(系列五).net8 中使用Dapper搭建底层仓储连接数据库(附源码)
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安装Dapper
1、在使用的地方,安装最新版Dapper。
2、在使用的地方,安装最新版的Microsoft.Extensions.Configuration
3、在使用的地方,安装最新版的Microsoft.Extensions.Configuration.Json
4、在使用的地方,安装最新版的System.Data.SqlClient
最终安装包如下:
创建数据库连接类
在创建数据库连接类之前,我们要先在appsettings.json中配置我们的数据库连接字符串。
SqlConnection": "Server=SQLOLEDB;Data Source=你的sqlServer名称;uid=你的数据库账号;pwd=你的数据库密码;DataBase=你的数据库名字如下图:
配置好数据库连接之后,我们需要一个读取数据库的类,所以我们需要在基础设施层(Infrastructure)创建。
创建文件夹DataBaseConnect然后在创建一个类DataBaseConnectConfig.cs。
内容如下:
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Configuration.Json;
using System.Data;
using System.Data.SqlClient;
namespace Infrastructure.DataBaseConnect
{
/// <summary>
/// 数据库连接类
/// </summary>
public static class DataBaseConnectConfig
{
/// <summary>
/// 声明静态连接
/// </summary>
public static IConfiguration Configuration { get; set; }
/// <summary>
/// 静态构造函数
/// </summary>
static DataBaseConnectConfig()
{
//ReloadOnChange = true 当appsettings.json被修改时重新加载
Configuration = new ConfigurationBuilder()
.Add(new JsonConfigurationSource { Path = "appsettings.json", ReloadOnChange = true })
.Build();
}
/// <summary>
/// 连接数据库
/// </summary>
/// <param name="sqlConnectionStr">连接数据库字符串</param>
/// <returns></returns>
public static SqlConnection GetSqlConnection(string? sqlConnectionStr = null)
{
if (string.IsNullOrWhiteSpace(sqlConnectionStr))
{
sqlConnectionStr = Configuration["ConnectionStrings:SqlConnection"];
}
var connection = new SqlConnection(sqlConnectionStr);
if (connection.State != ConnectionState.Open)
{
connection.Open();
}
return connection;
}
}
}GetSqlConnection方法会读取appsettings.json中的连接配置,并打开数据库。
创建仓储
有了数据库连接类后,我们就要开始着手搭建底层仓储,结构如下:
根据以上结构,我们分别创建IRepository.cs仓储接口和Repository.cs仓储接口的实现
IRepository.cs内容如下:
/// <summary>
/// 仓储接口定义
/// </summary>
public interface IRepository
{
}
/// <summary>
/// 定义泛型仓储接口
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <typeparam name="object">主键类型</typeparam>
public interface IRepository<T> : IRepository where T : class, new()
{
/// <summary>
/// 新增
/// </summary>
/// <param name="entity">实体</param>
/// <param name="innserSql">新增sql</param>
/// <returns></returns>
int Insert(T entity, string innserSql);
/// <summary>
/// 修改
/// </summary>
/// <param name="entity">实体</param>
/// <param name="updateSql">更新sql</param>
/// <returns></returns>
int Update(T entity, string updateSql);
/// <summary>
/// 删除
/// </summary>
/// <param name="deleteSql">删除sql</param>
/// <returns></returns>
int Delete(string key, string deleteSql);
/// <summary>
/// 根据主键获取模型
/// </summary>
/// <param name="key">主键</param>
/// <param name="selectSql">查询sql</param>
/// <returns></returns>
T GetByKey(string key, string selectSql);
/// <summary>
/// 获取所有数据
/// </summary>
/// <param name="selectAllSql">查询sql</param>
/// <returns></returns>
List<T> GetAll(string selectAllSql);
/// <summary>
/// 根据唯一主键验证数据是否存在
/// </summary>
/// <param name="id">主键</param>
/// <param name="selectSql">查询sql</param>
/// <returns>返回true存在,false不存在</returns>
bool IsExist(string id, string selectSql);说明1:该仓储接口是我们常用的crud(增删改查)的接口,它适用于所有的表结构,让我们不再重复的编写一样的sql语句。
说明2:该仓储接口可以自定义通用的接口,列如分页查询、批量新增、批量修改等。
Repository.cs结构如下
/// <summary>
/// 仓储基类
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <typeparam name="TPrimaryKey">主键类型</typeparam>
public abstract class Repository<T> : IRepository<T> where T : class, new()
{
/// <summary>
/// 删除
/// </summary>
/// <param name="deleteSql">删除sql</param>
/// <returns></returns>
public int Delete(string key, string deleteSql)
{
using var connection = DataBaseConnectConfig.GetSqlConnection();
return connection.Execute(deleteSql, new { Key = key });
