让C#开发更简单,抽象增删改 / iVAN

相信经常做一些MS，CRM
项目的童鞋非常有体会，大部分时间都是在复制和粘贴，大部分项目框架都是建一个三层，首先是DAL建一些增删改查，然后呢是BLL业务层再建一些增删改
查，然后UI层再调用增删改查，整个过程非常的繁琐，开发效率并不是很高，这种项目做久了之后，就非常的痛苦，非常的无聊。今天我给大家带来一个抽象出增
删改查的框架，相信有些大牛早就总结出来了，不喜勿喷哈，本人旨在分享。

你再也不用写增删改查了，我给你抽象出来了！！

现在业界火了一种ORM
框架，那就是Dapper，我也是Dapper的粉丝之一，而我总结出来的框架也是基于Daaper。下面是我的代码，首先是Dapper
Helper类，数据库通用访问类（用Nuget工具先把Dapper类引用到NetUtility.Dapper.Core项目中去）：

NetUtility.Dapper.Core.DataBaseAccess.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Dapper;
using System.Data;
using NetUtility.Entity;
using System.Reflection;
namespace NetUtility.Dapper.Core
{
/// <summary>
/// 数据库访问类
/// </summary>
public class DataBaseAccess
{
public static SqlConnection CreateConnection()
{
string connStr = ConfigurationManager.ConnectionStrings["connString"].ConnectionString;
SqlConnection conn = new SqlConnection(connStr);
conn.Open();
return conn;
}
/// <summary>
/// 执行增、删、改方法
/// </summary>
/// <param name="sql"></param>
/// <param name="parms"></param>
/// <returns></returns>
public static int Execute(string sql, object parms = null)
{
using (IDbConnection conn = CreateConnection())
{
return conn.Execute(sql,parms);
}
}
/// <summary>
/// 得到单行单列
/// </summary>
/// <param name="sql"></param>
/// <param name="parms"></param>
/// <returns></returns>
public static object ExecuteScalar(string sql, object parms = null)
{
using (IDbConnection conn = CreateConnection())
{
return conn.ExecuteScalar(sql, parms);
}
}
/// <summary>
/// 单个数据集查询
/// </summary>
/// <param name="sql"></param>
/// <param name="parms"></param>
/// <returns></returns>
public static List<TEntity> Query<TEntity>(string sql,Func<TEntity,bool> pre ,object parms = null)
{
using (IDbConnection conn = CreateConnection())
{
return conn.Query<TEntity>(sql, parms).Where(pre).ToList();
}
}
/// <summary>
/// 单个数据集查询
/// </summary>
/// <param name="sql"></param>
/// <param name="parms"></param>
/// <returns></returns>
public static List<TEntity> Query<TEntity>(string sql, object parms = null)
{
using (IDbConnection conn = CreateConnection())
{
return conn.Query<TEntity>(sql, parms).ToList();
}
}
/// <summary>
/// 多个数据集查询
/// </summary>
/// <param name="sql"></param>
/// <param name="parms"></param>
/// <returns></returns>
public static SqlMapper.GridReader MultyQuery(string sql, object parms = null)
{
using (IDbConnection conn = CreateConnection())
{
return conn.QueryMultiple(sql, parms);
}
}
/// <summary>
/// 单个数据集查询
/// </summary>
/// <param name="sql"></param>
/// <param name="parms"></param>
/// <returns></returns>
public static TEntity FirstOrDefault<TEntity>(string sql,Func<TEntity,bool> selector, object parms = null)
{
using (IDbConnection conn = CreateConnection())
{
return conn.Query<TEntity>(sql, parms).Where(selector).FirstOrDefault();
}
}
}
}

