asp.net 动软生成的DbHelperOra

using System;

using System.Collections;

using System.Collections.Specialized;

using System.Data;

using System.Data.OracleClient;

using System.Configuration;

namespace Jc.DAL

{

/// <summary>

/// Copyright (C) Maticsoft

/// 数据访问基础类(基于Oracle)

/// 可以用户可以修改满足自己项目的需要。

/// </summary>

public abstract class DbHelperOra

{

//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 =ConfigurationManager.ConnectionStrings["JcConn"].ToString();

public DbHelperOra()

{

}

#region 公用方法

public static int GetMaxID(string FieldName, string TableName)

{

string strsql = "select max(" + FieldName + ")+1 from " + TableName;

object obj = GetSingle(strsql);

if (obj == null)

{

return 1;

}

else

{

return int.Parse(obj.ToString());

}

}

public static bool Exists(string strSql)

{

object obj = GetSingle(strSql);

int cmdresult;

if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))

{

cmdresult = 0;

}

else

{

cmdresult = int.Parse(obj.ToString());

}

if (cmdresult == 0)

{

return false;

}

else

{

return true;

}

}

public static bool Exists(string strSql, params OracleParameter[] cmdParms)

{

object obj = GetSingle(strSql, cmdParms);

int cmdresult;

if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))

{

cmdresult = 0;

}

else

{

cmdresult = int.Parse(obj.ToString());

}

if (cmdresult == 0)

{

return false;

}

else

{

return true;

}

}

#endregion

#region 执行简单SQL语句

/// <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)

{

using (OracleConnection connection = new OracleConnection(connectionString))

{

using (OracleCommand cmd = new OracleCommand(SQLString,connection))

{

try

{

connection.Open();

int rows=cmd.ExecuteNonQuery();

return rows;

}

catch(System.Data.OracleClient.OracleException E)

{

connection.Close();

throw new Exception(E.Message);

}

}

}

}

/// <summary>

/// 执行多条SQL语句，实现数据库事务。

/// </summary>

/// <param name="SQLStringList">多条SQL语句</param>

public static void ExecuteSqlTran(ArrayList SQLStringList)

{

using (OracleConnection conn = new OracleConnection(connectionString))

{

conn.Open();

OracleCommand cmd = new OracleCommand();

cmd.Connection=conn;

OracleTransaction tx=conn.BeginTransaction();

cmd.Transaction=tx;

try

{

for(int n=0;n<SQLStringList.Count;n++)

{

string strsql=SQLStringList[n].ToString();

if (strsql.Trim().Length>1)

{

cmd.CommandText=strsql;

cmd.ExecuteNonQuery();

}

}

tx.Commit();

}

catch(System.Data.OracleClient.OracleException E)

{

tx.Rollback();

throw new Exception(E.Message);

}

}

}

/// <summary>

/// 执行带一个存储过程参数的的SQL语句。

/// </summary>

/// <param name="SQLString">SQL语句</param>

/// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>

/// <returns>影响的记录数</returns>

public static int ExecuteSql(string SQLString,string content)

{

using (OracleConnection connection = new OracleConnection(connectionString))

{

OracleCommand cmd = new OracleCommand(SQLString,connection);

System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@content", OracleType.NVarChar);

myParameter.Value = content ;

cmd.Parameters.Add(myParameter);

try

{

connection.Open();

int rows=cmd.ExecuteNonQuery();

return rows;

}

catch(System.Data.OracleClient.OracleException E)

{

throw new Exception(E.Message);

}

finally

{

cmd.Dispose();

connection.Close();

}

}

}

/// <summary>

/// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)

/// </summary>

/// <param name="strSQL">SQL语句</param>

/// <param name="fs">图像字节,数据库的字段类型为image的情况</param>

/// <returns>影响的记录数</returns>

public static int ExecuteSqlInsertImg(string strSQL,byte[] fs)

{

using (OracleConnection connection = new OracleConnection(connectionString))

{

OracleCommand cmd = new OracleCommand(strSQL,connection);

