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scan_test.go
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scan_test.go
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package tests_test
import (
"reflect"
"sort"
"strings"
"testing"
"gorm.io/gorm"
. "gorm.io/gorm/utils/tests"
)
type PersonAddressInfo struct {
Person *Person `gorm:"embedded"`
Address *Address `gorm:"embedded"`
}
func TestScan(t *testing.T) {
user1 := User{Name: "ScanUser1", Age: 1}
user2 := User{Name: "ScanUser2", Age: 10}
user3 := User{Name: "ScanUser3", Age: 20}
DB.Save(&user1).Save(&user2).Save(&user3)
type result struct {
ID uint
Name string
Age int
}
var res result
DB.Table("users").Select("id, name, age").Where("id = ?", user3.ID).Scan(&res)
if res.ID != user3.ID || res.Name != user3.Name || res.Age != int(user3.Age) {
t.Fatalf("Scan into struct should work, got %#v, should %#v", res, user3)
}
var resPointer *result
if err := DB.Table("users").Select("id, name, age").Where("id = ?", user3.ID).Scan(&resPointer).Error; err != nil {
t.Fatalf("Failed to query with pointer of value, got error %v", err)
} else if resPointer.ID != user3.ID || resPointer.Name != user3.Name || resPointer.Age != int(user3.Age) {
t.Fatalf("Scan into struct should work, got %#v, should %#v", res, user3)
}
DB.Table("users").Select("id, name, age").Where("id = ?", user2.ID).Scan(&res)
if res.ID != user2.ID || res.Name != user2.Name || res.Age != int(user2.Age) {
t.Fatalf("Scan into struct should work, got %#v, should %#v", res, user2)
}
DB.Model(&User{Model: gorm.Model{ID: user3.ID}}).Select("id, name, age").Scan(&res)
if res.ID != user3.ID || res.Name != user3.Name || res.Age != int(user3.Age) {
t.Fatalf("Scan into struct should work, got %#v, should %#v", res, user3)
}
doubleAgeRes := &result{}
if err := DB.Table("users").Select("age + age as age").Where("id = ?", user3.ID).Scan(&doubleAgeRes).Error; err != nil {
t.Errorf("Scan to pointer of pointer")
}
if doubleAgeRes.Age != int(res.Age)*2 {
t.Errorf("Scan double age as age, expect: %v, got %v", res.Age*2, doubleAgeRes.Age)
}
var results []result
DB.Table("users").Select("name, age").Where("id in ?", []uint{user2.ID, user3.ID}).Scan(&results)
sort.Slice(results, func(i, j int) bool {
return strings.Compare(results[i].Name, results[j].Name) <= -1
})
if len(results) != 2 || results[0].Name != user2.Name || results[1].Name != user3.Name {
t.Errorf("Scan into struct map, got %#v", results)
}
type ID uint64
var id ID
DB.Raw("select id from users where id = ?", user2.ID).Scan(&id)
if uint(id) != user2.ID {
t.Errorf("Failed to scan to customized data type")
}
var resInt interface{}
resInt = &User{}
if err := DB.Table("users").Select("id, name, age").Where("id = ?", user3.ID).Find(&resInt).Error; err != nil {
t.Fatalf("Failed to query with pointer of value, got error %v", err)
} else if resInt.(*User).ID != user3.ID || resInt.(*User).Name != user3.Name || resInt.(*User).Age != user3.Age {
t.Fatalf("Scan into struct should work, got %#v, should %#v", resInt, user3)
}
var resInt2 interface{}
resInt2 = &User{}
if err := DB.Table("users").Select("id, name, age").Where("id = ?", user3.ID).Scan(&resInt2).Error; err != nil {
t.Fatalf("Failed to query with pointer of value, got error %v", err)
} else if resInt2.(*User).ID != user3.ID || resInt2.(*User).Name != user3.Name || resInt2.(*User).Age != user3.Age {
t.Fatalf("Scan into struct should work, got %#v, should %#v", resInt2, user3)
}
var resInt3 interface{}
resInt3 = []User{}
if err := DB.Table("users").Select("id, name, age").Where("id = ?", user3.ID).Find(&resInt3).Error; err != nil {
t.Fatalf("Failed to query with pointer of value, got error %v", err)
} else if rus := resInt3.([]User); len(rus) == 0 || rus[0].ID != user3.ID || rus[0].Name != user3.Name || rus[0].Age != user3.Age {
