Function main

examples/interfaces/13.null_pk.cpp:35–153

static IMaster* master = fb_get_master_interface();

int main()
{
	int rc = 0;

	// set default password if none specified in environment
	setenv("ISC_USER", "sysdba", 0);
	setenv("ISC_PASSWORD", "masterkey", 0);

	// status vector and main dispatcher
	ThrowStatusWrapper status(master->getStatus());
	IProvider* prov = master->getDispatcher();

	// declare pointers to required interfaces
	IAttachment* att = NULL;
	ITransaction* tra = NULL;

	// Interface executes prepared SQL statement
	IStatement* stmt = NULL;

	// Interfaces provides access to format of data in messages
	IMessageMetadata* meta = NULL;

	// Interface makes it possible to change format of data or define it yourself
	IMetadataBuilder* builder = NULL;

	const char* sqlStr =
	    "Insert into COUNTRY values(?, ?)";

	try
	{
		// attach employee db
		att = prov->attachDatabase(&status, "employee", 0, NULL);

		// start transaction
		tra = att->startTransaction(&status, 0, NULL);

		// prepare statement
		stmt = att->prepare(&status, tra, 0, sqlStr, SAMPLES_DIALECT, 0);

		// build metadata
		meta = stmt->getInputMetadata(&status);
		builder = meta->getBuilder(&status);

		// set nullability on fields
		for (unsigned n = 0; n < meta->getCount(&status); ++n)
		{
			unsigned t = meta->getType(&status, n);
			builder->setType(&status, n, t | 1);
		}

		// IMetadata should be ready
		meta->release();
		meta = NULL;
		meta = builder->getMetadata(&status);

		// no need in builder any more
		builder->release();
		builder = NULL;