template::util::is_unique (public)

 template::util::is_unique table columns values

Defined in packages/acs-templating/tcl/util-procs.tcl

Queries a database table for the existence of a particular row. Useful for validating form input to reduce the possibility of unique constraint violations.

Parameters:

table - The name of a database table.
columns - A list of columns on which to select the row.
values - A list of values for each specified column.

Returns:

1 if the row exists, 0 if not

Partial Call Graph (max 5 caller/called nodes):

Testcases:

No testcase defined.

Source code:

    set query "select count(*) from $table where "

    for { set i 0 } { $i < [llength $columns] } { incr i } {

        set value [ns_dbquotevalue [lindex $values $i]]
        lappend conditions "[lindex $columns $i] = $value"
    }

    append query [join $conditions " and "]

    set count [db_string get_count $query]

    return [expr {$count == 0}]

XQL Not present:

Generic, PostgreSQL, Oracle