private bool Addnew(PresetDCVoltage vo)
{
using (OleDbConnection conn = CreateConnection())
{
OleDbTransaction trans = conn.BeginTransaction();
try
{
StringBuilder sql = new StringBuilder();
StringBuilder param = new StringBuilder();
sql.Append("INSERT INTO PresetDCVoltage (");
param.Append(" VALUES (");
sql.Append(" DCVoltagePreSet");
param.Append("").Append(Convert.ToInt32(vo.DCVoltagePreSet) * -1).Append("");
sql.Append(")").Append(param).Append(");");
OleDbCommand insertcmd = new OleDbCommand(sql.ToString(), conn);
insertcmd.ExecuteNonQuery();
entryDAL.Addnew(vo.Entries, conn, vo.ID);
trans.Commit();
}
catch (Exception e)
{
trans.Rollback();
ResetConn();
throw e;
}
}
ResetConn();
return true;
}
private bool LoadData(PresetDCVoltage vo)
{
using (OleDbConnection conn = CreateConnection())
{
string sql = "Select * from PresetDCVoltage ";
if (vo.ID != -1)
{
sql += "where ID = " + vo.ID;
}
OleDbCommand myCommand = new OleDbCommand(sql, conn);
OleDbDataReader reader = myCommand.ExecuteReader(); //执行command并得到相应的DataReader
if (reader.Read())
{
fillVOData(vo, reader);
entryDAL.QueryData(vo.Entries, conn, vo.ID);
ResetConn();
}
else
{
ResetConn();
return false;
}
}
return true;
}
private void fillVOData(PresetDCVoltage vo, OleDbDataReader reader)
{
vo.ID = (Int32)reader["ID"];
vo.DCVoltagePreSet = Convert.ToBoolean(reader["RecTapStep"]);
}
private bool UpdateOrAddnew(PresetDCVoltage vo)
{
if (!queryExists(vo))
{
return Addnew(vo);
}
else
{
return Update(vo);
}
}
private bool Update(PresetDCVoltage vo)
{
StringBuilder sql = new StringBuilder();//当时在这里定义，是为了在出现异常的时候看看我的SQL语句是否正确
using (OleDbConnection conn = CreateConnection())
{
OleDbTransaction trans = conn.BeginTransaction();
try
{
sql.Append("UPDATE PresetDCVoltage SET DCVoltagePreSet=").Append(Convert.ToInt32(vo.DCVoltagePreSet) * -1);
sql.Append(" WHERE ID = ").Append(vo.ID);
//定义command对象，并执行相应的SQL语句
OleDbCommand myCommand = new OleDbCommand(sql.ToString(), conn);
myCommand.ExecuteNonQuery(); //执行SELECT的时候我们是用的ExecuteReader()
entryDAL.Update(vo.Entries, conn, vo.ID);
trans.Commit();
}
catch (Exception e)
{
trans.Rollback();
ResetConn();
throw e;
}
}
ResetConn();
return true;
}
