using System;
using System.Data;
using System.Data.OleDb;
using System.Configuration;
namespace yueying.Components
{
/// <summary>
/// DBClass 的摘要说明。
/// </summary>
public class DBClass
{
protected static string strConn = ConfigurationSettings.AppSettings["strConn"];
public DBClass()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
//功能:执行sql语句,返回bool
internal bool ExecuteSql(string strSQL)
{
bool success=false;
OleDbConnection conn = new OleDbConnection(strConn);
OleDbCommand myCmd = new OleDbCommand(strSQL,conn);
try
{
conn.Open();
myCmd.ExecuteNonQuery();
success=true;
}
catch(System.Data.OleDb.OleDbException e)
{
throw new Exception(e.Message);
}
finally
{
myCmd.Dispose();
conn.Close();
}
return success;
}
//功能:执行sql语句,如果有记录的话返回1,否则返回0
internal int ExecuteSqlDr(string strSQL)
{
OleDbConnection myCn = new OleDbConnection(strConn);
OleDbCommand myCmd = new OleDbCommand(strSQL,myCn);
try
{
myCn.Open();
OleDbDataReader myDr = myCmd.ExecuteReader();
if(myDr.Read())
{
return 1;
}
else
{
return 0;
}
}
catch(System.Data.OleDb.OleDbException e)
{
throw new Exception(e.Message);
}
finally
{
myCmd.Dispose();
myCn.Close();
}
}
//功能:执行SQL语句,返回DataSet
internal DataSet ExecuteSqlDs(string strSQL ,string tablename)
{
OleDbConnection myCn = new OleDbConnection(strConn);
try
{
myCn.Open();
OleDbDataAdapter myDa = new OleDbDataAdapter(strSQL,myCn);
DataSet ds = new DataSet();
myDa.Fill(ds,tablename);
return ds;
}
catch(System.Data.OleDb.OleDbException e)
{
throw new Exception(e.Message);
}
finally
{
myCn.Close();
}
}
//执行SQL语句,返回DataReader
internal OleDbDataReader ExecuteSqlDataReader(string strSQL)
{
OleDbConnection myCn = new OleDbConnection(strConn);
OleDbCommand myCmd = new OleDbCommand(strSQL,myCn);
try
{
myCn.Open();
return myCmd.ExecuteReader(CommandBehavior.CloseConnection);
}
catch
{
myCn.Close();
throw;
}
}
//执行SQL语句,返回执行cmd的Scalar方法的值
internal int ExecuteSqlScalar(string strSQL)
{
OleDbConnection myCn = new OleDbConnection(strConn);
OleDbCommand myCmd = new OleDbCommand(strSQL,myCn);
try
{
myCn.Open();
object r = myCmd.ExecuteScalar();
if(Object.Equals(r,null))
{
throw new Exception("value unavailable！");
}
else
{
return (int)r;
}
}
catch(System.Data.OleDb.OleDbException e)
{
throw new Exception(e.Message);
}
finally
{
myCmd.Dispose();
myCn.Close();
}
}
internal object ExecuteSql4ValueEx(string strSQL)
{
OleDbConnection myCn = new OleDbConnection(strConn);
OleDbCommand myCmd = new OleDbCommand(strSQL,myCn);
try
{
myCn.Open();
object r = myCmd.ExecuteScalar();
if(Object.Equals(r,null))
{
throw new Exception("object unavailable!");
}
else
{
return r;
}
}
catch(System.Data.OleDb.OleDbException e)
{
throw new Exception(e.Message);
}
finally
{
myCmd.Dispose();
myCn.Close();
}
}
}
}
