void EntryUpdate()
{
int FID;
int FParentID;
DateTime FUpdateTime;
int FSeqNo;
// ID check.
if (string.IsNullOrEmpty(txtFID.Text))
{
MessageBox.Show("ID is empty.");
return;
}
if (!int.TryParse(txtFID.Text, out FID))
{
MessageBox.Show("ID is not a integer value.");
return;
}
// Fields check.
if (string.IsNullOrEmpty(lblFUpdateTime.Text))
{
MessageBox.Show("Update time is empty.");
return;
}
if (!lblFUpdateTime.Text.ZParseTime_MsDash(out FUpdateTime))
{
MessageBox.Show("Update time is not a valid datetime value.");
return;
}
FParentID = -1;
if (string.IsNullOrEmpty(txtFParentID.Text))
{
MessageBox.Show("Parent ID is empty.");
return;
}
else
{
if (!int.TryParse(txtFParentID.Text, out FParentID))
{
MessageBox.Show("Parent ID is not an integer.");
return;
}
}
FSeqNo = -1;
if (!string.IsNullOrEmpty(txtFSeqNo.Text))
{
if (!int.TryParse(txtFSeqNo.Text, out FSeqNo))
{
MessageBox.Show("SeqNo is not an integer.");
return;
}
}
// IO Check.
DataRow row1 = DBReadRow_ID(FID);
if (row1 == null)
{
MessageBox.Show($"Record does not exist. ID={FID}.");
return;
}
string sFUpdateTime_DB = row1["FUpdateTime"].ZToDateTime().ZToString_MsDash();
if (lblFUpdateTime.Text != sFUpdateTime_DB)
{
MessageBox.Show($"Someone else may change the record already. ID={FID}, Last Update Time={lblFUpdateTime.Text}");
return;
}
Boolean bKeyChanged = false;
long FParentID_DB = row1["FParentID"].ZToLong();
string FKey_DB = row1["FKey"].ZToString();
if (FParentID != FParentID_DB)
{
bKeyChanged = true;
}
if (txtFKey.Text != FKey_DB)
{
bKeyChanged = true;
}
if (bKeyChanged)
{
if (!DBExistParentID(FParentID))
{
MessageBox.Show($"Parent record does not exist. ParentID={FParentID}.");
return;
}
// You can skip the validation if DB. supports unique index.
if (DBExistParentIDAndKey(FParentID, txtFKey.Text))
{
MessageBox.Show($"Record exists. ParentID={FParentID}, Key={txtFKey.Text}");
return;
}
if (DBExistChild(FID))
{
MessageBox.Show($"Parent record can not update (ParentID and Key) fields if any child record exists. ID={FID}");
return;
}
}
// IO Action.
int iAffected = 0;
string sCmd = "Update TConfig set FParentID=@FParentID, FSeqNo=@FSeqNo, FKey=@FKey, FValue=@FValue, FValueB=@FValueB, FReadonly=@FReadonly, FNote=@FNote, FUpdateTime=(datetime('now', 'localtime')) where FID=@FID and FUpdateTime=@FUpdateTime";
try
{
using (SQLiteConnection cn1 = new SQLiteConnection(_sConnectionString))
using (SQLiteCommand command = cn1.CreateCommand())
{
command.CommandText = sCmd;
command.Parameters.AddWithValue("@FParentID", FParentID.ZToObject_DBNull());
command.Parameters.AddWithValue("@FSeqNo", FSeqNo.ZToObject_DBNull());
command.Parameters.AddWithValue("@FKey", txtFKey.Text.ZToObject_DBNull());
command.Parameters.AddWithValue("@FValue", txtFValue.Text.ZToObject_DBNull());
command.Parameters.AddWithValue("@FValueB", txtFValueB.Text.ZToObject_DBNull());
command.Parameters.AddWithValue("@FReadonly", chkReadonly.Checked.ZToObject_DBNull());
command.Parameters.AddWithValue("@FNote", txtFNote.Text.ZToObject_DBNull());
command.Parameters.AddWithValue("@FID", FID.ZToObject_DBNull());
command.Parameters.AddWithValue("@FUpdateTime", FUpdateTime.ZToObject_DBNull());
cn1.Open();
iAffected = command.ExecuteNonQuery();
}
}
catch (Exception e1)
{
MessageBox.Show(e1.Message);
return;
}
if (iAffected != 1)
{
MessageBox.Show("Fail.");
return;
}
myLoadKeyList();
MessageBox.Show("OK.");
}
