asp.net下Oracle,SQL Server,Access万能数据库通用类

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.SqlClient;
using System.Data.OleDb;
using System.Data.OracleClient;
using System.Configuration;
using System.Reflection;

namespace SystemFramework.DAL
{
/**////

/// All rights reserved
/// 数据访问基础类
/// 用户可以修改满足自己项目的需要。
///

public class DataBaseLayer
{
//数据库连接字符串(web.config来配置)
//
private string connectionString;
public string ConntionString
{
get
{
return connectionString ;
}
set
{
connectionString = value;
}
}


public DataBaseLayer(string strConnect,string dataType)
{
this.ConntionString = strConnect;
this.DbType = dataType;
}


public DataBaseLayer()
{
this.connectionString = ConfigurationSettings.AppSettings["ConnectionString"] ;
this.dbType = ConfigurationSettings.AppSettings["DataType"] ;
}

/**////

/// 数据库类型
///

private string dbType;
public string DbType
{
get
{
if ( dbType == string.Empty || dbType == null )
{
return "Access";
}
else
{
return dbType;
}
}
set
{
if ( value != string.Empty && value != null )
{
dbType = value;
}
if (dbType ==string.Empty || dbType == null)
{
dbType = ConfigurationSettings.AppSettings["DataType"];
}
if ( dbType == string.Empty || dbType == null )
{
dbType = "Access";
}
}
}




转换参数#region 转换参数
private System.Data.IDbDataParameter iDbPara(string ParaName,string DataType)
{
switch(this.DbType)
{
case "SqlServer":
return GetSqlPara(ParaName,DataType);

case "Oracle":
return GetOleDbPara(ParaName,DataType);

case "Access":
return GetOleDbPara(ParaName,DataType);

default :
return GetSqlPara(ParaName,DataType);

}
}

private System.Data.SqlClient.SqlParameter GetSqlPara( string ParaName , string DataType)
{
switch(DataType)
{
case "Decimal":
return new System.Data.SqlClient.SqlParameter ( ParaName, System.Data.SqlDbType.Decimal );
case "Varchar":
return new System.Data.SqlClient.SqlParameter ( ParaName, System.Data.SqlDbType.VarChar );
case "DateTime":
return new System.Data.SqlClient.SqlParameter ( ParaName, System.Data.SqlDbType.DateTime );
case "Iamge":
return new System.Data.SqlClient.SqlParameter ( ParaName, System.Data.SqlDbType.Image );
case "Int":
return new System.Data.SqlClient.SqlParameter ( ParaName, System.Data.SqlDbType.Int );
case "Text":
return new System.Data.SqlClient.SqlParameter ( ParaName, System.Data.SqlDbType.NText );
default :
return new System.Data.SqlClient.SqlParameter ( ParaName, System.Data.SqlDbType.VarChar );
}
}

private System.Data.OracleClient.OracleParameter GetOraclePara( string ParaName , string DataType)
{
switch(DataType)
{
case "Decimal":
return new System.Data.OracleClient.OracleParameter( ParaName, System.Data.OracleClient.OracleType.Double);

case "Varchar":
return new System.Data.OracleClient.OracleParameter ( ParaName, System.Data.OracleClient.OracleType.VarChar );

case "DateTime":
return new System.Data.OracleClient.OracleParameter ( ParaName, System.Data.OracleClient.OracleType.DateTime );

case "Iamge":
return new System.Data.OracleClient.OracleParameter ( ParaName, System.Data.OracleClient.OracleType.BFile );

case "Int":
return new System.Data.OracleClient.OracleParameter ( ParaName, System.Data.OracleClient.OracleType.Int32 );

case "Text":
return new System.Data.OracleClient.OracleParameter ( ParaName, System.Data.OracleClient.OracleType.LongVarChar );

default:
return new System.Data.OracleClient.OracleParameter ( ParaName, System.Data.OracleClient.OracleType.VarChar );

