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作者： unknow

using System;
using System.Data;
using System.Data.SqlClient;

namespace SysClassLibrary
{
/// <summary>
/// DataAccess 的摘要说明。
/// <description>数据处理基类,调用方式：DataAccess.DataSet((string)sqlstr);或者DataAccess.DataSet((string)sqlstr,ref DataSet ds); </description>
/// </summary>
public class DataAccess
{
#region 属性
protected static SqlConnection conn=new SqlConnection();
protected static SqlCommand comm=new SqlCommand();
#endregion
public DataAccess()
{
//init();
}
#region 内部函数 静态方法中不会执行DataAccess()构造函数

/// <summary>
/// 打开数据库连接
/// </summary>
private static void openConnection()
{
if (conn.State == ConnectionState.Closed)
{
//SysConfig.ConnectionString 为系统配置类中连接字符串，如："server=localhost;database=databasename;uid=sa;pwd=;"

conn.ConnectionString = SysConfig.ConnectionString ;
comm.Connection =conn;
try
{
conn.Open();
}
catch(Exception e)
{
throw new Exception(e.Message);
}
}
}
/// <summary>
/// 关闭当前数据库连接
/// </summary>
private static void closeConnection()
{
if(conn.State == ConnectionState.Open)
conn.Close();
conn.Dispose();
comm.Dispose();
}
#endregion
/// <summary>
/// 执行Sql查询语句
/// </summary>
/// <param name="sqlstr">传入的Sql语句</param>
public static void ExecuteSql(string sqlstr)
{
try
{
openConnection();
comm.CommandType =CommandType.Text ;
comm.CommandText =sqlstr;
comm.ExecuteNonQuery();
}
catch(Exception e)
{
throw new Exception(e.Message);
}
finally
{
closeConnection();
}
}

/// <summary>
/// 执行存储过程
/// </summary>
/// <param name="procName">存储过程名</param>
/// <param name="coll">SqlParameters 集合</param>
public static void ExecutePorcedure(string procName,SqlParameter[] coll)
{
try
{
openConnection();
for(int i=0;i<coll.Length;i++)
{
comm.Parameters .Add(coll[i]);
}
comm.CommandType=CommandType.StoredProcedure ;
comm.CommandText =procName;
comm.ExecuteNonQuery();
}
catch(Exception e)
{
throw new Exception(e.Message);
}
finally
{
comm.Parameters.Clear();
closeConnection();
}
}

/// <summary>
/// 执行存储过程并返回数据集
/// </summary>
/// <param name="procName">存储过程名称</param>
/// <param name="coll">SqlParameter集合</param>
/// <param name="ds">DataSet </param>
public static void ExecutePorcedure(string procName,SqlParameter[] coll,ref DataSet ds)
{
try
{
SqlDataAdapter da=new SqlDataAdapter();
openConnection();
for(int i=0;i<coll.Length;i++)
{
comm.Parameters .Add(coll[i]);
}
comm.CommandType=CommandType.StoredProcedure ;
comm.CommandText =procName;

da.SelectCommand =comm;
da.Fill(ds);
}
catch(Exception e)
{
throw new Exception(e.Message);
}
finally
{
comm.Parameters.Clear();
closeConnection();
}
}

/// <summary>
/// 执行Sql查询语句并返回第一行的第一条记录,返回值为object 使用时需要拆箱操作 -> Unbox
/// </summary>
/// <param name="sqlstr">传入的Sql语句</param>
/// <returns>object 返回值 </returns>
public static object ExecuteScalar(string sqlstr)
{
object obj=new object();
try
{
openConnection();
comm.CommandType =CommandType.Text ;
comm.CommandText =sqlstr;
obj=comm.ExecuteScalar();
}
catch(Exception e)
{
throw new Exception(e.Message);
}
finally
{
closeConnection();
}
return obj;
}

/// <summary>
/// 执行Sql查询语句,同时进行事务处理
/// </summary>
/// <param name="sqlstr">传入的Sql语句</param>
public static void ExecuteSqlWithTransaction(string sqlstr)
{
SqlTransaction trans ;
trans=conn.BeginTransaction();
comm.Transaction =trans;
try
{
openConnection();
comm.CommandType =CommandType.Text ;
comm.CommandText =sqlstr;
comm.ExecuteNonQuery();
trans.Commit();
}
catch
{
trans.Rollback();
}
finally
{
closeConnection();
}
}

