SQL_COPT_INMEMORY_TRUSTSTORECERT is a pre-connection attribute that specifies the contents of the TLS/SSL certificates for TLS/SSL server authentication. When using SQL_COPT_INMEMORY_TRUSTSTORECERT, the driver stores the certificate content in memory, which eliminates the need to store the truststore file on the disk and lets applications use TLS/SSL server authentication without any disk dependency.

Note: The certificate content can be specified using the Trust Store (Truststore) connection option as well. However, if it is specified using both Trust Store and SQL_COPT_INMEMORY_TRUSTSTORECERT, SQL_COPT_INMEMORY_TRUSTSTORECERT takes precedence over Trust Store.
The following example shows how to specify the contents of 3 certificates using SQL_COPT_INMEMORY_TRUSTSTORECERT:

SQLCHAR certificate[] = "
-----BEGIN CERTIFICATE-----12345abc-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----abcd123456-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----aabbcc11----END CERTIFICATE-----";
//The content of each certificate must be specified between -----BEGIN CERTIFICATE----- and -----END CERTIFICATE-----. Also, the number of dashes (-----) must be the same before and after both BEGIN CERTIFICATE and END CERTIFICATE.
 
...

SQLSetConnectAttr(dbc, SQL_COPT_INMEMORY_TRUSTSTORECERT, (SQLPOINTER)certificate, SQL_IS_POINTER);

ret = SQLDriverConnect(dbc, NULL,
(SQLCHAR*)"DSN=PostgreSQLWP_SSL;UID=jsmith;PWD=secret", SQL_NTS,
NULL, 0, NULL, SQL_DRIVER_NOPROMPT);