Add support for extracting 2006-01-02 formatted timestamps.

SQLite3 stores timestamps very naively -- they're completely untyped,
and can contain any value. The previous implementation always inserts
values in the 'datetime' format, and returns an error when attempting to
extract a field with a different format.

Some legacy databases, unfortunately, were generated using the 'date'
SQLite3 function, which produces rows in the '2006-01-02' format. This
patch adds a special case so that these rows can be extracted without
error.

sqlite3.go

@@ -27,6 +27,7 @@ import (
 )
 
 const SQLiteTimestampFormat = "2006-01-02 15:04:05"
+const SQLiteDateFormat = "2006-01-02"
 
 func init() {
 	sql.Register("sqlite3", &SQLiteDriver{})
@@ -313,7 +314,10 @@ func (rc *SQLiteRows) Next(dest []driver.Value) error {
 			if rc.decltype[i] == "timestamp" {
 				dest[i], err = time.Parse(SQLiteTimestampFormat, s)
 				if err != nil {
-					return err
+					dest[i], err = time.Parse(SQLiteDateFormat, s)
+					if err != nil {
+						return err
+					}
 				}
 			} else {
 				dest[i] = s

sqlite3_test.go

@@ -400,3 +400,63 @@ func TestBoolean(t *testing.T) {
 		t.Error("Expected error from \"nonsense\" bool")
 	}
 }
+
+func TestDateOnlyTimestamp(t *testing.T) {
+	// make sure that timestamps without times are extractable. these are generated when
+	// e.g., you use the sqlite `DATE()` built-in.
+
+	db, er := sql.Open("sqlite3", "db.sqlite")
+	if er != nil {
+		t.Fatal(er)
+	}
+	defer func() {
+		db.Close()
+		os.Remove("db.sqlite")
+	}()
+
+	_, er = db.Exec(`
+		CREATE TABLE test
+			( entry_id INTEGER PRIMARY KEY AUTOINCREMENT
+			, entry_published TIMESTAMP NOT NULL
+			)
+	`)
+	if er != nil {
+		t.Fatal(er)
+	}
+
+	_, er = db.Exec(`
+		INSERT INTO test VALUES ( 1, '2012-11-04')
+	`)
+	if er != nil {
+		t.Fatal(er)
+	}
+
+	rows, er := db.Query("SELECT entry_id, entry_published FROM test")
+	if er != nil {
+		t.Fatal(er)
+	}
+	defer rows.Close()
+
+	if !rows.Next() {
+		if er := rows.Err() ; er != nil {
+			t.Fatal(er)
+		} else {
+			t.Fatalf("Unable to extract row containing date-only timestamp")
+		}
+	}
+
+	var entryId int64
+	var entryPublished time.Time
+
+	if er := rows.Scan(&entryId, &entryPublished) ; er != nil {
+		t.Fatal(er)
+	}
+
+	if entryId != 1 {
+		t.Errorf("EntryId does not match inserted value")
+	}
+
+	if entryPublished.Year() != 2012 || entryPublished.Month() != 11 || entryPublished.Day() != 4 {
+		t.Errorf("Extracted time does not match inserted value")
+	}
+}