C#DbHelperOra,Oracle数据库帮助类 ，转载

主要功能如下

数据访问抽象基础类 主要是访问Oracle数据库主要实现如下功能

    1.数据访问基础类(基于Oracle)，主要是用来访问Oracle数据库的。
    2.得到最大值；是否存在；是否存在（基于OracleParameter ）；
    3.执行SQL语句，返回影响的记录数;
    4.执行多条SQL语句，实现数据库事务;
    5.执行带一个存储过程参数的的SQL语句;
    6.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);
    7.执行一条计算查询结果语句，返回查询结果（object）;
    8.执行查询语句，返回OracleDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close );
    9.执行查询语句，返回DataSet;
    10.执行SQL语句，返回影响的记录数;
    11.执行多条SQL语句，实现数据库事务;
    12.执行一条计算查询结果语句，返回查询结果（object）;
    13.执行查询语句，返回OracleDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close );
    14.执行查询语句，返回DataSet;
    15.执行存储过程 返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close );
    16.执行存储过程;构建 OracleCommand 对象(用来返回一个结果集，而不是一个整数值);
    17.执行存储过程，返回影响的行数;
    18.创建 OracleCommand 对象实例(用来返回一个整数值)

/// <summary>
/// 编 码 人：苏飞
/// 联系方式：361983679  
/// 更新网站：[url=http://www.sufeinet.com/thread-655-1-1.html]http://www.sufeinet.com/thread-655-1-1.html[/url]
/// </summary>
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.OracleClient;
using System.Configuration;
 
namespace Maticsoft.DBUtility
{
  /// <summary>
  /// 数据访问基础类(基于Oracle)
  /// 可以用户可以修改满足自己项目的需要。
  /// </summary>
  public abstract class DbHelperOra
  {
        //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.    
        public static string connectionString = "连接字符串"; 
    public DbHelperOra()
    {      
    }
 
        #region 公用方法
         
        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)
        {
            object obj = GetSingle(strSql);
            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;
            }
        }
 
        public static bool Exists(string strSql, params OracleParameter[] 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;
            }
        }
        
        #endregion
 
     
    #region  执行简单SQL语句
 
    /// <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 (OracleConnection connection = new OracleConnection(connectionString))
      {        
        using (OracleCommand cmd = new OracleCommand(SQLString,connection))
        {
          try
          {    
            connection.Open();
            int rows=cmd.ExecuteNonQuery();
            return rows;
          }
          catch(System.Data.OracleClient.OracleException 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 (OracleConnection conn = new OracleConnection(connectionString))
      {
        conn.Open();
        OracleCommand cmd = new OracleCommand();
        cmd.Connection=conn;        
        OracleTransaction 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.OracleClient.OracleException 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 (OracleConnection connection = new OracleConnection(connectionString))
      {
        OracleCommand cmd = new OracleCommand(SQLString,connection);
                System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@content", OracleType.NVarChar);
        myParameter.Value = content ;
        cmd.Parameters.Add(myParameter);
        try
        {
          connection.Open();
          int rows=cmd.ExecuteNonQuery();
          return rows;
        }
        catch(System.Data.OracleClient.OracleException 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 (OracleConnection connection = new OracleConnection(connectionString))
      {
        OracleCommand cmd = new OracleCommand(strSQL,connection);
                System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@fs", OracleType.LongRaw);
        myParameter.Value = fs ;
        cmd.Parameters.Add(myParameter);
        try
        {
          connection.Open();
          int rows=cmd.ExecuteNonQuery();
          return rows;
        }
        catch(System.Data.OracleClient.OracleException 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 (OracleConnection connection = new OracleConnection(connectionString))
      {
        using(OracleCommand cmd = new OracleCommand(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.OracleClient.OracleException e)
          {            
            connection.Close();
            throw new Exception(e.Message);
          }  
        }
      }
    }
    /// <summary>
        /// 执行查询语句，返回OracleDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
    /// </summary>
    /// <param name="strSQL">查询语句</param>
    /// <returns>OracleDataReader</returns>
    public static OracleDataReader ExecuteReader(string strSQL)
    {
      OracleConnection connection = new OracleConnection(connectionString);      
      OracleCommand cmd = new OracleCommand(strSQL,connection);        
      try
      {
        connection.Open();
                OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
        return myReader;
      }
      catch(System.Data.OracleClient.OracleException 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 (OracleConnection connection = new OracleConnection(connectionString))
      {
        DataSet ds = new DataSet();
        try
        {
          connection.Open();
          OracleDataAdapter command = new OracleDataAdapter(SQLString,connection);        
          command.Fill(ds,"ds");
        }
        catch(System.Data.OracleClient.OracleException 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
    /// </summary>
    /// <param name="SQLString">SQL语句</param>
    /// <returns>影响的记录数</returns>
    public static int ExecuteSql(string SQLString,params OracleParameter[] cmdParms)
    {
      using (OracleConnection connection = new OracleConnection(connectionString))
      {        
        using (OracleCommand cmd = new OracleCommand())
        {
          try
          {    
            PrepareCommand(cmd, connection, null,SQLString, cmdParms);
            int rows=cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            return rows;
          }
          catch(System.Data.OracleClient.OracleException E)
          {        
            throw new Exception(E.Message);
          }
        }        
      }
    }
     
