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  • 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  
      }
    }
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  • 原文地址:https://www.cnblogs.com/lizeyan/p/3628138.html
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