(轉)C# Oracle數據庫操作類

原文地址：http://www.cnblogs.com/haibing0107/p/6143922.html

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

/// <summary>  
/// Oracle數據庫操作類  
/// </summary>  
public static class OracleHelper
{
    /// <summary>  
    /// 執行數據庫非查詢操作,返回受影響的行數  
    /// </summary>  
    /// <param name="connectionString">數據庫連接字符串</param>
    /// <param name="cmdType">命令的類型</param>
    /// <param name="cmdText">Oracle存儲過程名稱或PL/SQL命令</param>  
    /// <param name="cmdParms">命令參數集合</param>  
    /// <returns>當前查詢操作影響的數據行數</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>  
    /// 執行數據庫事務非查詢操作,返回受影響的行數  
    /// </summary>  
    /// <param name="transaction">數據庫事務對象</param>  
    /// <param name="cmdType">Command類型</param>  
    /// <param name="cmdText">Oracle存儲過程名稱或PL/SQL命令</param>  
    /// <param name="cmdParms">命令參數集合</param>  
    /// <returns>當前事務查詢操作影響的數據行數</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>  
    /// 執行數據庫非查詢操作,返回受影響的行數  
    /// </summary>  
    /// <param name="connection">Oracle數據庫連接對象</param>  
    /// <param name="cmdType">Command類型</param>  
    /// <param name="cmdText">Oracle存儲過程名稱或PL/SQL命令</param>  
    /// <param name="cmdParms">命令參數集合</param>  
    /// <returns>當前查詢操作影響的數據行數</returns>  
    public static int ExecuteNonQuery(OracleConnection connection, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
    {
        if (connection == null)
            throw new ArgumentNullException("當前數據庫連接不存在");
        OracleCommand cmd = new OracleCommand();
        PrepareCommand(cmd, connection, null, cmdType, cmdText, cmdParms);
        int val = cmd.ExecuteNonQuery();
        cmd.Parameters.Clear();
        return val;
    }

    /// <summary>  
    /// 執行數據庫查詢操作,返回OracleDataReader類型的內存結果集  
    /// </summary>  
    /// <param name="connectionString">數據庫連接字符串</param>
    /// <param name="cmdType">命令的類型</param>
    /// <param name="cmdText">Oracle存儲過程名稱或PL/SQL命令</param>  
    /// <param name="cmdParms">命令參數集合</param>  
    /// <returns>當前查詢操作返回的OracleDataReader類型的內存結果集</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>  
    /// 執行數據庫查詢操作,返回DataSet類型的結果集  
    /// </summary>  
    /// <param name="connectionString">數據庫連接字符串</param>
    /// <param name="cmdType">命令的類型</param>
    /// <param name="cmdText">Oracle存儲過程名稱或PL/SQL命令</param>  
    /// <param name="cmdParms">命令參數集合</param>  
    /// <returns>當前查詢操作返回的DataSet類型的結果集</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>  
    /// 執行數據庫查詢操作,返回DataTable類型的結果集  
    /// </summary>  
    /// <param name="connectionString">數據庫連接字符串</param>
    /// <param name="cmdType">命令的類型</param>
    /// <param name="cmdText">Oracle存儲過程名稱或PL/SQL命令</param>  
    /// <param name="cmdParms">命令參數集合</param>  
    /// <returns>當前查詢操作返回的DataTable類型的結果集</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>  
    /// 執行數據庫查詢操作,返回結果集中位於第一行第一列的Object類型的值  
    /// </summary>  
    /// <param name="connectionString">數據庫連接字符串</param>
    /// <param name="cmdType">命令的類型</param>
    /// <param name="cmdText">Oracle存儲過程名稱或PL/SQL命令</param>  
    /// <param name="cmdParms">命令參數集合</param>  
    /// <returns>當前查詢操作返回的結果集中位於第一行第一列的Object類型的值</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>  
    ///    執行數據庫事務查詢操作,返回結果集中位於第一行第一列的Object類型的值  
    ///    </summary>  
    ///    <param name="trans">一個已存在的數據庫事務對象</param>  
    ///    <param name="commandType">命令類型</param>  
    ///    <param name="commandText">Oracle存儲過程名稱或PL/SQL命令</param>  
    ///    <param name="cmdParms">命令參數集合</param>  
    ///    <returns>當前事務查詢操作返回的結果集中位於第一行第一列的Object類型的值</returns>  
    public static object ExecuteScalar(OracleTransaction trans, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
    {
        if (trans == null)
            throw new ArgumentNullException("當前數據庫事務不存在");
        OracleConnection conn = trans.Connection;
        if (conn == null)
            throw new ArgumentException("當前事務所在的數據庫連接不存在");

        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>  
    /// 執行數據庫查詢操作,返回結果集中位於第一行第一列的Object類型的值  
    /// </summary>  
    /// <param name="conn">數據庫連接對象</param>  
    /// <param name="cmdType">Command類型</param>  
    /// <param name="cmdText">Oracle存儲過程名稱或PL/SQL命令</param>  
    /// <param name="cmdParms">命令參數集合</param>  
    /// <returns>當前查詢操作返回的結果集中位於第一行第一列的Object類型的值</returns>  
    public static object ExecuteScalar(OracleConnection conn, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
    {
        if (conn == null) throw new ArgumentException("當前數據庫連接不存在");
        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>  
    /// 執行數據庫命令前的准備工作  
    /// </summary>  
    /// <param name="cmd">Command對象</param>  
    /// <param name="conn">數據庫連接對象</param>  
    /// <param name="trans">事務對象</param>  
    /// <param name="cmdType">Command類型</param>  
    /// <param name="cmdText">Oracle存儲過程名稱或PL/SQL命令</param>  
    /// <param name="cmdParms">命令參數集合</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>  
    /// 將.NET日期時間類型轉化為Oracle兼容的日期時間格式字符串  
    /// </summary>  
    /// <param name="date">.NET日期時間類型對象</param>  
    /// <returns>Oracle兼容的日期時間格式字符串（如該字符串：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>  
    /// 將.NET日期時間類型轉化為Oracle兼容的日期格式字符串  
    /// </summary>  
    /// <param name="date">.NET日期時間類型對象</param>  
    /// <param name="format">Oracle日期時間類型格式化限定符</param>  
    /// <returns>Oracle兼容的日期時間格式字符串（如該字符串：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>  
    /// 將指定的關鍵字處理為模糊查詢時的合法參數值  
    /// </summary>  
    /// <param name="source">待處理的查詢關鍵字</param>  
    /// <returns>過濾后的查詢關鍵字</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 + "%");
    }

}