A static CALL statement without a corresponding CREATE PROCEDURE
statement is processed with the following rules.
- All host variable arguments are treated as INOUT type parameters.
- The CALL type is GENERAL (no indicator argument is passed).
- The program to call is determined based on the procedure name specified
on the CALL, and, if necessary, the naming convention.
- The language of the program to call is determined based on information
retrieved from the system about the program.
Example: Embedded CALL statement where no procedure definition
exists
The following is a PL/I example of an embedded CALL statement
where no procedure definition exists:
DCL HV2 CHAR(10);
:
EXEC SQL CALL P2 (:HV2);
:
When the CALL statement is issued, DB2® SQL for iSeries™ attempts
to find the program based on standard SQL naming conventions. For the above
example, assume that the naming option of *SYS (system naming) is used and
that a DFTRDBCOL parameter was not specified on the CRTSQLPLI command. In
this case, the library list is searched for a program named P2. Since the
call type is GENERAL, no additional argument is passed to the program for
indicator variables.
Note: If an indicator variable is specified on the CALL statement
and its value is less than zero when the CALL statement is executed, an error
results because there is no way to pass the indicator to the procedure.
Assuming program P2 is found in the library list, the contents
of host variable HV2 are passed in to the program on the CALL and the argument
returned from P2 is mapped back to the host variable after P2 has completed
execution.
For numeric constants passed on a CALL statement, the following
rules apply:
- All integer constants are passed as fullword binary integers.
- All decimal constants are passed as packed decimal values. Precision and
scale are determined based on the constant value. For instance, a value of
123.45 is passed as a packed decimal(5,2). Likewise, a value of 001.01 is
also passed with a precision of 5 and a scale of 2.
- All floating point constants are passed as double-precision floating point.
Special registers specified on a dynamic CALL statement are passed
as follows:
- CURRENT DATE
- Passed as a 10-byte character string in ISO format.
- CURRENT DEGREE
- Passed as a 5-byte character string.
- CURRENT TIME
- Passed as an 8-byte character string in ISO format.
- CURRENT TIMEZONE
- Passed as a packed decimal number with a precision of 6 and a scale of
0.
- CURRENT TIMESTAMP
- Passed as a 26-byte character string in IBM SQL format.
- CURRENT SCHEMA
- Passed as an 128-byte varying length character string.
- CURRENT SERVER
- Passed as an 18-byte varying length character string.
- USER
- Passed as an 18-byte varying length character string.
- CURRENT PATH
- Passed as a 3483-byte varying length character string.
- SESSION_USER
- Passed as a 128-byte varying length character string.
- SYSTEM_USER
- Passed as a 128-byte varying length character string.