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初学ADO.NET时写的数据库访问类

王朝c#·作者佚名  2006-01-10
窄屏简体版  字體: |||超大  

初学ADO.NET时写的数据库访问类

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

OleDb

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

using System;

using System.IO;

using System.Data;

using System.Data.OleDb;

using System.Configuration;

namespace Db

{

/// <summary>

///

/// </summary>

public class OleDb

{

public OleDb()

{

//

// TODO: 在此处添加构造函数逻辑

m_oleDbCnn = null;

//

}

/// <summary>

/// Connecion连接 字符

/// </summary>

private string m_strCnn;// = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];

/// <summary>

/// OleDbConnection

/// </summary>

private OleDbConnection m_oleDbCnn = null;//new OleDbConnection(m_strCnn);

/// <summary>

/// 打开Connection

/// </summary>

private void OpenCnn()

{

if (m_oleDbCnn.State==ConnectionState.Open)

{

m_oleDbCnn.Close();

}

m_oleDbCnn.Open();

}

/// <summary>

/// //执行delete,update,insert等操作

/// </summary>

public int ExeNoQuery(string strSql)

{

int nRet = -1;

m_strError = "";

OleDbCommand oleDbCmd = new OleDbCommand(strSql,m_oleDbCnn);

try

{

OpenCnn();

nRet = oleDbCmd.ExecuteNonQuery();

}

catch (OleDbException ex)

{

nRet = -1;

m_strError = ex.ToString();

}

finally

{

if (m_oleDbCnn.State==ConnectionState.Open)

{

oleDbCmd.Dispose();

m_oleDbCnn.Close();

}

}

return nRet;

}

/// <summary>

/// //执行delete,update,insert等操作

/// </summary>

public int ExeNoQuery(OleDbCommand oleDbCmd)

{

int nRet = -1;

m_strError = "";

oleDbCmd.Connection = m_oleDbCnn;

try

{

nRet = oleDbCmd.ExecuteNonQuery();

}

catch (OleDbException ex)

{

nRet = -1;

m_strError = ex.ToString();

}

finally

{

if (m_oleDbCnn.State==ConnectionState.Open)

{

m_oleDbCnn.Close();

}

}

return nRet;

}

/// <summary>

/// 判断是否存在

/// </summary>

public int ExeIsExist(string strSql)

{

int nExist = -1;

m_strError = "";

OleDbCommand oleDbCmd = new OleDbCommand(strSql,m_oleDbCnn);

try

{

OpenCnn();

OleDbDataReader dr= oleDbCmd.ExecuteReader();

if (dr.Read())

{

nExist = 1;

}

else

{

nExist = 0;

}

}

catch (OleDbException ex)

{

nExist = -1;

m_strError = ex.ToString();

}

finally

{

if (m_oleDbCnn.State==ConnectionState.Open)

{

oleDbCmd.Dispose();

m_oleDbCnn.Close();

}

}

return nExist;

}

/// <summary>

/// 判断是否存在

/// </summary>

public int ExeIsExist(OleDbCommand oleDbCmd)

{

int nExist = -1;

m_strError = "";

oleDbCmd.Connection = m_oleDbCnn;

try

{

OpenCnn();

OleDbDataReader dr = oleDbCmd.ExecuteReader();

if (dr.Read())

{

nExist = 1;

}

else

{

nExist = 0;

}

}

catch (OleDbException ex)

{

nExist = -1;

m_strError = ex.ToString();

}

finally

{

if (m_oleDbCnn.State==ConnectionState.Open)

{

m_oleDbCnn.Close();

}

}

return nExist;

}

/// <summary>

/// 执行ExecuteScalar

/// </summary>

public int ExeScalar(string strSql)

{

int nNum = -1;

m_strError = "";

OleDbCommand oleDbCmd = new OleDbCommand(strSql,m_oleDbCnn);

try

{

OpenCnn();

nNum = (int)oleDbCmd.ExecuteScalar();

}

catch (OleDbException ex)

{

nNum = -1;

m_strError = ex.ToString();

}

finally

{

if (m_oleDbCnn.State==ConnectionState.Open)

{

oleDbCmd.Dispose();

m_oleDbCnn.Close();

}

}

return nNum;

}

/// <summary>

/// 返回OleDbDataReader

/// </summary>

public OleDbDataReader ExeSqlDr(string strSql)

{

OleDbDataReader dr = null;

m_strError = "";

OleDbCommand oleDbCmd = new OleDbCommand(strSql,m_oleDbCnn);

try

{

OpenCnn();

dr = oleDbCmd.ExecuteReader();

}

catch (OleDbException ex)

{

dr = null;

m_strError = ex.ToString();

}

finally

{

if (m_oleDbCnn.State==ConnectionState.Open)

{

oleDbCmd.Dispose();

}

}

return dr;

}

/// <summary>

/// 返回DataSet

/// </summary>

public DataSet ExeSqlDs(string strSql, string strTable)

{

m_strError = "";

DataSet ds = new DataSet();

OleDbDataAdapter oleDbAdapter = new OleDbDataAdapter(strSql,m_oleDbCnn);

try

{

oleDbAdapter.Fill(ds,strTable);

}

catch (OleDbException ex)

{

ds = null;

m_strError = ex.ToString();

}

return ds;

}

/// <summary>

/// 返回DataSet

/// </summary>

public DataSet ExeSqlDs(string strSql, int nStart, int nCount, string strTable)

{

m_strError = "";

DataSet ds = new DataSet();

OleDbDataAdapter oleDbAdapter = new OleDbDataAdapter(strSql,m_oleDbCnn);

try

{

oleDbAdapter.Fill(ds,nStart,nCount,strTable);

}

catch (OleDbException ex)

{

ds = null;

m_strError = ex.ToString();

}

return ds;

}

/// <summary>

/// 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;

}

/// <summary>

/// 执行ExecuteScalar

/// </summary>

public int ExeScalar(string strSql)

{

int nCount = -1;

m_strError = "";

SqlCommand sqlCmd = new SqlCommand(strSql,m_sqlCnn);

try

{

OpenCnn();

nCount = (int)sqlCmd.ExecuteScalar();

}

catch (SqlException ex)

{

nCount = -1;

m_strError = ex.ToString();

}

finally

{

if (m_sqlCnn.State==ConnectionState.Open)

{

sqlCmd.Dispose();

m_sqlCnn.Close();

}

}

return nCount;

}

/// <summary>

/// 打开Connection

/// </summary>

private void OpenCnn()

{

if (m_sqlCnn.State==ConnectionState.Open)

{

m_sqlCnn.Close();

}

m_sqlCnn.Open();

}

/// <summary>

/// 返回DataSet

/// </summary>

public DataSet ExeSqlDs(SqlCommand sqlCmd, string strTable)

{

m_strError = "";

DataSet ds = new DataSet();

sqlCmd.Connection = m_sqlCnn;

SqlDataAdapter sqlAdapter = new SqlDataAdapter();

sqlAdapter.SelectCommand = sqlCmd;

try

{

sqlAdapter.Fill(ds,strTable);

}

catch (SqlException ex)

{

ds = null;

m_strError = ex.ToString();

}

return ds;

}

/// <summary>

/// 设定Connection 字符串,new Connection

/// </summary>

public void SetConnectionString(string strSource)

{

m_strCnn = strSource;

m_sqlCnn = null;

m_sqlCnn = new SqlConnection(m_strCnn);

}

/// <summary>

/// 错误信息

/// </summary>

private string m_strError;

/// <summary>

/// 错误信息

/// </summary>

public string StrErrorInfo

{

get

{

return m_strError;

}

}

}

}

 
 
 
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