The number of SQLVAR occurrences needed depends on the statement that the SQLDA was provided for and the data types of the columns or parameters being described. See the tables above for more information.
The 7th byte of SQLDAID is always set to the number of sets of SQLVARs necessary.
If SQLD is not set to a sufficient number of SQLVAR occurrences:
Table 94, Table 95, and Table 96 show how to map the base and extended SQLVAR entries. For an SQLDA that contains both base and extended SQLVAR entries, the base SQLVAR entries are in the first block, followed by a block of extended SQLVAR entries, which if necessary, are followed by a second or third block of extended SQLVAR entries. In each block, the number of occurrences of the SQLVAR entry is equal to the value in SQLD even though many of the extended SQLVAR entries might be unused.
LOBs | DISTINCT types | 7th byte of SQLDAID | SQLN Minimum | First Set (Base) | Second Set (Extended) | Third Set (Extended) | Fourth Set (Extended) |
---|---|---|---|---|---|---|---|
No | No | Blank | n | Column names, system column names, or labels | Not used | Not used | Not used |
Yes | No | 2 | 2n | Column names, system column names, or labels | LOBs | Not used | Not used |
No | Yes | 2 | 2n | Column names, system column names, or labels | Distinct types | Not used | Not used |
Yes | Yes | 2 | 2n | Column names, system column names, or labels | LOBs and distinct types | Not used | Not used |
LOBs | DISTINCT types | 7th byte of SQLDAID | SQLN Minimum | First Set (Base) | Second Set (Extended) | Third Set (Extended) | Fourth Set (Extended) |
---|---|---|---|---|---|---|---|
No | No | 2 | 2n | Column names | Labels | Not used | Not used |
Yes | No | 2 | 2n | Column names | LOBs and labels | Not used | Not used |
No | Yes | 3 | 3n | Column names | Distinct types | Labels | Not used |
Yes | Yes | 3 | 3n | Column names | LOBs and distinct types | Labels | Not used |
LOBs | DISTINCT types | 7th byte of SQLDAID | SQLN Minimum | First Set (Base) | Second Set (Extended) | Third Set (Extended) | Fourth Set (Extended) |
---|---|---|---|---|---|---|---|
No | No | 3 | 3n | System column names | Labels | Column names | Not used |
Yes | No | 3 | 3n | System column names | LOBs and labels | Column names | Not used |
No | Yes | 4 | 4n | System column names | Distinct types | Labels | Column names |
Yes | Yes | 4 | 4n | System column names | LOBs and distinct types | Labels | Column names |
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