轻量级ORM框架Dapper应用支持操作函数和事物

dapper除了支持基础的CURD、存储过程以外，还支持操作函数和事物。

dapper操作函数的代码如下：

using Dapper;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace DapperDemo
{
    public static class OperFunction
    {
        /// <summary>
        /// Dapper滴调用函数
        /// </summary>
        public static void ExecuteFunction()
        {
            // 连接字符串
            string strCon = ConfigurationManager.ConnectionStrings["DbConnection"].ConnectionString;
            // connection对象
            IDbConnection dbConnection = new SqlConnection(strCon);
            // 定义参数
            DynamicParameters paras = new DynamicParameters();
            paras.Add("@num1", 34);
            paras.Add("@num2", 456);
            // 返回值
            paras.Add("@sum", 0, DbType.Int32, ParameterDirection.ReturnValue);
            string functionName = "fun_test";
            // 执行
            int count = dbConnection.Execute(functionName, paras, null, null, CommandType.StoredProcedure);
            // 获取输出参数的值
            int sum = paras.Get<int>("@sum");
            Console.WriteLine("sum:" + sum);//输出390
        }
    }
}

dapper支持事物的代码如下：

using Dapper;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace DapperDemo
{
    public static class OperTransaction
    {
        /// <summary>
        /// Dapper支持事物
        /// </summary>
        public static void ExecuteTransaction()
        {
            // 连接字符串
            string strCon = ConfigurationManager.ConnectionStrings["DbConnection"].ConnectionString;
            // connection对象
            IDbConnection dbConnection = new SqlConnection(strCon);
            string strSQL = "DELETE FROM Student WHERE StudentID=@StudentID";
            DynamicParameters paras = new DynamicParameters();
            paras.Add("@StudentID", 3);
            // 在BeginTransaction之前要打开连接，否则报错：无效操作，连接已关闭
            dbConnection.Open();
            // 开启事物
            IDbTransaction transaction = dbConnection.BeginTransaction();
            try
            {
                dbConnection.Execute(strSQL, paras, transaction: transaction);
                // 提交事务
                transaction.Commit();
            }
            catch (Exception ex)
            {
                // 回滚事物
                transaction.Rollback();
            }
        }
    }
}

Dapper除了支持Transaction以外，还支持Transactionscope：

public static void ExecuteTransactionScope()
{
      using (var transactionscope = new TransactionScope(TransactionScopeOption.Required))
      {
            // 连接字符串
            string strCon = ConfigurationManager.ConnectionStrings["DbConnection"].ConnectionString;
            // connection对象
            IDbConnection dbConnection = new SqlConnection(strCon);
            string strSQL = "DELETE FROM Student WHERE StudentID=@StudentID";
            DynamicParameters paras = new DynamicParameters();
            paras.Add("@StudentID", 6);
            dbConnection.Open();
            try
            {
                dbConnection.Execute(strSQL, paras);
                transactionscope.Complete();
            }
            catch (Exception ex)
            {
                // 不提交事务默认自动回滚
                Console.WriteLine(ex.Message);
            }
      }
}

到此这篇关于Dapper支持操作函数和事物的文章就介绍到这了。希望对大家的学习有所帮助，也希望大家多多支持易知道(ezd.cc)。