// // NULL value
// }
//
-// TODO(bradfitz): add other types.
type NullString struct {
String string
Valid bool // Valid is true if String is not NULL
return ns.String, nil
}
+// NullInt64 represents an int64 that may be null.
+// NullInt64 implements the ScannerInto interface so
+// it can be used as a scan destination, similar to NullString.
+type NullInt64 struct {
+ Int64 int64
+ Valid bool // Valid is true if Int64 is not NULL
+}
+
+// ScanInto implements the ScannerInto interface.
+func (n *NullInt64) ScanInto(value interface{}) error {
+ if value == nil {
+ n.Int64, n.Valid = 0, false
+ return nil
+ }
+ n.Valid = true
+ return convertAssign(&n.Int64, value)
+}
+
+// SubsetValue implements the driver SubsetValuer interface.
+func (n NullInt64) SubsetValue() (interface{}, error) {
+ if !n.Valid {
+ return nil, nil
+ }
+ return n.Int64, nil
+}
+
+// NullFloat64 represents a float64 that may be null.
+// NullFloat64 implements the ScannerInto interface so
+// it can be used as a scan destination, similar to NullString.
+type NullFloat64 struct {
+ Float64 float64
+ Valid bool // Valid is true if Float64 is not NULL
+}
+
+// ScanInto implements the ScannerInto interface.
+func (n *NullFloat64) ScanInto(value interface{}) error {
+ if value == nil {
+ n.Float64, n.Valid = 0, false
+ return nil
+ }
+ n.Valid = true
+ return convertAssign(&n.Float64, value)
+}
+
+// SubsetValue implements the driver SubsetValuer interface.
+func (n NullFloat64) SubsetValue() (interface{}, error) {
+ if !n.Valid {
+ return nil, nil
+ }
+ return n.Float64, nil
+}
+
+// NullBool represents a bool that may be null.
+// NullBool implements the ScannerInto interface so
+// it can be used as a scan destination, similar to NullString.
+type NullBool struct {
+ Bool bool
+ Valid bool // Valid is true if Bool is not NULL
+}
+
+// ScanInto implements the ScannerInto interface.
+func (n *NullBool) ScanInto(value interface{}) error {
+ if value == nil {
+ n.Bool, n.Valid = false, false
+ return nil
+ }
+ n.Valid = true
+ return convertAssign(&n.Bool, value)
+}
+
+// SubsetValue implements the driver SubsetValuer interface.
+func (n NullBool) SubsetValue() (interface{}, error) {
+ if !n.Valid {
+ return nil, nil
+ }
+ return n.Bool, nil
+}
+
// ScannerInto is an interface used by Scan.
type ScannerInto interface {
// ScanInto assigns a value from a database driver.
package sql
import (
+ "fmt"
"reflect"
"strings"
"testing"
}
}
+type nullTestRow struct {
+ nullParam interface{}
+ notNullParam interface{}
+ scanNullVal interface{}
+}
+
+type nullTestSpec struct {
+ nullType string
+ notNullType string
+ rows [6]nullTestRow
+}
+
func TestNullStringParam(t *testing.T) {
+ spec := nullTestSpec{"nullstring", "string", [6]nullTestRow{
+ nullTestRow{NullString{"aqua", true}, "", NullString{"aqua", true}},
+ nullTestRow{NullString{"brown", false}, "", NullString{"", false}},
+ nullTestRow{"chartreuse", "", NullString{"chartreuse", true}},
+ nullTestRow{NullString{"darkred", true}, "", NullString{"darkred", true}},
+ nullTestRow{NullString{"eel", false}, "", NullString{"", false}},
+ nullTestRow{"foo", NullString{"black", false}, nil},
+ }}
+ nullTestRun(t, spec)
+}
+
+func TestNullInt64Param(t *testing.T) {
+ spec := nullTestSpec{"nullint64", "int64", [6]nullTestRow{
+ nullTestRow{NullInt64{31, true}, 1, NullInt64{31, true}},
+ nullTestRow{NullInt64{-22, false}, 1, NullInt64{0, false}},
+ nullTestRow{22, 1, NullInt64{22, true}},
+ nullTestRow{NullInt64{33, true}, 1, NullInt64{33, true}},
+ nullTestRow{NullInt64{222, false}, 1, NullInt64{0, false}},
+ nullTestRow{0, NullInt64{31, false}, nil},
+ }}
+ nullTestRun(t, spec)
+}
+
+func TestNullFloat64Param(t *testing.T) {
+ spec := nullTestSpec{"nullfloat64", "float64", [6]nullTestRow{
+ nullTestRow{NullFloat64{31.2, true}, 1, NullFloat64{31.2, true}},
+ nullTestRow{NullFloat64{13.1, false}, 1, NullFloat64{0, false}},
+ nullTestRow{-22.9, 1, NullFloat64{-22.9, true}},
+ nullTestRow{NullFloat64{33.81, true}, 1, NullFloat64{33.81, true}},
+ nullTestRow{NullFloat64{222, false}, 1, NullFloat64{0, false}},
+ nullTestRow{10, NullFloat64{31.2, false}, nil},
+ }}
+ nullTestRun(t, spec)
+}
+
+func TestNullBoolParam(t *testing.T) {
+ spec := nullTestSpec{"nullbool", "bool", [6]nullTestRow{
+ nullTestRow{NullBool{false, true}, true, NullBool{false, true}},
+ nullTestRow{NullBool{true, false}, false, NullBool{false, false}},
+ nullTestRow{true, true, NullBool{true, true}},
+ nullTestRow{NullBool{true, true}, false, NullBool{true, true}},
+ nullTestRow{NullBool{true, false}, true, NullBool{false, false}},
+ nullTestRow{true, NullBool{true, false}, nil},
+ }}
+ nullTestRun(t, spec)
+}
+
+func nullTestRun(t *testing.T, spec nullTestSpec) {
db := newTestDB(t, "")
defer closeDB(t, db)
- exec(t, db, "CREATE|t|id=int32,name=string,favcolor=nullstring")
+ exec(t, db, fmt.Sprintf("CREATE|t|id=int32,name=string,nullf=%s,notnullf=%s", spec.nullType, spec.notNullType))
// Inserts with db.Exec:
- exec(t, db, "INSERT|t|id=?,name=?,favcolor=?", 1, "alice", NullString{"aqua", true})
- exec(t, db, "INSERT|t|id=?,name=?,favcolor=?", 2, "bob", NullString{"brown", false})
-
- _, err := db.Exec("INSERT|t|id=?,name=?,favcolor=?", 999, nil, nil)
- if err == nil {
- // TODO: this test fails, but it's just because
- // fakeConn implements the optional Execer interface,
- // so arguably this is the correct behavior. But
- // maybe I should flesh out the fakeConn.Exec
- // implementation so this properly fails.
