Dapper逆天入门~强类型,动态类型,多映射,多返回值,增删改查+存储过程案例演示
时间:2022-05-07
本文章向大家介绍Dapper逆天入门~强类型,动态类型,多映射,多返回值,增删改查+存储过程案例演示,主要内容包括其使用实例、应用技巧、基本知识点总结和需要注意事项,具有一定的参考价值,需要的朋友可以参考一下。
Dapper的牛逼就不扯蛋了,答应群友做个入门Demo的,现有园友需要,那么公开分享一下:
完整Demo:http://pan.baidu.com/s/1i3TcEzj 注 意 事 项:http://www.cnblogs.com/dunitian/p/5221058.html 平台之大势何人能挡? 带着你的Net飞奔吧! http://www.cnblogs.com/dunitian/p/4822808.html#skill
先安装一下Dapper(建议用nuget包来管理)
连接字符串:
string connStr = "Data Source=.;Initial Catalog=DapperDB;User ID=用户名;Password=密码";
强类型:
#region 强类型
//public static IEnumerable<T> Query<T>(this IDbConnection cnn, string sql, object param = null, SqlTransaction transaction = null, bool buffered = true)
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
//无参查询
//var qqModeList = conn.Query<QQModel>("select Id,Name,Count from QQModel");
//带参查询
var qqModeList = conn.Query<QQModel>("select Id,Name,Count from QQModel where Id in @id and Count>@count", new { id = new int[] { 1, 2, 3, 4, 5, 6 }, count = 1 });
foreach (var item in qqModeList)
{
Console.WriteLine(item.Id + " " + item.Name + " " + item.Count);
}
}
#endregion
动态类型:
#region 动态类型
////逆天动态类型用的比较多[可能是MVC ViewBag用多了]
//public static IEnumerable<dynamic> Query (this IDbConnection cnn, string sql, object param = null, SqlTransaction transaction = null, bool buffered = true)
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
var qqModeList = conn.Query("select Id,Name,Count from QQModel").ToList();
foreach (var item in qqModeList)
{
Console.WriteLine(item.Id + " " + item.Name + " " + item.Count);
}
}
#endregion
多映射:
using (SqlConnection conn = new SqlConnection(connStr))
{
string sqlStr = @"select A.Id,A.Title,S.SeoKeywords from Article A
inner join SeoTKD S on A.SeoId=S.Id
where A.Id in @ids";
conn.Open();
var articleList = conn.Query(sqlStr, new { ids = new int[] { 41, 42, 43, 44, 45, 46, 47, 48 } });
foreach (var item in articleList)
{
Console.WriteLine(item.Id + " | " + item.SeoKeywords + " | :" + item.Title);
}
}
多返回值:
using (SqlConnection conn = new SqlConnection(connStr))
{
string sqlStr = @"select Id,Title,Author from Article where Id = @id
select * from QQModel where Name = @name
select * from SeoTKD where Status = @status";
conn.Open();
using (var multi = conn.QueryMultiple(sqlStr, new { id = 11, name = "打代码", status = 99 }))
{
//multi.IsConsumed reader的状态 ,true 是已经释放
if (!multi.IsConsumed)
{
//注意一个东西,Read获取的时候必须是按照上面返回表的顺序 (article,qqmodel,seotkd)
//强类型
var articleList = multi.Read<Temp>();//类不见得一定得和表名相同
var QQModelList = multi.Read<QQModel>();
var SeoTKDList = multi.Read<SeoTKD>();
//动态类型
//var articleList = multi.Read();
//var QQModelList = multi.Read();
//var SeoTKDList = multi.Read();
#region 输出
foreach (var item in QQModelList)
{
Console.WriteLine(item.Id + " " + item.Name + " " + item.Count);
}
foreach (var item in SeoTKDList)
{
Console.WriteLine(item.Id + " | " + item.SeoKeywords);
}
foreach (var item in articleList)
{
Console.WriteLine(item.Author);
}
#endregion
}
}
}
增删改查:(删项目里面基本上不用)
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
//增
int count = conn.Execute("insert into Article values(@title,@content,@author,961,1,2,2,N'2015-11-23 11:06:36.553',N'2015-11-23 11:06:36.553',N'5,103,113',91,N'3,5,11',0,N'/Images/article/16.jpg')", new { title = "Title1", content = "TContent1", author = "毒逆天" });
//改
//int count = conn.Execute("update Article set Title=@title where Id=@id", new { title = "么么哒", id = 274 });
if (count > 0)
{
Console.WriteLine(count + "条操作成功");
}
}
存储过程:
//查询
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
//参数名得和存储过程的变量名相同(参数可以跳跃传,键值对方式即可)
//动态类型
//var list = conn.Query("usp_test", new { aId = 11 }, commandType: CommandType.StoredProcedure);
//强类型
var list = conn.Query<TitleAndKeyWords>("usp_test", new { aId = 11 }, commandType: CommandType.StoredProcedure);
foreach (var item in list)
{
Console.WriteLine(item.Id + " | " + item.SeoKeywords + " | :" + item.Title);
}
}
//插入
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
int count = conn.Execute("usp_insertArticle", new { title = "Title11", content = "TContent1", author = "毒逆天" }, commandType: CommandType.StoredProcedure);
if (count > 0)
{
Console.WriteLine(count + "条操作成功");
}
}
//更新
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
int count = conn.Execute("usp_updateArticle", new { id = 276, title = "Dapper使用" }, commandType: CommandType.StoredProcedure);
if (count > 0)
{
Console.WriteLine(count + "条操作成功");
}
}
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