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mysql_util.go
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mysql_util.go
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// Copyright 2022 Teamgram Authors
// All rights reserved.
//
// 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Author: teamgramio (teamgram.io@gmail.com)
//
package sqlx
import (
"context"
"errors"
"fmt"
"github.com/zeromicro/go-zero/core/logx"
"strings"
)
type CommonDAO struct {
db *DB
}
func NewCommonDAO(db *DB) *CommonDAO {
return &CommonDAO{db}
}
func (dao *CommonDAO) DB() *DB {
return dao.db
}
// CheckExists
// 检查是否存在
func (dao *CommonDAO) CheckExists(ctx context.Context, table string, params map[string]interface{}) bool {
if len(params) == 0 {
logx.WithContext(ctx).Errorf("CheckExists - [%s] error: params empty!", table)
return false
}
names := make([]string, 0, len(params))
for k, _ := range params {
names = append(names, k+" = :"+k)
}
sql := fmt.Sprintf("SELECT 1 FROM %s WHERE %s LIMIT 1", table, strings.Join(names, " AND "))
var (
existed int
)
err := dao.db.NamedQueryRowPartial(ctx, &existed, sql, params)
if err != nil && err != ErrNotFound {
logx.WithContext(ctx).Errorf("CheckExists - [%s] error: %s", table, err)
return false
}
return existed == 1
}
func (dao *CommonDAO) CalcSize(ctx context.Context, table string, params map[string]interface{}) int {
if len(params) == 0 {
logx.WithContext(ctx).Errorf("calcSize - [%s] error: params empty!", table)
return 0
}
aValues := make([]interface{}, 0, len(params))
names := make([]string, 0, len(params))
for k, v := range params {
names = append(names, k+" = ?")
aValues = append(aValues, v)
}
sql := fmt.Sprintf("SELECT count(id) FROM %s WHERE %s", table, strings.Join(names, " AND "))
var count int
err := dao.db.QueryRow(ctx, &count, sql, aValues...)
if err != nil {
logx.Errorf("calcSize - [%s] error: %s", sql, err)
return 0
}
return count
}
func (dao *CommonDAO) CalcSizeByWhere(ctx context.Context, table, where string) int {
sql := fmt.Sprintf("SELECT count(id) FROM %s WHERE %s", table, where)
var count int
err := dao.db.QueryRow(ctx, &count, sql)
if err != nil {
logx.Errorf("calcSize - [%s] error: %s", sql, err)
return 0
}
return count
}
// CheckExists
// 检查是否存在
func CheckExists(ctx context.Context, db *DB, table string, params map[string]interface{}) (bool, error) {
if len(params) == 0 {
logx.WithContext(ctx).Errorf("checkExists - [%s] error: params empty!", table)
return false, errors.New("params empty")
}
names := make([]string, 0, len(params))
for k, _ := range params {
names = append(names, k+" = :"+k)
}
sql := fmt.Sprintf("SELECT 1 FROM %s WHERE %s LIMIT 1", table, strings.Join(names, " AND "))
var (
existed int
)
err := db.NamedQueryRowPartial(ctx, &existed, sql, params)
if err != nil && err != ErrNotFound {
logx.WithContext(ctx).Errorf("CheckExists - [%s] error: %s", table, err)
return false, err
}
return existed == 1, nil
}