- // t.Errorf("expected error inserting nil name with Exec")
- }
+ exec(t, db, "INSERT|t|id=?,name=?,nullf=?,notnullf=?", 1, "alice", spec.rows[0].nullParam, spec.rows[0].notNullParam)
+ exec(t, db, "INSERT|t|id=?,name=?,nullf=?,notnullf=?", 2, "bob", spec.rows[1].nullParam, spec.rows[1].notNullParam)
// Inserts with a prepared statement:
- stmt, err := db.Prepare("INSERT|t|id=?,name=?,favcolor=?")
+ stmt, err := db.Prepare("INSERT|t|id=?,name=?,nullf=?,notnullf=?")
if err != nil {
t.Fatalf("prepare: %v", err)
}
- if _, err := stmt.Exec(3, "chris", "chartreuse"); err != nil {
+ if _, err := stmt.Exec(3, "chris", spec.rows[2].nullParam, spec.rows[2].notNullParam); err != nil {
t.Errorf("exec insert chris: %v", err)
}
- if _, err := stmt.Exec(4, "dave", NullString{"darkred", true}); err != nil {
+ if _, err := stmt.Exec(4, "dave", spec.rows[3].nullParam, spec.rows[3].notNullParam); err != nil {
t.Errorf("exec insert dave: %v", err)
}
- if _, err := stmt.Exec(5, "eleanor", NullString{"eel", false}); err != nil {
- t.Errorf("exec insert dave: %v", err)
+ if _, err := stmt.Exec(5, "eleanor", spec.rows[4].nullParam, spec.rows[4].notNullParam); err != nil {
+ t.Errorf("exec insert eleanor: %v", err)
}
- // Can't put null name into non-nullstring column,
- if _, err := stmt.Exec(5, NullString{"", false}, nil); err == nil {
- t.Errorf("expected error inserting nil name with prepared statement Exec")
+ // Can't put null val into non-null col
+ if _, err := stmt.Exec(6, "bob", spec.rows[5].nullParam, spec.rows[5].notNullParam); err == nil {
+ t.Errorf("expected error inserting nil val with prepared statement Exec")
}
- type nameColor struct {
- name string
- favColor NullString
+ _, err = db.Exec("INSERT|t|id=?,name=?,nullf=?", 999, nil, nil)
+ if err == nil {
+ // TODO: this test fails, but it's just because
+ // fakeConn implements the optional Execer interface,
+ // so arguably this is the correct behavior. But
+ // maybe I should flesh out the fakeConn.Exec
+ // implementation so this properly fails.
+ // t.Errorf("expected error inserting nil name with Exec")
}
- wantMap := map[int]nameColor{
- 1: nameColor{"alice", NullString{"aqua", true}},
- 2: nameColor{"bob", NullString{"", false}},
- 3: nameColor{"chris", NullString{"chartreuse", true}},
- 4: nameColor{"dave", NullString{"darkred", true}},
- 5: nameColor{"eleanor", NullString{"", false}},
- }
- for id, want := range wantMap {
- var got nameColor
- if err := db.QueryRow("SELECT|t|name,favcolor|id=?", id).Scan(&got.name, &got.favColor); err != nil {
+ paramtype := reflect.TypeOf(spec.rows[0].nullParam)
+ bindVal := reflect.New(paramtype).Interface()
+
+ for i := 0; i < 5; i++ {
+ id := i + 1
+ if err := db.QueryRow("SELECT|t|nullf|id=?", id).Scan(bindVal); err != nil {
t.Errorf("id=%d Scan: %v", id, err)
}
- if got != want {
- t.Errorf("id=%d got %#v, want %#v", id, got, want)
+ bindValDeref := reflect.ValueOf(bindVal).Elem().Interface()
+ if !reflect.DeepEqual(bindValDeref, spec.rows[i].scanNullVal) {
+ t.Errorf("id=%d got %#v, want %#v", id, bindValDeref, spec.rows[i].scanNullVal)
}
}
}