我把增删改查抽象出来了，少不了的就是SQL语句的生成，生成SQL语句，要么是映射，要么是反射，而我用的是反射，给一个Entity类，我读取他所有属性和字段，然后生成对应的SQL语句。 NetUtility.Dapper.Core.DataMapping.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
namespace NetUtility.Dapper.Core
{
internal class DataMapping<TModel> where TModel : class
{
#region 数据库类型+DataBaseType
/// <summary>
/// 数据库类型
/// </summary>
public static string DataBaseType
{
get
{
string strType = ConfigurationManager.AppSettings["DataBaseType"];
if (!string.IsNullOrEmpty(strType))
{
return strType;
}
else
{
return string.Empty;
}
}
}
#endregion
#region 主键属性字段+PrimaryKey
/// <summary>
/// 主键字段名称
/// </summary>
public static string PrimaryKey
{
get
{
Type t = typeof(TModel);
TableInfoAttribute tableInfo = t.GetCustomAttribute(typeof(TableInfoAttribute), true) as TableInfoAttribute;
if (tableInfo!=null)//如果没有标识表信息特性，则通过表名向数据库中得到主键信息
{
return tableInfo.PrimaryKey;
}
else
{
string tableName = TableName();
return DataBaseAccess.ExecuteScalar("SELECT name FROM SysColumns WHERE id=Object_Id('" + tableName + "') and colid=(select top 1 colid from sysindexkeys where id=Object_Id('" + tableName + "'))").ToString();
}
}
}
#endregion
#region 获取表名+TableName
/// <summary>
/// 获取表名
/// </summary>
/// <param name="prev">数据库表名前缀</param>
/// <returns></returns>
public static string TableName(string prev = "")
{
Type t = typeof(TModel);
TableInfoAttribute tableInfo = t.GetCustomAttribute(typeof(TableInfoAttribute), true) as TableInfoAttribute;
return tableInfo != null ? tableInfo.TableName : string.Concat(prev, t.Name);
}
#endregion
#region Select 查询语句+GetQuerySql
/// <summary>
/// Select 查询语句
/// </summary>
/// <returns></returns>
public static string GetQuerySql()
{
StringBuilder sql = new StringBuilder("select * from ");
sql.Append(TableName());
return sql.ToString();
}
#endregion
#region Insert非Null属性的对象实例 Sql 语句+GetInsertSql
/// <summary>
/// Insert 非Null属性的对象实例 Sql 语句
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
public static string GetInsertSql(TModel model)
{
StringBuilder sql = new StringBuilder("insert into ");
string[] props = Propertys(model);
sql.Append(TableName());
sql.Append("(");
sql.Append(string.Join(",", props));
sql.Append(") values(@");
sql.Append(string.Join(",@", props));
sql.Append(");select @@IDENTITY");
return sql.ToString();
}
#endregion
#region Delete Sql 语句+GetDeleteSql
/// <summary>
/// Delete Sql 语句
/// </summary>
/// <returns></returns>
public static string GetDeleteSql()
{
return string.Format(@"delete from {0} where {1} in @IdList", TableName(), PrimaryKey);
}
#endregion
#region Update 非Null属性的对象实例 Sql语句+GetUpdateSql
/// <summary>
/// Update 非Null属性的对象实例 Sql语句
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
public static string GetUpdateSql(TModel model)
{
StringBuilder sql = new StringBuilder("update ");
string[] props = Propertys(model);
sql.Append(TableName());
sql.Append(" set ");
foreach (string propName in props)
{
sql.Append(propName + "=@" + propName + ",");
}
sql.Remove(sql.Length - 1, 1);
sql.Append(" where " + PrimaryKey + "=@Id");
return sql.ToString();
}
#endregion
#region 非主键且非Null属性集合+Propertys
/// <summary>
/// 非主键且非Null属性
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
public static string[] Propertys(TModel model)
{
PropertyInfo[] props = typeof(TModel).GetProperties();
List<string> list = new List<string>();
string key = PrimaryKey;
if (props != null && props.Length > 0)
{
foreach (PropertyInfo prop in props)
{
if (prop.GetValue(model, null) != null && !prop.Name.Equals(key, StringComparison.OrdinalIgnoreCase))
{
list.Add(prop.Name);
}
}
}
return list.ToArray();
}
#endregion
}
}

