C#访问数据库的基类

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

/// <summary>
/// Class1 的摘要说明
/// </summary>
public class DataAccess
{
#region 申明私有变量;
private SqlConnection sqlConn;
#endregion

#region 构造函数
public DataAccess(string connectionString)
{
if (sqlConn == null)
{
sqlConn = new SqlConnection(connectionString);
}
}

public DataAccess()
{
string connectionString = System.Configuration.ConfigurationSettings.AppSettings["SqlConn"];
if (sqlConn == null)
{
sqlConn = new SqlConnection(connectionString);
}
}
#endregion

#region 生成SqlCommand
private SqlCommand BuildCommand(string sen, CommandType Type)
{
SqlCommand command = new SqlCommand();
command.Connection = sqlConn;
command.CommandText = sen;
command.CommandType = Type;
return command;
}
private SqlCommand BuildCommand(string sen, CommandType Type, SqlParameter[] parameters)
{
SqlCommand command = new SqlCommand();

command.Connection = sqlConn;
command.CommandText = sen;
command.CommandType = Type;

foreach (SqlParameter parameter in parameters)
{
command.Parameters.Add(parameter);
}
return command;
}
public SqlCommand BuildQueryCommand(string ProcedureName, IDataParameter[] parameters)
{
SqlCommand command = new SqlCommand(ProcedureName, sqlConn);
command.CommandType = CommandType.StoredProcedure;
foreach (SqlParameter parameter in parameters)
{
command.Parameters.Add(parameter);
}
return command;
}
#endregion

#region 运行存储过程，对数据表进行操作
public void RunProcedure(string ProcedureName)
{
SqlCommand command = BuildCommand(ProcedureName, CommandType.StoredProcedure);

sqlConn.Open();
command.ExecuteNonQuery();
sqlConn.Close();

command.Dispose();
}
public void RunProcedure(string ProcedureName, SqlParameter[] parameters)
{
SqlCommand command = BuildCommand(ProcedureName, CommandType.StoredProcedure, parameters);

sqlConn.Open();
command.ExecuteNonQuery();
sqlConn.Close();

command.Dispose();
}

public SqlDataReader RunProcedureReader(string ProcedureName, IDataParameter[] parameters)
{
SqlDataReader returnReader;

sqlConn.Open();
SqlCommand command = BuildQueryCommand(ProcedureName, parameters);
command.CommandType = CommandType.StoredProcedure;

returnReader = command.ExecuteReader();
return returnReader;
}

public int RunProcedureToValue(string ProcedureName)
{
SqlCommand command = BuildCommand(ProcedureName, CommandType.StoredProcedure);

command.Parameters.Add(new SqlParameter("ReturnValue", SqlDbType.Int, 4, ParameterDirection.ReturnValue,
false, 0, 0, string.Empty, DataRowVersion.Default, null));

sqlConn.Open();
command.ExecuteNonQuery();
int result = (int)command.Parameters["ReturnValue"].Value;
sqlConn.Close();

command.Dispose();
return result;
}
public int RunProcedureToValue(string ProcedureName, SqlParameter[] parameters)
{
SqlCommand command = BuildCommand(ProcedureName, CommandType.StoredProcedure, parameters);

command.Parameters.Add(new SqlParameter("ReturnValue", SqlDbType.Int, 4, ParameterDirection.ReturnValue,
false, 0, 0, string.Empty, DataRowVersion.Default, null));

sqlConn.Open();
command.ExecuteNonQuery();
int result = (int)command.Parameters["ReturnValue"].Value;
sqlConn.Close();

command.Dispose();

return result;
}

public DataSet RunProcedureToDs(string ProcedureName)
{
DataSet ds = new DataSet();
SqlCommand command = BuildCommand(ProcedureName, CommandType.StoredProcedure);
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(command);

sqlConn.Open();
sqlDataAdapter.Fill(ds);
sqlConn.Close();

command.Dispose();
sqlDataAdapter.Dispose();

return ds;
}
public DataSet RunProcedureToDs(string ProcedureName, SqlParameter[] parameters)
{
DataSet ds = new DataSet();
SqlCommand command = BuildCommand(ProcedureName, CommandType.StoredProcedure, parameters);
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(command);

sqlConn.Open();
sqlDataAdapter.Fill(ds);
sqlConn.Close();

command.Dispose();
sqlDataAdapter.Dispose();

return ds;
}

public DataTable RunProcedureToDt(string ProcedureName)
{
DataTable dt = new DataTable();
SqlCommand command = BuildCommand(ProcedureName, CommandType.StoredProcedure);
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(command);

sqlConn.Open();
sqlDataAdapter.Fill(dt);
sqlConn.Close();

command.Dispose();
sqlDataAdapter.Dispose();

return dt;
}
public DataTable RunProcedureToDt(string ProcedureName, SqlParameter[] parameters)
{
DataTable dt = new DataTable();
SqlCommand command = BuildCommand(ProcedureName, CommandType.StoredProcedure, parameters);
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(command);

sqlConn.Open();
sqlDataAdapter.Fill(dt);
sqlConn.Close();

command.Dispose();
sqlDataAdapter.Dispose();

return dt;
}
#endregion

#region 运行SQL语句，对数据表进行操作
public void RunSql(string Sqlsen)
{
SqlCommand command = BuildCommand(Sqlsen, CommandType.Text);
command.Connection = sqlConn;

sqlConn.Open();
command.ExecuteNonQuery();
sqlConn.Close();

command.Dispose();
}
public DataSet RunSqlToDs(string Sqlsen)
{
SqlCommand command = BuildCommand(Sqlsen, CommandType.Text);
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();
DataSet ds = new DataSet();

command.Connection = sqlConn;
sqlDataAdapter.SelectCommand = command;

sqlConn.Open();
sqlDataAdapter.Fill(ds);
sqlConn.Close();

command.Dispose();
sqlDataAdapter.Dispose();

return ds;
}
#endregion
}