github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/pkg/sqlmodel/utils.go (about)

     1  // Copyright 2022 PingCAP, Inc.
     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  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package sqlmodel
    15  
    16  import (
    17  	"fmt"
    18  	"strings"
    19  
    20  	timodel "github.com/pingcap/tidb/pkg/parser/model"
    21  )
    22  
    23  func getColsAndValuesOfIdx(
    24  	columns []*timodel.ColumnInfo,
    25  	indexColumns *timodel.IndexInfo,
    26  	data []interface{},
    27  ) ([]*timodel.ColumnInfo, []interface{}) {
    28  	cols := make([]*timodel.ColumnInfo, 0, len(indexColumns.Columns))
    29  	values := make([]interface{}, 0, len(indexColumns.Columns))
    30  	for _, col := range indexColumns.Columns {
    31  		cols = append(cols, columns[col.Offset])
    32  		values = append(values, data[col.Offset])
    33  	}
    34  
    35  	return cols, values
    36  }
    37  
    38  // valuesHolder gens values holder like (?,?,?).
    39  func valuesHolder(n int) string {
    40  	var builder strings.Builder
    41  	builder.Grow((n-1)*2 + 3)
    42  	builder.WriteByte('(')
    43  	for i := 0; i < n; i++ {
    44  		if i > 0 {
    45  			builder.WriteString(",")
    46  		}
    47  		builder.WriteString("?")
    48  	}
    49  	builder.WriteByte(')')
    50  	return builder.String()
    51  }
    52  
    53  // generatedColumnsNameSet returns a set of generated columns' name.
    54  func generatedColumnsNameSet(columns []*timodel.ColumnInfo) map[string]struct{} {
    55  	m := make(map[string]struct{})
    56  	for _, col := range columns {
    57  		if col.IsGenerated() {
    58  			m[col.Name.L] = struct{}{}
    59  		}
    60  	}
    61  	return m
    62  }
    63  
    64  // ColValAsStr convert column value as string
    65  func ColValAsStr(v interface{}) string {
    66  	switch dv := v.(type) {
    67  	case []byte:
    68  		return string(dv)
    69  	case string:
    70  		return dv
    71  	}
    72  	return fmt.Sprintf("%v", v)
    73  }