private void btnQuery_Click(object sender, EventArgs e)
{
try
{
if (!CheckArgsIsOK())
{
return;
}
if (_db == null)
{
_db = DBConnect.GetInstance();//创建数据库连接
}
ConcatSQL cSql = new ConcatSQL();
cSql.ConcatSQLByUIControls(_ui);//根据界面条件生成相应的sql语句；
if (dr == null)
{
dr = new DataReader(_ui, _db, dataGridViewDay, dataGridViewPeriod);//创建查询结果的识别语句，并把结果输出到gridview
}
_db.OpenConnection();
_db.Retrieval(cSql.Sql, dr.DataReaderImplementation);//执行查询
_db.CloseConnection();
}
catch (System.Exception ex)
{
MessageBox.Show(ex.Message);
}
}