       
    /// <summary>
    /// 执行多条SQL语句，实现数据库事务。
    /// </summary>
    /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的OracleParameter[]）</param>
    public static void ExecuteSqlTran(Hashtable SQLStringList)
    {      
      using (OracleConnection conn = new OracleConnection(connectionString))
      {
        conn.Open();
        using (OracleTransaction trans = conn.BeginTransaction()) 
        {
          OracleCommand cmd = new OracleCommand();
          try
          {
            //循环
            foreach (DictionaryEntry myDE in SQLStringList)
            {  
              string   cmdText=myDE.Key.ToString();
              OracleParameter[] cmdParms=(OracleParameter[])myDE.Value;
              PrepareCommand(cmd,conn,trans,cmdText, cmdParms);
              int val = cmd.ExecuteNonQuery();
              cmd.Parameters.Clear();
 
              trans.Commit();
            }          
          }
          catch
          {
            trans.Rollback();
            throw;
          }
        }        
      }
    }
   
         
    /// <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,params OracleParameter[] cmdParms)
    {
      using (OracleConnection connection = new OracleConnection(connectionString))
      {
        using (OracleCommand cmd = new OracleCommand())
        {
          try
          {
            PrepareCommand(cmd, connection, null,SQLString, cmdParms);
            object obj = cmd.ExecuteScalar();
            cmd.Parameters.Clear();
            if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))
            {          
              return null;
            }
            else
            {
              return obj;
            }        
          }
          catch(System.Data.OracleClient.OracleException e)
          {        
            throw new Exception(e.Message);
          }          
        }
      }
    }
     
    /// <summary>
        /// 执行查询语句，返回OracleDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
    /// </summary>
    /// <param name="strSQL">查询语句</param>
    /// <returns>OracleDataReader</returns>
    public static OracleDataReader ExecuteReader(string SQLString,params OracleParameter[] cmdParms)
    {    
      OracleConnection connection = new OracleConnection(connectionString);
      OracleCommand cmd = new OracleCommand();        
      try
      {
        PrepareCommand(cmd, connection, null,SQLString, cmdParms);
                OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
        cmd.Parameters.Clear();
        return myReader;
      }
      catch(System.Data.OracleClient.OracleException 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,params OracleParameter[] cmdParms)
    {
      using (OracleConnection connection = new OracleConnection(connectionString))
      {
        OracleCommand cmd = new OracleCommand();
        PrepareCommand(cmd, connection, null,SQLString, cmdParms);
        using( OracleDataAdapter da = new OracleDataAdapter(cmd) )
        {
          DataSet ds = new DataSet();  
          try
          {                        
            da.Fill(ds,"ds");
            cmd.Parameters.Clear();
          }
          catch(System.Data.OracleClient.OracleException ex)
          {        
            throw new Exception(ex.Message);
          }      
          return ds;
        }        
      }      
    }
 
 
    private static void PrepareCommand(OracleCommand cmd,OracleConnection conn,OracleTransaction trans, string cmdText, OracleParameter[] cmdParms) 
    {
      if (conn.State != ConnectionState.Open)
        conn.Open();
      cmd.Connection = conn;
      cmd.CommandText = cmdText;
      if (trans != null)
        cmd.Transaction = trans;
      cmd.CommandType = CommandType.Text;//cmdType;
      if (cmdParms != null) 
      {
        foreach (OracleParameter parm in cmdParms)
          cmd.Parameters.Add(parm);
      }
    }
 
