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string.go
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/
string.go
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// Copyright 2020 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package model
import (
"strings"
cerror "github.com/tikv/migration/cdc/pkg/errors"
)
// HolderString returns a string of place holders separated by comma
// n must be greater or equal than 1, or the function will panic
func HolderString(n int) string {
var builder strings.Builder
builder.Grow((n-1)*2 + 1)
for i := 0; i < n; i++ {
if i > 0 {
builder.WriteString(",")
}
builder.WriteString("?")
}
return builder.String()
}
// ExtractKeySuffix extracts the suffix of an etcd key, such as extracting
// "6a6c6dd290bc8732" from /tidb/cdc/changefeed/config/6a6c6dd290bc8732
func ExtractKeySuffix(key string) (string, error) {
subs := strings.Split(key, "/")
if len(subs) < 2 {
return "", cerror.ErrInvalidEtcdKey.GenWithStackByArgs(key)
}
return subs[len(subs)-1], nil
}