driver.c
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Original file line number Diff line number Diff line change
Expand Up @@ -372,6 +372,21 @@ static int odbc_handle_get_attr(pdo_dbh_t *dbh, zend_long attr, zval *val)
return 0;
}

static zend_result odbc_handle_check_liveness(pdo_dbh_t *dbh)
{
RETCODE ret;
SQLUINTEGER dead;
pdo_odbc_db_handle *H = (pdo_odbc_db_handle *)dbh->driver_data;

/* ODBC 3.5; procedural ODBC uses SQLGetInfo read only instead */
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Oh, you're right, SQL_ATTR_CONNECTION_DEAD is ODBC 3.5. We may need a fallback for ODBC 3.0 (maybe just not checking the liveliness there is okay).

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Yeah, I'm not having much luck with the Db2i driver on Linux; it reconnects, but dead returns both SQL_SUCCESS and dead == 0 (SQL_CD_FALSE). (And a segfault at the end, but I can only assume that might be my fault for running bleeding-edge Fedora.) I can try it on i directly too, but it's the same codebase on both.

If drivers can't report their dead status reliably, maybe using SQLGetInfo only or to verify if the driver is correct would work.

ret = SQLGetConnectAttr(H->dbc, SQL_ATTR_CONNECTION_DEAD, &dead, 0, NULL);

if (ret != SQL_SUCCESS || dead == SQL_CD_TRUE) {
return FAILURE;
}
return SUCCESS;
}

static const struct pdo_dbh_methods odbc_methods = {
odbc_handle_closer,
odbc_handle_preparer,
Expand All @@ -384,7 +399,7 @@ static const struct pdo_dbh_methods odbc_methods = {
NULL, /* last id */
pdo_odbc_fetch_error_func,
odbc_handle_get_attr, /* get attr */
NULL, /* check_liveness */
odbc_handle_check_liveness, /* check_liveness */
NULL, /* get_driver_methods */
NULL, /* request_shutdown */
NULL, /* in transaction, use PDO's internal tracking mechanism */
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