155 lines
5.7 KiB
HTML
155 lines
5.7 KiB
HTML
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<a href="intro.html"><h2>Session Module C Interface</h2></a><h2>Constants Passed To The Conflict Handler</h2><blockquote><pre>#define SQLITE_CHANGESET_DATA 1
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#define SQLITE_CHANGESET_NOTFOUND 2
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#define SQLITE_CHANGESET_CONFLICT 3
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#define SQLITE_CHANGESET_CONSTRAINT 4
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#define SQLITE_CHANGESET_FOREIGN_KEY 5
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</pre></blockquote><p>
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Values that may be passed as the second argument to a conflict-handler.</p>
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<p><dl>
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<dt>SQLITE_CHANGESET_DATA<dd>
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The conflict handler is invoked with CHANGESET_DATA as the second argument
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when processing a DELETE or UPDATE change if a row with the required
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PRIMARY KEY fields is present in the database, but one or more other
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(non primary-key) fields modified by the update do not contain the
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expected "before" values.</p>
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<p> The conflicting row, in this case, is the database row with the matching
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primary key.</p>
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<p><dt>SQLITE_CHANGESET_NOTFOUND<dd>
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The conflict handler is invoked with CHANGESET_NOTFOUND as the second
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argument when processing a DELETE or UPDATE change if a row with the
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required PRIMARY KEY fields is not present in the database.</p>
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<p> There is no conflicting row in this case. The results of invoking the
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sqlite3changeset_conflict() API are undefined.</p>
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<p><dt>SQLITE_CHANGESET_CONFLICT<dd>
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CHANGESET_CONFLICT is passed as the second argument to the conflict
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handler while processing an INSERT change if the operation would result
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in duplicate primary key values.</p>
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<p> The conflicting row in this case is the database row with the matching
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primary key.</p>
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<p><dt>SQLITE_CHANGESET_FOREIGN_KEY<dd>
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If foreign key handling is enabled, and applying a changeset leaves the
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database in a state containing foreign key violations, the conflict
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handler is invoked with CHANGESET_FOREIGN_KEY as the second argument
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exactly once before the changeset is committed. If the conflict handler
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returns CHANGESET_OMIT, the changes, including those that caused the
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foreign key constraint violation, are committed. Or, if it returns
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CHANGESET_ABORT, the changeset is rolled back.</p>
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<p> No current or conflicting row information is provided. The only function
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it is possible to call on the supplied sqlite3_changeset_iter handle
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is sqlite3changeset_fk_conflicts().</p>
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<p><dt>SQLITE_CHANGESET_CONSTRAINT<dd>
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If any other constraint violation occurs while applying a change (i.e.
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a UNIQUE, CHECK or NOT NULL constraint), the conflict handler is
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invoked with CHANGESET_CONSTRAINT as the second argument.</p>
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<p> There is no conflicting row in this case. The results of invoking the
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sqlite3changeset_conflict() API are undefined.</p>
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<p></dl>
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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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