}
}

private System.Data.OleDb.OleDbParameter GetOleDbPara( string ParaName , string DataType)
{
switch(DataType)
{
case "Decimal":
return new System.Data.OleDb.OleDbParameter( ParaName, System.Data.DbType.Decimal);

case "Varchar":
return new System.Data.OleDb.OleDbParameter ( ParaName, System.Data.DbType.String );

case "DateTime":
return new System.Data.OleDb.OleDbParameter ( ParaName, System.Data.DbType.DateTime );

case "Iamge":
return new System.Data.OleDb.OleDbParameter( ParaName, System.Data.DbType.Binary );

case "Int":
return new System.Data.OleDb.OleDbParameter ( ParaName, System.Data.DbType.Int32 );

case "Text":
return new System.Data.OleDb.OleDbParameter ( ParaName, System.Data.DbType.String );

default:
return new System.Data.OleDb.OleDbParameter ( ParaName, System.Data.DbType.String );

}
}

#endregion

创建 Connection 和 Command#region 创建 Connection 和 Command

private IDbConnection GetConnection()
{
switch(this.DbType)
{
case "SqlServer":
return new System.Data.SqlClient.SqlConnection(this.ConntionString);

case "Oracle":
return new System.Data.OracleClient.OracleConnection(this.ConntionString);

case "Access":
return new System.Data.OleDb.OleDbConnection(this.ConntionString);
default:
return new System.Data.SqlClient.SqlConnection(this.ConntionString);
}
}


private IDbCommand GetCommand(string Sql,IDbConnection iConn)
{
switch(this.DbType)
{
case "SqlServer":
return new System.Data.SqlClient.SqlCommand(Sql,(SqlConnection)iConn);

case "Oracle":
return new System.Data.OracleClient.OracleCommand(Sql,(OracleConnection)iConn);

case "Access":
return new System.Data.OleDb.OleDbCommand(Sql,(OleDbConnection)iConn);
default:
return new System.Data.SqlClient.SqlCommand(Sql,(SqlConnection)iConn);
}
}

private IDbCommand GetCommand()
{
switch(this.DbType)
{
case "SqlServer":
return new System.Data.SqlClient.SqlCommand();

case "Oracle":
return new System.Data.OracleClient.OracleCommand();

case "Access":
return new System.Data.OleDb.OleDbCommand();
default:
return new System.Data.SqlClient.SqlCommand();
}
}

private IDataAdapter GetAdapater(string Sql,IDbConnection iConn)
{
switch(this.DbType)
{
case "SqlServer":
return new System.Data.SqlClient.SqlDataAdapter(Sql,(SqlConnection)iConn);

case "Oracle":
return new System.Data.OracleClient.OracleDataAdapter(Sql,(OracleConnection)iConn);

case "Access":
return new System.Data.OleDb.OleDbDataAdapter(Sql,(OleDbConnection)iConn);

default:
return new System.Data.SqlClient.SqlDataAdapter(Sql,(SqlConnection)iConn);;
}

}

private IDataAdapter GetAdapater()
{
switch(this.DbType)
{
case "SqlServer":
return new System.Data.SqlClient.SqlDataAdapter();

case "Oracle":
return new System.Data.OracleClient.OracleDataAdapter();

case "Access":
return new System.Data.OleDb.OleDbDataAdapter();

default:
return new System.Data.SqlClient.SqlDataAdapter();
}
}

private IDataAdapter GetAdapater(IDbCommand iCmd)
{
switch(this.DbType)
{
case "SqlServer":
return new System.Data.SqlClient.SqlDataAdapter((SqlCommand)iCmd);

case "Oracle":
return new System.Data.OracleClient.OracleDataAdapter((OracleCommand)iCmd);

case "Access":
return new System.Data.OleDb.OleDbDataAdapter((OleDbCommand)iCmd);

default:
return new System.Data.SqlClient.SqlDataAdapter((SqlCommand)iCmd);
}
}
#endregion

