C# Oracle数据库操作类

 using System;
 using System.Data;
 using System.Collections.Generic;
 using System.Configuration;
 using System.Data.OracleClient;
 using System.Text;
 using System.IO;

 /// <summary>
 /// Oracle数据库操作类
 /// </summary>
 public static class OracleHelper
 {
     /// <summary>
     /// 执行数据库非查询操作,返回受影响的行数
     /// </summary>
     /// <param name="connectionString">数据库连接字符串</param>
     /// <param name="cmdType">命令的类型</param>
     /// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
     /// <param name="cmdParms">命令参数集合</param>
     /// <returns>当前查询操作影响的数据行数</returns>
     public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
     {
         OracleCommand cmd = new OracleCommand();
         using (OracleConnection conn = new OracleConnection(connectionString))
         {
             PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
             int val = cmd.ExecuteNonQuery();
             cmd.Parameters.Clear();
             return val;
         }
     }

     /// <summary>
     /// 执行数据库事务非查询操作,返回受影响的行数
     /// </summary>
     /// <param name="transaction">数据库事务对象</param>
     /// <param name="cmdType">Command类型</param>
     /// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
     /// <param name="cmdParms">命令参数集合</param>
     /// <returns>当前事务查询操作影响的数据行数</returns>
     public static int ExecuteNonQuery(OracleTransaction trans, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
     {
         OracleCommand cmd = new OracleCommand();
         PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, cmdParms);
         int val = cmd.ExecuteNonQuery();
         cmd.Parameters.Clear();
         return val;
     }

     /// <summary>
     /// 执行数据库非查询操作,返回受影响的行数
     /// </summary>
     /// <param name="connection">Oracle数据库连接对象</param>
     /// <param name="cmdType">Command类型</param>
     /// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
     /// <param name="cmdParms">命令参数集合</param>
     /// <returns>当前查询操作影响的数据行数</returns>
     public static int ExecuteNonQuery(OracleConnection connection, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
     {
         if (connection == null)
             throw new ArgumentNullException("当前数据库连接不存在");
         OracleCommand cmd = new OracleCommand();
         PrepareCommand(cmd, connection, null, cmdType, cmdText, cmdParms);
         int val = cmd.ExecuteNonQuery();
         cmd.Parameters.Clear();
         return val;
     }

     /// <summary>
     /// 执行数据库查询操作,返回OracleDataReader类型的内存结果集
     /// </summary>
     /// <param name="connectionString">数据库连接字符串</param>
     /// <param name="cmdType">命令的类型</param>
     /// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
     /// <param name="cmdParms">命令参数集合</param>
     /// <returns>当前查询操作返回的OracleDataReader类型的内存结果集</returns>
     public static OracleDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
     {
         OracleCommand cmd = new OracleCommand();
         OracleConnection conn = new OracleConnection(connectionString);
         try
         {
             PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
             OracleDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
             cmd.Parameters.Clear();
             return reader;
         }
         catch
         {
             cmd.Dispose();
             conn.Close();
             throw;
         }
     }

     /// <summary>
     /// 执行数据库查询操作,返回DataSet类型的结果集
     /// </summary>
     /// <param name="connectionString">数据库连接字符串</param>
     /// <param name="cmdType">命令的类型</param>
     /// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
     /// <param name="cmdParms">命令参数集合</param>
     /// <returns>当前查询操作返回的DataSet类型的结果集</returns>
     public static DataSet ExecuteDataSet(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
     {
         OracleCommand cmd = new OracleCommand();
         OracleConnection conn = new OracleConnection(connectionString);
         DataSet ds = null;
         try
         {
             PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
             OracleDataAdapter adapter = new OracleDataAdapter();
             adapter.SelectCommand = cmd;
             ds = new DataSet();
             adapter.Fill(ds);
             cmd.Parameters.Clear();
         }
         catch
         {
             throw;
         }
         finally
         {
             cmd.Dispose();
             conn.Close();
             conn.Dispose();
         }

         return ds;
     }

     /// <summary>
     /// 执行数据库查询操作,返回DataTable类型的结果集
     /// </summary>
     /// <param name="connectionString">数据库连接字符串</param>
     /// <param name="cmdType">命令的类型</param>
     /// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
     /// <param name="cmdParms">命令参数集合</param>
     /// <returns>当前查询操作返回的DataTable类型的结果集</returns>
     public static DataTable ExecuteDataTable(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
     {
         OracleCommand cmd = new OracleCommand();
         OracleConnection conn = new OracleConnection(connectionString);
         DataTable dt = null;

         try
         {
             PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
             OracleDataAdapter adapter = new OracleDataAdapter();
             adapter.SelectCommand = cmd;
             dt = new DataTable();
             adapter.Fill(dt);
             cmd.Parameters.Clear();
         }
         catch
         {
             throw;
         }
         finally
         {
             cmd.Dispose();
             conn.Close();
             conn.Dispose();
         }

