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asp.net动软生成的DbHelperOra

原作者: [db:作者] 来自: [db:来源] 收藏 邀请
 

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

namespace Jc.DAL
{
 /// <summary>
    /// Copyright (C) Maticsoft
 /// 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 =ConfigurationManager.ConnectionStrings["JcConn"].ToString();    
  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 

 }
}


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