Simple and Powerful ORM for Go, support mysql,postgres,tidb,sqlite3,sqlite,mssql,oracle,cockroach https://xorm.io
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// Copyright 2021 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package xorm
import (
"database/sql"
"fmt"
"math/big"
"reflect"
"time"
"xorm.io/xorm/core"
"xorm.io/xorm/dialects"
"xorm.io/xorm/internal/convert"
"xorm.io/xorm/schemas"
)
// genScanResultsByBeanNullabale generates scan result
func genScanResultsByBeanNullable(bean interface{}) (interface{}, bool, error) {
switch t := bean.(type) {
case *interface{}:
return t, false, nil
case *sql.NullInt64, *sql.NullBool, *sql.NullFloat64, *sql.NullString, *sql.RawBytes:
return t, false, nil
case *time.Time:
return &sql.NullString{}, true, nil
case *sql.NullTime:
return &sql.NullString{}, true, nil
case *string:
return &sql.NullString{}, true, nil
case *int, *int8, *int16, *int32:
return &sql.NullInt32{}, true, nil
case *int64:
return &sql.NullInt64{}, true, nil
case *uint, *uint8, *uint16, *uint32:
return &convert.NullUint32{}, true, nil
case *uint64:
return &convert.NullUint64{}, true, nil
case *float32, *float64:
return &sql.NullFloat64{}, true, nil
case *bool:
return &sql.NullBool{}, true, nil
case sql.NullInt64, sql.NullBool, sql.NullFloat64, sql.NullString,
time.Time,
string,
int, int8, int16, int32, int64,
uint, uint8, uint16, uint32, uint64,
float32, float64,
bool:
return nil, false, fmt.Errorf("unsupported scan type: %t", t)
case convert.Conversion:
return &sql.RawBytes{}, true, nil
}
tp := reflect.TypeOf(bean).Elem()
switch tp.Kind() {
case reflect.String:
return &sql.NullString{}, true, nil
case reflect.Int64:
return &sql.NullInt64{}, true, nil
case reflect.Int32, reflect.Int, reflect.Int16, reflect.Int8:
return &sql.NullInt32{}, true, nil
case reflect.Uint64:
return &convert.NullUint64{}, true, nil
case reflect.Uint32, reflect.Uint, reflect.Uint16, reflect.Uint8:
return &convert.NullUint32{}, true, nil
default:
return nil, false, fmt.Errorf("unsupported type: %#v", bean)
}
}
func genScanResultsByBean(bean interface{}) (interface{}, bool, error) {
switch t := bean.(type) {
case *interface{}:
return t, false, nil
case *sql.NullInt64, *sql.NullBool, *sql.NullFloat64, *sql.NullString,
*sql.RawBytes,
*string,
*int, *int8, *int16, *int32, *int64,
*uint, *uint8, *uint16, *uint32, *uint64,
*float32, *float64,
*bool:
return t, false, nil
case *time.Time, *sql.NullTime:
return &sql.NullString{}, true, nil
case sql.NullInt64, sql.NullBool, sql.NullFloat64, sql.NullString,
time.Time,
string,
int, int8, int16, int32, int64,
uint, uint8, uint16, uint32, uint64,
bool:
return nil, false, fmt.Errorf("unsupported scan type: %t", t)
case convert.Conversion:
return &sql.RawBytes{}, true, nil
}
tp := reflect.TypeOf(bean).Elem()
switch tp.Kind() {
case reflect.String:
return new(string), true, nil
case reflect.Int64:
return new(int64), true, nil
case reflect.Int32:
return new(int32), true, nil
case reflect.Int:
return new(int32), true, nil
case reflect.Int16:
return new(int32), true, nil
case reflect.Int8:
return new(int32), true, nil
case reflect.Uint64:
return new(uint64), true, nil
case reflect.Uint32:
return new(uint32), true, nil
case reflect.Uint:
return new(uint), true, nil
case reflect.Uint16:
return new(uint16), true, nil
case reflect.Uint8:
return new(uint8), true, nil
case reflect.Float32:
return new(float32), true, nil
case reflect.Float64:
return new(float64), true, nil
default:
return nil, false, fmt.Errorf("unsupported type: %#v", bean)
}
}
func (engine *Engine) row2mapStr(rows *core.Rows, types []*sql.ColumnType, fields []string) (map[string]string, error) {
var scanResults = make([]interface{}, len(fields))
for i := 0; i < len(fields); i++ {
var s sql.NullString
scanResults[i] = &s
}
if err := rows.Scan(scanResults...); err != nil {
return nil, err
}
result := make(map[string]string, len(fields))
for i, key := range fields {
s := scanResults[i].(*sql.NullString)
if s.String == "" {
result[key] = ""
continue
}
if schemas.TIME_TYPE == engine.dialect.ColumnTypeKind(types[i].DatabaseTypeName()) {
t, err := convert.String2Time(s.String, engine.DatabaseTZ, engine.TZLocation)
if err != nil {
return nil, err
}
result[key] = t.Format("2006-01-02 15:04:05")
