Dapper的应用

Posted 2021-02-16

dapper开发效率极快so easy

using Dapper;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;

namespace WcfServiceTest
{
/// <summary>
/// Dapper案例
/// </summary>
public class StudentDB
{
//获取web.config里的连接字符串
public static string connectionString = System.Configuration.ConfigurationManager.AppSettings["connectstring"];

/// <summary>
/// 查询指定数据
/// </summary>
/// <param name="person"></param>
/// <returns></returns>
public static List<Student> Query(string name)
{
using (IDbConnection connection = new SqlConnection(connectionString))
{
string strsql = "select * from Student where 1=1 ";
if (!string.IsNullOrEmpty(name))
{
strsql += "and Name like ‘%@Name%‘";
}
return connection.Query<Student>(strsql, name).ToList();
}
}

/// <summary>
/// 反填
/// </summary>
/// <param name="id"></param>
/// <returns></returns>
public static Student QueryById(int id)
{
using (IDbConnection connection = new SqlConnection(connectionString))
{
return connection.Query<Student>("select * from Student where [email protected]", id).SingleOrDefault();
}
}

/// <summary>
/// 新增
/// </summary>
/// <param name="student"></param>
/// <returns></returns>
public static int Insert(Student student)
{
using (IDbConnection connection = new SqlConnection(connectionString))
{
return connection.Execute("insert into Student(Name,Age) values(@Name,@Age)", student);
}
}

public static int Update(Student student)
{
using (IDbConnection connection = new SqlConnection(connectionString))
{
return connection.Execute("update Studentset Name = @Name,Age= @Age where [email protected]", student);
}
}

/// <summary>
/// 删除
/// </summary>
/// <param name="student"></param>
/// <returns></returns>
public static int Delete(int Id)
{
using (IDbConnection connection = new SqlConnection(connectionString))
{
return connection.Execute("delete from Student where [email protected]", Id);
}
}

/// <summary>
/// 批量删除
/// </summary>
/// <param name="students"></param>
/// <returns></returns>
public static int Delete(List<Student> students)
{
using (IDbConnection connection = new SqlConnection(connectionString))
{
return connection.Execute("delete from Student where [email protected]", students);
}
}

}
}