代码中的TableInfoAttribute 类是我建一个属性特性类，用于标识表名和主键名称的特性类，假如Entity实体类上面没有标识主键名称，框架默认会用Entity类名作为表名，建议最好标识一下表名和主键名称。

NetUtility.Dapper.Core.TableInfoAttribute.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace NetUtility.Dapper.Core
{
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Property, AllowMultiple = true, Inherited = true)]
/// <summary>
/// 标识表名、主键等信息特性类
/// </summary>
public class TableInfoAttribute : Attribute
{
/// <summary>
/// 数据库表名
/// </summary>
public string TableName { get; set; }
/// <summary>
/// 主键名称
/// </summary>
public string PrimaryKey { get; set; }
public TableInfoAttribute()
{ }
public TableInfoAttribute(string tableName, string key)
{
this.TableName = tableName;
this.PrimaryKey = key;
}
}
}using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace NetUtility.Dapper.Core
{
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Property, AllowMultiple = true, Inherited = true)]
/// <summary>
/// 标识表名、主键等信息特性类
/// </summary>
public class TableInfoAttribute : Attribute
{
/// <summary>
/// 数据库表名
/// </summary>
public string TableName { get; set; }
/// <summary>
/// 主键名称
/// </summary>
public string PrimaryKey { get; set; }
public TableInfoAttribute()
{ }
public TableInfoAttribute(string tableName, string key)
{
this.TableName = tableName;
this.PrimaryKey = key;
}
}
}

好，下面就是新建一个抽象类，用于抽象出增删改查的 ExecuteSql<TModel> 泛型抽象类

NetUtility.Dapper.Core.ExecuteSql.cs

using Dapper;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace NetUtility.Dapper.Core
{
public abstract class ExecuteSql<TModel> where TModel : class
{
#region Insert非Null属性的对象实例+Insert(TModel model)
/// <summary>
/// Insert非Null属性的对象实例
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
public virtual int Insert(TModel model)
{
string sql = DataMapping<TModel>.GetInsertSql(model);
object res = DataBaseAccess.ExecuteScalar(sql, model);
if (res != null)
{
return Convert.ToInt32(res);
}
return 0;
}
#endregion
#region Select * 查询+Query()
/// <summary>
/// Select * 查询
/// </summary>
/// <returns></returns>
public virtual List<TModel> Query()
{
string sql = DataMapping<TModel>.GetQuerySql();
return DataBaseAccess.Query<TModel>(sql);
}
#endregion
#region 带查询条件的Select查询+Query(Func<TModel, bool> selector)
/// <summary>
/// 带查询条件的Select查询
/// </summary>
/// <param name="selector"></param>
/// <returns></returns>
public virtual List<TModel> Query(Func<TModel, bool> selector)
{
string sql = DataMapping<TModel>.GetQuerySql();
return DataBaseAccess.Query<TModel>(sql, selector);
}
#endregion
#region 得到一个对象的实例+FirstOrDefault(Func<TModel, bool> selector = null)
/// <summary>
/// 得到一个对象的实例
/// </summary>
/// <param name="selector"></param>
/// <returns></returns>
public virtual TModel FirstOrDefault(Func<TModel, bool> selector = null)
{
string sql = DataMapping<TModel>.GetQuerySql();
return DataBaseAccess.FirstOrDefault<TModel>(sql, selector);
}
#endregion
#region 批量删除+Delete(string[] IdList)
/// <summary>
/// 批量删除
/// </summary>
/// <param name="IdList"></param>
/// <returns></returns>
public virtual int Delete(string[] IdList)
{
return DataBaseAccess.Execute(DataMapping<TModel>.GetDeleteSql(), new { IdList = IdList });
}
#endregion
#region Update 一个非Null属性的对象+Update(TModel model)
/// <summary>
/// Update 一个非Null属性的对象
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
public virtual int Update(TModel model)
{
return DataBaseAccess.Execute(DataMapping<TModel>.GetUpdateSql(model), model);
}
#endregion
#region 获取多个数据集+MultyQuery(string sql, object param = null)
/// <summary>
/// 获取多个数据集
/// </summary>
/// <param name="sql"></param>
/// <param name="param"></param>
/// <returns></returns>
public virtual SqlMapper.GridReader MultyQuery(string sql, object param = null)
{
return DataBaseAccess.MultyQuery(sql, param);
}
#endregion
}
}

