使用列的IF更新SQLite（Android）中的表

Question

. Hello, My table's columns are: [ID, VALUE, MODIFIED]

How can I make the following update in sql (Its probably easy but i don't achieve it ). i have a int= new_value

UPDATE FROM table SET value = new_value,modified= if (new_value==VALUE) then 0 else 1;

Answer 1

Query the original data and use an if-else statement.

if(originalValue == newValue) {
    // Update query
}
else {
    // Update query
}

Answer 2

Why not evaluating if it is modified outside the sql:

int isModified = newvalue != VALUE ? 1 : 0;

And in SQL:

UPDATE FROM table SET value = new_value, modified = isModified

Answer 3

In regular SQL you can do it like this:

UPDATE tablename 
    SET value = new_value, 
    modified = 
        CASE
            WHEN new_value = value THEN 0
            ELSE 1
        END

But I'm not sure if SQLite supports CASE