用SqlDataAdapter填充DataSet和更新数据库

//用SqlDataAdapter填充DataSet和更新数据库
private SqlCommand cmd = new SqlCommand();
private SqlDataReader sdr = null;
private SqlDataAdapter sda = null;
private SqlCommandBuilder scb = null;
private DataSet ds = null;
#region ExecuteApdater 使用SQL查询语句填充一个DataSet并返回
/// <summary>
/// 使用SQL查询语句填充一个DataSet并返回
/// </summary>
/// <param name="cmdType">命令类型</param>
/// <param name="cmdText">SQL语句字符串</param>
/// <param name="tableName">指定表名（不指定表名时传null）</param>
/// <param name="parms">参数集合（没有参数时传null）</param>
/// <returns>DataSet</returns>
public DataSet ExecuteApdater(CommandType cmdType, string cmdText, string tableName, SqlParameter[] parms)
{
ds = new DataSet();
try
{
PrepareCommand(cmdType, cmdText, null, null);
sda = new SqlDataAdapter();
sda.SelectCommand = cmd;
scb = new SqlCommandBuilder(sda);
if (tableName != null)
{
sda.Fill(ds, tableName);
return ds;
}
sda.Fill(ds);
return ds;
}
catch (Exception ex)
{
throw ex;
}
}
public void ExecuteAdapterUpdate(string tableName)
{
try
{
sda.Update(ds.Tables[tableName]);
}
catch (Exception ex)
{
throw ex;
}
}
#endregion
#region PrepareCommand 命令预处理 为SqlCommand设置属性
/// <summary>
/// 命令预处理 为SqlCommand设置属性
/// </summary>
/// <param name="cmdType">命令类型</param>
/// <param name="cmdText">SQL语句查询字符串</param>
/// <param name="parms">参数集合（没有参数时传null）</param>
/// <param name="trans">事务</param>
private void PrepareCommand(CommandType cmdType, string cmdText, SqlParameter[] parms, SqlTransaction trans)
{
cmd.Connection = GetConn();
cmd.CommandText = cmdText;
cmd.CommandType = cmdType;
if (trans != null)
cmd.Transaction = trans;
if (parms != null)
{
foreach (SqlParameter parm in parms)
cmd.Parameters.Add(parm);
//cmd.Parameters.AddRange(parms);
}
}
#endregion