var emps = connection.Query(sql, new { ename = new DbString { Value = "卢俊义", IsFixedLength = false, Length = 9, IsAnsi = true } }).ToList(); } 四、异步 Dapper还使用了Async(异步)方法扩展了IDbConnection接口: ExecuteAsync QueryAsync QueryFirstAsync QueryFirstOrDefaultAsync QuerySingle...
Dapper QueryAsync To execute the query asynchronously, Dapper provides theQueryAsyncmethod, an asynchronous version of theQuerymethod. language-csharp Explain code|Copy codeCopied! var sql = "SELECT * FROM Product WHERE CategoryID = @categoryID"; var products = (await connection.QueryAsync(sql, ...
[OrderItem] WHERE OrderID = @orderID; "; using (var multi = await connection.QueryMultipleAsync(sql, new {orderID = 1})) { var order = multi.ReadFirst<Order>(); var orderItems = multi.Read<OrderItem>().ToList(); FiddleHelper.WriteTable("Order", new List<Order>() { order}); ...
QueryAsync是Dapper提供的一个异步查询方法,用于执行带有参数的SQL查询语句并返回结果集。该方法接受两个参数,分别是SQL查询语句和查询参数。 SQL查询语句:指定需要执行的SQL查询语句,可以包含参数占位符。 查询参数:是一个匿名类型对象或者动态类型对象,用于传递查询参数值。 使用QueryAsync方法可以获得如下优势: 高性能:...
usingSystem.Threading.Tasks;namespacedapperDemo{classProgram{staticasyncTaskMain(string[] args){#region原生dapper封装DapperHelper dapper =newDapperHelper();#region查询集合Console.WriteLine("---查询集合---");varstudents =awaitdapper.QueryAsync<Student>("select * from Student"); Console.WriteLine(Json...
ToList(); }, beginTransaction); } public async Task<IEnumerable<T>> QueryListAsync<T>(string cmd, object param, CommandType? commandType = null, bool beginTransaction = false) { return await ExecuteAsync(async (conn, dbTransaction) => { return await conn.QueryAsync<T>(cmd, param, db...
带两个参数的Dapper QueryAsync dapper 我想知道是否有这样的方法: string sql = "SELECT * FROM TABLE WHERE ID = @ID AND VALUE = @VALUE"; var listTest = await _dbConnection.QueryAsync<Example>(sql, ID, VALUE); 我想查询一个具有复合主键的表。
(await DbConnection.QueryAsync<Model>(sql)).ToList(); }); return task 现在我得到了return type of an 'async' anonymous function must be a 'void', 'Task', 'Task<T>', a task-like type, 'IAsyncEnumerable<T>', or 'lAsyncEnumerator<T>' ...
前言1.DapperDapper是由Stack Overflow背后的团队创建的micro-ORM。Dapper 是 .NET 的简单对象映射器,在速度方...
var err_sql = new List<string>(); var all_log = new List<string>(); int i = 1; customTiming.Value?.ForEach(value => { if (value.ExecuteType != "OpenAsync") all_sql.Add(value.CommandString); if (value.Errored) err_sql.Add(value.CommandString); ...