Dapper 第八篇 QueryMultiple 方法介绍

描述

QueryMultiple方法是一种扩展方法，可以从IDbConnection类型的任何对象调用。它可以在同一命令中执行多个查询并映射结果。

string sql = "SELECT * FROM Invoice WHERE InvoiceID = @InvoiceID; SELECT * FROM InvoiceItem WHERE InvoiceID = @InvoiceID;";

using (var connection = My.ConnectionFactory())
{
    connection.Open();

    using (var multi = connection.QueryMultiple(sql, new {InvoiceID = 1}))
    {
        var invoice = multi.Read<Invoice>().First();
        var invoiceItems = multi.Read<InvoiceItem>().ToList();
    }
}

参数
下表显示了QueryFirstOrDefault方法的不同参数。