SQL to text Learn programming Visual Basic (VB.net)

Lesson:

File Management

Exercise:

SQL to text 52


Objetive:

You must create a Visual Basic (VB.net) program capable of parsing SQL language INSERT commands and extracting their data to separate lines of text, as follows: if the input file contained these three lines:

insert into people (name, address, age) values ("smith, pedro", "your street", 23);

insert into people (name, address, age) values ("juan", "calle cinco, 6", 24);

insert into cities (code, name) values ("a" "alicante");

The resulting file should have on each line the name of a field, followed by a "colon" and its value. In addition, each record must be preceded by the name of the table and followed by a blank line, like this:

persons name: smith, pedro address: your street age: 23

persons name: juan Address: 5th Street, 6 age: 24

cities code: a name: alicante


Code:

Imports System
Imports System.IO
Namespace SQL2text
    Class Program
        Private Shared Sub Main(ByVal args As String())
            Dim ficheroEntrada As StreamReader = Nothing
            Dim linea As String
            Dim nombre As String
            Console.WriteLine("Not enough parameters!")
            Console.Write("Enter file name: ")
            nombre = Console.ReadLine()

            Try
                ficheroEntrada = File.OpenText(nombre)
            Catch e As Exception
                Console.WriteLine(e.Message)
            End Try

            Try

                Do
                    linea = ficheroEntrada.ReadLine()

                    If linea IsNot Nothing Then
                        Console.WriteLine()
                        Dim tableName As String = linea.Substring(12).Split(" "c)(0)
                        Dim campo As String() = linea.Substring(linea.IndexOf("(") + 1, linea.IndexOf(")") - linea.IndexOf("(") - 1).Split(","c)
                        Dim valores As String() = linea.Substring(linea.IndexOf("values (") + 9, linea.IndexOf(");") - linea.IndexOf("values (") - 9).Split(","c)
                        Console.WriteLine(tableName)

                        For i As Integer = 0 To campo.Length - 1
                            Console.Write(campo(i).Trim() & ": ")
                            Console.WriteLine(valores(i).Trim().Replace("'", ""))
                        Next
                    End If
                Loop While linea IsNot Nothing

            Catch e As Exception
                Console.WriteLine(e.Message)
            End Try

            Console.ReadLine()
        End Sub
    End Class
End Namespace