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Xbasic syntax to modify <<%a% ... %a%

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  • Xbasic syntax to modify <<%a% ... %a%

    dim _var as c = " column = "something""

    sql = <<%a%
    SELECT column
    FROM table
    WHERE [ + _var + ]
    %a%

    I know [ + _var + ] does not work. What is the correct syntax?

    I want to produce a query like this:

    SELECT column
    FROM table
    WHERE column = "something"

  • #2
    Use arguments:

    dim tcolumn as c = "something"
    args.set("vcolumn",tcolumn)
    sql = <<%a%
    SELECT column
    FROM table
    WHERE column=:vcolumn
    %a%
    Gary S. Traub, Ph.D.

    Comment


    • #3
      I want to use text that contains more than just arguments. I want to substitute a complex WHERE statement.

      Comment


      • #4
        Can you give an example of "something"?
        Gary S. Traub, Ph.D.

        Comment


        • #5
          Without more info, I am thinking of 2 possible ways to go: (1) could use if statement in where clause, or (2) could use if in the xbasic so that if one condition is true, run this query, or if that condition is true, run this other query
          Gary S. Traub, Ph.D.

          Comment


          • #6
            Using args is preferred but here are some other alternatives absent a better example (done in the interactive window) ...

            Using stritran()
            Code:
            dim myVar as c = "column = 'hello'"
            
            dim sql as c = ""
            
            sql = "SELECT * FROM MYTABLE WHERE __STRING__"
            
            sql = stritran(sql,"__STRING__",myVar)
            
            ?sql
            = "SELECT * FROM MYTABLE WHERE column = 'hello'"
            Add var to the end
            Code:
            dim myVar as c = "column = 'hello'"
            
            dim sql as c = ""
            
            sql = "SELECT * FROM MYTABLE WHERE " + myVar
            
            ?sql
            = "SELECT * FROM MYTABLE WHERE column = 'hello'"
            Add var in the middle
            Code:
            dim myVar as c = "'hello'"
            
            dim sql as c = ""
            
            sql = "SELECT * FROM MYTABLE WHERE someColoumn = " + myVar + " AND someOtherColoumn = 1"
            
            ?sql
            = "SELECT * FROM MYTABLE WHERE someColoumn = 'hello' AND someOtherColoumn = 1"
            Quoted session var
            Code:
            dim sql as c = ""
            
            session.myVar = "mike"
            
            sql = "SELECT * FROM MYTABLE WHERE column = '" + session.myVar + "'"
            
            ?sql
            = "SELECT * FROM MYTABLE WHERE column = 'mike'"
            Mike Brown - Contact Me
            Programmatic Technologies, LLC
            Programmatic-Technologies.com
            Independent Developer & Consultant

            Comment


            • #7
              I specifically want to modify the text within the delimiters.

              Here is a contrived example - it demonstrates exactly what i want to do. I just don't know the correct syntax.:

              dim _var as c

              if x = "true" then
              _var = "use this text when true"
              else
              _var = "use this text if not true"
              end if

              sql = <<%a%
              SELECT column
              FROM table
              WHERE [ + _var + ]
              %a%

              Comment


              • #8
                Originally posted by Pizzadude View Post
                I specifically want to modify the text within the delimiters.

                Here is a contrived example - it demonstrates exactly what i want to do. I just don't know the correct syntax.:

                dim _var as c

                if x = "true" then
                _var = "use this text when true"
                else
                _var = "use this text if not true"
                end if

                sql = <<%a%
                SELECT column
                FROM table
                WHERE [ + _var + ]
                %a%
                Do not make this too complicated. Your sql is just a string. So

                sql = <<%a%
                SELECT column
                FROM table
                WHERE
                %a%

                sql = sql + var

                So your original var is "use this text when true" but use this syntax " use this text when true".

                By the way there is absolutely no need to use arguments in sql if there is no user input. But if there is use then arguments.

                Comment


                • #9
                  I know there are several methods to do this outside of the delimiters.
                  I specifically want to modify the text within the delimiters.

                  Comment


                  • #10
                    The suggestion given above seems to be what you need. For example,

                    sql1 = <<%a%
                    SELECT column
                    FROM table
                    %a%

                    sql 2 = "WHERE" + "whatever you want here"

                    SQL = sql1 + sql2

                    Isn't this what you want?
                    Gary S. Traub, Ph.D.

                    Comment


                    • #11
                      My favorite way to do it is

                      dim myWhere as c

                      if x = "true" then
                      myWhere = " WHERE color = 'blue'"
                      else
                      myWhere = " WHERE color = 'red'"
                      end if

                      sql = <<%a%
                      SELECT column
                      FROM table
                      {myWHERE}
                      %a%

                      note those are curly brackets.

                      sql = evaluate_string(myWHERE)

                      Pat Bremkamp
                      MindKicks Consulting

                      Comment


                      • #12
                        Code:
                        dim _var as c = " column = "something""
                        
                        sql = <<%a%
                        SELECT column
                        FROM table
                        WHERE <dynWhere>
                        %a%
                        
                        strtran(sql,"<dynWhere>","id = :id + " + _var + "+ somethingelse = :somethingelse" )
                        I typically do something like this, and then use strtran(sql,"<dynWhere>","id = :id + " + _var + "+ somethingelse = :somethingelse" ) to replace <dynWhere> with the code I really want.
                        Gregg Schmidt

                        Comment


                        • #13
                          evaluate_string() is a good method for me in this case. It allows for changing the value of a variable in only one place in a function, and then replacing the placeholder in multiple sql statements.

                          Thanks, Pat!

                          Comment


                          • #14
                            OOPS, I'm sure you figured out that I should have used sql = evaluate_string(sql)
                            Pat Bremkamp
                            MindKicks Consulting

                            Comment


                            • #15
                              HA! I didn’t even notice.

                              Comment

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