c#操作oracle的通用类

  修改整理的一个通用类,用来操作oracle数据库 十分的方便,支持直接操作sql语句和Hash表操作.现在修补MIS我都用这个类,节约了大量的代码与工作良!在老孙的指点下,偶将操作oracle,sql server ,access三种数据库的通用类集成在一起写了个数据抽象工厂,同时支持三种数据库无缝切换...以后整理出来.
using System;
using System.Data;
using System.Data.OracleClient;
using System.Collections;
using System.Reflection;
namespace MyOraComm
{
  /// <summary>
  /// ConnDbForOracle 的摘要说明。
  /// </summary>
  public class ConnForOracle
  {
   protected OracleConnection Connection;
   private string connectionString;
   public ConnForOracle()
   {
    string connStr;
    connStr = System.Configuration.ConfigurationSettings.AppSettings["connStr"].ToString();
    connectionString = connStr;
    Connection = new OracleConnection(connectionString);
   }
  
   #region 带参数的构造函数
   /// <summary>
   /// 带参数的构造函数
   /// </summary>
   /// <param name="ConnString">数据库联接字符串</param>
   public ConnForOracle(string ConnString)
   {
    string connStr;
    connStr = System.Configuration.ConfigurationSettings.AppSettings[ConnString].ToString();
    Connection = new OracleConnection(connStr);
   }
   #endregion
   #region 打开数据库
   /// <summary>
   /// 打开数据库
   /// </summary>
   public void  OpenConn()
   {
    if(this.Connection.State!=ConnectionState.Open)
     this.Connection.Open();
   }
   #endregion
   #region 关闭数据库联接
   /// <summary>
   /// 关闭数据库联接
   /// </summary>
   public void CloseConn()
   {
    if(Connection.State==ConnectionState.Open)
     Connection.Close();
   }
   #endregion
   #region 执行SQL语句，返回数据到DataSet中
   /// <summary>
   /// 执行SQL语句，返回数据到DataSet中
   /// </summary>
   /// <param name="sql">sql语句</param>
   /// <param name="DataSetName">自定义返回的DataSet表名</param>
   /// <returns>返回DataSet</returns>
   public DataSet ReturnDataSet(string sql,string DataSetName)
   {
    DataSet dataSet=new DataSet();
    OpenConn();
    OracleDataAdapter OraDA=new OracleDataAdapter(sql,Connection);
    OraDA.Fill(dataSet,DataSetName);
    //   CloseConn();
    return dataSet;
   }
   #endregion
   #region 执行Sql语句,返回带分页功能的dataset
   /// <summary>
   /// 执行Sql语句,返回带分页功能的dataset
   /// </summary>
   /// <param name="sql">Sql语句</param>
   /// <param name="PageSize">每页显示记录数</param>
   /// <param name="CurrPageIndex"><当前页/param>
   /// <param name="DataSetName">返回dataset表名</param>
   /// <returns>返回DataSet</returns>
   public DataSet ReturnDataSet(string sql,int PageSize,int CurrPageIndex,string DataSetName)
   {
    DataSet dataSet=new DataSet();
    OpenConn();
    OracleDataAdapter OraDA=new OracleDataAdapter(sql,Connection);
    OraDA.Fill(dataSet,PageSize * (CurrPageIndex - 1), PageSize,DataSetName);
    //   CloseConn();
    return dataSet;
   }
   #endregion
   #region 执行SQL语句，返回 DataReader,用之前一定要先.read()打开,然后才能读到数据
   /// <summary>
   /// 执行SQL语句，返回 DataReader,用之前一定要先.read()打开,然后才能读到数据
   /// </summary>
   /// <param name="sql">sql语句</param>
   /// <returns>返回一个OracleDataReader</returns>
   public OracleDataReader ReturnDataReader(String sql)
   {
    OpenConn();
    OracleCommand command = new OracleCommand(sql,Connection);
    return command.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
   }
   #endregion
   #region 执行SQL语句，返回记录总数数
   /// <summary>
   /// 执行SQL语句，返回记录总数数
   /// </summary>
   /// <param name="sql">sql语句</param>
   /// <returns>返回记录总条数</returns>
   public int GetRecordCount(string sql)
   {
    int recordCount = 0;
    OpenConn();
    OracleCommand command = new OracleCommand(sql,Connection);
    OracleDataReader dataReader = command.ExecuteReader();
    while(dataReader.Read())
    {
     recordCount++;
    }
    dataReader.Close();
    //   CloseConn();
    return recordCount;
   }
   #endregion
   #region 取当前序列,条件为seq.nextval或seq.currval
   /// <summary>
   /// 取当前序列
   /// </summary>
   /// <param name="seqstr"></param>
   /// <param name="table"></param>
   /// <returns></returns>
   public decimal GetSeq(string seqstr)
   {
    decimal seqnum = 0;
    string sql="select "+seqstr+" from dual";
    OpenConn();
    OracleCommand command = new OracleCommand(sql,Connection);
    OracleDataReader dataReader = command.ExecuteReader();
    if(dataReader.Read())
    {
     seqnum=decimal.Parse(dataReader[0].ToString());
    }
    dataReader.Close();
    //   CloseConn();
    return seqnum;
   }
   #endregion
   #region 执行SQL语句,返回所影响的行数
   /// <summary>
   /// 执行SQL语句,返回所影响的行数
   /// </summary>
   /// <param name="sql"></param>
   /// <returns></returns>
   public int  ExecuteSQL(string sql)
   {
    int Cmd=0;
    OpenConn();
    OracleCommand command = new OracleCommand(sql,Connection);
    try
    {
     Cmd =command.ExecuteNonQuery();
    }
    catch
    {
    
