Dinamic Select

Question

Hi all,
I am trying to do a dynamic select in which I don´t know which are going to be the conditions of the clause WHERE.
This is my code;
DATA: BEGIN OF it_selopt OCCURS 0,
        field      TYPE string,
        value      TYPE string,
      END OF it_selopt,
      wa_selopt LIKE LINE OF it_selopt.
DATA cond_syntax TYPE string.
it_selopt-field = 'MATNR'.
it_selopt-value = 'Hello'.
APPEND it_selopt.
LOOP AT it_selopt.
  wa_selopt = it_selopt.
* First condition
  AT FIRST.
       CONCATENATE wa_selopt-field '=' wa_selopt-value
         INTO cond_syntax SEPARATED BY space.
    CONTINUE.  "
  ENDAT.
* Other conditions 
       CONCATENATE cond_syntax 'AND' wa_selopt-field '=' wa_selopt-value
            INTO cond_syntax SEPARATED BY space.
ENDLOOP.
TRY.
    SELECT SINGLE *
           FROM eban
           WHERE (cond_syntax).
  CATCH cx_sy_dynamic_osql_error.
    MESSAGE `Wrong WHERE condition!` TYPE 'I'.
ENDTRY.
The problem is that in runtime gives a syntax error for the following thing:
In runtime the variable cond_syntax has the following:  MATNR = Hello
And it should have this: MATNR = 'Hello'
within quotation marks.
Because if it does not take Hello as if it was a variable.
Also I have tried the following thing:
DATA: field_2_read TYPE string.
  DATA: d_tabix TYPE n.
  LOOP AT it_selopt.
       wa_selopt = it_selopt.
       d_tabix = sy-tabix.
       CONCATENATE 'IT_SELOPT[' d_tabix ']-low' INTO field_2_read.
* First condition
       AT FIRST.
          CONCATENATE wa_selopt-field '=' field_2_read 
            INTO cond_syntax SEPARATED BY space.
          CONTINUE.
       ENDAT.
* Other conditions 
       CONCATENATE cond_syntax 'AND' wa_selopt-field '=' field_2_read
            INTO cond_syntax SEPARATED BY space.
  ENDLOOP.
But it continues giving me a error.
Any idea how?
Thanks in advance

Answer 1

it_selopt-value = '''Hello'''.
Thomas