执行简单SQL语句#region 执行简单SQL语句
/**////

/// 执行SQL语句，返回影响的记录数
///

/// SQL语句
/// 影响的记录数
public int ExecuteSql(string SqlString)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
using (System.Data.IDbCommand iCmd = GetCommand(SqlString,iConn))
{
iConn.Open();
try
{

int rows=iCmd.ExecuteNonQuery();
return rows;
}
catch(System.Exception E)
{
throw new Exception(E.Message);
}
finally
{
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
}

/**////

/// 执行多条SQL语句，实现数据库事务。
///

/// 多条SQL语句
public void ExecuteSqlTran(ArrayList SQLStringList)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
iConn.Open();
using(System.Data.IDbCommand iCmd = GetCommand())
{
iCmd.Connection=iConn;
using(System.Data.IDbTransaction iDbTran = iConn.BeginTransaction())
{
iCmd.Transaction=iDbTran;
try
{
for(int n=0;n{
string strsql = SQLStringList[n].ToString();
if ( strsql.Trim().Length>1)
{
iCmd.CommandText = strsql;
iCmd.ExecuteNonQuery();
}
}
iDbTran.Commit();
}
catch(System.Exception E)
{
iDbTran.Rollback();
throw new Exception(E.Message);
}
finally
{
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}

}

}
}
/**////

/// 执行带一个存储过程参数的的SQL语句。
///

/// SQL语句
/// 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
/// 影响的记录数
public int ExecuteSql(string SqlString,string content)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
using(System.Data.IDbCommand iCmd = GetCommand(SqlString,iConn))
{
System.Data.IDataParameter myParameter = this.iDbPara( "@content", "Text");
myParameter.Value = content ;
iCmd.Parameters.Add(myParameter);
iConn.Open();
try
{

int rows = iCmd.ExecuteNonQuery();
return rows;
}
catch( System.Exception e )
{
throw new Exception(e.Message);
}
finally
{
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
}


/**////

/// 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)
///

/// SQL语句
/// 图像字节,数据库的字段类型为image的情况
/// 影响的记录数
public int ExecuteSqlInsertImg(string SqlString,byte[] fs)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
using(System.Data.IDbCommand iCmd = GetCommand(SqlString,iConn))
{
System.Data.IDataParameter myParameter = this.iDbPara( "@content", "Image");
myParameter.Value = fs ;
iCmd.Parameters.Add(myParameter);
iConn.Open();
try
{
int rows = iCmd.ExecuteNonQuery();
return rows;
}
catch( System.Exception e )
{
throw new Exception(e.Message);
}
finally
{
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
}

/**////

/// 执行一条计算查询结果语句，返回查询结果（object）。
///

/// 计算查询结果语句
/// 查询结果（object）
public object GetSingle(string SqlString)
{
using (System.Data.IDbConnection iConn = GetConnection())
{
using (System.Data.IDbCommand iCmd = GetCommand(SqlString,iConn))
{
iConn.Open();
try
{
object obj = iCmd.ExecuteScalar();
if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch(System.Exception e)
{
throw new Exception(e.Message);
}
finally
{
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
}
/**////

/// 执行查询语句，返回IDataAdapter
///

/// 查询语句
/// IDataAdapter
public IDataAdapter ExecuteReader(string strSQL)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
iConn.Open();
try
{
System.Data.IDataAdapter iAdapter = this.GetAdapater(strSQL,iConn);
return iAdapter;
}
catch(System.Exception e)
{
throw new Exception(e.Message);
}
finally
{
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
/**////

/// 执行查询语句，返回DataSet
///

/// 查询语句
/// DataSet
public DataSet Query(string sqlString)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
using(System.Data.IDbCommand iCmd = GetCommand(sqlString,iConn))
{
DataSet ds = new DataSet();
iConn.Open();
try
{
System.Data.IDataAdapter iAdapter = this.GetAdapater(sqlString,iConn);
iAdapter.Fill(ds);
return ds;
}
catch(System.Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
}

