157 lines
5.8 KiB
HTML
157 lines
5.8 KiB
HTML
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<a href="intro.html"><h2>Session Module C Interface</h2></a><h2>Load The Difference Between Tables Into A Session</h2><blockquote><pre>int sqlite3session_diff(
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sqlite3_session *pSession,
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const char *zFromDb,
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const char *zTbl,
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char **pzErrMsg
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);
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</pre></blockquote><p>
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If it is not already attached to the session object passed as the first
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argument, this function attaches table zTbl in the same manner as the
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<a href="../session/sqlite3session_attach.html">sqlite3session_attach()</a> function. If zTbl does not exist, or if it
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does not have a primary key, this function is a no-op (but does not return
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an error).</p>
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<p>Argument zFromDb must be the name of a database ("main", "temp" etc.)
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attached to the same database handle as the session object that contains
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a table compatible with the table attached to the session by this function.
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A table is considered compatible if it:</p>
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<p><ul>
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<li> Has the same name,
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<li> Has the same set of columns declared in the same order, and
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<li> Has the same PRIMARY KEY definition.
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</ul></p>
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<p>If the tables are not compatible, SQLITE_SCHEMA is returned. If the tables
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are compatible but do not have any PRIMARY KEY columns, it is not an error
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but no changes are added to the session object. As with other session
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APIs, tables without PRIMARY KEYs are simply ignored.</p>
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<p>This function adds a set of changes to the session object that could be
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used to update the table in database zFrom (call this the "from-table")
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so that its content is the same as the table attached to the session
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object (call this the "to-table"). Specifically:</p>
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<p><ul>
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<li> For each row (primary key) that exists in the to-table but not in
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the from-table, an INSERT record is added to the session object.</p>
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<p> <li> For each row (primary key) that exists in the to-table but not in
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the from-table, a DELETE record is added to the session object.</p>
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<p> <li> For each row (primary key) that exists in both tables, but features
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different non-PK values in each, an UPDATE record is added to the
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session.
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</ul></p>
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<p>To clarify, if this function is called and then a changeset constructed
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using <a href="../session/sqlite3session_changeset.html">sqlite3session_changeset()</a>, then after applying that changeset to
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database zFrom the contents of the two compatible tables would be
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identical.</p>
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<p>It an error if database zFrom does not exist or does not contain the
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required compatible table.</p>
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<p>If the operation is successful, SQLITE_OK is returned. Otherwise, an SQLite
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error code. In this case, if argument pzErrMsg is not NULL, *pzErrMsg
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may be set to point to a buffer containing an English language error
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message. It is the responsibility of the caller to free this buffer using
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sqlite3_free().
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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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