KeyEQ (Dataset function): Difference between revisions
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{{Template:Dataset:KeyEQ subtitle}} | {{Template:Dataset:KeyEQ subtitle}} | ||
<var>KeyEQ</var> returns a <var>[[Boolean enumeration]]</var> to indicate whether the specified <var>key</var> was found within the <var>Dataset</var> object. If true, the object is positioned to that record | <var>KeyEQ</var> returns a <var>[[Boolean enumeration]]</var> to indicate whether the specified <var>key</var> was found within the <var>Dataset</var> object. If true, the object is positioned to that record. A subsequent read of the <var>Dataset</var> object will return the specified record. | ||
==Syntax== | ==Syntax== | ||
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Setting the value to nulls will cause reads to begin from the first record.</li>. | Setting the value to nulls will cause reads to begin from the first record.</li>. | ||
</ul> | </ul> | ||
==Examples== | ==Examples== | ||
ALLOCATE DATASET VSAMALT WITH SCOPE=SYSTEM DSN=RDP.VSAM.AIX - | ALLOCATE DATASET VSAMALT WITH SCOPE=SYSTEM DSN=RDP.VSAM.AIX - | ||
Revision as of 16:43, 14 April 2021
Template:Dataset:KeyEQ subtitle
KeyEQ returns a Boolean enumeration to indicate whether the specified key was found within the Dataset object. If true, the object is positioned to that record. A subsequent read of the Dataset object will return the specified record.
Syntax
Syntax
Template loop detected: Template:Dataset:KeyEQ syntax
Syntax terms
| %boolean | A Boolean enumeration value |
|---|---|
| key | A key object. |
Syntax terms
| %boolean | An enumeration object of type Boolean to contain the result of the positioning of the dataset object to key key . KeyEQ returns True if the specified key is found; otherwise it returns False.
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|---|---|
| Key | The value used to position the Dataset object. |
Usage notes
- The default for Key is nulls. Setting the value to nulls will cause reads to begin from the first record. .
Examples
ALLOCATE DATASET VSAMALT WITH SCOPE=SYSTEM DSN=RDP.VSAM.AIX - VSAM KEYED OLD SHARE ALLOCATE DATASET VSAMDS WITH SCOPE=SYSTEM DSN=RDP.VSAM - VSAM KEYED OLD SHARE Begin %l is longstring %ds is object dataset %ds = new('VSAMALT') if %ds:open then print "Error opening dataset" stop end if %key is string len 4 initial('AAAA') print %ds:keyeq(%key) %l = %ds:readRecord %ds:close %ds = new('VSAMDS') if %ds:open then print "Error opening dataset" stop end if print %ds:keyge(%l:Substring(10,8)) repeat forever %l = %ds:readRecord if %ds:state eq afterEnd then print 'end of rec' loop end end if print %l end repeat %ds:close End FREE VSAMALT FREE VSAMDS