Introduction to CA IDMS Data Manipulation Language › Compiling and Executing Programs › Compiling Programs › Step 1—DML Precompiler

Step 1—DML Precompiler

The DML Precompiler Converts DML Statements

The DML precompiler converts DML statements in the source program to PL/I CALL statements and copies information maintained in the dictionary into the application program. For Example, the DML precompiler could copy database record descriptions, map records, map definitions, and other predefined modules (such as communications blocks) into the program.

Output from the DML precompiler is a source file, which serves as input to the PL/I compiler, and an optional source listing. The output file differs from the source input to the DML precompiler in the following ways:

• Source code (such as the IDMS DB communications block and the IDMS_STATUS routine) has been added to the program.
• DML statements have been replaced by PL/I CALL statements and changed to comment entries.

Additionally, the DML precompiler produces a listing of the following errors:

• Incorrect DML entries
• Statements inconsistent with the program's declared subschema view
• Any other error conditions detected during DMLP processing
• Warning messages indicating source code conditions that could adversely affect run units using the program