    }
    finally
    {
     //    CloseConn();
    }
    return Cmd;
   }
   #endregion
   //　＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
   //　＝＝用hashTable对数据库进行insert,update,del操作,注意此时只能用默认的数据库连接"connstr"＝＝
   //　＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
   #region 根据表名及哈稀表自动插入数据库 用法：Insert("test",ht)
   public int Insert(string TableName,Hashtable ht)
   {
    OracleParameter[] Parms=new OracleParameter[ht.Count];
    IDictionaryEnumerator et = ht.GetEnumerator();
    DataTable dt=GetTabType(TableName);
    System.Data.OracleClient.OracleType otype;
    int size=0;
    int i=0;
  
    while ( et.MoveNext() ) // 作哈希表循环
    {
     GetoType(et.Key.ToString().ToUpper(),dt,out otype,out size);
     System.Data.OracleClient.OracleParameter op=MakeParam(":"+et.Key.ToString(),otype,size,et.Value.ToString());
     Parms[i]=op; // 添加SqlParameter对象
     i=i+1;
    }
    string str_Sql=GetInsertSqlbyHt(TableName,ht); // 获得插入sql语句
    int val=ExecuteNonQuery(str_Sql,Parms);
    return val;
   }
   #endregion
  
   #region 根据相关条件对数据库进行更新操作 用法：Update("test","Id=:Id",ht);
   public int Update(string TableName,string ht_Where, Hashtable ht)
   {
    OracleParameter[] Parms=new OracleParameter[ht.Count];
    IDictionaryEnumerator et = ht.GetEnumerator();
    DataTable dt=GetTabType(TableName);
    System.Data.OracleClient.OracleType otype;
    int size=0;
    int i=0;
    // 作哈希表循环
    while ( et.MoveNext() )
    {
     GetoType(et.Key.ToString().ToUpper(),dt,out otype,out size);
     System.Data.OracleClient.OracleParameter op=MakeParam(":"+et.Key.ToString(),otype,size,et.Value.ToString());
     Parms[i]=op; // 添加SqlParameter对象
     i=i+1;
    }
    string str_Sql=GetUpdateSqlbyHt(TableName,ht_Where,ht); // 获得插入sql语句
    int val=ExecuteNonQuery(str_Sql,Parms);
    return val;
   }
   #endregion
  
