@@ -1770,6 +1770,7 @@ var tests = []testing.InternalTest{
17701770 {Name : "TestResult" , F : testResult },
17711771 {Name : "TestBlobs" , F : testBlobs },
17721772 {Name : "TestMultiBlobs" , F : testMultiBlobs },
1773+ {Name : "TestNullZeroLengthBlobs" , F : testNullZeroLengthBlobs },
17731774 {Name : "TestManyQueryRow" , F : testManyQueryRow },
17741775 {Name : "TestTxQuery" , F : testTxQuery },
17751776 {Name : "TestPreparedStmt" , F : testPreparedStmt },
@@ -1975,6 +1976,36 @@ func testMultiBlobs(t *testing.T) {
19751976 }
19761977}
19771978
1979+ // testBlobs tests that we distinguish between null and zero-length blobs
1980+ func testNullZeroLengthBlobs (t * testing.T ) {
1981+ db .tearDown ()
1982+ db .mustExec ("create table foo (id integer primary key, bar " + db .blobType (16 ) + ")" )
1983+ db .mustExec (db .q ("insert into foo (id, bar) values(?,?)" ), 0 , nil )
1984+ db .mustExec (db .q ("insert into foo (id, bar) values(?,?)" ), 1 , []byte {})
1985+ 1986+ r0 := db .QueryRow (db .q ("select bar from foo where id=0" ))
1987+ var b0 []byte
1988+ err := r0 .Scan (& b0 )
1989+ if err != nil {
1990+ t .Fatal (err )
1991+ }
1992+ if b0 != nil {
1993+ t .Errorf ("for id=0, got %x; want nil" , b0 )
1994+ }
1995+ 1996+ r1 := db .QueryRow (db .q ("select bar from foo where id=1" ))
1997+ var b1 []byte
1998+ err = r1 .Scan (& b1 )
1999+ if err != nil {
2000+ t .Fatal (err )
2001+ }
2002+ if b1 == nil {
2003+ t .Error ("for id=1, got nil; want zero-length slice" )
2004+ } else if len (b1 ) > 0 {
2005+ t .Errorf ("for id=1, got %x; want zero-length slice" , b1 )
2006+ }
2007+ }
2008+ 19782009// testManyQueryRow is test for many query row
19792010func testManyQueryRow (t * testing.T ) {
19802011 if testing .Short () {
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