动态类型参数

描述

在Dapper方法中创建并使用参数。

单次

执行一次SQL命令。

var sql = "EXEC Invoice_Insert";

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

    DynamicParameters parameter = new DynamicParameters();

    parameter.Add("@Kind", InvoiceKind.WebInvoice, DbType.Int32, ParameterDirection.Input);
    parameter.Add("@Code", "Many_Insert_0", DbType.String, ParameterDirection.Input);
    parameter.Add("@RowCount", dbType: DbType.Int32, direction: ParameterDirection.ReturnValue);

    connection.Execute(sql,
        parameter,
        commandType: CommandType.StoredProcedure);

    int rowCount = parameter.Get<int>("@RowCount");
}

多次

执行多次SQL命令。

var sql = "EXEC Invoice_Insert";

var parameters = new List<DynamicParameters>();

for (var i = 0; i < 3; i++)
{
    var p = new DynamicParameters();
    p.Add("@Kind", InvoiceKind.WebInvoice, DbType.Int32, ParameterDirection.Input);
    p.Add("@Code", "Many_Insert_" + (i + 1), DbType.String, ParameterDirection.Input);
    p.Add("@RowCount", dbType: DbType.Int32, direction: ParameterDirection.ReturnValue);

    parameters.Add(p);
}

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

    connection.Execute(sql,
        parameters,
        commandType: CommandType.StoredProcedure
    );

    var rowCount = parameters.Sum(x => x.Get<int>("@RowCount"));
}