         return dt;
     }

     /// <summary>
     /// 执行数据库查询操作,返回结果集中位于第一行第一列的Object类型的值
     /// </summary>
     /// <param name="connectionString">数据库连接字符串</param>
     /// <param name="cmdType">命令的类型</param>
     /// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
     /// <param name="cmdParms">命令参数集合</param>
     /// <returns>当前查询操作返回的结果集中位于第一行第一列的Object类型的值</returns>
     public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
     {
         OracleCommand cmd = new OracleCommand();
         OracleConnection conn = new OracleConnection(connectionString);
         object result = null;
         try
         {
             PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
             result = cmd.ExecuteScalar();
             cmd.Parameters.Clear();
         }
         catch
         {
             throw;
         }
         finally
         {
             cmd.Dispose();
             conn.Close();
             conn.Dispose();
         }

         return result;
     }

     ///    <summary>
     ///    执行数据库事务查询操作,返回结果集中位于第一行第一列的Object类型的值
     ///    </summary>
     ///    <param name="trans">一个已存在的数据库事务对象</param>
     ///    <param name="commandType">命令类型</param>
     ///    <param name="commandText">Oracle存储过程名称或PL/SQL命令</param>
     ///    <param name="cmdParms">命令参数集合</param>
     ///    <returns>当前事务查询操作返回的结果集中位于第一行第一列的Object类型的值</returns>
     public static object ExecuteScalar(OracleTransaction trans, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
     {
         if (trans == null)
             throw new ArgumentNullException("当前数据库事务不存在");
         OracleConnection conn = trans.Connection;
         if (conn == null)
             throw new ArgumentException("当前事务所在的数据库连接不存在");

         OracleCommand cmd = new OracleCommand();
         object result = null;

         try
         {
             PrepareCommand(cmd, conn, trans, cmdType, cmdText, cmdParms);
             result = cmd.ExecuteScalar();
             cmd.Parameters.Clear();
         }
         catch
         {
             throw;
         }
         finally
         {
             trans.Dispose();
             cmd.Dispose();
             conn.Close();
             conn.Dispose();
         }

         return result;
     }

     /// <summary>
     /// 执行数据库查询操作,返回结果集中位于第一行第一列的Object类型的值
     /// </summary>
     /// <param name="conn">数据库连接对象</param>
     /// <param name="cmdType">Command类型</param>
     /// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
     /// <param name="cmdParms">命令参数集合</param>
     /// <returns>当前查询操作返回的结果集中位于第一行第一列的Object类型的值</returns>
     public static object ExecuteScalar(OracleConnection conn, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
     {
         if (conn == null) throw new ArgumentException("当前数据库连接不存在");
         OracleCommand cmd = new OracleCommand();
         object result = null;

         try
         {
             PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
             result = cmd.ExecuteScalar();
             cmd.Parameters.Clear();
         }
         catch
         {
             throw;
         }
         finally
         {
             cmd.Dispose();
             conn.Close();
             conn.Dispose();
         }

         return result;
     }

     /// <summary>
     /// 执行数据库命令前的准备工作
     /// </summary>
     /// <param name="cmd">Command对象</param>
     /// <param name="conn">数据库连接对象</param>
     /// <param name="trans">事务对象</param>
     /// <param name="cmdType">Command类型</param>
     /// <param name="cmdText">Oracle存储过程名称或PL/SQL命令</param>
     /// <param name="cmdParms">命令参数集合</param>
     private static void PrepareCommand(OracleCommand cmd, OracleConnection conn, OracleTransaction trans, CommandType cmdType, 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 = cmdType;

         if (cmdParms != null)
         {
             foreach (OracleParameter parm in cmdParms)
                 cmd.Parameters.Add(parm);
         }
     }

     /// <summary>
     /// 将.NET日期时间类型转化为Oracle兼容的日期时间格式字符串
     /// </summary>
     /// <param name="date">.NET日期时间类型对象</param>
     /// <returns>Oracle兼容的日期时间格式字符串（如该字符串：TO_DATE('2007-12-1','YYYY-MM-DD')）</returns>
     public static string GetOracleDateFormat(DateTime date)
     {
         return "TO_DATE('" + date.ToString("yyyy-M-dd") + "','YYYY-MM-DD')";
     }

     /// <summary>
     /// 将.NET日期时间类型转化为Oracle兼容的日期格式字符串
     /// </summary>
     /// <param name="date">.NET日期时间类型对象</param>
     /// <param name="format">Oracle日期时间类型格式化限定符</param>
     /// <returns>Oracle兼容的日期时间格式字符串（如该字符串：TO_DATE('2007-12-1','YYYY-MM-DD')）</returns>
     public static string GetOracleDateFormat(DateTime date, string format)
     {
         if (format == null || format.Trim() == "") format = "YYYY-MM-DD";
         return "TO_DATE('" + date.ToString("yyyy-M-dd") + "','" + format + "')";
     }

     /// <summary>
     /// 将指定的关键字处理为模糊查询时的合法参数值
     /// </summary>
     /// <param name="source">待处理的查询关键字</param>
     /// <returns>过滤后的查询关键字</returns>
     public static string HandleLikeKey(string source)
     {
         if (source == null || source.Trim() == "") return null;

         source = source.Replace("[", "[]]");
         source = source.Replace("_", "[_]");
         source = source.Replace("%", "[%]");

         return ("%" + source + "%");
     }

 }