The DBCACNX consists of two logical sections:
One header always exists and is followed by one or more elements. If data is associated with an element, it may either be included with the element or pointed to by the element. More than one extension may be chained together.
Figure 10 lists the sequential order of the header fields. Figure 11 lists the sequential order of the element fields.
Figure 10: DBCACNX Header Fields
When the Level field contains a value of '2', there is an additional header field as shown below:
New development should use only the level 2 form. The level 1 form is deprecated.
Figure 11: DBCACNX Element Fields When Level = 2
The sections that follow describe each of the fields in alphabetical order.
Data‑length
Data‑length is a four-byte unsigned integer field into which the length of the data is placed. If no data is associated with this type, the field is zero.
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The variable name for Data‑length is... |
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In this language... |
Level 2 |
Level 1 |
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COBOL |
D8XCEDLN |
DBXCEDLN |
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PL/I |
D8XCEDLN |
DBXCEDLN |
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C |
d8xcedLn |
dbxcedLn |
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IBM Assembler |
D8XCEDLN |
DBXCEDLN |
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This routine... |
Does this for Data‑length. . .1 |
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DBCHINI |
– |
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DBCHCL |
reads (CON) |
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Data‑length is used by... |
To... |
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applications |
write |
Note: If the length of an element would exceed 65535 (32767 for PL/I), then the data may not be part of the element and Data‑pointer must be used to address the data.
Data‑pointer
Data‑pointer is a four-byte field into which the pointer to the data is placed. If either there is no data associated with this type or the data is included in the element, the field is zero or null.
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The variable name for Data‑pointer is... |
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In this language... |
Level 2 |
Level 1 |
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COBOL |
D8XCEDPT |
DBXCEDPT |
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PL/I |
D8XCEDPT |
DBXCEDPT |
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C |
d8xcedPt |
dbxcedPt |
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IBM Assembler |
D8XCEDPT |
DBXCEDPT |
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This routine... |
Does this for Data‑pointer. . .1 |
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DBCHINI |
– |
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DBCHCL |
reads (CON) |
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Data‑pointer is used by... |
To... |
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applications |
write |
Data‑type
Data‑type is a two-byte unsigned integer field into which the type of data is placed.
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The variable name for Data‑type is... |
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In this language... |
Level 2 |
Level 1 |
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COBOL |
D8XCEDTY |
DBXCEDTY |
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PL/I |
D8XCEDTY |
DBXCEDTY |
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C |
d8xcedTy |
dbxcedTy |
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IBM Assembler |
D8XCEDTY |
DBXCEDTY |
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This routine... |
Does this for Data‑type. . .1 |
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DBCHINI |
– |
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DBCHCL |
reads (CON) |
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Data‑type is used by... |
To... |
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applications |
write |
The following types are supported:
Element‑length
Element‑length is a two-byte unsigned integer field into which the length of the element is placed.
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The variable name for Element‑length is... |
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In this language... |
Level 2 |
Level 1 |
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COBOL |
D8XCLLEN |
DBXCLLEN |
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PL/I |
DB8XCLLEN |
DBXCLLEN |
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C |
d8xclLen |
dbxclLen |
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IBM Assembler |
D8XCLLEN |
DBXCLLEN |
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This routine... |
Does this for Element‑length. . .1 |
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DBCHINI |
– |
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DBCHCL |
reads (CON) |
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Element‑length is used by... |
To... |
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applications |
write |
Element‑type
Element‑type is a two-byte unsigned integer field into which the type of element is placed. Currently, there is only one type of element, a data element with a type of 0.
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The variable name for Element‑type is... |
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In this language... |
Level 2 |
Level 1 |
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COBOL |
D8XCLTYP |
DBXCLTYP |
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PL/I |
D8XCLTYP |
DBXCLTYP |
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C |
d8xclTyp |
dbxclTyp |
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IBM Assembler |
D8XCLTYP |
DBXCLTYP |
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This routine... |
Does this for Element‑type. . .1 |
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DBCHINI |
– |
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DBCHCL |
reads (CON) |
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Element‑type is used by... |
To... |
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applications |
write |
The mnemonic DBXCETD should be used to define a data element.
Eyecatcher
Eyecatcher is a four-byte field into which the EBCDIC characters 'CNX ' must be placed.
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The variable name for Eyecatcher is... |
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In this language... |
Level 2 |
Level 1 |
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COBOL |
D8XCID |
DBXCID |
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PL/I |
D8XCID |
DBXCID |
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C |
d8xcId |
dbxcId |
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IBM Assembler |
D8XCID |
DBXCID |
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This routine... |
Does this for Eyecatcher. . .1 |
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DBCHINI |
– |
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DBCHCL |
reads (CON) |
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Eyecatcher is used by... |
To... |
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applications |
write |
The mnemonic DBXCICNX contains 'CNX ' and should be used to initialize this field.
Length
Length is a four-byte unsigned integer field into which the total length of the extension is placed. The length includes the header fields, the fields of all elements, and any in-line data for the elements.
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The variable name for Length is... |
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In this language... |
Level 2 |
Level 1 |
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COBOL |
D8XCLEN |
DBXCLEN |
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PL/I |
D8XCLEN |
DBXCLEN |
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C |
d8xcLen |
dbxcLen |
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IBM Assembler |
D8XCLEN |
DBXCLEN |
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This routine... |
Does this for Length. . .1 |
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DBCHINI |
– |
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DBCHCL |
reads (CON) |
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Length is used by... |
To... |
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applications |
write |
Level
The Level field specifies the format of the extension. The current level is 2. New development should use only the level 2 form. The level 1 form is deprecated.
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The variable name for Level is... |
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In this language... |
Level 2 |
Level 1 |
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COBOL |
D8XCLVL |
DBXCLVL |
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PL/I |
D8XCLVL |
DBXCLVL |
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C |
d8xcLvl |
dbxcLvl |
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IBM Assembler |
D8XCLVL |
DBXCLVL |
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This routine... |
Does this for Level...1 |
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DBCHINI |
– |
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DBCHCL |
reads (CON) |
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Level is used by... |
To... |
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applications |
write |
The mnemonic DBXCLVLC should be used to initialize this field.
Next‑pointer
Next‑pointer is a four-byte field into which the pointer to the next Connect‑extension is placed. If another Connect‑extension does not exist, the field is zero or null.
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The variable name for Next‑pointer is... |
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In this language... |
Level 2 |
Level 1 |
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COBOL |
D4XCNEXT |
DBXCNEXT |
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PL/I |
D4XCNEXT |
DBXCNEXT |
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C |
d4xcNext |
dbxcNext |
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IBM Assembler |
D4XCNEXT |
DBXCNEXT |
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This routine... |
Does this for Next‑pointer...1 |
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DBCHINI |
– |
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DBCHCL |
reads (CON) |
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Next‑pointer is used by... |
To... |
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applications |
write |