150 lines
5.2 KiB
HTML
150 lines
5.2 KiB
HTML
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antiRobotDefense();
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</script>
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<a href="../session/intro.html"><h2>Session Module C Interface</h2></a><h2>Add a Schema to a Changegroup</h2><blockquote><pre>int sqlite3changegroup_schema(sqlite3_changegroup*, sqlite3*, const char *zDb);
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</pre></blockquote><p>
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This method may be used to optionally enforce the rule that the changesets
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added to the changegroup handle must match the schema of database zDb
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("main", "temp", or the name of an attached database). If
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sqlite3changegroup_add() is called to add a changeset that is not compatible
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with the configured schema, SQLITE_SCHEMA is returned and the changegroup
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object is left in an undefined state.</p>
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<p>A changeset schema is considered compatible with the database schema in
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the same way as for sqlite3changeset_apply(). Specifically, for each
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table in the changeset, there exists a database table with:</p>
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<p><ul>
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<li> The name identified by the changeset, and
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<li> at least as many columns as recorded in the changeset, and
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<li> the primary key columns in the same position as recorded in
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the changeset.
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</ul></p>
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<p>The output of the changegroup object always has the same schema as the
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database nominated using this function. In cases where changesets passed
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to sqlite3changegroup_add() have fewer columns than the corresponding table
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in the database schema, these are filled in using the default column
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values from the database schema. This makes it possible to combined
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changesets that have different numbers of columns for a single table
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within a changegroup, provided that they are otherwise compatible.
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</p><p>See also lists of
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<a href="../session/objlist.html">Objects</a>,
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<a href="../session/constlist.html">Constants</a>, and
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<a href="../session/funclist.html">Functions</a>.</p>
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