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database/sql: add NullInt64, NullFloat64, NullBool

Fixes #2699

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5557063
This commit is contained in:
James P. Cooper 2012-01-25 17:47:32 -08:00 committed by Brad Fitzpatrick
parent 75e9d24213
commit c21b343438
3 changed files with 185 additions and 41 deletions

View File

@ -585,12 +585,26 @@ func converterForType(typ string) driver.ValueConverter {
switch typ {
case "bool":
return driver.Bool
case "nullbool":
return driver.Null{driver.Bool}
case "int32":
return driver.Int32
case "string":
return driver.NotNull{driver.String}
case "nullstring":
return driver.Null{driver.String}
case "int64":
// TODO(coopernurse): add type-specific converter
return driver.NotNull{driver.DefaultParameterConverter}
case "nullint64":
// TODO(coopernurse): add type-specific converter
return driver.Null{driver.DefaultParameterConverter}
case "float64":
// TODO(coopernurse): add type-specific converter
return driver.NotNull{driver.DefaultParameterConverter}
case "nullfloat64":
// TODO(coopernurse): add type-specific converter
return driver.Null{driver.DefaultParameterConverter}
case "datetime":
return driver.DefaultParameterConverter
}

View File

@ -47,7 +47,6 @@ type RawBytes []byte
// // NULL value
// }
//
// TODO(bradfitz): add other types.
type NullString struct {
String string
Valid bool // Valid is true if String is not NULL
@ -71,6 +70,84 @@ func (ns NullString) SubsetValue() (interface{}, error) {
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.

View File

@ -5,6 +5,7 @@
package sql
import (
"fmt"
"reflect"
"strings"
"testing"
@ -341,16 +342,96 @@ func TestQueryRowClosingStmt(t *testing.T) {
}
}
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})
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)
_, err := db.Exec("INSERT|t|id=?,name=?,favcolor=?", 999, nil, nil)
// Inserts with a prepared statement:
stmt, err := db.Prepare("INSERT|t|id=?,name=?,nullf=?,notnullf=?")
if err != nil {
t.Fatalf("prepare: %v", err)
}
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", spec.rows[3].nullParam, spec.rows[3].notNullParam); 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 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")
}
_, 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,
@ -360,45 +441,17 @@ func TestNullStringParam(t *testing.T) {
// t.Errorf("expected error inserting nil name with Exec")
}
// Inserts with a prepared statement:
stmt, err := db.Prepare("INSERT|t|id=?,name=?,favcolor=?")
if err != nil {
t.Fatalf("prepare: %v", err)
}
if _, err := stmt.Exec(3, "chris", "chartreuse"); err != nil {
t.Errorf("exec insert chris: %v", err)
}
if _, err := stmt.Exec(4, "dave", NullString{"darkred", true}); 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)
}
paramtype := reflect.TypeOf(spec.rows[0].nullParam)
bindVal := reflect.New(paramtype).Interface()
// 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")
}
type nameColor struct {
name string
favColor NullString
}
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 {
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)
}
}
}