asp.net Oracle数据库访问操作类

using system;
using system.collections;
using system.collections.specialized;
using system.data;
using system.data.oracleclient;
using system.configuration;
using system.data.common;
using system.collections.generic;

    /// <summary>
    /// 数据访问抽象基础类
    ///
    /// </summary>
public class dbbase
{

    //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 = system.configuration.configurationmanager.connectionstrings["connectionstring1"].tostring();
    public dbbase()
    {
    }

    #region 检查用户名是否存在
    /// <summary>
    /// 检查用户名是否存在，存在返回true，不存在返回false
    /// </summary>
    /// <param name="strsql"></param>
    /// <returns></returns>
    public static bool exists(string strsql)
    {

        using (oracleconnection connection = new oracleconnection(connectionstring))
        {
            connection.open();
            oraclecommand mycmd = new oraclecommand(strsql, connection);
            try
            { 
                object obj = mycmd.executescalar(); //返回结果的第一行一列
                mycmd.parameters.clear();
                if ((object.equals(obj, null)) || (object.equals(obj, system.dbnull.value)))
                {
                    return false;
                }
                else
                {
                    return true;
                }          
            }
            catch (exception ex)
             {
                 throw ex;
             }
       }
    }

    #endregion

    #region  执行简单sql语句 返回影响的记录数

    /// <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)
    {

        oracleconnection connection = null;
        oraclecommand cmd = null;
        try
        {
            connection = new oracleconnection(connectionstring);
            cmd = new oraclecommand(sqlstring, connection);
            connection.open();
            int rows = cmd.executenonquery();
            return rows;
        }
        finally
        {
            if (cmd != null)
            {
                cmd.dispose();
            }
            if (connection != null)
            {
                connection.close();
                connection.dispose();
            }
        }
    }
       #endregion

 

    #region   执行查询语句，返回sqldatareader
    /// <summary>
    /// 执行查询语句，返回sqldatareader ( 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>sqldatareader</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 e;
        }
        finally
        {
            connection.close();

        }
    }
    #endregion

    #region  执行sql查询语句，返回datatable数据表
    /// <summary>
    /// 执行sql查询语句
    /// </summary>
    /// <param name="sqlstr"></param>
    /// <returns>返回datatable数据表</returns>
    public static datatable getdatatable(string sqlstr)
    {
        oracleconnection mycon = new oracleconnection(connectionstring);
        oraclecommand mycmd = new oraclecommand(sqlstr, mycon);
        datatable dt = new datatable();
        oracledataadapter da = null;
        try
        {
            mycon.open();
            da = new oracledataadapter(sqlstr, mycon);
            da.fill(dt);

        }
        catch (exception ex)
        {

            throw new exception(ex.tostring());
        }
        finally
        {
            mycon.close();
        }
        return dt;
    }
    #endregion

    #region 存储过程操作
    /// <summary>
    ///  运行存储过程,返回datatable;
    /// </summary>
    /// <param name="storedprocname">存储过程名称</param>
    /// <param name="parameters">参数</param>
    /// <returns></returns>
    public static datatable runproceduredatatable(string storedprocname, idataparameter[] parameters)
    {
        using (oracleconnection connection = new oracleconnection(connectionstring))
        {
            dataset ds = new dataset();
            connection.open();
            oracledataadapter sqlda = new oracledataadapter();
            sqlda.selectcommand = buildquerycommand(connection, storedprocname, parameters);
            sqlda.fill(ds);
            connection.close();
            return ds.tables[0];
        }
    }
    /// <summary>
    /// 执行存储过程
    /// </summary>
    /// <param name="storedprocname">存储过程名称</param>
    /// <param name="parameters">参数</param>
    /// <returns></returns>
    public static int runprocedure(string storedprocname, idataparameter[] parameters)
    {
        using (oracleconnection connection = new oracleconnection(connectionstring))
        {
            try
            {
                connection.open();
                oraclecommand command = new oraclecommand(storedprocname, connection);
                command.commandtype = commandtype.storedprocedure;
                foreach (oracleparameter parameter in parameters)
                {
                    if (parameter != null)
                    {
                        // 检查未分配值的输出参数,将其分配以dbnull.value.
                        if ((parameter.direction == parameterdirection.inputoutput || parameter.direction == parameterdirection.input) &&
                            (parameter.value == null))
                        {
                            parameter.value = dbnull.value;
                        }
                        command.parameters.add(parameter);
                    }
                }
               int rows = command.executenonquery();
               return rows;
            }

            finally
            {
                connection.close();
            }
        }
    }

