test_desc.pgc

来自「PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统」· PGC 代码 · 共 82 行

EXEC SQL WHENEVER SQLERROR SQLPRINT;

int
main(void)
{
	EXEC SQL BEGIN DECLARE SECTION;
	char *stmt1 = "INSERT INTO test1 VALUES (?, ?)";
	char *stmt2 = "SELECT * from test1 where a = ? and b = ?";
	char *stmt3 = "SELECT * from test1 where a = ?";

	int val1 = 1;
	char val2[] = "one", val2output[] = "AAA";
	int val1output = 2, val2i = 0;
	int val2null = -1;
	EXEC SQL END DECLARE SECTION;
	FILE *dbgs;

        if ((dbgs = fopen("log", "w")) != NULL)
                ECPGdebug(1, dbgs);

	EXEC SQL ALLOCATE DESCRIPTOR indesc;
	EXEC SQL ALLOCATE DESCRIPTOR outdesc;

	EXEC SQL SET DESCRIPTOR indesc VALUE 1 DATA = :val1;
	EXEC SQL SET DESCRIPTOR indesc VALUE 2 INDICATOR = :val2i, DATA = :val2;

	EXEC SQL CONNECT TO mm;

	EXEC SQL CREATE TABLE test1 (a int, b text);
	EXEC SQL PREPARE foo1 FROM :stmt1;
	EXEC SQL PREPARE foo2 FROM :stmt2;
	EXEC SQL PREPARE foo3 FROM :stmt3;

	EXEC SQL EXECUTE foo1 USING DESCRIPTOR indesc;

	EXEC SQL SET DESCRIPTOR indesc VALUE 1 DATA = 2;
	EXEC SQL SET DESCRIPTOR indesc VALUE 2 INDICATOR = :val2null, DATA = :val2;
	
	EXEC SQL EXECUTE foo1 USING DESCRIPTOR indesc;

	EXEC SQL SET DESCRIPTOR indesc VALUE 1 DATA = :val1;
	EXEC SQL SET DESCRIPTOR indesc VALUE 2 INDICATOR = :val2i, DATA = :val2;

	EXEC SQL EXECUTE foo2 USING DESCRIPTOR indesc INTO DESCRIPTOR outdesc;
	
	EXEC SQL GET DESCRIPTOR outdesc VALUE 1 :val2output = DATA;
	printf("output = %s\n", val2output);
	
	EXEC SQL DECLARE c1 CURSOR FOR foo2;
	EXEC SQL OPEN c1 USING DESCRIPTOR indesc;

	EXEC SQL FETCH next FROM c1 INTO :val1output, :val2output;
	printf("val1=%d val2=%s\n", val1output, val2output);

	EXEC SQL CLOSE c1;

	EXEC SQL SET DESCRIPTOR indesc COUNT = 1;
	EXEC SQL SET DESCRIPTOR indesc VALUE 1 DATA = 2;
	
	EXEC SQL DECLARE c2 CURSOR FOR foo3;
	EXEC SQL OPEN c2 USING DESCRIPTOR indesc;

	EXEC SQL FETCH next FROM c2 INTO :val1output, :val2output :val2i;
	printf("val1=%d val2=%s\n", val1output, val2i ? "null" : val2output);

	EXEC SQL CLOSE c2;
	
	EXEC SQL SELECT * INTO :val1output, :val2output :val2i FROM test1 where a = 2;
	printf("val1=%d val2=%s\n", val1output, val2i ? "null" : val2output);
	
	EXEC SQL DROP TABLE test1;
	EXEC SQL DISCONNECT;

	EXEC SQL DEALLOCATE DESCRIPTOR indesc;
	EXEC SQL DEALLOCATE DESCRIPTOR outdesc;

	if (dbgs != NULL)
		fclose(dbgs);
			
	return 0;
}