Sqlite Value matching

[Deye]

Hi,

In this function using WHERE [" & $sColumFind & "] = " & _SQLite_Escape($sValueFind)

a. I want to come up with something where I can have $sColumFind ="Colum5_Colum4_Column3_Colum2_Colum1_Colum0"
and in $sValueFind have "match_for_5,match_for_4 ....")
and accordingly get the right row to do a replacement on Colum6 ..

1. What would be the basic syntax of the command

To be more accurate and precised to what i'll need, how can I just send in a $sValueFind array to check if all values exist in a specific row

Or if I have to use the syntax mentioned in (a.) I'd just pass the string and get a match for match_for_5 on Colum5
And function will auto walk through Columns using $sValueFind = match_for_# . backto . Match_for_0 

excuse me for having little knowledge for command combinations and expansions that can be used with aqlite

for now, would just like to see how this can fall in to place

Thanks

Func _SQLite_update($hDB, $sTable, $sColumFind, $sValueFind, $sColumChange, $sValueChange)

    $SQLFINDSTRING = "UPDATE [" & $sTable & "] SET [" & $sColumChange & "] = " & _SQLite_Escape($sValueChange) & " WHERE [" & $sColumFind & "] = " & _SQLite_Escape($sValueFind) & ";"

    ConsoleWrite($SQLFINDSTRING)
    _SQLite_Exec($hDB, $SQLFINDSTRING)

EndFunc   ;==>_SQLite_update

 

[jchd]

SQL doesn't offer such function or feature. You'll have to build the WHERE clause string explicitely, like this:

update mytable set
  this_column = that_value,
  other_column = other_value
where
  explicit_column_X = explicit_value_X
  AND
  explicit_column_Y = explicit_value_Y
  AND
  explicit_column_Z = explicit_value_Z;

Realize that column (just as all other DDL names, like table names) can't be parametrized in SQL. SQLite is no exception in the SQL world.

OTOH having such generic need may denote an inapropriate database design, depending on your specific context.

[Deye]

Thanks

$sqlString = "SELECT * FROM aManager WHERE '" & $match_for_5 & "' LIKE Colum5 || '%'; "

what im currently using is
1. _SQLite_GetTable2d(-1, $sqlString,...)
2. searching $aResults array if a value needs to be updated ..

Q. is it possible to pipe SELECT with UPDATE

BTW, is this syntax right for adding more criterion s for matching? (Edit: works just tested ..)

$sqlString = "SELECT * FROM aManager WHERE '" & $match_for_5 & "' LIKE Colum5 And '" & $match_for_4 & "' LIKE Colum4 || '%'; "

I have all the values that need to match from Colum5 to Colum0
Through out all Colum5 = its value is supposed to be unique, but just in case its not, I want to also test\match Colum4_value to Colum0_value for a given row 

Edited September 2, 2017 by Deye

[jchd]

You say you use gettable2d then search the resulting array. But then why don't you refine your select query in the SQL statement rather than with pedestrian code in the array then again in the update statement?

Select and update are separate statements. If the update operates on parts or all of the result of the select, then you should group both statements inside a transaction to keep away from updating possibly inconsistent data (another process could change the database in between select & update. OTOH it's very useful and much more efficient to place the select where clause in the update statement itself.

If col_5 is meant to be unique (or any combination of columns) then make this/these columns unique (see unique constraint) or primary key. Note that it's pretty hard to advise about DB design without any clue about the semantics of the entities you're managing and the needs of the application(s).