.NET Core通过PetaPoco操作mysql、sqlserver等

最新推荐文章于 2024-05-29 10:24:12 发布

转载最新推荐文章于 2024-05-29 10:24:12 发布 · 1k 阅读

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原文链接：https://blog.youkuaiyun.com/WuLex

文章标签：

#mysql #sqlserver #数据库 #PetaPoco #NET

本文介绍了如何在.NET Core项目中集成PetaPoco.NetCore ORM，包括配置步骤、数据库操作实例，并展示了其在简化数据库操作和测试上的优势。

一、引入PetaPoco.NetCore，PetaPoco.NetCore 是基于PetaPoco的轻量ORM，支持.netframework和.netcore，支持单个实体对象映射，也支持多实体对象映射，NetCore未需指定驱动连接，其它API一致。

github地址：https://github.com/qingask/PetaPoco.NetCore

nugut地址：https://www.nuget.org/packages/PetaPoco.NetCore

通过nuget安装 PM>Install-Package PetaPoco.NetCore

二、.net core配置

在project.json增加相应.netcore版本的数据库驱动引用，这里mysql的驱动使用Pomelo.Data.MySql，mysql官方的netcore版本驱动兼容性太差，坑太多，等完善后可替换为官方的mysql core驱动

"dependencies": { 
"Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0-rc2-final", 
"Microsoft.Extensions.Configuration.Json": "1.0.0-rc2-final", 
"Microsoft.Extensions.Configuration.UserSecrets": "1.0.0-rc2-final", 
"Microsoft.NETCore.App": { 
"version": "1.0.0-rc2-3002702", 
"type": "platform" 
}, 
"Pomelo.Data.MySql": "1.0.0", 
"System.Text.Encoding.CodePages": "4.0.1" 
}

三、使用`PetaPoco.NetCore`

1.测试sql

CREATE TABLE blogs (
BlogId int(11) NOT NULL PRIMARY KEY,
Url varchar(1000) DEFAULT NULL
);
 
create table post(
id int,
title varchar(32),
author int
);
 
drop table author;
create table author(
id int,
name varchar(32)
);
INSERT into blogs values(1,'test1'); INSERT into blogs values(2,'test2');
 
INSERT into author value(1,'作者1'); INSERT into author value(2,'作者2');
 
INSERT into post values(1,'book1',1); INSERT into post values(2,'book2',1); INSERT into post values(3,'book3',2); INSERT into post values(4,'book4',2);

2.使用`PetaPoco.NetCore`

MySqlConnection connection = new MySqlConnection(""server=localhost;database=test;uid=root;password=123456;charset=utf8;SslMode=None"");
 var db = new Database(connection);
 //实体测试
 Blog blog = new Blog() { BlogId = 3, Url = "test3" };
 //保存
 var result = db.Insert(blog);
   //编辑
 blog.Url = "test333";
 result = db.Update(blog);
    //删除
 result = db.Delete(blog);
 
 //sql测试
 var sql1 = Sql.Builder.Append("insert into blogs values(4,'test4')");
 result = db.Execute(sql1);
 var sql2 = Sql.Builder.Append("update blogs set Url='test444' where BlogId=4");
 result = db.Execute(sql2);
 
 //查询
 var model2 = db.SingleOrDefault<Blog>(1);
   //列表
 var list = db.Query<Blog>(Sql.Builder.Append("select * from blogs")).ToList();
   //分页
 var list2 = db.Page<Blog>(1, 2, Sql.Builder.Append("select * from blogs"));
   //查询
 var sql3 = Sql.Builder.Append("select * from blogs where BlogId=4");
 var model1 = db.Query<Blog>(sql3).FirstOrDefault();
 var model3 = db.FirstOrDefault<Blog>(sql3);
 
 //返回多个结果测试
 result = db.Fetch<post, author, post>(
 (p, a) =>
 {
     p.author_obj = a;
     return p;
 },
 @"SELECT * FROM post LEFT JOIN author ON post.author = author.id ORDER BY post.id");
 
 using (var multi = db.QueryMultiple("select * from post"))
 {
     result = multi.Read<post>().ToList();
 }
 using (var multi = db.QueryMultiple(@"SELECT * FROM post LEFT JOIN author ON post.author = author.id ORDER BY post.id"))
 {
     result = multi.Read<post, author, post>((p, a) => { p.author_obj = a; return p; }).ToList();
 }
 using (var multi = db.QueryMultiple("select * from post;select * from author;"))
 {
     var p = multi.Read<post>().First();
     var a = multi.Read<author>().First();
 }