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Query with smaller struct

This commit is contained in:
Jinzhu 2020-07-01 08:56:21 +08:00
parent 7aaac3a580
commit 9d7df71332
3 changed files with 50 additions and 9 deletions
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12
callbacks/query.go
View File

@ -40,7 +40,7 @@ func BuildQuerySQL(db *gorm.DB) {
db.Statement.SQL.Grow(100)
clauseSelect := clause.Select{Distinct: db.Statement.Distinct}
if db.Statement.ReflectValue.Kind() == reflect.Struct {
if db.Statement.ReflectValue.Kind() == reflect.Struct && db.Statement.ReflectValue.Type() == db.Statement.Schema.ModelType {
var conds []clause.Expression
for _, primaryField := range db.Statement.Schema.PrimaryFields {
if v, isZero := primaryField.ValueOf(db.Statement.ReflectValue); !isZero {
@ -64,6 +64,16 @@ func BuildQuerySQL(db *gorm.DB) {
clauseSelect.Columns[idx] = clause.Column{Name: name, Raw: true}
}
}
} else if db.Statement.Schema != nil && db.Statement.ReflectValue.IsValid() && db.Statement.ReflectValue.Type() != db.Statement.Schema.ModelType {
stmt := gorm.Statement{DB: db}
// smaller struct
if err := stmt.Parse(db.Statement.Dest); err == nil {
clauseSelect.Columns = make([]clause.Column, len(stmt.Schema.DBNames))
for idx, dbName := range stmt.Schema.DBNames {
clauseSelect.Columns[idx] = clause.Column{Name: dbName}
}
}
}
// inline joins

24
scan.go
View File

@ -69,6 +69,8 @@ func Scan(rows *sql.Rows, db *DB, initialized bool) {
db.AddError(rows.Scan(dest))
}
default:
Schema := db.Statement.Schema
switch db.Statement.ReflectValue.Kind() {
case reflect.Slice, reflect.Array:
var (
@ -84,16 +86,20 @@ func Scan(rows *sql.Rows, db *DB, initialized bool) {
db.Statement.ReflectValue.Set(reflect.MakeSlice(db.Statement.ReflectValue.Type(), 0, 0))
if db.Statement.Schema != nil {
if Schema != nil {
if reflectValueType != Schema.ModelType && reflectValueType.Kind() == reflect.Struct {
Schema, _ = schema.Parse(db.Statement.Dest, db.cacheStore, db.NamingStrategy)
}
for idx, column := range columns {
if field := db.Statement.Schema.LookUpField(column); field != nil && field.Readable {
if field := Schema.LookUpField(column); field != nil && field.Readable {
fields[idx] = field
} else if names := strings.Split(column, "__"); len(names) > 1 {
if len(joinFields) == 0 {
joinFields = make([][2]*schema.Field, len(columns))
}
if rel, ok := db.Statement.Schema.Relationships.Relations[names[0]]; ok {
if rel, ok := Schema.Relationships.Relations[names[0]]; ok {
if field := rel.FieldSchema.LookUpField(strings.Join(names[1:], "__")); field != nil && field.Readable {
fields[idx] = field
joinFields[idx] = [2]*schema.Field{rel.Field, field}
@ -151,12 +157,16 @@ func Scan(rows *sql.Rows, db *DB, initialized bool) {
}
}
case reflect.Struct:
if db.Statement.ReflectValue.Type() != Schema.ModelType {
Schema, _ = schema.Parse(db.Statement.Dest, db.cacheStore, db.NamingStrategy)
}
if initialized || rows.Next() {
for idx, column := range columns {
if field := db.Statement.Schema.LookUpField(column); field != nil && field.Readable {
if field := Schema.LookUpField(column); field != nil && field.Readable {
values[idx] = reflect.New(reflect.PtrTo(field.IndirectFieldType)).Interface()
} else if names := strings.Split(column, "__"); len(names) > 1 {
if rel, ok := db.Statement.Schema.Relationships.Relations[names[0]]; ok {
if rel, ok := Schema.Relationships.Relations[names[0]]; ok {
if field := rel.FieldSchema.LookUpField(strings.Join(names[1:], "__")); field != nil && field.Readable {
values[idx] = reflect.New(reflect.PtrTo(field.IndirectFieldType)).Interface()
continue
@ -172,10 +182,10 @@ func Scan(rows *sql.Rows, db *DB, initialized bool) {
db.AddError(rows.Scan(values...))
for idx, column := range columns {
if field := db.Statement.Schema.LookUpField(column); field != nil && field.Readable {
if field := Schema.LookUpField(column); field != nil && field.Readable {
field.Set(db.Statement.ReflectValue, values[idx])
} else if names := strings.Split(column, "__"); len(names) > 1 {
if rel, ok := db.Statement.Schema.Relationships.Relations[names[0]]; ok {
if rel, ok := Schema.Relationships.Relations[names[0]]; ok {
relValue := rel.Field.ReflectValueOf(db.Statement.ReflectValue)
if field := rel.FieldSchema.LookUpField(strings.Join(names[1:], "__")); field != nil && field.Readable {
value := reflect.ValueOf(values[idx]).Elem()

23
tests/query_test.go
View File

@ -3,6 +3,7 @@ package tests_test
import (
"fmt"
"reflect"
"regexp"
"sort"
"strconv"
"testing"
@ -144,8 +145,8 @@ func TestFillSmallerStruct(t *testing.T) {
user := User{Name: "SmallerUser", Age: 100}
DB.Save(&user)
type SimpleUser struct {
Name string
ID int64
Name string
UpdatedAt time.Time
CreatedAt time.Time
}
@ -156,6 +157,26 @@ func TestFillSmallerStruct(t *testing.T) {
}
AssertObjEqual(t, user, simpleUser, "Name", "ID", "UpdatedAt", "CreatedAt")
var simpleUser2 SimpleUser
if err := DB.Model(&User{}).Select("id").First(&simpleUser2, user.ID).Error; err != nil {
t.Fatalf("Failed to query smaller user, got error %v", err)
}
AssertObjEqual(t, user, simpleUser2, "ID")
var simpleUsers []SimpleUser
if err := DB.Model(&User{}).Select("id").Find(&simpleUsers, user.ID).Error; err != nil || len(simpleUsers) != 1 {
t.Fatalf("Failed to query smaller user, got error %v", err)
}
AssertObjEqual(t, user, simpleUsers[0], "ID")
result := DB.Session(&gorm.Session{DryRun: true}).Model(&User{}).Find(&simpleUsers, user.ID)
if !regexp.MustCompile("SELECT .*id.*name.*updated_at.*created_at.* FROM .*users").MatchString(result.Statement.SQL.String()) {
t.Fatalf("SQL should include selected names, but got %v", result.Statement.SQL.String())
}
}
func TestPluck(t *testing.T) {