Add SQLiteRows.DeclTypes() method

sqlite3.go

@@ -893,6 +893,17 @@ func (rc *SQLiteRows) Columns() []string {
 	return rc.cols
 }
 
+// Return column types.
+func (rc *SQLiteRows) DeclTypes() []string {
+	if rc.decltype == nil {
+		rc.decltype = make([]string, rc.nc)
+		for i := 0; i < rc.nc; i++ {
+			rc.decltype[i] = strings.ToLower(C.GoString(C.sqlite3_column_decltype(rc.s.s, C.int(i))))
+		}
+	}
+	return rc.decltype
+}
+
 // Move cursor to next.
 func (rc *SQLiteRows) Next(dest []driver.Value) error {
 	rv := C.sqlite3_step(rc.s.s)
@@ -907,12 +918,7 @@ func (rc *SQLiteRows) Next(dest []driver.Value) error {
 		return nil
 	}
 
-	if rc.decltype == nil {
-		rc.decltype = make([]string, rc.nc)
-		for i := 0; i < rc.nc; i++ {
-			rc.decltype[i] = strings.ToLower(C.GoString(C.sqlite3_column_decltype(rc.s.s, C.int(i))))
-		}
-	}
+	rc.DeclTypes()
 
 	for i := range dest {
 		switch C.sqlite3_column_type(rc.s.s, C.int(i)) {

sqlite3_test.go

@@ -1279,6 +1279,41 @@ func TestAggregatorRegistration(t *testing.T) {
 	}
 }
 
+func TestDeclTypes(t *testing.T) {
+
+	d := SQLiteDriver{}
+
+	conn, err := d.Open(":memory:")
+	if err != nil {
+		t.Fatal("Failed to begin transaction:", err)
+	}
+	defer conn.Close()
+
+	sqlite3conn := conn.(*SQLiteConn)
+
+	_, err = sqlite3conn.Exec("create table foo (id integer not null primary key, name text)", nil)
+	if err != nil {
+		t.Fatal("Failed to create table:", err)
+	}
+
+	_, err = sqlite3conn.Exec("insert into foo(name) values(\"bar\")", nil)
+	if err != nil {
+		t.Fatal("Failed to insert:", err)
+	}
+
+	rs, err := sqlite3conn.Query("select * from foo", nil)
+	if err != nil {
+		t.Fatal("Failed to select:", err)
+	}
+	defer rs.Close()
+
+	declTypes := rs.(*SQLiteRows).DeclTypes()
+
+	if !reflect.DeepEqual(declTypes, []string{"integer", "text"}) {
+		t.Fatal("Unexpected declTypes:", declTypes)
+	}
+}
+
 var customFunctionOnce sync.Once
 
 func BenchmarkCustomFunctions(b *testing.B) {