    /// <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)
        {
            if (parameter != null)
            {
                // 检查未分配值的输出参数,将其分配以dbnull.value.
                if ((parameter.direction == parameterdirection.inputoutput || parameter.direction == parameterdirection.input) &&
                    (parameter.value == null))
                {
                    parameter.value = dbnull.value;
                }
                command.parameters.add(parameter);
            }
        }
        return command;
    }

    #endregion

    #region 事务处理

    /// <summary>
    /// 执行多条sql语句(list的形式)，实现数据库事务。
    /// </summary>
    /// <param name="sqlstringlist">多条sql语句</param>   
    /// 调用 transaction 对象的 commit 方法来完成事务，或调用 rollback 方法来取消事务。
    public static int executesqltran(list<string> sqlstringlist)
    {
        using (oracleconnection connection = new oracleconnection(connectionstring))
        {
            connection.open();
            // 为事务创建一个命令
            oraclecommand cmd = new oraclecommand();
            cmd.connection = connection;
            oracletransaction tx = connection.begintransaction();// 启动一个事务
            cmd.transaction = tx;
            try
            {
                int count = 0;
                for (int n = 0; n < sqlstringlist.count; n++)
                {
                    string strsql = sqlstringlist[n];
                    if (strsql.trim().length > 1)
                    {
                        cmd.commandtext = strsql;
                        count += cmd.executenonquery();
                    }
                }
                tx.commit();//用commit方法来完成事务
                return count;//
            }
            catch
            {
                tx.rollback();//出现错误，事务回滚！
                return 0;
            }
            finally
            {
                cmd.dispose();
                connection.close();//关闭连接
            }
        }
    }
    #endregion
    #region 事务处理

    /// <summary>
    /// 执行多条sql语句(字符串数组形式)，实现数据库事务。
    /// </summary>
    /// <param name="sqlstringlist">多条sql语句</param>   
    /// 调用 transaction 对象的 commit 方法来完成事务，或调用 rollback 方法来取消事务。
    public static int executetransaction(string[] sqlstringlist,int p)
    {
        using (oracleconnection connection = new oracleconnection(connectionstring))
        {
            connection.open();
            // 为事务创建一个命令
            oraclecommand cmd = new oraclecommand();
            cmd.connection = connection;
            oracletransaction tx = connection.begintransaction();// 启动一个事务
            cmd.transaction = tx;
            try
            {
                int count = 0;
                for (int n = 0; n < p; n++)
                {
                    string strsql = sqlstringlist[n];
                    if (strsql.trim().length > 1)
                    {
                        cmd.commandtext = strsql;
                        count += cmd.executenonquery();
                    }
                }
                tx.commit();//用commit方法来完成事务
                return count;//
            }
            catch
            {
                tx.rollback();//出现错误，事务回滚！
                return 0;
            }
            finally
            {
                cmd.dispose();
                connection.close();//关闭连接
            }
        }
    }

    #endregion
    /// <summary>
    /// 执行存储过程获取所需编号（各表主键）
    /// </summary>
    /// <param name="flowname">存储过程参数</param>
    /// <param name="steplen">存储过程参数（默认为1）</param>
    /// <returns>编号（各表主键）</returns>
    public static string get_flownum(string flowname, int steplen = 1)
    {
        oracleconnection mycon = new oracleconnection(connectionstring);
        try
        {
            mycon.open();
            oraclecommand mycommand = new oraclecommand("alarm_get_flownumber", mycon);
            mycommand.commandtype = commandtype.storedprocedure;
            mycommand.parameters.add(new oracleparameter("i_flowname", oracletype.varchar, 50));
            mycommand.parameters["i_flowname"].value = flowname;
            mycommand.parameters.add(new oracleparameter("i_seriesnum", oracletype.number));
            mycommand.parameters["i_seriesnum"].value = steplen;
            mycommand.parameters.add(new oracleparameter("o_flowvalue", oracletype.number));
            mycommand.parameters["o_flowvalue"].direction = parameterdirection.output;
            mycommand.executenonquery();
            return mycommand.parameters["o_flowvalue"].value.tostring();
        }
        catch
        {
            return "";
        }
        finally
        {
            mycon.close();
        }
    }

}