ExecuteSql.cs 类中的方法全是
virsual方法，使用者可以重写他，特别是查询方法，一定会被重写掉。现在NetUtility.Dapper.Core项目中的类全部写完了，现在
是我业务类的引用了，我现在只需要建一个业务类继承这个抽象类，这些增删改查方法全都有了，已经不需要写了！

下面是我的两个实体类，实体类用TableInfoAttribute特性类标识出了主键名称和表名称：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NetUtility.Dapper.Core;
namespace NetUtility.Entity
{
[TableInfo(PrimaryKey ="Id",TableName ="Classes")]
public class Classes
{ public int Id { get; set; }
public string Name { get; set; }
public string Code { get; set; }
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NetUtility.Dapper.Core;
namespace NetUtility.Entity
{
[TableInfo(PrimaryKey = "Id", TableName = "Student")]
public class Student
{
public int Id { get; set; }
public string Name { get; set; }
public string Code { get; set; }
public int? Age { get; set; }
public DateTime? JoinDate { get; set; }
public int? ClassesId { get; set; }
}
}

我再新建一个StudentRepertories业务类，继承ExecuteSql抽象类。

NetUtility.Repertories.StudentRepertories.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NetUtility.Dapper.Core;
using NetUtility.Entity;
using NetUtility.Entity.ExstendEntity;//这个是实体类的扩展类，项目中如不需要可移除
using System.Data;
using Dapper;
namespace NetUtility.Repertories
{
public class StudentRepertories : ExecuteSql<Student>
{
public override List<Student> Query()
{
return base.Query();
}
public List<StudentInfo> QueryInfo()
{
string sql = "select * from Student a left join Classes b on a.ClassesId=b.Id";
using (IDbConnection conn = DataBaseAccess.CreateConnection())
{
return conn.Query<StudentInfo, Classes, StudentInfo>(sql, (stu, classes) => { stu.ClassesModel = classes; return stu; }).ToList();
}
}
}
}

好了，现在我们只需要建一个控制台测试一下有没有问题就是了，亲测，木有问题。

NetUtility.ConsoleItem

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NetUtility.Repertories;
using NetUtility.Entity;
namespace NetUtility.ConsoleItem
{
class Program
{
static void Main(string[] args)
{
//业务对象
StudentRepertories stu = new StudentRepertories();
//实体对象
var model = new Student(){Age = 100,ClassesId = 1,Code = "3200020021",JoinDate = DateTime.Now,Name = "老徐"};
//新增一个对象
int StudentId = stu.Insert(model);
var newModel = stu.FirstOrDefault(a => a.Id == StudentId);
//Lambda表达式查询
var list = stu.Query(a => a.Age == 100);
//不带参数查询
var studentInfoList = stu.QueryInfo();
#region 更新
newModel.Code = "1111111111";
newModel.Id = StudentId;
stu.Update(newModel);
#endregion
// 删除
stu.Delete(new string[] { newModel.Id.ToString() });
Console.ReadKey();
}
}
}

各位可以指出我上面的程序一些毛病，相互交流一下，或者有什么更新的做法也可以说说

来源：51CTO

时间： 2024-09-19 09:10:46

让C#开发更简单,抽象增删改

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