   #region del操作,注意此处条件个数与hash里参数个数应该一致 用法：Del("test","Id=:Id",ht)
   public int Del(string TableName,string ht_Where,Hashtable ht)
   {
    OracleParameter[] Parms=new OracleParameter[ht.Count];
    IDictionaryEnumerator et = ht.GetEnumerator();
    DataTable dt=GetTabType(TableName);
    System.Data.OracleClient.OracleType otype;
    int i=0;
    int size=0;
    // 作哈希表循环
    while ( et.MoveNext() )
    {
     GetoType(et.Key.ToString().ToUpper(),dt,out otype,out size);
     System.Data.OracleClient.OracleParameter op=MakeParam(":"+et.Key.ToString(),et.Value.ToString());
     Parms[i]=op; // 添加SqlParameter对象
     i=i+1;
    }
    string str_Sql=GetDelSqlbyHt(TableName,ht_Where,ht); // 获得删除sql语句
    int val=ExecuteNonQuery(str_Sql,Parms);
    return val;
   }
   #endregion
   //　＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
   //　＝＝＝＝＝＝＝＝上面三个操作的内部调用函数＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
   //　＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
   #region 根据哈稀表及表名自动生成相应insert语句(参数类型的)
   /// <summary>
   /// 根据哈稀表及表名自动生成相应insert语句
   /// </summary>
   /// <param name="TableName">要插入的表名</param>
   /// <param name="ht">哈稀表</param>
   /// <returns>返回sql语句</returns>
   public static string GetInsertSqlbyHt(string TableName,Hashtable ht)
   {
    string str_Sql="";
    int i=0;
    int ht_Count=ht.Count; // 哈希表个数
    IDictionaryEnumerator myEnumerator = ht.GetEnumerator();
    string before="";
    string behide="";
    while ( myEnumerator.MoveNext() )
    {
     if (i==0)
     {
      before="("+myEnumerator.Key;
     }
     else if (i+1==ht_Count)
     {
      before=before+","+myEnumerator.Key+")";
     }
     else
     {
      before=before+","+myEnumerator.Key;
     }
     i=i+1;
    }
    behide=" Values"+before.Replace(",",",:").Replace("(","(:");
    str_Sql="Insert into "+TableName+before+behide;
    return str_Sql;
   }
   #endregion
   #region 根据表名，where条件，哈稀表自动生成更新语句(参数类型的)
   public static string GetUpdateSqlbyHt(string Table,string ht_Where,Hashtable ht)
   {
    string str_Sql="";
    int i=0;
    int ht_Count=ht.Count; // 哈希表个数
    IDictionaryEnumerator myEnumerator = ht.GetEnumerator();
    while ( myEnumerator.MoveNext() )
    {
     if (i==0)
     {
      if (ht_Where.ToString().ToLower().IndexOf((myEnumerator.Key+"=:"+myEnumerator.Key).ToLower())==-1)
      {
       str_Sql=myEnumerator.Key+"=:"+myEnumerator.Key;
      }
     }
     else
     {
      if (ht_Where.ToString().ToLower().IndexOf((":"+myEnumerator.Key+" ").ToLower())==-1)
      {
       str_Sql=str_Sql+","+myEnumerator.Key+"=:"+myEnumerator.Key;
      }
    
     }
     i=i+1;
    }
    if (ht_Where==null || ht_Where.Replace(" ","")=="")  // 更新时候没有条件
    {
     str_Sql="update "+Table+" set "+str_Sql;
    }
    else
    {
     str_Sql="update "+Table+" set "+str_Sql+" where "+ht_Where;
    }
    str_Sql=str_Sql.Replace("set ,","set ").Replace("update ,","update ");
    return str_Sql;
   }
   #endregion
   #region 根据表名，where条件，哈稀表自动生成del语句(参数类型的)
   public static string GetDelSqlbyHt(string Table,string ht_Where,Hashtable ht)
   {
    string str_Sql="";
    int i=0;
  
