步步为营 .NET三层架构解析 三、SQLHelper设计
数据库设计好了,我们开始设计SQLHelper了,是一个SQL基类.
连接数据源:
private SqlConnection myConnection = null;
private readonly string RETURNVALUE = "RETURNVALUE";打开数据库连接.
private void Open()
{
// 打开数据库连接
if (myConnection == null)
{
// myConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
myConnection = new SqlConnection(ConfigurationManager.AppSettings["ConnectionString"].ToString());
}
if (myConnection.State == ConnectionState.Closed)
{
try
{
///打开数据库连接
myConnection.Open();
}
catch (Exception ex)
{
SystemError.CreateErrorLog(ex.Message);
}
finally
{
///关闭已经打开的数据库连接
}
}
}关闭数据库连接
public void Close()
{
///判断连接是否已经创建
if (myConnection != null)
{
///判断连接的状态是否打开
if (myConnection.State == ConnectionState.Open)
{
myConnection.Close();
}
}
}释放资源
public void Dispose()
{
// 确认连接是否已经关闭
if (myConnection != null)
{
myConnection.Dispose();
myConnection = null;
}
}执行无参数和返回int型的存储过程
public int RunProc(string procName)
{
SqlCommand cmd = CreateProcCommand(procName, null);
try
{
///执行存储过程
cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
///记录错误日志
SystemError.CreateErrorLog(ex.Message);
}
finally
{
///关闭数据库的连接
Close();
}///返回存储过程的参数值
return (int)cmd.Parameters[RETURNVALUE].Value;
}执行传入参数和返回int型的存储过程
public int RunProc(string procName, SqlParameter[] prams)
{
SqlCommand cmd = CreateProcCommand(procName, prams);
try
{
///执行存储过程
cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
///记录错误日志
SystemError.CreateErrorLog(ex.Message);
}
&n
补充：Web开发 , ASP.Net ,