System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@fs", OracleType.LongRaw);

myParameter.Value = fs ;

cmd.Parameters.Add(myParameter);

try

{

connection.Open();

int rows=cmd.ExecuteNonQuery();

return rows;

}

catch(System.Data.OracleClient.OracleException E)

{

throw new Exception(E.Message);

}

finally

{

cmd.Dispose();

connection.Close();

}

}

}

/// <summary>

/// 执行一条计算查询结果语句，返回查询结果（object）。

/// </summary>

/// <param name="SQLString">计算查询结果语句</param>

/// <returns>查询结果（object）</returns>

public static object GetSingle(string SQLString)

{

using (OracleConnection connection = new OracleConnection(connectionString))

{

using(OracleCommand cmd = new OracleCommand(SQLString,connection))

{

try

{

connection.Open();

object obj = cmd.ExecuteScalar();

if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))

{

return null;

}

else

{

return obj;

}

}

catch(System.Data.OracleClient.OracleException e)

{

connection.Close();

throw new Exception(e.Message);

}

}

}

}

/// <summary>

/// 执行查询语句，返回OracleDataReader ( 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>OracleDataReader</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 new Exception(e.Message);

}

}

/// <summary>

/// 执行查询语句，返回DataSet

/// </summary>

/// <param name="SQLString">查询语句</param>

/// <returns>DataSet</returns>

public static DataSet Query(string SQLString)

{

using (OracleConnection connection = new OracleConnection(connectionString))

{

DataSet ds = new DataSet();

try

{

connection.Open();

OracleDataAdapter command = new OracleDataAdapter(SQLString,connection);

command.Fill(ds,"ds");

}

catch(System.Data.OracleClient.OracleException ex)

{

throw new Exception(ex.Message);

}

return ds;

}

}

#endregion

#region 执行带参数的SQL语句

/// <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,params OracleParameter[] cmdParms)

{

using (OracleConnection connection = new OracleConnection(connectionString))

{

using (OracleCommand cmd = new OracleCommand())

{

try

{

PrepareCommand(cmd, connection, null,SQLString, cmdParms);

int rows=cmd.ExecuteNonQuery();

cmd.Parameters.Clear();

return rows;

}

catch(System.Data.OracleClient.OracleException E)

{

throw new Exception(E.Message);

}

}

}

}

/// <summary>

/// 执行多条SQL语句，实现数据库事务。

/// </summary>

/// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的OracleParameter[]）</param>

public static void ExecuteSqlTran(Hashtable SQLStringList)

{

using (OracleConnection conn = new OracleConnection(connectionString))

{

conn.Open();

using (OracleTransaction trans = conn.BeginTransaction())

{

OracleCommand cmd = new OracleCommand();

try

{

//循环

foreach (DictionaryEntry myDE in SQLStringList)

{

string cmdText=myDE.Key.ToString();

OracleParameter[] cmdParms=(OracleParameter[])myDE.Value;

PrepareCommand(cmd,conn,trans,cmdText, cmdParms);

int val = cmd.ExecuteNonQuery();

cmd.Parameters.Clear();

trans.Commit();

}

}

catch

{

trans.Rollback();

throw;

}

}

}

}

/// <summary>

/// 执行一条计算查询结果语句，返回查询结果（object）。

/// </summary>

/// <param name="SQLString">计算查询结果语句</param>

/// <returns>查询结果（object）</returns>

public static object GetSingle(string SQLString,params OracleParameter[] cmdParms)

{

using (OracleConnection connection = new OracleConnection(connectionString))

{

using (OracleCommand cmd = new OracleCommand())

{

try

{

PrepareCommand(cmd, connection, null,SQLString, cmdParms);

object obj = cmd.ExecuteScalar();

cmd.Parameters.Clear();

if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))

{

return null;

}

else

{

return obj;

}

}

catch(System.Data.OracleClient.OracleException e)

{

throw new Exception(e.Message);

}

}

}

}

/// <summary>

/// 执行查询语句，返回OracleDataReader ( 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>OracleDataReader</returns>

public static OracleDataReader ExecuteReader(string SQLString,params OracleParameter[] cmdParms)