/**////

/// 执行查询语句，返回DataSet
///

/// 查询语句
/// 要填充的DataSet
/// 要填充的表名
/// DataSet
public DataSet Query(string sqlString,DataSet dataSet,string tableName)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
using(System.Data.IDbCommand iCmd = GetCommand(sqlString,iConn))
{
iConn.Open();
try
{
System.Data.IDataAdapter iAdapter = this.GetAdapater(sqlString,iConn);
((OleDbDataAdapter)iAdapter).Fill(dataSet,tableName);
return dataSet;
}
catch(System.Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
}


/**////

/// 执行SQL语句 返回存储过程
///

/// Sql语句
/// 要填充的DataSet
/// 开始记录
/// 页面记录大小
/// 表名称
/// DataSet
public DataSet Query(string sqlString , DataSet dataSet ,int startIndex ,int pageSize, string tableName )
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
iConn.Open();
try
{
System.Data.IDataAdapter iAdapter = this.GetAdapater(sqlString,iConn);

((OleDbDataAdapter)iAdapter).Fill(dataSet,startIndex,pageSize,tableName);

return dataSet;
}
catch(Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}


/**////

/// 执行查询语句，向XML文件写入数据
///

/// 查询语句
/// XML文件路径
public void WriteToXml(string sqlString,string xmlPath)
{
Query(sqlString).WriteXml(xmlPath);
}

/**////

/// 执行查询语句
///

/// 查询语句
/// DataTable
public DataTable ExecuteQuery(string sqlString)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
//System.Data.IDbCommand iCmd = GetCommand(sqlString,iConn);
DataSet ds = new DataSet();
try
{
System.Data.IDataAdapter iAdapter = this.GetAdapater(sqlString,iConn);
iAdapter.Fill(ds);
}
catch(System.Exception e)
{
throw new Exception(e.Message);
}
finally
{
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
return ds.Tables[0];
}
}

/**////

/// 执行查询语句
///

/// 查询语句
/// DataTable
public DataTable ExecuteQuery(string SqlString,string Proc)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
using(System.Data.IDbCommand iCmd = GetCommand(SqlString,iConn))
{
iCmd.CommandType = CommandType.StoredProcedure;
DataSet ds = new DataSet();
try
{
System.Data.IDataAdapter iDataAdapter = this.GetAdapater(SqlString,iConn);
iDataAdapter.Fill(ds);
}
catch(System.Exception e)
{
throw new Exception(e.Message);
}
finally
{
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
return ds.Tables[0];
}


}
}

/**////

///
///

///
///
public DataView ExeceuteDataView(string Sql)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
using(System.Data.IDbCommand iCmd = GetCommand(Sql,iConn))
{
DataSet ds = new DataSet();
try
{
System.Data.IDataAdapter iDataAdapter = this.GetAdapater(Sql,iConn);
iDataAdapter.Fill(ds);
return ds.Tables[0].DefaultView;
}
catch(System.Exception e)
{
throw new Exception(e.Message);
}
finally
{
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
}

#endregion

执行带参数的SQL语句#region 执行带参数的SQL语句
/**////

/// 执行SQL语句，返回影响的记录数
///

/// SQL语句
/// 影响的记录数
public int ExecuteSql(string SQLString,params IDataParameter[] iParms)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
System.Data.IDbCommand iCmd = GetCommand();
{
try
{
PrepareCommand(out iCmd, iConn, null , SQLString, iParms );
int rows=iCmd.ExecuteNonQuery();
iCmd.Parameters.Clear();
return rows;
}
catch(System.Exception E)
{
throw new Exception( E.Message );
}
finally
{
iCmd.Dispose();
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
}


/**////

/// 执行多条SQL语句，实现数据库事务。
///

/// SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）
public void ExecuteSqlTran(Hashtable SQLStringList)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
iConn.Open();
using (IDbTransaction iTrans = iConn.BeginTransaction())
{
System.Data.IDbCommand iCmd = GetCommand();
try
{
//循环
foreach ( DictionaryEntry myDE in SQLStringList)
{
string cmdText = myDE.Key.ToString();
IDataParameter[] iParms=( IDataParameter[] ) myDE.Value;
PrepareCommand( out iCmd , iConn , iTrans , cmdText , iParms );
int val = iCmd.ExecuteNonQuery();
iCmd.Parameters.Clear();
}
iTrans.Commit();
}
catch
{
iTrans.Rollback();
throw;
}
finally
{
iCmd.Dispose();
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}

