Open a database file

These topics describe how to use the Open Query File (OPNQRYF) and Open Database File (OPNDBF) commands to open database file members in a program. Examples, performance considerations, and guidelines for writing a high-level language program are included. Typical errors that might occur are also discussed.

• Open a database file member
  You can open a database file member with statements in your high-level language program. You can also use the control language (CL) open commands: Open Database File (OPNDBF) and Open Query File (OPNQRYF).
• Use Open Database File (OPNDBF) command
  Usually, when you use the Open Database File (OPNDBF) command, you use the defaults for the command parameter values. Sometimes you might want to specify particular values, instead of using the default values. Listed here are the parameters you can specify.
• Use Open Query File (OPNQRYF) command
  The Open Query File (OPNQRYF) command is a control language (CL) command that allows you to perform many data processing functions on database files. These topics discuss how to create a query using the OPNQRYF command, how to specify parameters for its major functions, and how to use it with your high-level language program.