    #endregion
 
    #region 存储过程操作
 
    /// <summary>
        /// 执行存储过程 返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
    /// </summary>
    /// <param name="storedProcName">存储过程名</param>
    /// <param name="parameters">存储过程参数</param>
    /// <returns>OracleDataReader</returns>
    public static OracleDataReader RunProcedure(string storedProcName, IDataParameter[] parameters )
    {
      OracleConnection connection = new OracleConnection(connectionString);
      OracleDataReader returnReader;
      connection.Open();
      OracleCommand command = BuildQueryCommand( connection,storedProcName, parameters );
      command.CommandType = CommandType.StoredProcedure;
            returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);        
      return returnReader;      
    }
     
     
    /// <summary>
    /// 执行存储过程
    /// </summary>
    /// <param name="storedProcName">存储过程名</param>
    /// <param name="parameters">存储过程参数</param>
    /// <param name="tableName">DataSet结果中的表名</param>
    /// <returns>DataSet</returns>
    public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName )
    {
      using (OracleConnection connection = new OracleConnection(connectionString))
      {
        DataSet dataSet = new DataSet();
        connection.Open();
        OracleDataAdapter sqlDA = new OracleDataAdapter();
        sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters );
        sqlDA.Fill( dataSet, tableName );
        connection.Close();
        return dataSet;
      }
    }
 
     
    /// <summary>
    /// 构建 OracleCommand 对象(用来返回一个结果集，而不是一个整数值)
    /// </summary>
    /// <param name="connection">数据库连接</param>
    /// <param name="storedProcName">存储过程名</param>
    /// <param name="parameters">存储过程参数</param>
    /// <returns>OracleCommand</returns>
    private static OracleCommand BuildQueryCommand(OracleConnection connection,string storedProcName, IDataParameter[] parameters)
    {      
      OracleCommand command = new OracleCommand( storedProcName, connection );
      command.CommandType = CommandType.StoredProcedure;
      foreach (OracleParameter parameter in parameters)
      {
        command.Parameters.Add( parameter );
      }
      return command;      
    }
     
    /// <summary>
    /// 执行存储过程，返回影响的行数    
    /// </summary>
    /// <param name="storedProcName">存储过程名</param>
    /// <param name="parameters">存储过程参数</param>
    /// <param name="rowsAffected">影响的行数</param>
    /// <returns></returns>
    public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected )
    {
      using (OracleConnection connection = new OracleConnection(connectionString))
      {
        int result;
        connection.Open();
        OracleCommand command = BuildIntCommand(connection,storedProcName, parameters );
        rowsAffected = command.ExecuteNonQuery();
        result = (int)command.Parameters["ReturnValue"].Value;
        //Connection.Close();
        return result;
      }
    }
     
    /// <summary>
    /// 创建 OracleCommand 对象实例(用来返回一个整数值)  
    /// </summary>
    /// <param name="storedProcName">存储过程名</param>
    /// <param name="parameters">存储过程参数</param>
    /// <returns>OracleCommand 对象实例</returns>
    private static OracleCommand BuildIntCommand(OracleConnection connection,string storedProcName, IDataParameter[] parameters)
    {
      OracleCommand command = BuildQueryCommand(connection,storedProcName, parameters );
      command.Parameters.Add( new OracleParameter ( "ReturnValue",
                OracleType.Int32, 4, ParameterDirection.ReturnValue,
        false,0,0,string.Empty,DataRowVersion.Default,null ));
      return command;
    }
    #endregion  
  }
}