gorm/callback_query.go

121 lines
2.7 KiB
Go

package gorm
import (
"errors"
"fmt"
"reflect"
)
func Query(scope *Scope) {
defer scope.trace(NowFunc())
var (
isSlice bool
isPtr bool
anyRecordFound bool
destType reflect.Type
)
if orderBy, ok := scope.Get("gorm:order_by_primary_key"); ok {
if primaryKey := scope.PrimaryKey(); primaryKey != "" {
scope.Search.Order(fmt.Sprintf("%v.%v %v", scope.QuotedTableName(), scope.Quote(primaryKey), orderBy))
}
}
var dest = scope.IndirectValue()
if value, ok := scope.Get("gorm:query_destination"); ok {
dest = reflect.Indirect(reflect.ValueOf(value))
}
if kind := dest.Kind(); kind == reflect.Slice {
isSlice = true
destType = dest.Type().Elem()
dest.Set(reflect.MakeSlice(dest.Type(), 0, 0))
if destType.Kind() == reflect.Ptr {
isPtr = true
destType = destType.Elem()
}
} else if kind != reflect.Struct {
scope.Err(errors.New("unsupported destination, should be slice or struct"))
return
}
scope.prepareQuerySql()
if !scope.HasError() {
rows, err := scope.SqlDB().Query(scope.Sql, scope.SqlVars...)
scope.db.RowsAffected = 0
if scope.Err(err) != nil {
return
}
defer rows.Close()
columns, _ := rows.Columns()
for rows.Next() {
scope.db.RowsAffected++
anyRecordFound = true
elem := dest
if isSlice {
elem = reflect.New(destType).Elem()
}
var values = make([]interface{}, len(columns))
fields := scope.New(elem.Addr().Interface()).Fields()
for index, column := range columns {
if field, ok := fields[column]; ok {
if field.Field.Kind() == reflect.Ptr {
values[index] = field.Field.Addr().Interface()
} else {
reflectValue := reflect.New(reflect.PtrTo(field.Struct.Type))
reflectValue.Elem().Set(field.Field.Addr())
values[index] = reflectValue.Interface()
}
} else {
var value interface{}
values[index] = &value
}
}
scope.Err(rows.Scan(values...))
for index, column := range columns {
value := values[index]
if field, ok := fields[column]; ok {
if field.Field.Kind() == reflect.Ptr {
field.Field.Set(reflect.ValueOf(value).Elem())
} else if v := reflect.ValueOf(value).Elem().Elem(); v.IsValid() {
field.Field.Set(v)
}
}
}
if isSlice {
if isPtr {
dest.Set(reflect.Append(dest, elem.Addr()))
} else {
dest.Set(reflect.Append(dest, elem))
}
}
}
if !anyRecordFound && !isSlice {
scope.Err(RecordNotFound)
}
}
}
func AfterQuery(scope *Scope) {
scope.CallMethodWithErrorCheck("AfterFind")
}
func init() {
DefaultCallback.Query().Register("gorm:query", Query)
DefaultCallback.Query().Register("gorm:after_query", AfterQuery)
DefaultCallback.Query().Register("gorm:preload", Preload)
}