getColumn()

Factory method to create a query function to return an array of values from a single column.

Method signature

getColumn({ name?: string, columns: QueryColumns, columnName: string, query: GenericQueryFunction})

• name - optional name for logging
• columns - columns returned from the query. See column concepts
• columnName - the column to return values from
• query - function which returns the query to be executed. See querying

Return value

An async query function. Invoking this function with the arguments required by query will execute the query and return the results from the column specified by columnName

Query results

• [] if no rows were returned from the query
• Array of columnName values