private void buttonDeleteTable_Click(object sender, EventArgs e)
{
DataBase mData = new DataBase("prime_db");
DataBase userDB = new DataBase(currentDB);
mData.OpenConnection();
bool flag = false;
try
{
userDB.OpenConnection();
MySqlCommand commandCreate = new MySqlCommand($"DROP TABLE IF EXISTS {comboBoxTables.Text}", userDB.GetConnection());
commandCreate.ExecuteNonQuery();
}
catch (MySqlException ex)
{
flag = true;
MessageBox.Show($"Не получилось произвести удаление таблицы {comboBoxTables.Text}. Попробуйте сначала удалить зависимости");
}
if (!flag)
{
MySqlCommand commandIns = new MySqlCommand($"DELETE FROM `table` WHERE Name = \"{comboBoxTables.Text}\"", mData.GetConnection());
commandIns.ExecuteNonQuery();
MessageBox.Show($"Таблица {comboBoxTables.Text} успешно удалена!");
}
DBChangeForm form = new DBChangeForm(currentDB);
form.Show();
this.Hide();
}
private void DeleteAttrButton_Click(object sender, EventArgs e)
{
DataBase mData = new DataBase("prime_db");
DataBase userDB = new DataBase(currentDB);
string deopAttrName = AllAttrsListBox.SelectedItem.ToString();
string sourceName = GetTableName(GetSourceId(deopAttrName));
bool flag = false;
mData.OpenConnection();
userDB.OpenConnection();
try
{
MySqlCommand altCom = new MySqlCommand($"ALTER TABLE `{sourceName}` DROP COLUMN `{deopAttrName}`", userDB.GetConnection());
altCom.ExecuteNonQuery();
}catch (MySqlException ex)
{
flag = true;
MessageBox.Show($"Не удалось произвести удаление атрибута {deopAttrName}");
}
if (!flag)
{
MySqlCommand com = new MySqlCommand($"DELETE FROM `attribute` WHERE Attribute_Name = \"{deopAttrName}\"", mData.GetConnection());
com.ExecuteNonQuery();
MessageBox.Show($"Удаление атрибута {deopAttrName} выполнено!");
DBChangeForm form = new DBChangeForm(currentDB);
form.Show();
this.Hide();
}
}
private void buttonBack_Click(object sender, EventArgs e)
{
DBChangeForm form = new DBChangeForm(currentDB, tableName);
form.Show();
this.Hide();
}
private void buttonChangeDB_Click(object sender, EventArgs e)
{
DBChangeForm form = new DBChangeForm(currentDB);
form.Show();
this.Hide();
}
private void buttonCreateTable_Click(object sender, EventArgs e)
{
DataBase mData = new DataBase("prime_db");
DataBase userDB = new DataBase(currentDB);
mData.OpenConnection();
DataTable table = GetTable(mData);
int nextID;
if (table.Rows.Count > 0)
{
nextID = UnicID(table);
}
else
{
nextID = 1;
}
MySqlCommand commandIns = new MySqlCommand($"INSERT INTO `table` (Table_ID,Name,Description) VALUES ({nextID},\"{tableName}\",\"{richTextBox1.Text}\")", mData.GetConnection());
commandIns.ExecuteNonQuery();
userDB.OpenConnection();
MySqlCommand commandCreate = new MySqlCommand($@"
CREATE TABLE {tableName}
(I_D INT NOT NULL)", userDB.GetConnection());
commandCreate.ExecuteNonQuery();
DBChangeForm form = new DBChangeForm(currentDB);
form.Show();
this.Hide();
MessageBox.Show($"Таблица {tableName} успешно добавлена!");
}
private void DeleteConnectionButton_Click(object sender, EventArgs e)
{
DataBase mData = new DataBase("prime_db");
DataBase userDate = new DataBase(currentDB);
string[] fkey = ConnectionsListBox.SelectedItem.ToString().Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
int connID = Convert.ToInt32(fkey[0]);
string connName = GetConnectionName(connID);
string fKeyAttrName = fkey[1];
string depTName = GetTableName(GetSourceId(fKeyAttrName));
mData.OpenConnection();
userDate.OpenConnection();
