}returnExecuteCommand(cnn,refcommand, param ==null?null: info.ParamReader); } privatestaticIEnumerable<T> QueryImpl<T>(thisIDbConnection cnn, CommandDefinition command, Type effectiveType) {objectparam =command.Parameters;varidentity =newIdentity(command.CommandText, command.CommandType, cnn, effectiveTy...
In the above code, the CommandDefinition command argument still has a valid Parameters collection, but the local variable IDbCommand cmd comes out of SetupCommand with, strangely enough, two empty Parameters collections. So there seems to be some fault with SetupCommand or info.Param...
...Dapper是如何工作的 它可以分为三个步骤: 创建一个IDbConnection接口对象; 编写一个查询SQL来执行CRUD操作; 将查询SQL作为Execute方法的参数传递。...方法Dapper会用以下几个方法扩展您的IDbConnection接口: Execute Query QueryFirst QueryFirstOrDefault QuerySingle QuerySingleOrDefault...QueryMultiple string sql...
2、Dapper中执行存上面的储过程返回输出参数 varparameters =newDynamicParameters(entity); parameters.Output(entity, x => x.Id); awaitconn.ExecuteAsync( "TodoItemInsert", parameters, commandType: CommandType.StoredProcedure); 相关文档:ASP.NET Core 2.1 中异步使用Dapper总结 .NET Core Dapper(ORM) 执行sq...
//////执行语句,返回输出参数值///publicvoidTestExecuteCommandWithHybridParameters() {varp =newDynamicParameters(new{ a =1, b =2}); p.Add("c", dbType: DbType.Int32, direction: ParameterDirection.Output); connection.Execute(@"set @c = @a + @b", p); p.Get<int>("@c"...
varresult = connection.ExecuteScalar("SELECT @Value",new{ Value =1}); 資料類型 Dapper 會使用 SqliteDataReader 索引子來讀取值。 該索引子的傳回型別是物件,這表示它只會傳回 long、double、string 或 byte[] 值。 如需更多資訊,請見資料類型。 Dapper 會處理這些類型與其他基本類型之間的大部分轉換。
varparameters =newDynamicParameters; // 映射实体属性到参数 // parameters.Add("@Property1", entity.Property1); // ... await_dbConnection.ExecuteAsync(sql, parameters); } publicasyncTaskUpdateAsync(T entity) { stringsql ="UPDATE YourTableName SET Column1 = @Property1, Column2 = @Property2,...
return_connection.ExecuteScalar<int>(sql, param, _transaction, _commandTimeout, commandType); } publicasyncTask<int>ExecuteScalarAsync(stringsql,objectparam =null, CommandType commandType = CommandType.Text) { returnawait_connection.ExecuteScalarAsync<int>(sql, param, _transaction, _commandTimeout, co...
)whereT :class;//////执行sql/////////////////////<returns></returns>intExecute(stringsql,objectparam, IDbTransaction transaction=null,int? commandTimeout =null, CommandType commandType=CommandType.Text ); } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16....
4.在这篇文章http://stackoverflow.com/questions/10933366/sp-executesql-is-slow-with-parameters中并且也用的是Dapper,解决方式是加了 WITH RECOMPILE 语句 parameter-sniffing Query runs fast, but runs slow in stored procedure SQL Server: Query fast, but slow from procedure ...