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conn.go
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/
conn.go
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// Copyright 2019 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 diff
import (
"context"
"database/sql"
"github.com/pingcap/errors"
"github.com/pingcap/tidb-tools/pkg/dbutil"
)
// CreateDB creates sql.DB used for select data
func CreateDB(ctx context.Context, dbConfig dbutil.DBConfig, num int) (db *sql.DB, err error) {
db, err = dbutil.OpenDB(dbConfig)
if err != nil {
return nil, errors.Errorf("create db connections %s error %v", dbConfig.String(), err)
}
// SetMaxOpenConns and SetMaxIdleConns for connection to avoid error like
// `dial tcp 10.26.2.1:3306: connect: cannot assign requested address`
db.SetMaxOpenConns(num)
db.SetMaxIdleConns(num)
return db, nil
}
// CreateDBForCP creates sql.DB used for write data for checkpoint
func CreateDBForCP(ctx context.Context, dbConfig dbutil.DBConfig) (cpDB *sql.DB, err error) {
// set snapshot to empty, this DB used for write checkpoint data
dbConfig.Snapshot = ""
cpDB, err = dbutil.OpenDB(dbConfig)
if err != nil {
return nil, errors.Errorf("create db connections %+v error %v", dbConfig, err)
}
cpDB.SetMaxOpenConns(1)
cpDB.SetMaxIdleConns(1)
return cpDB, nil
}