}
}
}


/**////

/// 执行一条计算查询结果语句，返回查询结果（object）。
///

/// 计算查询结果语句
/// 查询结果（object）
public object GetSingle(string SQLString,params IDataParameter[] iParms)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
System.Data.IDbCommand iCmd = GetCommand();
{
try
{
PrepareCommand( out iCmd, iConn, null , SQLString, iParms );
object obj = iCmd.ExecuteScalar();
iCmd.Parameters.Clear();
if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch(System.Exception e)
{
throw new Exception(e.Message);
}
finally
{
iCmd.Dispose();
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
}

/**////

/// 执行查询语句，返回IDataReader
///

/// 查询语句
/// IDataReader
public IDataReader ExecuteReader(string SQLString,params IDataParameter[] iParms)
{
System.Data.IDbConnection iConn = this.GetConnection();
{
System.Data.IDbCommand iCmd = GetCommand();
{
try
{
PrepareCommand(out iCmd, iConn , null , SQLString , iParms);
System.Data.IDataReader iReader = iCmd.ExecuteReader();
iCmd.Parameters.Clear();
return iReader;
}
catch(System.Exception e)
{
throw new Exception(e.Message);
}
finally
{
iCmd.Dispose();
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
}

/**////

/// 执行查询语句，返回DataSet
///

/// 查询语句
/// DataSet
public DataSet Query(string sqlString,params IDataParameter[] iParms)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
IDbCommand iCmd = GetCommand();
{
PrepareCommand(out iCmd , iConn , null , sqlString , iParms );
try
{
IDataAdapter iAdapter = this.GetAdapater(sqlString,iConn);
DataSet ds = new DataSet();
iAdapter.Fill(ds);
iCmd.Parameters.Clear();
return ds;
}
catch(System.Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
iCmd.Dispose();
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}
}
}
}


/**////

/// 初始化Command
///

///
///
///
///
///
private void PrepareCommand(out IDbCommand iCmd,IDbConnection iConn,System.Data.IDbTransaction iTrans, string cmdText, IDataParameter[] iParms)
{
if (iConn.State != ConnectionState.Open)
iConn.Open();
iCmd = this.GetCommand();
iCmd.Connection = iConn;
iCmd.CommandText = cmdText;
if (iTrans != null)
iCmd.Transaction = iTrans;
iCmd.CommandType = CommandType.Text;//cmdType;
if (iParms != null)
{
foreach (IDataParameter parm in iParms)
iCmd.Parameters.Add(parm);
}
}

#endregion

存储过程操作#region 存储过程操作

/**////

/// 执行存储过程
///

/// 存储过程名
/// 存储过程参数
/// SqlDataReader
public SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters )
{
System.Data.IDbConnection iConn = this.GetConnection();
{
iConn.Open();

using(SqlCommand sqlCmd = BuildQueryCommand(iConn,storedProcName, parameters))
{
return sqlCmd.ExecuteReader(CommandBehavior.CloseConnection);
}
}
}

/**////

/// 执行存储过程
///

/// 存储过程名
/// 存储过程参数
/// DataSet结果中的表名
/// DataSet
public DataSet RunProcedure(string storedProcName, IDataParameter[] parameters ,string tableName)
{

using (System.Data.IDbConnection iConn = this.GetConnection())
{
DataSet dataSet = new DataSet();
iConn.Open();
System.Data.IDataAdapter iDA = this.GetAdapater();
iDA = this.GetAdapater( BuildQueryCommand(iConn, storedProcName, parameters ) );

((SqlDataAdapter)iDA).Fill( dataSet,tableName);
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
return dataSet;
}
}



