github.com/ecodeclub/eorm@v0.0.2-0.20231001112437-dae71da914d0/internal/merger/type.go (about)

     1  // Copyright 2021 ecodeclub
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  // http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package merger
    16  
    17  import (
    18  	"context"
    19  
    20  	"github.com/ecodeclub/eorm/internal/rows"
    21  )
    22  
    23  // Merger 将sql.Rows列表里的元素合并，返回一个类似sql.Rows的迭代器
    24  // Merger sql.Rows列表中每个sql.Rows仅支持单个结果集且每个sql.Rows中列集必须完全相同。
    25  type Merger interface {
    26  	Merge(ctx context.Context, results []rows.Rows) (rows.Rows, error)
    27  }
    28  
    29  type ColumnInfo struct {
    30  	Index int
    31  	Name  string
    32  }
    33  
    34  func NewColumnInfo(index int, name string) ColumnInfo {
    35  	return ColumnInfo{
    36  		Index: index,
    37  		Name:  name,
    38  	}
    39  }