/// <summary>
/// 返回指定Sql语句的SqlDataReader，请注意，在使用后请关闭本对象，同时将自动调用closeConnection()来关闭数据库连接
/// 方法关闭数据库连接
/// </summary>
/// <param name="sqlstr">传入的Sql语句</param>
/// <returns>SqlDataReader对象</returns>
public static SqlDataReader dataReader(string sqlstr)
{
SqlDataReader dr=null;
try
{
openConnection();
comm.CommandText =sqlstr;
comm.CommandType =CommandType.Text ;
dr=comm.ExecuteReader(CommandBehavior.CloseConnection);
}
catch
{
try
{
dr.Close();
closeConnection();
}
catch
{
}
}
return dr;
}
/// <summary>
/// 返回指定Sql语句的SqlDataReader，请注意，在使用后请关闭本对象，同时将自动调用closeConnection()来关闭数据库连接
/// 方法关闭数据库连接
/// </summary>
/// <param name="sqlstr">传入的Sql语句</param>
/// <param name="dr">传入的ref DataReader 对象</param>
public static void dataReader(string sqlstr,ref SqlDataReader dr)
{
try
{
openConnection();
comm.CommandText =sqlstr;
comm.CommandType =CommandType.Text ;
dr=comm.ExecuteReader(CommandBehavior.CloseConnection);
}
catch
{
try
{
if(dr!=null && !dr.IsClosed)
dr.Close();
}
catch
{
}
finally
{
closeConnection();
}
}
}


/// <summary>
/// 返回指定Sql语句的DataSet
/// </summary>
/// <param name="sqlstr">传入的Sql语句</param>
/// <returns>DataSet</returns>
public static DataSet dataSet(string sqlstr)
{
DataSet ds= new DataSet();
SqlDataAdapter da=new SqlDataAdapter();
try
{
openConnection();
comm.CommandType =CommandType.Text ;
comm.CommandText =sqlstr;
da.SelectCommand =comm;
da.Fill(ds);
}
catch(Exception e)
{
throw new Exception(e.Message);
}
finally
{
closeConnection();
}
return ds;
}

/// <summary>
/// 返回指定Sql语句的DataSet
/// </summary>
/// <param name="sqlstr">传入的Sql语句</param>
/// <param name="ds">传入的引用DataSet对象</param>
public static void dataSet(string sqlstr,ref DataSet ds)
{
SqlDataAdapter da=new SqlDataAdapter();
try
{
openConnection();
comm.CommandType =CommandType.Text ;
comm.CommandText =sqlstr;
da.SelectCommand =comm;
da.Fill(ds);
}
catch(Exception e)
{
throw new Exception(e.Message);
}
finally
{
closeConnection();
}
}
/// <summary>
/// 返回指定Sql语句的DataTable
/// </summary>
/// <param name="sqlstr">传入的Sql语句</param>
/// <returns>DataTable</returns>
public static DataTable dataTable(string sqlstr)
{
SqlDataAdapter da=new SqlDataAdapter();
DataTable datatable=new DataTable();
try
{
openConnection();
comm.CommandType =CommandType.Text ;
comm.CommandText =sqlstr;
da.SelectCommand =comm;
da.Fill(datatable);
}
catch(Exception e)
{
throw new Exception(e.Message);
}
finally
{
closeConnection();
}
return datatable;
}

/// <summary>
/// 执行指定Sql语句,同时给传入DataTable进行赋值
/// </summary>
/// <param name="sqlstr">传入的Sql语句</param>
/// <param name="dt">ref DataTable dt </param>
public static void dataTable(string sqlstr,ref DataTable dt)
{
SqlDataAdapter da=new SqlDataAdapter();
try
{
openConnection();
comm.CommandType =CommandType.Text ;
comm.CommandText =sqlstr;
da.SelectCommand =comm;
da.Fill(dt);
}
catch(Exception e)
{
throw new Exception(e.Message);
}
finally
{
closeConnection();
}
}
/// <summary>
/// 执行带参数存储过程并返回数据集合
/// </summary>
/// <param name="procName">存储过程名称</param>
/// <param name="parameters">SqlParameterCollection 输入参数</param>
/// <returns></returns>
public static DataTable dataTable(string procName,SqlParameterCollection parameters)
{
SqlDataAdapter da=new SqlDataAdapter();
DataTable datatable=new DataTable();
try
{
openConnection();
comm.Parameters.Clear();
comm.CommandType=CommandType.StoredProcedure ;
comm.CommandText =procName;
foreach(SqlParameter para in parameters)
{
SqlParameter p=(SqlParameter)para;
comm.Parameters.Add(p);
}
da.SelectCommand =comm;
da.Fill(datatable);
}
catch(Exception e)
{
throw new Exception(e.Message);
}
finally
{
closeConnection();
}
return datatable;
}

public static DataView dataView(string sqlstr)
{
SqlDataAdapter da=new SqlDataAdapter();
DataView dv=new DataView();
DataSet ds=new DataSet();
try
{
openConnection();
comm.CommandType=CommandType.Text;
comm.CommandText =sqlstr;
da.SelectCommand =comm;
da.Fill(ds);
dv=ds.Tables[0].DefaultView;
}
catch(Exception e)
{
throw new Exception(e.Message);
}
finally
{
closeConnection();
}
return dv;
}
}


}