100 lines
7.5 KiB
HTML
100 lines
7.5 KiB
HTML
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<html lang="en-us" xml:lang="en-us">
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<meta name="DC.Title" content="Convert System/370 floating point and null fields" />
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<meta name="abstract" content="To copy floating point fields and null fields that are in a System/370 format to an iSeries format, use FMTOPT(*CVTFLOAT) for the floating point fields and FMTOPT(*NULLFLAGS) for the null fields. You can use these two values together in one command: FMTOPT(*CVTFLOAT *NULLFLAGS)." />
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<meta name="description" content="To copy floating point fields and null fields that are in a System/370 format to an iSeries format, use FMTOPT(*CVTFLOAT) for the floating point fields and FMTOPT(*NULLFLAGS) for the null fields. You can use these two values together in one command: FMTOPT(*CVTFLOAT *NULLFLAGS)." />
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<title>Convert System/370 floating
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point and null fields</title>
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</head>
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<body id="rbal3s370"><a name="rbal3s370"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Convert System/370 floating
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point and null fields</h1>
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<div><p>To copy floating point fields and null fields that are in a System/370™ format
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to an <span class="keyword">iSeries™</span> format, use FMTOPT(*CVTFLOAT)
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for the floating point fields and FMTOPT(*NULLFLAGS) for the null fields.
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You can use these two values together in one command: FMTOPT(*CVTFLOAT *NULLFLAGS).</p>
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<p>The FMTOPT(*CVTFLOAT) parameter on the CPYF command converts each floating
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point field from System/370 hexadecimal
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format to the IEEE format that is used by the <span class="keyword">iSeries</span>.
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The CPYF command converts those fields that are identified by the external
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description of the physical to-file.</p>
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<p>The FMTOPT(*NULLFLAGS) parameter on the CPYF command takes the byte (or
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flag) following each null-capable field and uses it to indicate if the corresponding
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input field is null. The CPYF command takes the fields that are identified
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as null-capable by the external description of the physical to-file. If the
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byte (or flag) is blank (<span>X'40'</span>) or contains <span>X'00'</span>, the data
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is considered not null. Any other value for the flag causes the corresponding
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input field data to be ignored and the output value set to null.</p>
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<p>If you use *CVTFLOAT or *NULLFLAGS and the input file is externally described,
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the input file's external description is not used in mapping the copied data.</p>
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<p>When you use *CVTFLOAT and *NULLFLAGS (together or independently), make
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certain that the to-file is an existing database, externally-described, physical
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data file.</p>
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<div class="p">You cannot specify the *CVTFLOAT and *NULLFLAGS values when any of the
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following conditions are true: <ul><li>You have specified RCDFMT(*ALL) for a multiple-format logical from-file</li>
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<li>You have specified any value other than the default for CRTFILE, and the
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to-file does not exist</li>
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<li>You have specified a value other than the default for the FROMKEY, TOKEY,
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INCCHAR, INCREL, SRCOPT, or SRCSEQ parameters.</li>
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</ul>
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</div>
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<p>When you specify either *CVTFLOAT or *NULLFLAGS, all other values for the
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FMTOPT parameter are ignored. If you use both *CVTFLOAT and *NULLFLAGS on
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one CPYF command, both values are recognized.</p>
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<p>When you specify the *CVTFLOAT value (and have not specified *NULLFLAGS),
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the expected from-file record length is the to-file record length. When you
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have specified the *NULLFLAGS value, the expected from-file record length
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is equal to the sum of the to-file record length and the number of null-capable
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fields in the to-file. The from-file's record length cannot be less than the
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expected length. If the from-file's record length is greater than the expected
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length, an inquiry message is sent to the QSYSOPR message queue to determine
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if the user wants to continue. If the user continues, the trailing data (fields)
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in the from-file is truncated in the to-file.</p>
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<p>The to-file must contain the correct result format description. The from-file
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data must be in the same corresponding position as the to-file data. Otherwise,
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output mapping errors or unpredictable results might occur. Date, time, and
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timestamp data must be in the external form of the to-file field specification.
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Numeric data types in the to-file must be large enough to contain the expected
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data. For example, decimal data types in the to-file must be created using
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the maximum possible precision for the byte length of the field to avoid the
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loss of any digits. Because there are no CCSID conversions, the to-file fields
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should be created with the expected CCSIDs.</p>
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<p>For more information about converting floating points and null fields,
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see <a href="rbal3errin.htm#rbal3errin">Errors in converting System/370 floating point and null fields</a>.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rbal3errin.htm">Errors in converting System/370 floating point and null fields</a></strong><br />
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Any conversion errors will cause CPF2958 messages to be issued for up to 10 records with errors. A CPF2959 message will be issued after the copy operation; this message indicates the number of records that caused an error if more than 10 records caused conversion errors.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbal3copydbmbrfmt.htm" title="When you copy from a database file to a database file, you must use the FMTOPT parameter if the record formats are not identical or if the files are different types (source or data). If either file is a device file or inline data file, the FMTOPT parameter does not apply. The records are truncated or padded with blanks or zeros when record lengths are different. A message is sent if the records are truncated.">Copying between different database record formats (FMTOPT parameter)</a></div>
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</div>
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</div>
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</body>
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