GetSQLValueFromSource

Declaration

function GetSQLValueFromSource(const aSQL: string; aDBIndex : integer): variant;

Example

procedure OnMapEvent(var Value:Variant);
begin
  Value := GetSQLValueFromSource('select name from dr_accs where accno=1',0);
end;

Description

Returns a single value being the first field in aSQL query. It is more common to use GetDataSetFromSource to return multiple values - this saves re-querying the database to retrieve multiple fields from a single record.

The SQL query is executed against a DB Connection on the Source of the map. aDBIndex indicates which of the DB Connections is used based on its zero based index.