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