ASP.NET Core 2.0系列学习笔记-ORM框架之Dapper
ORM框架之Dapper，项目测试环境：.NET Core2.0 ConsoleApp应用；
新建ConsoleApp应用（项目命名DapperApp），添加NuGet引用，如下图所示：
项目添加=》新建文件夹=》Model添加实体类：DETAILS和TB_TYPE，数据库对应表模型。
public class DETAILS
{
public string Id { get; set; }
public string Title { get; set; }
public string Mark { get; set; }
public string Content { get; set; }
public DateTime Date { get; set; }
public int ReadCount { get; set; }
public string Writer { get; set; }
public short TypeId { get; set; }
public string PartContent { get; set; }
public short SubId { get; set; }
}public class TB_TYPE
{
public short Id { get; set; }
public string TypeName { get; set; }
}在Program的Main方法中添加测试：
using System;
using Dapper;
using System.Data;
using System.Data.SqlClient;
using DapperApp.Model;
using System.Collections.Generic;
using Newtonsoft.Json;
using System.Threading.Tasks;
namespace DapperApp
{
class Program
{
private static string sqlconnStr = "Server=.;Database=Test;uid=sa;pwd=123456";
static void Main(string[] args)
{
Console.WriteLine("Hello Dapper!");
//Query();
//QueryAsync();
QueryJoin();
//QueryInData();
//QueryMultiTable();
//QueryMultiTableAsync();
//Insert();
//Update();
//UpdateKeyVal();
//Delete();
Proc();
}
///
/// T-SQL查询，返回单一数据集
///
private static void Query()
{
using (var db = new SqlConnection(sqlconnStr))
{
string sql = "SELECT [ID],[TITLE],[MARK],[CONTENT],[DATE],[READCOUNT],[WRITER],[TYPEID],[PARTCONTENT],[SUBID] FROM [dbo].[TB_DETAILS]";
var query = db.Query(sql);
foreach (var item in query)
{
var str = $"{item.Id} {item.Title} {item.Mark} {item.Content} {item.Date} {item.ReadCount} {item.Writer} {item.TypeId} {item.PartContent} {item.SubId}";
Console.WriteLine(str);
}
}
}
///
/// 异步T-SQL查询，返回单一数据集
///
///
/// T-SQL-IN查询，返回单一数据集
///
private static void QueryInData()
{
using (var db = new SqlConnection(sqlconnStr))
{
///注意sql语句底层会包装T-SQL-IN语句
string sql = "SELECT [TITLE],[MARK],[CONTENT],[DATE] FROM [dbo].[TB_DETAILS] WHERE [MARK] IN @MARK";
///匿名类参数
var query = db.Query(sql, new { mark = new string[3] { "李四测试", "李四测试2", "afd" } });
foreach (var item in query)
{
var str = $"{item.Title} {item.Mark} {item.Content} {item.Date}";
Console.WriteLine(str);
}
}
}
///
/// 多表查询，返回多数据集
///
private static void QueryMultiTable()
{
using (var db = new SqlConnection(sqlconnStr))
{
///多sql语句执行，返回多数据集
string sql = "SELECT * FROM [dbo].[TB_DETAILS];SELECT * FROM [dbo].[TB_TYPE]";
///匿名类参数
var queryMulti = db.QueryMultiple(sql);
var details = queryMulti.Read();
var type = queryMulti.Read();
//处理键值对模型对象
List> list = new List>();
list.Add(new KeyValuePair("details", details));
list.Add(new KeyValuePair("type", type));
AjaxResult ajaxResult = new AjaxResult() { Code = "0", Msg = "OK", Data = list, Sum = list.Count };
//string jsonStr = JsonConvert.SerializeObject(ajaxResult);
Console.WriteLine($"{JsonConvert.SerializeObject(ajaxResult)}");
}
}
///
/// 异步多表查询，返回多数据集
///
private async static Task QueryMultiTableAsync()
{
using (var db = new SqlConnection(sqlconnStr))
{
///多sql语句执行，返回多数据集
string sql = "SELECT * FROM [dbo].[TB_DETAILS];SELECT * FROM [dbo].[TB_TYPE]";
///匿名类参数
var queryMulti = await db.QueryMultipleAsync(sql);
var details = queryMulti.ReadAsync();
var type = queryMulti.ReadAsync();
List> list = new List>();
list.Add(new KeyValuePair("details", details));
list.Add(new KeyValuePair("type", type));
AjaxResult ajaxResult = new AjaxResult() { Code = "0", Msg = "OK", Data = list, Sum = list.Count };
//string jsonStr = JsonConvert.SerializeObject(ajaxResult);
Console.WriteLine($"{JsonConvert.SerializeObject(ajaxResult)}");
}
}
///
/// T-SQL-JOIN语句
///
private static void QueryJoin()
{
using (var db = new SqlConnection(sqlconnStr))
{
///注意sql语句底层会包装T-SQL-JOIN语句
string sql = "SELECT A.TITLE,A.MARK,A.[DATE],B.TYPENAME FROM [dbo].[TB_DETAILS] AS A JOIN [dbo].[TB_TYPE] AS B ON A.TYPEID = B.ID WHERE B.TYPENAME = '设计'";
//DETAILS：实体模型，TB_TYPE：实体模型，DETAILS：返回实体模型
var result = db.Query(sql,(details,users) => {
//对应参数details-》DETAILS，users -》TB_TYPE
details.TypeId = users.Id;
return details; //返回DETAILS
},splitOn:"TypeName"); //以TypeName分割
