[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] | Reference for unit 'SQLDB' (#fcl)

# TSQLQuery.DataSource

Source for parameter values for unbound parameters

## Declaration

Source position: sqldb.pp line 712

`published property TSQLQuery.DataSource : TDataSource;`

## Description

Datasource can be set to a dataset which will be used to retrieve values for the parameters if they were not explicitly specified.

When Open or ExecSQL is called, and the Datasource property is not Nil then for each parameter for which no value was explicitly set (its Bound property is False), the value will be retrieved from the dataset connected to the datasource.

For each parameter, a field with the same name will be searched, and its value and type will be copied to the (unbound) parameter. The parameter remains unbound.

## See also

Params |  | Parameters detected in the SQL statement.
ExecSQL |  | Execute a SQL statement that does not return a result set
UsingParams |  | Using parameters
TParam.Bound |  | Is the parameter value bound (set to fixed value)