sqlaccess.cs

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

namespace eOA
{
	/// <summary>
	/// SqlAccess 的摘要说明。
	/// </summary>
	public abstract class SqlAccess
	{
		public SqlAccess()
		{

		}
		//获得数据库连接字符串CONN_STRING
		public static readonly string CONN_STRING = ConfigurationSettings.AppSettings["ConnectionString"];
		public static string UserName;
		public static string UserRole;

		public static int ExecuteNonQuery(string connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms) 
		{

			SqlCommand cmd = new SqlCommand();

			using (SqlConnection conn = new SqlConnection(connString)) 
			{
				PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
				int val = cmd.ExecuteNonQuery();
				//清除cmd的参数
				cmd.Parameters.Clear();
				return val;
			}
		}

		public static int ExecuteNonQuery(SqlConnection conn, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms) 
		{

			SqlCommand cmd = new SqlCommand();

			PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
			int val = cmd.ExecuteNonQuery();
			cmd.Parameters.Clear();
			return val;
		}

		public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms) 
		{
			SqlCommand cmd = new SqlCommand();
			PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, cmdParms);
			int val = cmd.ExecuteNonQuery();
			cmd.Parameters.Clear();
			return val;
		}

		
		public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
		{
			return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);
		}

		public static SqlDataReader ExecuteReader(string connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms) 
		{
			SqlCommand cmd = new SqlCommand();
			SqlConnection conn = new SqlConnection(connString);

			try 
			{
				PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
				SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
				cmd.Parameters.Clear();
				return rdr;
			}
			catch 
			{
				conn.Close();
				throw;
			}
		}
		

		public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
		{
			return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);
		}

		public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			using (SqlConnection cn = new SqlConnection(connectionString))
			{
				cn.Open();

				//调用重载方法
				return ExecuteDataset(cn, commandType, commandText, commandParameters);
			}
		}

		//		public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
		//		{
		//			return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);
		//		}
		
		public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			//创建一个SqlCommand对象，并对其进行初始化
			SqlCommand cmd = new SqlCommand();
			PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);
			
			//创建SqlDataAdapter对象以及DataSet
			SqlDataAdapter da = new SqlDataAdapter(cmd);
			DataSet ds = new DataSet();

			//填充ds
			da.Fill(ds);
			
			// 清除cmd的参数集合	
			cmd.Parameters.Clear();
			
			//返回ds
			return ds;						
		}
		
		
		public static object ExecuteScalar(string connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms) 
		{
			SqlCommand cmd = new SqlCommand();

			using (SqlConnection conn = new SqlConnection(connString)) 
			{
				PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
				//执行查询，并返回查询所返回的结果集中第一行的第一列。
				object val = cmd.ExecuteScalar();
				cmd.Parameters.Clear();
				return val;
			}
		}

		public static object ExecuteScalar(SqlConnection conn, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms) 
		{
			
			SqlCommand cmd = new SqlCommand();

			PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
			object val = cmd.ExecuteScalar();
			cmd.Parameters.Clear();
			return val;
		}


		private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms) 
		{
			//判断连接的状态。如果是关闭状态，则打开
			if (conn.State != ConnectionState.Open)
				conn.Open();
			//cmd属性赋值
			cmd.Connection = conn;
			cmd.CommandText = cmdText;
			//是否需要用到事务处理
			if (trans != null)
				cmd.Transaction = trans;
				
			cmd.CommandType = cmdType;
			//添加cmd需要的存储过程参数
			if (cmdParms != null) 
			{
				foreach (SqlParameter parm in cmdParms)
					cmd.Parameters.Add(parm);
			}
		}
	}
}