Oracle Magazine, September/October 2018
Database Developer OPEN SOURCE ORACLE MAGAZINE SEPTEMBER OCTOBER 2018 72 if context id binds employee_ id context id query nwhere employee_ id employee_ id const result await database simpleExecute query binds return result rows module exports find find The employees database module brings in the generic database module and then initializes a constant named baseQuery to a SQL query on the employees table Double quoted column aliases are used in the query to control the case of the keys returned Next a function named find is declared and used to execute the query and return the rows fetched If the context parameter passed in has a truthy value for id then a WHERE clause is appended to the query so that only a single employee is returned Note that the value of context id was not appended to the query directly Instead a placeholder named employee_ id was used this is known as a bind variable Using bind variables with Oracle Database is very important for security and performance reasons The value of the bind variable is assigned to the binds object which
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