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最新推荐文章于 2024-04-29 20:54:44 发布

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最新推荐文章于 2024-04-29 20:54:44 发布 · 1.2k 阅读

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这篇博客介绍了C#中数据访问层（DAL）的基础实现，包括DALBase类，用于处理数据库操作如检查记录是否存在、添加记录。内容涵盖数据库连接、事务管理以及数据查询方法。此外，还展示了如何通过BLLBase类来获取Dal实例并进行业务逻辑处理。

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test notes:

IDAL/DALBase.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Data;
using System.Data.OleDb;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace IDAL
{
public class DALBase<T> : MarshalByRefObject
{
private IPersistBroker _persistBroker;

public DALBase()
{
this._persistBroker = PersistBrokerManager.PersistBroker("");
}

/// <summary>
/// 数据库连接
/// </summary>
protected IPersistBroker PersistBroker
{
get
{
return _persistBroker;
}
}

/// <summary>
/// 检查记录是否存在
/// </summary>
/// <returns>true：记录存在， false：记录不存在</returns>
public virtual bool IsExist(DomainObject obj )
{
PropertyInfo[] properties = obj.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public);

if (properties.Length <= 0)
{
return false;
}
string _field = string.Empty;
string wstr = string.Empty;
foreach (PropertyInfo item in properties)
{
string name = item.Name.Replace("_PK", "");
object value = item.GetValue(obj, null);
if (item.Name.IndexOf("_PK") > -1)
{
wstr += " " + name.Replace("_PK", "") + "='" + (value == null ? "" : value.ToString()) + "' and";
}
_field += name + ",";
}
_field = _field.TrimEnd(new char[] { ',' });
wstr = wstr.Remove(wstr.Length - 3, 3);
string tbname = "TBL" + obj.GetType().Name;
string sqlText = string.Format("SELECT {0} FROM {1} WHERE {2} ", _field, tbname, wstr);
DataSet ds = null;
ds = this.PersistBroker.Query(sqlText);
if (ds != null && ds.Tables[0].Rows.Count > 0)
{
return true;
}
return false;
}

public bool AddDomainObject(DomainObject obj)
{
try
{
try
{
DBDateTime dbDateTime = GetNowDBDateTime();
DateTime workDateTime = FormatHelper.ToDateTime(dbDateTime.DBDate, dbDateTime.DBTime);

PropertyInfo[] properties = obj.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public);
foreach (PropertyInfo item in properties)