一、安装插件
- Pomelo.EntityFrameworkCore.MySq (这里要选8.0.0以上版本低版本不支持.net8)
二、配置数据库连接串
appsettings.json 中配置数据库连接串
"ConnectionStrings": {
"Connection": "server=172.18.2.183;port=3306;database=students;uid=root;pwd=123456;CharSet=utf8"
}
三、添加实体类Student和数据库上下文
新建 Entities 目录,在,根据表及字段,在目录下新建 Student 实体类,在类上加 [Table("student")] 表名、属性上加[Column("id")] 字段名等与表对应,代码如下:
using System.ComponentModel.DataAnnotations.Schema;
namespace Snai.Mysql.Entities
{
[Table("students")]
public class Student
{
[Column("id")]
public int ID { get; set; }
[Column("name")]
public string Name { get; set; }
}
}
在根目录下加上 DataAccess 目录做为数据库操作目录,在该目录下加上 Base 目录做数据库上下文目录
在 Base 目录下新建 SqlContext 上下文类,继承 DbContext 类,通过构造函数注入数据库连接,添加 DbSet<Student> 实体属性,代码如下:
using Microsoft.EntityFrameworkCore;
using Snai.Mysql.Entities;
namespace Server.DataAccess.Base
{
public class SqlContext : DbContext
{
public SqlContext(DbContextOptions<SqlContext> options)
: base(options)
{ }
public DbSet<Student> Student { get; set; }
}
}
在DataAccess目录下创建Interface和Implement文件夹分别为数据库对应数据的接口和实现。
接口定义:
using Server.Mysql.Entities;
namespace Server.DataAccess.Interface
{
public interface IStudentDao
{
//插入数据
bool CreateStudent(Student student);
//取全部记录
IEnumerable<Student> GetStudents();
//取某id记录
Student GetStudentByID(int id);
//根据id更新整条记录
bool UpdateStudent(Student student);
//根据id更新名称
bool UpdateNameByID(int id, string name);
//根据id删掉记录
bool DeleteStudentByID(int id);
}
}
实现:
using Server.DataAccess.Base;
using Server.DataAccess.Interface;
using Server.Mysql.Entities;
namespace Server.DataAccess.Implement
{
public class StudentDao : IStudentDao
{
private SqlContext _context;
public StudentDao(SqlContext context)
{
_context = context;
}
//插入数据
public bool CreateStudent(Student student)
{
_context.Student.Add(student);
return _context.SaveChanges() > 0;
}
//取全部记录
public IEnumerable<Student> GetStudents()
{
return _context.Student.ToList();
}
//取某id记录
public Student? GetStudentByID(int id)
{
return _context.Student.SingleOrDefault(s => s.ID == id);
}
//根据id更新整条记录
public bool UpdateStudent(Student student)
{
_context.Student.Update(student);
return _context.SaveChanges() > 0;
}
//根据id更新名称
public bool UpdateNameByID(int id, string name)
{
var state = false;
var student = _context.Student.SingleOrDefault(s => s.ID == id);
if (student != null)
{
student.Name = name;
state = _context.SaveChanges() > 0;
}
return state;
}
//根据id删掉记录
public bool DeleteStudentByID(int id)
{
var student = _context.Student.SingleOrDefault(s => s.ID == id);
_context.Student.Remove(student);
return _context.SaveChanges() > 0;
}
}
}
依赖注入
在Program.cs中写入
string? sqlConnection = builder.Configuration.GetConnectionString("Connection");
if (sqlConnection != null)
{
builder.Services.AddDbContext<SqlContext>(options =>
{
var serverVersion = ServerVersion.AutoDetect(sqlConnection); //mysql版本: {8.2.0-mysql}
options.UseMySql(sqlConnection, serverVersion);
});
}
builder.Services.AddScoped<IStudentDao, StudentDao>(); //对于同一个请求返回同一个实例
设计表
Controller调用
private IStudentDao _iStudentDao;
public TestController(IStudentDao iStudentDao) //构造函数中添加
{
_iStudentDao = iStudentDao;
}
//调用测试方法创建
public void TestCreate()
{
Student student = new Student();
student.ID = 1;
student.Name = "在下没有钱";
_iStudentDao.CreateStudent(student);
}
运行结果:文章来源:https://www.toymoban.com/news/detail-834822.html
文章来源地址https://www.toymoban.com/news/detail-834822.html
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