171 lines
6.9 KiB
HTML
171 lines
6.9 KiB
HTML
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<a href="intro.html"><h2>Session Module C Interface</h2></a><h2>Add A Changeset To A Changegroup</h2><blockquote><pre>int sqlite3changegroup_add(sqlite3_changegroup*, int nData, void *pData);
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</pre></blockquote><p>
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Add all changes within the changeset (or patchset) in buffer pData (size
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nData bytes) to the changegroup. </p>
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<p>If the buffer contains a patchset, then all prior calls to this function
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on the same changegroup object must also have specified patchsets. Or, if
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the buffer contains a changeset, so must have the earlier calls to this
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function. Otherwise, SQLITE_ERROR is returned and no changes are added
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to the changegroup.</p>
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<p>Rows within the changeset and changegroup are identified by the values in
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their PRIMARY KEY columns. A change in the changeset is considered to
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apply to the same row as a change already present in the changegroup if
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the two rows have the same primary key.</p>
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<p>Changes to rows that do not already appear in the changegroup are
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simply copied into it. Or, if both the new changeset and the changegroup
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contain changes that apply to a single row, the final contents of the
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changegroup depends on the type of each change, as follows:</p>
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<p><table border=1 style="margin-left:8ex;margin-right:8ex">
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<tr><th style="white-space:pre">Existing Change </th>
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<th style="white-space:pre">New Change </th>
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<th>Output Change
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<tr><td>INSERT <td>INSERT <td>
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The new change is ignored. This case does not occur if the new
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changeset was recorded immediately after the changesets already
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added to the changegroup.
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<tr><td>INSERT <td>UPDATE <td>
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The INSERT change remains in the changegroup. The values in the
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INSERT change are modified as if the row was inserted by the
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existing change and then updated according to the new change.
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<tr><td>INSERT <td>DELETE <td>
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The existing INSERT is removed from the changegroup. The DELETE is
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not added.
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<tr><td>UPDATE <td>INSERT <td>
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The new change is ignored. This case does not occur if the new
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changeset was recorded immediately after the changesets already
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added to the changegroup.
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<tr><td>UPDATE <td>UPDATE <td>
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The existing UPDATE remains within the changegroup. It is amended
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so that the accompanying values are as if the row was updated once
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by the existing change and then again by the new change.
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<tr><td>UPDATE <td>DELETE <td>
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The existing UPDATE is replaced by the new DELETE within the
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changegroup.
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<tr><td>DELETE <td>INSERT <td>
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If one or more of the column values in the row inserted by the
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new change differ from those in the row deleted by the existing
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change, the existing DELETE is replaced by an UPDATE within the
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changegroup. Otherwise, if the inserted row is exactly the same
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as the deleted row, the existing DELETE is simply discarded.
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<tr><td>DELETE <td>UPDATE <td>
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The new change is ignored. This case does not occur if the new
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changeset was recorded immediately after the changesets already
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added to the changegroup.
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<tr><td>DELETE <td>DELETE <td>
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The new change is ignored. This case does not occur if the new
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changeset was recorded immediately after the changesets already
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added to the changegroup.
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</table></p>
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<p>If the new changeset contains changes to a table that is already present
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in the changegroup, then the number of columns and the position of the
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primary key columns for the table must be consistent. If this is not the
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case, this function fails with SQLITE_SCHEMA. If the input changeset
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appears to be corrupt and the corruption is detected, SQLITE_CORRUPT is
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returned. Or, if an out-of-memory condition occurs during processing, this
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function returns SQLITE_NOMEM. In all cases, if an error occurs the state
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of the final contents of the changegroup is undefined.</p>
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<p>If no error occurs, SQLITE_OK is returned.
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</p><p>See also lists of
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<a href="objlist.html">Objects</a>,
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<a href="constlist.html">Constants</a>, and
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<a href="funclist.html">Functions</a>.</p>
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