t.Fatalf("Scan into struct should work, got %#v, should %#v", resInt3, user3)
}
var resInt4 interface{}
resInt4 = []User{}
if err := DB.Table("users").Select("id, name, age").Where("id = ?", user3.ID).Scan(&resInt4).Error; err != nil {
t.Fatalf("Failed to query with pointer of value, got error %v", err)
} else if rus := resInt4.([]User); len(rus) == 0 || rus[0].ID != user3.ID || rus[0].Name != user3.Name || rus[0].Age != user3.Age {
t.Fatalf("Scan into struct should work, got %#v, should %#v", resInt4, user3)
}
var resInt5 interface{}
resInt5 = []User{}
if err := DB.Table("users").Select("id, name, age").Where("id IN ?", []uint{user1.ID, user2.ID, user3.ID}).Find(&resInt5).Error; err != nil {
t.Fatalf("Failed to query with pointer of value, got error %v", err)
} else if rus := resInt5.([]User); len(rus) != 3 {
t.Fatalf("Scan into struct should work, got %+v, len %v", resInt5, len(rus))
}
}
func TestScanRows(t *testing.T) {
user1 := User{Name: "ScanRowsUser1", Age: 1}
user2 := User{Name: "ScanRowsUser2", Age: 10}
user3 := User{Name: "ScanRowsUser3", Age: 20}
DB.Save(&user1).Save(&user2).Save(&user3)
rows, err := DB.Table("users").Where("name = ? or name = ?", user2.Name, user3.Name).Select("name, age").Rows()
if err != nil {
t.Errorf("Not error should happen, got %v", err)
}
type Result struct {
Name string
Age int
}
var results []Result
for rows.Next() {
var result Result
if err := DB.ScanRows(rows, &result); err != nil {
t.Errorf("should get no error, but got %v", err)
}
results = append(results, result)
}
sort.Slice(results, func(i, j int) bool {
return strings.Compare(results[i].Name, results[j].Name) <= -1
})
if !reflect.DeepEqual(results, []Result{{Name: "ScanRowsUser2", Age: 10}, {Name: "ScanRowsUser3", Age: 20}}) {
t.Errorf("Should find expected results")
}
var ages int
if err := DB.Table("users").Where("name = ? or name = ?", user2.Name, user3.Name).Select("SUM(age)").Scan(&ages).Error; err != nil || ages != 30 {
t.Fatalf("failed to scan ages, got error %v, ages: %v", err, ages)
}
var name string
if err := DB.Table("users").Where("name = ?", user2.Name).Select("name").Scan(&name).Error; err != nil || name != user2.Name {
t.Fatalf("failed to scan ages, got error %v, ages: %v", err, name)
}
}
func TestScanToEmbedded(t *testing.T) {
person1 := Person{Name: "person 1"}
person2 := Person{Name: "person 2"}
DB.Save(&person1).Save(&person2)
address1 := Address{Name: "address 1"}
address2 := Address{Name: "address 2"}
DB.Save(&address1).Save(&address2)
DB.Create(&PersonAddress{PersonID: person1.ID, AddressID: int(address1.ID)})
DB.Create(&PersonAddress{PersonID: person1.ID, AddressID: int(address2.ID)})
DB.Create(&PersonAddress{PersonID: person2.ID, AddressID: int(address1.ID)})
var personAddressInfoList []*PersonAddressInfo
if err := DB.Select("people.*, addresses.*").
Table("people").
Joins("inner join person_addresses on people.id = person_addresses.person_id").
Joins("inner join addresses on person_addresses.address_id = addresses.id").
Find(&personAddressInfoList).Error; err != nil {
t.Errorf("Failed to run join query, got error: %v", err)
}
personMatched := false
addressMatched := false
for _, info := range personAddressInfoList {
if info.Person == nil {
t.Fatalf("Failed, expected not nil, got person nil")
}
if info.Address == nil {
t.Fatalf("Failed, expected not nil, got address nil")
}
if info.Person.ID == person1.ID {
personMatched = true
if info.Person.Name != person1.Name {
t.Errorf("Failed, expected %v, got %v", person1.Name, info.Person.Name)
}
}
if info.Address.ID == address1.ID {
addressMatched = true
if info.Address.Name != address1.Name {
t.Errorf("Failed, expected %v, got %v", address1.Name, info.Address.Name)
}
}
}
if !personMatched {
t.Errorf("Failed, no person matched")
}
if !addressMatched {
t.Errorf("Failed, no address matched")
}
}