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database_to_tcl_string_or_null — Returns one (possibly non-existant) value from an SQL query
package require nstcl-database ?1.0?
package require nstcl ?1.0?
::nstcl::database_to_tcl_string_or_null dbhandle SQL ?default ?
Returns the first column of the result of an SQL query. An error is thrown if the database returns more than one row. If no rows are returned, and default is specified then the value of default is returned (otherwise the empty string is returned).
database, nstcl