{

OracleConnection connection = new OracleConnection(connectionString);

OracleCommand cmd = new OracleCommand();

try

{

PrepareCommand(cmd, connection, null,SQLString, cmdParms);

OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);

cmd.Parameters.Clear();

return myReader;

}

catch(System.Data.OracleClient.OracleException e)

{

throw new Exception(e.Message);

}

}

/// <summary>

/// 执行查询语句，返回DataSet

/// </summary>

/// <param name="SQLString">查询语句</param>

/// <returns>DataSet</returns>

public static DataSet Query(string SQLString,params OracleParameter[] cmdParms)

{

using (OracleConnection connection = new OracleConnection(connectionString))

{

OracleCommand cmd = new OracleCommand();

PrepareCommand(cmd, connection, null,SQLString, cmdParms);

using( OracleDataAdapter da = new OracleDataAdapter(cmd) )

{

DataSet ds = new DataSet();

try

{

da.Fill(ds,"ds");

cmd.Parameters.Clear();

}

catch(System.Data.OracleClient.OracleException ex)

{

throw new Exception(ex.Message);

}

return ds;

}

}

}

private static void PrepareCommand(OracleCommand cmd,OracleConnection conn,OracleTransaction trans, 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 = CommandType.Text;//cmdType;

if (cmdParms != null)

{

foreach (OracleParameter parm in cmdParms)

cmd.Parameters.Add(parm);

}

}

#endregion

#region 存储过程操作

/// <summary>

/// 执行存储过程 返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )

/// </summary>

/// <param name="storedProcName">存储过程名</param>

/// <param name="parameters">存储过程参数</param>

/// <returns>OracleDataReader</returns>

public static OracleDataReader RunProcedure(string storedProcName, IDataParameter[] parameters )

{

OracleConnection connection = new OracleConnection(connectionString);

OracleDataReader returnReader;

connection.Open();

OracleCommand command = BuildQueryCommand( connection,storedProcName, parameters );

command.CommandType = CommandType.StoredProcedure;

returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);

return returnReader;

}

/// <summary>

/// 执行存储过程

/// </summary>

/// <param name="storedProcName">存储过程名</param>

/// <param name="parameters">存储过程参数</param>

/// <param name="tableName">DataSet结果中的表名</param>

/// <returns>DataSet</returns>

public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName )

{

using (OracleConnection connection = new OracleConnection(connectionString))

{

DataSet dataSet = new DataSet();

connection.Open();

OracleDataAdapter sqlDA = new OracleDataAdapter();

sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters );

sqlDA.Fill( dataSet, tableName );

connection.Close();

return dataSet;

}

}

/// <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)

{

command.Parameters.Add( parameter );

}

return command;

}

/// <summary>

/// 执行存储过程，返回影响的行数

/// </summary>

/// <param name="storedProcName">存储过程名</param>

/// <param name="parameters">存储过程参数</param>

/// <param name="rowsAffected">影响的行数</param>

/// <returns></returns>

public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected )

{

using (OracleConnection connection = new OracleConnection(connectionString))

{

int result;

connection.Open();

OracleCommand command = BuildIntCommand(connection,storedProcName, parameters );

rowsAffected = command.ExecuteNonQuery();

result = (int)command.Parameters["ReturnValue"].Value;

//Connection.Close();

return result;

}

}

/// <summary>

/// 创建 OracleCommand 对象实例(用来返回一个整数值)

/// </summary>

/// <param name="storedProcName">存储过程名</param>

/// <param name="parameters">存储过程参数</param>

/// <returns>OracleCommand 对象实例</returns>

private static OracleCommand BuildIntCommand(OracleConnection connection,string storedProcName, IDataParameter[] parameters)

{

OracleCommand command = BuildQueryCommand(connection,storedProcName, parameters );

command.Parameters.Add( new OracleParameter ( "ReturnValue",

OracleType.Int32, 4, ParameterDirection.ReturnValue,

false,0,0,string.Empty,DataRowVersion.Default,null ));

return command;

}

#endregion

}

}