69 lines
1.5 KiB
Go
69 lines
1.5 KiB
Go
/*
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Copyright 2021 Alibaba Group Holding Limited.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package database
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import (
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"database/sql"
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"errors"
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"strings"
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)
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type ScanOpt struct {
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CaseInsensitive bool
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}
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func Scan(rows *sql.Rows, dest map[string]interface{}, opt ScanOpt) error {
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columns, err := rows.Columns()
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if err != nil {
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return err
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}
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columnMap := make(map[string]int)
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for i, col := range columns {
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if opt.CaseInsensitive {
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col = strings.ToLower(col)
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}
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_, ok := columnMap[col]
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if ok {
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return errors.New("duplicate column found: " + col + ", consider disable case-insensitive")
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}
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columnMap[col] = i
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}
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destVec := make([]interface{}, len(columns))
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for col, dest := range dest {
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if opt.CaseInsensitive {
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col = strings.ToLower(col)
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}
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idx, ok := columnMap[col]
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if !ok {
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return errors.New("column not found: " + col)
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}
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if destVec[idx] != nil {
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return errors.New("duplicate column dest: " + col)
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}
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destVec[idx] = dest
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}
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for i := range destVec {
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if destVec[i] == nil {
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destVec[i] = &sql.RawBytes{}
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}
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}
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return rows.Scan(destVec...)
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}
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