private void AddColBtn_Click(object sender, EventArgs e)
{
string table_name = TblNameTxt.Text;
string colomun_name = CNameTxt.Text;
string data_type = DTypeCBox.SelectedItem.ToString();
string type_constraint = ConsCBox.SelectedItem.ToString();
string constraint = ConsTxt.Text;
bool p_key = PKCheckBox.Checked;
Table table_gui = new Table(table_name);
DataTable table = new DataTable();
DataColumn[] key = new DataColumn[1];
DataColumn column = new DataColumn();
column.DataType = System.Type.GetType("System." + data_type);
column.ColumnName = colomun_name;
table.Columns.Add(column);
key[0] = column;
if (p_key == true)
{
table.PrimaryKey = key;
}
if (!File.Exists("Tables.xml"))
{
XmlWriter writer = XmlWriter.Create("Tables.xml");
//start
writer.WriteStartDocument();
writer.WriteStartElement("Tables");
writer.WriteStartElement("Table");
writer.WriteAttributeString("name", table_name);
writer.WriteStartElement("Columns");
writer.WriteStartElement("column");
writer.WriteStartElement("Name");
writer.WriteString(colomun_name);
writer.WriteEndElement();
writer.WriteStartElement("data_type");
writer.WriteString(data_type);
writer.WriteEndElement();
writer.WriteStartElement("Primary_key");
if (p_key)
{
writer.WriteString("true");
}
else
{
writer.WriteString("false");
}
writer.WriteEndElement();
writer.WriteStartElement("Constarints");
writer.WriteString(type_constraint + " " + constraint);
writer.WriteEndElement();
writer.WriteStartElement("Foreign_keys");
writer.WriteEndElement();
writer.WriteStartElement("rows");
writer.WriteEndElement();
//<column>
writer.WriteEndElement();
//<columns>
writer.WriteEndElement();
//<table>
writer.WriteEndElement();
//<tables>
writer.WriteEndElement();
//end
writer.WriteEndDocument();
writer.Close();
MessageBox.Show("Table is Added!");
Home h = new Home();
this.ParentForm.Controls.Add(h);
h.Show();
h.BringToFront();
h.Dock = DockStyle.Fill;
}
else
{
XmlDocument doc = new XmlDocument();
doc.Load("Tables.xml");
XmlNodeList list_tables = doc.SelectNodes("//Table[@name='" + table_name + "']");
if (list_tables.Count > 0)
{
try
{
XmlNode col = list_tables[0].SelectSingleNode("Columns").AppendChild(doc.CreateElement("column"));
XmlElement dt = doc.CreateElement("Name");
dt.InnerText = colomun_name;
col.AppendChild(dt);
dt = doc.CreateElement("data_type");
dt.InnerText = data_type;
col.AppendChild(dt);
dt = doc.CreateElement("Primary_key");
if (p_key)
{
dt.InnerText = "true";
}
else
{
dt.InnerText = "false";
}
col.AppendChild(dt);
dt = doc.CreateElement("Constraints");
dt.InnerText = type_constraint + " " + constraint;
col.AppendChild(dt);
dt = doc.CreateElement("Foreign_keys");
col.AppendChild(dt);
dt = doc.CreateElement("rows");
col.AppendChild(dt);
doc.Save("Tables.xml");
MessageBox.Show("Column is Added!");
string tname = Home.tableName;
Home h = new Home();
this.ParentForm.Controls.Add(h);
h.Show();
h.BringToFront();
h.Dock = DockStyle.Fill;
h.TblCBox.SelectedItem = tname;
h.Display_data();
}
catch (Exception ex)
{
MessageBox.Show("Table already exist !");
}
}
else
{
XmlNode node = doc.DocumentElement;
XmlElement tablee = doc.CreateElement("Table");
tablee.SetAttribute("name", table_name);
XmlElement cols = doc.CreateElement("Columns");
XmlElement col = doc.CreateElement("column");
XmlElement dt = doc.CreateElement("Name");
dt.InnerText = colomun_name;
col.AppendChild(dt);
dt = doc.CreateElement("data_type");
dt.InnerText = data_type;
col.AppendChild(dt);
dt = doc.CreateElement("Primary_key");
if (p_key)
{
dt.InnerText = "true";
}
else
{
dt.InnerText = "false";
}
col.AppendChild(dt);
dt = doc.CreateElement("Constraints");
dt.InnerText = type_constraint + " " + constraint;
col.AppendChild(dt);
dt = doc.CreateElement("Foreign_keys");
col.AppendChild(dt);
dt = doc.CreateElement("rows");
col.AppendChild(dt);
cols.AppendChild(col);
tablee.AppendChild(cols);
node.AppendChild(tablee);
MessageBox.Show("Table is Added!");
doc.Save("Tables.xml");
Home h = new Home();
this.ParentForm.Controls.Add(h);
h.Show();
h.BringToFront();
h.Dock = DockStyle.Fill;
}
}
}
