How do I declare a host variable in DB2?

How do I declare a host variable in DB2?

You can define a host variable in your program to hold each column. The host variable consists of the local variable name, preceded by a colon. You then can name the data areas with an INTO clause, as shown: EXEC SQL SELECT EMPNO, LASTNAME, DEPT INTO :CBLEMPNO, :CBLNAME, :CBLDEPT FROM EMP WHERE EMPNO = :EMPID END-EXEC.

What is host variable in COBOL DB2?

Host variables are COBOL language variables that are referenced within SQL statements. Host variables allow an application to exchange data with the database manager. After the application is precompiled, host variables are used by the compiler as any other COBOL variable.

Where do you declare host variable in COBOL program?

They are used to pass values to and receive values from a database. Host variables can be defined in the File Section, Working-Storage Section, Local-Storage Section or Linkage Section of your COBOL program and can be coded using any level number between 1 and 48.

How do you declare a variable in COBOL?

A COBOL variable declaration follows this syntax. The level number can be for example 01. The name can be anything using characters [A-Z] and numbers [0-9], including (-) to separate words. Followed by the clause “PICTURE IS” to indicate that the programmer wants to provide a data / type PICture.

What is a host variable?

A host variable is a field in your program that is specified in an SQL statement, usually as the source or target for the value of a column. The host variable and column must have compatible data types.

What is difference between copy and include in COBOL?

A COPY statement can appear in the source text anywhere a character string or a separator can appear. The INCLUDE statement inserts declarations or statements into a source program. The INCLUDE statement inserts declarations or statements into a source program.

What is host variable?

How do you declare a Dclgen in COBOL?

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 Comp 3 variables COBOL?

COBOL Comp-3 is a binary field type that puts (“packs”) two digits into each byte, using a notation called Binary Coded Decimal, or BCD. This halves the storage requirements compared to a character, or COBOL “display”, field.

What is 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.

When to use a COBOL host variable in DB2?

When you do assignments or comparisons of data that have compatible data types, Db2 converts those compatible data types. Table 2. COBOL host variable equivalents that you can use when retrieving data of a particular SQL data type p is precision; s is scale. 0≤ s ≤ p ≤31. If s =0, use S9 ( p )V or S9 ( p ).

When do you declare Host variables in SQL?

You must explicitly declare all host variables and host-variable arrays that are used in SQL statements in the WORKING-STORAGE SECTION or LINKAGE SECTION of your program’s DATA DIVISION. You must explicitly declare each host variable and host-variable array before using them in an SQL statement.

What’s the difference between embedded SQL and COBOL?

Embedded SQL. COBOL is known as the Host Language. COBOL-DB2 applications are those applications that include both COBOL and DB2. Embedded SQL statements work like normal SQL statements with some minor changes. For example, the output of a query is directed to a predefined set of variables which are referred as Host Variables.

How to make Host variables unique in DB2?

If you are using the Db2 precompiler, ensure that the names of host variables and host-variable arrays are unique within the program, even if the variables and variable arrays are in different blocks, classes, procedures, functions, or subroutines. You can qualify the names with a structure name to make them unique.