Data Translation Rules

6.6.2 Data Translation Rules

The TMA TCP Gateway adheres to the following data translation rules:

CARRAY fields are passed untranslated as sequences of bytes.
STRING and CHAR fields undergo ASCII to EBCDIC translation (if needed).
SHORT and LONG fields are translated to S9(4) COMP and S9(9) COMP, respectively.
FLOAT and DOUBLE fields are translated to COMP‑1 and COMP‑2, respectively.

Note:
The Oracle Tuxedo product provides a field type named dec_t that supports decimal values within VIEWs. The TMA TCP for IMS gateway translates these fields into machine independent representations of packed decimals. For example, dec_t(m,n) becomes S9(2*m-(n+1))V9(n) COMP-3. Therefore, a decimal field with a size of 8,5 corresponds to S9(10)V9(5) COMP-3

The following table summarizes the rules for translating between C and IBM 370 data types.

Remote Data Type	Description	View Field Type/Length
`PIC X(n)`	Alphanumeric characters	`string / n`
`PIC X`	Single alphanumeric character	`char`
`PIC X(n)`	Raw bytes	`carray / n`
`PIC 9`	Single numeric byte	`carray / 1`
`PIC S9(4) COMP`	32-bit integer	`short`
`PIC S9(4) COMP`	64-bit integer	`long`
`COMP-1`	Single-precision floating point	`float`
`COMP-2`	Double-precision floating point	`double`
`PIC` `S9((m+(n+1))/2)V9(n)` `COMP-3`	Packed decimal	`dec_t / m,n`

Parent topic: How Oracle TMA TCP Gateway Translates Data