}
/// <summary>
/// 根据主键获取模型
/// </summary>
/// <param name="id">主键</param>
/// <param name="selectSql">查询sql</param>
/// <returns></returns>
public T GetByKey(string id, string selectSql)
{
using var connection = DataBaseConnectConfig.GetSqlConnection();
return connection.QueryFirstOrDefault<T>(selectSql, new { Key = id });
}
/// <summary>
/// 获取所有数据
/// </summary>
/// <param name="selectAllSql">查询sql</param>
/// <returns></returns>
public List<T> GetAll(string selectAllSql)
{
using var connection = DataBaseConnectConfig.GetSqlConnection();
return connection.Query<T>(selectAllSql).ToList();
}
/// <summary>
/// 新增
/// </summary>
/// <param name="entity">新增实体</param>
/// <param name="innserSql">新增sql</param>
/// <returns></returns>
public int Insert(T entity, string innserSql)
{
using var connection = DataBaseConnectConfig.GetSqlConnection();
return connection.Execute(innserSql, entity);
}
/// <summary>
/// 根据唯一主键验证数据是否存在
/// </summary>
/// <param name="id">主键</param>
/// <param name="selectSql">查询sql</param>
/// <returns>返回true存在,false不存在</returns>
public bool IsExist(string id, string selectSql)
{
using var connection = DataBaseConnectConfig.GetSqlConnection();
var count = connection.QueryFirst<int>(selectSql, new { Key = id });
if (count > 0)
return true;
else
return false;
}
/// <summary>
/// 更新
/// </summary>
/// <param name="entity">更新实体</param>
/// <param name="updateSql">更新sql</param>
/// <returns></returns>
public int Update(T entity, string updateSql)
{
using var connection = DataBaseConnectConfig.GetSqlConnection();
return connection.Execute(updateSql, entity);
}
}该类是IRepository.cs仓储接口的实现,它继承于Repository.cs
创建基础sql仓储(可省略)
做完以上操作,我们的底层仓储事实上已经搭建完成,但博主搭建了一个基础sql的仓储,以便管理项目中所有基础的sql语句。
在Infrastructure的根目录创建一个BaseSqlRepository.cs的类。
编写sql的基础语句,现有语句如下。
/// <summary>
/// 创建继承sql仓储
/// </summary>
public class BaseSqlRepository
{
#region 表Sys_user
/// <summary>
/// sys_user新增
/// </summary>
public static string sysUser_insertSql = @"insert into Sys_User (UserName ,Password ,Age,Sex,IsOpen,DepartmentId,CreateTime,CreateUser) values(@UserName ,@Password ,@Age,@Sex,@IsOpen,@DepartmentId,@CreateTime,@CreateUser)";
/// <summary>
/// sys_user更新
/// </summary>
public static string sysUser_updateSql = @"update Sys_User set UserName=@UserName ,Password=@Password ,Age=@Age,Sex=@Sex,DepartmentId=@DepartmentId,CreateTime=@CreateTime,CreateUser=@CreateUser where UserId = @UserId";
/// <summary>
/// sys_user查询
/// </summary>
public static string sysUser_selectByKeySql = @" select * from Sys_User whereUserId=@Key";
/// <summary>
/// sys_user表查询全部语句
/// </summary>
public static string sysUser_selectAllSql = @" select * from Sys_User";
#endregion
}创建表Sys_User模型
结构如下:
/// <summary>
/// 用户表模型
/// </summary>
public class SysUser
{
/// <summary>
/// 用户id
/// </summary>
public int UserId { get; set; }
/// <summary>
/// 用户名
/// </summary>
public string UserName { get; set; }
/// <summary>
/// 密码
/// </summary>
public string Password { get; set; }
/// <summary>
/// 年龄
/// </summary>
public int Age { get; set; }
/// <summary>
/// 性别
/// </summary>
public int Sex { get; set; }
/// <summary>
/// 是否开启
/// </summary>
public bool IsOpen { get; set; }
/// <summary>
/// 部门id
/// </summary>
public int DepartmentId { get; set; }
/// <summary>
/// 创建时间
/// </summary>
public DateTime CreateTime { get; set; }
/// <summary>
/// 创建人员
/// </summary>
public string CreateUser { get; set; }
}该结构,同数据库表结构(一会说)
使用仓储
在之前的ISysUserRepository.cs和SysUserRepository.cs中分别继承IRepository.cs 和Repository.cs
/// <summary>
/// 用户服务仓储接口
/// </summary>
public interface ISysUserRepository : IRepository<SysUser>
{
/// <summary>
/// 测试Autofac
/// </summary>