/**////

/// 执行存储过程
///

/// 存储过程名
/// 存储过程参数
/// DataSet结果中的表名
/// 开始记录索引
/// 页面记录大小
/// DataSet
public DataSet RunProcedure(string storedProcName, IDataParameter[] parameters ,int startIndex,int pageSize,string tableName)
{

using (System.Data.IDbConnection iConn = this.GetConnection())
{
DataSet dataSet = new DataSet();
iConn.Open();
System.Data.IDataAdapter iDA = this.GetAdapater();
iDA = this.GetAdapater( BuildQueryCommand(iConn, storedProcName, parameters ) );

((SqlDataAdapter)iDA).Fill( dataSet,startIndex,pageSize,tableName);
if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
return dataSet;
}
}

/**////

/// 执行存储过程 填充已经存在的DataSet数据集
///

/// 存储过程名称
/// 存储过程参数
/// 要填充的数据集
/// 要填充的表名
///
public DataSet RunProcedure(string storeProcName,IDataParameter[] parameters,DataSet dataSet,string tableName)
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
iConn.Open();
System.Data.IDataAdapter iDA = this.GetAdapater();
iDA = this.GetAdapater(BuildQueryCommand(iConn,storeProcName,parameters));

((SqlDataAdapter)iDA).Fill(dataSet,tableName);

if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}

return dataSet;
}
}

/**////

/// 执行存储过程并返回受影响的行数
///

///
///
///
public int RunProcedureNoQuery(string storedProcName, IDataParameter[] parameters )
{

int result = 0;
using (System.Data.IDbConnection iConn = this.GetConnection())
{
iConn.Open();
using(SqlCommand scmd = BuildQueryCommand(iConn,storedProcName,parameters))
{
result = scmd.ExecuteNonQuery();
}

if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
}

return result ;
}

public string RunProcedureExecuteScalar(string storeProcName,IDataParameter[] parameters)
{
string result = string.Empty;
using (System.Data.IDbConnection iConn = this.GetConnection())
{

iConn.Open();
using(SqlCommand scmd = BuildQueryCommand(iConn,storeProcName,parameters))
{
object obj = scmd.ExecuteScalar();
if(obj == null)
result = null;
else
result = obj.ToString();
}

if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}

}

return result;
}

/**////

/// 构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)
///

/// 数据库连接
/// 存储过程名
/// 存储过程参数
/// SqlCommand
private SqlCommand BuildQueryCommand(IDbConnection iConn,string storedProcName, IDataParameter[] parameters)
{

IDbCommand iCmd = GetCommand(storedProcName,iConn);
iCmd.CommandType = CommandType.StoredProcedure;
if (parameters == null)
{
return (SqlCommand)iCmd;
}
foreach (IDataParameter parameter in parameters)
{
iCmd.Parameters.Add( parameter );
}
return (SqlCommand)iCmd;
}

/**////

/// 执行存储过程，返回影响的行数
///

/// 存储过程名
/// 存储过程参数
/// 影响的行数
///
public int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected )
{
using (System.Data.IDbConnection iConn = this.GetConnection())
{
int result;
iConn.Open();
using(SqlCommand sqlCmd = BuildIntCommand(iConn,storedProcName, parameters ))
{
rowsAffected = sqlCmd.ExecuteNonQuery();
result = (int)sqlCmd.Parameters["ReturnValue"].Value;

if(iConn.State != ConnectionState.Closed)
{
iConn.Close();
}
return result;
}
}
}

/**////

/// 创建 SqlCommand 对象实例(用来返回一个整数值)
///

/// 存储过程名
/// 存储过程参数
/// SqlCommand 对象实例
private SqlCommand BuildIntCommand(IDbConnection iConn,string storedProcName, IDataParameter[] parameters)
{
SqlCommand sqlCmd = BuildQueryCommand(iConn,storedProcName, parameters );
sqlCmd.Parameters.Add( new SqlParameter ( "ReturnValue",
SqlDbType.Int,4,ParameterDirection.ReturnValue,
false,0,0,string.Empty,DataRowVersion.Default,null ));
return sqlCmd;
}
#endregion


}
}