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Overview
| Comment: | More virtual table documentation tweaks. |
|---|---|
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
0d0a959a73ff9318347dfee347124886 |
| User & Date: | drh 2009-04-14 18:20:16 |
Context
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2009-04-15
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| 12:56 | Fix typos in the vtab.html document. check-in: e9e994caf8 user: drh tags: trunk | |
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2009-04-14
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| 18:20 | More virtual table documentation tweaks. check-in: 0d0a959a73 user: drh tags: trunk | |
| 18:15 | Update to the virtual table documentation - in particular the documentation on the xUpdate method. check-in: feccb40483 user: drh tags: trunk | |
Changes
Changes to pages/vtab.in.
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); </pre></blockquote> <p>All changes to a virtual table are made using the xUpdate method. This one method can be used to insert, delete, or update. <p>The argc parameter specifies the number of entries in the argv array. Every argv entry will have a non-NULL value in C but may contain the SQL value NULL. In other words, it is always true that <tt>argv[i]!=0</tt> for <b>i</b> between 0 and <tt>argc-1</tt>. However, it might be the case that <tt>sqlite3_value_type(argv[i])==SQLITE_NULL</tt>. <p>The argv[0] parameter is the [rowid] of a row in the virtual table to be deleted. If argv[0] is an SQL NULL, then no deletion occurs. |
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); </pre></blockquote> <p>All changes to a virtual table are made using the xUpdate method. This one method can be used to insert, delete, or update. <p>The argc parameter specifies the number of entries in the argv array. The value of argc will be 1 for a pure delete operation or N+2 for an insert or replace or update where N is the number of columns in the table. In the previous sentence, N includes any hidden columns. <p>Every argv entry will have a non-NULL value in C but may contain the SQL value NULL. In other words, it is always true that <tt>argv[i]!=0</tt> for <b>i</b> between 0 and <tt>argc-1</tt>. However, it might be the case that <tt>sqlite3_value_type(argv[i])==SQLITE_NULL</tt>. <p>The argv[0] parameter is the [rowid] of a row in the virtual table to be deleted. If argv[0] is an SQL NULL, then no deletion occurs. |