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using ScriptEngine.Machine;
using System;
using ScriptEngine.Machine.Contexts;
using System.Data.SqlClient;
using System.Data.Common;
using System.Data;
using System.Data.SQLite;
using MySql.Data.MySqlClient;
using Npgsql;
namespace OScriptSql
{
/// <summary>
/// Соединение с БД. Используется для указания источника данных объекта Запрос.
/// </summary>
[ContextClass("Соединение", "Connection")]
public class DBConnector : AutoContext<DBConnector>
{
private int _dbType;
private int _port;
private string _server;
private string _dbName;
private string _login;
private string _password;
private DbConnection _connection;
private string _connectionString;
private string _lastErrorMessage;
/// <summary>
/// Создает новый экземпляр класса Соединение
/// </summary>
public DBConnector()
{
_dbType = 0;
_port = 0;
_server = "";
_dbName = "";
_login = "";
_password = "";
_connectionString = "";
_lastErrorMessage = "";
_connection = null;
}
/// <inheritdoc/>
public override string ToString()
{
return "Соединение";
}
/// <summary>
/// Типы поддерживаемых СУБД
/// </summary>
/// <value>ТипСУБД</value>
[ContextProperty("ТипыСУБД", "DBTypes")]
public IValue DbTypes
{
get
{
var dtype = new EnumDBType();
return dtype;
}
}
/// <summary>
/// Тип подключенной СУБД
/// </summary>
/// <value>ТипСУБД</value>
[ContextProperty("ТипСУБД", "DBType")]
public int DbType
{
get
{
return _dbType;
}
set
{
_dbType = value;
}
}
/// <summary>
/// Порт подключения
/// </summary>
/// <value>Число</value>
[ContextProperty("Порт", "Port")]
public int Port
{
get
{
return _port;
}
set
{
_port = value;
}
}
/// <summary>
/// Имя или IP сервера
/// </summary>
/// <value>Строка</value>
[ContextProperty("Сервер", "Server")]
public string Server
{
get
{
return _server;
}
set
{
_server = value;
}
}
/// <summary>
/// Имя базы, в случае с SQLITE - путь к базе
/// </summary>
/// <value>Строка</value>
[ContextProperty("ИмяБазы", "DbName")]
public string DbName
{
get
{
return _dbName;
}
set
{
_dbName = value;
}
}
/// <summary>
/// Пользователь под которым происходит подключение.
/// Если СУБД MS SQL и пользователь не указан - используется Windows авторизация.
/// </summary>
/// <value>Строка</value>
[ContextProperty("ИмяПользователя", "Login")]
public string Login
{
get
{
return _login;
}
set
{
_login = value;
}
}
/// <summary>
/// Пароль пользователя
/// </summary>
/// <value>Строка</value>
[ContextProperty("Пароль", "Password")]
public string Password
{
get
{
return _password;
}
set
{
_password = value;
}
}
/// <summary>
/// Статус соединения с БД
/// </summary>
/// <value>Булево</value>
[ContextProperty("Открыто", "IsOpen")]
public bool IsOpen
{
get
{
if ((_connection == null))
{
return false;
}
switch (_connection.State)
{
case ConnectionState.Broken: return false;
case ConnectionState.Closed: return false;
case ConnectionState.Connecting: return false;
default: return true;
}
}
}
/// <summary>
/// Состояние соединения:
///
/// - Closed - Закрыто.
/// - Open - Открыто.
/// - Connecting - Соединяется с источником.
/// - Executing - Выполняет команду
/// - Fetching - Получает данные
/// - Broken - Соединение оборвано.