AjaxResult ajaxResult = new AjaxResult() { Code = "0", Msg = "OK", Data = result, Sum = 0 };
//string jsonStr = JsonConvert.SerializeObject(ajaxResult);
Console.WriteLine($"{JsonConvert.SerializeObject(ajaxResult)}");
}
}
///
/// 单语句sql添加操作。返回受影响行数
///
private static void Insert()
{
using (var db = new SqlConnection(sqlconnStr))
{
string sql = "INSERT INTO [dbo].[TB_DETAILS](ID,TITLE,MARK) VALUES(@ID,@TITLE,@MARK)";
///匿名类模型
int count = db.Execute(sql, new
{
ID = "1a33ed8f501b475dac40cc5ecf728306",
TITLE = "Test",
MARK = "afd"
});
AjaxResult ajaxResult = new AjaxResult() { Code = "0", Msg = "OK", Data = count, Sum = count };
}
}
///
/// 单条或多条数据添加
///
private static void InsertBulk()
{
using (var db = new SqlConnection(sqlconnStr))
{
string sql = "INSERT INTO [dbo].[TB_DETAILS]([ID],[TITLE],[MARK],[CONTENT],[DATE],[READCOUNT],[WRITER],[TYPEID],[PARTCONTENT] ,[SUBID]) VALUES(@ID,@TITLE,@MARK,@CONTENT,@DATE,@READCOUNT,@WRITER,@TYPEID,@PARTCONTENT,@SUBID)";
//实体类模型对象
DETAILS details = new DETAILS()
{
Id = "1a33ed8f501b475dac40cc5ecf728308",
Title = "Test",
Mark = "afd",
Content = "sf",
Date = DateTime.Now,
ReadCount = 3,
Writer = "zuzhe",
TypeId = 5,
PartContent = "sdfds",
SubId = 2
};
var c = db.Execute(sql,details); //单条数据添加
List list = new List() {
new DETAILS{
Id = "1a33ed8f501b475dac40cc5ecf728309",
Title ="Test", Mark = "afd",
Content ="sf",
Date = DateTime.Now,
ReadCount = 3,
Writer = "zuzhe",
TypeId = 5,
PartContent = "sdfds",
SubId = 2
},
new DETAILS{
Id = "1a33ed8f501b475dac40cc5ecf728310",
Title ="Test", Mark = "afd",
Content ="sf",
Date = DateTime.Now,
ReadCount = 3,
Writer = "zuzhe",
TypeId = 5,
PartContent = "sdfds",
SubId = 2
},
new DETAILS{
Id = "1a33ed8f501b475dac40cc5ecf728311",
Title ="Test", Mark = "afd",
Content ="sf",
Date = DateTime.Now,
ReadCount = 3,
Writer = "zuzhe",
TypeId = 5,
PartContent = "sdfds",
SubId = 2
}
};
int count = db.Execute(sql, list); //多条数据添加
AjaxResult ajaxResult = new AjaxResult() { Code = "0", Msg = "OK", Data = count, Sum = count };
}
}
///
/// 单条语句更新
///
private static void Update()
{
using (var db = new SqlConnection(sqlconnStr))
{
string sql = "UPDATE [dbo].[TB_DETAILS] SET [MARK] = @MARK WHERE [ID] = @ID";
//匿名对象
var count = db.Execute(sql, new {
MARK= "张三", //参数占位符映射
ID = "1a33ed8f501b475dac40cc5ecf728305"
});
AjaxResult ajaxResult = new AjaxResult() { Code = "0", Msg = "OK", Data = count, Sum = count };
}
}
///
/// 键值对操作更新
///
private static void UpdateKeyVal()
{
using (var db = new SqlConnection(sqlconnStr))
{
string sql = "UPDATE [dbo].[TB_DETAILS] SET [MARK] = @MARK WHERE [ID] = @ID";
List> keys = new List>();
keys.Add(new KeyValuePair("@MARK","李四测试"));
keys.Add(new KeyValuePair("@ID", "1a33ed8f501b475dac40cc5ecf728305"));
///注意，键值对操作更新 会执行覆盖，以最后一组键值对更新
//keys.Add(new KeyValuePair("@MARK", "李四测试2"));
//keys.Add(new KeyValuePair("@ID", "1a33ed8f501b475dac40cc5ecf728306"));
var count = db.Execute(sql, keys);
AjaxResult ajaxResult = new AjaxResult() { Code = "0", Msg = "OK", Data = count, Sum = count };
}
}
///
/// 删除操作
///
private static void Delete()
{
using (var db = new SqlConnection(sqlconnStr))
{
string sql = "delete [dbo].[TB_DETAILS] where [ID] = @ID";
///匿名对象
var count = db.Execute(sql,new { Id= "sdfsd" });
AjaxResult ajaxResult = new AjaxResult() { Code = "0", Msg = "OK", Data = count, Sum = count };
}
}
///
/// 存储过程操作
///
private static void Proc()
{
using (var db = new SqlConnection(sqlconnStr))
{
string sql = "sp_details"; //存储过程名称
///匿名对象,使用存储过程时，查询显示指明存储过程操作
var deails = db.Query(sql,new { typeid = 2 },commandType: CommandType.StoredProcedure);
AjaxResult ajaxResult = new AjaxResult() { Code = "0", Msg = "OK", Data = deails, Sum = 0 };
//string jsonStr = JsonConvert.SerializeObject(ajaxResult);
Console.WriteLine($"{JsonConvert.SerializeObject(ajaxResult)}");
}
}
private static void Test()
{
using (var db = new SqlConnection(sqlconnStr))
{
//测试连接
}
}
}
public class AjaxResult
{
public string Code { get; set; }
public string Msg { get; set; }
public object Data { get; set; }
public int Sum { get; set; }
}
}