dbhelpersql.cs

主要实现软件的基本架构

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace sp.SQLServerDAL //可以修改成实际项目的命名空间名称
{
	/// <summary>
	/// Copyright (C) 2004-2008 LiTianPing 
	/// 数据访问基础类(基于SQLServer)
	/// 用户可以修改满足自己项目的需要。
	/// </summary>
	public abstract class DbHelperSQL
	{
		//数据库连接字符串(web.config来配置)
		//<add key="ConnectionString" value="server=127.0.0.1;database=DATABASE;uid=sa;pwd=" />		
		protected static string connectionString = ConfigurationManager.AppSettings["sqlstring"];
		public DbHelperSQL()
		{			
		}
		
		#region  执行简单SQL语句
		public static int GetMaxID(string FieldName,string TableName)
		{
			string strsql = "select max(" + FieldName + ")+1 from " + TableName;
			object obj = GetSingle(strsql);
			if (obj == null)
			{
				return 1;
			}
			else
			{
				return int.Parse(obj.ToString());
			}
		}
	
		public static bool Exists(string strSql, params SqlParameter[] cmdParms)
		{
			object obj = GetSingle(strSql, cmdParms);
			int cmdresult;
			if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
			{
				cmdresult = 0;
			}
			else
			{
				cmdresult = int.Parse(obj.ToString());
			}
			if (cmdresult == 0)
			{
				return false;
			}
			else
			{
				return true;
			}
		}
		/// <summary>
		/// 执行SQL语句，返回影响的记录数
		/// </summary>
		/// <param name="SQLString">SQL语句</param>
		/// <returns>影响的记录数</returns>
		public static int ExecuteSql(string SQLString)
		{
			using (SqlConnection connection = new SqlConnection(connectionString))
			{				
				using (SqlCommand cmd = new SqlCommand(SQLString,connection))
				{
					try
					{		
						connection.Open();
						int rows=cmd.ExecuteNonQuery();
						return rows;
					}
					catch(System.Data.SqlClient.SqlException E)
					{					
						connection.Close();
						throw new Exception(E.Message);
					}
				}				
			}
		}
		
		/// <summary>
		/// 执行多条SQL语句，实现数据库事务。
		/// </summary>
		/// <param name="SQLStringList">多条SQL语句</param>		
		public static void ExecuteSqlTran(ArrayList SQLStringList)
		{
			using (SqlConnection conn = new SqlConnection(connectionString))
			{
				conn.Open();
				SqlCommand cmd = new SqlCommand();
				cmd.Connection=conn;				
				SqlTransaction tx=conn.BeginTransaction();			
				cmd.Transaction=tx;				
				try
				{   		
					for(int n=0;n<SQLStringList.Count;n++)
					{
						string strsql=SQLStringList[n].ToString();
						if (strsql.Trim().Length>1)
						{
							cmd.CommandText=strsql;
							cmd.ExecuteNonQuery();
						}
					}										
					tx.Commit();					
				}
				catch(System.Data.SqlClient.SqlException E)
				{		
					tx.Rollback();
					throw new Exception(E.Message);
				}
			}
		}
		/// <summary>
		/// 执行带一个存储过程参数的的SQL语句。
		/// </summary>
		/// <param name="SQLString">SQL语句</param>
		/// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
		/// <returns>影响的记录数</returns>
		public static int ExecuteSql(string SQLString,string content)
		{				
			using (SqlConnection connection = new SqlConnection(connectionString))
			{
				SqlCommand cmd = new SqlCommand(SQLString,connection);		
				System.Data.SqlClient.SqlParameter  myParameter = new System.Data.SqlClient.SqlParameter ( "@content", SqlDbType.NText);
				myParameter.Value = content ;
				cmd.Parameters.Add(myParameter);
				try
				{
					connection.Open();
					int rows=cmd.ExecuteNonQuery();
					return rows;
				}
				catch(System.Data.SqlClient.SqlException E)
				{				
					throw new Exception(E.Message);
				}
				finally
				{
					cmd.Dispose();
					connection.Close();
				}	
			}
		}		
		/// <summary>
		/// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
		/// </summary>
		/// <param name="strSQL">SQL语句</param>
		/// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
		/// <returns>影响的记录数</returns>
		public static int ExecuteSqlInsertImg(string strSQL,byte[] fs)
		{		
			using (SqlConnection connection = new SqlConnection(connectionString))
			{
				SqlCommand cmd = new SqlCommand(strSQL,connection);	
				System.Data.SqlClient.SqlParameter  myParameter = new System.Data.SqlClient.SqlParameter ( "@fs", SqlDbType.Image);
				myParameter.Value = fs ;
				cmd.Parameters.Add(myParameter);
				try
				{
					connection.Open();
					int rows=cmd.ExecuteNonQuery();
					return rows;
				}
				catch(System.Data.SqlClient.SqlException E)
				{				
					throw new Exception(E.Message);
				}
				finally
				{
					cmd.Dispose();
					connection.Close();
				}				
			}
		}
		
		/// <summary>
		/// 执行一条计算查询结果语句，返回查询结果（object）。
		/// </summary>
		/// <param name="SQLString">计算查询结果语句</param>
		/// <returns>查询结果（object）</returns>
		public static object GetSingle(string SQLString)
		{
			using (SqlConnection connection = new SqlConnection(connectionString))
			{
				using(SqlCommand cmd = new SqlCommand(SQLString,connection))
				{
					try
					{
						connection.Open();
						object obj = cmd.ExecuteScalar();
						if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))
						{					
							return null;
						}
						else
						{
							return obj;
						}				
					}
					catch(System.Data.SqlClient.SqlException e)
					{						
						connection.Close();
						throw new Exception(e.Message);
					}	
				}
			}
		}
		/// <summary>
		/// 执行查询语句，返回SqlDataReader
		/// </summary>
		/// <param name="strSQL">查询语句</param>
		/// <returns>SqlDataReader</returns>
		public static SqlDataReader ExecuteReader(string strSQL)
		{
			SqlConnection connection = new SqlConnection(connectionString);			
			SqlCommand cmd = new SqlCommand(strSQL,connection);				
			try
			{
				connection.Open();	
				SqlDataReader myReader = cmd.ExecuteReader();
				return myReader;
			}
			catch(System.Data.SqlClient.SqlException e)
			{								
				throw new Exception(e.Message);
			}			
			
		}		
		/// <summary>
		/// 执行查询语句，返回DataSet
		/// </summary>
		/// <param name="SQLString">查询语句</param>
		/// <returns>DataSet</returns>
		public static DataSet Query(string SQLString)
		{
			using (SqlConnection connection = new SqlConnection(connectionString))
			{
				DataSet ds = new DataSet();
				try
				{
					connection.Open();
					SqlDataAdapter command = new SqlDataAdapter(SQLString,connection);				
					command.Fill(ds,"ds");
				}
				catch(System.Data.SqlClient.SqlException ex)
				{				
					throw new Exception(ex.Message);
				}			
				return ds;
			}			
		}


		#endregion

		#region 执行带参数的SQL语句

		/// <summary>
		/// 执行SQL语句，返回影响的记录数