    int ht_Count=ht.Count; // 哈希表个数
    IDictionaryEnumerator myEnumerator = ht.GetEnumerator();
    while ( myEnumerator.MoveNext() )
    {
     if (i==0)
     {
      if (ht_Where.ToString().ToLower().IndexOf((myEnumerator.Key+"=:"+myEnumerator.Key).ToLower())==-1)
      {
       str_Sql=myEnumerator.Key+"=:"+myEnumerator.Key;
      }
     }
     else
     {
      if (ht_Where.ToString().ToLower().IndexOf((":"+myEnumerator.Key+" ").ToLower())==-1)
      {
       str_Sql=str_Sql+","+myEnumerator.Key+"=:"+myEnumerator.Key;
      }
    
     }
     i=i+1;
    }
    if (ht_Where==null || ht_Where.Replace(" ","")=="")  // 更新时候没有条件
    {
     str_Sql="Delete "+Table;
    }
    else
    {
     str_Sql="Delete "+Table+" where "+ht_Where;
    }
    return str_Sql;
   }
   #endregion
   #region 生成oracle参数
   /// <summary>
   /// 生成oracle参数
   /// </summary>
   /// <param name="ParamName">字段名</param>
   /// <param name="otype">数据类型</param>
   /// <param name="size">数据大小</param>
   /// <param name="Value">值</param>
   /// <returns></returns>
   public static OracleParameter MakeParam(string ParamName,System.Data.OracleClient.OracleType otype,int size,Object Value)
   {
    OracleParameter para=new OracleParameter(ParamName,Value);
    para.OracleType=otype;
    para.Size=size;
    return para;
   }
   #endregion
   #region 生成oracle参数
   public static OracleParameter MakeParam(string ParamName,string Value)
   {
    return new OracleParameter(ParamName, Value);
   }
   #endregion
   #region 根据表结构字段的类型和长度拼装oracle sql语句参数
   public static void GetoType(string key,DataTable dt,out System.Data.OracleClient.OracleType otype,out int size)
   {
    DataView dv=dt.DefaultView;
    dv.RowFilter="column_name='"+key+"'";
    string fType=dv[0]["data_type"].ToString().ToUpper();
    switch (fType)
    {
     case "DATE":
      otype= OracleType.DateTime;
      size=int.Parse(dv[0]["data_length"].ToString());
      break;
     case "CHAR":
      otype= OracleType.Char;
      size=int.Parse(dv[0]["data_length"].ToString());
      break;
     case "LONG":
      otype= OracleType.Double;
      size=int.Parse(dv[0]["data_length"].ToString());
      break;
     case "NVARCHAR2":
      otype= OracleType.NVarChar;
      size=int.Parse(dv[0]["data_length"].ToString());
      break;
     case "VARCHAR2":
      otype= OracleType.NVarChar;
      size=int.Parse(dv[0]["data_length"].ToString());
      break;
     default:
      otype= OracleType.NVarChar;
      size=100;
      break;
    }
   }
   #endregion
   #region动态 取表里字段的类型和长度,此处没有动态用到connstr,是默认的！by/文少
   public System.Data.DataTable GetTabType(string tabnale)
   {
    string sql="select  column_name,data_type,data_length from all_tab_columns where table_name='"+tabnale.ToUpper()+"'";
    OpenConn();
    return (ReturnDataSet(sql,"dv")).Tables[0];
  
   }
   #endregion
   #region 执行sql语句
   public int ExecuteNonQuery(string cmdText, params OracleParameter[] cmdParms)
   {
  
    OracleCommand cmd = new OracleCommand();
    OpenConn();  
    cmd.Connection=Connection;
    cmd.CommandText = cmdText;
    if (cmdParms != null)
    {
     foreach (OracleParameter parm in cmdParms)
      cmd.Parameters.Add(parm);
    }
    int val = cmd.ExecuteNonQuery();
    cmd.Parameters.Clear();
    //   conn.CloseConn();
    return val;
   }
   #endregion
   //　＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
   //　＝＝＝＝＝＝＝＝＝内部调用函数完＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
   //　＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
  }
}