/// </summary>
[ContextProperty("Состояние", "State")]
public string State
{
get
{
if ((_connection == null))
{
return "Closed";
}
return _connection.State.ToString();
}
}
/// <summary>
/// Текст последней ошибки
/// </summary>
/// <value>Строка</value>
[ContextProperty("ПоследнееСообщениеОбОшибке", "LastErrorMessage")]
public string LastErrorMessage
{
get
{
return _lastErrorMessage;
}
}
/// <summary>
/// Соединение с БД
/// </summary>
public DbConnection Connection => _connection;
/// <summary>
/// Подготовленная строка соединения. В случае sqlite аналог ИмяБазы
/// </summary>
/// <value>Строка</value>
[ContextProperty("СтрокаСоединения", "ConnectionString")]
public string ConnectionString
{
get
{
return _connectionString;
}
set
{
_connectionString = value;
}
}
/// <summary>
/// Создать объект Соединение
/// </summary>
/// <returns>Соединение</returns>
[ScriptConstructor]
public static IRuntimeContextInstance Constructor()
{
return new DBConnector();
}
/// <summary>
/// Открыть соединение с БД
/// </summary>
/// <returns>Булево</returns>
[ContextMethod("Открыть", "Open")]
public bool Open()
{
if (DbType == (new EnumDBType()).Sqlite)
{
if (ConnectionString == string.Empty && DbName != string.Empty)
ConnectionString = string.Format("Data Source={0};", DbName);
_connection = new SQLiteConnection(ConnectionString);
return OpenConnection();
}
else if (DbType == (new EnumDBType()).MSSQLServer)
{
_connection = new SqlConnection();
if (ConnectionString != String.Empty)
{
_connection.ConnectionString = ConnectionString;
}
else
{
_connectionString = @"Data Source=" + Server;
if (Port != 0)
{
_connectionString += "," + Port.ToString();
}
_connectionString += "; Initial Catalog= " + DbName + ";";
if (Login != String.Empty)
{
_connectionString += "User ID = " + Login +";";
if (Password != String.Empty)
{
_connectionString += "Password = " + Password + ";";
}
}
else
{
_connectionString += "Integrated Security=True";
}
_connection.ConnectionString = _connectionString;
}
return OpenConnection();
}
else if (DbType == (new EnumDBType()).MySQL)
{
if (ConnectionString == String.Empty)
{
_connectionString = "";
_connectionString += "server=" + _server + ";";
_connectionString += "user=" + _login + ";";
_connectionString += (_password != String.Empty ? "password=" + _password + ";" : "");
_connectionString += (_dbName != String.Empty ? "database=" + _dbName + ";" : "");
_connectionString += (_port != 0 ? "port=" + _port.ToString() + ";" : "");
}
_connection = new MySqlConnection(_connectionString);
return OpenConnection();
}
else if (DbType == (new EnumDBType()).PostgreSQL)
{
if (ConnectionString == String.Empty)
{
_connectionString = "";
_connectionString += "Host=" + _server + ";";
_connectionString += "Username=" + _login + ";";
_connectionString += (_password != String.Empty ? "Password=" + _password + ";" : "");
_connectionString += (_dbName != String.Empty ? "Database=" + _dbName + ";" : "");
_connectionString += (_port != 0 ? "port=" + _port.ToString() + ";" : "");
}
_connection = new NpgsqlConnection(_connectionString);
return OpenConnection();
}
return false;
}
private bool OpenConnection()
{
try
{
_connection.Open();
_lastErrorMessage = "";
return true;
}
catch (Exception e)
{
_lastErrorMessage = e.Message;
return false;
}
}
/// <summary>
/// Закрыть соединение с БД
/// </summary>
[ContextMethod("Закрыть", "Close")]
public void Close()
{
_connection.Close();
_connection.ConnectionString = "";
_connection.Dispose();
_connection = null;
}
/// <summary>
/// Создать запрос с установленным соединением
/// </summary>
/// <returns>Запрос - Запрос с установленным соединением</returns>
[ContextMethod("СоздатьЗапрос", "CreateQuery")]
public Query CreateQuery()
{
var query = new Query();
query.SetConnection(this);
return query;
}
}
}