初学ADO.NET时写的数据库访问类_Web开发_学习笔记★闵涛★计算机学习电脑编程软硬件技巧


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初学ADO.NET时写的数据库访问类

作者：闵涛文章来源：闵涛的学习笔记点击数：2543 更新时间：2009/4/23 10:38:53

mary>
  /// 返回DataSet
  /// </summary>
  public DataSet ExeSqlDs(OleDbCommand oleDbCmd, string strTable)
  {
   m_strError = "";
   DataSet ds = new DataSet();
   oleDbCmd.Connection = m_oleDbCnn;
   OleDbDataAdapter oleDbAdapter = new OleDbDataAdapter();
   oleDbAdapter.SelectCommand = oleDbCmd;
   try
   {
    oleDbAdapter.Fill(ds,strTable);
   }
   catch (OleDbException ex)
   {
    ds = null;
    m_strError = ex.ToString();
   }
   return ds;
  }

  /// <summary>
  /// //设定Connection 字符串，new cnn
  /// </summary>
  public void SetConnectionString(string strSource)
  {
   m_strCnn = strSource;
   m_oleDbCnn = null;
   m_oleDbCnn = new OleDbConnection(m_strCnn);
  }

  /// <summary>
  /// 错误信息
  /// </summary>
  private string m_strError;

  /// <summary>
  /// 错误
  /// </summary>
  public string StrErrorInfo
  {
   get
   {
    return m_strError;
   }
  }
}
}

/*************************************************

SqlDb

**************************************************/

using System;
using System.IO;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace Db
{
/// <summary>
///
/// </summary>
public class SqlDb
{

  public SqlDb()
  {
   //
   // TODO: 在此处添加构造函数逻辑
   m_sqlCnn = null;
   //
  }

  /// <summary>
  /// Connection参数
  /// </summary>
  private string m_strCnn;   // = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
  private SqlConnection m_sqlCnn = null;    //new SqlConnection(m_strCnn);

  /// <summary>
  /// 执行delete，insert，update等操作，返回值为影响的行数
  /// </summary>
  public int ExeNoQuery(string strSql)
  {
   int nRet = -1;
   m_strError = "";
   SqlCommand sqlCmd = new SqlCommand(strSql,m_sqlCnn);
   try
   {
    OpenCnn();
    nRet = sqlCmd.ExecuteNonQuery();
   }
   catch (SqlException ex)
   {
    nRet = -1;
    m_strError = ex.ToString();
   }
   finally
   {
    if (m_sqlCnn.State==ConnectionState.Open)
    {
     sqlCmd.Dispose();
     m_sqlCnn.Close();
    }
   }
   return nRet;
  }

  /// <summary>
  /// 执行delete，update,insert操作，返回值为受影响的行数
  /// </summary>
  public int ExeNoQuery(SqlCommand sqlCmd)
  {
   int nRet = -1;
   m_strError = "";
   sqlCmd.Connection = m_sqlCnn;
   try
   {
    OpenCnn();
    nRet = sqlCmd.ExecuteNonQuery();
   }
   catch (SqlException ex)
   {
    nRet = -1;
    m_strError = ex.ToString();
   }
   finally
   {
    if (m_sqlCnn.State==ConnectionState.Open)
    {
     m_sqlCnn.Close();
    }
   }
   return nRet;
  }

  //判断是否存在
  public int ExeIsExist(string strSql)
  {
   int nExist = -1;
   m_strError = "";
   SqlCommand sqlCmd = new SqlCommand(strSql,m_sqlCnn);
   try
   {
    OpenCnn();
    SqlDataReader sqlReader = sqlCmd.ExecuteReader();
    if (sqlReader.Read())
    {
     nExist = 1;
    }
    else
    {
     nExist = 0;
    }

   }
   catch (SqlException ex)
   {
    nExist = -1;
    m_strError = ex.ToString();
   }
   finally
   {
    if (m_sqlCnn.State==ConnectionState.Open)
    {
     sqlCmd.Dispose();
     m_sqlCnn.Close();
    }
   }
   return nExist;
  }

  /// <summary>
  /// 判断是否存在
  /// </summary>
  public int ExeIsExist(SqlCommand sqlCmd)
  {
   int nExist = -1;
   m_strError = "";
   sqlCmd.Connection = m_sqlCnn;
   try
   {
    OpenCnn();
    SqlDataReader sqlReader = sqlCmd.ExecuteReader();
    if (sqlReader.Read())
    {
     nExist = 1;
    }
    else
    {
     nExist = 0;
    }
   }
   catch (SqlException ex)
   {
    nExist = -1;
    m_strError = ex.ToString();
   }
   finally
   {
    if (m_sqlCnn.State==ConnectionState.Open)
    {
     m_sqlCnn.Close();
    }
   }
   return nExist;
  }

  /// <summary>
  /// //返回DataSet
  /// </summary>
  public DataSet ExeSqlDs(string strSql, string strTable)
  {
   m_strError = "";
   SqlDataAdapter sqlAdapter = new SqlDataAdapter(strSql,m_sqlCnn);
   DataSet dbSet = new DataSet();
   try
   {
    sqlAdapter.Fill(dbSet,strTable);
   }
   catch (SqlException ex)
   {
    dbSet = null;
    m_strError = ex.ToString();
   }

   return dbSet;
  }

  /// <summary>
  /// //返回DataSet
  /// </summary>
  public DataSet ExeSqlDs(string strSql, int nStart, int nCount, string strTable)
  {
   m_strError = "";
   SqlDataAdapter sqlAdapter = new SqlDataAdapter(strSql,m_sqlCnn);
   DataSet dbSet = new DataSet();
   try
   {
    sqlAdapter.Fill(dbSet,nStart,nCount,strTable);
   }
   catch (SqlException ex)
   {
    dbSet = null;
    m_strError = ex.ToString();
   }
   return dbSet;
  }

  //返回DataReader
  public SqlDataReader ExeSqlDr(string strSql)
  {
   m_strError = "";
   SqlDataReader dr = null;
   SqlCommand sqlCmd = new SqlCommand(strSql,m_sqlCnn);
   try
   {
    OpenCnn();
    dr = sqlCmd.ExecuteReader();
   }
   catch (SqlException ex)
   {
    dr = null;
    m_strError = ex.ToString();
   }
   finally
   {
    if (m_sqlCnn.State==ConnectionState.Open)
    {
     sqlCmd.Dispose();
    }
   }
   return dr;
  }