/// <returns></returns>
string TestAutofac();
} /// <summary>
/// 用户服务仓储接口实现
/// </summary>
public class SysUserRepository : Repository<SysUser>, ISysUserRepository
{
/// <summary>
/// 测试Autofac
/// </summary>
/// <returns></returns>
public string TestAutofac()
{
return "Autofac使用成功";
}
}该用户仓储继承IRepository.cs 和Repository.cs之后,它就拥有了该仓储接口下的所有接口。
测试
做完以上工作,我们开始测试
首先,我们需要创建数据库(使用sqlServer数据库)和用户表
表结构和数据代码如下:
USE
GO
/****** Object:Table . Script Date: 2024/10/6 10:38:21 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE .(
IDENTITY(1,1) NOT NULL,
(50) NOT NULL,
(50) NOT NULL,
NULL,
NULL,
NOT NULL,
NULL,
NULL,
(50) NULL,
CONSTRAINT PRIMARY KEY CLUSTERED
(
ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON
) ON
GO
SET IDENTITY_INSERT . ON
INSERT . (, , , , , , , , ) VALUES (1, N'张三', N'1', 18, 1, 1, 1, CAST(N'2024-10-06T09:14:13.000' AS DateTime), N'1')
INSERT . (, , , , , , , , ) VALUES (2, N'李四', N'1', 19, 1, 1, 1, CAST(N'2024-10-06T09:15:08.000' AS DateTime), N'1')
SET IDENTITY_INSERT . OFF
ALTER TABLE . ADDDEFAULT ((0)) FOR
GO
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'用户名称' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Sys_User', @level2type=N'COLUMN',@level2name=N'UserName'
GO
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'用户密码' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Sys_User', @level2type=N'COLUMN',@level2name=N'Password'
GO
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'用户年龄' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Sys_User', @level2type=N'COLUMN',@level2name=N'Age'
GO
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'用户年龄 1:男 2:女' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Sys_User', @level2type=N'COLUMN',@level2name=N'Sex'
GO
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'部门id(表Department主键)' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Sys_User', @level2type=N'COLUMN',@level2name=N'DepartmentId'
GO
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'创建时间' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Sys_User', @level2type=N'COLUMN',@level2name=N'CreateTime'
GO
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'创建人员' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Sys_User', @level2type=N'COLUMN',@level2name=N'CreateUser'
GO
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'人员表' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Sys_User'
GO
服务层编写接口调用
说明:以下这些类,都在上一期中有说道,这里不再多说。
/// <summary>
/// 用户服务接口
/// </summary>
public interface ISysUserService
{
/// <summary>
/// 测试Autofac
/// </summary>
/// <returns></returns>
string TestAutofac();
/// <summary>
/// 查询所有用户
/// </summary>
/// <returns></returns>
List<SysUser> GetAllUser();
}/// <summary>
/// 用户服务接口实现
/// </summary>
public class SysUserService : ISysUserService
{
#region 构造实例化
private readonly ISysUserRepository _sysUserRepository;
public SysUserService(ISysUserRepository sysUserRepository)
{
_sysUserRepository = sysUserRepository;
}
#endregion
/// <summary>
/// 测试Autofac
/// </summary>
/// <returns></returns>
public string TestAutofac()
{
return _sysUserRepository.TestAutofac();
}
/// <summary>
/// 查询所有用户
/// </summary>
/// <returns></returns>
public List<SysUser> GetAllUser()
{
return _sysUserRepository.GetAll(BaseSqlRepository.sysUser_selectAllSql);
}
}在控制器(SysUserController)中添加如下接口
/// <summary>
/// 查询所有用户
/// </summary>
/// <returns></returns>
public List<SysUser> GetAllUser()
{
return _userService.GetAllUser();
}好了,启动项目,进行测试
可以看到,数据获取成功,到这里,我们使用Dapper搭建底层仓储连接数据库成功。
源代码地址:https://gitee.com/yangguangchenjie/overall-auth2.0-web-api
预览地址:http://139.155.137.144:8880/swagger/index.html
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