} else {
result[key] = s.String
}
}
return result, nil
}
func row2mapBytes(rows *core.Rows, types []*sql.ColumnType, fields []string) (map[string][]byte, error) {
var scanResults = make([]interface{}, len(fields))
for i := 0; i < len(fields); i++ {
var s sql.NullString
scanResults[i] = &s
}
if err := rows.Scan(scanResults...); err != nil {
return nil, err
}
result := make(map[string][]byte, len(fields))
for ii, key := range fields {
s := scanResults[ii].(*sql.NullString)
result[key] = []byte(s.String)
}
return result, nil
}
func (engine *Engine) scanStringInterface(rows *core.Rows, fields []string, types []*sql.ColumnType) ([]interface{}, error) {
var scanResults = make([]interface{}, len(types))
for i := 0; i < len(types); i++ {
var s sql.NullString
scanResults[i] = &s
}
if err := engine.scan(rows, fields, types, scanResults...); err != nil {
return nil, err
}
return scanResults, nil
}
// scan is a wrap of driver.Scan but will automatically change the input values according requirements
func (engine *Engine) scan(rows *core.Rows, fields []string, types []*sql.ColumnType, vv ...interface{}) error {
var scanResults = make([]interface{}, 0, len(types))
var replaces = make([]bool, 0, len(types))
var err error
for _, v := range vv {
var replaced bool
var scanResult interface{}
switch t := v.(type) {
case *big.Float, *time.Time, *sql.NullTime:
scanResult = &sql.NullString{}
replaced = true
case sql.Scanner:
scanResult = t
case convert.Conversion:
scanResult = &sql.RawBytes{}
replaced = true
default:
nullable, ok := types[0].Nullable()
if !ok || nullable {
scanResult, replaced, err = genScanResultsByBeanNullable(v)
} else {
scanResult, replaced, err = genScanResultsByBean(v)
}
if err != nil {
return err
}
}
scanResults = append(scanResults, scanResult)
replaces = append(replaces, replaced)
}
if err = engine.driver.Scan(&dialects.ScanContext{
DBLocation: engine.DatabaseTZ,
UserLocation: engine.TZLocation,
}, rows, types, scanResults...); err != nil {
return err
}
for i, replaced := range replaces {
if replaced {
if err = convert.Assign(vv[i], scanResults[i], engine.DatabaseTZ, engine.TZLocation); err != nil {
return err
}
}
}
return nil
}
func (engine *Engine) scanInterfaces(rows *core.Rows, fields []string, types []*sql.ColumnType) ([]interface{}, error) {
var scanResultContainers = make([]interface{}, len(types))
for i := 0; i < len(types); i++ {
scanResult, err := engine.driver.GenScanResult(types[i].DatabaseTypeName())
if err != nil {
return nil, err
}
scanResultContainers[i] = scanResult
}
if err := engine.scan(rows, fields, types, scanResultContainers...); err != nil {
return nil, err
}
return scanResultContainers, nil
}
func (engine *Engine) row2sliceStr(rows *core.Rows, types []*sql.ColumnType, fields []string) ([]string, error) {
scanResults, err := engine.scanStringInterface(rows, fields, types)
if err != nil {
return nil, err
}
var results = make([]string, 0, len(fields))
for i := 0; i < len(fields); i++ {
results = append(results, scanResults[i].(*sql.NullString).String)
}
return results, nil
}
func rows2maps(rows *core.Rows) (resultsSlice []map[string][]byte, err error) {
fields, err := rows.Columns()
if err != nil {
return nil, err
}
types, err := rows.ColumnTypes()
if err != nil {
return nil, err
}
for rows.Next() {
result, err := row2mapBytes(rows, types, fields)
if err != nil {
return nil, err
}
resultsSlice = append(resultsSlice, result)
}
if rows.Err() != nil {
return nil, rows.Err()
}
return resultsSlice, nil
}
func (engine *Engine) row2mapInterface(rows *core.Rows, types []*sql.ColumnType, fields []string) (map[string]interface{}, error) {
var resultsMap = make(map[string]interface{}, len(fields))
var scanResultContainers = make([]interface{}, len(fields))
for i := 0; i < len(fields); i++ {
scanResult, err := engine.driver.GenScanResult(types[i].DatabaseTypeName())
if err != nil {
return nil, err
}
scanResultContainers[i] = scanResult
}
if err := engine.scan(rows, fields, types, scanResultContainers...); err != nil {
return nil, err
}
for ii, key := range fields {
res, err := convert.Interface2Interface(engine.TZLocation, scanResultContainers[ii])
if err != nil {
return nil, err
}
resultsMap[key] = res
}
return resultsMap, nil
}