C#给SqlSugar封装一个单例类

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可以直接用，轻量方便，无需重复造轮子。 这里只对CRUD进行封装，我的应用比较简单。

using SqlSugar;
using System.Collections.Generic;


namespace MusicApp.Assist
{
    internal class SqlSugarAssist
    {
        private static readonly object _lock = new object();
        private static SqlSugarAssist _instance;
        private readonly ISqlSugarClient _db;
        private SqlSugarAssist(string connectionString)
        {
            _db = new SqlSugarClient(new ConnectionConfig()
            {
                ConnectionString = connectionString,
                DbType = DbType.SqlServer, // 或其他数据库类型
                IsAutoCloseConnection = true
            });
        }

        ///单例实现
        public static SqlSugarAssist GetInstance(string connectionString) 
        {
            if (_instance == null) 
            {
                lock (_lock) {
                    if (_instance == null) 
                    {
                        _instance=new SqlSugarAssist(connectionString); 


                    }
                }
            }
            return _instance;
        }



        // 插入操作
        public int Insert<T>(T entity) where T : class,new()
        {
            return _db.Insertable(entity).ExecuteCommand();
        }

        // 删除操作
        public int Delete<T>(dynamic list) where T : class, new()
        {
            return _db.Deleteable<T>(list).ExecuteCommand();
        }

        // 更新操作
        public int Update<T>(T entity) where T : class, new()
        {
            return _db.Updateable(entity).ExecuteCommand();
        }

        // 查询操作
        public List<T> Select<T>()
        {
            return _db.Queryable<T>().ToList();
        }

    }
}