bool flag = false;
try
{
MySqlCommand com = new MySqlCommand($"ALTER TABLE `{depTName}` DROP FOREIGN KEY {connName}", userDate.GetConnection());
com.ExecuteNonQuery();
}catch (MySqlException ex)
{
flag = true;
MessageBox.Show("Не получилось удалить связь");
}
if (!flag)
{
MySqlCommand remEntCom = new MySqlCommand($"DELETE FROM `connection` WHERE Connection_ID = {connID}", mData.GetConnection());
remEntCom.ExecuteNonQuery();
MessageBox.Show("Удаление внешнего ключа выполнено успешно!");
DBChangeForm form = new DBChangeForm(currentDB);
form.Show();
this.Hide();
}
}
private void CreateAttrButton_Click(object sender, EventArgs e)
{
DataBase mData = new DataBase("prime_db");
DataBase userDB = new DataBase(currentDB);
int tID = GetTableID(tableName);
int UniqueValue = 0;
int KeyValue = 0;
int CanNullValue = 0;
if (UniqueCheckBox.Checked)
{
UniqueValue = 1;
}
if (CanNullCheckBox.Checked)
{
CanNullValue = 1;
}
string attrName = AttrNametextBox.Text;
string type = TypescomboBox.Text;
string strValue = StartValueTextBox.Text;
string desc = richTextBox1.Text;
#region CreateAttr
bool flag = false;
MySqlCommand altCom;
try
{
userDB.OpenConnection();
string nullDef = "NULL";
if (CanNullValue == 0)
{
nullDef = "Not Null";
}
altCom = new MySqlCommand($"ALTER TABLE `{tableName}` ADD COLUMN {attrName} {type} {nullDef}", userDB.GetConnection());
altCom.ExecuteNonQuery();
if (UniqueValue == 1)
{
altCom = new MySqlCommand($"ALTER TABLE `{tableName}` ADD CONSTRAINT {attrName}_un_const UNIQUE ({attrName})", userDB.GetConnection());
altCom.ExecuteNonQuery();
}
}catch (MySqlException)
{
flag = true;
MessageBox.Show("Не получилось добавить новый атрибут");
}
try
{
altCom = new MySqlCommand($"ALTER TABLE `{tableName}` DROP COLUMN `I_D`", userDB.GetConnection());
altCom.ExecuteNonQuery();
}
catch (MySqlException ex)
{
//Игнорируем, если удаление уже производилось
}
#endregion
if (!flag)
{
#region InsertIntoPrime
mData.OpenConnection();
DataTable table = GetTable(mData);
int nextID;
if (table.Rows.Count > 0)
{
nextID = UnicID(table);
}
else
{
nextID = 1;
}
MySqlCommand commandIns = new MySqlCommand($"INSERT INTO `attribute` (Attribute_ID,Attribute_Name,Type,Start_Value,Is_Unique,Is_Key,Can_Null,Description,Table_ID) VALUES ({nextID},\"{attrName}\",\"{type}\",\"{strValue}\",{UniqueValue},{KeyValue},{CanNullValue},\"{desc}\",{tID})", mData.GetConnection());
commandIns.ExecuteNonQuery();
mData.CloseConnection();
#endregion
if (strValue != "")
{
try
{
userDB.OpenConnection();
switch (type)
{
case ("Int"):
{
MySqlCommand defCom = new MySqlCommand($"ALTER TABLE `{tableName}` ALTER COLUMN `{attrName}` SET DEFAULT {strValue} ", userDB.GetConnection());
defCom.ExecuteNonQuery();
break;
}
default:
{
MySqlCommand defCom = new MySqlCommand($"ALTER TABLE `{tableName}` ALTER COLUMN `{attrName}` SET DEFAULT '{strValue}' ", userDB.GetConnection());
defCom.ExecuteNonQuery();
break;
}
}
}
catch (MySqlException ex)
{
MessageBox.Show($"Значение по умолчанию введено некорректно. Атрибут {attrName} добавлен без значения по умолчанию.");
DBChangeForm tform = new DBChangeForm(currentDB, tableName);
tform.Show();
this.Hide();
return;
}
}
DBChangeForm form = new DBChangeForm(currentDB, tableName);
form.Show();
this.Hide();
MessageBox.Show($"Атрибут {attrName} успешно добавлен!");
}
else
{
DBChangeForm form = new DBChangeForm(currentDB, tableName);
form.Show();
this.Hide();
}
}