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为EasySharding.EFCore提供Dapper相关查询扩展

承接上一篇博文中的中间件基本都是写入性的操作,但对于查询操作实际上是比较鸡肋的,如果单纯的查询,没有分表的情况下基本还能适应,这里为了Dapper提供了扩展

Dapper的扩展查询是需要写表名称的,所以对于开发人员来说需要写表名称,同一个业务的查询就会出现问题,每个业务里面都需要去判断业务上的表名称,不利于开发维护,易出错的问题

所以扩展了 EasySharding.EFCore.DapperExtension 让开发人员不用过于关注表名称,只需要关注那些业务表有分表就行了

例如:

  #region GetDbConnection
        /// <summary>
        /// 扩展给Dapper调用 支持分库分表
        /// </summary>
        /// <typeparam name="TContext"></typeparam>
        /// <param name="shardingConnection"></param>
        /// <returns></returns>
        public static ShardingDbConnection GetShardingDbConnection<TContext>(this TContext context) where TContext : ShardingDbContext
        {

            return (ShardingDbConnection)Activator.CreateInstance(typeof(ShardingDbConnection), context.Database.GetDbConnection(), context.ShardingInfo);


        }
        /// <summary>
        /// 支持分库 默认支持
        /// </summary>
        /// <typeparam name="TContext"></typeparam>
        /// <param name="shardingConnection"></param>
        /// <returns></returns>
        public static DbConnection GetDbConnection<TContext>(this TContext context) where TContext : ShardingDbContext
        {
            return context.Database.GetDbConnection();
        }
        #endregion

        #region Query
        /// <summary>
        /// 格式化分表查询处理 需要分表写 分表业务加上标记 注意sql语句中其他元素冲突{0} 
        /// 如:Select * from {TableName} as a  join TB1 on a.id=b.id 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="shardingcon"></param>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static IEnumerable<T> QuerySharding<T>(this ShardingDbConnection shardingcon, string sql, object[] param = null) where T : class
        {

            return shardingcon._dbConnection.Query<T>(sql.SqlSharding(shardingcon._ShardingInfo.GetName()), param);

        }

        public static IEnumerable<dynamic> QuerySharding(this ShardingDbConnection shardingcon, string sql, object[] param = null)
        {

            return shardingcon._dbConnection.Query(sql.SqlSharding(shardingcon._ShardingInfo.GetName()), param);

        }
        /// <summary>
        /// 异步方法  格式化分表查询处理 需要分表写 分表业务加上标记 注意sql语句中其他元素冲突{0} 
        /// 如:Select * from {TableName} as a  join TB1 on a.id=b.id 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="shardingcon"></param>
        /// <param name="sql"></param>
        /// <param name="param"></param>
        /// <returns></returns>
        public static async Task<IEnumerable<T>> QueryShardingAsync<T>(this ShardingDbConnection shardingcon, string sql, object[] param = null) where T : class
        {

            return await shardingcon._dbConnection.QueryAsync<T>(sql.SqlSharding(shardingcon._ShardingInfo.GetName()), param);

        }

        public static async Task<IEnumerable<dynamic>> QueryShardingAsync(this ShardingDbConnection shardingcon, string sql, object[] param = null)
        {

            return await shardingcon._dbConnection.QueryAsync(sql.SqlSharding(shardingcon._ShardingInfo.GetName()), param);

        }
        #endregion
View Code

扩展了对分库连接的Dapper支持方便

using var conquery = context.GetContext().GetDbConnection();
            var testlst = conquery.Query<MySql.Test>("select * from Test");

            using var conquery2 = context.GetShardingContext(new ShardingInfo
            {
                DatabaseTagName = $"easysharding",
                StufixTableName = $"1",
                ConStr = $"dbstr1",
            });
            var conquerysharding = conquery2.GetShardingDbConnection();
            var testlst2 = conquerysharding.QuerySharding<MySql.Test>("select * from {Test}");
View Code

针对Sql中的表名称不需要关注具体表名称,知道业务表分表主题名称即可通过{TableName}加上花括号的方式 ,对应分库分表连接的上下文确定具体表操作。

 

GitHub:https://github.com/woshilangdanger/easysharding.efcore

 

posted @ 2021-11-09 15:07  龙码精神  阅读(160)  评论(0编辑  收藏  举报