C# OracleHelper幫助類

原文：https://blog.csdn.net/easyboot/article/details/102608498

using System;

using System.Data;

using System.Configuration;

using System.Linq;

using System.Web;

using System.Xml.Linq;

using Oracle.ManagedDataAccess.Client;
 

public class OraDBHelper

{
    public static OracleCommand cmd = null;
    public static OracleConnection conn = null;
    public static string connstr = ConfigurationManager.ConnectionStrings["defaultNew"].ConnectionString;
    public OraDBHelper()
    { }
    #region 建立Oracle數據庫連接對象
    /// <returns>返回一個數據庫連接的OracleConnection對象</returns>   
    public static OracleConnection init()
    {
        try
        {
            conn = new OracleConnection(connstr);
            if (conn.State != ConnectionState.Open)
            {
                conn.Open();
            }
        }
        catch (Exception e)
        {
            throw new Exception(e.Message.ToString());
        }
        return conn;
    }
    #endregion
    #region 設置OracleCommand對象
    /// <param name="cmd">OracleCommand對象 </param>   
    /// <param name="cmdText">命令文本</param>   
    /// <param name="cmdType">命令類型</param>   
    /// <param name="cmdParms">參數集合</param>   
    private static void SetCommand(OracleCommand cmd, string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
    {
        cmd.Connection = conn;
        cmd.CommandText = cmdText;
        cmd.CommandType = cmdType;
        if (cmdParms != null)
        {
            cmd.Parameters.AddRange(cmdParms);
        }
    }
    #endregion
    #region 執行相應的Oracle sql語句，返回相應的DataSet對象
    /// <param name="sqlstr">sql語句</param>   
    /// <returns>返回相應的DataSet對象</returns>   
    public static DataSet GetDataSet(string sqlstr)
    {
        DataSet set = new DataSet();
        try
        {
            init();
            OracleDataAdapter adp = new OracleDataAdapter(sqlstr, conn);
            adp.Fill(set);
            conn.Close();
        }
        catch (Exception e)
        {
            throw new Exception(e.Message.ToString());
        }
        return set;
    }
    #endregion
    #region 執行sql語句，返回DataSet對象
    /// <param name="sqlstr">sql語句</param>   
    /// <param name="tableName">表名</param>   
    /// <returns>返回DataSet對象</returns>   
    public static DataSet GetDataSet(string sqlstr, string tableName)
    {
        DataSet set = new DataSet();
        try
        {
            init();
            OracleDataAdapter adp = new OracleDataAdapter(sqlstr, conn);
            adp.Fill(set, tableName);
            conn.Close();
        }
        catch (Exception e)
        {
            throw new Exception(e.Message.ToString());
        }
        return set;
    }
    #endregion
    #region 執行不帶參數的sql語句，返回受影響的行數
    /// <param name="cmdstr">增，刪，改sql語句</param>   
    /// <returns>返回受影響的行數</returns>   
    public static int ExecuteNonQuery(string cmdText)
    {
        int count;
        try
        {
            init();
            cmd = new OracleCommand(cmdText, conn);
            count = cmd.ExecuteNonQuery();
            conn.Close();
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message.ToString());
        }
        return count;
    }
    #endregion
    #region 執行帶參數的Oracle sql語句或存儲過程，返回行數
    /// <param name="cmdText">帶參數的sql語句和存儲過程名</param>   
    /// <param name="cmdType">命令類型</param>   
    /// <param name="cmdParms">參數集合</param>   
    /// <returns>返回受影響的行數</returns>   
    public static int ExecuteNonQuery(string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
    {
        int count;
        try
        {
            init();
            cmd = new OracleCommand();
            SetCommand(cmd, cmdText, cmdType, cmdParms);
            count = cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            conn.Close();
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message.ToString());
        }
        return count;
    }
    #endregion
    #region 執行不帶參數sql語句，返回一個從數據源讀取數據的OracleDataReader對象
    /// <param name="cmdstr">相應的sql語句</param>   
    /// <returns>返回一個從數據源讀取數據的OracleDataReader對象</returns>   
    public static OracleDataReader ExecuteReader(string cmdText)
    {
        OracleDataReader reader;
        try
        {
            init();
            cmd = new OracleCommand(cmdText, conn);
            reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message.ToString());
        }
        return reader;
    }
    #endregion
    #region 執行帶參數的sql語句或存儲過程，返回一個從數據源讀取數據的OracleDataReader對象
    /// <param name="cmdText">sql語句或存儲過程名</param>   
    /// <param name="cmdType">命令類型</param>   
    /// <param name="cmdParms">參數集合</param>   
    /// <returns>返回一個從數據源讀取數據的OracleDataReader對象</returns>   
    public static OracleDataReader ExecuteReader(string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
    {
        OracleDataReader reader;
        try
        {
            init();
            cmd = new OracleCommand();
            SetCommand(cmd, cmdText, cmdType, cmdParms);
            reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message.ToString());
        }
        return reader;
    }
    #endregion
    #region 執行不帶參數sql語句,返回結果集首行首列的值object
    /// <param name="cmdstr">相應的sql語句</param>   
    /// <returns>返回結果集首行首列的值object</returns>   
    public static object ExecuteScalar(string cmdText)
    {
        object obj;
        try
        {
            init();
            cmd = new OracleCommand(cmdText, conn);
            obj = cmd.ExecuteScalar();
            conn.Close();
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message.ToString());
        }
        return obj;
    }
    #endregion
    #region 執行帶參數sql語句或存儲過程,返回結果集首行首列的值object
    /// <param name="cmdText">sql語句或存儲過程名</param>   
    /// <param name="cmdType">命令類型</param>   
    /// <param name="cmdParms">返回結果集首行首列的值object</param>   
    /// <returns></returns>   
    public static object ExecuteScalar(string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
    {
        object obj;
        try
        {
            init();
            cmd = new OracleCommand();
            SetCommand(cmd, cmdText, cmdType, cmdParms);
            obj = cmd.ExecuteScalar();
            conn.Close();
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message.ToString());
        }
        return obj;
    }
    #endregion

}