確保在調用每個回購函數後總是關閉SQL數據庫連接

我想知道是否需要在每個存儲庫函數中使用using語句以確保在每批數據庫調用之後關閉連接。確保在調用每個回購函數後總是關閉SQL數據庫連接

例如：我想在某些存儲庫函數內多次調用connection.query或connection.execute。如果我不使用using語句，我的連接何時關閉？目標是儘可能提高Web開發的效率。

BaseRepository

public static string ConnectionString => @"Server=.;Database=applicationDb;User ID=sa;Password=Password12!"; 
protected SqlConnection _connection; 
protected SqlConnection connection => _connection ?? (_connection = GetOpenConnection()); 

public static SqlConnection GetOpenConnection(bool mars = false) 
{ 
    var cs = ConnectionString; 
    if (mars) 
    { 
     var scsb = new SqlConnectionStringBuilder(cs) 
     { 
      MultipleActiveResultSets = true 
     }; 
     cs = scsb.ConnectionString; 
    } 
    var connection = new SqlConnection(cs); 
    connection.Open(); 
    return connection; 
} 

public SqlConnection GetClosedConnection() 
{ 
    var conn = new SqlConnection(ConnectionString); 
    if (conn.State != ConnectionState.Closed) throw new InvalidOperationException("should be closed!"); 
    return conn; 
} 

public void Dispose() 
{ 
    _connection?.Dispose(); 
}

CustomerRepository：BaseRepository

隨着BaseRepository設置事情是這樣的。有以下任何區別：

public IEnumerable<Customer> GetCustomers() 
{ 
    using (connection) 
    { 
     StringBuilder sql = new StringBuilder(); 
     sql.AppendLine("SELECT Id, Name, Email "); 
     sql.AppendLine("FROM Customer;"); 

     StringBuilder deleteSql = new StringBuilder(); 
     deleteSql = new StringBuilder(); 
     deleteSql.AppendLine("DELETE FROM Xyz "); 
     deleteSql.AppendLine("FROM CustomerId = @CustomerId;"); 
     connection.Execute(deleteSql.ToString(), new { CustomerId = 5 }); 

     return connection.Query<Customer>(sql.ToString()).ToList(); 
    } 
}

或不使用：

public IEnumerable<Customer> GetCustomers() 
{ 
     StringBuilder sql = new StringBuilder(); 
     sql.AppendLine("SELECT Id, Name, Email "); 
     sql.AppendLine("FROM Customer;"); 

     StringBuilder deleteSql = new StringBuilder(); 
     deleteSql = new StringBuilder(); 
     deleteSql.AppendLine("DELETE FROM Xyz "); 
     deleteSql.AppendLine("FROM CustomerId = @CustomerId;"); 
     connection.Execute(deleteSql.ToString(), new { CustomerId = 5 }); 

     return connection.Query<Customer>(sql.ToString()).ToList(); 
}

來源

2017-07-02 Blake Rivell