Is Dclgen Mandatory In Cobol?

Including the DCLGEN member is not mandatory until we explicitly give the host variables declaration in the working storage section.

Is it mandatory to use Dclgen?

It is not mandatory to use DCLGEN. Using DCLGEN, helps detect wrongly spelt column names etc. during the pre-compile stage itself ( because of the DECLARE TABLE ). DCLGEN being a tool, would generate accurate host variable definitions for the table reducing chances of error.

What is the use of Dclgen in Db2?

DCLGEN generates a table or view declaration and puts it into a member of a partitioned data set that you can include in your program. When you use DCLGEN to generate a table declaration, Db2 gets the relevant information from the Db2 catalog.

Is Sqlca mandatory in COBOL?

In COBOL, INCLUDE SQLCA must be specified in the Working-Storage Section or the Linkage Section. INCLUDE SQLCA must not be specified if the program is prepared (either with the Db2 precompiler or coprocessor) with the STDSQL(YES) SQL processing option. For a description of the SQLCA, see SQL communication area (SQLCA).

How do I use Dclgen in COBOL program?

To include declarations from DCLGEN in your program: Code the following SQL INCLUDE statement in your program: EXEC SQL INCLUDE member-name END-EXEC. member-name is the name of the data set member where the DCLGEN output is stored.

What is Dclgen in COBOL?

DCLGEN (Declaration Generator) is a structure‑generating utility that maps the columns of a database table into a structure (a COBOL record) that can be included in an embedded SQL declaration section.

How do I get Dclgen in DB2?

Procedure

1. To start DCLGEN from ISPF through DB2I: Select the DCLGEN option on the DB2I Primary Option Menu panel.
2. To start DCLGEN directly from TSO: Sign on to TSO, issue the TSO command DSN, and then issue the subcommand DCLGEN.

Can we use Dclgen with copy statement?

If the DCLGEN members are given with COPY statement instead of INCLUDE statement, then it will result in DB2 warnings during pre-compilation as the pre-compiler would not be able to validate the SQL statements in COBOL-DB2 program.

Is close cursor mandatory in Db2?

If you processed the rows of a result table and you do not want to use the cursor again, you can let the system close the cursor. The system automatically closes the cursor when: A COMMIT without HOLD statement is issued and the cursor is not declared using the WITH HOLD clause.

What does Dclgen stand for?

The DCLGEN (Declaration Generator) utility is a structure-generating utility that maps the columns of a database table into a structure that you can include in a declaration section.

What is Sqlca and Sqlda?

The SQLCA and SQLDA are described in the appropriate DB2^® documentation from IBM^®. The application can use INCLUDE SQLCA and INCLUDE SQLDA statements to define these areas to the application, or the areas can be coded into the application. If INCLUDE statements are used, an SQL precompile is required.

Where is Sqlca stored?

The SQLCA is automatically provided in REXX. To display the SQLCA after each command executed through the command line processor, issue the command db2 -a . The SQLCA is then provided as part of the output for subsequent commands. The SQLCA is also dumped in the db2diag log file.

At which section we have to define Sqlca?

WORKING-STORAGE SECTION
The SQLCODE, SQLSTATE, and SQLCA variable declarations must appear in the WORKING-STORAGE SECTION or LINKAGE SECTION of your program and can be placed wherever a record description entry can be specified in those sections.

Is close cursor mandatory in COBOL?

In case you try to open a cursor without closing that cursor you will get an error as ‘ trying to open a cursor which is already open’. SQLCODE = -502.

What is Dclgen copybook?

DCLGEN is the tool which is used to generate the COBOL copybook for the specific table. The columns names of the table will be remain same but the underscores are replaced by Hyphens. That copybook can be used in the program by using INCLUDE command like below. EXEC SQL INCLUDE table-copybook END-EXEC.

What is null indicator in COBOL-DB2?

The null indicator is used by DB2 to track whether its associated column is null or not. A positive value or a value of 0 means the column is not null and any actual value stored in the column is valid.

What does the Dclgen member contains?

What does DCLGEN contains? information about the table’s definition and the definition of each column within the table. DCLGEN generates a table declaration and puts it into a member of a partitioned data set that you can include in your program.

What is PIC S9 in COBOL?

PIC X for strings. PIC X(100) means a 100-byte string. PIC 9 for numbers, optionally with S (sign) or V (implicit decimal point). For example, PIC S9(7)V99 means a signed number with 7 digits to the left of the implicit decimal point and 2 digits to the right.

Which is better plan or package in Db2?

An application plan contains a list of package names. Db2 applications require an application plan. Packages make application programs more flexible and easier to maintain. In general, you create plans and packages by using the Db2 commands BIND PLAN and BIND PACKAGE.

How do I view Dclgen in mainframe?

Invoke DCLGEN by performing one of the following actions:

1. To start DCLGEN from ISPF through DB2I: Select the DCLGEN option on the DB2I Primary Option Menu panel.
2. To start DCLGEN directly from TSO: Sign on to TSO, issue the TSO command DSN, and then issue the subcommand DCLGEN.

Why cursor is used in COBOL?

The CURSOR is used when we have to fetch multiple rows from a table. There are 4 steps involved in order to use a cursor in a COBOL-DB2 program. FETCH cursor− In this statement, we start fetching the data from DB2 and the row data is stored in host variables. The syntax is like below.